Self-reset explosion-proof door

Abstract

The invention relates to a self-reset explosion-proof door. The self-reset explosion-proof door is arranged at an air exhaust shaft mouth; a square underframe is closely connected on a foundation base; isosceles triangle vertical plates are vertically welded at the front and rear sides of the square underframe; a cross beam is connected with vertex angles of the triangular vertical plates at the two sides; door panels are hinged at edges at the left and right sides of the square underframe through a hinge; sealing strips are arranged around the periphery on the rear face of the door panels and are matched with a rectangle-shaped door frame formed by the cross beam and two isosceles edges of the vertical plates as well as the square underframe so as to realize sealing; counterweight supports are arranged at two sides of the foundation base; the front faces of the door panels are connected with heavy hammers through steel wire ropes wound on rollers of the counterweight supports; and two sides of the foundation base are further equipped with door openers, door closers and buffer devices. The self-reset explosion-proof door has the advantages of reasonable structure, reliable performance and capability of effectively realizing various functions such as load discharge, reverse ventilation, automatic locking and unlocking and the like, thus greatly improving operating efficiency and reliability, and enhancing safety degree for equipment operation.

Description

technical field [0001] The invention relates to coal mine safety equipment, in particular to a self-returning explosion-proof door for vertical wind shafts. Background technique [0002] The explosion-proof door is a special sealed manhole cover installed on the exhaust wellhead of the main ventilation fan in the coal mine. Its functions mainly include the following aspects: (1) During normal ventilation, it needs to maintain airtightness to isolate the underground air flow from the ground atmosphere and prevent The wind flow is short-circuited to ensure that the ventilation system is normal. (2) When a gas or coal dust explosion accident occurs underground, the explosion-proof door is opened by the blast airflow shock wave, and the explosive airflow is directly discharged to the ground atmosphere, reducing the pressure of the airflow in the mine, playing the role of pressure relief, and preventing the main ventilator from being damaged. Damage caused by the impact of explo...

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Problems solved by technology

[0003] The current explosion-proof door structure usually adopts a conical umbrella-shaped structure, and the sealing device is water-sealed. This type of explosion-proof door has the following disadvantages: (1) If the pressure relief time is long when the gas explodes, the explosion-proof door is easy to be blown away and cannot be damaged after being damaged. Ensure that the ventilation system is restored at the first time to discharge the poisonous and harmful gas in the mine, which will aggravate casualties

(2) The installation and maintenance of the explosion-proof door is inconvenient. The explosion-proof door needs to be manually lifted and rotated by 90 degrees. One end is pressed on the door body, and the other end is pressed on the thick plate embedded in the well wall. Buried bolts are tightened; in the case of insufficient personnel preparation or bad weather, the operation of locking the explosion-proof door takes a long time

(3) Since the sealing fluid of explosion-proof doors is mostly sealed with water, the water is easy to evaporate. Once the high and low pressure difference of the sealing water is less than the negative pressure of the ventilation, the water will suddenly be absorbed, resulting in serious air leakage. Therefore, it is necessary to check the sealing water frequently; In winter, the outdoor temperature in the northern region often reaches minus 15 degrees, and it is necessary to choose a non-flammable refrigerant, which is difficult to choose and use.

This structure can basically achieve the purpose that the explosion-proof door is easier to close, but there are still the following defects: (1) The main function of the coal mine explosion-proof door is to open in an instant when a gas explosion occurs in the mine, so as to quickly unload the shock wave, but The structure adopts 6 cylinders. Since the position of the cylinders is very close to the explosion-proof door when it works normally, the explosion-proof door cannot be fully opened in an instant when the gas explodes, so the air flow inside the well can easily impact the main fan.

(2) The hinged cylinder buffer device is complex and unreliable, and does not meet the safety and stability requirements of coal mines

(3) The structure uses a hydraulic jack to lift the counterweight to realize the locking of the explosion-proof door when the wind shaft is reversed. Due to the limited stroke of the jack, the steel wire rope needs a large stroke when the explosion-proof door is opened. Difficult. In addition, the positive pressure of the wellbore is relatively large when the wind is reversed. It is difficult to effectively seal the two explosion-proof doors only by their own weight, and there is a danger of the doors being opened. In addition, when the main fan stops, the explosion-proof doors cannot be easily opened. , carry out regular maintenance on explosion-proof doors in accordance with coal mine safety regulations

(4) There is no crossbeam support device in this structure. If the two doors are not synchronized when closing, the intersection in the middle will not be touched, and effective closing cannot be achieved; the structure does not properly consider the sealing problem

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