CN205370659U - Hydraulic pressure governing system that steam turbine was used - Google Patents
Hydraulic pressure governing system that steam turbine was used Download PDFInfo
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- CN205370659U CN205370659U CN201620100420.1U CN201620100420U CN205370659U CN 205370659 U CN205370659 U CN 205370659U CN 201620100420 U CN201620100420 U CN 201620100420U CN 205370659 U CN205370659 U CN 205370659U
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Abstract
The utility model relates to a governing system of steam turbine especially relates to a steam turbine and adjusts the hydraulic system of usefulness to carrying out electric liquid. For the hydraulic pressure governing system energy consumption that solves current steam turbine is big, response speed reaches the problem that work efficiency is low slowly, the utility model provides a hydraulic pressure governing system that steam turbine was used is including oil sources system and servo servomotor, the oil sources system includes the energy storage ware, returns oil pipe way and two at least fuel feeding hydraulic circuit, and fuel feeding hydraulic circuit is connected with the energy storage ware, and quantitative gear pump is to energy storage ware oil charge under servo motor's drive, it is connected with the energy storage ware and is provided with the oil return ooff valve to go back to the oil pipe way, servo servomotor includes servo mechanism and the hydro -cylinder of compriseing servovalve, solenoid valve, first unloading valve and second unloading valve, be provided with the displacement sensor of the displacement volume of the piston of detection hydro -cylinder on the hydro -cylinder. The utility model discloses the hydraulic pressure governing system that steam turbine was used response rapidly, the energy consumption is low, work efficiency is high, and it is convenient to overhaul.
Description
Technical field
This utility model relates to the adjustment system of steam turbine, particularly relates to a kind of hydraulic system that steam turbine carries out electro-hydraulic adjustment.
Background technology
At present, in the hydraulic control system of existing steam turbine, oil sources part mainly adopts common three phase electric machine to coordinate constant pressure variable displacement pump output pressure that steam turbine is adjusted.This hydraulic control system is when being operated, the energy consumed has about 30-40% to be wasted because converting heat to, the oil sources part of the fire resistant oil hydraulic control system that the Steam Turbine of a such as 300MW is conventional supporting is generally adopted the threephase asynchronous of two Daeporis logical 30 kilowatts (KW), each threephase asynchronous drives the electric energy that the constant pressure variable displacement pump of a discharge capacity about 80 milliliters/turn consumes to be 30 kilowatt hours (KWH), energy expenditure is big, and threephase asynchronous also just can be able to stop after being rotated further a period of time because of the inertia of self after a loss of power, and then cause that the response speed of hydraulic control system is slow, inefficiency.Additionally, the purchase cost of constant pressure variable displacement pump that this kind of hydraulic control system adopts is higher, and system overhaul is safeguarded and is comparatively bothered.
Utility model content
Hydraulic control system energy expenditure for solving existing steam turbine is big, response speed is slow and ineffective problem, the utility model proposes the hydraulic control system of a kind of steam turbine, and this hydraulic control system includes oil supply system and Servomotor；Described oil supply system includes accumulator, return line and at least two fuel feeding hydraulic circuits, described fuel feeding hydraulic circuit is connected with described accumulator, in described fuel feeding hydraulic circuit, quantitative gear pump sucks hydraulic oil under the driving of servomotor from fuel tank and is filled in described accumulator, and is provided for oil circuit breaker valve between described quantitative gear pump and described accumulator；Described return line is connected with described accumulator, and is provided with oil return switch valve on this return line；
Described Servomotor includes servo control mechanism and oil cylinder, and described servo control mechanism includes servo valve, electromagnetic valve, the first unloader and the second unloader；The oil-in of described servo valve is connected with described fuel feeding hydraulic circuit, the oil-out of described servo valve is connected with described return line, and described first control port of servo valve is connected with the upper accent of described oil cylinder, the second control port of described servo valve is connected with the lower accent of described oil cylinder；The oil-in of described electromagnetic valve is connected with described fuel feeding hydraulic circuit, the oil-out of described electromagnetic valve is connected with described return line, and the control port of described electromagnetic valve is connected with the upper accent of described oil cylinder by described first unloader, the control port of described electromagnetic valve is passed through described second unloader and is connected with the lower accent of described oil cylinder；Described oil cylinder is provided with the displacement transducer of the displacement of detection oil cylinder piston.
