CN210100622U - Frequency conversion speed regulation hydraulic control system of plastic forming machine - Google Patents
Frequency conversion speed regulation hydraulic control system of plastic forming machine Download PDFInfo
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- CN210100622U CN210100622U CN201921011346.6U CN201921011346U CN210100622U CN 210100622 U CN210100622 U CN 210100622U CN 201921011346 U CN201921011346 U CN 201921011346U CN 210100622 U CN210100622 U CN 210100622U
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Abstract
The utility model discloses a plastic forming machine Variable Frequency Speed Governing (VFSG) hydraulic control system, including the PLC controller, the PLC controller connects servo driver, and servo driver connects the converter, and servo motor connects converter, position tacho sensor, servo driver and constant delivery pump, and constant delivery pump is connected action and is carried out hydro-cylinder and proportion direction flow valve, sets up flowmeter, first pressure sensor and second pressure sensor on the defeated oil pipe between constant delivery pump and the proportion direction flow valve. The utility model has the advantages of reasonable design, flowmeter, first pressure sensor and second pressure sensor feed back the actual operating signal of constant delivery pump to servo driver, and position/speed sensor feeds back servo driver with servo motor's operation situation, and servo driver adjusts in real time and handles servo motor's output according to the operating signal of feedback, has guaranteed the stable output of constant delivery pump, has reduced the waste of the energy, has improved the economic benefits of enterprise.
Description
Technical Field
The utility model belongs to the plastic manufacturing field especially relates to a plastic molding machine Variable Frequency Speed Governing (VFSG) hydraulic control system.
Background
Injection molding refers to a plastic processing method in which a heated and plasticized resin material is injected into a mold of a molding die under a certain pressure, and is cooled, solidified and molded to obtain a plastic product. Most of the existing injection molding equipment adopts a hydraulic injection molding machine, and for the hydraulic injection molding machine, different technological processes require a hydraulic system to provide different working flows and pressures to be reflected on an oil pump driving system, and the injection molding process is a changed load state. Because the traditional hydraulic injection molding machine adopts a valve control mode of regulating proportional flow and proportional pressure, an oil pump motor operates at constant power so as to provide constant flow and pressure, energy loss and energy waste are caused, and the economic benefit of enterprises is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an energy-conserving plastic molding machine Variable Frequency Speed Governing (VFSG) hydraulic control system.
The utility model discloses a realize like this: a frequency conversion speed regulation hydraulic control system of a plastic molding machine comprises a PLC controller, wherein the PLC controller is connected with a servo driver, the PLC controller transmits a pressure signal and a flow signal required by equipment set according to the requirements of an injection molding process to the servo driver and switches the control signal, the servo driver adopts a high-performance digital signal processor as a control core, converts the pressure signal and the flow signal into a rotating speed and a torque to be output by a servo motor through signal processing and algorithm conversion, and drives the servo motor to operate through a power module, the servo driver is connected with a frequency converter, one end of the frequency converter is connected with the servo motor, the frequency converter provides required power voltage according to the actual requirement of the servo motor, and further achieves the purposes of energy saving and speed regulation, and a position/rotating speed sensor is arranged on the servo motor, one end of the servo motor is connected with the servo driver through a position/rotating speed sensor, the operation condition of the servo motor is fed back to the servo driver, the servo driver adjusts the output of the servo motor in real time through a frequency converter according to an actual feedback signal to achieve the servo control purpose of the servo motor and ensure the stable output of the action execution oil cylinder, the other end of the servo motor is connected with the fixed displacement pump, the servo motor drives the fixed displacement pump to run and converts the output rotating speed and the torque of the servo motor into the flow and the pressure of the outlet of the fixed displacement pump so as to drive the whole hydraulic system to operate, one end of the fixed displacement pump is connected with an oil tank through an oil conveying pipe, the other end of the fixed displacement pump is connected with the action execution oil cylinder through the oil conveying pipe, the action execution oil cylinder comprises a piston and an, the action execution oil cylinder is connected with an oil tank through an oil delivery pipe to circulate oil, a directional control electromagnetic valve is arranged on a loop formed by the oil delivery pipe between the action execution oil cylinder and the oil tank to reasonably control the working process of the action execution oil cylinder, the constant delivery pump is connected with a proportional directional flow valve through the oil delivery pipe to regulate the flow of a system, one end of the proportional directional flow valve is connected with an energy accumulator, when the instantaneous pressure of the system is increased, the energy accumulator absorbs the energy and converts the energy into compression energy to store the compression energy to ensure the normal pressure of the system, when the system needs, the energy accumulator converts the compression energy into hydraulic energy to release the hydraulic energy to supply the system, the other end of the proportional directional flow valve is connected with a valve core displacement sensor, the valve core displacement sensor is connected with a servo driver, and the running condition of a valve core is monitored, and then rationally adjust through servo driver, be provided with flowmeter and first pressure sensor on the defeated oil pipe between constant delivery pump and the proportional direction flow valve, be provided with second pressure sensor on the defeated oil pipe between proportional direction flow valve and the energy storage ware, servo driver is connected simultaneously to flowmeter, first pressure sensor and second pressure sensor, feeds back the actual flow signal of constant delivery pump and pressure signal to servo driver, and servo driver carries out real-time processing according to the flow signal and the pressure signal of feedback to servo motor's output, guarantees the stable output of constant delivery pump, reaches the servo closed loop control of whole hydraulic system.
