tfhjj636
- Создано: 18-03-22
- Последний вход: 18-03-22
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A grinding wheel is a wheel used
Описание: A grinding wheel is a wheel used for grinding. Grinding wheels are composed of abrasive compounds and are used for various grinding (abrasive cutting) and abrasive machining operations. Such wheels are used in grinding machines. The wheels are generally made with composite material . This consists of coarse-particle aggregate pressed and bonded together by a cementing matrix (called the bond in grinding wheel terminology) to form a solid, circular shape. Various profiles and cross sections are available depending on the intended usage for the wheel. They may also be made from a solid steel or aluminium disc with particles bonded to the surface. Today most grinding wheels are artificial composites made with artificial aggregates, but the history of grinding wheels began with natural composite stones, such as those used for millstones. The manufacture of these wheels is a precise and tightly controlled process, due not only to the inherent safety risks of a spinning disc, but also the composition and uniformity required to prevent that disc from exploding due to the high stresses produced on rotation. Grinding wheels are consumables, although the life span can vary widely depending on the use case, from less than a day to many years. As the wheel cuts, it periodically releases individual grains of abrasive, typically because they grow dull and the increased drag pulls them out of the bond. Fresh grains are exposed in this wear process, which begin the next cycle. The rate of wear in this process is usually very predictable for a given application, and is necessary for good performance. Drills are cutting tools used to remove material to create holes, almost always of circular cross-section. Drills come in many sizes and shapes and can create different kinds of holes in many different materials. In order to create holes drill bits are usually attached to a drill, which powers them to cut through the workpiece, typically by rotation. The drill will grasp the upper end of a bit called the shank in the chuck. Drills come in standardized drill bit sizes. A comprehensive drill bit and tap size chart lists metric and imperial sized drills alongside the required screw tap sizes. There are also certain specialized drill bits that can create holes with a non-circular cross-section. Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types of shank used include hex-shaped, and various proprietary quick release systems. The diameter-to-length ratio of the drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g., "aircraft-length" twist bits, pressured-oil gun drill bits, etc.), but the higher the ratio, the greater the technical challenge of producing good work. The best geometry to use depends upon the properties of the material being drilled. Grinding is a mechanical method of removing material, refers to the processing method of removing excess material on the workpiece with abrasives and abrasive tools. Grinding is one of the most widely used material removal methods. Grinding processing belongs to finishing processing in mechanical processing (machining is divided into roughing, finishing, heat treatment and other processing methods), with less processing volume and high precision. It is widely used in the machinery manufacturing industry. Carbon tool steel and carburizing and quenching steel parts that have been heat treated and quenched often have a large number of regularly arranged cracks on the surface that is basically perpendicular to the grinding direction during grinding-grinding cracks , it not only affects the appearance of the part, but also directly affects the quality of the part. Grinding, according to different process purposes and requirements, there are various forms of processing methods. In order to meet the needs of development, grinding technology is developing towards precision, low roughness, high efficiency, high speed and automatic grinding. There are many forms of grinding processing methods. In production, grinding mainly refers to grinding with grinding wheels. In order to facilitate use and management, grinding processing methods are usually divided into four methods according to the grinding processing form and processing objects of grinding machine products: 1. According to the grinding accuracy, it is divided into rough grinding, semi-finishing, fine grinding, mirror grinding and super-finishing. 2. According to the feed form, it is divided into plunge grinding, longitudinal grinding, slow feed grinding, no-feed grinding, constant pressure grinding, and quantitative grinding. 3. According to the grinding form, it can be divided into belt grinding, centerless grinding, face grinding, peripheral grinding, wide grinding wheel grinding, forming grinding, profiling grinding, oscillation grinding, high-speed grinding, strong grinding, Constant pressure grinding, manual grinding, dry grinding, wet grinding, grinding, honing, etc. 4. According to the machined surface, it is divided into cylindrical grinding, internal grinding, surface grinding and sharpening (gear grinding and thread grinding) In addition, there are many ways to distinguish, for example, according to the type of grinding tools used in grinding: the grinding method of fixed abrasive abrasives and the grinding method of free abrasives. The grinding methods of abrasive abrasive tools mainly include grinding wheel grinding, honing, abrasive belt grinding, electrolytic grinding, etc.; the processing methods of free abrasive grinding mainly include grinding, polishing, jet machining, abrasive flow machining, vibration machining Etc. According to the level of the grinding wheel linear speed Vs, it is divided into: ordinary grinding Vs
Дата Публикации: 18-03-22
Table game has two senses
