Supporting pressure closed-loop control system and method for hydraulic forging press

A technology of supporting pressure and closed-loop control, applied in the field of forging hydraulic presses, can solve problems such as rigidity, and achieve the effect of stable supporting pressure and avoiding impact

Active Publication Date: 2016-04-06
TIANJIN TIANDUAN PRESS CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

The traditional forging hydraulic press overcomes the self-weight of the slider through the design of the hydraulic circuit, and realizes the support of the downward movement of the slider. This open-loop control method is relatively rigid in the switching pro...
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Abstract

The invention discloses a supporting pressure closed-loop control system and method for a hydraulic forging press. The supporting pressure closed-loop control system comprises a pressure sensor, a programmable logic controller and a proportional servo valve. The pressure sensor is used for collecting a sliding block supporting pressure datum in a sliding block oil cylinder lower cavity. The programmable logic controller compares the input oil cylinder pressure datum with a set supporting pressure datum and outputs a control instruction through a modified proportion integration differentiation (PID) control algorithm. The proportional servo valve is used for receiving the control instruction to achieve control over the supporting pressure of the sliding block lower cavity of the hydraulic forging press. An input port of the programmable logic controller is in electric connection with the pressure sensor. An output port of the programmable logic controller is in electric connection with an input terminal of the proportional servo valve. According to the supporting pressure closed-loop control system and method, the modified PID control algorithm is led into the pressure closed-loop control system of forging, so that the stability of the sliding block supporting pressure of the hydraulic forging press at different tonnage and working speed is improved.

Application Domain

Forging press drives

Technology Topic

Pid control algorithmLoop control +11

Image

  • Supporting pressure closed-loop control system and method for hydraulic forging press
  • Supporting pressure closed-loop control system and method for hydraulic forging press

Examples

  • Experimental program(1)

Example Embodiment

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:
[0021] See figure 1 , A forging hydraulic press support pressure closed-loop control method, the forging hydraulic press is a forging hydraulic press equipped with a pressure sensor and a proportional servo valve. In this specific embodiment, the nominal force of the forging hydraulic press is 150 mm/s under 33.3 MN. The working speed at a nominal force of 66.6MN is 75mm/s, and the working speed at a nominal force of 100MN is 55mm/s. The pressure closure control system includes: pressure sensor 1, programmable controller 2, and proportional servo valve 3. ; Among them: pressure sensor 1 is used to collect the slider support pressure data in the lower cavity of the slider cylinder; the programmable controller 2 is used to compare the input oil pressure data with the set support pressure data by the programmable controller. Improved PID control algorithm to output control instructions; proportional servo valve 3 is used to receive control instructions to realize the control of the support pressure of the slider lower cavity of the forging hydraulic press;
[0022] The connection relationship between the above-mentioned components is: the input port of the programmable controller 2 is electrically connected to the pressure sensor 1, and the output port of the programmable controller 2 is electrically connected to the input terminal of the proportional servo valve 3.
[0023] See figure 2 The working process of the present invention is: the user sets the support pressure of the slider, the pressure sensor collects the slider support pressure data in the lower cavity of the slider cylinder, and the programmable logic controller sets the support pressure according to the input oil pressure data The data is compared, and the improved PID control algorithm is used to output control instructions. The proportional servo valve receives the control instructions to control the support pressure of the slider lower cavity of the forging hydraulic press. The actual support pressure under the control of the proportional valve is transmitted to the programmable as a feedback signal. Logic controller, in which the change of the hydraulic system oil of the slider during the movement is regarded as a disturbance signal, and the disturbance signal is different under different tonnages and speeds.
[0024] The embodiments of the present invention have been described in detail above, but the content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equal changes and improvements made in accordance with the scope of the application of the present invention should still fall within the scope of the patent of the present invention.
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Description & Claims & Application Information

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