Hydraulic system of magnetic sheet hydraulic machine

Abstract

The utility model discloses a magnetic sheet hydraulic machine hydraulic system which comprises an oil tank, an installation valve block, an upper die plate of a hydraulic machine, a lower die plate of the hydraulic machine and an oil tank servo pump, the servo pump comprises a working pump and a steering pump, a servo controller controls a servo motor to drive the servo pump to work, and the servo pump is connected with the upper die plate and the lower die plate through the installation valve block. The mounting valve block comprises an electromagnetic relief valve, an electromagnetic reversing valve, a high-pressure filter, an electro-hydraulic reversing valve and an electromagnetic reversing valve, a hydraulic control one-way valve and a balance valve are arranged between the mounting valve block and the upper template and between the mounting valve block and the lower template, and a pressure sensor is arranged between the mounting valve block and the servo controller. The hydraulic system is reasonable and ingenious in structural design, the overall energy consumption of the hydraulic system can be reduced, the production process is immobilized, and the product quality can be improved.

Description

Technical Field

[0001] The utility model relates to a hydraulic system, in particular to a hydraulic system of a magnetic sheet hydraulic press. Background Art

[0002] At present, most of the hydraulic systems used in magnetic sheet hydraulic presses for high-performance sintered neodymium iron boron permanent magnet materials are combinations of three-phase asynchronous motor pump sets and conventional switching valves for the control of the hydraulic system. However, the conventional switching valves used in the existing hydraulic systems have high energy consumption and are not easy to control, and cannot achieve precise control of the hydraulic press and solidify the production process, reducing the production efficiency of neodymium iron boron permanent magnet sheets, and there are also large differences in the quality of products, which is not conducive to improving product quality. Content of the Utility Model

[0003] In order to overcome the above deficiencies, the utility model provides a hydraulic system of a magnetic sheet hydraulic press, which can reduce energy consumption, solidify the production process, and improve product quality.

[0004] To achieve this purpose, the structure adopted by the utility model is as follows: the hydraulic system of the magnetic sheet hydraulic press includes an oil tank, a mounting valve block, an upper template and a lower template of the hydraulic press. A servo pump is arranged in the oil tank. The servo pump includes a working pump and a steering pump, and the servo motor is controlled by a servo controller to drive the servo pump to operate. The servo pump is connected to the upper template and the lower template through the mounting valve block. The mounting valve block includes a main electromagnetic directional valve, and the main electromagnetic directional valve is connected to a valve group for controlling the upper template and a valve group for controlling the lower template through an oil delivery pipe. The valve group for controlling the upper template includes a first electro-hydraulic directional valve and a first electromagnetic directional valve, and the valve group for controlling the lower template includes a second electro-hydraulic directional valve and a second electromagnetic directional valve. The first electro-hydraulic directional valve is connected to the upper template through a first hydraulic control check valve, and the first electromagnetic directional valve is connected to the upper template through a first balance valve. The second electro-hydraulic directional valve is connected to the lower template through a second hydraulic control check valve, and the second electromagnetic directional valve is connected to the lower template through a second balance valve.

[0005] An electromagnetic relief valve is arranged on the oil delivery pipe connecting the main electromagnetic directional valve to the first electro-hydraulic directional valve and the second electro-hydraulic directional valve; an overflow valve is arranged on the oil delivery pipe connecting the main electromagnetic directional valve to the first electromagnetic directional valve and the second electromagnetic directional valve.

[0006] A stacked pressure reducing valve is arranged between the first electro-hydraulic directional valve and the first hydraulic control check valve; a stacked pressure reducing valve is arranged between the first electromagnetic directional valve and the first balance valve; a stacked pressure reducing valve is arranged between the second electro-hydraulic directional valve and the second hydraulic control check valve; a stacked pressure reducing valve is arranged between the second electromagnetic directional valve and the second balance valve;

[0007] A first high-pressure filter and a first pressure measuring device are provided on the oil pipelines connecting the main electromagnetic reversing valve to the first and second electro-hydraulic reversing valves. A second high-pressure filter and a second pressure measuring device are provided on the oil pipelines connecting the main electromagnetic reversing valve to the first and second electromagnetic reversing valves.

[0008] A first pressure sensor is provided between the first and second electro-hydraulic reversing valves and the servo controller; a second pressure sensor is provided between the first and second electromagnetic reversing valves and the servo controller.

[0009] A water-electricity safety valve is provided between the mounting valve block and the oil tank; a water cooler and an oil return filter are provided between the mounting valve block and the oil return port of the oil tank.

[0010] An air filter, a liquid level and liquid temperature gauge, a liquid level transmitter and a temperature switch are provided in the oil tank.

