CN220204220U - Energy-saving servo control system of hydraulic station - Google Patents
Energy-saving servo control system of hydraulic station Download PDFInfo
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- CN220204220U CN220204220U CN202321195426.8U CN202321195426U CN220204220U CN 220204220 U CN220204220 U CN 220204220U CN 202321195426 U CN202321195426 U CN 202321195426U CN 220204220 U CN220204220 U CN 220204220U
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- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
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- 238000004146 energy storage Methods 0.000 description 2
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Abstract
The utility model discloses an energy-saving servo control system of a hydraulic station, which consists of an oil tank, an oil pump, a motor, a reversing valve, an oil cylinder, a pressure sensor and an electrohydraulic servo driver, wherein the oil pump is a constant delivery pump, the motor is a servo motor, the pressure sensor is used for collecting a pressure signal in a hydraulic oil path and transmitting the pressure signal to the electrohydraulic servo driver, the electrohydraulic servo driver is connected with and controls the rotating speed or torque of the servo motor, and the servo motor is connected with and drives the constant delivery pump to output the required flow. The hydraulic station is driven by modifying the hydraulic station into a servo motor and a constant displacement pump, and pressure and flow signals are subjected to closed-loop control through a pressure sensor and an electrohydraulic servo driver, so that the hydraulic station can be started and stopped at any time to be supplied as required, and almost no overflow is generated, thereby bringing an energy-saving effect.
Description
Technical Field
The utility model relates to the technical field of hydraulic stations, in particular to an energy-saving servo control system of a hydraulic station.
Background
The hydraulic system is a transmission mode frequently adopted in modern electromechanical equipment, an oil pump is used as a power source, and a pressure control object realizes industry and equipment upgrading through servo; the hydraulic system is widely applied, is helpful to things around and improves the working efficiency. The hydraulic system is mainly matched with the traditional industry, construction, wind power generation, agriculture, sanitation, metallurgy, mine, ship and the like, and has industry status in the aspects of wind power generation, plastic machinery, sanitation machinery, mining machinery, machine tools, metallurgy machinery and ship cranes.
As shown in fig. 1, the hydraulic station is a hydraulic source device including a hydraulic oil pump 20, a driving motor 30, a tank 10, a reversing valve 50, a throttle valve, a relief valve 40, and the like, or a hydraulic device including a control valve. The hydraulic station is connected with the driving device (oil cylinder or motor) by an oil pipe, and the hydraulic system can realize various specified actions. The output end of the oil pump 20 is also connected with an energy storage tank 70 through a one-way valve 80, and the existing hydraulic control system has high energy consumption, large volume and high noise. The scheme of the asynchronous machine and the constant displacement pump is constant supply, when the oil cylinder stops moving, the motor pump set still operates, the output energy overflows completely, waste is generated, and the later scheme of the variable displacement pump and the asynchronous motor realizes supply change, but the asynchronous motor cannot stop when the oil pump displacement cannot be completely changed to 0, so waste is also generated.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an energy-saving servo control system of a hydraulic station, which can be started and stopped at any time to be supplied as required, and hardly generates overflow, thereby bringing an energy-saving effect.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the utility model provides an energy-conserving servo control system of hydraulic pressure station, comprises oil tank, oil pump, motor, switching-over valve and hydro-cylinder, still includes pressure sensor, electrohydraulic servo driver, the oil pump is the constant delivery pump, the motor is servo motor, pressure sensor is used for gathering the pressure signal in the hydraulic circuit and transmits to electrohydraulic servo driver, electrohydraulic servo driver connection control servo motor's rotational speed or moment of torsion, servo motor connection drive the required flow of constant delivery pump output.
Further, the servo motor is an IPM motor. Because the magnetic poles of the quadrature axis magnetic circuit and the direct axis magnetic circuit of the IPM motor are different, in the operation of the motor, the motor can generate additional magnetic pole torque besides normal electromagnetic torque, the combination of the two is called as combined torque, and the SPM only has electromagnetic torque; the IPM machine resultant torque maximum is greater than the SPM machine electromagnetic torque maximum.
Further, the constant-pressure variable displacement plunger pump is used as the constant-pressure variable displacement plunger pump.
Further, the hydraulic station energy-saving servo control system further comprises a displacement sensor, wherein the displacement sensor is connected with the electrohydraulic servo driver and is used for collecting the displacement of the actuating element in the oil cylinder.
Further, the hydraulic station energy-saving servo control system further comprises a PLC control module, and the PLC control module is connected with the electrohydraulic servo driver.
Furthermore, the hydraulic station energy-saving servo control system further comprises an HMI display screen, wherein the HMI display screen is connected with the PLC control module through an RS485 interface, and pressure and flow signals are set for the PLC control module through the HMI display screen.