Oil supply system in the hydraulic control system of steam turbine adopts servomotor and quantitative gear pump to coordinate, and system response time only has about 30 milliseconds, and rapidly, work efficiency is high in response；Servomotor adopts servo valve and the electromagnetic valve coordinated with unloader that oil cylinder is controlled, and can make oil cylinder piston fast downlink or fast uplink, thus when steam turbine or Steam Turbine are broken down, enabling steam turbine or Steam Turbine quick closedown.Additionally, oil supply system is provided with at least two fuel feeding hydraulic circuits, the redundancy forming fuel feeding hydraulic circuit is arranged, when the fuel feeding hydraulic circuit of working group breaks down or overhauls, the fuel feeding hydraulic circuit that can open standby group is hydraulic control system fuel feeding, both working group's fuel feeding hydraulic circuit was keeped in repair or overhauled by convenient for maintaining personnel, did not affect again the use of hydraulic control system, and the operation for hydraulic control system provides reliable guarantee.
Preferably, described oil supply system and the separate setting of described Servomotor, convenient install, and when oil supply system or Servomotor break down, convenient maintenance or change corresponding component.
Preferably, the oil-out place of described quantitative gear pump is disposed with single channel protection check valve and high-pressure filter.Wherein, single channel protection check valve is for avoiding the hydraulic oil in fuel feeding hydraulic circuit to be back in quantitative gear pump after fuel feeding switch valve cuts out；High-pressure filter is for making further to filter to the hydraulic oil of quantitative gear pump output, thus provide the hydraulic oil of cleaning for hydraulic control system.
Preferably; it is provided with overflow valve between described fuel feeding hydraulic circuit and return line; and the junction point between this overflow valve and described fuel feeding hydraulic circuit is between described single channel protection check valve and described confession oil circuit breaker; and the oil spilling that works when system oil pressure is higher than oil pressure map value, hydraulic control system is carried out overvoltage protection.
Preferably; described fuel feeding hydraulic circuit is provided with pressure transducer; this pressure transducer is protected on the pipeline between check valve and described accumulator in described single channel; and this pressure transducer by the pressure feedback of the hydraulic oil of described quantitative gear pump output that detects in the servo-driver of described servomotor; form closed loop control; servomotor is made to regulate rotating speed according to feedback signal; and then the pressure of the hydraulic oil of adjustment quantitative gear pump output, make the system oil pressure in hydraulic control system remain stable for.
Preferably, the oil-in place of described quantitative gear pump is provided with oil-suction oil filter, is filtered with the hydraulic oil that quantitative gear pump is sucked from fuel tank, it is prevented that have large granular impurity to be inhaled in quantitative gear pump, quantitative gear pump is caused damage.
Preferably, described return line is provided with return oil filter, so that the hydraulic oil being back in fuel tank through return line to be filtered, and then avoids the impurity in the hydraulic oil of backflow to enter in fuel tank.
Preferably, described fuel feeding hydraulic circuit is provided for oil guard check valve, and this protects between check valve and described fuel feeding switch valve for oil guard check valve in described single channel, to avoid hydraulic oil to reflux.
Preferably, select inserted valve as the first unloader and the second unloader.
The hydraulic control system of this utility model steam turbine adopts the oil supply system that servomotor and quantitative gear pump coordinate, and system response time only has about 30 milliseconds, and response is rapidly；Adopting and combined, from servo valve and the electromagnetic valve that coordinates with unloader, the Servomotor formed oil cylinder is controlled, oil cylinder piston fast downlink or fast uplink can being made, thus when steam turbine or Steam Turbine are broken down, making steam turbine or Steam Turbine quick closedown.Oil supply system is provided with at least two fuel feeding hydraulic circuits, the redundancy forming fuel feeding hydraulic circuit is arranged, when the fuel feeding hydraulic circuit of working group breaks down or overhauls, the fuel feeding hydraulic circuit that can open standby group is hydraulic control system fuel feeding, both working group's fuel feeding hydraulic circuit was keeped in repair or overhauled by convenient for maintaining personnel, not affecting again the use of hydraulic control system, the operation for hydraulic control system provides reliable guarantee.Oil supply system adopts overflow valve to carry out overvoltage protection, energy-conservation and do not generate heat, and solves the heating problem of hydraulic control system, can remove oil cooler configuration, reduce the deployment cost of hydraulic control system；Utilize pressure transducer by the pressure feedback of the hydraulic oil at the oil-out place of quantitative gear pump to the servo-driver of servomotor, form closed loop control, servomotor is made to regulate rotating speed according to feedback signal, and then the pressure of the hydraulic oil of adjustment quantitative gear pump output, make the system oil pressure in hydraulic control system remain stable for.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of the hydraulic control system of this utility model steam turbine.
