Method for proportioning pump constant power control for bedding-in hydraulic machine

Abstract

The invention discloses a method for proportioning pump constant power control for a bedding-in hydraulic machine. The method comprises the following steps: (1) in the working process of the bedding-in hydraulic machine, a proportioning pump changes an opening of a valve core through an amplification plate according to process motions so as to output different flows, so that the descending running speed and beat of a sliding block are guaranteed, and a control module judges whether the motor should undergo constant power control; (2) the control module reads power signals of an instrument; if the actual power P of the motor is equal to or exceeds the rated power P0 and the time exceeds 0.3 s, the step (3) is executed, and if the actual power P of the motor is smaller than the rated power P0, a step (4) is executed; (3) the control module collects pressure information of the sliding block through a pressure sensor, the proportioning pump flow is output according to the constant power control method, power=pressure*flow(P=P*Q), the pressure of the sliding block goes on rising while the speed is continuously slowed down, so that the rated power value of the motor is guaranteed, and the workpiece pressing forming motions are finished; and (4) the sliding block enters pressure maintaining and follow-up process motions.

Description

technical field [0001] The invention relates to the technical field of presses, in particular to a constant power control method of a proportional pump used for researching and distributing hydraulic presses. Background technique [0002] With the rapid development of hydraulic press technology, the research and distribution hydraulic press has a wide range of applications and market prospects in the development of molds in automobiles and other industries. The use efficiency of the proportional pump in the traditional research and distribution hydraulic press design is always limited, and only the limited flow rate is used. The method is used to prevent the overcurrent of the motor, which does not give full play to the advantages of the proportional pump in control. Applying the constant power control of the proportional pump to the research and distribution hydraulic machine can not only prevent overcurrent, but also reduce the design and production costs. In this way, the...

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Problems solved by technology

[0002] With the rapid development of hydraulic press technology, the research and distribution hydraulic press has a wide range of applications and market prospects in the development of molds in automobiles and other industries. The use efficiency of the proportional pump in the traditional research and distribution hydraulic press design is always limited. The method is used to prevent the overcurrent of the motor, which does not give full play to the advantages of the proportional pump in control. Applying the constant power control of the proportional pump to the research and distribution hydraulic machine can not only prevent overcurrent, but also reduce the design and production costs.

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