CN218717912U - Accurate pressure control system in isostatic pressing machine pressure-increasing and pressure-reducing process - Google Patents
Accurate pressure control system in isostatic pressing machine pressure-increasing and pressure-reducing process Download PDFInfo
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- CN218717912U CN218717912U CN202222919798.2U CN202222919798U CN218717912U CN 218717912 U CN218717912 U CN 218717912U CN 202222919798 U CN202222919798 U CN 202222919798U CN 218717912 U CN218717912 U CN 218717912U
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- 238000000462 isostatic pressing Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002706 hydrostatic effect Effects 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 description 49
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000003068 static effect Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses an accurate pressure control system in the process of boosting and reducing pressure of an isostatic pressing machine, which comprises a hydraulic working chamber 12 of the isostatic pressing machine, a supercharger 8, an oil tank 1, a hydraulic pump 2, a servo motor 3, a three-position four-way directional control valve 9 and a proportional pressure valve 10; an output port b of the pressurized oil of the supercharger 8 is connected with an oil delivery port of the hydraulic working cavity 12 of the hydrostatic press, and the output port b of the pressurized oil of the supercharger 8 is connected with the high-pressure sensor 6; a low-pressure oil input port a of the supercharger 8 is connected in parallel with a port A of the three-position four-way direction control valve 9 and an oil inlet e of the proportional pressure valve 10; a low-pressure oil inlet a of the supercharger 8 is connected with a low-pressure sensor 7; the oil outlet of the proportional pressure valve 10 is connected with the oil tank 1; the unloading port c of the supercharger 8 is connected with the port B of the three-position four-way directional control valve 9. The utility model discloses be applied to the isostatic pressing equipment that uses hydraulic cylinder pressure boost, including cold isostatic press, temperature isostatic press and dry pocket type isostatic press etc. have fine market using value.
Description
Technical Field
The utility model belongs to the technical field of hydraulic control, a hydraulic pressure accurate control of isostatic pressing machine is related to, specifically is an isostatic pressing machine steps up and step down in-process accurate pressure control system.
Background
At present, for pressure control of the system pressure of the existing isostatic pressing machine, open-loop control is mainly adopted, namely the system is not controlled in the pressure increasing and reducing processes, only after the system reaches the target pressure, the switch valve is involved, and the pressure source is closed to control the hydraulic system. And because the mode that the asynchronous three-phase motor drives the constant delivery pump is adopted, the control on the flow and the time of the A cavity flowing into the supercharger can not be realized, so that the pressure and the time of the isostatic pressing machine system are only determined by the rated rotating speed of the asynchronous three-phase motor and the discharge capacity of the constant delivery pump, and the change can not be realized. The biggest defects of the control method are that the pressure precision cannot be accurately controlled, the overpressure phenomenon is serious, the pressure rising time and the pressure reducing time cannot be controlled, and the pressure and the time of equipment cannot be accurately controlled.
As the precision and time requirements for the control of the pressure increasing and reducing processes of the isostatic pressing machine in the using process of the equipment are more and more accurate, the current control mode of adopting the hydraulic oil cylinder for pressurizing cannot meet the requirements of customers.
Disclosure of Invention
The utility model aims at providing an isostatic pressing machine steps up and step down in-process accurate pressure control system ensures that the isostatic pressing machine steps up and step down in-process accurate pressure control, guarantees the pressure value and steps up the step down speed controllable.
