Electrohydraulic servo oil cylinder and numerical control machine tool using same

Abstract

The invention relates to an electro-hydraulic servo cylinder, comprising a four-edge sliding valve whose base is mounted with a valve element moving left and right. The valve base is fixed on the cylinder whose piston rod is fixed with the frame; the cylinder is connected with the load. The left driving chamber via tube is communicated with the left working chamber, while the right driving chamber via tube is communicated with the right working chamber; one end of valve element is engaged with the dial block mounted on the straight motion output element of straight motion output device. The digit-control machine with said electro-hydraulic servo cylinder comprises a first axle servo driving system, a second axle servo driving system, a third axle servo driving system and a digit-control system, wherein, the second driving system comprises a straight load axle. The invention has high accuracy, quick steering speed, and stable property, which combines the digit control technique with the electro-hydraulic servo motion, with high accuracy in large power.

Description

technical field [0001] The invention relates to an electro-hydraulic servo oil cylinder and a numerical control machine tool using the electro-hydraulic servo oil cylinder. Background technique [0002] The four-side slide valve is a well-known valve used to control the reversing and speed regulation of various hydraulic actuators including oil cylinders. It has the advantages of simple structure, fast reversing speed, and stable working performance. However, the motion accuracy of the oil cylinder controlled by the existing four-side slide valve is low, which cannot meet the needs of various equipment requiring high-precision motion, and has no servo follow-up function. The linear drive of the executive parts of various existing CNC machine tools is generally realized by the ball screw driven by the servo motor, but for those heavy-duty machine tools and most forging machine tools, the driving power of the executive parts will be as high as several hundred kilowatts As men...

AI Technical Summary

Problems solved by technology

However, the motion precision of the oil cylinder controlled by the existing four-side slide valve is low, which cannot meet the needs of various equipment requiring high-precision motion, and there is no servo follow-up function

The linear drive of the executive parts of various existing CNC machine tools is generally realized by the ball screw driven by the servo motor, but for those heavy-duty machine tools and most forging machine tools, the driving power of the executive parts will be as high as several hundred kilowatts As mentioned above, if a servo motor of more than several hundred kilowatts is directly used to drive the relevant execution parts, due to various factors such as the large moment of inertia of the rotor of the large servo motor, the motion accuracy of the machine tool is difficult to meet the needs of use.

In addition, the use of high-power servo motors will sharply increase the cost of machine tools

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