Large-diameter vertical-shaft flying fin type explosion-proof door

Abstract

The invention provides a large-diameter vertical-shaft flying fin type explosion-proof door, and relates to the field of coal mine downhole ventilation systems. The large-diameter vertical-shaft flying fin type explosion-proof door comprises an outer frame arranged on a wellhead foundation, the cross section of the outer frame is round, the longitudinal section of the outer frame is in a shape ofbeing low in the middle and high in left and right sides, and the positions between the middle and the left side of the outer frame as well as between the middle and the right side of the outer frameare bevel edges correspondingly; a cross beam is arranged on the upper portion of the middle of the outer frame, and door plates are hinged to the left side and the right side of the cross beam correspondingly; a driving shaft and a driven shaft are supported on the upper portion of the cross beam, one end of the driving shaft is connected with a power mechanism, and a set of crank gear connectingrod mechanism is connected to each of the driving shaft and the driven shaft; and each set of crank gear connecting rod mechanism comprises two sector gears, two cranks and two connecting rods; a setof pulley frame is mounted on the wellhead foundation, the pulley frame is located on one side of one of the door plates, a pulley is supported on the pulley frame, and the door plate away from the pulley frame is connected with a steel wire rope; and the steel wire rope passes through the pulley, and the other end of the steel wire rope is connected with a counterweight weight. According to thelarge-diameter vertical-shaft flying fin type explosion-proof door, in-time pressure relief and in-time reset can be achieved, and two door leaves can be opened and closed synchronously.

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...

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Problems solved by technology

[0003] However, there are the following problems in general shaft air shaft explosion-proof doors: 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 time. ②When the main ventilator is powered off and restored, t

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