CN100451336C - Low idling energy consumption hydraulic power source - Google Patents
Low idling energy consumption hydraulic power source Download PDFInfo
- Publication number
- CN100451336C CN100451336C CNB2006100124743A CN200610012474A CN100451336C CN 100451336 C CN100451336 C CN 100451336C CN B2006100124743 A CNB2006100124743 A CN B2006100124743A CN 200610012474 A CN200610012474 A CN 200610012474A CN 100451336 C CN100451336 C CN 100451336C
- Authority
- CN
- China
- Prior art keywords
- pump
- hydraulic
- motor
- control
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
The present invention relates to a low idling energy consumption hydraulic power source, which belongs to the technical field of fluid drive and control. The present invention is an oil supplying device used for reducing the energy consumption of a hydraulic system in the non-work period or partial load work condition. The present invention is composed of a hydraulic pump 1, a motor 2, a motor speed controller 3, an energy accumulator 4, an electromagnetic valve 5, a pressure sensor 6, a displacement sensor 7, a controller 8, pipelines 9 and 10, a proportional valve of a control executor 11, direction valves 12 and 13, etc. components. The present invention is characterized in that the hydraulic pump 1 is a constant pressure variable pump, the displacement sensor 7 is additionally arranged on the hydraulic pump 1, and the displacement sensor 7 is used for detecting the pump displacement; the present invention has a complex function of constant pressure, constant flow and constant power control by altering the rotation speed of the hydraulic pump 1; the power consumption of the hydraulic system is reduced by reducing the rotation speed of the hydraulic pump 1 in the non-work period or partial load work condition.
Description
One, technical field:
Low idling energy consumption hydraulic power source of the present invention belongs to fluid transmission and control technique field, is the power source that certain pressure and flow are provided for hydraulic actuator.
Two, background technique:
Hydraulic power supply is fluid transmission and control system for final controlling element provides the unit of power, and it is converted to the hydraulic pressure energy with certain pressure and flow with mechanical energy, is used to drive oil hydraulic cylinder and oil hydraulic motor.Traditional hydraulic power supply by the changeless motoring of rotating speed quantitatively or the variable liquid pump form.For with load matched, cut down the consumption of energy, developed the volume adjustable hydraulic pump of various ways in the world.Variable displacement pump commonly used has constant voltage, constant current and three kinds of forms of permanent power.The work characteristics of constant pressure type variable displacement pump is when system works pressure is lower than the setting pressure of pump, pump is exported the peak rate of flow under the corresponding rotating speed, and when system works pressure reached the pressure set points of pump, the flow of pump output adapted to load request automatically, reduced the energy consumption relevant with flow.Constant current mode variable displacement pump output and the corresponding to flow of setting value, pressure then adapt with the load of system, reduce the energy loss with pressure correlation.The output power of permanent power and variable pump restrictive pump is consistent with setting value, and the product of POF and pressure is remained unchanged.These three kinds of pumps are compared with the power source of forming with metering pump, though all reduced the energy consumption of system to a certain extent, but test shows, when system is in inoperative during the cycle, be in the drain charge operating mode of low pressure and mass flow as pump, pump is in high-pressure low-flow operating mode etc., and motor still with the rated speed running, produce bigger energy loss.
In order to reduce the inoperative cycle, the energy loss that still causes because of motor with rated speed running, a kind of new trend is to come the flow and the pressure of control pump by the rotating speed that changes oil hydraulic pump, the useful AC asynchronous motor of the control mode that has occurred, by changing the flow and the pressure of the output of rotating speed control quantitative hydraulic pump, European patent, publication number EP 0752304 A1; With the asynchronous motor of speed variable, in conjunction with the flow and the pressure of ratio pressure and Flow valve and metering pump composition power source control supply system, European patent, publication number EP 0,509 724 A1, their deficiency is that dynamic response is slower; In German patent DE 3919823 A1, with the output flow and the pressure of actuating motor control quantitative hydraulic pump, the problem of existence is the cost height, influences its promotion and application; German also someone studies output flow and the pressure with the change displacement hydraulic pump composite control pump of the AC asynchronous motor of speed variable and electronics proportional control, and the deficiency of existence remains the cost height, and the system that forms is also very complicated.Low idling energy consumption hydraulic power source purpose of the present invention is, provide a kind of new variable speed electric motors, particularly and volume adjustable hydraulic pump compound mode as hydraulic power supply, promptly has low cost, good dynamic response can satisfy functional requirement and the energy consumption in reduction inoperative cycle of various hydraulic systems to power source again.
