CN105089690A - Novel coal mine vertical air shaft explosion-proof door - Google Patents

Abstract

The invention is a novel explosion-proof door for vertical air shafts in coal mines, which mainly relates to the field of ventilation systems for coal mines. The feature is that one end of the explosion-proof door is fixed by a hinge, and the other end is provided with a hinge hole. Behind the hinged end, a reinforced concrete wall is built, and two pulleys are set at both ends of the upper part of the wall, and the explosion-proof door and the counterweight are connected by two steel wire ropes passing through the fixed pulley. The I-beam 7 and 8 are hinged, and the detachable spring 1 forms the reset device of the explosion-proof door. When an explosion occurs underground, the explosion-proof door is opened on one side to release the pressure under the action of the explosion air wave. After the pressure is released, the explosion-proof door quickly returns to its original position under the action of the reset device. When the mine conducts an anti-wind drill, the drill personnel only need to insert the steel beam into the opening end of the explosion-proof door after the drill command is issued, and the explosion-proof door can be quickly closed. The invention has reasonable structure and reliable performance, not only can realize the requirement of anti-wind drill, but also can greatly improve the anti-shock ability of the existing explosion-proof door.

Description

A new type of explosion-proof door for vertical wind shaft in coal mine

technical field

The invention relates to the fields of coal mine safety protection and mine ventilation system adjustment, and uses a mechanical structure to realize an explosion-proof door that can be automatically closed in time after an explosion occurs in a coal mine.

Background technique

The explosion-proof door is a special sealed manhole cover installed on the exhaust wellhead where the main fan is installed. At present, most of the explosion-proof doors for vertical wind shafts used in coal mines are composed of manhole covers, steel wire ropes, and counterweights. During normal ventilation, it is used to isolate the downhole airflow from the ground atmosphere to prevent short-circuit of the airflow and ensure the normal ventilation system. When a gas or coal dust explosion accident occurs underground, the explosion-proof door is opened by the explosion airflow, so that the explosion airflow is directly discharged to the ground atmosphere, which plays the role of pressure relief and prevents the main ventilator from being damaged by the explosion airflow impact; When the main ventilator stops running, the explosion-proof door can be opened to utilize natural wind pressure for ventilation.

However, there are the following three problems in the general shaft air shaft explosion-proof door: ① Once the intensity of the explosion in the mine is high, the explosion-proof door is often blown away by the explosion airflow, so that the ventilation cannot be restored at the first time, and the rescue work cannot be carried out in the first place. ②When the main ventilator is powered off and restored, the explosion-proof door cannot be opened and closed in a timely and convenient manner; ③During the anti-wind exercise, it is often impossible to fasten the explosion-proof door in the shortest time.

Contents of the invention

In order to make up for the problem that the explosion-proof door of the vertical wind shaft of the existing coal mine was lifted away when the coal mine exploded, and the ventilation could not be restored at the first time. The invention proposes a novel explosion-proof manhole cover, which uses a reliable mechanical structure to enable the explosion-proof door to be automatically closed in time after an explosion occurs in a coal mine.

The technical scheme adopted in the patent of the present invention is: add two fixing devices at both ends of the explosion-proof door, one end is fixed in a hinged manner, so that it can only be opened on one side like a common manhole cover, and the other end is provided with a hinged hole, which will not be dealt with temporarily . After the hinged end, a reinforced concrete wall is built. Two fixed pulleys are set at both ends of the upper part of the wall. The upper two pulleys are connected with steel wire ropes. One end of the steel wire rope is connected to the explosion-proof door, and the other end is connected to the counterweight through two fixed pulleys. A section of I-beam 7 is hinged at the center of the explosion-proof door, and a section of I-beam 8 is hinged above the center line of the wall. The I-beam 7 and 8 are hinged, and a detachable spring is arranged at the hinge. The two wire ropes of the counterweight are parallel to the hinged I-beam. When a gas or coal dust explosion accident occurs underground, the explosion-proof door is opened by the blast airflow. When the explosion-proof door opens to a certain angle, the I-beams hinged together will approach each other. At this time, the spring set on the I-beam It will work to prevent the explosion-proof door from continuing to open, and under the action of elastic force and inertia, it will prompt the explosion-proof door to return to its original position, so that the ventilation will be restored in the first time after the pressure is released. When the main ventilator cannot operate due to power failure or other reasons, the spring on the I-beam can be removed, and the explosion-proof door can be opened quickly through the counterweight, and the natural wind pressure is used for ventilation. When the power is restored, it only needs to be adjusted. A counterweight will suffice. When conducting anti-wind exercises, once the exercise command is issued, the drill personnel only need to insert a section of steel beam at the opening end of the explosion-proof door, and then the explosion-proof door can be closed quickly, so as to achieve a short-term wind flow reversal.

The invention solves the problem that the explosion-proof door cannot be opened and closed in time and conveniently when an explosion occurs underground and the explosion-proof door is lifted off, and when the fan is powered off and restored. It can improve the timely closure of the explosion-proof door after the gas or coal dust explosion occurs in the mine ventilation system, ensure the stability of the main ventilator when it stops for some reason and during the anti-wind drill, improve the disaster resistance of the mine, and avoid mine disasters to the greatest extent expansion.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a left side view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is the plan view of the present invention, and 1,7,8 form resetter, 2 well covers, 3 counterweights, 4 fixed pulleys, 5 shafts, 6 door bolts.

Detailed ways

1. Add two fixing devices at both ends of the explosion-proof door, one end is fixed with a hinge, so that it can only be opened on one side like a common manhole cover, and the other end is provided with a hinge hole, which will not be dealt with temporarily. After the hinged end, a reinforced concrete wall is built. Two fixed pulleys are set at both ends of the upper part of the wall. The upper two pulleys are connected with steel wire ropes. One end of the steel wire rope is connected to the explosion-proof door, and the other end is connected to the counterweight through two fixed pulleys.

2. A section of I-beam 7 is hinged at the center of the explosion-proof door, and a section of I-beam 8 is hinged above the center line of the wall. I-beam 7 and 8 are hinged, and a detachable spring is provided at the hinge.

3. Parallel the two wire ropes of the counterweight to the hinged I-beam.

Claims (5)

1. A new explosion-proof door for the vertical wind shaft of the coal mine ventilation system. 2. Compared with ordinary explosion-proof doors, the feature is that it can close the explosion-proof doors in time after the explosion in the coal mine, and it is conducive to the timely closing of the explosion-proof doors in the anti-wind exercise. 3. The explosion-proof door of the vertical air shaft of the new coal mine ventilation system according to claim 1, characterized in that the explosion-proof door is opened on one side, and there is a hinged hole at the end of the opened side, which is convenient to realize the explosion-proof door during anti-wind exercises. Close quickly, so that the wind flow reversal can be achieved in a short time. 4. The explosion-proof door of the vertical air shaft of the new coal mine ventilation system according to claim 1, characterized in that the central hinge of the explosion-proof door is connected with a section of I-beam 7, and the center line of the wall is hinged with a section of I-beam 8, and the I-beam 7 is hinged. , 8 hinges, with detachable springs at the hinges. 5. The two steel wire ropes of the balance weight are parallel to the hinged I-beam.