CN101995319B - Airtightness testing machine - Google Patents
Airtightness testing machine Download PDFInfo
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- CN101995319B CN101995319B CN2010105295862A CN201010529586A CN101995319B CN 101995319 B CN101995319 B CN 101995319B CN 2010105295862 A CN2010105295862 A CN 2010105295862A CN 201010529586 A CN201010529586 A CN 201010529586A CN 101995319 B CN101995319 B CN 101995319B
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- airtight
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- 238000012360 testing method Methods 0.000 title claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000011148 porous material Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 39
- 239000003921 oil Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000006424 Flood reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The invention discloses an airtightness testing machine comprising an airtight box body, a water drum arranged in the airtight box body, a first branch tube, a second branch tube, a water inlet electromagnetic valve, a drain electromagnetic valve, an exhaust electromagnetic valve and a controller, wherein a testing box body is arranged on the top of the airtight box body; a testing table is arranged at the bottom of the testing box body; an air hole provided with a tube joint is arranged in the middle of the testing table; the tube joint is connected with a second pneumatic electromagnetic valve through an air duct; the testing table is provided with a hydraulic cylinder and an air cylinder, and an oil inlet tube of the hydraulic cylinder and the air inlet pipeline of the air cylinder are respectively provided with a hydraulic electromagnetic valve and a first pneumatic electromagnetic valve; the first branch tube is provided with a first pneumatic electromagnetic valve and is connected with the air cylinder; the second branch tube is provided with a third pneumatic electromagnetic valve and is communicated with the airtight box body; and the controller controls the opening and closing of the hydraulic electromagnetic valve, the first pneumatic electromagnetic valves, the second pneumatic electromagnetic valve, the third pneumatic electromagnetic valve, the exhaust electromagnetic valve, the water inlet electromagnetic valve and the drain electromagnetic valve. The invention can effectively eliminate instability and decrease false test probability.
Description
Technical field
The present invention relates to proving installation, particularly relate to a kind of airtight test machine.
Background technology
Because inflammable, the explosive characteristic of gasoline, diesel oil for this type of machinery of fuel engines, for improving safety coefficient, must be carried out strict check to the sealing of total system.And engine cylinder cover is as the shell of engine, and fuel oil is with the barrier at last of air contact, and sealing is the most important thing especially.
Traditional airtight test machine is directly through pressing the fixed engine cylinder cover to be measured of clamping; Stop up whole inner chambers of cylinder cap and the outside hole that is connected, cylinder cap has formed the inner chamber of a sealing like this, then cylinder cap is immersed in the water; Gas after the air compressor compression gets in the cylinder cap through the built-in air hole of frock plate; Realize the internal pressurization of cylinder cap, form pressure reduction by internal air pressure and external water pressure, and whether cylinder cap produces the sealing that bubble is concluded this cylinder cap in operator's observation water.
But it is more to use traditional airtight test machine uncontrollable factor, and like the pressure of input, press the dynamics of folder etc., and the operator makes like this that as the judgement side of whole detection the stability of testing is not high, and the probability of flase drop is higher.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of airtight test machine, and is not high with the stability that solves traditional airtight test machine, the probability of false detection problem of higher, and technical scheme is following:
Said airtight test machine comprises: airtight casing, and its top is provided with the test casing, and the bottom of this test casing is provided with test board, has the pore that pipe adapter is installed in the middle of this test board, and said pipe adapter links to each other with second air-operated solenoid valve through wireway; This test board is provided with hydraulic cylinder and cylinder, and is respectively arranged with the hydraulic buttery valve and first air-operated solenoid valve on the air supply pipe of the oil inlet pipe of this hydraulic cylinder and cylinder;
Be arranged on airtight box house, the water drum that the two ends that airtight casing is communicated with the test casing are not all sealed;
Air supply pipe comprises first arm that is provided with first air-operated solenoid valve and is connected with cylinder and second arm that is provided with the 3rd air-operated solenoid valve and is communicated with said airtight casing;
Be separately positioned on the entering water electromagnetic valve and the drain solenoid valve of said airtight bottom half water inlet and freeing port;
Be arranged on the exhaust solenoid valve of said airtight casing exhausr port;
The electronic digital display table, this electronic digital display table links to each other with gas pressure sensor, to show gas pressure value;
Controller is used to control the switch of said hydraulic buttery valve, first air-operated solenoid valve, second air-operated solenoid valve, the 3rd air-operated solenoid valve, exhaust solenoid valve, entering water electromagnetic valve and drain solenoid valve.
