Novel digital hydraulic servo cylinder

Abstract

The invention provides a novel digital hydraulic servo cylinder. The novel digital hydraulic servo cylinder comprises a front end cover, a cylinder body, a piston rod, a screw rod, a slide valve core,sealing parts, a rear end cover, a motor seat and a motor, wherein the cylinder body is hollow and is provided with a cavity, the front end cover and the rear end cover are provided with center holescorrespondingly, the piston rod comprises a piston rod body and a piston head, the diameter of the piston rod body is slightly less than that of the center hole of the front end cover, the diameter of the piston head is slightly less than that of the cavity of the cylinder body, an inner hole of the slide valve core is machined with threads, the threads are matched with the screw rod to form a screw pair, an internal through hole of the screw rod communicates with an oil box through an oil return hole, the motor seat is fixed to the rear end cover, and the motor is installed to the motor seat. By means of the novel digital hydraulic servo cylinder, speed control and position control of a traditional complex hydraulic servo cylinder are changed into the simple minitype digital motor control, the one-to-one correspondence between digital pulse frequency and oil cylinder speed and the one-to-one correspondence between digital pulse total amount and cylinder stroke are realized, and the structure of the servo hydraulic cylinder is greatly simplified.

Description

technical field [0001] The invention relates to a novel digital hydraulic servo cylinder. Background technique [0002] In hydraulic transmission, it is often necessary to precisely control the speed and position of the cylinder. The traditional method is to use servo valves or proportional valves, sensors built into the cylinder, and a computer control system for high-speed sampling and calculation, through complex control algorithms and strategies. Realize the precise speed control and position control of the oil cylinder. Although this large-scale closed-loop servo control system is fast and accurate in position control and speed control, it has the defects of complex system structure and inconvenient use and maintenance. [0003] In this regard, in recent years, a servo hydraulic cylinder or digital hydraulic cylinder that integrates proportional valves, servo valves or digital valves on the cylinder has been developed. However, since both valves and sensors need to occ...

AI Technical Summary

Problems solved by technology

Although this large-scale closed-loop servo control system is fast and accurate in position control and speed control, it has the defects of complex system structure and inconvenient use and maintenance.

[0003] In this regard, in recent years, a servo hydraulic cylinder or digital hydraulic cylinder that integrates proportional valves, servo valves or digital valves on the cylinder has been developed. However, since both valves and sensors need to occupy enough space, servo hydraulic cylinders or The size and length of the digital hydraulic cylinder are relatively large, which is not suitable for the transformation and upgrading of the original equipment, and it is difficult to manufacture and expensive

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