Double-passage eccentricity preventing overload protector

Abstract

The invention provides a double-passage eccentricity preventing overload protector, and relates to the technical field of punchers. The protector comprises an air cylinder seat, a cylinder body, an oil pressure seat and a pressure relieving seat which are sequentially combined, and the protector further comprises pneumatic pumps which are arranged in the air cylinder seat and cylinder body, an oilsuction valve arranged in the oil pressure seat, an oil outlet valve and a corresponding oil pressure suction port and oil pressure output port, an oil discharging valve arranged in the pressure relieving seat and a corresponding discharging port, a pressure relieving piston arranged in the pressure relieving seat, a travel switch electrical route and an air pressure inlet, and an unbalanced loadpreventing mechanism arranged on the oil pressure seat. The structure has the advantages that double-crank-shaft punchers with large tonnage (200 t or above) can be met, the demands of market are met, puncher equipment can be protected, and the protector can be prevented from damage.

Description

technical field [0001] The invention relates to the overload protection of a punch press, in particular to a dual-channel anti-eccentric overload protector. Background technique [0002] Oil pump overload generally occurs in winter when the temperature is low. When the wind turbine fails and stops for a long time, the temperature drops more and the viscosity of the oil increases, resulting in a heavy load when the oil pump is started, resulting in overload of the oil pump motor. The second reason is that in some units with a long service life, the oil seal of the output shaft of the oil pump motor is aging, which causes oil to enter the terminal box and cause poor contact of the terminals, unbalanced three-phase current, and overload of the oil pump. A large amount will enter the oil pump motor winding, destroy the winding air gap, and cause equipment overload. After the above situation occurs, the oil seal should be replaced, the terminal box and motor winding should be cl...

AI Technical Summary

Problems solved by technology

[0002] Oil pump overload generally occurs in winter when the temperature is low. When the wind turbine fails for a long time, the temperature drops a lot, and the oil viscosity increases, causing the oil pump to start with a heavy load, resulting in overload of the oil pump motor.

The second reason is that in some units with a long service life, the oil seal of the output shaft of the oil pump motor is aging, which causes oil to enter the terminal box and cause poor contact of the terminals, unbalanced three-phase current, and overload of the oil pump. A large amount will enter the oil pump motor winding, destroy the winding air gap, and cause equipment overload

[0004] The current overload protectors are generally limited to single-axis punches below 160t, but there is a lack of protection for large-tonnage double-axis punches, because when the tonnage of the punch is large and the oil pressure is large, it is easy to appear unbalanced load. Not only will it affect the protection, but it will also damage the protection device. Therefore, the overload protector in the current structure is obviously not suitable for large-tonnage punching machines.

[0005] Moreover, the current overload protection device has the disadvantages of low stability, short life, and less oil output from the pump head, and has a complex structure, many vulnerable parts, complicated processing, and difficult maintenance. The output check valve is mostly used, and the input is also The one-way output check valve is mostly one-piece, which cannot be repaired and can only be replaced completely, resulting in waste of resources; while the input check valve is a split type, and the main part is fixed only by the sealing rubber ring, which is very easy to install during transportation or sub-boxing The time is lost, and the oil pressure output port is single, which cannot meet the needs of various punching equipment

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