Three, summary of the invention
Purpose of the present invention is intended to reduce existing hydraulic power supply mechanical energy is converted to the energy loss of hydraulic pressure in can process, realizes energy-conservation.Hydraulic power supply is the unit that power is provided for fluid transmission and control system, and it is converted to the hydraulic pressure energy with certain pressure and flow with mechanical energy, is used for driving oil hydraulic cylinder or oil hydraulic motor.
A kind of low idling energy consumption hydraulic power source of the present invention, it includes oil hydraulic pump 1, motor 2, accumulator 4, solenoid valve 5, it is characterized in that oil hydraulic pump 1 is the volume adjustable hydraulic pump of constant pressure type, and has set up motor speed controller 3, pressure transducer 6, displacement transducer 7 and controller 8; Pressure transducer 6 is installed in first hydraulic pipe line 9 that connects pump discharge, the actual pressure of detection system, and be converted into electrical signal and be input in the controller 8; Displacement transducer 7 is installed in the oil hydraulic pump 1, the pivot angle of testing pump stroking mechanism, and its value is converted to electrical signal is input in the controller 8; Accumulator is connected to the outlet of oil hydraulic pump 1 by first hydraulic pipe line 9, second hydraulic pipe line 10, and the break-make of solenoid valve 5 control accumulators is housed between first hydraulic pipe line 9 and second hydraulic pipe line 10; Controller 8 provides the command signal U of control motor speed according to the traffic requirement of actuator control valves 11,12,13
fIn motor speed controller 3, and, speed setting value is revised with the signal of pressure transducer 6 that receives and displacement transducer 7; Rotational speed governor 3 control rotating speed of motor and power. Actuator control valves 11,12,13 is used to control the moving direction and the speed of final controlling element, and final controlling element can be 1,2 or a plurality of in the system.
Above-mentioned low idling energy consumption hydraulic power source is characterized in that oil hydraulic pump 1 is the artificial constant pressure type variable displacement pump of adjusting of machinery control or with the self-adjusting electric-hydraulic proportion constant pressure variable displacement pump of electrical signal.
Above-mentioned low idling energy consumption hydraulic power source is characterized in that motor 2 is AC induction motor, AC servo motor or closes reluctance motor.
Above-mentioned low idling energy consumption hydraulic power source, but it is characterized in that motor speed controller 3 is that frequency variator, the control motor of continuous control motor speed has only several other controllers of fixed rotating speed level, or soft starting device.
Low idling energy consumption hydraulic power source major advantage of the present invention is embodied in, and I, is in inoperatives such as low pressure, drain charge during the cycle when hydraulic system, by reducing the rotating speed of oil hydraulic pump, will greatly reduce the energy loss that produces with the rated speed rotation because of oil hydraulic pump.II, in the working procedure of hydraulic system, by improving the rotating speed of pump, can strengthen the fuel supply flow rate of system, reduce the volume of selected pump.III, be in the function of permanent power working state, thereby also make the superposeed feature of permanent power control of this power source because motor speed controller itself just has the control motor.IV, by changing the rotating speed of pump, make pump have the compound control function of pressure and flow, can realize the flow matches control of multi executors.V, pivot angle and delivery pressure by the testing pump stroking mechanism cooperate rotating speed of motor, can realize the efficiency optimization control of power source.The present invention can replace existing hydraulic power supply, is widely used in the hydraulic industry field, realizes energy-conservation.
