"Гибкие Автоматизированные Производства" |
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| Отсканированные страницы с текстом из пособия "ГАП" в формате GIF ¬ |
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Данный сайт, на котором Вы сейчас находитесь, называется "Пособие по обучению чтению на английском языке, М.Я. Баракова, Г.А. Мкртчян, Н.И. Наумова, 1990 г.".
Если Вы искали именно, это тогда вам сильно повезло. Здесь Вы найдете все необходимые тексты, находящиеся в учебнике и даже готовый перевод, который нужно просто взять и распечатать. |
Выше как Вы уже видели, находятся отсканированное изображение некоторых страниц в формате GIF взятые из Пособия по обучению чтению на английском языке название, которого "Гибкие Автоматизированные Производства".
Формат GIF это простая картинка, которую можно распечатать или просмотреть как в обычном, так и в увеличенном виде. |
Если посмотреть ниже там Вы сможете найти тот самый текст, который видели выше, но уже не в GIF, а в текстовом формате. Это сделано специально для тех, кому лень распознать текст, через какие либо программы для дальнейшего использования.
И еще одна фишка сайта заключается в том, что Вам не придется переводить тексты, это уже сделали за вас. |
| Вам необходимо, что-либо найти? Воспользуйтесь поиском. Может он Вам чем-то поможет. Удачи!!! |
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| Распознанный текст в формате DOC с отсканированных страниц расположенных выше ¬ |
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The majority of workpicccs now in practice arc between the two extremes of size, with weights ranging from 500 kg to three or four tons. This is the main application area for AGVs.
CONVEYOR SYSTEMS FOR FLEXIBLE ASSEMBLY OPERATIONS
Modularity, programmability, and compatibility with work stations arc key features of conveyors for flexible assembly.
Today's flexible assembly installations require that conveyors be used as systems, not as isolated pieces of equipment. Many of these conveyors arc being packaged with integral computers and controls. And the systems are often designed so that the user can make changes, in both hardware configuration, and in software control, by himself.
These flexible systems, where loads can be selectively routed to a variety of work stations, are becoming increasingly common. If installed properly, they provide a number of benefits. They reduce work-in-process, improve product quality, maximize use of floor space, minimize capital expenditures, and provide the flexibility to change or relocate the assembly operation.
But when installing equipment for these operations it is important to plan for tomorrow's needs as well as today's. In the rapidly changing market place, conveyor systems must adapt quickly to the introduction of new products.
A variety of assembly schemes can be accommodated by these systems. Dispatch operations where work returns to a central area after each assembly step is the traditional approach. Progressive assembly featuring automatic station-to-station routing and recirculation loops is becoming more common. Flexible systems often accommodate both schemes simultaneously.
Many types of conveyors have been used to achieve flexibility including power and free systems, and towlines. The paper highlights three types that are especially well suited to flexible assembly: inverted power and free, car-on-track, and transporters, including some of the recent advances on the basic transporter concept.
These conveyors have different physical characteristics but are similar in several respects. They are all modular in construction, adaptable to a variety of control schemes and designed to interface with automated work stations.
The inverted power and free conveyor consists of a free trolley and a power trolley riding on an inverted track mounted on the ground. The power trolley is driven by a chain and is connected to the free or load trolley by a pusher or puller dog assembly. A rear cam disengages if necessary for accumulation or other preprogrammed conditions.
The inverted power and free conveyor has all the advantages |
of the standard power and free plus some of its own. Like all power and free, inverted accommodates accumulation, automatic routing and variable speed operation. Carriers can be coded for dispatch to various destinations, and positive load control over every carrier in the system is provided.
Switches, stops and transfer mechanisms provide the capability for switching to different tracks for sorting, reworking or rerouting.
Several advantages result from the inverted nature of the configuration. First, it allows free access to the load from all sides and above. This makes assembly operations easier and is especially important in automatic assembly where robots might be involved. Robots typically require an unhindered work area.
Another advantage of the inverted design is that all mechanisms are located below the product so that there is no risk of contamination by falling debris or oil. This makes the carriers easier to maintain.
Maintenance is also simple compared to an overhead conveyor because it is much easier to get at a trouble spot down on I the ground.
Inverted power and free also has the advantage of reducing the load on the overhead structural elements of the building since I (he structure is supported on the ground.
Various types of loads have been carried by inverted power and free conveyors. In fact, the automobile industry is one of the biggest users of the technology. The overall market potential for these conveyors is large. Specialists consider that almost any type of floor conveyor could be replaced by inverted power and free.
Car-on-track conveyors consist of carriers riding on two rails and propelled by a spinning tube. A drive wheel on the bottom of each carrier provides contact with the tube. Acceleration, deceleration and stopping position can be precisely controlled by controlling the contact angle between the wheel and the tube. Flexibility in routing is obtained by diverting cars from track to track.
Carriers in some car-on-track systems can be positioned with fine precision to within .005 in. in 3 axes, which can be important when interfacing with robotic work stations. However their cost may be two to three times that of less precise equipment.
The cars can be routed to robots by a host computer which can change the sequence depending on the need.
Carriers can also be moved independently and at different speeds in different parts of the system.
With two supporting tracks the spinning tube systems are very stable and can be used to carry bulky, delicate loads.
These conveyors are not appropriate for applications such as
dip tanks or spray areas which would foul the propulsion mechanism. |
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Для быстрого перехода от страницы к странице пользуйтесь навигацией (ниже) ¬ |
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