Detailed description of the invention
As it is shown in figure 1, the hydraulic control system of this utility model steam turbine includes oil supply system and Servomotor.Preferably, oil supply system is independently arranged on oil sources oil path block, and Servomotor is independently arranged on servomotor oil circuit block, makes oil supply system and Servomotor separate, forms split and arranges, it is simple to installs.The quantity of Servomotor can configure as required, such as, 1 Servomotor of pure condensate crew qiting, singly take out 2 Servomotors of crew qiting, double extraction unit 3 Servomotors of configuration.
Oil supply system includes accumulator 9, return line and at least two fuel feeding hydraulic circuits, and wherein, accumulator 9 is the main power source of Servomotor.Accumulator 9 can be selected as required, and such as to select storage volume be 25 liters, storage pressure is the accumulator of 8MPa.Return line is in order to connect accumulator 9 and fuel tank, and is provided with oil return switch valve on return line, and this oil return switch valve is arranged on accumulator 9 side in order to control the switching of the return line between accumulator 9 and fuel tank.Preferably, return line is provided with return oil filter 10, and this return oil filter 10 is arranged on fuel tank side, in order to the hydraulic oil being back in fuel tank through return line is filtered.Preferably, the filtering accuracy of the built-in filter element of return oil filter 10 is 10 microns.Fuel feeding hydraulic circuit is connected with accumulator 9, quantitative gear pump 3 in fuel feeding hydraulic circuit sucks hydraulic oil under the driving of servomotor 2 from fuel tank and is filled in accumulator 9 by the hydraulic oil output of suction, and between quantitative gear pump 3 and accumulator 9, it is provided for oil circuit breaker valve, for controlling the switching of the oil feed line between accumulator 9 and quantitative gear pump 3.Preferably, servomotor 2 can be selected for the servomotor that output is 3KW.Preferably, the oil-in place of quantitative gear pump 3 is provided with oil-suction oil filter 1, is filtered for the hydraulic oil that quantitative gear pump 3 is sucked from fuel tank, to have prevented large granular impurity to be inhaled in quantitative gear pump 3, quantitative gear pump 3 is caused damage.Preferably, oil-suction oil filter 1 can be selected for the rustless steel filter element that precision is 100 orders.Preferably, the oil-out place of quantitative gear pump 3 is disposed with single channel protection check valve 4 and high-pressure filter 5, and wherein, single channel protection check valve 4 is back in quantitative gear pump 3 after fuel feeding switch valve cuts out in order to prevent the hydraulic oil in fuel feeding hydraulic circuit；The hydraulic oil that quantitative gear pump 3 is exported by high-pressure filter 5 is made further to filter, and thinks that hydraulic control system provides the hydraulic oil of cleaning.Preferably, high-pressure filter 5 can be selected for the filter element that filtering accuracy is 5 microns.Preferably; overflow valve 6 it is provided with between fuel feeding hydraulic circuit and return line; and the junction point between this overflow valve 6 and fuel feeding hydraulic circuit is between single channel protection check valve 4 and fuel feeding switch valve; namely overflow valve 6 is arranged in the high-pressure oil passage after single channel protection check valve 4; with the work oil spilling when system oil pressure is higher than oil pressure map value such as 18MPa; reduce the system oil pressure in hydraulic control system, hydraulic control system is carried out overvoltage protection.Preferably; fuel feeding hydraulic circuit is provided with pressure transducer P; this pressure transducer P protects on the pipeline between check valve 4 and accumulator 9 in single channel; and the oil pressure of quantitative gear pump 3 oil-out detected is fed back in the servo-driver of servomotor 2; form closed loop control; make servomotor 2 regulate rotating speed and then the pressure of the hydraulic oil of adjustment quantitative gear pump 3 output according to feedback signal, make the system oil pressure in hydraulic control system remain stable for.Preferably; fuel feeding hydraulic circuit is provided for oil guard check valve 8; and this confession oil guard check valve 8 protects between check valve 4 and fuel feeding switch valve in single channel to avoid hydraulic oil to reflux; and collect on pipeline for what oil guard check valve 8 may be provided at two or a plurality of fuel feeding hydraulic circuit; thus reducing the consumption that makes for oil guard check valve 8, reduce cost.Preferably, can be selected for plate-type non-return valve for oil guard check valve 8.