Описание: Table game has two senses. In a general sense it is any "game played on a table or similar surface, typically with counters, balls, or other playing pieces" as opposed to card games and, sometimes, board games. In the United States, 'table game' is the term used for games of chance such as blackjack, craps, roulette and baccarat that are played against the casino and operated by one or more live croupiers, as opposed to those played on a mechanical device like a slot machine or against other players instead of the casino, such as standard poker. Whichever meaning is used, it should not be confused with tables games which are a family of board games that include backgammon. Sports table games are sports that are played on a tabletop. Unlike tabletop games, sports table games require physical dexterity. Included football table games, pool table games, button football, table tennis game, headis, cue sports, air hockey games, and table basketball games, etc. They are usually played indoors. Party drinking games are quick mood-boosting games that promote communication, includes novelty drinking games, wooden shot glass server with 6 glasses, 12cups 12balls beer pong game, beer pong set drinking game party cups, drinking decision maker drinking game for adult party, shot glass roulette, roulette shots game, fire extinguisher beer dispenser, ice cubes, large bingo set, dart, etc. Gamling game set includes poker chip set, the following are its features: (1) PERFECT POKER CHIPS - This poker set is made of top quality materials with a iron insert for a better feel and longer lasting use.Each chip weighs 11.5 grams, the same weight and feel as professional casino-grade chips; (2) DURABLE ALUMINUM CASE - The case is well made of aluminum, lightweight and durable.The aluminum case is easy to carry and convenient for poker chips storage. Included tray inserts keeping each piece in place, and foam inserts to protect poker chips from damage; (3) SUITABLE FOR ALL AGES - Classic poker chip set is an excellent gift choice for people of all ages, which can make the party lively and provide entertainment for your family and friends. Ideal for Texas Holdem, blackjack, tournaments, card clubs or late night poker games; (4) PERFECT POKER CHIP SET FOR BEGINNERS - 100PCS blank chips set is our lowest priced set for people who are budget conscious and do not know whether they want to play poker for a long period of time. It is a good low priced set to begin with. Board games are tabletop games that typically use pieces moved or placed on a pre-marked board (playing surface) and often include elements of table, card, role-playing, and miniatures games as well. Most feature a competition between two or more players. In checkers, a player wins by capturing all opposing pieces, while Eurogames often end with a calculation of final scores. Pandemic is a cooperative game where players all win or lose as a team, and peg solitaire is a puzzle for one person. There are many varieties of board games. Their representation of real-life situations can range from having no inherent theme, such as checkers, to having a specific theme and narrative, such as Cluedo. Rules can range from the very simple, such as in Snakes and Ladders; to deeply complex, as in Advanced Squad Leader. The time required to learn to play or master a game varies greatly from game to game, but is not necessarily correlated with the number or complexity of rules; games like chess or Go possess relatively simple rulesets, but have great strategic depth. The Classic Games Glass Chess Set features a glass chessboard with alternating clear glass and frosted glass squares, as well as clear glass and frosted glass chess pieces. This effect gives one set of chess pieces a glossy, smooth look while the other looks and feels more matte. Chess drinking game consists of a lovely, shiny chessboard with small shot glasses with pictures of the different chess pieces on them. Fill the glasses with your drink of choice before you get started. The more important the piece, the bigger the contents. A beer belt consists of six plastic beverage holders threaded through a nylon belt. The beer belt wearer loads canned or bottled beer into the holders and snaps the adjustable belt around his or her waist. A hops holster may also be slung around the wearer's shoulder for a different effect. Sometimes servers in a bar will serve customers beers pulled from a beer belt or hops holster. The beer belt is an ideal solution for tailgate parties, since it leaves both hands free for other activities. Party-goers and sports fans can load up from a cooler and reload if necessary. The empty cans or bottles can be placed back into the beer belt for easy disposal or recycling. Although considered a novelty or gag gift by some, a basic beer belt can often be purchased at larger beverage stores or through online specialty stores. Some may also be customized with a beer company's logo or a sports team's official colors. A standard beer belt generally retails for $15-$20 US Dollars, although more advanced models with insulated holders can sell for much more. Because the basic elements, a nylon belt and portable cup holders, can be purchased separately, an enterprising beverage drinker might be able to create a homemade beer belt with a few modifications. There are a raft of funny gifts for you and your friends, such as plastic pin art toy, Toilet Shooting Shooter Game, Mini Soccer Set toilet game, table bell amazon, newton balance ball, basketball games and other sports games. Outdoor games are games (events of one or more person where there is a objective and the possibility of success and failure) played by using all your limbs for sustained periods of time, in the mythical land of "outside", like best bean bag toss game, a lawn game in which players take turns throwing 16 ounce fabric bean bags at a raised platform (board) with a hole in the far end. A bag in the hole scores 3 points, while one on the board scores 1 point.
