Pressure pad device of mechanical press

Abstract

The invention relates to a pressure pad device of a mechanical press. The pressure pad device comprises an ejector rod supporting plate on which an ejector rod is arranged; the pressure pad device also comprises a cylinder with a power source and a hydraulic cylinder without a power source, wherein both the cylinder and the hydraulic cylinder are fixedly connected with the ejector rod supporting plate, a rod-holding cavity and a rod-free cavity of the hydraulic cylinder are connected with an oil tank through oil pipes respectively, and a charging valve is connected in series to the oil pipes; and the rod-free cavity of the hydraulic cylinder is connected with a booster oil passage, and the rod-holding cavity of the hydraulic cylinder is connected with an unloading oil passage. The hydraulic cylinder is boosted by the booster oil passage after a sliding block descends to press the ejector rod, and is matched with the cylinder to achieve the rated pressure requirement, so that the cylinder does not need to be designed into a multistage cylinder with huge volume, meanwhile, the consumption of a gas source is reduced, and the use cost of a user is reduced; after the sliding block ascends, the unloading loop of the hydraulic cylinder is respectively locked, quickly unloaded and slowly unloaded according to the process requirements, and the ejector rod is fist static, then quickly ascends and slowly ascends when approaching an upper dead point, so that high impact and noise are reduced.

Description

technical field [0001] The invention relates to a pressure pad device of a mechanical press, in particular to a pressure pad device of a mechanical press with a compact structure and energy saving. Background technique [0002] The pressure pad of the mechanical press is used for blank-holding and unloading during deep drawing, and as a jacking piece during punching. The current pressure pads are all pneumatic, and are composed of an air storage tank connected to a cylinder. In order to achieve the rated tonnage, Usually the cylinder of the air cushion is made into a multi-stage cylinder, which is bulky. In the process, the pressure pad is required not to rise and reset immediately with the slider, but to reset after a period of delay to avoid deformation of the workpiece. This function is called the pressure point locking function. In order to realize the locking function, additional locking components need to be connected to the multi-stage cylinder, which further increas...

AI Technical Summary

Problems solved by technology

Generally, if the press is buried below the workbench and below the ground surface, a deep pit needs to be set up. For example, for a press of about 400 tons, the pit is generally more than 5 meters, and the cost of the pit remains high, which brings serious economic burden to the enterprise.

[0003] In addition, the stroke height of the pressure pad generally needs to be adjustable, and an additional stroke adjustment mechanism needs to be installed, and the production cost is relatively high.

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