Hydraulic system of press machine

Abstract

The utility model discloses a press machine hydraulic system which comprises a working module and a hydraulic driving module, the hydraulic driving module comprises an oil tank, an oil pump, a servo motor, a clasping valve and a jacking valve, an oil inlet of the oil pump is communicated with the oil tank, an oil outlet of the oil pump is communicated with oil inlets of the clasping valve and the jacking valve, and an oil outlet of the servo motor is communicated with an oil outlet of the oil pump. The servo motor drives the oil pump to pump hydraulic oil to the clasping valve and the jacking valve, working oil ports of the clasping valve and the jacking valve are connected to the working module, oil return ports of the clasping valve and the jacking valve are communicated with the oil tank, and the servo motor, the clasping valve and the jacking valve are connected to a PLC (Programmable Logic Controller); a servo motor, an oil pump oil supply system and a touch screen PLC system are adopted for control, the oil pressure and the oil flow of each actuating mechanism in each movement direction are distributed according to needs, different workpiece pressure and position requirements can be matched at will through a touch screen, and the equipment can better meet domestic requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of presses, in particular to a hydraulic system of a press. Background Art

[0002] In many domestic pipe end connections, presses are often used to pre-stamp steel pipes to facilitate the connection of steel pipe fittings. The press's forming principle for steel pipes is to clamp the steel pipe tightly with a clamp, and then use a pneumatic or hydraulic cylinder to push the forming die toward the pipe end to complete the stamping. This type of equipment is mainly monopolized by European and American brands. Because the equipment is a tool and has low industry demand, few domestic manufacturers have developed it. The extremely high price of the equipment is a pain point for customers, and there is no targeted development for domestic users. Compared to the current clamping / clamping method that mostly uses a clamp with a tapered four-petal shape, the use of a direct vertical clamping method is more efficient. At the same time, similar products often use ordinary motors, which cannot easily be fine-tuned and compensated according to the mold and the workpiece to be processed. The entire hydraulic system structure is very complex, so a compatible and energy-saving and efficient hydraulic control system is required. Utility Model Content

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a hydraulic system of a press, which is adapted to the vertical clamping method of the pipe fittings so that the press is more efficient in pressurizing and forming the pipe fittings.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] The utility model provides a hydraulic system of a press machine, including a working module and a hydraulic drive module, the hydraulic drive module including an oil tank, an oil pump, a servo motor, a holding valve and a lifting valve, the oil inlet of the oil pump is connected to the oil tank, the oil outlet of the oil pump is connected to the oil inlet of the holding valve and the lifting valve, the servo motor drives the oil pump to pump hydraulic oil to the holding valve and the lifting valve, the working oil ports of the holding valve and the lifting valve are connected to the working module, the oil return ports of the holding valve and the lifting valve are connected to the oil tank, and the servo motor, the holding valve and the lifting valve are connected to a PLC controller.

[0006] An optimal technical solution of the present utility model is that the holding valve and the lifting valve are three-position four-way solenoid valves; and the hydraulic oil pressure of the oil outlet of the oil pump is 0~25MPa.

[0007] The preferred technical solution of the present utility model is that the working module includes a clamping cylinder and a lifting cylinder. There are two clamping cylinders, and the two clamping cylinders are symmetrical about the lifting direction of the lifting cylinder. During operation, under the control of the PLC controller, the two clamping cylinders clamp the pipe to be processed, and then the lifting cylinder pushes out the pipe to be processed to complete the processing.

[0008] An optimal technical solution of the present utility model is that the oil outlet of the oil pump is also provided with a pressure sensor and a pressure maintaining valve, the oil inlet of the pressure maintaining valve is connected to the oil outlet of the oil pump, the oil outlet of the pressure maintaining valve is connected to the oil tank, and the pressure sensor and the pressure maintaining valve are connected to the PLC controller.

[0009] An optimal technical solution of the present invention is that it further includes a heat dissipation mechanism, which includes a heat dissipation motor and a heat dissipation fan. The heat dissipation motor drives the heat dissipation fan to rotate to dissipate the heat of the hydraulic oil flowing back into the oil tank.

[0010] The beneficial effects of the utility model are:

[0011] Based on our understanding of working conditions, our company adopts servo motor + oil pump supply system + touch screen PLC system control to achieve on-demand distribution of oil pressure and oil flow in each movement direction of each group of actuators (cylinders), and can arbitrarily match different workpiece pressure and position requirements through the touch screen (the cylinder has a built-in position sensor that can accurately feedback the working position, working distance and other information), which also makes the equipment better meet domestic needs;

[0012] This case is optimized from the principle, which directly reduces the use of components (3 pressure reducing valves and 2 speed regulating valves are reduced). The servo motor itself has high parameter adjustment performance and no standby operation loss, and can output on demand, which also greatly reduces the energy consumption of the equipment. A rough calculation shows that 20-30% of energy can be saved. The equipment operation noise is also greatly reduced. The reduced heat generation also allows customers to operate continuously for 4-6 hours (it is understood that similar foreign equipment is mostly from Europe. Since the climate in high latitudes is lower than the average temperature in my country, the design concept is mostly compact. Without considering the high-intensity working conditions in China, it will basically trigger a high temperature alarm after 2-3 hours of continuous operation, and the machine needs to be shut down and wait for heat dissipation before continuing to operate). BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the principle of a press hydraulic system provided in a specific embodiment of the utility model;

[0014] In the picture:

