Vacuum worktable capable of heating and accurately positioning

Abstract

The invention relates to a vacuum worktable capable of heating and accurately positioning, comprising a vacuum layer, wherein a plurality of rows of suction holes are arranged above the vacuum layer, and a plurality of gas loops which communicat with one another and are vertical and communicated with the suction holes are arranged on the bottom surface; a heating layer is arranged below the vacuum layer, and a vacuum cavity is formed by the gas loops and the suction holes after the vacuum layer is adhered to the heating layer. The vacuum worktable has the advantages of simple principle, simple and reasonable structure and low cost; as a heating device is arranged, the vacuum worktable can be used for carrying out accurate positioning work on a plate material work piece when the vacuum worktable is heated to a certain temperature to obtain sealing glue with a suitable viscosity-temperature characteristic to coat on the plate material work piece; the vacuum worktable is made of graphite, and the good heat-conduction performance and the smaller coefficient of thermal expansion provide effective guarantees to the temperature conditions of sealing, coating and machining the plate material work piece and accurate positioning; and furthermore, a groove is arranged on the surface of the vacuum layer, so that a bulged part of the plate material work piece can be inserted in the groove of the worktable, and the influences of the bulged part on the positioning is avoided.

Description

technical field [0001] The invention relates to a vacuum suction positioning workbench, in particular to a precise positioning of the sheet when the sealant that needs to be heated to a certain temperature in order to obtain better temperature-viscosity properties is coated on the sheet fixture. Background technique [0002] Before the present invention was made, in the prior art, when the sheet metal workpiece was positioned and processed, the pressing plate was usually used to cooperate with the screw locking fixture or the simple suction cup fixture. When the clamp is used, the positioning accuracy is poor, and it is easy to cause the peripheral pressure to be tight and the middle to bulge, which will affect the processing accuracy. Using the suction cup fixture can better solve the problem of the pressure plate fixture. However, whether it is a pressure plate fixture or a vacuum suction cup fixture, the existing patented technology does not mention or contain a heating...

AI Technical Summary

Problems solved by technology

However, whether it is a pressure plate fixture or a vacuum suction cup fixture, the existing patented technology does not mention or contain a heating function, which is incompetent for workpieces that need to be heated to process. Moreover, ordinary vacuum table suction holes or suction cups do Larger, when absorbing sheet metal workpieces, there will still be a certain degree of inhomogeneity, that is, the suction holes or suction cups will be tightly attached, and the farther away from the suction holes or suction cups will be slightly bulged, resulting in machining accuracy. Not guaranteed

For example, in the patent of CN1748943A, the Chinese Patent Publication No. mentions a kind of self-adaptive vacuum chuck workbench. A separate solenoid valve to control the closing and opening is bound to limit the number of through holes, so the diameter of the through holes must be large enough to make a small number of through holes generate enough negative pressure to fix the workpiece, which is for sheet metal The precise positioning of the workpiece is definitely disadvantageous; in addition, due to the extensive use of solenoid valves, it is impossible to control the cost at a low level

In the Chinese Patent Publication No. CN101386223A, a polarizer peeling device is mentioned. What this device contains is just a common vacuum suction device, and there is no mention of heating function.

And in the patent that Chinese Patent Publication No. is CN101733651A, a kind of vacuum fixture and its application method for porous thin plate processing are mentioned, but it still does not contain heating function

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