Optionally, the energy-saving servo control system of the hydraulic station further comprises a filter and a pressure gauge, wherein the pressure gauge is used for collecting a pressure value at the front end of the oil pump, the filter and an overflow valve are connected to the oil tank in parallel, the tail end of the filter is connected with the oil pump, and the oil pump drives the oil cylinder through the reversing valve.
The utility model has the beneficial effects that:
according to the energy-saving servo control system for the hydraulic station, the hydraulic station is driven in a mode of being transformed into the servo motor and the constant displacement pump, the pressure and flow signals are subjected to closed-loop control through the pressure sensor and the electrohydraulic servo driver, the hydraulic station can be started and stopped at any time and supplied according to requirements, overflow is hardly generated, and therefore an energy-saving effect is achieved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydraulic control system of a conventional hydraulic station;
FIG. 2 is a schematic diagram of a first hydraulic station energy-saving servo control system according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a second hydraulic station energy-saving servo control system according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of an energy-saving servo control system for a hydraulic station according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of an electro-hydraulic servo driver wiring according to an embodiment of the present utility model;
FIG. 6 is a table showing the comparison of different load duty ratio electric charges of a common hydraulic station according to an embodiment of the present utility model;
in the figure, 10-oil tank, 20-oil pump, 30-motor, 40-overflow valve, 50-reversing valve, 60-hydro-cylinder, 70-energy storage tank, 80-check valve, 90-actuator, 100-filter, 110-manometer, 120-pressure sensor, 130-electrohydraulic servo driver, 140-displacement sensor, 150-PLC control module, 160-HMI display screen.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1
As shown in fig. 2, the embodiment of the utility model provides an energy-saving servo control system of a hydraulic station, which consists of an oil tank 10, an oil pump 20, a motor 30, a reversing valve 50, an oil cylinder 60, a pressure sensor 120 and an electrohydraulic servo driver 130, wherein the oil pump 20 is a constant delivery pump, the motor 30 is a servo motor, the pressure sensor 120 is used for collecting a pressure signal in a hydraulic oil path and transmitting the pressure signal to the electrohydraulic servo driver 130, the electrohydraulic servo driver 130 is connected and controls the rotating speed or torque of the servo motor, and the servo motor is connected and drives the flow required by the output of the constant delivery pump. Specifically, the energy-saving servo control system of the hydraulic station adopts a servo motor and a constant displacement pump, and the driver executes a speed closed-loop control mode before the set pressure is not reached, so that the motor runs at the set maximum rotation speed. After the set pressure is reached, the driver executes a pressure closed-loop control mode, and the servo system is only responsible for maintaining the constant pressure and self-adapting the speed. Speed control mode-motor speed; pressure control mode-motor torque.
As shown in fig. 4, it is assumed that the required flow rate when all the devices operate simultaneously is Q, where Q1 is the output flow rate (dashed line) of the original asynchronous machine scheme, the operating time is that the output flow rate after energy-saving modification is a real waveform line, and the non-operating time is T21, T22, T23 (i.e. the sum of the time T1 of the output flow rate Q is 0, the energy-saving rate is calculated as follows:
energy saving ratio = flow ratio = dead time ratio = (t21+t22+t23) T1 x 100% (i.e. the ratio of load dead time to total duty cycle in one complete duty cycle).
Taking a common hydraulic station as an example, the load non-working time of a single motor is 30%, 40%, 50% and 60% and the current of a 75KW motor is calculated to be about 93A, and the current always runs, which is approximately equivalent to that of a 46KW motor to always load and work, namely 46 degrees of electricity consumption month are used for one hour, 7500 hours are calculated for one year, and the electricity charge is 0.7 yuan/degree, and the energy-saving cost is shown in fig. 6:
annual electricity saving cost=46 degrees 7500h 0.7 yuan 30% = 72450 yuan (duty cycle 30%)
The total power of the hydraulic station installation is generally 1500-3000 kw, and the electricity saving rate is 242-484W/year according to the average 50% energy saving rate.
Specifically, the servo motor is an IPM motor. Because the magnetic poles of the quadrature axis magnetic circuit and the direct axis magnetic circuit of the IPM motor are different, in the operation of the motor, the motor can generate additional magnetic pole torque besides normal electromagnetic torque, the combination of the two is called as combined torque, and the SPM only has electromagnetic torque; the IPM machine resultant torque maximum is greater than the SPM machine electromagnetic torque maximum.
Specifically, the constant-pressure variable displacement plunger pump is used as the constant-pressure variable displacement plunger pump.
As shown in FIG. 4, the electro-hydraulic servo driver may employ an ES660 series driver, where Dl1 is a driver enable signal; AI1, given pressure signal; AI2, given flow model; AI3, pressure sensor feedback signal; 15V, supplying power to the pressure sensor; GND, the pressure sensor is grounded; T/A1 is a public end; T/B1 is normally closed signal; T/C1 is a normally open signal; U/V/W, three-phase 380V input; U/V/W, three-phase 380V output.