The utility model discloses an adopt following technical scheme to realize:
an accurate pressure control system in the pressure increasing and reducing process of an isostatic pressing machine comprises a hydraulic working cavity of the isostatic pressing machine, a supercharger, an oil tank, a hydraulic pump, a servo motor, a three-position four-way directional control valve and a proportional pressure valve; the output port b of the pressurized oil of the supercharger is connected with an oil delivery port of a hydraulic working cavity of the static pressure machine, and the output port b of the pressurized oil of the supercharger is connected with a high-pressure sensor; a low-pressure oil input port a of the supercharger is connected in parallel with a port A of the three-position four-way directional control valve and an oil inlet e of the proportional pressure valve; a low-pressure oil inlet a of the supercharger is connected with a low-pressure sensor; the oil outlet of the proportional pressure valve is connected with an oil tank; the unloading port c of the supercharger is connected with the port B of the three-position four-way directional control valve; the port P of the three-position four-way directional control valve is connected with an oil outlet of the hydraulic pump, and the port T of the three-position four-way directional control valve is connected with an oil tank; an oil inlet of the hydraulic pump is connected with an oil tank; the hydraulic pump is controlled by a servo motor to act, the servo motor is controlled by a servo motor controller to act, and the servo motor controller is electrically connected with the PLC; the high-voltage sensor and the low-voltage sensor are respectively electrically connected with the PLC; the proportional pressure valve is controlled by a PLC.
When the hydraulic pump works, the quantitative hydraulic pump ensures that the displacement of each circle of rotation of the oil pump is the same, and the hydraulic pump is ensured to discharge hydraulic oil with specified quantity and specified pressure through the control of the rotating speed and the torque of the servo motor.
And a boosting control process: the left electromagnet of the three-position four-way directional control valve is attracted and positioned at the left position, hydraulic oil can flow into a cavity A (low-pressure cavity) in the supercharger 8 through the left electromagnet of the three-position four-way directional control valve, and pressurized medium in a cavity B (high-pressure cavity) in the supercharger is pressed into a hydraulic working cavity of the static pressure machine according to the proportion of the supercharging ratio of the supercharger after being pressurized by a cavity C (supercharging cavity) of the supercharger. Due to the inflow of high-pressure liquid, the pressure in the hydraulic working chamber of the hydrostatic machine is increased. The pressure is detected by the high-pressure sensor and fed back to the PLC, and after the pressure is calculated by the PLC, the rotating speed and the torque of the servo motor are controlled by the servo motor controller, so that the pressurizing speed and the pressurizing value in the hydraulic working cavity of the hydrostatic machine meet the requirements.
And (3) a step-down control process: close the three-position four-way directional control valve (in the neutral position) according to: working chamber pressure = booster B chamber pressure, booster a chamber pressure = booster B chamber pressure/booster boost ratio. The pressure of the cavity A in the supercharger is controlled by the proportional pressure valve, the pressure of the cavity A in the supercharger is controlled by the PLC after the high-pressure sensor detects the pressure value of the hydraulic working cavity of the hydrostatic machine, the pressure of the cavity A in the supercharger is controlled by the PLC in a feedback mode, and the pressure value of the cavity A in the supercharger is detected by the low-pressure sensor and fed back to the PLC to correct the pressure value of the proportional pressure valve. Therefore, the pressure precision and the descending speed in the hydraulic working cavity of the hydrostatic machine are ensured to meet the requirements.
When the supercharger is not reset, the three-position four-way directional control valve is positioned at the right position, hydraulic oil enters from the unloading port c of the supercharger under the action of the hydraulic pump through the right position function of the directional control valve, flows out from the low-pressure oil inlet a of the supercharger and flows back to the oil tank through the T port of the three-position four-way directional control valve, and the supercharger can be forcibly reset.
Preferably, a pressure-limiting overflow valve is arranged between the oil outlet of the hydraulic pump and the oil tank; after the system pressure exceeds the limit, the high-pressure oil output by the hydraulic pump directly flows back to the oil tank through the pressure-limiting overflow valve, so that the safety is ensured.
The utility model relates to a rationally, be applied to the isostatic pressing equipment that uses hydraulic cylinder pressure boost, including cold isostatic press, warm isostatic press and dry pocket type isostatic press etc. have fine market and practical application and worth.
Drawings
Fig. 1 shows a schematic structural diagram of the present invention.