The operation principle of oil supply system is as follows:
Quantitative gear pump 3 starts under the driving of servomotor 2; from fuel tank, hydraulic oil (fire resistant oil or wear-resistant oil) is sucked through oil-suction oil filter 1; and the hydraulic oil of suction is converted to hydraulic oil output; and protect check valve 4, high-pressure filter 5 to be filled into accumulator 9 from the hydraulic oil of quantitative gear pump 3 output through single channel, namely oil-filled to accumulator 9；The pressure of the oil-out of quantitative gear pump 3 feeds back to after in the servo-driver of servomotor through pressure transducer P, servo-driver regulates the rotating speed of servomotor 2 according to feedback signal, and then the oil pressure of the hydraulic oil of adjustment quantitative gear pump 3 output, so that the system oil pressure in hydraulic control system remains stable for.Such as, when accumulator 9 is in oil-filled state, when the setting value of the system oil pressure in hydraulic system is 12MPa, after system oil pressure reaches 12MPa, servomotor will not rotate any more to keep system oil pressure stable；When accumulator 9 is in fuel feeding duty, the oil pressure in accumulator 9 digests reduction gradually, and after the oil pressure in accumulator 9 is reduced to the setting value 12MPa of system oil pressure, servomotor 2 raises speed immediately and drives quantitative gear pump 3 to work to replenisher force feed in accumulator 9.System oil pressure when hydraulic control system is operated can be adjusted according to the lifting force of actual valve.
When oil supply system adopts servomotor and quantitative gear pump to coordinate, system response time only has about 30 milliseconds, and compared to the variable pump systems that response time is 100 milliseconds or Constant Pump System that response time is 150 milliseconds, response speed significantly promotes.Additionally, this oil supply system utilizes pressure transducer by the pressure feedback of the oil-out of quantitative gear pump to servo-driver, form closed loop control, make the rotating speed of servomotor be adjusted according to feedback signal, and then make the system oil pressure in hydraulic control system remain stable for.
Servomotor includes servo control mechanism and oil cylinder 15, and servo control mechanism includes servo valve 11, electromagnetic valve the 12, first unloader 13.1 and the second unloader 13.2.Wherein, the oil-in of servo valve 11 is connected with fuel feeding hydraulic circuit, and the oil-out of servo valve 11 is connected with return line, and the first control port of servo valve 11 is connected with the upper accent of oil cylinder 15, and the second control port of servo valve 11 is connected with the lower accent of oil cylinder 15.Preferably, upper accent and lower accent at oil cylinder 15 are provided with pressure tap, measure with the oil pressure of the oil pressure of the upper intracavity to oil cylinder 15 and lower intracavity.Preferably, servo valve 11 can be selected for electrohydraulic servo valve or proportioning valve.The oil-in of electromagnetic valve 12 is connected with fuel feeding hydraulic circuit, the oil-out of electromagnetic valve 12 is connected with return line, and the control port of electromagnetic valve 12 is connected with the upper accent of oil cylinder 15 by the first unloader 13.1, the control port of electromagnetic valve 12 is connected with the lower accent of oil cylinder 15 by the second unloader 13.2, thus realizing the quick closing valve operation of steam turbine or Steam Turbine.Preferably, can be selected for OPC electromagnetic valve as electromagnetic valve 12, can be selected for inserted valve as the first unloader 13.1 and the second unloader 13.2.Oil cylinder 15 is provided with the displacement transducer 14 of the displacement of detection oil cylinder piston, and the displacement of the oil cylinder piston detected is fed back to digital electro-hydraulic control system (DigitalElectricHydraulicControlSystem by this displacement transducer 14, vehicle economy H) in, thus driving the corresponding actions regulating steam turbine.Preferably, displacement transducer 14 is for configure in groups, to keep feeding back in DEH the displacement of oil cylinder piston.