Preferably, a one-way valve is arranged on the oil delivery pipe between the fixed displacement pump and the proportional directional flow valve, so that the circulation stability of oil in the oil delivery pipe is ensured.
Preferably, an overflow valve is arranged on an oil delivery pipe between the constant delivery pump and the proportional direction flow valve, one end of the overflow valve is connected with an oil tank, and overflowed oil returns to the oil tank along the oil delivery pipe, so that stable operation of equipment is guaranteed.
The utility model has the advantages that: the utility model has the advantages of reasonable design, the flowmeter, first pressure sensor and second pressure sensor feed back the actual flow signal of constant delivery pump and pressure signal to servo driver, servo driver is fed back to servo motor's operation conditions to position/speed sensor, servo driver passes through the converter to servo motor's output according to the flow signal of feedback and pressure signal and adjusts in real time and handle, the stable output of constant delivery pump has been guaranteed, the waste of the energy has been reduced, the economic benefits of enterprise has been improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1, a PLC controller; 2. a servo driver; 3. a frequency converter; 4. a servo motor; 5. a position/rotational speed sensor; 6. a constant delivery pump; 7. an oil delivery pipe; 8. an oil tank; 9. an action execution cylinder; 10. a piston; 11. an actuator linkage; 12. a direction control solenoid valve; 13. a proportional directional flow valve; 14. an accumulator; 15. a spool displacement sensor; 16. a flow meter; 17. a first pressure sensor; 18. a second pressure sensor; 19. a one-way valve; 20. an overflow valve.
Detailed Description
In order to understand the technical solution of the present invention more clearly, the present invention will be further explained with reference to the accompanying drawings.
The frequency-conversion speed-regulation hydraulic control system of the plastic molding machine shown in figure 1 comprises a PLC (programmable logic controller) 1, wherein the PLC 1 is connected with a servo driver 2, the PLC 1 transmits a pressure signal and a flow signal required by equipment set according to the requirements of an injection molding process to the servo driver 2 and switches the control signal, the servo driver 2 adopts a high-performance digital signal processor as a control core, the pressure signal and the flow signal are converted into a rotating speed and a torque to be output by the servo motor 4 through signal processing and algorithm conversion, the servo motor 4 is driven to operate through a power module, the servo driver 2 is connected with a frequency converter 3, one end of the frequency converter 3 is connected with the servo motor 4, the frequency converter 3 provides required power supply voltage according to the actual needs of the servo motor 4, and further achieves the purposes of energy conservation and speed regulation, a position/rotating speed sensor 5 is arranged on the servo motor 4, one end of the servo motor 4 is connected with the servo driver 2 through the position/rotating speed sensor 5, the operation condition of the servo motor 4 is fed back to the servo driver 2, the servo driver 2 adjusts the output of the servo motor 4 in real time through the frequency converter 3 according to the actual feedback signal, the servo control purpose of the servo motor 4 is achieved, the stable output of the action execution oil cylinder 9 is ensured, the other end of the servo motor 4 is connected with the fixed displacement pump 6, the servo motor 4 drives the fixed displacement pump 6 to operate, and the output rotating speed and the torque of the servo motor 4 are converted into the flow and the pressure of the outlet of the fixed displacement pump 6, so that the whole hydraulic system is driven to operate, one end of the fixed displacement pump 6 is connected with an oil tank 8 through an oil conveying pipe 7, the other end of the fixed displacement pump, the action execution oil cylinder 9 comprises a piston 10 and an execution mechanism connecting rod 11, the execution mechanism connecting rod 11 is fixedly connected with the piston 10, the action execution oil cylinder 9 is connected with an oil tank 8 through an oil pipeline 7 to circulate oil, a direction control electromagnetic valve 12 is arranged on a loop formed by the oil pipeline 7 between the action execution oil cylinder 9 and the oil tank 8 to reasonably control the working process of the action execution oil cylinder 9, the constant delivery pump 6 is connected with a proportional directional flow valve 13 through the oil pipeline 7 to adjust the flow of the system, a check valve 19 is arranged on the oil pipeline 7 between the constant delivery pump 6 and the proportional directional flow valve 13 to ensure the stable circulation of the oil in the oil pipeline 7, an overflow valve 20 is arranged on the oil pipeline 7 between the constant delivery pump 6 and the proportional directional flow valve 13, and one end of the overflow valve 20 is connected with the oil tank 8, the overflowed oil returns to an oil tank 8 along an oil delivery pipe 7 to ensure the stable operation of equipment, one end of a proportional direction flow valve 13 is connected with an energy accumulator 14, when the instantaneous pressure of the system is increased, the energy accumulator 14 