Дата Публикации: 18-03-22
In electronics, a remote control
Описание: In electronics, a remote control (also known as a remote or clicker) is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as a television set, DVD player or other home appliance. A remote control can allow operation of devices that are out of convenient reach for direct operation of controls. They function best when used from a short distance. This is primarily a convenience feature for the user. In some cases, remote controls allow a person to operate a device that they otherwise would not be able to reach, as when a garage door opener is triggered from outside. Early television remote controls (1956–1977) used ultrasonic tones. Present-day remote controls are commonly consumer infrared devices which send digitally-coded pulses of infrared radiation. They control functions such as power, volume, channels, playback, track change, heat, fan speed, and various other features. Remote controls for these devices are usually small wireless handheld objects with an array of buttons. They are used to adjust various settings such as television channel, track number, and volume. The remote control code, and thus the required remote control device, is usually specific to a product line. However, there are universal remotes, which emulate the remote control made for most major brand devices. A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint. Thermostats are used in any device or system that heats or cools to a setpoint temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States. A thermostat operates as a "closed loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in an automotive thermostat. The word thermostat is derived from the Greek words θερμ?? thermos, "hot" and στατ?? statos, "standing, stationary". In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching current can pass between them, while when the contacts are separated no current can flow. Switches are made in many different configurations; they may have multiple sets of contacts controlled by the same knob or actuator, and the contacts may operate simultaneously, sequentially, or alternately. A switch may be operated manually, for example, a light switch or a keyboard button, or may function as a sensing element to sense the position of a machine part, liquid level, pressure, or temperature, such as a thermostat. Many specialized forms exist, such as the toggle switch, rotary switch, mercury switch, push-button switch, reversing switch, relay, and circuit breaker. A common use is control of lighting, where multiple switches may be wired into one circuit to allow convenient control of light fixtures. Switches in high-powered circuits must have special construction to prevent destructive arcing when they are opened. Security cameras, also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. Even though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. (Videotelephony is seldom called "CCTV". Surveillance of the public using CCTV is common in many areas around the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras located on a police officer's chest or head. Video surveillance has generated significant debate about balancing its use with individuals' right to privacy even when in public. The names of circuit boards are: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board Thin circuit boards, printed (copper etching technology) circuit boards, etc. The circuit board makes the circuit miniaturized and intuitive, and plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances. The circuit board can be called Printed Circuit Board PCB, Flexible Printed Circuit board FPC circuit board (FPC circuit board, also known as flexible circuit board Flexible circuit board is a kind of high reliability made of polyimide or polyester film as the base material. It is an excellent flexible printed circuit board. It has the characteristics of high wiring density, light weight, thin thickness and good bendability.) and reechas, the birth and development of Soft and hard combination plate-FPC and PCB, gave birth to The new product of rigid-flex board. Therefore, the flexible and rigid board is a flexible circuit board and a rigid circuit board, which are combined according to the relevant process requirements after pressing and other processes to form a circuit board with FPC characteristics and PCB characteristics. It has a variety of types, such as dehumidifier circuit boards, thermostat circuit boards, water treatment circuit boards, security camera circuit boards, steam oven circuit boards, vacuum cleaner circuit boards, etc.
