Dynamic safety monitoring device of brake and monitoring method

Abstract

The invention relates to a dynamic safety monitoring device of a brake and a monitoring method; a central processing unit (CPU) main board, a load sensor, an encoder and a driving control module are respectively connected with an acquisition card; the acquisition card acquires the signals of the load sensor and the encoder in real time through an analog input interface; the CPU main board reads the data in relevant channels in the acquisition card and calculates to obtain the information of a current load value, brake speed and brake displacement; a keyboard, a memory and a display are respectively connected with the CPU main board; and the data of the self-weight W0 of a sling or a cage, a brake torque alarm coefficient E1, a brake torque fault coefficient E2 and a brake torque average stable coefficient E3 are input to the CPU main board through the keyboard. The method measures the actual working load, the brake speed and the corresponding brake distance of a crane or a lifter through a sensor, and calculates the brake torque and analyzes the safety performance of the brake. The invention can detect the braking performance of the brake in real time, and provides great help for improving the safety and the reliability of hoisting and lifting machinery and promoting the industrial level.

Description

technical field [0001] The invention relates to a technology for on-site real-time monitoring of the braking torque of the brakes of various types of cranes and construction elevator drive systems, in particular to a dynamic safety monitoring device and method for the brakes. Background technique [0002] The brake in the driving system of the construction hoist is an important mechanism of the elevator. The magnitude and stability of the braking torque are related to the safe use of the elevator. At present, there have been many safety accidents related to the failure of the safety device. The safety factor of the brake of the crane hoisting system is not less than 1.5~2.5 according to the different regulations of the crane type and the workplace. GB10054 "Construction Hoist" stipulates that the safety factor of the brake is not less than 1.75. In fact, during the use of the brake, the actual braking torque is constantly changing, and the safety factor only reflects the bra...

AI Technical Summary

Problems solved by technology

It is not enough to rely solely on the static braking force or braking safety factor during maintenance and adjustment to illustrate the safety of the hoisting mechanism in terms of automatic capability

[0003] At present, the torque of the hoisting mechanism brake of hoisting and hoisting machinery is generally only statically detected during maintenance. Due to the difference in dynamic and static friction coefficients, the measured value of this detection method is different from the actual working condition.

At the same time, relying on the only braking torque to judge the safety of the brake is not sufficient

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