Wherein, said gas pressure sensor links to each other with controller through the induced electricity magnet valve.
Wherein, also comprise: be arranged at the rubber cushion that has pore on the test board, the pore that exists on the pore on this rubber cushion and the test board communicates.
Wherein, said cylinder and hydraulic cylinder quantity are at least two.
Wherein, also comprise: separator;
Said separator links to each other with the oil inlet pipe of hydraulic cylinder.
Wherein, also comprise: the air pressure regulator that links to each other with air supply pipe.
Wherein, also comprise: the emergency stop switch that links to each other with first arm.
Wherein, also comprise: the counter that links to each other with controller is used for statistical magnitude.
Technical scheme by the above embodiment of the invention provides is visible; Airtight test machine of the present invention adopts controller to control whole test process; And under certain predetermined condition, carry out, eliminate the instability that manually-operated brings with this, reduce the probability of flase drop.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously; The accompanying drawing that describes below only is some embodiment that put down in writing among the present invention, for those of ordinary skills, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the front elevational view of embodiment of the invention airtight test machine;
Fig. 2 for embodiment of the invention airtight test machine after cut open figure;
Fig. 3 is the vertical view of embodiment of the invention airtight test machine;
Fig. 4 is the left view of embodiment of the invention airtight test machine.
Embodiment
In order to make those skilled in the art person understand the technical scheme among the present invention better; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained should belong to the scope that the present invention protects.
The purpose of this invention is to provide a kind of airtight test machine, can solve in traditional airtight test machine test because the problem that the instability that manually-operated brings is high, probability of false detection is high.
The described airtight test machine of the embodiment of the invention comprises:
Airtight casing, its top is provided with the test casing, and the bottom of this test casing is provided with test board, has the pore that pipe adapter is installed in the middle of this test board, and said pipe adapter links to each other with second air-operated solenoid valve through wireway; This test board is provided with hydraulic cylinder and cylinder, and is respectively arranged with the hydraulic buttery valve and first air-operated solenoid valve on the air supply pipe of the oil inlet pipe of this hydraulic cylinder and cylinder; Be arranged on airtight box house, the water drum that the two ends that airtight casing is communicated with the test casing are not all sealed;
Air supply pipe comprises first arm that is provided with first air-operated solenoid valve and is connected with cylinder and second arm that is provided with the 3rd air-operated solenoid valve and is communicated with said airtight casing;
Be separately positioned on the entering water electromagnetic valve and the drain solenoid valve of said airtight bottom half water inlet and freeing port;
Be arranged on the exhaust solenoid valve of said airtight casing exhausr port;
The electronic digital display table, this electronic digital display table links to each other with gas pressure sensor, to show gas pressure value;
Controller is used to control the switch of said hydraulic buttery valve, first air-operated solenoid valve, second air-operated solenoid valve, the 3rd air-operated solenoid valve, exhaust solenoid valve, entering water electromagnetic valve and drain solenoid valve.
The course of work of said airtight test machine is:
(1) location workpiece
Workpiece is placed on the predeterminated position on the test board, makes workpiece be positioned on the test board.
(2) hydraulic cylinder compresses action to workpiece
Controller sends signal to hydraulic buttery valve, and hydraulic buttery valve receives that producing electromagnetic force behind the signal opens oil inlet passage, and fluid gets into hydraulic cylinder, hydraulic cylinder Work-sheet pressing on test board.
(3) cylinder plug-hole
Controller sends signal to first air-operated solenoid valve that is connected in first arm, and the generation electromagnetic force was opened first tube passage after first air-operated solenoid valve was received signal, and gas gets into cylinder, and cylinder carries out plug-hole to workpiece.
(4) to workpiece lumen inflation body
Controller second air-operated solenoid valve sends signal, and the generation electromagnetic force was opened gas circuit after second air-operated solenoid valve was received signal, and gas gets into the measured workpiece inner chamber through the wireway that is connected in second air-operated solenoid valve.Said wireway one end connects second air-operated solenoid valve, other end connecting pipe joint.
