Device and method for local ventilator protection technology to prevent gas overrun

Abstract

The present invention is applicable to the field of coal mine safety technology, and provides a device and method for preventing gas overrun in local ventilator protection technology, including a wind-connected switch and a detection circuit. Two wiring ports; the detection circuit includes a main office switch, a relay, a backup switch, a contactor and a gas substation relay, and the main office switch and the backup switch are all connected in series with the second wiring port. A group of relays are connected in series with the office switch. When the power fails to work with the backup office, the relay will fail to pull in when the power is off, so that the maintenance personnel can quickly find out, and at the same time quickly judge that the electrical equipment connected in series with the relay is faulty, avoiding the backup The damage of the local fan switch JDB cannot be found in time, the damage of the fuse or the intermediate relay cannot be found in time, and the contact point of the button cannot be found and dealt with in time.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a device and method for preventing gas from exceeding the limit in a local ventilator guarantee technology. Background technique [0002] The gas explosion has a certain concentration range, and the concentration range that can cause an explosion after the gas in the air encounters a fire is called the "gas explosion limit". The limit of gas explosion is 5% to 16%. "Gas over limit" means that the gas concentration in the coal mine mining face and other operating sites exceeds the gas concentration specified in the "Coal Mine Safety Regulations". When the gas concentration in the coal mining face reaches 1%, the alarm must be called, and if the gas concentration reaches or exceeds 1.5%, the power must be cut off and evacuated immediately. [0003] At present, most of the local fan switch models used in the excavation face are QBZ-120SF, and the auxiliary cont...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a local fan protection technology to prevent gas overrun device and method, aiming to solve the problem that most of the local fan switch models used in the excavation working face are QBZ-120SF, and the auxiliary contact of the main local fan switch is used to lock the air coupler switch The control loop exists, 1. The power failure of the backup fan switch cannot be detected in time

3. There are hidden dangers if the JDB of the backup fan switch is damaged and cannot be found and replaced in time

4. Damage to the fuse or intermediate relay cannot be found and dealt with in time

4. Poor contact point of the button cannot be detected and dealt with in time. 5. Use the main office fan to lock the power supply. When the backup office fails, the problem cannot be discovered in time

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