Device used to monitor bolt fracture or looseness

Abstract

The invention relates to a device used to monitor bolt fracture or looseness. The device comprises a housing in a cylindrical shape. The lower part of the housing is made of an insulating material. The housing is internally provided with a cavity which is provided with an opening on the lower end, and the device also comprises a monitoring circuit. The monitoring circuit comprises a power supply, a switch assembly, a resistor connected with the anode of a power supply, and an output end connected with the resistor. The connecting point of the resistor and the output end is connected with one end of the switch assembly. The other end of the switch assembly is connected with ground. The switch assembly comprises a monitoring plate arranged on the head of a locknut or a bolt, and a trigger structure fixed in the cavity. A plurality of series-connected normally-closed switches or a plurality of parallel-connected normally-open switches are formed between the monitoring plate and the trigger structure. The device is simple in structure, convenient in installation, low in cost, wide in monitoring range, high in monitoring precision, and low in power consumption of the monitoring circuit, and sensitive in response. Using the device, manual polling is not needed, and output signals are monitored after the device is installed, thereby greatly improving working efficiency, and saving manpower and material resources.

Description

technical field [0001] The invention relates to monitoring equipment for bolts, in particular to a device for monitoring broken or loose bolts. Background technique [0002] Large bolts and nuts are used in many fields, such as rail transit, large machinery, building construction, etc. Generally, the bolts pass through the base and the fastened parts, and the fastened parts are fixed on the base through washers, fastening nuts and locknuts. In the normal operation process, due to various reasons such as impact, the bolts are prone to breakage, and the fastening nuts or locknuts are loose, which has caused serious safety hazards to the lives of the staff. The detection of bolt breakage and looseness is mostly manual inspection, which has a large workload, time-consuming and high cost. Moreover, the installation structure of many bolts is special, the stress situation is complicated, and the number of detections is huge, which makes the detection of bolts more complicated an...

AI Technical Summary

Problems solved by technology

[0003] 1. Since the upward movement of the nut is very irregular when the nut is loose, if the nut does not touch the two pieces of iron at the same time during the upward movement, the device cannot play a monitoring role

[0004] 2. The nut and the two iron sheets in the monitoring device are in direct contact with the atmosphere, which is prone to corrosion or oxidation, which will cause the circuit to fail to connect when the nut is loose, so the detection of the device is not accurate enough

[0005] 3. The monitoring device is installed on the screw rod of the bolt as a whole. It cannot monitor the bolt structure that is directly screwed on the base and the bolt tail is not exposed, nor can it monitor the situation of bolt breakage. Bolt breakage often occurs and is more dangerous.

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