(5) whether test leaks gas
After the inflated, behind the voltage stabilizing certain hour, controller transmits signal to gas pressure sensor; The variation of gas pressure sensor perception workpiece lumen air pressure, atmospheric pressure value is presented on the electronic digital display table, as if the atmospheric pressure value maintenance or greater than the atmospheric pressure value requirement; Then workpiece is qualified, does examination and finishes exhaust solenoid valve work; Get rid of workpiece lumen gas, take out workpiece; If be lower than the air pressure required value, then carry out the water examination, water examination process: entering water electromagnetic valve receives that the signal of controller starts working; The water level of airtight casing begins to rise, rise to certain position after, controller sends signal to the 3rd air-operated solenoid valve; The generation electromagnetic force was opened second tube passage after the 3rd air-operated solenoid valve received signal; Feed gas to airtight casing, said gas will be tested water and be pressed in the water drum, and the water level in the water drum rises to and floods till the workpiece; Entering water electromagnetic valve is closed intake tunnel automatically, and the 3rd air-operated solenoid valve quits work; Second air-operated solenoid valve is received signal then, and gas circuit is opened, continue to carry out the inflation of a period of time to workpiece lumen, and which the position gas leakage of artificial observation workpiece, after observation finishes, drain solenoid valve and exhaust solenoid valve work, workpiece is taken out in the sluicing exhaust.
Can know that by above technical scheme of the present invention described airtight test machine adopts controller to control whole test process, and under certain predetermined condition, carry out, eliminate the instability that manually-operated brings, reduce the probability of flase drop with this.
Wherein, gas pressure sensor links to each other with controller; Controller transmits signal and gives the induced electricity magnet valve, and the induced electricity magnet valve sends signal to gas pressure sensor, and gas pressure sensor is presented at the value of air pressure on the electronic digital display table.
Obviously, workpiece directly is pressed on the test board probably the bottom abrasion to workpiece, so a rubber cushion that has pore is set on test board.The pore of rubber cushion communicates with the pore of test board, makes gas to get into workpiece lumen through test board and rubber cushion smoothly.
In order to realize better pressuring action, make workpiece stressed evenly, can on test board, settle a plurality of hydraulic cylinders uniformly; At this moment, need separator that oil circuit is divided into many, make fluid get into a plurality of hydraulic cylinders, to realize to Work-sheet pressing.Obviously, the quantity of cylinder also can be for a plurality of, and a plurality of pores of workpiece are stopped up.
For the embodiment of the invention is optimized more, the described airtight test machine of the embodiment of the invention also comprises: the air pressure regulator that links to each other with air supply pipe, this air pressure regulator are used for regulating the input gaseous tension; With the emergency stop switch that first arm links to each other, this emergency stop switch can run into the workpiece putting position incorrect, promptly stop when causing some emergency case such as human accident, increase the security of workpiece test; Counter, this counter replaces artificial counting adding up or the person that needs the statistical operation when detecting the quantity of workpiece every day the finished product workpiece, writes down workpiece quantity in real time accurately.
In order to make those skilled in the art person understand the present invention program better, below with the controller for the PLC controller is that example combines accompanying drawing and embodiment that the present invention is done further detailed description, certain controller of the present invention is not limited to the PLC controller.
In conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, airtight test machine of the present invention comprises: test casing 1, airtight casing 2, air supply pipe 6 (air supply pipe 6 comprises first arm 61 and second arm 62), cylinder 7, the 3rd air-operated solenoid valve 8, emergency stop switch 9, air pressure regulator 10, rubber cushion 11, test board 12, pipe adapter 13, hydraulic cylinder 14, depression bar 15, briquetting 16, separator 17, register pin 18, water drum 19, rain glass 20, electronic digital display table 21, counter 22, workpiece 23, PLC controller 24, gas pressure sensor 25, intake tunnel 26, the first air-operated solenoid valve (not shown), the second air-operated solenoid valve (not shown), induced electricity magnet valve (not shown), wireway (not shown).
The annexation of each parts is described in the above-described embodiments, do not given unnecessary details at this, the course of work of introducing airtight test machine of the present invention below in conjunction with accompanying drawing in detail is following:
(1) location workpiece
Operating personnel aim at pre-packed register pin 18 on the test platform with the pilot hole of workpiece 23, and said register pin 18 can better be positioned at workpiece 23 on the test board 12, realize the location to workpiece 23.
