A high-precision hydraulic synchronization system, a jack-raising control method and a section-increasing height increasing method for section-increasing height increasing of a large-scale crane

Abstract

A high-precision hydraulic synchronization system, a jack-raising control method and a section-increasing height increasing method for section-increasing height increasing of a large-scale crane are disclosed. The system includes a jack-raising device, a horizontal latch device, a console, a PLC controller, and a servo motion controller. The jack-raising device includes jack-raising oil cylinders,proportional directional valves, electromagnetic stop valves, pressure sensors and displacement sensors. The PLC controller can control pressure difference data, feedbacked by the two pressure sensors, of two working chambers of the jack-raising oil cylinders. Through control of the proportional directional valves and the electromagnetic stop valves, control of preload force is achieved. According to displacement data feedbacked by the displacement sensors, PID calculation is performed through the servo motion controller, the opening degrees of valve cores of the corresponding proportional directional valves are controlled, and accurate close-loop control of the position of the corresponding jack-raising oil cylinders and the jack-raising speed is achieved. The system and the methods achieve preload force control, can accurately adjust the jack-raising speed, and are high in responsibility, safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of hoisting machinery, and relates to a working platform suitable for raising the standard section of a large tower crane, in particular to a high-precision hydraulic synchronous jacking system, a hydraulic Synchronous jacking control method, hydraulic synchronous jacking and joint lifting method. Background technique [0002] Tower crane is the most commonly used lifting device in construction engineering. The central tower of the tower crane is assembled from several standard sections. At present, the common way to raise the tower crane is to raise the boom through the climbing section installed under the boom. Slightly higher than the height of a standard section, the boom lifts a standard section to the platform outside the climbing section, sends the standard section into the climbing section and connects it to the following standard section, and repeats this to achieve the rise. [0003] Due to struct...

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Problems solved by technology

[0006] The existing hydraulic synchronous jacking system for large-scale tower crane standard section plus section lifting generally uses a balance valve connected to the inlet and outlet of the oil cylinder to prevent the load from falling, and uses a pressure sensor connected to the working chamber of the oil cylinder to monitor the oil supply When the proportional directional valve is used in the system to control the flow of hydraulic oil by adjusting the opening of the spool, the use of the balance valve will affect the movement of the jacking cylinder and interfere with the flow control of the proportional directional valve

Moreover, using a proportional directional valve and a pressure sensor cannot monitor the actual carrying capacity of the jacking cylinder, and cannot achieve control of the preloading force

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