In the figure: 1-oil tank, 2-hydraulic pump, 3-servo motor, 4-servo motor controller, 5-PLC, 6-high pressure sensor, 7-low pressure sensor, 8-supercharger, 9-three-position four-way direction control valve, 10-proportional pressure valve, 11-pressure limiting overflow valve and 12-static pressure machine hydraulic working chamber.
Detailed Description
The following describes in detail specific embodiments of the present invention with reference to the accompanying drawings.
An accurate pressure control system in the pressure increasing and reducing process of an isostatic pressing machine is shown in figure 1 and comprises a hydraulic working cavity 12 of the isostatic pressing machine, a supercharger 8, an oil tank 1, a hydraulic pump 2, a servo motor 3, a three-position four-way directional control valve 9, a proportional pressure valve 10, a high-pressure sensor 6, a low-pressure sensor 7 and the like.
As shown in fig. 1, the output port b of the pressurized oil of the supercharger 8 is connected to the oil supply port of the hydrostatic machine hydraulic working chamber 12 through an oil passage. According to the condition that the pressure in the hydraulic working cavity of the static pressure machine is equal to the pressure in a high-pressure cavity (cavity B) of the supercharger, a supercharged oil output port B of the supercharger 8 is connected with a high-pressure sensor 6 and used for monitoring the pressure in the hydraulic working cavity 12 of the static pressure machine during supercharging.
As shown in fig. 1, the low-pressure oil input port a of the supercharger 8 is connected in parallel to the port a of the three-position four-way directional control valve 9 and the oil inlet e of the proportional pressure valve 10, respectively, through oil passages. According to the condition that the pressure of a low-pressure cavity (cavity A) in the pressure booster is equal to the pressure ratio of cavity B in the pressure booster to the pressure booster, a low-pressure oil input port a of the pressure booster 8 is connected with a low-pressure sensor 7 and used for monitoring the pressure when the pressure in a hydraulic working cavity 12 of the static pressure machine is relieved. The oil outlet of the proportional pressure valve 10 is connected with the oil tank 1, and the pressure of the cavity A in the supercharger is controlled by the proportional pressure valve.
As shown in fig. 1, the relief port c of the supercharger 8 is connected to the port B of the three-position four-way directional control valve 9 through an oil passage.
As shown in fig. 1, the port P of the three-position four-way directional control valve 9 is connected to the oil outlet of the hydraulic pump 2 through an oil passage, and the oil inlet of the hydraulic pump 2 is connected to the oil tank 1 through an oil passage. The T port of the three-position four-way directional control valve 9 is connected with the oil tank 1 through an oil way. When the three-position four-way directional control valve 9 is positioned at the left position, a port P and a port A of the three-position four-way directional control valve 9 are communicated with a low-pressure oil input port a of the supercharger 8, and a port T and a port B of the three-position four-way directional control valve 9 are communicated with an unloading port C of a supercharging cavity C in the supercharger 8; when the three-position four-way directional control valve 9 is positioned at the middle position, the port P and the port A of the three-position four-way directional control valve 9 are disconnected, and the port T and the port B of the three-position four-way directional control valve 9 are communicated with the unloading port C of the pressurizing cavity C in the pressurizer 8; when the three-position four-way directional control valve 9 is positioned at the right position, the port P and the port B of the three-position four-way directional control valve 9 are communicated with the unloading port C of the pressurizing cavity C in the pressurizer 8, and the port T and the port a of the three-position four-way directional control valve 9 are communicated with the low-pressure oil input port a of the low-pressure cavity a in the pressurizer 8.
As shown in fig. 1, a pressure-limiting overflow valve 11 is arranged between an oil outlet of the hydraulic pump 2 and the oil tank 1 to prevent the pressure of the whole system from being too high, and high-pressure oil output by the hydraulic pump 2 directly flows back to the oil tank 1 through the pressure-limiting overflow valve 11.
