CN2884175Y - Electric cylinder testing platform - Google Patents
Electric cylinder testing platform Download PDFInfo
- Publication number
- CN2884175Y CN2884175Y CNU2005200451977U CN200520045197U CN2884175Y CN 2884175 Y CN2884175 Y CN 2884175Y CN U2005200451977 U CNU2005200451977 U CN U2005200451977U CN 200520045197 U CN200520045197 U CN 200520045197U CN 2884175 Y CN2884175 Y CN 2884175Y
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Abstract
The utility model relates to a push-pull force testing device, in particular to an electric cylinder test bed, which aims to solve the technical problem during an electric cylinder test that dynamic description is impossible for push-pull force in electric cylinder movement process. The utility model adopts the technical proposal that: the device is provided with the electric cylinder test bed; an electric cylinder support and a hydraulic pressure device support with an inclined strut are arranged on both ends of a soleplate; a pin is fixed at the inner side of the electric cylinder support through a pin cross slab; the electric cylinder is sleeve-jointed on the pin; a hydraulic pressure device is fixed on the hydraulic pressure device support; a sensor is connected between the hydraulic pressure device and the electric cylinder; a sensor output terminal is connected with a data processing display unit; the electric cylinder is also connected with an electrical control box. The control loop of the electrical control box comprises a main loop, a relay control loop and an auxiliary loop. The utility model is mainly used for testing a new electric cylinder and a repaired electric cylinder.
Description
Technical field: the utility model relates to device for testing push-pull force, particularly a kind of electronic cylinder testing table.
Background technology: domestic use to electronic cylinder at present still is in the starting stage, of home make electronic cylinder is mainly the model below 5 tons, the electronic cylinder of model mainly relies on import more than 10 tons, and does not form special standard for manufacturing, the factory inspection of electronic cylinder.Repairing test for electronic cylinder, domestic do not have a special testing equipment, existing way is also only judged the push-and-pull masterpiece qualitatively: promptly according to the push-pull effort of tested electronic cylinder, preestablish a nominal load, by mechanical connection or hydraulicdriven method, when electronic cylinder stretchy or when backing down load, assert that just the performance of this electronic cylinder is satisfied the criteria.This test method can't dynamically be described the push-pull effort of electronic cylinder motion process, and the electronic cylinder after the test lacks reliability.
Summary of the invention: the purpose of this utility model provides a kind of can dynamically the description the push-pull effort of electronic cylinder motion process, the electronic cylinder testing table that can detect the electronic cylinder of repairing.By designing electronic cylinder testing table; electronic cylinder after repairing is carried out load test according to its functions of use; whether the load-carrying ability of the electronic cylinder that is repaired with detection reaches the requirement (comprise push-pull effort, maximum output current, overload after protection) of nameplate defined, guarantees repairing quality.
The technical solution of the utility model is: electronic cylinder testing table, be provided with electronic jar support and the hydraulic means support that has diagonal brace at the two ends of base plate, be fixed with pin in electronic jar support inboard by the pin transverse slat, electronic cylinder sleeve is connected on the pin, hydraulic means is fixed on the hydraulic means support, be connected with sensor between hydraulic means and the electronic cylinder, the output terminal of sensor connects data processes and displays device, and electronic cylinder also connects electric control box.Described hydraulic device structure is: oil filter is arranged in the fuel tank, be connected with the hydraulic pump inlet port by oil pipe, the hydraulic pump oil-out connects hydraulic valve block by oil pipe, surplus valve, retaining valve and solenoid-operated proportional precursor overflow valve are installed on the hydraulic valve block, one termination tensimeter of solenoid-operated proportional precursor overflow valve, another termination hydraulic cylinder rod chamber has a joint to connect the hydraulic cylinder rodless cavity at tank surface.The control loop of electric control box is by major loop; Relay-controlled Circuit; subsidiary loop is formed; three loops connect by power lead; wherein main circuit power at first connects three-phase circuit protection FU1 fuse; meet primary power air-break