Low-speed anti-falling safety device

Abstract

The invention relates to a low-speed anti-falling safety device. According to the low-speed anti-falling safety device, a brake gear is supported by an end cover and a brake drum through a big bearing and a small bearing, and a support is installed on the brake gear; a first centrifugal block and a second centrifugal block are installed on the support through bearings and rest pins, and the two centrifugal blocks are in central symmetry about the rotation center of the safety device; a connecting rod is connected with the tail portion of the first centrifugal block and a pin hole formed in the front portion of the second centrifugal block through hinge pins or bolts, and therefore it is guaranteed that the work positions of the two centrifugal blocks are synchronous; the tail portion of the second centrifugal block is provided with a thrust bolt through a third hinge pin, the thrust bolt is provided with a governing spring in a penetrating mode, and the thrust of the governing spring enables the first centrifugal block to be tightly pressed on the support; a belleville spring and a pressing nut are arranged on a threaded rod located at the end of the outer side of the brake drum, and the pressure of the belleville spring is transmitted to the brake drum through the pressing nut. According to the low-speed anti-falling safety device, through a speed limiting mechanism of the safety device, whether the speed of an operation component of a protected target exceeds a preset value under the low-speed condition can be detected, the safety device can automatically brake the operation component, and therefore low-speed operation of the safety device is achieved.

Description

technical field [0001] The invention belongs to an overspeed protection device for linear and rotary motion mechanical parts, and relates to a low-speed anti-fall safety device, in particular to an anti-fall safety device for a rack-and-pinion lifting work platform and a low-speed construction elevator. Background technique [0002] The anti-drop safety device is the most important safety device in the construction elevator. Its speed limiting mechanism adopts the centrifugal principle. The existing safety device generally adopts the form of a single centrifugal block. When the operating speed of the safety device reaches the preset protection speed, the centrifugal block overcomes the The pre-tightening force of the speed setting spring is thrown out to realize the limited speed triggering. Since the position of the centrifugal block depends on the joint influence of the speed setting spring preload and the self-weight of the centrifugal block, in the case of a low operatin...

AI Technical Summary

Problems solved by technology

Since the position of the centrifugal block depends on the joint influence of the speed setting spring preload and the self-weight of the centrifugal block, when the operating speed of the safety device is low, the proportion of the centrifugal force to the self-weight of the centrifugal block is small, and the action speed is affected by the centrifugal force. The weight of the block has a great influence, and it is very unstable when the safety device moves at a low speed, and it is even impossible to realize

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