Hydraulic damper for elevator

Abstract

The invention provides a hydraulic damper for an elevator capable of reducing whole height. The hydraulic damper for the elevator provided by the invention comprises a hydraulic cylinder and a plurality of plungers. The hydraulic cylinder is vertically arranged in an elevator pit of a lift passage and filled with hydraulic oil. A plurality of plungers are jogged into the hydraulic cylinder in a way of stretching up and down, diameter is gradually reduced from outside to inside, and the plungers are concentrically overlapped with each other. In addition, an orifice for the hydraulic oil to pass through when the plungers drop, a slender conical member, a front end of which is loosely inserted into the orifice, and a returning spring that enables the dropped plungers to return a primary position are arranged in the hydraulic cylinder. In the hydraulic damper for the elevator, the returning spring is composed of a first spring and a second spring in a way of dividing one into two up and down, at the same time, a circular disc with the slender conical member can be arranged between the first spring and the second spring in a way of moving up and down.

Description

technical field [0001] The invention relates to a hydraulic buffer for an elevator. The hydraulic buffer for an elevator is arranged at the bottom of an elevator hoistway. The impact force is moderated with the appropriate deceleration by the hydraulic buffer, so that the elevator stops safely. Background technique [0002] Under normal circumstances, the descending position of the lifting body of the elevator will not exceed the normal stop position of the lowermost floor, but when some abnormality occurs in the elevator, the descending position of the lifting body may exceed the normal stopping position of the lowermost floor. Therefore, in order to alleviate the impact force of the lifting body so that the lifting body can be safely stopped when the above-mentioned abnormality occurs, according to regulations, it is obligatory to install a buffer at the bottom of the hoistway of the elevator. As this kind of shock absorber, there is known a hydraulic shock absorber, whic...

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Problems solved by technology

[0006] However, in the prior art described above, the operating stroke of the conical (conical) control rod has the same value as the stroke of the lowermost plunger, so the value equivalent to twice the stroke is greater than the overall height of the hydraulic shock absorber. Therefore, although it is set in the form of a telescopic sleeve, the height dimension of the hydraulic cylinder part is still large, and it is difficult to say that a sufficient overall height reduction effect has been obtained

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