[0015] 1. Working module; 2. Hydraulic drive module; 21. Oil tank; 22. Oil pump; 23. Servo motor; 24. Holding valve; 25. Lifting valve; 11. Holding cylinder; 12. Lifting cylinder; 26. Pressure sensor; 27. Pressure maintaining valve; 4. Heat dissipation mechanism; 41. Heat dissipation motor; 42. Cooling fan. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0017] As shown in the figure, a press hydraulic system includes a working module 1 and a hydraulic drive module 2. The hydraulic drive module 2 includes an oil tank 21, an oil pump 22, a servo motor 23, a holding valve 24 and a lifting valve 25, wherein the holding valve 24 and the lifting valve 25 are three-position four-way solenoid valves; the oil inlet of the oil pump 22 is connected to the oil tank 21, and the oil outlet of the oil pump 22 is connected to the oil inlet of the holding valve 24 and the lifting valve 25. The servo motor 23 drives the oil pump 22 to pump the hydraulic oil to the holding valve 24 and the lifting valve 25. The working oil ports of the holding valve 24 and the lifting valve 25 are connected to the working module 1, and the return oil ports of the holding valve 24 and the lifting valve 25 are connected to the oil tank 21. The servo motor 23, the holding valve 24 and the lifting valve 25 are connected to the PLC controller. This case can be optimized in principle based on actual working conditions. A servo motor 23 is used instead of an ordinary motor, and a PLC controller is used to accurately control the entire hydraulic system according to needs. The servo motor 23 itself has high adjustment performance and no standby operation loss. It can output on demand, which also greatly reduces the energy consumption of the equipment. A rough calculation shows that it can save 20-30% of energy. The equipment operation noise is also greatly reduced. The reduced heat generation also allows customers to operate continuously for 4-6 hours. This greatly reduces the number of components used in the entire hydraulic system (mainly reducing the use of pressure reducing valves and speed regulating valves in the hydraulic oil circuit). This makes the hydraulic system greatly simplified while being energy-efficient and efficient, and realizes the on-demand distribution of oil pressure and oil flow in each direction of movement. At the same time, the PLC controller can be equipped with a touch screen as needed to facilitate display and control, and then fine-tuning compensation can be accurately performed according to the differences between the mold and the workpiece to be processed.

[0018] Preferably, in order to realize the clamping and jacking forming operations of the workpiece to be processed, the working module 1 includes a clamping cylinder 11 and a jacking cylinder 12. Two clamping cylinders 11 are provided, and the two clamping cylinders 11 are symmetrical about the jacking direction of the jacking cylinder 12. During operation, under the control of the PLC controller, the two clamping cylinders 11 clamp the pipe to be processed, and then the jacking cylinder 12 pushes out to complete the processing of the pipe.

[0019] At the same time, in order to ensure the safety of the entire hydraulic oil circuit during operation, the oil outlet of the oil pump 22 is also provided with a pressure sensor 26 and a pressure maintaining valve 27. The oil inlet of the pressure maintaining valve 27 is connected to the oil outlet of the oil pump 22, and the oil outlet of the pressure maintaining valve 27 is connected to the oil tank 21. The pressure sensor 26 and the pressure maintaining valve 27 are connected to the PLC controller; the hydraulic oil pressure at the oil outlet of the oil pump 22 is 0~20MPa; further, it also includes a heat dissipation mechanism 4, the heat dissipation mechanism 4 includes a heat dissipation motor 41 and a heat dissipation fan 42, the heat dissipation motor 41 drives the heat dissipation fan 42 to rotate to dissipate the heat of the hydraulic oil flowing back into the oil tank 21.

[0020] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application are also within the scope of protection of the present invention.

Claims

1. A press hydraulic system, characterized in that: The invention comprises a working module (1) and a hydraulic driving module (2), wherein the hydraulic driving module (2) comprises an oil tank (21), an oil pump (22), a servo motor (23), a clamping valve (24) and a lifting valve (25), an oil inlet of the oil pump (22) is connected to the oil tank (21), an oil outlet of the oil pump (22) is connected to the oil inlets of the clamping valve (24) and the lifting valve (25), the servo motor (23) drives the oil pump (22) to pump hydraulic oil to the clamping valve (24) and the lifting valve (25), the working oil ports of the clamping valve (24) and the lifting valve (25) are connected to the working module (1), the return oil ports of the clamping valve (24) and the lifting valve (25) are connected to the oil tank (21), and the servo motor (23), the clamping valve (24) and the lifting valve (25) are connected to a PLC controller.

2. A press hydraulic system according to claim 1, characterized in that: The holding valve (24) and the lifting valve (25) are three-position four-way solenoid valves.

3. A press hydraulic system according to claim 2, characterized in that: The working module (1) includes a clamping cylinder (11) and a lifting cylinder (12). Two clamping cylinders (11) are provided. The two clamping cylinders (11) are symmetrical with respect to the lifting direction of the lifting cylinder (12). During operation, under the control of the PLC controller, after the two clamping cylinders (11) clamp the pipe to be processed, the lifting cylinder (12) pushes out the pipe to be processed to complete the processing.

4. A press hydraulic system according to claim 1, characterized in that: The oil outlet of the oil pump (22) is further provided with a pressure sensor (26) and a pressure-maintaining valve (27); the oil inlet of the pressure-maintaining valve (27) is connected to the oil outlet of the oil pump (22); the oil outlet of the pressure-maintaining valve (27) is connected to the oil tank (21); and the pressure sensor (26) and the pressure-maintaining valve (27) are connected to the PLC controller.

5. A press hydraulic system according to claim 4, characterized in that: The hydraulic oil pressure at the oil outlet of the oil pump (22) is 0-20 MPa.

6. A press hydraulic system according to claim 1, characterized in that It also includes a heat dissipation mechanism (4), which includes a heat dissipation motor (41) and a heat dissipation fan (42). The heat dissipation motor (41) drives the heat dissipation fan (42) to rotate to dissipate the heat of the hydraulic oil flowing back into the oil tank (21).

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