Door closer for normally-open fireproof door

Abstract

The invention discloses a door closer for a normally-open fireproof door. According to the technical scheme, the door closer is characterized in that a vertical plate on an installation frame is hinged to a pawl, the pawl is connected with a transmission mechanism, and a control mechanism is arranged above the transmission mechanism; one end of a pull rod is hinged to the pawl, the other end of the pull rod is sleeved with a compression spring, one end of the compression spring abuts against the pull rod, and the other end of the compression spring abuts against a fixing seat; one end of a swing rod extends upwards to form a swing part, a reset spring is arranged between the swing part and the control mechanism, when the control mechanism drives the swing rod to swing, a bucking part of the swing rod swings downwards to disengage from a notch, the pull rod can slide forwards under the action of the compression spring, and therefore the pawl is driven to rotate relative to the pawl and disengage from a ratchet wheel. According to the door closer for the normally-open fireproof door, the elasticity potential energy of the compression spring can be directly transmitted to the pawl simply through one part of the pull rod, the elastic potential energy conversion efficiency of the compression spring is improved, the structure is simple, the manufacturing cost is lowered, and meanwhile operation is convenient.

Description

technical field [0001] The invention relates to the field of door closers, more specifically, it relates to a normally open fire door closer. Background technique [0002] At present, the existing door closers are normally closed door devices, which are mainly installed on the fire doors that are closed all the year round, and keep the fire doors closed at any time to prevent the fire from spreading through the fire doors when a fire occurs. It is more practical on fire doors with small traffic; however, in public buildings with relatively large flow of people or goods, this kind of door closer often cannot meet the practical requirements. Because people or goods need to pass through the fire doors frequently, people need a lot of time and effort. Opening the fire door by physical force greatly affects the convenience of people passing through. If the fire door is fixed in the open state with tools, the fire will spread quickly through the fire door to the surroundings if th...

AI Technical Summary

Problems solved by technology

[0005] When the connecting rod moves to the right under the action of the elastic potential energy of the return spring, the connecting rod needs to drive the crank to move to the right to drive the pawl to open a certain angle. Since the elastic potential energy of the return spring needs to be transmitted through the connecting rod and the crank, the structure of the transmission mechanism is complicated. , will reduce the transmission efficiency of the elastic potential energy of the return spring, which requires higher requirements for the return spring. If the elasticity of the return spring is insufficient, it will not be able to drive the pawl to open a certain angle. At the same time, the connecting rod and the crank are hinged, and the two are prone to occur. Stuck phenomenon, resulting in the inability to normally drive the pawl to open a certain angle, which is not easy to operate

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