Electric screw overtravel automatic safe protective device

Abstract

The invention relates to a safety protection device for engineering parts. An over-stroke automatic safety protection device for electric screw rod comprises a screw rod, a screw nut and a guide key. The invention is characterized in that an elastic screwed damping body is respectively equipped at two ends of the screw rod, a screw nut anchor ear is fixed on the screw nut and connected with the flange of a expansion rod, and a one-way stopping spacing pin is disposed on the housing and respectively corresponding to the two ends of the screw rod; when the screw nut locates at the limiting positions on the two ends of the screw rod and is stopped by the elastic screwed damping body so as to be in locking state, the screw nut anchor ear contacts with the guide key, and the screw nut and screw nut anchor ear rotate together with a screw mandrel; when the screw mandrel reversely rotates into a positioning groove on the circumferential surface of the screw nut anchor ear in which the one-way stopping spacing pin at this end is embedded, the locking state of the screw nut and screw rod is released, and a guide groove or guide notch on the circumferential surface of the screw nut is just flush with the guide key or a guide bulge. The invention solves can effectively prevent rapid abrasion of parts due to continuous trackslip without using conventional stroke switch, sensor and other electrical devices and elements.

Description

Technical field: [0001] The invention relates to a safety protection device for engineering parts, in particular to an automatic safety protection device for overtravel of an electric screw. Background technique: [0002] The electric screw is a kind of forward and reverse rotation movement of the screw driven by the motor directly or through the speed change mechanism by using the screw principle, and is transformed into a reciprocating straight line of a telescopic rod sleeved outside the screw under the guidance of the guide key through the nut engaged with the screw. Tool for movement. In order to prevent excessive rotation of the screw, causing the nut to move beyond the specified stroke, thereby damaging the equipment, an over-travel safety protection device is also installed on the electric screw. [0003] So far, there are basically two types of overtravel safety protection devices used in screw transmission, one is a protection device composed of a travel switch or...

AI Technical Summary

Problems solved by technology

[0004] The present invention is to provide an over-travel automatic safety protection device for an electric screw, which solves the technical problem of not using traditional travel switches, sensors and other electrical components and circuits, and at the same time effectively avoiding the rapid wear of parts caused by continuous sliding.

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