absorbs the energy and converts the energy into compression energy to store the compression energy to ensure the normal pressure of the system, when the system is required, the energy accumulator 14 converts the compression energy into hydraulic energy to release the hydraulic energy to supply the system, the other end of the proportional direction flow valve 13 is connected with a valve core displacement sensor 15, the valve core displacement sensor 15 is connected with a servo driver 2, the operation condition of a valve core is monitored through the valve core displacement sensor 15, the servo driver 2 is used for reasonable adjustment, the oil delivery pipe 7 between a constant delivery pump 6 and the proportional direction flow valve 13 is provided with a flow meter 16 and a first pressure sensor 17, the oil delivery pipe 7 between the proportional direction flow valve 13 and the energy accumulator 14 is provided, the flowmeter 16, the first pressure sensor 17 and the second pressure sensor 18 are simultaneously connected with the servo driver 2, actual flow signals and pressure signals of the constant delivery pump 6 are fed back to the servo driver 2, the servo driver 2 processes the output of the servo motor 4 in real time according to the fed back flow signals and pressure signals, stable output of the constant delivery pump 6 is guaranteed, and servo closed-loop control of the whole hydraulic system is achieved.
The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (3)
1. A variable-frequency speed-regulating hydraulic control system of a plastic forming machine comprises a PLC controller and is characterized in that the PLC controller is connected with a servo driver, the servo driver is connected with a frequency converter, one end of the frequency converter is connected with a servo motor, a position/rotating speed sensor is arranged on the servo motor, one end of the servo motor is connected with the servo driver through the position/rotating speed sensor, the other end of the servo motor is connected with a constant delivery pump, one end of the constant delivery pump is connected with an oil tank through an oil delivery pipe, the other end of the constant delivery pump is connected with an action execution oil cylinder through the oil delivery pipe, the action execution oil cylinder comprises a piston and an execution mechanism connecting rod, the execution mechanism connecting rod is fixedly connected with the piston, the action execution oil cylinder is connected with the oil tank through the oil delivery pipe, and a direction control electromagnetic valve is arranged on a loop formed, the quantitative pump is connected with a proportional direction flow valve through an oil delivery pipe, one end of the proportional direction flow valve is connected with the energy accumulator, a valve core displacement sensor is connected with the other end of the proportional direction flow valve, the valve core displacement sensor is connected with a servo driver, a flow meter and a first pressure sensor are arranged on the oil delivery pipe between the quantitative pump and the proportional direction flow valve, a second pressure sensor is arranged on the oil delivery pipe between the proportional direction flow valve and the energy accumulator, and the servo driver is connected with the flow meter, the first pressure sensor and the second pressure sensor simultaneously.
2. The variable-frequency speed-regulating hydraulic control system of the plastic molding machine according to claim 1, wherein a one-way valve is arranged on an oil delivery pipe between the fixed displacement pump and the proportional directional flow valve.
3. The variable-frequency speed-regulating hydraulic control system of the plastic forming machine according to claim 1, characterized in that an overflow valve is arranged on an oil delivery pipe between the constant delivery pump and the proportional direction flow valve, and one end of the overflow valve is connected with an oil tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921011346.6U CN210100622U (en) | 2019-07-02 | 2019-07-02 | Frequency conversion speed regulation hydraulic control system of plastic forming machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921011346.6U CN210100622U (en) | 2019-07-02 | 2019-07-02 | Frequency conversion speed regulation hydraulic control system of plastic forming machine |
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| CN210100622U true CN210100622U (en) | 2020-02-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338384A (en) * | 2021-05-27 | 2021-09-03 | 三一重机有限公司 | Electrically driven positive flow hydraulic control system, method and work machine |
| CN113617855A (en) * | 2021-07-16 | 2021-11-09 | 太原科技大学 | Rolling mill control method and system |
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2019
- 2019-07-02 CN CN201921011346.6U patent/CN210100622U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338384A (en) * | 2021-05-27 | 2021-09-03 | 三一重机有限公司 | Electrically driven positive flow hydraulic control system, method and work machine |
| CN113338384B (en) * | 2021-05-27 | 2023-03-10 | 三一重机有限公司 | Electrically driven positive flow hydraulic control system, method and work machine |
| CN113617855A (en) * | 2021-07-16 | 2021-11-09 | 太原科技大学 | Rolling mill control method and system |
| CN113617855B (en) * | 2021-07-16 | 2023-02-17 | 太原科技大学 | Rolling mill control method and system |
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