Дата Публикации: 18-03-22
Knife sharpening is the process
Описание: Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop, or strop, is often used to straighten and polish an edge. The smaller the angle between the blade and stone, the sharper the knife will be, but the less side force is needed to bend the edge over or chip it off. The angle between the blade and the stone is the edge angle – the angle from the vertical to one of the knife edges, and equals the angle at which the blade is held. The total angle from one side to the other is called the included angle – on a symmetric double-ground edge (a wedge shape), the angle from one edge to the other is thus twice the edge angle. Typical edge angles are about 20° (making the included angle 40° on a double-ground edge). The edge angle for very sharp knives can be as little as 10 degrees (for a 20° included angle). Knives that require a tough edge (such as those that chop) may sharpen at 25° or more. Different knives are sharpened differently according to grind (edge geometry) and application. For example, surgical scalpels are extremely sharp but fragile, and are generally disposed of, rather than sharpened, after use. Straight razors used for shaving must cut with minimal pressure, and thus must be very sharp with a small angle and often a hollow grind. Typically these are stropped daily or more often. Kitchen knives are less sharp, and generally cut by slicing rather than just pressing, and are steeled daily. At the other extreme, an axe for chopping wood will be less sharp still, and is primarily used to split wood by chopping, not by slicing, and may be reground but will not be sharpened daily. In general, but not always, the harder the material to be cut, the higher (duller) the angle of the edge. It can also be divided into diamond knife sharpener, ceramic knife sharpener and carbide knife sharpener according to the material. Manual knife sharpeners that are considered to be countertop utensils are also available that are more detailed than the Sharpening Steels. Tools that are built with grinding devices built into plastic or metal cases are often small in size but able to simplify the sharpening activities considerably. Often, the Knife Sharpener will contain a diamond coated abrasive or a tungsten carbide grinding stone for sharpening. A knife is drawn light through the grinding stone at an angle that is preset with the use of guides that keep the knife angle fairly consistent as it is drawn across the sharpening stone. Four to six draws of the blade is usually sufficient to keep the blade well honed. A guard is commonly attached to the sharpener so hands are kept safetly away from the knife blades. Electric knife sharpeners are another alternative for shapening knifes and are a type of utensil that often simplifies the sharpening process, particularly if the knives are being used frequently for various food cutting activities. Electric sharpeners are designed with basic features for home or moderate use as well as sharpeners built for higher volume usage, such as commercial sharpeners. When selecting consider the size desired, the type of grinding material on the stones, the types of blades that can be sharpened with the device, the safety features, and the ease of cleaning to remove small bits of edge grindings. Lower priced models will contain only one sharpening slot that offer single sharpening features while other models will have sharpening sections for different purposes such as pre-sharpening to remove burrs and old edges before placing the knife in the sharpening or honing section to finish the process. If a knife is to be used only periodically with a minimal amount of cutting, select the lower priced models. However, if the slicing, dicing and cutting chores are frequent, the higher priced or more heavy duty models may be a much better option for keeping all types of knives well sharpened. And there are also scissor knife sharpener and pocket knife sharpener. The pocket knife sharpener is a compact, packable knife sharpener designed for sharpening on the go. The diamond sharpening plate and ceramic honing rod use built-in angle guides to create a sharp edge anytime, anywhere. A honing steel, sometimes referred to as sharpening steel, whet steel, sharpening stick, sharpening rod, butcher's steel, and chef's steel, is a steel rod, ceramic sharpening rod, or diamond sharpening rod used to restore the sharpness of dulled edges. They are flat, oval, or round in cross-section and up to 30 centimetres (1 ft) long. The steel and ceramic honing steels may have longitudinal ridges, whereas the diamond-coated steels are smooth but embedded with abrasive diamond particles. Non-abrasive honing rods such as smooth ceramic or ribbed steel are able to remove small amounts of metal via adhesive wear. In normal use, the rod is applied to the blade at a slightly higher angle than that of the bevel, resulting in the formation of a micro-bevel. Sharpening stones, or whetstones, are used to sharpen the edges of steel tools and implements, such as knives, scissors, scythes, razors, chisels, hand scrapers, and plane blades, through grinding and honing. Such stones come in a wide range of shapes, sizes, and material compositions. They may be flat, for working flat edges, or shaped for more complex edges, such as those associated with some wood carving or woodturning tools. They may be composed of natural quarried material or from man-made material. They come in various grades, which refer to the grit size of the abrasive particles in the stone. (Grit size is given as a number, which indicates the spatial density of the particles; a higher number denotes a higher density and therefore smaller particles, which give a finer finish to the surface of the sharpened object.) Stones intended for use on a workbench are called bench stones, while small, portable ones, whose size makes it hard to draw large blades uniformly over them, especially “in the field,” are called pocket stones. It can be divided into diamond sharpening stone, ceramic sharpening stone and flattening stone, etc. Also, there are a raft of sharpening accessories, such as knife sharpening guide, sharpening oil and head of electric knife sharpener.