QF1 then; its output termination A.C. contactor GQJ and GHT; controlling electronic cylinder drive motor just changes; counter-rotating; the output terminal of A.C. contactor GQJ connects electronic cylinder drive motor; the middle phase output terminal serial connection current transformer TA of A.C. contactor GQJ; current transformer TA connects digital display alternating current ammeter DLB; the output terminal of primary power air-break QF1 also connects behind the three-phase fuse FU2 and contactor YBC; electrothermal relay KR is connected successively with hydraulic pump drive motor YB; first output terminal of air-break QF1 and middle output terminal relay coil ZDY in parallel; its output terminal is connected on the interface tablet of computing machine, so that whether the computer discriminant main circuit power closes.Relay-controlled Circuit power supply A, C two-phase connection circuit protection FU3 fuse; meet power supply air-break QF2 then; the output terminal of power supply air-break QF2 is parallel with relay coil KDY respectively; its output terminal is connected on the interface tablet of computing machine, so that whether computer discriminant control loop power supply closes.Be connected in parallel on the output terminal of power supply air-break QF2 behind the start button ST1 of hydraulic oil pump, the stop button SP1 of hydraulic oil pump, A.C. contactor YBC and the electrothermal relay KR polyphone, the two ends of the stop button SP1 of hydraulic oil pump are parallel with an A.C. contactor YBC, and the Oil pump electrical machinery of A.C. contactor YBC controlled hydraulic system starts or stops.Passive electronic cylinder stop button SP2, inching button QJ, A.C. contactor GHT, GQJ and electronic cylinder drive motor advance and are connected in parallel on the output terminal of power supply air-break QF2 after spacing XW1J is connected in series successively, electronic cylinder back HT, A.C. contactor GQJ, GHT, spacing and the electronic cylinder drive motor of electronic cylinder drive motor overload retreats spacing polyphone successively, termination after the series connection is gone into passive electronic cylinder stop button SP2, the intermediate point of inching button QJ, the output terminal of another termination power air-break QF2, electronic cylinder retreats switch ZDHT one termination double open switch HZ automatically, the other end inserts electronic cylinder back HT, A.C. contactor GQJ intermediate point, the electronic cylinder switch ZDQJ one termination double open switch HZ that advances automatically, the other end inserts the intermediate point of inching button QJ and A.C. contactor GHT, oil pump run switch ZDYB one termination double open switch HZ, the other end insert the stop button SP1 and the A.C. contactor YBC point in parallel of hydraulic oil pump.Status signal (YBJ, QJJ, HTJ) for various power detection signal (24DYJ, ZDYJ, KDYJ), spacing position detection signal (XW1J, XW2J) and the Be Controlled object of importing computing machine in the subsidiary loop all is the input and output PCLD-8710 plate of isolating input computing machine in back by the low pressure auxiliary reclay of 24V.The various control signals of same computing machine output also are to remove to control the coil of the A.C. contactor of major loop after isolating by 24V low pressure auxiliary reclay again.Main control command signal have system automatically with manual steering order XZ, automatically oil pump operating instruction ZDYB, tested electronic cylinder automatic advancement commands ZDQJ and retreat instruction ZDHT automatically and the pulling force protection overload instruction CZ of system.Subsidiary loop has accessory power supply, accessory power supply meets order phase automatic air circuit breaker QF3 behind the fuse KU4, single-phase automatic air circuit breaker QF3 output terminal is connected with the hydraulic system working pressure signal, tested electronic cylinder load pulling force signal, tested electronic cylinder travel displacement signal, the direct current 24V accessory power supply that the signal transmitting device of the current signal of tested electronic cylinder drive motor uses, the working power that exchanges 21V of direct current 12V stabilized voltage supply and hydraulic system solenoid-operated proportional precursor overflow valve amplifier, and the working power of the large screen display of tested electronic cylinder load force and pulling force measuring instrument.
The beneficial effects of the utility model are: for the test of electronic cylinder provides the means of science, changed and judged the way of repairing effect in the past by rule of thumb, guaranteed repairing quality, stablized the maintenance resource; Simultaneously, reduce and repair link, shortened the repair cycle.