The operation principle of Servomotor is as follows:
The given steam turbine of DEH or Steam Turbine open big or open little obtain control instruction after, this control instruction acts on and makes its action on the servo valve 11 in servo control mechanism, the hydraulic oil in oil supply system is made to enter into the lower intracavity of oil cylinder 15, and then promote oil cylinder piston up by the oil pressure pressure reduction of intracavity on oil cylinder 15 and lower intracavity, namely move up, and fed back in DEH by displacement up for oil cylinder piston by displacement transducer 14, thus steam turbine or Steam Turbine is driven to perform the control instruction of response；Or make the hydraulic oil in oil supply system enter into the upper intracavity of oil cylinder 15, and then promote oil cylinder piston descending by the oil pressure pressure reduction of intracavity on oil cylinder 15 and lower intracavity, namely move down, and fed back in DEH by displacement descending for oil cylinder piston by displacement transducer 14, thus steam turbine or Steam Turbine is driven to perform corresponding control instruction.
When steam turbine or the Steam Turbine needs that break down are shut down or during quick closedown; electromagnetic valve 12 action makes the first unloader 13.1 and the second unloader 13.2 open; hydraulic oil is quickly filled into the upper intracavity of oil cylinder 15; and quickly shed the hydraulic oil of 15 times intracavity of oil cylinder, make oil cylinder piston fast downlink close steam turbine or Steam Turbine.It is of course also possible to closed steam turbine or Steam Turbine by oil cylinder piston fast uplink, now, electromagnetic valve 12 is connected with the lower accent of oil cylinder 15 by the first unloader 13.1, and electromagnetic valve 12 is connected with the upper accent of oil cylinder 15 by the second unloader 13.2.When using OPC electromagnetic valve to coordinate the quick closing valve operation that inserted valve realizes steam turbine or Steam Turbine, shut-in time constant was less than 0.5 second, and response is rapidly.
Claims (9)
1. the hydraulic control system of a steam turbine, it is characterised in that this hydraulic control system includes oil supply system and Servomotor；
Described oil supply system includes accumulator, return line and at least two fuel feeding hydraulic circuits, described fuel feeding hydraulic circuit is connected with described accumulator, quantitative gear pump in described fuel feeding hydraulic circuit sucks hydraulic oil under the driving of servomotor from fuel tank and is filled in described accumulator, and is provided for oil circuit breaker valve between described quantitative gear pump and described accumulator；Described return line is connected with described accumulator, and is provided with oil return switch valve on this return line；
Described Servomotor includes servo control mechanism and oil cylinder, and described servo control mechanism includes servo valve, electromagnetic valve, the first unloader and the second unloader；The oil-in of described servo valve is connected with described fuel feeding hydraulic circuit, the oil-out of described servo valve is connected with described return line, and described first control port of servo valve is connected with the upper accent of described oil cylinder, the second control port of described servo valve is connected with the lower accent of described oil cylinder；The oil-in of described electromagnetic valve is connected with described fuel feeding hydraulic circuit, the oil-out of described electromagnetic valve is connected with described return line, and the control port of described electromagnetic valve is connected with the upper accent of described oil cylinder by described first unloader, the control port of described electromagnetic valve is passed through described second unloader and is connected with the lower accent of described oil cylinder；Described oil cylinder is provided with the displacement transducer of the displacement of detection oil cylinder piston.
2. the hydraulic control system of steam turbine according to claim 1, it is characterised in that described oil supply system and the separate setting of described Servomotor.
3. the hydraulic control system of steam turbine according to claim 1 and 2, it is characterised in that the oil-out place of described quantitative gear pump is disposed with single channel protection check valve and high-pressure filter.
4. the hydraulic control system of steam turbine according to claim 3; it is characterized in that; it is provided with overflow valve between described fuel feeding hydraulic circuit and return line, and the junction point between this overflow valve and described fuel feeding hydraulic circuit protects check valve and described between oil circuit breaker in described single channel.
