Elevator speed regulator

Abstract

The elevator governor comprises a sheave 11 with a governor rope 10 wound therearound which is driven by a car 3 to be elevated / lowered in a hoistway 2, a first working body 16 which is coaxially fixed to the sheave and has a rotating face 16F formed of a dielectric material, a second working body 18 held by an elastic material with permanent magnets 19A and 19B installed facing the rotating face, a switch operation means 24 which is operated by the displacement of the second working body when the elevating / lowering speed of the car reaches the first set value and operates a switch for stopping the car, and a holding body operation means 23 which is operated by the displacement of the second working body when the elevating / lowering speed of the car reaches the second set value and operates a holding body 21 to hold the governor rope.

Description

technical field [0001] The invention relates to an elevator speed governor, in particular to an elevator speed governor which performs multi-level detection on the speed of an elevator car moving up and down in an elevator passage to control the lifting speed of the elevator car. Background technique [0002] As disclosed in Patent Document 1, a technical solution of an elevator governor has been proposed. In this elevator governor, in order to control on the elevator car the The speed is detected, the circular plate is rotated by the interaction between the permanent magnet and the guide rail as a dielectric body, the centrifugal force generated by the rotation of the circular plate is used to displace the adjusting hammer, and the speed is detected by using the displacement of the adjusting hammer . [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-335848 (paragraph numbers 0013-0016) [0004] According to the prior art, during the lifting proces...

AI Technical Summary

Problems solved by technology

[0004] According to the prior art, during the lifting process of the elevator car, the magnetic flux of the permanent magnet is used to generate an eddy current on the guide rail as a dielectric body, and through the interaction between the eddy current and the magnetic flux of the permanent magnet, the permanent A rotating torque is generated on the magnet, and the circular plate pivotally supporting the adjusting hammer is rotated by the rotating torque. However, it is difficult to achieve high-precision and stable detection of the speed of the elevator car by the above-mentioned method.

[0005] The reason is that due to the influence of factors such as rolling operations and materials in the guide rail manufacturing process, there will be subtle differences in the conductivity and magnetic permeability of the guide rail. In this way, it is difficult to ensure that the entire guide rail installed on the entire length of the lifting channel have the same conductivity and permeability on

As a result, the rotation torque generated by the above-mentioned interaction may deviate, which may cause deviation in speed detection.

[0006] Moreover, when laying the guide rail, due to the accuracy of the centering work and the change in the gap between the permanent magnet and the guide rail, the detection accuracy of the speed may also be deviated.

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