[0011] The connecting pipe of the oil inlet of the upper template is connected with a first electromagnetic ball valve, and the connecting pipe of the oil outlet of the upper template is connected with a second electromagnetic ball valve.

[0012] The beneficial effects are as follows: The structure of the present utility model is designed reasonably and ingeniously. By collecting data through sensor elements such as pressure, displacement, flow rate, and temperature to establish a digital model and pre-programming in the PLC, the precise control of pressure and flow rate can be achieved by controlling the output speed and output torque of the servo motor, meeting the requirements of precise control of product quality, making the production process fixed, reducing production energy consumption, and enabling rapid switching between different product production processes, thereby improving work efficiency. Description of the Drawings

[0013] The present utility model will be described by way of examples with reference to the accompanying drawings, where:

[0014] Figure 1 is the structural schematic diagram of the present utility model;

[0015] Figure 2 is the structural schematic diagram of the said mounting valve block. Detailed Description of the Specific Embodiment

[0016] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0017] In the description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0018] In the description of the utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "equipped with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements; the fixed connection can be welding or bonding. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0019] As Figure 1 , Figure 2 shown in the magnetic sheet hydraulic press hydraulic system, it includes an oil tank 5, an installation valve block 26, the upper template M1 and the lower template M2 of the hydraulic press. The oil tank 5 is provided with a servo pump 9. The servo pump 9 includes a working pump and a steering pump, and is driven by a servo motor 7 controlled by a servo controller 6 to operate the servo pump 9. The servo pump 9 is connected to the upper template M1 and the lower template M2 through the installation valve block 26; the installation valve block includes a main electromagnetic reversing valve 14. The main electromagnetic reversing valve 14 is connected to the valve group controlling the upper template M1 and the valve group controlling the lower template M2 through an oil pipeline. The valve group controlling the upper template M1 includes a first electro-hydraulic reversing valve 19.1 and a first electromagnetic reversing valve 20.1. The valve group controlling the lower template M2 includes a second electro-hydraulic reversing valve 19.2 and a second electromagnetic reversing valve 20.2; the first electro-hydraulic reversing valve 19.1 is connected to the upper template M1 through a first hydraulic control check valve 21.1, and the first electromagnetic reversing valve 20.1 is connected to the upper template M1 through a first balance valve 22.1; the second electro-hydraulic reversing valve 19.2 is connected to the lower template M2 through a second hydraulic control check valve 21.2, and the second electromagnetic reversing valve 20.2 is connected to the lower template M2 through a second balance valve 22.2.

[0020] An electromagnetic overflow valve 13 is provided on the oil pipeline connecting the main electromagnetic reversing valve 14 to the first electro-hydraulic reversing valve 19.1 and the second electro-hydraulic reversing valve 19.2; an overflow valve 15 is provided on the oil pipeline connecting the main electromagnetic reversing valve 14 to the first electromagnetic reversing valve 20.1 and the second electromagnetic reversing valve 20.2.

[0021] A stacking pressure reducing valve is provided between the first electro-hydraulic directional valve 19.1 and the first pilot-operated check valve 21.1; a stacking pressure reducing valve is provided between the first electromagnetic directional valve 20.1 and the first balance valve 22.1; a stacking pressure reducing valve is provided between the second electro-hydraulic directional valve 19.2 and the second pilot-operated check valve 21.2; a stacking pressure reducing valve is provided between the second electromagnetic directional valve 20.2 and the second balance valve 22.2;

[0022] On the oil pipelines connecting the main electromagnetic directional valve 14 to the first electro-hydraulic directional valve 19.1 and the second electro-hydraulic directional valve 19.2, a first high-pressure filter 16.1 and a first pressure measuring device 27.1 are provided; on the oil pipelines connecting the main electromagnetic directional valve 14 to the first electromagnetic directional valve 20.1 and the second electromagnetic directional valve 20.2, a second high-pressure filter 16.2 and a second pressure measuring device 27.2 are provided.

[0023] A first pressure sensor 18.1 is provided between the first electro-hydraulic directional valve 19.1 and the second electro-hydraulic directional valve 19.2 and the servo controller 6; a second pressure sensor 18.2 is provided between the first electromagnetic directional valve 20.1 and the second electromagnetic directional valve 20.2 and the servo controller 6.

[0024] A water-electric safety valve 12 is provided between the mounting valve block 26 and the oil tank 5; a water cooler 11 and an oil return filter 10 are provided between the mounting valve block 26 and the oil return port of the oil tank 5.

[0025] An air filter 1, a liquid level and liquid temperature gauge 2, a liquid level transmitter 3 and a temperature switch 4 are provided in the oil tank 5.