Дата Публикации: 18-03-22
An herb grinder (or simply, a grinder)
Описание: An herb grinder (or simply, a grinder) is a cylindrical device with two halves (top and bottom) that separate and have sharp teeth or pegs aligned in such a way that when both halves are turned, material inside is shredded. Though the manufacturers claim they are intended for use with herbs and spices for cooking, they are often used to shred cannabis, and are often unsuitable for actual use with spices (which instead are prepared using a burr grinder), resulting in a product that can be more easily hand-rolled into a "joint" that burns more evenly. Herb grinders are typically made of either metal or plastic and come in a variety of colors and polished metals. Some grinders have two or three compartments instead of just one, with fine screens separating the bottom compartments from the ones above, thus allowing the marijuana trichomes, also called kief, to be collected separately. The widespread adoption of cannabis as a recreational drug in recent times has caused herb grinders to become synonymous with weed grinders. There are many types of herb grinders out there, from electric to hand cranked, in various styles. Advertisements describing them as "spice grinders" have sometimes confused buyers who were unaware about the actual intended use. It can be made of different materials, such as aluminum alloy herb grinder, zinc alloy herb grinder, plastic herb grinder and wood herb grinder. A smoking pipe, often called simply a pipe, is a device specifically made to smoke tobacco. It comprises a chamber (the bowl) for the tobacco from which a thin hollow stem (shank) emerges, ending in a mouthpiece. Pipes can range from very simple machine-made briar models to highly prized hand-made artisanal implements made by renowned pipemakers, which are often very expensive collector's items. Pipe smoking is the oldest known traditional form of tobacco smoking. Some cultures of the indigenous peoples of the Americas smoke tobacco in ceremonial pipes, and have done so since long before the arrival of Europeans. For instance the Lakota people use a ceremonial pipe called ?ha?nú?pa. Other cultures of the indigenous peoples of the Americas smoke tobacco socially. The tobacco plant is native to South America but spread into North America long before Europeans arrived. Tobacco was introduced to Europe from the Americas in the 16th century and spread around the world rapidly. As tobacco was not introduced to the Old World until the 16th century, the older pipes outside of the Americas were usually used to smoke various other substances, including hashish, a rare and expensive substance outside areas of the Middle East, Central Asia and India, where it was then produced. A pipe's fundamental function is to provide a relatively safe, manipulable volume in which to incompletely combust a smokable substance. Typically this is accomplished by connecting a refractory 'bowl' to some sort of 'stem' which extends and may also cool the smoke mixture drawn through the combusting organic mass. The bowls of tobacco pipes are commonly made of briar wood, meerschaum, corncob, pear-wood, rose-wood or clay. Less common materials include other dense-grained woods such as cherry, olive, maple, mesquite, oak, and bog-wood. Minerals such as catlinite and soapstone have also been used. Pipe bowls are sometimes decorated by carving, and moulded clay pipes often had simple decoration in the mould. Unusual pipe materials include gourds (as in the famous calabash pipe) and pyrolytic graphite. Metal and glass, seldom used for tobacco pipes, are common for pipes intended for other substances, such as cannabis. Common pipes include metal smoking pipe and silicon smoking pipe. A rolling tray is a flat surface specifically designed to aid users in rolling joints, blunts, or spliffs. As someone who takes pride in rolling the best wraps for yourself or friends, having a rolling tray is definitely one way you can up your game. Rolling trays are designed to help you keep all of your items in one place while you roll, to offer a flat surface for your rolling activities. It's also great at catching anything that may fall during the process. Additionally, they can be placed in your lap, which makes it easier to roll. When you’re all finished rolling, you have a convenient storage area for all of your materials. These are designed to streamline the process of rolling your joints and blunts. Some people may roll directly over their counters, plates, or coffee tables. This can be a messy process that leaves extra weed scattered and tools susceptible to falling down on the ground and getting ruined or crushed. Hookahs are water pipes that are used to smoke specially made tobacco that comes in different flavors, such as apple, mint, cherry, chocolate, coconut, licorice, cappuccino, and watermelon. Although many users think it is less harmful, hookah smoking has many of the same health risks as cigarette smoking. Hookah is also called narghile, argileh, shisha, hubble-bubble, and goza. Hookahs vary in size, shape, and style. A typical modern hookah has a head (with holes in the bottom), a metal body, a water bowl, and a flexible hose with a mouthpiece. Hookah smoking is typically done in groups, with the same mouthpiece passed from person to person. Although many users think it is less harmful, studies have shown that hookah smoke contains many of the same harmful components found in cigarette smoke, such as nicotine, tar, and heavy metals. Water pipe smoking delivers nicotine—the same highly addictive drug found in other tobacco products. The tobacco in hookahs is exposed to high heat from burning charcoal, and the smoke is at least as toxic as cigarette smoke. The heat sources used to burn hookah tobacco release other dangerous substances, like carbon monoxide. This may put hookah users at additional risk. And because of the way a hookah is used, people who smoke hookah may absorb more of the toxic substances also found in cigarette smoke than people who smoke cigarettes do. There are several unique ways in which you can store your herbs. Silicone storage containers are becoming increasingly popular. They’re ideal for storing sticky substances since they resist the sticky nature of whatever you place in the container. This type of herb storage jar is also shatterproof, safe for the dishwasher, and can be frozen. A smoking companion set or smoking set, is an object both decorative and useful. It has compartments for cigars, cigarettes, matches, ashtrays and burned matches. They were popular in Europe circa 1900. A cigarette case (sometimes called a cigarette tin) is a sturdy container used to store small numbers of cigarettes and prevent them from being crushed. A typical cigarette case is a flat box (commonly made of metal) that opens symmetrically into two halves. Each half stores a row of cigarettes, which are often held in place by a spring or an elastic strap. Some cigarette cases are simply sturdy cases used to store standard cigarette packs.
