Shear hydraulic system

Abstract

The invention discloses a hydraulic system of a shearing machine. The output ends of the group are respectively connected with the system pressure control block, the input end of the pressure cylinder control valve block, and the input end of the main hydraulic cylinder control valve block. The rear chambers of each pressing cylinder are connected, the output end of the control valve block of the master hydraulic cylinder is connected with the rear chambers of a pair of master hydraulic cylinders, and the piston rod ends of a pair of master hydraulic cylinders are respectively connected with the upper side of the tool rest. The invention has the advantages of simple structure, convenient operation and reduced manufacturing cost. When the shearing force is continuously increased, several pressing cylinders are in a pressure-holding state; If the force is no longer increased, will there be any indentation on the surface of the material to be sheared, which improves the surface quality of the material to be sheared.

Description

technical field [0001] The invention relates to a shearing machine, in particular to a hydraulic system of a plate shearing machine, and belongs to the technical field of pressure processing. Background technique [0002] When the shearing machine is cutting the plate, if the pressing force is not enough, the sheared plate will be displaced during the shearing process, especially at the end of the shearing, the displacement will be more obvious, which will increase the size deviation of the sheared plate. If the pressing force is too large, the surface of the sheared sheet will be indented, and the load of the pressing cylinder on the frame and the pressing beam will be increased. In order to ensure the strength and rigidity of the frame and the pressing beam, only increase The cross-sectional area of ​​the large frame and the binder beam increases the overall weight of the shearing machine and increases the manufacturing cost of the shearing machine. [0003] CN2818031Y Ch...

AI Technical Summary

Problems solved by technology

[0002] When the shearing machine is shearing, if the pressing force is not enough, the sheared plate will be displaced during the shearing process, especially at the end of the shearing, the displacement will be more obvious, which will increase the size deviation of the sheared plate

If the pressing force is too large, the surface of the sheared sheet will be indented, and the load of the pressing cylinder on the frame and the pressing beam will be increased. In order to ensure the strength and rigidity of the frame and the pressing beam, only increase The cross-sectional area of ​​the large frame and the binder beam increases the overall weight of the shearing machine and increases the manufacturing cost of the shearing machine

[0003] CN2818031Y Chinese invention patent discloses a gate type shearing machine hydraulic system, the control valve of the hydraulic system includes 2 two-position three-way electromagnetic reversing valves, two two-position two-way electromagnetic reversing valves as poppet valves and One two-position four-way electromagnetic reversing valve of the one-way valve group, as well as pressure reducing valve, hydraulic control one-way valve, balance valve and oil pressure relay. In addition to the integrated valve group, there are 14 individual valves in total. Many, complex structure, many hidden trouble points

However, when the gate shearing machine is working, the oil pressure of the system will further increase with the deepening of the shearing. Since the pressure reducing valve is proportionally decompressed, when the input oil pressure increases, the output oil pressure will increase. The pressure will also increase, resulting in excessive pressing force, and indentation will occur on the surface of the sheared sheet, which will affect the surface quality of the sheared sheet

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