Flameproof speed sensor used for belt-broken protective device of belt conveyor

Abstract

The invention discloses a flameproof speed sensor used for a belt-broken protective device of a belt conveyor and relates to mining equipment. The flameproof speed sensor belongs to a digital code type speed sensor, and the explosion-proof form of the flameproof speed sensor is flameproof, wherein an inner chamber of an explosion-proof shell is provided with a clapboard to divide the inner cavity of the explosion-proof shell into a flameproof chamber and a wiring chamber, the flameproof chamber and the wiring chamber are internally and respectively provided with a group of ground tabs connected with grounding wires, a flameproof wiring terminal is arranged in a center hole of the clapboard, a joint surface between an excircle of the flameproof wiring terminal and the center hole of the clapboard is a flameproof joint surface, an encoder is positioned in the flameproof chamber, and a pulse numerical value output by the encoder is transmitted into an outboard PLC (Programmable Logic Controller) high-speed counter by the flameproof wiring terminal through a cable entry device and a mining multicore communication cable. When the belt speed is tested, the testing cannot be damaged by great inertial impact of a broken belt, the running speed of the belt can be tested in real time to truly reflect the running condition of the belt, so as to provide the only signal source for the belt-broken protective device to judge belt breaking.

Description

technical field [0001] The invention relates to a mine equipment, in particular to a speed signal detection sensor used on a broken belt protection device of a belt conveyor; ) Explosion-proof speed signal detection sensor for broken belt protection device for belt conveyor. Background technique [0002] At present, there are many types of sensors on the domestic market for detecting the signals of uphill (uplink) or downhill (downlink) belt conveyors transported in inclined shafts of coal mines. In summary, there are mainly the following types: Flameproof and intrinsically safe belt deviation sensor , flameproof and intrinsically safe belt tear sensor, flameproof and intrinsically safe belt tension sensor, flameproof and intrinsically safe belt smoke sensor and flameproof and intrinsically safe belt speed sensor; among them, flameproof and intrinsically safe belt The speed sensor detects the running speed of the belt. It has a built-in single-chip microcomputer chip. The m...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many types of sensors on the domestic market for detecting the signals of uphill (uplink) or downhill (downlink) belt conveyors transported in inclined shafts of coal mines. In summary, there are mainly the following types: Flameproof and intrinsically safe belt deviation sensor , flameproof and intrinsically safe belt tear sensor, flameproof and intrinsically safe belt tension sensor, flameproof and intrinsically safe belt smoke sensor and flameproof and intrinsically safe belt speed sensor; among them, flameproof and intrinsically safe belt The speed sensor detects the running speed of the belt. It has a built-in single-chip microcomputer chip. The measured speed signal is an analog signal, which is installed on the driving roller of the belt conveyor. This kind of belt speed sensor is more reliable in detecting the normal running speed signal of the belt and is widely used. , but the explosion-proof and intrinsically safe belt speed sensor cannot be used for the speed signal detection of the broken belt protection device of the belt conveyor. One of the reasons is that the explosion-proof and intrinsically safe belt speed sensor can only be installed on the belt conveyor drive On the roller, there is a built-in single-chip microcomputer chip. The belt speed signal detected by it is actually the speed of the conveyor driving the roller, and the output belt running speed is an analog signal. Whether the conveyor belt is running normally or suddenly broken, the conveyor driving roller is running Therefore, the speed signal detected by this sensor is not unique and cannot be used as the basis for the broken belt protection device to judge whether the belt is broken; the second reason is that the speed signal measured by the flameproof and intrinsically safe belt speed sensor is an analog quantity When the analog signal is converted into a digital signal (A / D), it is easily disturbed and distorted, which may cause a malfunction of the broken belt protection device

[0003] Based on the above reasons, the explosion-proof and intrinsically safe belt speed sensor cannot be used as a broken belt protection device for belt conveyor broken belt signal detection

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