Pump and valve coordinated control method used for prestress intelligent tensioning device

Abstract

The invention provides a pump and valve coordinated control method used for a prestress intelligent tensioning device, and belongs to the technical field of engineering construction such as bridge engineering, highways and tall buildings. According to the pump and valve coordinated control method used for the prestress intelligent tensioning device, the problem that control accuracy of an existingtechnology is not high is solved. The prestress intelligent tensioning device, and belongs to the technical field of engineering construction comprises the following steps that a mould of a pump andvalve coordinated control system is established; a loaded flow prediction control algorithm is adopted to a pump control part of the pump and valve coordinated control system, and pump control singleum output is obtained; a feed forward compensation PID control algorithm is adopted by a valve control part of the pump and valve coordinated control system, and valve control single uv output is obtained; the pump control single um and the valve control single uv are input into the pump and valve coordinated control system, and the rotating speed is controlled by a servo motor according to the pump control signal um, so that output flow of oil source is matched with the loaded flow, a stepping motor drives a direction switching valve to work according to the valve control signal uv, and thusadjustment of the loaded flow is realized. According to the pump and valve coordinated control method used for the prestress intelligent tensioning device, the dynamic response and control accuracy ofthe pump and valve coordinated control system can be improved.

Description

technical field [0001] The invention belongs to the technical field of engineering construction such as bridge engineering, expressways, and high-rise buildings, and relates to a pump-valve cooperative control method for prestressed intelligent tensioning equipment. Background technique [0002] The prestressed structure first achieved rapid development in bridge engineering, and now it has penetrated into various fields, such as high-rise buildings, lifting transportation, airstrips, TV towers, road interchange buildings, liquid storage tanks, marine structures, and prestressed concrete structures. It has been applied in ship hull structure, nuclear reactor vessel, special complex structure and so on. Prestressing technology has become an indispensable technology in large-span, large-space structures, high-rise structures, heavy-load structures, special structures, and new structural engineering. [0003] The prestressed intelligent tensioning equipment consists of two jac...

AI Technical Summary

Problems solved by technology

However, there are many defects in the valve control system: the structure of the electro-hydraulic servo valve is complex; it is particularly sensitive to the pollution of the working medium; Low, severe fever, etc.

But the disadvantage is that the moment of inertia of the motor and the oil pump is large, and the operation is not stable at low speed, so the response speed of the pump control system is slow and the control accuracy is low.

In addition, when the pump control system is working, the pressure in the back pressure chamber of the hydraulic actuator is small, resulting in low load stiffness of the pump control system

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