Construction hoist band-type brake emergency stop protection device and construction hoist

Abstract

The invention discloses a construction hoist band-type brake sudden stop protection device and a construction hoist. A first fault detection module outputs a first signal representing that the construction hoist is to be stopped suddenly when detecting that the construction hoist has an emergency situation, and a wave sealing module is turned off immediately when receiving the first signal; a control signal which is sent by the first processing module and is used for controlling conduction of each switch tube in the frequency converter is cut off to realize hardware wave sealing; meanwhile, when receiving the first signal, the first processing module controls the rectification and voltage regulation circuit to stop voltage conversion so as to control the band-type brake coil to lose power and stop sending the control signal, and software band-type brake is achieved. Compared with the prior art, on the basis of not disconnecting a circuit breaker on a main control loop, the device accurately and reliably realizes brake emergency stop control through a dual control mode of combining software brake and hardware wave sealing, reduces the probability of occurrence of safety problems easily caused by adopting the mode in the prior art, and protects the frequency converter.

Description

technical field [0001] The invention relates to the field of circuit protection, in particular to a brake emergency stop protection device for a construction elevator and a construction elevator. Background technique [0002] At the construction site, in order to realize the safe operation of the construction hoist during the working process, the construction hoist needs to be able to stop suddenly when unexpected situations such as abnormal landing occur. Please refer to figure 1 , figure 1 It is a structural schematic diagram of a control circuit of a construction elevator in the prior art. The main control circuit in the control circuit includes a three-phase input power supply, a circuit breaker, a frequency converter and a motor connected in sequence. Between the circuit breaker and the frequency converter A rectification and voltage regulation circuit for converting AC power into DC power required by the brake coil is also connected between them, and the frequency co...

AI Technical Summary

Problems solved by technology

[0003] On this basis, there are mainly two ways to control the emergency stop of the construction hoist in the prior art. One is to manually disconnect the circuit breaker directly by the operator, which will cause the voltage input of the three-phase input power to be cut off immediately, and the inverter will be powered off. Stop, the motor stops, the brake coil is de-energized and the brake piece is locked

But this way of sudden power failure will have adverse effects on the inverter and the motor itself, and there is a great potential safety hazard; another way is to disconnect the emergency stop button to make the safety emergency The stop circuit operates to control the emergency stop of the construction elevator in a software-controlled manner, but this method is not reliable because the main control chip in the safety emergency stop circuit determines that the construction elevator does need an emergency stop to control the inverter to stop the output. For a certain period of time, there is a certain degree of control delay in this method, which may cause potential safety hazards

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