Four, description of drawings
Fig. 1 low idling energy consumption hydraulic power source.Wherein
The 1-oil hydraulic pump 2-motor 3-motor speed controller 4-accumulator 5-solenoid valve 6-pressure transducer 7-displacement transducer 8-controller 9-first hydraulic pipe line 10-second hydraulic pipe line 11,12,13-actuator control valves
Below in conjunction with accompanying drawing principle of the present invention and structure are described in further detail.
Low idling energy consumption hydraulic power source of the present invention is by hydraulic pump 1, motor 2, motor speed controller 3, the displacement of the magnetic valve 5 of accumulator 4, switching regulator, pressure sensor 6, testing pump discharge capacity (pivot angle) Sensor 7, controller 8, the first fluid pressure lines 9, second fluid pressure line 10, actuator control valves 11, 12, the parts such as 13 form. Wherein, hydraulic pump 1 adopts mechanical constant pressure type variable pump or electronics ratio The constant pressure type variable pump of control is characterized in when system pressure is lower than the setting pressure of this pump, and pump is exported The big corresponding flow of discharge capacity. And after system pressure reached its setting value, the output flow of pump adapted to automatically Load request. Motor 2 is the prime mover that drive hydraulic pump, changes electric energy into mechanical energy. Motor speed The effect of controller 3 is the speed of control electric machine rotation, also can play limiting motor output torque and merit simultaneously The purpose of rate. The effect of accumulator 4 is the hydraulic oil that stores certain pressure, hydraulic pump in the compensation dynamic process For the required flow of shortage of oil. The duty of magnetic valve 5 control accumulators is to disconnect or connection. Pressure Sensor 6 detects and the actual pressure value in monitoring hydraulic pump exit, and is converted into the signal of telecommunication and offers Controller 8. Displacement transducer 7 is used for detecting the pivot angle of hydraulic pump stroking mechanism, and this signal is transformed For the signal of telecommunication is input to controller 8. The effect of controller 8 is duty, the pressure sensings according to system The information that device 6 and displacement transducer 7 provide, the velocity of rotation of control motor, and the maximum of limiting motor Power output. Actuator control valves 11,12,13 is used for the direction of motion and the speed of control executing agency.
The course of work of this power source is: at first according to the movement velocity of load, when being the multi executors operating mode The time, according to the speed of each actuator and, determine the rotating speed of motor by the maximum pump discharge of pump, and this established Definite value offers motor speed controller 3, when system pressure is lower than the setting value of hydraulic pump, by detecting System pressure value and hydraulic pressure pump delivery, according to the leakage characteristics of pump, the rotating speed of pump is revised. When When system is in maximum pressure, adapt to the required flow of load by changing simultaneously pump delivery and rotating speed. When After the power output of pump surpassed the set value of the power of motor, rotational speed governor will reduce motor automatically Rotating speed, the power output of restriction hydraulic pump. When all actuators were not worked, the rotating speed of control pump was certain One minimum, system is in the low energy consumption duty. If at this moment certain actuator starts suddenly, for full The requirement of foot dynamic characteristic can open accumulator 4 by control magnetic valve 5, replenishes flow.
Five, embodiment
Mode of execution 1:
In the embodiment depicted in fig. 1, oil hydraulic pump 1 adopts the first guide structure constant pressure variable displacement pump of machinery control, motor 2 adopts AC asynchronous motor, motor speed controller 3 is selected the frequency variator of vector control mode for use, accumulator 4 is selected bladder structure for use, solenoid valve 5 is selected 2 two-way electromagnetic valves of 10 latus rectums for use, and it is 0-35MPa that pressure transducer 6 selects measuring range, and is integrated with preamplifier.Displacement transducer 7 is selected the differential transformer principle for use, and controller 8 is made of calculator chip.
Mode of execution 2:
The difference of present embodiment and mode of execution 1 is the constant pressure variable displacement pump that the constant pressure variable displacement pump of machinery control in the mode 1 is changed into the electronics proportional control, and motor speed controller 3 is selected soft initiator for use, the remaining part unanimity.