Дата Публикации: 18-03-22
A face mask is a kind of hygiene
Описание: A face mask is a kind of hygiene product, which is generally worn on the mouth and nose to filter the air entering the mouth and nose to block harmful gases, odors, droplets, viruses and other substances. It is made of gauze or paper and other materials. Face Masks have a certain filtering effect on the air entering the lungs. Wearing masks has a very good effect when working in a polluted environment such as dust when respiratory infectious diseases are prevalent. Masks can be divided into air filter masks and air supply masks. The dust blocking efficiency of the mask is based on its blocking efficiency against fine dust, especially respiratory dust below 2.5 microns. Because dust of this particle size can directly enter the alveoli, it has the greatest impact on human health. The dust blocking principle of gauze masks is mechanical filtration, that is, when the dust collides with the gauze, some large particles of dust are blocked in the sand cloth through layers of barriers. For some fine dust, especially dust smaller than 2.5 microns, it will pass through the mesh of the gauze and enter the respiratory system. Dust masks are composed of activated carbon fiber felt pads or non-woven fabrics, and those respirable dust smaller than 2.5 microns are blocked in the process of passing through this filter material, which plays the role of filtering air. A raincoat is a waterproof or water-resistant suit worn to protect the body from rain. In most fashion markets including America, France, and Asia, a raincoat refers to both the top and bottom including trousers. The term rain jacket is sometimes used to refer to raincoats that are waist length. A rain jacket may be combined with a pair of rain pants to make rain clothing. Rain clothing may also be in one piece, like a boilersuit. Modern raincoats are often constructed from waterproof fabrics that are breathable, such as Gore-Tex or Tyvek and coated nylons. These fabrics allow water vapour to pass through, allowing the garment to 'breathe' so that the sweat of the wearer can escape. The amount of pouring rain a raincoat can handle is sometimes measured in the unit millimetres, water gauge. For the production of raincoats, the common raincoat sewing technology on the market is to use overlock, which is less comfortable to wear and cannot completely prevent the infiltration of rainwater. Therefore, computer high-pressure PU heat-sealing treatment technology can be used to widen the heat-sealing belt, which can effectively prevent rainwater from infiltrating from the pinhole seam and enhance the rain-shielding effect of the raincoat. Bedding, also known as bedclothes or bed linen, is the materials laid above the mattress of a bed for hygiene, warmth, protection of the mattress, and decorative effect. Bedding is the removable and washable portion of a human sleeping environment. Multiple sets of bedding for each bed are often washed in rotation and/or changed seasonally to improve sleep comfort at varying room temperatures. Most standardized measurements for bedding are rectangular, but there are also some square-shaped sizes, which allows the user to put on bedding without having to consider its lengthwise orientation (e.g. a 220 cm × 220 cm (87 in × 87 in) duvet). In American English, the word bedding generally does not include the mattress, bed frame, or bed base (such as box-spring), while in British English it does. In Australian and New Zealand English, bedding is often called manchester, especially in shops. Manchester was a center of the cotton industry in the late 18th and the 19th century, and into the 20th century, and so cotton goods (principally sheets and towels) were given the name 'Manchester goods', which later was simplified to 'manchester'. Shoe covers are disposable slip-on garments that fit snugly over a variety of shoe style and sizes. They prevent potentially hazardous material (including organic and chemical particles) from coming in contact with the bottom of a person's shoes. According to its material classification: non-woven shoe covers, plastic shoe covers, cloth shoe covers, anti-static shoe covers, flannel shoe covers, rain-proof shoe covers, non-slip shoe covers. In some industries with high frequency of glove replacement, it is usually recommended to use disposable gloves, which can not only avoid cross-infection, but also greatly save replacement costs, such as the medical industry, laboratory, food processing industry and other industries with high hygiene requirements. Disposable gloves are a type of gloves made of rubber sheets or films. According to the material, it is generally divided into plastic disposable gloves, latex disposable gloves, and nitrile disposable gloves; Among them, plastic film gloves are generally used in non-professional occasions. The advantage is that they are cheap, but because plastic disposable gloves are not elastic, their durability and suitability are relatively poor; Latex gloves are usually used in professional occasions, such as operating rooms, laboratories and other places that require high sanitary conditions. The advantage is that they have a certain elasticity and are more durable, but they are not resistant to animal grease corrosion, and are