Digital pulling force alarm device

Abstract

Aiming at the technical problems and deficiencies existing in the existing mechanical tension alarm device (patent application number 201020003228.3), the present invention provides a digital tension alarm device with simple structure, convenient production, assembly and debugging, higher control accuracy and more stable performance. alarm system. In order to achieve the above object, the present invention adopts the following technical solutions: a digital tension alarm device, which is characterized by: a sensor: it obtains an electrical signal according to the tension at the end of the construction machinery cable; an amplifying circuit: it amplifies the electrical signal and sends it to To the control unit; the control unit: it detects the output voltage of the amplifying circuit, and outputs an alarm control signal when the output voltage changes from a state of constant speed increase to a state of sharp increase and the speed of increase exceeds the limit value , taking the specific value of the output voltage recorded at the moment when the transition occurs as a reference value, and when it detects that the output voltage is continuously lower than or equal to the reference value, it outputs a control signal for disarming the alarm; the execution unit: according to The control signal output from the control unit operates to control the circuit in the construction machine.

Description

technical field [0001] The invention relates to the field of construction, in particular to a digital tension alarm device for preventing cables of construction machinery from being broken. Background technique [0002] The cables of construction machinery such as construction elevators and hanging baskets for high-altitude operations are often broken. The existing tension alarm device for preventing cables from being broken is a mechanical device composed of springs and moving parts (patent application number is 201020003228.3) , the device has the following technical problems and weak points: [0003] 1. The structure of the device is complex, many parts need mold production, and the production and assembly costs are relatively high. [0004] 2. The device uses the thread structure to adjust the spring force to set some parameters. The error of the set value is large, so the control accuracy is very low, and the debugging process is very complicated. [0005] 3. After th...

AI Technical Summary

Problems solved by technology

The digital pull alarm device can solve the problem of restarting the construction machinery due to the installation of the mechanical pull alarm device.

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