Description of drawings:
Fig. 1 is the utility model shaped as frame structural representation
Fig. 2 is the utility model hydraulic means systematic schematic diagram
Fig. 3 is the utility model hydraulic means front view
Fig. 4 is the utility model hydraulic means vertical view
Fig. 5 is the utility model circuit assembly figure
Among the figure: 1-base plate, 2-hydraulic means, 3-electronic cylinder, 4-1-electronic jar support, 4-2-hydraulic means support, 5-pin transverse slat, 6-pin, 7-sensor, 8-electric control box, 9-data processing display device, 10-fuel tank, 11-oil filter, 12-hydraulic pump, 13-surplus valve, 14-retaining valve, 15-solenoid-operated proportional precursor overflow valve, 16-tensimeter, 17-hydraulic cylinder, 18-hydraulic valve block.
Embodiment: with reference to Fig. 1, electronic cylinder testing table, be provided with electronic jar support 4-1 and the appliance stand 4-2 that has diagonal brace at the two ends of base plate 1, be fixed with pin 6 in electronic jar support inboard by pin transverse slat 5, electronic cylinder 3 is socketed on the pin 6, and hydraulic means 2 is fixed on the hydraulic means support 4-2, is connected with sensor 7 between hydraulic means and the electronic cylinder, the output terminal of sensor connects data processes and displays device 9, and electronic cylinder 3 also connects electric control box 8.With reference to Fig. 2,3,4, described hydraulic means 2 structures are: oil filter 11 is arranged in the fuel tank 10, be connected with hydraulic pump 17 inlet ports by oil pipe, hydraulic pump 17 oil-outs connect hydraulic valve block 18 by oil pipe, surplus valve 13, retaining valve 14 and solenoid-operated proportional precursor overflow valve 15 are installed in the hydraulic valve block 18, one termination tensimeter 16 of solenoid-operated proportional precursor overflow valve 15, another termination hydraulic cylinder 17 rod chambers have a joint to connect hydraulic cylinder 17 rodless cavities on fuel tank 10 surfaces.Utilize hydraulic means 2 to provide load, be synchronized with the movement with tested electronic cylinder simultaneously, after promptly tested electronic cylinder reaches rated load, also can keep load constant, continue to cover stroke for tested electronic cylinder 3.12 rotations of driven by motor hydraulic pump, the pressure oil that pump is got enters the operation valve piece, and regulating surplus valve 13 adjusting handles is the charge oil pressure of scalable pump, and pressure oil enters the hydraulic cylinder rod chamber, makes to load the cylinder backhaul.When tested electronic cylinder pulling hydraulic cylinder piston rod stretches out it, the fluid of hydraulic cylinder rod chamber is by solenoid-operated proportional precursor overflow valve 15 oil sump tanks 10, the input voltage of the proportional amplifier by regulating the solenoid-operated proportional precursor overflow valve, get final product the return oil pressure of regulator solution cylinder pressure rod chamber, thereby for tested electronic cylinder provides constant load, because the emptying of hydraulic cylinder rodless cavity when so just can guarantee that hydraulic cylinder provides required load for tested electronic cylinder, is synchronized with the movement with tested electronic cylinder.The loading hydraulic cylinder of analog loading device has 3, can select different loading hydraulic cylinders to provide fictitious load for it according to the push-pull effort and the speed of tested electronic cylinder.With reference to Fig. 5; power supply enters the electric installing plate X1 of the major loop connecting terminal block of control operation platform; receive three-phase shortcircuit protection FU1 fuse then; deliver to primary power air-break QF1 again, the major loop air-break mainly plays overload protection in order to the disjunction main circuit power with to tested electronic cylinder driving motor.The forward and backward of tested electronic cylinder drive motor is controlled by GQJ and two A.C. contactors of GHT.The short-circuit protection of system liquid press pump drive motor is that the fuse of 15A is realized by the FU2-capacity; its overload protection is to be controlled by the KR electrothermal relay that is serially connected in hydraulic pump drive motor contactor output terminal, and the running of hydraulic pump is controlled by contactor YBC.Middle phase output terminal at tested electronic cylinder drive motor contactor has been connected in series current transformer in order to gather the load current signal of tested electronic cylinder drive motor, delivers to industrial computer by 4～20mA signal of DLB digital display alternating current ammeter outputting standard and carries out automatic overload protection control.Relay-controlled Circuit mainly is the relay control section of major loop A.C. contactor; its power supply draws from the A of inlet wire connection terminal X1, C two-phase power supply; FU3-1, FU3-2 fuse are that the short-circuit protection for control loop is provided with, and the QF2 air-break is the independent