easily corroded by contact with animal grease. More importantly, according to statistics, 2%-17% of people will have varying degrees of allergy to latex. Nitrile gloves, in addition to having the characteristics of latex gloves, and improving the shortcomings of latex gloves, can first resist the corrosion of animal oils and fats, and will not cause allergies. Disposable slippers are generally used in five-star hotels, guesthouses, homes, and hospitality. Shoe length: 29.5cm, thickness 5mm, made of EVA wavy bottom TC cut velvet fabric. Disposable slippers are more convenient in production. Because the various sizes of disposable slippers are certain, it is easier to produce. And unlike those cotton slippers that can be recycled, which have higher requirements on the fabric of the slippers, the requirements for the fabric of disposable slippers are very low. Manufacturers do not need to consider too many factors during production, just a suitable size can quickly produce a lot of disposable slippers. It has good waterproof and slip resistance and breathability. Due to the various characteristics of the design of disposable slippers, the disposable slippers have various advantages, such as air permeability, waterproof and skid resistance, water absorption and so on. In this case, the disposable slippers will play a non-slip effect when worn. In view of these advantages, hotels can choose disposable slippers with confidence, because guests not only like clean and hygienic slippers, but also very comfortable slippers. Apart from that, disposable slippers are very light and quite soft and comfortable to wear. Although the production of disposable slippers is relatively simple and the cost is low, its comfort and softness are unquestionable, and it is very comfortable to wear. Therefore, the hotel can buy with confidence and choose clean and hygienic disposable slippers to provide services for guests. Non-woven shopping bag is a kind of green product, tough and durable, beautiful in appearance, good in air permeability, reusable, washable, screen printing advertisement, mark, long service life, suitable for any company and any industry as advertising and gifts. use. Consumers get a beautiful non-woven bag while shopping, and merchants get the best of both worlds with invisible advertising, so non-woven fabrics are becoming more and more popular in the market. The product is made of non-woven fabric, which is a new generation of environmentally friendly materials. It is moisture-proof, breathable, flexible, light in weight, non-combustible, easy to decompose, non-toxic and non-irritating, rich in color, low in price, and recyclable. The material can be naturally decomposed when placed outdoors for 90 days, and has a service life of up to 5 years when placed indoors.
Дата Публикации: 18-03-22
DIN 41612 was a DIN standard
Описание: DIN 41612 was a DIN standard DIN 41612 was a DIN standard for electrical connectors that are widely used in rack based electrical systems. Standardisation of the connectors is a pre-requisite for open systems, where users expect components from different suppliers to operate together. The most widely known use of DIN 41612 connectors is in the VMEbus and NuBus systems. The standard has withdrawn in favor of international standards IEC 60603-2 and EN 60603-2. DIN 41612 connectors are used in Pancon, STEbus, Futurebus, VMEbus, Multibus II, NuBus, VXI Bus, eurocard TRAM motherboards, and Europe Card Bus, all of which typically use male DIN 41612 connectors on Eurocards plugged into female DIN 41612 on the backplane in a 19-inch rack chassis. The standard describes connectors which may have one, two or three rows of contacts, which are labelled as rows a, b and c. Two row connectors may use rows a+b or rows a+c. The connectors may have 16 or 32 columns, which means that the possible permutations allow 16, 32, 48, 64 or 96 contacts. The rows and columns are on a 0.1 inch (2.54 mm) grid pitch. Insertion and removal force are controlled, and three durability grades are available. Often the female DIN 41612 connectors have press fit contacts rather than solder pin contacts, to avoid thermal shock to the backplane. A battery holder is one or more compartments or chambers for holding a battery. For dry cells, the holder must also make electrical contact with the battery terminals. For wet cells, cables are often connected to the battery terminals, as is found in automobiles or emergency lighting equipment. A battery holder is either a plastic case with the shape of the housing moulded as a compartment or compartments that accepts a battery or batteries, or a separate plastic holder that is mounted with screws, eyelets, glue, double-sided tape, or other means. Battery holders may have a lid to retain and protect the batteries or may be sealed to prevent damage to circuitry and components from battery leakage. Coiled spring wire or flat tabs that press against the battery terminals are the two most common methods of making the electrical connection inside a holder. External connections on battery holders are usually made by contacts with pins, surface mount feet, solder lugs, or wire leads. Where the battery is expected to last over the life of the product, no holder is necessary, and a tab welded to the battery terminals can