Mechanical rotational angle super acceleration switching device

Abstract

The invention relates to a mechanical rotational angle super acceleration switching device. External rotation is introduced through a main shaft, a cylindrical cam is installed on the main shaft and forms a hinge pair together with the main shaft, a cam follower and the curved surface of the cylindrical cam form a space cam pair, a driven rod is restrained and is always parallel to the axial direction of the main shaft and a driven disc and the cam follower are respectively fixed at two ends of the driven rod; the driven rod or the driven disc and the main shaft are connected through a sliding sleeve to form an axial sliding pair together; a travel switch is arranged on a stand and match with the driven disc and two ends of an elastic component are respectively connected with the main shaft and the cylindrical cam / the driven disc. In the invention, angular acceleration is converted into displacement by using a mechanical mode, the travel switch is triggered to alarm when the acceleration reaches a set value, and the set value can be adjusted through the weight of the cylindrical cam, the characteristic parameter of the elastic component and / or the position of the travel switch. The design is skillful, economical and reliable, has wide application and can protect a lifted object at the initial uncontrollable stage.

Description

technical field [0001] The present invention relates to the technical field of speed measuring devices, in particular to the technical field of rotating shaft angular acceleration measuring devices, in particular to a mechanical rotating shaft angle over-acceleration switch device, especially a switch capable of identifying dangerous angular acceleration. Background technique [0002] At present, the known rotating shaft angular velocity measuring devices are mainly electronic, and the angular acceleration can be calculated through the electronically measured angular velocity. At present, there is no independent mechanical rotating shaft angular acceleration measuring device on the market, let alone an independent mechanical rotating shaft angular super-acceleration switchgear. [0003] As a protection device, due to reliability reasons, the current potential energy load moves up and down, especially large potential energy loads, such as in many lifting systems such as ports...

AI Technical Summary

Problems solved by technology

[0004] However, after the failure of the potential energy system, the heavy object fell out of control, and the heavy object began to drive the rotation of the system shaft; The falling speed of the object is not high, and the rotation speed of the system shaft is not high, so the overspeed switch cannot recognize that the fault has occurred; When the braking device sends out an alarm signal, the moving speed of the heavy object lifted by the lifting system is extremely high at this time, and the braking torque and energy are both large (kinetic energy is proportional to the square of the speed), and the braking device is often overloaded. However, it is easy to damage and fail. Due to the limitation of the structure, the braking device of some systems can only brake the static load, but the dynamic load mechanism itself cannot satisfy the large impact. At this time, it will lead to major accidents, machine crashes

Therefore, the current lifting system, especially the heavy-duty lifting system, only relies on the safety protection device of the overspeed switch to be defective.

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