Limiting shaft on floor spring and manufacturing method thereof

Abstract

The invention provides a limiting shaft on a floor spring and a manufacturing method thereof, belongs to the technical field of floor spring accessories, and solves the problems that an existing limiting shaft is difficult to machine and low in percent of pass. The limiting shaft on the floor spring comprises a shaft body, a first cam and a second cam. a coupling head is arranged at one end of theshaft body; a positioning head is arranged at the other end of the shaft body; a first convex ring and a second convex ring are arranged on the outer side of the positioning head in the axial direction; the outer peripheral surface of the first convex ring comprises a first arc surface and a first straight surface connected between the two ends of the first arc surface; a first matching hole which is the same as the first convex ring in shape is formed in the first cam; the first cam is fixed to the first convex ring through the first matching hole, the outer circumferential face of the second convex ring comprises a second arc surface and a second straight face connected between the two ends of the second arc surface, the second cam is provided with a second matching hole which is the same as the second convex ring in shape, the second cam is fixed to the second convex ring through the second matching hole, and the first straight face and the second straight face are located on the same plane. The limiting shaft on the floor spring has the advantages of high qualification rate, convenience in processing, high positioning precision and the like.

Description

technical field [0001] The invention belongs to the technical field of floor spring accessories, and relates to a limit shaft on a floor spring and a manufacturing method thereof. Background technique [0002] The ground spring is a hydraulic door closer. Its structure is, for example, a door force adjustable multi-stage positioning ground spring disclosed in the application number 201410660425.5. It includes a valve body and a central shaft. The valve body is provided with a valve body cavity and a movable The two ends of the valve body cavity are respectively provided with a piston and a back cover, and a spring is connected between the piston and the back cover. The upper pull-up piece, the main cam, the auxiliary cam and the pull-down piece are arranged in sequence in the movable chamber from top to bottom. There are guide grooves on both the pull-down piece and the pull-down piece. The central axis passes through the guide grooves of the upper pull-down piece and the pu...

AI Technical Summary

Problems solved by technology

However, this integral forging method has very high requirements for processing quality, and it is also very difficult to process, especially a suitable distance between the main cam and the auxiliary cam is required and the distance is relatively small, and the central axis The shapes of both ends and the shape of the main cam and the auxiliary cam are quite special, and there are very high requirements for the selection and use of processing tools. Once a deviation occurs in the processing of a certain position, the entire product will be scrapped, so there is still a qualified low rate problem

Images