be directly soldered to a printed circuit board. A pin header (or simply header) is a form of electrical connector. A male pin header consists of one or more rows of metal pins molded into a plastic base, often 2.54 mm (0.1 in) apart, though available in many spacings. Male pin headers are cost-effective due to their simplicity. The female counterparts are sometimes known as female socket headers, though there are numerous naming variations of male and female connectors. Historically, headers have sometimes been called "Berg connectors", but headers are manufactured by many companies. A SCSI connector is used to connect computer parts that use a system called SCSI to communicate with each other. Generally, two connectors, designated male and female, plug together to form a connection which allows two components, such as a computer and a disk drive, to communicate with each other. SCSI connectors can be electrical connectors or optical connectors. There have been a large variety of SCSI connectors in use at one time or another in the computer industry. Twenty-five years of evolution and three major revisions of the standards resulted in requirements for Parallel SCSI connectors that could handle an 8, 16 or 32 bit wide bus running at 5, 10 or 20 megatransfer/s, with conventional or differential signaling. Serial SCSI added another three transport types, each with one or more connector types. Manufacturers have frequently chosen connectors based on factors of size, cost, or convenience at the expense of compatibility. A card edge connector is the portion of a printed circuit board (PCB) consisting of traces leading to the edge of the board that are intended to plug into a matching socket. The edge connector is a money-saving device because it only requires a single discrete female connector (the male connector is formed out of the edge of the PCB), and they also tend to be fairly robust and durable. They are commonly used in computers for expansion slots for peripheral cards, such as PCI, PCI Express, and AGP cards. Terminal block is an accessory product used to realize electrical connection, which is divided into the category of connector in industry. With the increasing degree of industrial automation and the stricter and more precise requirements of industrial control, the amount of terminal blocks is gradually increasing. With the development of the electronics industry, the use of terminal blocks is increasing, and there are more and more types. In addition to PCB board terminals, the most widely used ones are hardware terminals, nut terminals, spring terminals and so on. The terminal is used to facilitate the connection of wires. It is actually a piece of metal enclosed in insulating plastic. There are holes at both ends to insert wires. There are screws for fastening or loosening, such as two wires, sometimes Need to connect, sometimes need to be disconnected, then you can use the terminal to connect them, and can be disconnected at any time, without having to solder or twist them together, very convenient and fast. And it is suitable for a large number of wire interconnections. In the power industry, there are special terminal blocks and terminal boxes, all of which are terminal blocks, single-layer, double-layer, current, voltage, common, breakable and so on. A certain crimping area is to ensure reliable contact and to ensure that enough current can pass. A circular connector is a type of connector whose basic structure is cylindrical and has a circular mating surface. In the interconnection classification, it belongs to category 5 and is used for interconnection between devices. Broadly speaking, it includes low-frequency circular connectors, RF coaxial connectors and audio connectors. The cylindrical structure of the circular connector is inherently robust and provides greater strength than any other shape. Automotive connectors are a component that electronic engineering technicians often touch. Its function is very simple: it sets up a bridge of communication between the blocked or isolated circuits in the circuit, so that the current flows and the circuit realizes the predetermined function. The form and structure of automotive connectors are ever-changing. They are mainly composed of four basic structural components, namely: contacts, shells (depending on the variety), insulators, and accessories. In the industry, it is usually also called sheath, connector, plastic shell. Board-to-board connectors are the connector products with the strongest transmission capacity among all connector product types, mainly used in power systems, communication networks, financial manufacturing, elevators, industrial automation, medical equipment, office equipment, home appliances, military manufacturing and other industries . An IC socket is an integrated circuit socket mounted on a circuit board, characterized by a plurality of electrical contacts arranged in a plurality of cavities. An integrated circuit socket includes an insulating shell, and the insulating shell has an integrated circuit package accommodating groove in which the integrated circuit package is accommodated. The contacts are embedded in cavities arranged in a matrix arrangement in the accommodating grooves of the integrated circuit package.
Дата Публикации: 18-03-22