Constant speed control method of hydraulic cylinder type actuator and device thereof

Abstract

The invention discloses a constant speed control method of a hydraulic cylinder type actuator and a device thereof. The method comprises the following steps that: a rodless chamber and a rod chamber of a hydraulic cylinder are connected with an electromagnetic directional valve through oil ways respectively, wherein each oil way is provided with a throttling screw plug respectively; an electromagnetic directional valve is connected with an oil supply unit; and an electric proportional overflow valve and an overflow loop are arranged on the oil ways between the electromagnetic directional valve and the oil supply unit; and an electric control system controls the electromagnetic directional valve to control the direction of a piston rod and regulates the input current of the electric proportional overflow valve at the same time to ensure the constant to-and-fro speed of the piston rod. The device comprises the electric control system and the electromagnetic directional valve which is communicated with the rodless chamber and the rod chamber on a bidirectional hydraulic cylinder through the oil ways, wherein the input end of the electromagnetic directional valve is communicated with the oil supply unit; throttling screw plugs are arranged on the oil ways; and the electric proportional overflow valve and the overflow loop are connected in series between the electromagnetic directional valve and the oil supply unit. The invention has the advantages of simple and compact structure, low cost, convenient operation, strong suitability, capability of improving the accuracy of the actuator and the like.

Description

technical field [0001] The invention mainly relates to the field of actuators in mechanical equipment, in particular to a hydraulic cylinder actuator. Background technique [0002] At present, the hydraulic power control system that uses a single-rod two-way hydraulic cylinder as an actuator to realize various actions is widely used in the field of construction machinery. When the piston rod of the hydraulic cylinder is reciprocating, due to the difference in load and the difference in the piston area of ​​the rod chamber and the rodless chamber, the speed of the piston rod extending and retracting will be inconsistent, which makes it difficult for the operating device driven by the piston rod to move. To achieve precise automatic control, or cause a rather complex structure and high implementation costs. When the equipment needs to frequently reciprocate and fine-tune the position of the actuator according to the change of the working environment during the working process...

AI Technical Summary

Problems solved by technology

When the piston rod of the hydraulic cylinder is reciprocating, due to the difference in load and the difference in the piston area of ​​the rod chamber and the rodless chamber, the speed of the piston rod extending and retracting will be inconsistent, which makes it difficult for the operating device driven by the piston rod to move. Realize precise automatic control, or cause quite complicated structure and high implementation cost

When the equipment needs to frequently reciprocate and fine-tune the position of the actuator according to the change of the working environment during the working process, its positioning accuracy is also very low, resulting in poor machine performance

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