As shown in fig. 1, the hydraulic pump 2 is controlled by a servo motor 3, the servo motor 3 is controlled by a servo motor controller 4, and the servo motor controller 4 is electrically connected with a PLC 5; the high-voltage sensor 6 and the low-voltage sensor 7 are respectively electrically connected with the PLC 5. The proportional pressure valve 10 is controlled by the PLC 5.
When the hydraulic pump works, the quantitative hydraulic pump 2 ensures that the displacement of each circle of rotation of the oil pump is the same, and the hydraulic pump 2 is ensured to discharge hydraulic oil with specified quantity and specified pressure through the control of the rotating speed and the torque of the servo motor 3.
And (3) a boosting control process: the left electromagnet of the three-position four-way directional control valve 9 is attracted and positioned at the left position, hydraulic oil can flow into a cavity A (low-pressure cavity) in the supercharger 8 through the left position of the three-position four-way directional control valve 9, and after the hydraulic oil is supercharged according to a specified supercharging ratio through a cavity C (supercharging cavity) in the supercharger 8, a pressurizing medium in a cavity B (high-pressure cavity) in the supercharger 8 is pressed into a hydraulic working cavity 12 of the static pressure machine according to the supercharging ratio of the supercharger. Due to the inflow of high pressure fluid, the pressure in the hydrostatic machine hydraulic working chamber 12 increases. The pressure is detected by the high-pressure sensor 6 and fed back to the PLC 5, and after the calculation by the PLC 5, the rotating speed and the torque of the servo motor 3 are controlled by the servo motor controller 4, so that the pressurizing speed and the pressurizing value in the hydraulic working cavity 12 of the hydrostatic machine meet the requirements.
And (3) a step-down control process: the three-position four-way directional control valve 9 (in the neutral position) is closed according to: working chamber pressure = booster B chamber pressure, booster a chamber pressure = booster B chamber pressure/booster boost ratio. The pressure of the cavity A in the supercharger 8 is controlled by the proportional pressure valve 10, the pressure of the cavity A in the supercharger 8 is controlled by the PLC 5 after the pressure sensor 6 detects the pressure value of the hydraulic working cavity 12 of the hydrostatic machine, the PLC 5 feeds back the pressure to the PLC 5, the pressure of the cavity A in the supercharger 8 is controlled by the PLC 5, and the pressure value of the cavity A in the supercharger 8 is detected by the low-pressure sensor 7 and fed back to the PLC 5 to correct the pressure value of the proportional pressure valve 10. Thereby ensuring that the pressure precision and the descending speed in the hydraulic working chamber 12 of the hydrostatic machine meet the requirements.
In the process of voltage boosting and voltage reducing, the control calculation of the PLC belongs to the conventional technical means, and the programming technicians in a factory can easily realize the control calculation through the existing control software without technical difficulty.
When the booster is not reset, the three-position four-way directional control valve 9 is positioned at the right position, hydraulic oil enters from the unloading port c of the booster 8 under the action of the hydraulic pump 2 through the function of the right position of the directional control valve, flows out from the low-pressure oil inlet a of the booster and flows back to the oil tank 1 through the T port of the three-position four-way directional control valve 9, and the booster 8 can be reset forcibly.
During specific implementation, a client can set the working pressure of the isostatic pressing machine, the number of the boosting sections, the time length and the duration of each boosting section, the number of the pressure relief sections and the time length and the duration of each pressure relief section according to own requirements. According to the parameters set by the customer, the PLC in the isostatic pressing machine system is used for calculating, and the rotating speed and the torque of the servo motor are accurately controlled through the servo motor controller, so that the boosting process of the system is ensured to be in accordance with the setting of the customer. According to the parameters set by the customer, after the parameters are calculated by the isostatic press PLC, corresponding control signals are given to the proportional pressure valve, the proportional pressure valve accurately controls the pressure in the cavity A of the supercharger, and the pressure value in the high-pressure cavity is changed according to the set parameters through the accurate control of the size and time of the control signals.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which shall be covered by the claims of the present invention.