5. the hydraulic control system of steam turbine according to claim 4; it is characterized in that; described fuel feeding hydraulic circuit is provided with pressure transducer; this pressure transducer is protected on the pipeline between check valve and described accumulator in described single channel, and this pressure transducer is by the pressure feedback of the hydraulic oil of described quantitative gear pump output that detects to the servo-driver of described servomotor.
6. the hydraulic control system of steam turbine according to claim 1 and 2, it is characterised in that the oil-in place of described quantitative gear pump is provided with oil-suction oil filter.
7. the hydraulic control system of steam turbine according to claim 1 and 2, it is characterised in that be provided with return oil filter on described return line.
8. the hydraulic control system of steam turbine according to claim 3, it is characterised in that be provided for oil guard check valve on described fuel feeding hydraulic circuit, and this is protected between check valve and described fuel feeding switch valve in described single channel for oil guard check valve.
9. the hydraulic control system of steam turbine according to claim 1 and 2, it is characterised in that select inserted valve as the first unloader and the second unloader.
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| CN201620100420.1U CN205370659U (en) | 2016-02-01 | 2016-02-01 | Hydraulic pressure governing system that steam turbine was used |
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| CN201620100420.1U CN205370659U (en) | 2016-02-01 | 2016-02-01 | Hydraulic pressure governing system that steam turbine was used |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812558A (en) * | 2017-01-05 | 2017-06-09 | 武汉船用机械有限责任公司 | A kind of revolution speed control device of steam turbines |
| CN107939457A (en) * | 2017-11-17 | 2018-04-20 | 成都新华控制工程有限公司 | A kind of new servomotor system and used control method |
| CN110067606A (en) * | 2019-04-13 | 2019-07-30 | 大唐双鸭山热电有限公司 | The oil motor for avoiding steam turbine low-key badge puckery |
| CN110593965A (en) * | 2019-08-19 | 2019-12-20 | 北京博力威格智能传控设备有限公司 | Main valve shutoff valve group, control method thereof and steam turbine |
| CN112160803A (en) * | 2020-10-20 | 2021-01-01 | 中广核核电运营有限公司 | Method for flushing regulating oil system of steam turbine of nuclear power station |
| CN112943717A (en) * | 2021-01-28 | 2021-06-11 | 华电通用轻型燃机设备有限公司 | Hydraulic starting system for aeroderivative gas turbine generator set |
| CN114109939A (en) * | 2021-11-10 | 2022-03-01 | 凤凰汇通(杭州)科技有限公司 | Energy-saving hydraulic system for servo control of high-speed movement of oil cylinder |
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2016
- 2016-02-01 CN CN201620100420.1U patent/CN205370659U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812558A (en) * | 2017-01-05 | 2017-06-09 | 武汉船用机械有限责任公司 | A kind of revolution speed control device of steam turbines |
| CN106812558B (en) * | 2017-01-05 | 2018-10-23 | 武汉船用机械有限责任公司 | A kind of revolution speed control device of steam turbines |
| CN107939457A (en) * | 2017-11-17 | 2018-04-20 | 成都新华控制工程有限公司 | A kind of new servomotor system and used control method |
| CN110067606A (en) * | 2019-04-13 | 2019-07-30 | 大唐双鸭山热电有限公司 | The oil motor for avoiding steam turbine low-key badge puckery |
| CN110593965A (en) * | 2019-08-19 | 2019-12-20 | 北京博力威格智能传控设备有限公司 | Main valve shutoff valve group, control method thereof and steam turbine |
| CN110593965B (en) * | 2019-08-19 | 2022-08-09 | 北京博力威格智能传控设备有限公司 | Main valve shutoff valve group, control method thereof and steam turbine |
| CN112160803A (en) * | 2020-10-20 | 2021-01-01 | 中广核核电运营有限公司 | Method for flushing regulating oil system of steam turbine of nuclear power station |
| CN112160803B (en) * | 2020-10-20 | 2022-12-09 | 中广核核电运营有限公司 | Method for flushing regulating oil system of steam turbine of nuclear power station |
| CN112943717A (en) * | 2021-01-28 | 2021-06-11 | 华电通用轻型燃机设备有限公司 | Hydraulic starting system for aeroderivative gas turbine generator set |
| CN114109939A (en) * | 2021-11-10 | 2022-03-01 | 凤凰汇通(杭州)科技有限公司 | Energy-saving hydraulic system for servo control of high-speed movement of oil cylinder |
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