Slewing normally disengaged brake circuit of tower crane having emergent braking function in power turn-off situation

Abstract

The invention discloses a rotation open brake circuit of tower crane, with urgent-brake function in circuit breaking condition. The invention is based on the rotation open brake power supply circuit that formed by a power circuit (1), a brake coil circuit (2) and a open contact point (3) of brake contactor; the improved circuit-breaking urgent circuit (4) is formed by a charge circuit (5), a discharge circuit (6) and a accumulator (7); wherein, the input of charge circuit (5) is connected to the anode of power circuit (1) and the connecting point (8) of open contact point (3) of brake contactor; the output of charge circuit (5) is connected to the anode of accumulator (7) and the input of discharge circuit (6); the cathode of accumulator (7) is connected to the anode of power circuit (1) and one connecting point (9) of brake coil circuit (2); the output of discharge circuit (6) is connected to another end of open contact point (3) of brake contactor and the connecting point (10) at another end of brake coil circuit (2). The tower crane can keep rotation brake function when in circuit breaking condition.

Description

technical field [0001] The invention relates to a circuit, in particular to a slewing normally open braking circuit of a tower crane with an emergency braking function when the power is off. Background technique [0002] The slewing brake of the tower crane is divided into two types: normally open brake and normally closed brake. The brake is executed when the brake coil of the normally open brake is energized, and the brake is executed when the brake coil of the normally closed brake is powered off. The slewing brake of the wind-resistant tower crane must be released. The normally open brake coil is powered off and the brake is released. Most of them use normally open brakes, but there are also potential safety hazards in normally open brakes. If there is a sudden power failure, the brake function will be lost, which will cause harm to personnel and equipment on the construction site. Contents of the invention [0003] The object of the present invention is to provide a ...

AI Technical Summary

Problems solved by technology

[0002] The slewing brake of the tower crane is divided into two types: normally open brake and normally closed brake. The brake is executed when the brake coil of the normally open brake is energized, and the brake is executed when the brake coil of the normally closed brake is powered off. The slewing brake of the wind-resistant tower crane must be released. The normally open brake coil is powered off and the brake is released. Most of them use normally open brakes, but there are safety hazards in normally open brakes. If there is a sudden power failure, the brake function will be lost, which will cause harm to personnel and equipment on the construction site.

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