[0026] The connecting pipe of the oil inlet of the upper template M1 is connected with a first electromagnetic ball valve 25.1, and the connecting pipe of the oil outlet of the upper template M1 is connected with a second electromagnetic ball valve 25.2.

[0027] The pressure sensor can detect the actual pressure of the system pressure pipeline, output the signal to the servo controller to control the output speed and output torque of the servo motor, the electromagnetic directional valve controls the movement direction of the oil cylinders connected to the upper template and the lower template, and the electromagnetic relief valve regulates the actual pressure of the mounting valve block.

[0028] Embodiment 1

[0029] I. Action sequence:

[0030] Mold closing action: The lower module rises rapidly (to position a) → the lower module rises (accurately positioned to position b) → the upper module descends rapidly (to position A) → the upper module descends (accurately positioned to position B) → mold closing (to position C);

[0031] Mold opening action: The lower module pushes the upper module to rise (to position c) → the upper module rises to the starting point → the lower module descends to the starting point.

[0032] II. Action Execution (Mold Closing):

[0033] 1. The lower mold quickly rises (to position a): The servo motor operates (n = 1800 - 2000 r / min), YV01 / YV02 / YD11 are energized, the large and small pumps combine to supply oil, and the lower mold cylinder advances quickly (v = 124.74 - 138.60 mm / s). When it reaches position a, YV01 / YV02 / YD11 are de-energized;

[0034] 2. The lower mold rises (accurately positioned to position b): The servo motor operates (n = 400 - 800 r / min), YV02 / YD13 are energized, the small pump works alone, and the lower mold cylinder executes slow advance (v = 7.87 - 15.75 mm / s). When it reaches position b and is accurately positioned (≤0.1 mm), after the pressure reaches 220 bar and is locked, YV02 / YD13 are de-energized;

[0035] 3. The upper mold quickly descends (to position A): The servo motor operates (n = 1800 - 2000 r / min), YV01 / YV02 / YD01 are energized, the upper mold cylinder advances quickly (v = 124.74 - 138.60 mm / s). When it reaches position A, YV01 / YV02 / YD01 are de-energized;

[0036] 4. The upper mold descends (accurately positioned to position B): The servo motor operates (n = 400 - 800 r / min), YV02 / YD03 are energized, the upper mold cylinder executes slow advance (v = 7.87 - 15.75 mm / s). When it reaches position B and is accurately positioned (≤0.1 mm), YV02 / YD03 are de-energized;

[0037] 5. Mold closing and locking (there are three modes: the lower mold as the support, the upper mold as the support, and both the upper and lower molds closing simultaneously)

[0038] 5.1 Mold closing and locking (to position C): The servo motor operates (n = 200 r / min), YV03 / YD03 are energized, the upper mold cylinder executes working feed (v = 1.57 mm / s). When it reaches position C, after the pressure reaches 200 bar and is locked, YV03 / YD03 are de-energized, and locking is executed (the locking time requirement is ≥8 s);

[0039] 5.2 Mold closing and locking (to position c): The servo motor operates (n = 200 r / min), YV03 / YD13 are energized, the lower mold cylinder executes working feed (v = 1.57 mm / s). When it reaches position C, after the pressure reaches 200 bar and is locked, YV03 / YD13 are de-energized, and locking is executed (the locking time requirement is ≥8 s);

[0040] 5.3 Mold clamping and locking (to position C / c): The servo motor operates (n = 200 r / min), YV03 / YD03 / YD13 are energized, the upper and lower module cylinders perform the forward feed (v = 0.8 mm / s), reach position C / c, and after the pressure reaches 200 bar and is locked, YV03 / YD03 / YD13 are de-energized, and the mold is locked (the required mold locking time is ≥ 8 s);

[0041] III. Action execution (mold opening):

[0042] 1. The lower module pushes the upper mold up (to position c): After YV04 is energized and delayed for 0.5 s, the servo motor operates (n = 200 r / min), YV03 / YD14 / YV05 / YV04 are energized, the lower module cylinder rises (v = 3.94 mm / s), reaches position c, and YV03 / YD14 / YV05 / YV04 are de-energized;

[0043] 2. The upper module rises to the starting point of the upper mold: The servo motor operates (n = 1800 - 2000 r / min), YV01 / YD02 / YD04 are energized, the upper module cylinder rises (v = 204.70 - 227.44 mm / s), and when it reaches the starting position of the upper module cylinder, YV01 / YD02 / YD04 are de-energized;

[0044] 3. The lower module descends to the starting point: The servo motor operates (n = 1800 - 2000 r / min), YV01 / YD12 / YD14 are energized, the lower module cylinder rises (v = 204.70 - 227.44 mm / s), and when it reaches the starting position of the lower module cylinder, YV01 / YD12 / YD14 are de-energized.

