jacking device

Abstract

The invention relates to a jacking device. The jacking device comprises a vertical hydraulic cylinder. The extension end of a piston rod of the hydraulic cylinder is positioned below a cylinder body. A guide sleeve sleeves the cylinder body. The cylinder body and the guide sleeve are arranged coaxially and are in vertical sliding fit. The upper end of the cylinder body is fixedly connected with the plate surface of the lower portion of a guide rail plate. A first oil hole is formed in the piston rod and is communicated with a cavity where the upper end face of the piston is located. The guide sleeve supports and guides the cylinder body to enable the cylinder body to only move up and down along the limiting direction of the guide sleeve, so that scratching is only caused between the outer wall of the cylinder body and the guide sleeve, and damage to mutually matched working surfaces of the piston rod and the cylinder body is avoided; moreover, an opening of the cylinder body is enabled to be positioned at the lower end through downward arrangement of the piston rod, so that sand and metal scraps are prevented from deeply entering the cylinder from a fit clearance between the piston rod and the end of the cylinder, damage to sealing members is avoided, oil leakage of the hydraulic cylinder is further avoided, and working performance of the jacking device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of press equipment for automobile body processing, in particular to a jacking device. Background technique [0002] The volume and weight of the press used in the stamping of automobile bodies are relatively large. Generally, the worktable of the press is set on the guide rail plate to facilitate the movement and reversing of the workbench. The guide rail plate includes the first and second intersecting (usually vertically arranged) two sets of guide rails, how to realize the transition and reversing of the workbench between the two sets of guide rails, those skilled in the art adopt the following scheme: figure 1 As shown, the lower part of the workbench 1 is provided with first and second roller sets 2 and 3, and each of the two sets of roller sets is composed of four rollers in the same plane in the direction of height and height, wherein the direction of the axis of the rollers of the first roller set 2 ...

AI Technical Summary

Problems solved by technology

However, there are a lot of ground sand and metal debris in the actual working environment. During the actual use of traditional hydraulic cylinders, the contact position between the rollers of the mobile workbench and the top support end surface of the hydraulic cylinder is uncertain, resulting in relative hydraulic pressure. Due to the eccentric load between the piston rod of the cylinder and the inner wall of the cylinder, sand and metal debris are easy to fall into the inner wall of the piston and the cylinder body and the position of the through hole between the piston and the cylinder head, and serious scratches will occur in the above two places , leading to damage to the sealing rubber ring, which can easily cause oil leakage. The oil leakage and oil cylinder failure of this type of hydraulic cylinder will not only affect the production efficiency of the enterprise, but also virtually increase the actual cost of the enterprise. Production costs, and even potential accidents such as equipment rollover

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