Water-control type water-return secondary stop safety protector for hydraulic compressor

Abstract

The invention discloses a water-control type water-return secondary stop safety protector for a hydraulic compressor. A high-pressure electromagnetic valve is serially arranged on a water return pipeline of a distributor of the hydraulic compressor and is respectively in a water-path opening state and a water-path cut-off state when the high-pressure electromagnetic valve is electrified or power off. The power supply input end of the high-pressure electromagnetic valve is connected with a power supply wire after being connected with a normal-open switch of a corresponding intermediate relay inseries, and an automatic control circuit of the intermediate relay comprises a travel switch arranged on an operating disc of the hydraulic compressor. The intermediate relay is a normal-open relay,and the travel switch is respectively in a switched-on state and a switched-off state when the operating disc is not zeroized. In the normal work of the hydraulic compressor, the operating disc is notin the zeroized state, the high-pressure electromagnetic valve is electrified, and the water path is in an open state, or else, the water path is in a cut-off state to prevent the accident. The invention realizes the secondary protection of the hydraulic compressor.

Description

technical field [0001] The invention relates to a water-controlled backwater secondary cut-off safety protection device for a hydraulic press, in particular to a hydraulic press that utilizes a hydraulic press that "after the backwater is cut off, its main slider and edge slider are at rest or at a very slow speed. State" characteristics to achieve safety protection of the water-controlled backwater secondary cut-off safety protection device. Background technique [0002] The hydraulic press is mainly used for stamping and edge stretching of large parts. The working pressure is 17-20Mpa. The device sends the high-pressure water in the accumulator station to the corresponding hydraulic cylinder, thereby pushing the corresponding piston to make the main slider, edge holder slider, mobile worktable, ejector and locking device act. [0003] This kind of large-scale hydraulic press is typically represented by the 1600 / 2200-ton hydraulic press produced in China in the early years...

AI Technical Summary

Problems solved by technology

The problems of this type of hydraulic machine are: (1) When loading and unloading part of the tooling mold, it is necessary to raise the main slider to a certain height and then stop, and then the operator enters the main slider to load and unload the mold. The position below the main slider, because only the hydraulic press is in a safe state, so once the electrical device of the hydraulic press fails or the sealing ring is damaged and leaks, the self-locking device of the valve will fail, which will lead to the failure of the 56-ton main slider and The main cylinder (the main slider weighs 38 tons and the main cylinder weighs 18 tons) moves down quickly until it hits the ground, causing the cylinder to fall off, and high-pressure water gushes out, seriously endangering the life safety of the operators under the main slider and the safety of surrounding equipment and facilities; (2) When loading and unloading tooling molds, the blank holder slider needs to be raised to a certain height, the main slider stops at the lowest position, and then 4 operators enter the main slider to load and unload molds. At this time, people are in the Within the closed area between the blank holder slider and the main slider, once the electrical device of the hydraulic press fails or the sealing ring is damaged and leaks, the self-locking device of the valve will fail, and the 48-ton blank holder slider will move down quickly until it is in contact with the main slider. The slider is closed, which seriously endangers the life safety of the personnel between the main slider and the blank holder slider; (3) During the normal movement process of the main slider and the blank holder slider of the hydraulic press, if there is a sudden power failure at this time, the The valve opened at the time will not be able to be closed through the control panel, and the slider will move down until it hits the ground, which will also cause safety hazards

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