Mode of execution 3:
The difference of present embodiment and mode of execution 1 is that the AC asynchronous motor that will adopt in the mode 1 changes AC servo motor into, the remaining part unanimity.
Claims (4)
1, a kind of low idling energy consumption hydraulic power source, it includes oil hydraulic pump (1), motor (2), accumulator (4), solenoid valve (5), it is characterized in that oil hydraulic pump (1) is the volume adjustable hydraulic pump of constant pressure type, and has set up motor speed controller (3), pressure transducer (6), displacement transducer (7) and controller (8); Pressure transducer (6) is installed in first hydraulic pipe line (9) that connects pump discharge, the actual pressure of detection system, and be converted into electrical signal and be input in the controller (8); Displacement transducer (7) is installed in the oil hydraulic pump (1), the pivot angle of testing pump stroking mechanism, and its value is converted to electrical signal is input in the controller (8); Accumulator is connected to the outlet of oil hydraulic pump (1) by first hydraulic pipe line (9), second hydraulic pipe line (10), and the break-make of solenoid valve (5) control accumulator is housed between first hydraulic pipe line (9) and second hydraulic pipe line (10); Controller (8) provides the command signal U of control motor speed according to the traffic requirement of actuator control valves (11), (12), (13)
fIn the motor speed controller (3), and, speed setting value is revised with the signal of pressure transducer that receives (6) and displacement transducer (7); Rotational speed governor (3) control rotating speed of motor and power; Actuator control valves (11), (12), (13) are used to control the moving direction and the speed of final controlling element, and final controlling element can be 1,2 or a plurality of in the system.
2, low idling energy consumption hydraulic power source according to claim 1 is characterized in that oil hydraulic pump (1) is the artificial constant pressure type variable displacement pump of adjusting of machinery control or with the self-adjusting electric-hydraulic proportion constant pressure variable displacement pump of electrical signal.
3, low idling energy consumption hydraulic power source according to claim 1 is characterized in that motor (2) is AC induction motor, AC servo motor or switched reluctance machines.
4, low idling energy consumption hydraulic power source according to claim 1, it is characterized in that motor speed controller (3) but be that frequency variator, the control motor of continuous control motor speed has only several other controllers of fixed rotating speed level, or soft starting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100124743A CN100451336C (en) | 2006-03-07 | 2006-03-07 | Low idling energy consumption hydraulic power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100124743A CN100451336C (en) | 2006-03-07 | 2006-03-07 | Low idling energy consumption hydraulic power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1821574A CN1821574A (en) | 2006-08-23 |
| CN100451336C true CN100451336C (en) | 2009-01-14 |
Family
ID=36923109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100124743A Expired - Fee Related CN100451336C (en) | 2006-03-07 | 2006-03-07 | Low idling energy consumption hydraulic power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100451336C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI730404B (en) * | 2018-09-12 | 2021-06-11 | 日商住友精密工業股份有限公司 | Constant pressure liquid supply device |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8540493B2 (en) | 2003-12-08 | 2013-09-24 | Sta-Rite Industries, Llc | Pump control system and method |
| US7854597B2 (en) | 2004-08-26 | 2010-12-21 | Pentair Water Pool And Spa, Inc. | Pumping system with two way communication |
| US8480373B2 (en) | 2004-08-26 | 2013-07-09 | Pentair Water Pool And Spa, Inc. | Filter loading |
| US7874808B2 (en) | 2004-08-26 | 2011-01-25 | Pentair Water Pool And Spa, Inc. | Variable speed pumping system and method |
