Anti-bending device for protective tube of long-stroke sensor for hydraulic cylinder

Abstract

The invention relates to an anti-bending device for a protective tube of a long-stroke sensor for a hydraulic cylinder. An anti-bending piston, which is used for dividing a rodless cavity of the hydraulic cylinder into a cavity A and a cavity B, is arranged between a piston and the bottom of the hydraulic cylinder. An oil passing channel I and an oil passing channel II which enable the cavity A and the cavity B to be communicated are formed. A guide block and an ejector block device for controlling the on and off of the oil passing channels are arranged in the anti-bending piston. When an ejector block of the ejector block device is in the original state, under the action of spring pressure, an ejector rod seals the oil passing channel I and the oil passing channel II, so that the cavity A and the cavity B are not communicated. When the anti-bending piston moves to a half of the cylinder stroke, the ejector rod touches a boss on the protective tube to push the ejector block out. The oil passing channel I and the oil passing channel II are opened, so that the cavity A and the cavity B are communicated. Oil is filled into the cavity B, so that the piston is pushed to continuously move forwards. Therefore, at the moment, the anti-bending piston stops moving because the boss props the guide block and supports the middle of the protective tube so as to prevent the protective tube from being bent due to gravity action.

Description

technical field [0001] The invention belongs to the technical field of hydraulic cylinders, and relates to a sensor protection tube anti-bending device installed in a long-stroke hydraulic cylinder with a displacement sensor. Background technique [0002] The displacement sensor makes the hydraulic cylinder intelligent and informatized, which helps to greatly improve productivity. However, the sensing rod of the displacement sensor is relatively fragile and easily damaged. During use, especially in long-stroke hydraulic cylinders, a protective tube needs to be added to prevent the sensor from being damaged during operation due to the bending of the sensing rod itself due to its own gravity. ; But when the stroke of the hydraulic cylinder exceeds a certain length, the protection tube will also bend. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a long-stroke sensor protection tube a...

AI Technical Summary

Problems solved by technology

However, the sensing rod of the displacement sensor is relatively fragile and easily damaged. During use, especially in long-stroke hydraulic cylinders, a protective tube needs to be added to prevent the sensor from being damaged during operation due to the bending of the sensing rod due to its own gravity. ; But when the stroke of the hydraulic cylinder exceeds a certain length, the protection tube will also bend

Images