power control switch of control loop.The control mode of this test unit is divided automatically and manual two kinds, and the switching of control mode is the picture control by industrial computer.Under the automatic control mode condition; all control knobs are all inoperative; the spacing XWlJ and retreat spacing XW2J protection and still can work but Oil pump electrical machinery overload protection KR that is provided with on the circuit and tested electronic cylinder drive motor advance comprises that the interlocking of tested electronic cylinder drive motor forward and backward can normally play a role too.Except being provided with tested electronic cylinder position limitation protection, also considered in addition the test unit pulling force to be carried out overload protection by XW3J.Under manual control situation, button ST1 is the start button of hydraulic oil pump, and SP1 is the stop button of hydraulic oil pump.QJ is tested electronic cylinder forwarding button, and HT is tested electronic cylinder back, and SP2 is tested electronic cylinder stop button, and QJ, HT button all are inching button, only can control advancing or retreating of tested electronic cylinder when pressing, and the openhanded back of opening stops at once.For system's reliably working, input, output signal to computing machine have been taked corresponding quarantine measures, all are the input and output PCLD-8710 plates of isolating input computing machine in back by the low pressure auxiliary reclay of 24V for the status signal (YBJ, QJJ, HTJ) of various power detection signal (24DYJ, ZDYJ, KDYJ), spacing position detection signal (XW1J, XW2J) and Be Controlled object of input computing machine.The various control signals of same computing machine output also are to remove to control the coil of the A.C. contactor of major loop after isolating by 24V low pressure auxiliary reclay again.Main control command signal have system automatically with manual steering order XZ, automatically oil pump operating instruction ZDYB, tested electronic cylinder automatic advancement commands ZDQJ and retreat instruction ZDHT automatically and the pulling force protection overload instruction CZ of system.Therefore be provided with corresponding subsidiary loop specially.In addition, the electric automatic system of test unit has been gathered the current signal of hydraulic system working pressure signal, tested electronic cylinder load pulling force signal, tested electronic cylinder travel displacement signal, tested electronic cylinder drive motor, the transmitter of these signals has used some direct current 24V accessory power supplys, direct current 12V stabilized voltage supply and hydraulic system solenoid-operated proportional precursor overflow valve amplifier exchange the 21V working power, and the control of the working power of the large screen display of tested electronic cylinder load force and pulling force measuring instrument all belongs to the subsidiary loop of electric control system.For the facility of system overhaul and debugging, subsidiary loop is provided with the power supply control master switch of single-phase automatic air circuit breaker QF3 as alternating current 220V specially.Major loop, relay control circuit and subsidiary loop are connected by power lead.
The utility model also can be applied to the value of thrust of like device and thrust magnitude, and (scope only need be done corresponding the improvement and get final product in 0.5～100t) test as hydraulic cylinder, pneumatic linear actuator, wire rope during application.
Claims (6)
1, electronic cylinder testing table, it is characterized in that: be provided with the electronic jar support and the hydraulic means support that have diagonal brace at the two ends of base plate, be fixed with pin in electronic jar support inboard by the pin transverse slat, electronic cylinder sleeve is connected on the pin, hydraulic means is fixed on the hydraulic means support, be connected with sensor between hydraulic means and the electronic cylinder, the output terminal of sensor connects data processes and displays device, and electronic cylinder also connects electric control box.
2, electronic cylinder testing table according to claim 1, it is characterized in that, described hydraulic device structure is: oil filter is arranged in the fuel tank, be connected with the hydraulic pump inlet port by oil pipe, the hydraulic pump oil-out connects hydraulic valve block by oil pipe, and surplus valve, retaining valve and solenoid-operated proportional precursor overflow valve are installed on the hydraulic valve block, a termination tensimeter of solenoid-operated proportional precursor overflow valve, another termination hydraulic cylinder rod chamber has a joint to connect the hydraulic cylinder rodless cavity at tank surface.
3, electronic cylinder testing table according to claim 1 is characterized in that the control loop of electric control box is made up of major loop, Relay-controlled Circuit, subsidiary loop, and major loop, relay control circuit and subsidiary loop are connected by power lead.