| US7686589B2 (en) | 2004-08-26 | 2010-03-30 | Pentair Water Pool And Spa, Inc. | Pumping system with power optimization |
| US8469675B2 (en) | 2004-08-26 | 2013-06-25 | Pentair Water Pool And Spa, Inc. | Priming protection |
| US7845913B2 (en) | 2004-08-26 | 2010-12-07 | Pentair Water Pool And Spa, Inc. | Flow control |
| US8602745B2 (en) | 2004-08-26 | 2013-12-10 | Pentair Water Pool And Spa, Inc. | Anti-entrapment and anti-dead head function |
| GB0614940D0 (en) * | 2006-07-27 | 2006-09-06 | Arternis Intelligent Power Ltd | Vehicle traction and stability control system employing control of fluid quanta |
| ES2773888T3 (en) | 2008-10-06 | 2020-07-15 | Danfoss Low Power Drives | Method of operating a vacuum release safety system |
| JP5604615B2 (en) * | 2009-03-23 | 2014-10-08 | 佐藤 寛 | Energy saving control device and equipment or injection molding machine equipped with this energy saving control device |
| US9556874B2 (en) | 2009-06-09 | 2017-01-31 | Pentair Flow Technologies, Llc | Method of controlling a pump and motor |
| US8564233B2 (en) | 2009-06-09 | 2013-10-22 | Sta-Rite Industries, Llc | Safety system and method for pump and motor |
| DE102010033346B3 (en) * | 2010-08-04 | 2012-02-02 | Bucyrus Hex Gmbh | Method for starting an electric motor in a hydraulically operated machine |
| US9243413B2 (en) | 2010-12-08 | 2016-01-26 | Pentair Water Pool And Spa, Inc. | Discharge vacuum relief valve for safety vacuum release system |
| US9885360B2 (en) | 2012-10-25 | 2018-02-06 | Pentair Flow Technologies, Llc | Battery backup sump pump systems and methods |
| EP2972656A4 (en) | 2013-03-15 | 2017-01-18 | Pentair Flow Technologies, LLC | Method of controlling a pump and motor |
| CN104514777A (en) * | 2013-09-29 | 2015-04-15 | 佛山市恒力泰机械有限公司 | Energy-saving servo control system of ceramic brick pressing machine |
| CN105804964B (en) * | 2016-03-15 | 2018-05-29 | 北京星达科技发展有限公司 | High pressure constant flow pump and flow closed loop control method |
| CN106499614B (en) * | 2016-10-28 | 2017-11-07 | 合肥工业大学 | Hydraulic energy-saving system and control method that variable speed electric motors, particularly is matched with variable displacement with constant power pump |
| CN108071620A (en) * | 2016-11-16 | 2018-05-25 | 丹佛斯动力系统（浙江）有限公司 | Electrically-controlled valve, hydraulic pump and the hydraulic pump system for possessing changeable control function |
| NO343276B1 (en) * | 2016-11-30 | 2019-01-14 | Impact Solutions As | A method of controlling a prime mover and a plant for controlling the delivery of a pressurized fluid in a conduit |
| CN112648134A (en) * | 2020-12-29 | 2021-04-13 | 中国航空工业集团公司西安飞机设计研究所 | Variable displacement hydraulic motor control system |
| CN112901438A (en) * | 2020-12-30 | 2021-06-04 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Electric control type constant power electric pump |
| CN113513507B (en) * | 2021-06-25 | 2023-01-03 | 中航力源液压股份有限公司 | Control device for reducing starting torque of electric pump |
| CN113685397B (en) * | 2021-08-25 | 2023-11-17 | 国网福建省电力有限公司泉州供电公司 | Hydraulic control system applied to 10kV live working platform |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071730A (en) * | 1991-10-10 | 1993-05-05 | 北京市西城区新开通用试验厂 | A kind of numerically controlled energy-saving oil extractor |
| CN1079026A (en) * | 1992-05-21 | 1993-12-01 | 北京市西城区新开通用试验厂 | Digit control hydraulic meter high molecular pump |
| JPH10167089A (en) * | 1996-12-04 | 1998-06-23 | Unisia Jecs Corp | Power steering device |
| CN1237233A (en) * | 1996-09-13 | 1999-12-01 | 维克斯公司 | Electrohydraulic system and apparatus with bidirectional electric-motor hydraulic-pump unit |
| CN1306606A (en) * | 1999-05-28 | 2001-08-01 | 日立建机株式会社 | Pump capacity control device and valve device |
| CN1322668A (en) * | 2001-06-14 | 2001-11-21 | 浙江大学 | Energy-storing power economizer for varying frequency driven hydraulic elevator |
-
2006
