Hydraulic system for driving middle lower roller of four-roller plate bending machine

Abstract

The invention discloses a hydraulic system for driving middle lower roller of a four-roller plate bending machine. The hydraulic system comprises a first hydraulic station and a second hydraulic station, wherein an oil outlet pipe of the first hydraulic station is connected onto a port P of an electro-hydraulic reversing valve; a port A of the electro-hydraulic reversing valve is connected with two branches, one branch is connected with a reversing valve VII and a lower cavity of a first oil cylinder, and the other branch is connected with a reversing valve VIII and a lower cavity of a second oil cylinder; a port B of the electro-hydraulic reversing valve is connected with two branches, one branch is connected with a throttling valve I and an upper cavity opening of the first oil cylinder, and the other branch is connected with a throttling valve II and an upper cavity of the second oil cylinder; an oil outlet pipe of the second hydraulic station is connected onto a port P of a electromagnet reversing valve, and a port A of the electromagnet reversing valve is connected with an overflow valve I and an upper cavity of a third oil cylinder; the port B of the electromagnet reversing valve is connected with an overflow valve II and a lower cavity of the third oil cylinder. The hydraulic system has the advantages that the gap between the middle lower roller and an upper roller is uniform during processing, so the production of defective products is avoided, and the working efficiency is greatly improved; the functions of reversing and resetting a overturn device are realized, and the operation is automatic.

Description

technical field [0001] The invention relates to the technical application field of plate bending machines, in particular to a hydraulic system driven by middle and lower rolls of a four-roller plate rolling machine. Background technique [0002] The plate rolling machine is specially used for curling and bending cylinders of metal plates. It is one of the main equipments in the boiler, shipbuilding, petrochemical, cement, electrical and machine manufacturing industries. At normal temperature, the four-roller plate bending machine can bend the metal plate into a cylinder or a part thereof, and can bend the end of the metal plate. This is the advantage of the four-roller plate bending machine over the general three-roller plate bending machine. At the same time, the launch of this equipment has greatly reduced the labor intensity of employees and improved corporate efficiency. [0003] In the prior art, the synchronous rise of both ends of the middle and lower rolls is simult...

AI Technical Summary

Problems solved by technology

Due to oil return at both ends at the same time, the size of the gap between the middle and lower rolls and the upper roll is inconsistent, and one side of the steel plate is clamped while the other side is loosened, and finally the processed cylindrical workpiece is large at one end and small at the other end. micro horn shape

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