[0045] IV. The action process ends.

[0046] The structure design of the present utility model is reasonable and ingenious. By using sensor detection elements such as pressure, displacement, flow rate, and temperature to collect data and establish a digital model, and pre-programming in the PLC, it is possible to accurately control the pressure and flow rate by controlling the output speed and output torque of the servo motor, meet the requirements of accurately controlling the product quality, fix the production process, reduce production energy consumption, and also achieve a rapid switch between different product production processes, improving work efficiency.

[0047] Based on the inspiration of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. The hydraulic system of the magnetic sheet hydraulic press is characterized by: The invention comprises an oil tank (5), an installation valve block (26), and an upper template (M1) and a lower template (M2) of a hydraulic press. The oil tank (5) is provided with a servo pump (9). The servo pump (9) comprises a working pump and a steering pump. A servo controller (6) controls a servo motor (7) to drive the servo pump (9) to operate. The servo pump (9) is connected to the upper template (M1) and the lower template (M2) through the installation valve block (26). The installation valve block comprises a main electromagnetic reversing valve (14). The main electromagnetic reversing valve (14) is connected to a valve group controlling the upper template (M1) and a valve group controlling the lower template (M2) through an oil pipeline. The valve group controlling the upper template (M1) comprises a first electro-hydraulic reversing valve (14). 9.1) and a first electromagnetic reversing valve (20.1), the valve group controlling the lower template (M2) comprises a second electro-hydraulic reversing valve (19.2) and a second electromagnetic reversing valve (20.2); the first electro-hydraulic reversing valve (19.1) is connected to the upper template (M1) through a first hydraulically controlled one-way valve (21.1), and the first electromagnetic reversing valve (20.1) is connected to the upper template (M1) through a first balancing valve (22.1); the second electro-hydraulic reversing valve (19.2) is connected to the lower template (M2) through a second hydraulically controlled one-way valve (21.2), and the second electromagnetic reversing valve (20.2) is connected to the lower template (M2) through a second balancing valve (22.2).

2. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: An electromagnetic overflow valve (13) is provided on the oil delivery pipe connecting the main electromagnetic reversing valve (14) with the first electro-hydraulic reversing valve (19.1) and the second electro-hydraulic reversing valve (19.2); an overflow valve (15) is provided on the oil delivery pipe connecting the main electromagnetic reversing valve (14) with the first electromagnetic reversing valve (20.1) and the second electromagnetic reversing valve (20.2).

3. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: A stacked pressure reducing valve is provided between the first electro-hydraulic reversing valve (19.1) and the first hydraulically controlled one-way valve (21.1); A stacked pressure reducing valve is provided between the first electromagnetic reversing valve (20.1) and the first balancing valve (22.1); a stacked pressure reducing valve is provided between the second electro-hydraulic reversing valve (19.2) and the second hydraulically controlled one-way valve (21.2); and a stacked pressure reducing valve is provided between the second electromagnetic reversing valve (20.2) and the second balancing valve (22.2).

4. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: A first high-pressure filter (16.1) and a first pressure measuring device (27.1) are provided on the oil delivery pipe through which the main electromagnetic reversing valve (14) is connected to the first electro-hydraulic reversing valve (19.1) and the second electro-hydraulic reversing valve (19.2); a second high-pressure filter (16.2) and a second pressure measuring device (27.2) are provided on the oil delivery pipe through which the main electromagnetic reversing valve (14) is connected to the first electromagnetic reversing valve (20.1) and the second electromagnetic reversing valve (20.2).

5. The hydraulic system of the magnetic sheet hydraulic press according to claim 4, characterized in that: A first pressure sensor (18.1) is provided between the first electro-hydraulic reversing valve (19.1), the second electro-hydraulic reversing valve (19.2) and the servo controller (6); and a second pressure sensor (18.2) is provided between the first electromagnetic reversing valve (20.1), the second electromagnetic reversing valve (20.2) and the servo controller (6).

6. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: A water and electricity safety valve (12) is arranged between the mounting valve block (26) and the oil tank (5); a water cooler (11) and an oil return filter (10) are arranged between the mounting valve block (26) and the oil return port of the oil tank (5).

7. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: An air filter (1), a liquid level and liquid temperature gauge (2), a liquid level transmitter (3) and a temperature switch (4) are arranged in the oil tank (5).

8. The hydraulic system of the magnetic sheet hydraulic press according to claim 1, characterized in that: The oil inlet connecting pipe of the upper mold plate (M1) is connected to a first electromagnetic ball valve (25.1), and the oil outlet connecting pipe of the upper mold plate (M1) is connected to a second electromagnetic ball valve (25.2).

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