- 2006-03-07 CN CNB2006100124743A patent/CN100451336C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071730A (en) * | 1991-10-10 | 1993-05-05 | 北京市西城区新开通用试验厂 | A kind of numerically controlled energy-saving oil extractor |
| CN1079026A (en) * | 1992-05-21 | 1993-12-01 | 北京市西城区新开通用试验厂 | Digit control hydraulic meter high molecular pump |
| CN1237233A (en) * | 1996-09-13 | 1999-12-01 | 维克斯公司 | Electrohydraulic system and apparatus with bidirectional electric-motor hydraulic-pump unit |
| JPH10167089A (en) * | 1996-12-04 | 1998-06-23 | Unisia Jecs Corp | Power steering device |
| CN1306606A (en) * | 1999-05-28 | 2001-08-01 | 日立建机株式会社 | Pump capacity control device and valve device |
| CN1322668A (en) * | 2001-06-14 | 2001-11-21 | 浙江大学 | Energy-storing power economizer for varying frequency driven hydraulic elevator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI730404B (en) * | 2018-09-12 | 2021-06-11 | 日商住友精密工業股份有限公司 | Constant pressure liquid supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1821574A (en) | 2006-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100451336C (en) | Low idling energy consumption hydraulic power source | |
| CN103790874B (en) | Valveless Hydrauservo System and controlling method thereof | |
| CN107630847B (en) | Electric ratio pressure continuously regulates and controls hydraulic motor/pump | |
| CN100424361C (en) | Closed electrohydraulic controlling system | |
| CN101691878B (en) | Hydraulic pump flow regulating device | |
| CN100491748C (en) | Independent control electrohydraulic system of oil inlet and outlet matching with pump valve composite flux | |
| CN100590307C (en) | Power controller and method for hydraulic power system | |
| CN107061415B (en) | A kind of multifunctional solution compression testing device | |
| CN101871477B (en) | Intermediate-pressure control two-position variable axial plunger hydraulic motor | |
| CN101603527B (en) | Emulsion pump testing system | |
| CN201769389U (en) | Hydraulic press | |
| CN104632794A (en) | Electro-hydraulic servo system of direct drive type hydraulic hoist | |
| CN102420552B (en) | Control loop and control method for improving starting and stopping performance of motor | |
| CN105386953A (en) | Digital flow-distribution constant-flow radial plunger pump | |
| CN108412826A (en) | A kind of electric hydrostatic actuator and its control method of two parallel pumps driving | |
| CN208442096U (en) | A kind of electric hydrostatic actuator of two parallel pumps driving | |
| CN204985169U (en) | Energy -conserving comprehensive experimental platform device of hydraulic pressure | |
| CN102030265A (en) | Crane hydraulic system for load sensitive ship | |
| CN105206167A (en) | Multifunctional comprehensive experimental platform device | |
| JP2019020132A (en) | Durability test apparatus of engine | |
| CN109139590A (en) | Become discharge capacity with streaming system based on switching flow and the open type digital pump for compiling strategy | |
| CN104100508A (en) | Use of a motor-driven speed-variable hydraulic pump as a hydrostatic transmission | |
| CN102494128A (en) | Pump-controlled CVT (continuously variable transmission) electric hydraulic control system | |
| CN203114798U (en) | Energy-saving servo hydraulic station | |
| CN100588835C (en) | Double pumps displacement water turbine speed regulating means |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20060823 Assignee: Shanxi Electric Equipment Co., Ltd. Assignor: Taiyuan University of Technology Contract record no.: 2012990000655 Denomination of invention: Low idling energy consumption hydraulic power source Granted publication date: 20090114 License type: Exclusive License Record date: 20120910 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| EM01 | Change of recordation of patent licensing contract |
Change date: 20130322 Contract record no.: 2012990000655 Assignee after: Shanxi Shiwopu Electrical Equipment Co. Ltd. Assignee before: Shanxi Electric Equipment Co., Ltd. |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 Termination date: 20160307 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |