Electro-hydraulic numerical-control synchronous bending machine hydraulic system controlled by double servo pumps

Abstract

The invention discloses an electro-hydraulic numerical-control synchronous bending machine hydraulic system controlled by double servo pumps. The electro-hydraulic numerical-control synchronous bending machine hydraulic system comprises a speed increasing cylinder, an oil return way, a first oil way, a second oil way and a third oil way. A liquid filling valve is arranged on the oil return way. One end of the oil return way is connected with the speed increasing cylinder, and the other end of the oil return way is connected with an oil tank. The first oil way is provided with a first reversingvalve. One end of the first oil way is connected with the speed increasing cylinder, and the other end of the first oil way is connected with the oil tank. One end of the second oil way is connectedwith the speed increasing cylinder, and the other end of the second oil way is connected with the first reversing valve. The second oil way is provided with a fast downflow valve, an overflow valve, aone-way valve and a back pressure valve. One end of the third oil way is connected with the first oil way and the second oil way, and the other end of the third oil way is connected with the oil tank. The third oil way is provided with a safety valve. A second reversing valve is arranged between the third oil way and the oil return way. A third reversing valve is arranged between the oil return way and the first oil way. By means of the electro-hydraulic numerical-control synchronous bending machine hydraulic system, the noise reduction effect is achieved; and due to the fact that the temperature of hydraulic oil is controllable, the hydraulic oil is long in service life, and thus the environmental protection effect is achieved.

Description

technical field [0001] The invention relates to an electro-hydraulic numerical control bending machine, in particular to a hydraulic system of a dual-servo pump-controlled electro-hydraulic numerical control synchronous bending machine. Background technique [0002] Electro-hydraulic CNC bending machine is one of the indispensable equipment in the sheet metal manufacturing industry. The quality of the product depends on the control accuracy of the machine tool, and the production efficiency depends on the speed of the machine tool. [0003] Nowadays, each cycle of the CNC bending machine can be divided into six processes: fast down, work forward, pressure holding, pressure relief, return, and stop. In each working process, the pressure and speed provided to the hydraulic system are also different. The traditional CNC bending machine hydraulic system is provided by an ordinary three-phase asynchronous motor (speed can not be adjusted) and a quantitative hydraulic pump to pro...

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Problems solved by technology

The traditional CNC bending machine hydraulic system is provided by an ordinary three-phase asynchronous motor (speed can not be adjusted) and a quantitative hydraulic pump to provide pressure and hydraulic oil volume, but in the entire cycle of the machine tool (including the machine tool stop state), Driven by a constant high-speed motor, the oil pump continuously supplies pressure oil to the hydraulic system, but in each cycle, only when the motor is working and returning, the motor does useful work, and the rest of the hydraulic oil is overflowed through the electric ratio The valve flows back to the tank, the motor is doing useless work

In the whole process, useless work accounts for about 2 / 3. At this time, the hydraulic oil temperature rises rapidly and the oil temperature is high, which not only affects the service life of the hydraulic oil, but also has an adverse effect on the hydraulic system.

[0004] In the whole cycle of the traditional electro-hydraulic CNC synchronous bending machine, compared with the hydraulic system of the dual-servo pump-controlled electro-hydraulic CNC synchronous bending machine, it has low efficiency, high energy consumption, high noise, and is not environmentally friendly.

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