4; electronic cylinder testing table according to claim 3; it is characterized in that; main circuit power at first connects three-phase circuit protection FU1 fuse; meet primary power air-break QF1 then; its output termination A.C. contactor GQJ and GHT; controlling electronic cylinder drive motor just changes; counter-rotating; the output terminal of A.C. contactor GQJ connects electronic cylinder drive motor; the middle phase output terminal serial connection current transformer TA of A.C. contactor GQJ; current transformer TA connects digital display alternating current ammeter DLB; the output terminal of primary power air-break QF1 also connects behind the three-phase fuse FU2 and contactor YBC; electrothermal relay KR is connected successively with hydraulic pump drive motor YB, first output terminal of air-break QF1 and middle output terminal relay coil ZDY in parallel.
5; electronic cylinder testing table according to claim 3; it is characterized in that; Relay-controlled Circuit power supply A; C two-phase connection circuit protection FU3 fuse; meet power supply air-break QF2 then; the output terminal of power supply air-break QF2 is parallel with relay coil KDY respectively; the start button ST1 of hydraulic oil pump; the stop button SP1 of hydraulic oil pump; be connected in parallel on the output terminal of power supply air-break QF2 behind A.C. contactor YBC and the electrothermal relay KR polyphone; the two ends of the stop button SP1 of hydraulic oil pump are parallel with an A.C. contactor YBC; the Oil pump electrical machinery of A.C. contactor YBC controlled hydraulic system starts or stops; passive electronic cylinder stop button SP2; inching button QJ; A.C. contactor GHT; GQJ and electronic cylinder drive motor advance and are connected in parallel on the output terminal of power supply air-break QF2 after spacing XW1J is connected in series successively; electronic cylinder back HT; A.C. contactor GQJ; GHT; spacing and the electronic cylinder drive motor of electronic cylinder drive motor overload retreats spacing polyphone successively; termination after the series connection is gone into passive electronic cylinder stop button SP2; the intermediate point of inching button QJ; the output terminal of another termination power air-break QF2; electronic cylinder retreats switch ZDHT one termination double open switch HZ automatically; the other end inserts electronic cylinder back HT; A.C. contactor GQJ intermediate point; the electronic cylinder switch ZDQJ one termination double open switch HZ that advances automatically; the other end inserts the intermediate point of inching button QJ and A.C. contactor GHT; oil pump run switch ZDYB one termination double open switch HZ, the other end insert the stop button SP1 and the A.C. contactor YBC point in parallel of hydraulic oil pump.
6, electronic cylinder testing table according to claim 3, it is characterized in that, subsidiary loop has accessory power supply, accessory power supply meets order phase automatic air circuit breaker QF3 behind the fuse KU4, single-phase automatic air circuit breaker QF3 output terminal is connected with the hydraulic system working pressure signal, tested electronic cylinder load pulling force signal, tested electronic cylinder travel displacement signal, the direct current 24V accessory power supply that the signal transmitting device of the current signal of tested electronic cylinder drive motor uses, direct current 12V stabilized voltage supply and hydraulic system solenoid-operated proportional precursor overflow valve amplifier exchange the 21V working power and the working power of the large screen display of tested electronic cylinder load force and pulling force measuring instrument; In the subsidiary loop for the input computing machine various power detection signal 24DYJ; ZDYJ; KDYJ; spacing position detection signal XW1J; the status signal YBJ of XW2J and Be Controlled object; QJJ; HTJ is the input and output PCLD-8710 plate of isolating input computing machine in back by the low pressure auxiliary reclay of 24V; the various control signals of same computing machine output