An adjustable constant pressure hydraulic device and its working method

By introducing the friction between the slider and the mounting plate and the cooperation of the cylinder in the hydraulic device, and using the friction block of the cylinder driven by the connecting line to lock the position of the output rod, the pressure error problem caused by the inertial return of the output rod is solved, and accurate control of the position of the output rod is achieved.

CN117514953BActive Publication Date: 2026-07-17NANJING VOCATIONAL UNIV OF IND TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING VOCATIONAL UNIV OF IND TECH
Filing Date
2023-11-15
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing adjustable constant pressure hydraulic devices, the output rod position shifts back due to inertia, causing an error between the set pressure value and the actual pressure value. Furthermore, the control valve's delayed closing causes the pressure inside the hydraulic cylinder to be higher than the set pressure.

Method used

By introducing friction between the slider and the mounting plate as resistance in the hydraulic device, combined with the cooperation of the cylinder and the ball, the friction block of the cylinder driven by the connecting line abuts against the friction plate to lock the position of the output rod, ensuring accurate position of the output rod, and compensating for insufficient pressure by delaying the closing of the control valve.

Benefits of technology

It effectively reduces the error between the set pressure value and the actual pressure value, ensures the accuracy of the output rod position, and avoids positional deviation caused by inertial backsliding.

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    Figure CN117514953B_ABST
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Abstract

This invention discloses an adjustable constant pressure hydraulic device and its working method in the field of hydraulic device technology. It includes a control component and a hydraulic cylinder. An output rod is provided at the upper end of the hydraulic cylinder. A limit block is fixedly installed at the upper end of the output rod. A connecting plate is fixedly installed at the upper end of the output rod. Connecting rods are fixedly installed on the lower surfaces of both ends of the connecting plate. A slider is fixedly installed at the lower end of the connecting rod. An mounting plate is fixedly installed on the surface of the hydraulic cylinder near the connecting rod. The slider is slidably connected to the mounting plate. A scale mark is provided on the mounting plate. A connecting ring is fixedly installed between the two sliders. A mounting seat is fixedly installed on the upper surface of the connecting ring. A cylinder is provided inside the mounting seat. A friction block is fixedly installed at the output end of the cylinder. A data acquisition device is provided on the connecting ring. This invention provides a method to lock the position of the output rod in a timely manner, reducing the error between the set pressure value and the actual pressure value during adjustment.
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