A multi-hydraulic cylinder synchronous control system and its control method

Abstract

The invention discloses a synchronous control system and a control method for multiple hydraulic cylinders. The control system comprises a controller, a reversing valve, at least two hydraulic cylinders, a hydraulic control one-way valve, digital throttling valves, a servo valve and displacement sensors. Whether the differential value of displacement between the driving hydraulic cylinder and the driven hydraulic cylinders is in a preset synchronous displacement deviation range is monitored, the digital throttling valves are controlled to adjust the flow that correspondingly flows into or flows out of a rod cavities of the driven hydraulic cylinders, and the servo valve is controlled to correspondingly add oil into or release oil out of the rod cavities of the driven hydraulic cylinders, so that rough synchronous movement and accurate synchronous movement between a driving hydraulic cylinder and driven hydraulic cylinders are conveniently and rapidly realized; the synchronization precision is controlled according to applications need, and influences of the manufacture accuracy of the hydraulic cylinders on synchronization precision can be avoided. Besides, the system and the method have the advantages of simple structure, high response speed, stability and reliability in operation, good safety and the like.

Description

technical field [0001] The invention relates to a multi-hydraulic cylinder synchronous control system and a control method thereof, belonging to the technical field of hydraulic control. Background technique [0002] At present, the multi-hydraulic cylinder synchronization system is mainly used in the process of product forming, stretching, punching and mold manufacturing. The synchronous control of the hydraulic system is to ensure that at least two hydraulic cylinders maintain the same displacement during movement. Theoretically, synchronous movement can be guaranteed if an equal amount of liquid is input to multiple hydraulic cylinders with the same working area. ensure. With the rapid development of modern industry, the requirements for machining accuracy are getting higher and higher. In order to overcome or reduce the factors that affect the synchronization of multiple hydraulic cylinders, we need to take compensation measures to eliminate accumulated errors. The tr...

AI Technical Summary

Problems solved by technology

The traditional multi-hydraulic cylinder synchronous control system generally adopts mechanical synchronization or the use of synchronous valves, synchronous cylinders, synchronous motors, etc. Although mechanical synchronization is stable, it is bulky, and the synchronization accuracy is mainly affected by manufacturing accuracy and structural rigidity; Although the synchronous valve control is simple in control and low in cost, its biggest disadvantage is low precision, poor anti-eccentric load capability, repeated adjustments, and unsatisfactory synchronous control. It is only suitable for places with low synchronous requirements; synchronous cylinder is volume Synchronization, high synchronization accuracy, strong anti-eccentric load capability, but its biggest disadvantages are large volume, limited installation, small flow rate, and difficulty in replenishing oil; synchronous motors are also volumetric synchronous, with strong anti-eccentric load capability and good synchronization performance. It has strong anti-pollution ability, but it is bulky and expensive, and its speed must be within a certain range, so that its use is limited

Images