Software: the weak magnetic control level is improved by 10%; the software algorithm with stronger response and impact inhibition is proposed, and the indexes can be that under 140Kgf pressure, the pressure fluctuation is controlled to be 0.35Kgf175kgf full-speed full-pressure response to be 47ms when the rotation speed of an oil pump is 20rpm, the pressure overshoot is 5Kgf, the pressure release time is 112ms, and the pressure oscillation is 1Kgf.
The inductance of the direct current reactor is increased at the side of the rectifier bridge with the hardware of more than 30kW, the specification is improved, and the protection of the rectifier bridge is enhanced. The IGBT module adopts the IGBT module of the fourth generation KT4, and the service life of the IGBT module is 2.5 to 3 times longer than that of the third generation KT3, so that the IGBT module has the characteristics of stronger stability, small thermal margin, high junction temperature and the like, and the service stability of equipment is greatly improved.
The integral bus capacitor is updated to a high-temperature long-life capacitor from 85 ℃, the theoretical service life of the capacitor is prolonged by 4 times, the redesign of an absorption braking electric circuit for impact and drop of a power grid is enhanced, the intelligent detection is realized, and the capacitor can be built in under 75 KW.
As shown in fig. 2, the hydraulic station energy-saving servo control system further includes a displacement sensor 140, where the displacement sensor 140 is connected to the electrohydraulic servo driver 130, and is used for collecting the displacement of the actuator 90 in the oil cylinder 60.
As shown in fig. 3, the hydraulic station energy-saving servo control system further includes a PLC control module 150, and the PLC control module 150 is connected to the electrohydraulic servo driver 130.
As shown in fig. 3, the hydraulic station energy-saving servo control system further includes an HMI display 160, where the HMI display 160 is connected with the PLC control module 150 through an RS485 interface, and pressure and flow signals are set to the PLC control module 150 through the HMI display 160.
Optionally, the hydraulic station energy-saving servo control system further includes a filter 100 and a pressure gauge 110, the pressure gauge 110 is used for collecting a pressure value at the front end of the oil pump 20, the filter 110 and an overflow valve 40 are connected to the oil tank 10 in parallel, the tail end of the filter 110 is connected with the oil pump 20, and the oil pump 20 drives the oil cylinder 60 through the reversing valve 50.
According to the energy-saving servo control system for the hydraulic station, the hydraulic station is driven in a mode of being transformed into the servo motor and the constant displacement pump, the pressure and flow signals are subjected to closed-loop control through the pressure sensor and the electrohydraulic servo driver, the hydraulic station can be started and stopped at any time and supplied according to requirements, overflow is hardly generated, and therefore an energy-saving effect is achieved.
The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and yet fall within the scope of the utility model.
Claims (7)
1. The utility model provides an energy-conserving servo control system of hydraulic pressure station, comprises oil tank, oil pump, motor, switching-over valve and hydro-cylinder, its characterized in that still includes pressure sensor, electrohydraulic servo driver, the oil pump is the constant delivery pump, the motor is servo motor, pressure sensor is used for gathering the pressure signal in the hydraulic circuit and transmits to electrohydraulic servo driver, electrohydraulic servo driver connection control servo motor's rotational speed or moment of torsion, servo motor connection drive the required flow of constant delivery pump output.
2. The hydraulic station energy efficient servo control system of claim 1, wherein the servo motor is an IPM motor.
3. The hydraulic station energy-saving servo control system of claim 1, wherein the constant displacement pump is a constant pressure variable displacement pump.
4. The hydraulic station energy-saving servo control system according to claim 1, further comprising a displacement sensor connected to the electrohydraulic servo driver for acquiring the displacement of the actuator in the cylinder.
5. The hydraulic station energy-efficient servo control system of claim 1, further comprising a PLC control module coupled to the electro-hydraulic servo driver.
6. The hydraulic station energy-saving servo control system according to claim 5, further comprising an HMI display screen, wherein the HMI display screen is connected with the PLC control module through an RS485 interface, and pressure and flow signals are set to the PLC control module through the HMI display screen.
7. The hydraulic station energy-saving servo control system according to claim 1, further comprising a filter and a pressure gauge, wherein the pressure gauge is used for collecting a pressure value of the front end of the oil pump, the filter and an overflow valve are connected in parallel to the oil tank, the tail end of the filter is connected with the oil pump, and the oil pump drives the oil cylinder through the reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321195426.8U CN220204220U (en) | 2023-05-16 | 2023-05-16 | Energy-saving servo control system of hydraulic station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321195426.8U CN220204220U (en) | 2023-05-16 | 2023-05-16 | Energy-saving servo control system of hydraulic station |
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| CN220204220U true CN220204220U (en) | 2023-12-19 |
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| CN202321195426.8U Active CN220204220U (en) | 2023-05-16 | 2023-05-16 | Energy-saving servo control system of hydraulic station |
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- 2023-05-16 CN CN202321195426.8U patent/CN220204220U/en active Active
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