Claims (2)
1. An accurate pressure control system in the pressure increasing and reducing process of an isostatic pressing machine comprises a hydraulic working cavity (12) of the isostatic pressing machine, a pressure booster (8), an oil tank (1), a hydraulic pump (2), a servo motor (3), a three-position four-way directional control valve (9) and a proportional pressure valve (10);
the method is characterized in that: an output port b of pressurized oil of the supercharger (8) is connected with an oil delivery port of a hydraulic working cavity (12) of the hydrostatic press, and the output port b of the pressurized oil of the supercharger (8) is connected with the high-pressure sensor (6);
a low-pressure oil inlet a of the supercharger (8) is connected in parallel with an A port of the three-position four-way directional control valve (9) and an oil inlet e of the proportional pressure valve (10); a low-pressure oil inlet a of the supercharger (8) is connected with a low-pressure sensor (7); an oil outlet of the proportional pressure valve (10) is connected with an oil tank (1);
an unloading port c of the supercharger (8) is connected with a port B of the three-position four-way directional control valve (9);
a port P of the three-position four-way directional control valve (9) is connected with an oil outlet of the hydraulic pump (2), and a port T of the three-position four-way directional control valve (9) is connected with the oil tank (1); an oil inlet of the hydraulic pump (2) is connected with the oil tank (1);
the hydraulic pump (2) is controlled by a servo motor (3) to act, the servo motor (3) is controlled by a servo motor controller (4) to act, and the servo motor controller (4) is electrically connected with a PLC (5); the high-voltage sensor (6) and the low-voltage sensor (7) are respectively electrically connected with the PLC (5); the proportional pressure valve (10) is controlled by a PLC (5).
2. The system for precisely controlling the pressure during the pressure increasing and reducing process of the isostatic pressing machine according to claim 1, wherein: and a pressure limiting overflow valve (11) is arranged between the oil outlet of the hydraulic pump (2) and the oil tank (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222919798.2U CN218717912U (en) | 2022-11-03 | 2022-11-03 | Accurate pressure control system in isostatic pressing machine pressure-increasing and pressure-reducing process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222919798.2U CN218717912U (en) | 2022-11-03 | 2022-11-03 | Accurate pressure control system in isostatic pressing machine pressure-increasing and pressure-reducing process |
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| CN218717912U true CN218717912U (en) | 2023-03-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117605718A (en) * | 2023-11-21 | 2024-02-27 | 佛山市康思达液压机械有限公司 | Variable boost ratio hydraulic boost system and control method |
| CN118219600A (en) * | 2024-05-22 | 2024-06-21 | 湖南隆深氢能科技有限公司 | Flexible dynamic sealing system for continuous hot press |
-
2022
- 2022-11-03 CN CN202222919798.2U patent/CN218717912U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117605718A (en) * | 2023-11-21 | 2024-02-27 | 佛山市康思达液压机械有限公司 | Variable boost ratio hydraulic boost system and control method |
| CN118219600A (en) * | 2024-05-22 | 2024-06-21 | 湖南隆深氢能科技有限公司 | Flexible dynamic sealing system for continuous hot press |
| CN118219600B (en) * | 2024-05-22 | 2024-08-16 | 湖南隆深氢能科技有限公司 | Flexible dynamic sealing system for continuous hot press |
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Address after: 030013 Xiangyang Town Xiangyang Village, Jiancaoping District, Taiyuan City, Shanxi Province Patentee after: Shanxi Hongyi Machinery Equipment Co.,Ltd. Address before: 030003 Xiangyang Village, Xiangyang Town, Jiancaoping District, Taiyuan City, Shanxi Province (in the yard of Jinshan electroplating factory) Patentee before: TAIYUAN HONGHUO MACHINERY EQUIPMENT Co.,Ltd. |
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