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Hydraulic cylinder low-pressure linear output realizing method

A linear output and realization method technology, applied in the hydraulic field, can solve the problems of high cost, waste of material resources, low control precision, etc., and achieve the effect of facilitating upgrading, less system changes and high control precision

Inactive Publication Date: 2009-06-10
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This structure is simple but the control precision is relatively low
With the development of engineering technology, when it is necessary to realize the requirements of dynamic control and analog output, the current ordinary hydraulic system can no longer meet the requirements.
Although the servo system digital system can meet the above functional requirements, if the servo system is used to replace the current hydraulic system, the cost is too high, and the control is more complicated, which will also cause a lot of waste of material resources.

Method used

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  • Hydraulic cylinder low-pressure linear output realizing method

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Embodiment Construction

[0014] In this embodiment, a magnesium alloy plate deep drawing test machine is selected.

[0015] Due to the poor formability of magnesium alloy sheet at room temperature, it needs to be heated to a certain temperature range before it can be drawn. However, as the temperature increases, the strength of the material decreases. The required blank-holding force and deep-drawing force are relatively small, and most of the required blank-holding force in the deep-drawing process is less than 1 ton. Since the tonnage of the hydraulic cushion cylinder of the hydraulic press is 40 tons, and the minimum controllable pressure is 4 tons, it is necessary to improve the hydraulic cushion system of the hydraulic press.

[0016] After analysis, the main cause of the excessively high minimum pressure is the opening pressure of the valve in the hydraulic system. When the hydraulic valve is working normally, the hydraulic pressure in the system has already made the piston of the hydraulic cyl...

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Abstract

The present invention relates to a method used in the field of hydraulic technology, in particular, it relates to a hydraulic cylinder low-pressure linear output implementation method. Said method is characterized by that it utilizes hydraulic cylinder proportion regulation method, when the hydraulic cylinder is worked, it can simultaneously apply pressure to upper and lower two faces of the piston of hydraulic cylinder, and utilizes the pressure difference of upper and lower two cavities of the hydraulic cylinder to produce working pressure so as to implement low-pressure high-accuracy control of hydraulic cylinder. Besides, said invention also provides the concrete steps for implementing said method.

Description

technical field [0001] The invention relates to a method used in the technical field of hydraulic pressure, in particular to a method for realizing low-pressure linear output of a hydraulic cylinder. Background technique [0002] The hydraulic cylinder is a machine that converts the hydraulic pressure generated by the hydraulic system into mechanical motion or force. When the hydraulic cylinder is working, the proportional adjustment system can linearly adjust the working pressure within a certain range, but it is restricted by the working characteristics of the general hydraulic valve. The initial working pressure of the system is much higher than the ideal pressure state. Generally, the minimum working pressure of the hydraulic cylinder is about 10% of the maximum tonnage. For example, the minimum controllable pressure of a common 40-ton hydraulic cylinder system is about 4 tons. Pressure values ​​smaller than the minimum tonnage cannot be adjusted precisely. The minimum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B15/20F15B15/14
Inventor 范立坤张平董杰曾小勤丁文江
Owner SHANGHAI JIAOTONG UNIV
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