Pressure-relief type automatic multi-buffered reset explosion door

Abstract

The invention discloses a pressure-relief type automatic multi-buffered reset explosion door, and relates to the field of a coal mine ventilation system. The explosion door comprises a sealing base, two side vertical plates, two slant opening doors and a tension spring component, wherein the tension spring component comprises two tension spring mounting seats and a tension spring; the tension spring mounting seats are connected to the outer sides of the slant opening doors; the two ends of the tension spring are connected with the tension spring mounting seats respectively; a driving shaft and a driven shaft are supported between the two side vertical plates and are both connected with a group of crank gear link mechanism; each group of crank gear link mechanism comprises two gears, two cranks and two links; one end of each crank is connected with one gear, and the other end of each crank is hinged to one end of one link; the other end of each link is hinged to one slant opening door respectively; the gear on the driving shaft is engaged with the gear on the driven shaft; one end of the driving shaft is connected with an electromagnetic clutch, a speed reducer and a motor in sequence. According to the door, pressure relief and timely reset can be realized, and the two doors are synchronously opened and closed.

Description

technical field [0001] The invention relates to the field of underground ventilation systems in coal mines, in particular to the structure of explosion-proof doors. Background technique [0002] The explosion-proof door of the coal mine return air shaft is an important component of the underground coal mine ventilation system. At present, all standard coal mines in my country are required to install explosion-proof doors and covers in order to protect the main fan from being damaged when the explosion shock wave arrives. During normal ventilation, it is used to isolate the downhole airflow from the ground atmosphere, prevent short circuit of the airflow, and ensure the normal operation of the ventilation system; when a gas or coal dust explosion occurs underground, the explosion-proof door will be opened by the explosion airflow, and the shock wave will be directly discharged into the The external atmosphere on the ground plays a role of pressure relief and prevents the mai...

AI Technical Summary

Problems solved by technology

[0005] 1) When the explosion-proof door is raised to the design height, the wellhead of the air shaft is open, and the mine is ventilated by natural wind pressure, and personnel work at high places above or near the mouth of the air shaft, posing safety hazards;

[0006] 2) The height of the counterweight from the ground is generally more than 2 meters, and there are potential safety hazards for personnel working below;

[0007] 3) The weight of each counterweight is generally about 50kg, and it must be removed symmetrically from two or four sets of counterweight assemblies at the same time, otherwise the door body of the explosion-proof door will be tilted, which is troublesome to operate and requires many people to work at the same time. Cooperate well, increase the labor intensity of workers and easily lead to safety accidents;

[0008] 2. The process of locking the explosion-proof door is complicated, requires many miners, and takes a lot of time:

Therefore, if the anti-wind time is not delayed, it is necessary to prepare enough manpower and skillfully press the lock. This is quite difficult and there are too many uncontrollable factors.

[0011] 3. The explosion-proof door cannot be lifted smoothly and synchronously

[0012] In actual operation, due to the influence of external wind force, wire rope friction, explosion-proof door processing quality, daily maintenance and other factors, the rising and falling of the explosion-proof door cannot be guaranteed to be stable and synchronized, and it is very easy to cause jamming, skewing and out-of-synchronization

[0013] 4. After the explosion-proof door of the mine is opened when the fan stops running, the fan cannot be automatically closed when it is restarted. It needs to be closed manually, and the speed is slow, which affects the normal operation of the ventilation system.

[0014] 5. An explosion accident occurred in an air shaft service area of ​​Duofengjing Coal Mine. The explosion-proof door (cover) could not be automatically reset after it was opened and released. The well fan does not stop running, but because the negative pressure inside and outside the well shaft disappears due to the opening of the explosion-proof door (cover), due to the action of other air wells, the air well becomes an air intake well, and the poisonous and harmful gases generated by the explosion in the area served by the air well , with the turbulent wind flow caused by other wind wells, it spreads to the area served by other wind wells, thus causing the areas served by other wind wells to be harmed by explosion accidents

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