(2) 14 pairs of workpiece 23 of hydraulic cylinder compress action
(3) cylinder compound rubber plug (not marking among the figure) is realized the plug-hole effect
Open air compressor 3, gases at high pressure pass through to get into air supply pipes 6 behind the air pressure energy storage canister 4, cooperate rain glasss 20 to regulate the pressure of the gases at high pressure of importing at air pressure regulator 10, and the force value of the gases at high pressure of feasible input reaches the value that is provided with in advance.PLC controller 24 provides signal for the first air-operated solenoid valve (not shown), and the generation electromagnetic force was opened gas circuit after first air-operated solenoid valve obtained signal; Under the effect of first air-operated solenoid valve, gas gets into first arm 61, in cylinder 7, inflates, and under the cooperation of rubber plug (not marking among the figure), stops up the hole on the workpiece 23, realizes the plug-hole action of 7 pairs of workpiece 23 of cylinder.
(4) gas gets into the internal cavities of workpiece 23
(5) whether the voltage stabilizing test leaks gas
1) if electronic digital display table 21 shows that inner chamber air pressure keeps or greater than the atmospheric pressure value 0.2Mpa that requires, then workpiece 23 is qualified, does examination and accomplish; PLC controller 24 sends exhaust signal supply and exhaust solenoid valve (not shown), and exhaust solenoid valve is received signal, and the exhaust passage (not shown) is opened, and discharges gas, takes out workpiece 23, and test finishes, and the numerical value of counter 22 increases, the real-time statistics detection limit.
2) after 10 seconds, be lower than the atmospheric pressure value of requirement, then workpiece 23 carried out the water examination if electronic digital display table 21 shows inner chamber air pressure; Water examination process: the entering water electromagnetic valve (not shown) receives that the signal of PLC controller 24 starts working; Make water get into airtight casing from intake tunnel 26, when airtight casing 2 middle water levels rose to a certain degree (can flood workpiece 23 after water gets into water drum 19 as long as can guarantee), PLC controller 24 sent signal to the 3rd air-operated solenoid valve 8; The generation electromagnetic force was opened gas circuit after the 3rd air-operated solenoid valve 8 was received signal; Gas gets into airtight casing 2 from second arm 62, and said gas is gone into the hydraulic pressure in the airtight casing 2 in the water drum 19, till water entering test casing 1 floods workpiece 23; Entering water electromagnetic valve stops automatically, and the 3rd air-operated solenoid valve quits work; Then PLC controller 24 sends signal to second air-operated solenoid valve, and workpiece 23 inner chambers were inflated for 4 seconds, stops inflation after 4 seconds automatically; Carrying out manual observation workpiece 23 which position then has gas leakage, observes after 10 seconds the energising of drain solenoid valve (not shown) picked up signal; Drain solenoid valve work is carried out draining, decline of water table; Exhaust solenoid valve is started working, and gets rid of inner chamber gas, takes out workpiece 23.
Test process finishes, and the numerical value of counter 22 increases, the real-time statistics detection limit.
Can know that by above technical scheme of the present invention described airtight test machine adopts the PLC controller to control whole test process, and under certain predetermined condition, carry out, eliminate the instability that manually-operated brings, reduce the probability of flase drop with this; In addition owing to the Direct Water examination causes damage to workpiece easily; Cause unnecessary worker useless, and waste water resource, adopt airtight test machine of the present invention at first to do examination; Under the underproof situation of dried examination, carry out the water examination, effectively reduced like this because the problem that the Direct Water examination causes.