also are to remove to control the coil of the A.C. contactor of major loop after isolating by 24V low pressure auxiliary reclay again, main control command signal have system automatically with manual steering order XZ; automatic oil pump operating instruction ZDYB; the automatic advancement commands ZDQJ of tested electronic cylinder and retreat automatically the instruction ZDHT; and the pulling force protection overload instruction CZ of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200451977U CN2884175Y (en) | 2005-09-22 | 2005-09-22 | Electric cylinder testing platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200451977U CN2884175Y (en) | 2005-09-22 | 2005-09-22 | Electric cylinder testing platform |
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| CN2884175Y true CN2884175Y (en) | 2007-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2005200451977U Expired - Fee Related CN2884175Y (en) | 2005-09-22 | 2005-09-22 | Electric cylinder testing platform |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660975B (en) * | 2008-08-28 | 2011-08-31 | 上海宝钢设备检修有限公司 | System for testing fine cooling jet valve of rolling mill |
| CN103334984A (en) * | 2013-07-09 | 2013-10-02 | 中联重科股份有限公司 | Device for adjusting length of oil cylinder |
| CN103424655A (en) * | 2013-08-07 | 2013-12-04 | 中国航天科技集团公司第九研究院第七七一研究所 | Electric cylinder tension load and life test device |
| CN103499454A (en) * | 2013-09-03 | 2014-01-08 | 北京摩诘创新科技股份有限公司 | Device for testing performance of electric cylinder |
| CN103913345A (en) * | 2014-04-02 | 2014-07-09 | 南京威宁锐克信息技术有限公司 | Detection device of electric cylinder |
| CN105352645A (en) * | 2015-12-14 | 2016-02-24 | 重庆东登科技有限公司 | Electric cylinder push-pull force limit testing mechanism |
| CN105928692A (en) * | 2016-04-22 | 2016-09-07 | 南京晨光集团有限责任公司 | Servo mechanism actuator boosting mechanism and boosting method |
| CN106323665A (en) * | 2016-10-11 | 2017-01-11 | 南京航空航天大学 | Electric cylinder performance testing system |
| CN108254204A (en) * | 2016-12-28 | 2018-07-06 | 中国科学院长春光学精密机械与物理研究所 | A kind of electric cylinder real-timely testing performance system of dynamically changeable load |
| CN110364989A (en) * | 2019-06-26 | 2019-10-22 | 中国飞机强度研究所 | A kind of double control safety protective circuit |
-
2005
- 2005-09-22 CN CNU2005200451977U patent/CN2884175Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660975B (en) * | 2008-08-28 | 2011-08-31 | 上海宝钢设备检修有限公司 | System for testing fine cooling jet valve of rolling mill |
| CN103334984A (en) * | 2013-07-09 | 2013-10-02 | 中联重科股份有限公司 | Device for adjusting length of oil cylinder |
| CN103334984B (en) * | 2013-07-09 | 2016-01-13 | 中联重科股份有限公司 | Device for adjusting length of oil cylinder |
| CN103424655B (en) * | 2013-08-07 | 2015-08-12 | 中国航天科技集团公司第九研究院第七七一研究所 | A kind of electric cylinder tension load and life test apparatus |
| CN103424655A (en) * | 2013-08-07 | 2013-12-04 | 中国航天科技集团公司第九研究院第七七一研究所 | Electric cylinder tension load and life test device |
| CN103499454A (en) * | 2013-09-03 | 2014-01-08 | 北京摩诘创新科技股份有限公司 | Device for testing performance of electric cylinder |
| CN103499454B (en) * | 2013-09-03 | 2016-02-24 | 北京摩诘创新科技股份有限公司 | Electric cylinder performance testing device |
| CN103913345A (en) * | 2014-04-02 | 2014-07-09 | 南京威宁锐克信息技术有限公司 | Detection device of electric cylinder |
| CN105352645A (en) * | 2015-12-14 | 2016-02-24 | 重庆东登科技有限公司 | Electric cylinder push-pull force limit testing mechanism |
| CN105928692A (en) * | 2016-04-22 | 2016-09-07 | 南京晨光集团有限责任公司 | Servo mechanism actuator boosting mechanism and boosting method |
| CN106323665A (en) * | 2016-10-11 | 2017-01-11 | 南京航空航天大学 | Electric cylinder performance testing system |
| CN108254204A (en) * | 2016-12-28 | 2018-07-06 | 中国科学院长春光学精密机械与物理研究所 | A kind of electric cylinder real-timely testing performance system of dynamically changeable load |
| CN110364989A (en) * | 2019-06-26 | 2019-10-22 | 中国飞机强度研究所 | A kind of double control safety protective circuit |
| CN110364989B (en) * | 2019-06-26 | 2021-09-03 | 中国飞机强度研究所 | Dual-control safety protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070328 Termination date: 20100922 |