Hydraulic control system of multi-point driving large hydraulic press
A hydraulic control system and multi-point drive technology, applied in the direction of presses, manufacturing tools, etc., can solve problems such as the inability to guarantee the displacement accuracy of the working master cylinder, the inability of the hydraulic system to achieve active balance, continuous pressurization, and affecting the quality of workpiece processing.
Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV
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Problems solved by technology
[0002] Most of the existing hydraulic systems of multi-point drive large-scale hydraulic presses cannot realize the functions of active balance and continuous pressurization. Ensure the displacement accuracy of each working master cylinder. When the deflection torque is too large, the body of the hydraulic press will be deformed; when the working stroke of the hydraulic press is large, the booster system cannot guarantee the position accuracy of the working cylinders, which will affect the processing quality of the workpiece.
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[0012] The working principle is as follows: the main pump system 6, 7, 14, 15, and 16 are turned on, the filling valves 4, 5, 17, 18, and 19 are turned on, and the return cylinder discharge valve group 22 is turned on (different valves are used according to the descending speed of the movable beam) The combined method realizes slow drop or fast drop), the oil enters the main cylinder from the filling tank 8 through the filling valve, and the movable beam drops rapidly; when the movable beam is close to the workpiece, the main cylinder liquid inlet control valve group 9, 10, 11 , 12, and 13 large-diameter cartridge-type proportional valves are opened, the balance valve 40 of the return cylinder drain valve group 22 is opened, other valve blocks are closed, the system is changed to work, and the master cylinder starts to pressurize. When the central master cylinder is not at the same horizontal position, the feedback signal of the displacement sensor changes the opening amount of...
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The invention relates to a hydraulic control system of a large hydraulic press, which mainly comprises five main cylinder liquid feeding control valve blocks, two horizontal die forging liquid feeding and liquid discharging control valve blocks, a central hole punching control valve block, a return cylinder liquid feeding control valve block, and a return cylinder liquid discharging control valve block. The flow quantity and the pressure of each main cylinder liquid feeding control valve block are respectively controlled through the displacement feedback signals of five main cylinders, thereby the invention realizes the active and synchronous motion control to the main cylinders. Inserting type proportional valve units and continuous pressure charging units are arranged in the main cylinder liquid feeding control valve blocks, so as to meet the loading requirements of different work piece types. The horizontal die forging part adopts the electro-hydraulic proportional controlling and has the continuous pressure charging function, so as to control the movement velocity and the position accuracy of the horizontal cylinders. The different combination modes of the return cylinder liquid feeding control valve block can meet different speed requirements of the fast descending, slow descending and working feed of a movable cross beam during the operation process of the hydraulic press.
Description
technical field [0001] The invention relates to a hydraulic control system for multi-point drive of large-scale equipment, in particular to a hydraulic control system for a large-scale multi-point drive hydraulic machine with active balance and continuous pressurization functions. Background technique [0002] Most of the existing hydraulic systems of multi-point drive large-scale hydraulic presses cannot realize the functions of active balance and continuous pressurization. Ensure the displacement accuracy of each working master cylinder. When the deflection torque is too large, the body of the hydraulic press will be deformed; when the hydraulic press has a large working stroke, the booster system cannot guarantee the position accuracy of the working cylinders, which affects the processing quality of the workpiece. Contents of the invention [0003] In order to realize the active balance and continuous pressurization control functions of the multi-point drive hydraulic p...
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IPC IPC(8): B30B15/24
CPCB30B15/20
Inventor 陈敏湛利华黄明辉刘忠伟周育才邓奕
Owner CENT SOUTH UNIV