A hydraulic control device for roll bending system of rolling mill

Abstract

Provided is a hydraulic control device of a rolling bending system of a rolling mill. An oil port A1 of a first servo valve (1) is communicated with an oil port P2 of a first two-position four-way electromagnetic directional valve (2), an oil port A2 of the first two-position four-way electromagnetic directional valve is communicated with a piston cavity of an upper positive bending cylinder (8) and a piston cavity of a lower positive bending cylinder (9), an oil port B1 of the first servo valve is communicated with an oil port P3 of a second two-position four-way electromagnetic directional valve (3) and an oil port P4 of a third two-position four-way electromagnetic directional valve (4), an oil port A3 of the second two-position four-way electromagnetic directional valve is communicated with a piston cavity of an upper negative bending cylinder (7), an oil port A4 of the third two-position four-way electromagnetic directional valve is communicated with a piston cavity of a lower negative bending cylinder (10), an inlet of a pressure reducing valve (6) is communicated with an oil source P, an outlet of the pressure reducing valve is communicated with an oil port P5 of a fourth two-position four-way electromagnetic directional valve (5), and an oil port A5 of the fourth two-position four-way electromagnetic directional valve is communicated with the piston cavities of all the bending cylinders. The device is simple, reasonable and reliable in structure.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control, in particular to a hydraulic control device for a roll bending system of a rolling mill. Background technique [0002] combine figure 1 , the existing rolling mill bending system includes upper negative bending cylinder 7, upper positive bending cylinder 8, lower positive bending cylinder 9 and lower negative bending cylinder 10, the hydraulic control device uses the first servo valve 1 and the second servo valve 12 to simultaneously control the positive The hydraulic circuits of bending cylinder and negative bending cylinder only allow positive roll bending force or negative roll bending force in actual use, and do not allow positive roll bending force and negative roll bending force to exist at the same time. [0003] The positive roll bending force is realized in this way, the oil port P1 to A1 of the first servo valve 1 is connected, and the pressure oil flows from the A1 port into...

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Problems solved by technology

[0004] In addition, the servo valve is a precision component, and the price is relatively expensive. If the servo valve fails during use, it must be sent to a professional repair factory for repair, and the repair cost is very expensive.

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