A pressure sensor for load weighing of mine multi-rope hoist

Abstract

A pressure sensor for weighing a load of a mine multi-rope hoist, comprising a base (2) and an end cover (3). The cross section of the end cover (3) is T-shaped, a groove (6) is provided on an upper end face of the end cover, and a stepped blind hole (7) is provided in the interior below the groove (6); a wire channel (9) in communication with the stepped blind hole (7) is provided on the circumference of the end cover (3); a cylindrical oil chamber (10) is coaxially provided below the stepped blind hole (7), a lower end of the cylindrical oil chamber (10) penetrates through the bottom of the end cover (3), a strain beam (11) is provided in a gap between an upper end of the cylindrical oil chamber (10) and a lower end face of the stepped blind hole (7), and a strain gage (8) is attached to an upper surface of the strain beam (11); the base (2) is U-shaped, an upper portion of the inner side of the groove on the upper end surface of the base is in threaded fit with an upper portion of the periphery of a boss at a lower end surface of the end cover (3), and a flat oil chamber (12) is formed between a upper end face of the groove and a lower end face of the boss; an oil injection channel (23) in communication with the oil chamber (12) is provided on the circumference of the outer side of the base (2); a support base (13) under the base (2) is mounted in a groove formed on a slide block (14) of a balance cylinder (4); a part below the oil chamber (12) and between the oil chamber and the support base (13) is a cantilever beam (15); and a perforated plate (16) is embedded in the cylindrical oil chamber (10). The sensor can improve the accuracy of calculating the hoist load.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to a pressure sensor used for load weighing of a multi-rope hoist in a mine, and belongs to the technical field of mine hoists. Background technique [0002] The hoisting system is the "throat" of coal mine production and transportation, and its normal operation plays an important role in the life safety of miners and the production safety of coal mines. During the operation of the lifting system, due to the constraints of the site environment, it is difficult to directly measure the load of the hoist. Considering that the hoist is suspended at the end of the wire rope, the real-time weighing of the total load of the hoist can be realized indirectly by measuring the tension of the wire rope. [0003] At present, it is common to monitor the wire rope tension by measuring the oil pressure of the balance cylinder in the automatic balance device of the wire rope tension of the multi-rope hoist. How...

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Problems solved by technology

[0003] At present, it is common to monitor the wire rope tension by measuring the oil pressure of the balance cylinder in the automatic balance device of the wire rope tension of the multi-rope hoist. However, due to the friction between the piston rod and the inner wall of the oil cylinder, the measured wire rope tension is not accurate enough.

In order to solve this problem, in the prior art, an ordinary pressure sensor is installed between the piston rod and the slider of the balance oil cylinder, but due to factors such as the rough surface of the tank road and wind resistance, the vibration of the wire rope is relatively severe, so the measured data will have There is still a large gap between the measured tension of the wire rope and the actual load of the hoist due to a lot of sudden jump interference

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