Electrohydraulic control system for rotation motion of pipe splicing machine

Abstract

The invention discloses an electrohydraulic control system for rotation motion of a pipe splicing machine. The electrohydraulic control system comprises a motor, a constant displacement pump, three overflow valves, an oil return pipe, two three-position four-way proportional reversing valves, a hydraulic lock, a hydraulic motor, a force moment and rotating speed sensor and two pressure sensors. Since the electrohydraulic control system disclosed by the invention adopts the two three-position four-way proportional reversing valves to carry out independent control on the flow of an oil inlet of the hydraulic motor and the backpressure of an oil return port of the hydraulic motor; by controlling the backpressure of the oil return port of the hydraulic motor during an accelerated motion process, a constant motion process and a decelerated motion process of the rotation motion of the pipe splicing machine, the acceleration during the accelerated motion process of the rotation motion of the pipe splicing machine can be increased, the energy consumption during the constant motion process of the rotation motion of the pipe splicing machine and the speed fluctuation under the action of external load variation interference can be reduced, and the stability and the locating accuracy during the decelerated motion process of the rotation motion of the pipe splicing machine can be increased, so that the dynamic characteristic and the stability accuracy of the electrohydraulic control system for the rotation motion of the pipe splicing machine can be increased.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to an electro-hydraulic control system for the rotary motion of a segment assembly machine of a shield tunneling machine. Background technique [0002] The shield tunneling machine is a large and complex excavation equipment used in the construction of non-hard rock geological tunnels. It can realize factory-like and automated operations in the steps of excavation, support, slag discharge, and lining during tunnel construction. Compared with the tunnel construction method using manual excavation, shield tunnel construction is not only safe and efficient, but also greatly improves the quality of the tunnel and reduces the impact on the surrounding environment of the tunnel. Therefore, more and more tunnels use shield tunneling. Tunneling machine for excavation. [0003] The segment assembly machine is a key component of the shield tunneling machine. It is mainly responsible for splicing ...

AI Technical Summary

Problems solved by technology

The current rotary motion electro-hydraulic control system of the segment assembly machine adopts a single proportional valve to control the flow rate entering the oil inlet port of the hydraulic motor driven by the segment assembly machine to control the motor speed. The two linked throttle ports are connected, so the pressure of the oil return port of the hydraulic motor cannot be independently controlled. During the acceleration stage of the rotary motion, the throttle port of the oil return port of the hydraulic motor is too small to cause a large pressure on the oil return port of the motor. The back pressure of the rotary motion limits the acceleration ability of the rotary motion, making the acceleration process of the rotary motion slow; in the deceleration stage of the rotary motion, it is also impossible to control the back pressure of the oil return port of the motor to make the segment assembly machine stop smoothly and accurately

On the other hand, the balance valve used for deceleration and positioning in the rotary motion electro-hydraulic control system of the current segment assembly machine further reduces the The dynamic characteristics, stability and positioning accuracy of the rotary motion electro-hydraulic control system of the segment assembly machine were studied

Therefore, there is still a lot of room for improvement in the electro-hydraulic control system of the rotary motion of the current segment assembly machine

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