The above only is an embodiment of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (8)
1. an airtight test machine is characterized in that, comprising:
Airtight casing, its top is provided with the test casing, and the bottom of this test casing is provided with test board, has the pore that pipe adapter is installed in the middle of this test board, and said pipe adapter links to each other with second air-operated solenoid valve through wireway; This test board is provided with hydraulic cylinder and cylinder, and is respectively arranged with the hydraulic buttery valve and first air-operated solenoid valve on the air supply pipe of the oil inlet pipe of this hydraulic cylinder and cylinder;
Be arranged on airtight box house, the water drum that the two ends that airtight casing is communicated with the test casing are not all sealed;
Air supply pipe comprises first arm that is provided with first air-operated solenoid valve and is connected with cylinder and second arm that is provided with the 3rd air-operated solenoid valve and is communicated with said airtight casing;
Be separately positioned on the entering water electromagnetic valve and the drain solenoid valve of said airtight bottom half water inlet and freeing port;
Be arranged on the exhaust solenoid valve of said airtight casing exhausr port;
The electronic digital display table, this electronic digital display table links to each other with gas pressure sensor, to show gas pressure value;
Controller is used to control the switch of said hydraulic buttery valve, first air-operated solenoid valve, second air-operated solenoid valve, the 3rd air-operated solenoid valve, exhaust solenoid valve, entering water electromagnetic valve and drain solenoid valve.
2. airtight test machine according to claim 1 is characterized in that, said gas pressure sensor links to each other with controller through the induced electricity magnet valve.
3. airtight test machine according to claim 1 is characterized in that, also comprises: be arranged at the rubber cushion that has pore on the test board, the pore that exists on the pore on this rubber cushion and the test board communicates.
4. airtight test machine according to claim 1 is characterized in that, at least two of said cylinder and hydraulic cylinder quantity.
5. airtight test machine according to claim 4 is characterized in that, also comprises: separator;
Said separator links to each other with the oil inlet pipe of hydraulic cylinder.
6. airtight test machine according to claim 1 is characterized in that, also comprises: the air pressure regulator that links to each other with air supply pipe.
7. airtight test machine according to claim 1 is characterized in that, also comprises: the emergency stop switch that links to each other with first arm.
8. airtight test machine according to claim 1 is characterized in that, also comprises: the counter that links to each other with controller is used for statistical magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105295862A CN101995319B (en) | 2010-10-22 | 2010-10-22 | Airtightness testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105295862A CN101995319B (en) | 2010-10-22 | 2010-10-22 | Airtightness testing machine |
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| Publication Number | Publication Date |
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| CN101995319A CN101995319A (en) | 2011-03-30 |
| CN101995319B true CN101995319B (en) | 2012-05-30 |
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| CN2010105295862A Expired - Fee Related CN101995319B (en) | 2010-10-22 | 2010-10-22 | Airtightness testing machine |
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| CN102998065A (en) * | 2012-12-18 | 2013-03-27 | 重庆百吉四兴压铸有限公司 | General air tightness detection device |
| CN103084340B (en) * | 2013-01-14 | 2015-11-18 | 湖州剑力金属制品有限公司 | A kind of air tightness test sorting plant automatically |
| CN103196639B (en) * | 2013-04-26 | 2015-11-25 | 南通市华冠电器有限公司 | Membrane leak detector |
| CN104655369A (en) * | 2013-08-12 | 2015-05-27 | 芜湖永裕汽车工业有限公司 | Air tightness detection method of engine cylinder head air passage |
| CN105258867A (en) * | 2015-09-22 | 2016-01-20 | 航天科工防御技术研究试验中心 | Gas tightness detection system |
| CN105424369B (en) * | 2015-12-15 | 2019-01-25 | 中国燃气涡轮研究院 | A kind of aero-engine aerodynamic model exerciser |
| CN106482915B (en) * | 2016-12-15 | 2019-02-26 | 四川红光汽车机电有限公司 | A kind of air inlet relief valve attachment assembly leakage flow automatic checkout equipment |
| CN107063590A (en) * | 2017-01-10 | 2017-08-18 | 广西防城港核电有限公司 | Plate type heat exchanger suppresses test device and suppresses method of testing |
| CN107238469B (en) * | 2017-06-15 | 2019-04-12 | 亚杰科技（江苏）有限公司 | A kind of engine cylinder body infiltration experiment device |
| CN108956048A (en) * | 2018-08-01 | 2018-12-07 | 杜宗英 | Arch-Breaking Device case weld leakproofness automatic detection system |
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|---|---|---|---|---|
| CN2101865U (en) * | 1991-08-15 | 1992-04-15 | 黄永强 | Display for air leakage |
| CN1241717A (en) * | 1999-05-10 | 2000-01-19 | 唐山爱信齿轮有限责任公司 | Dry hermetization testing method and device |
| CN1598517A (en) * | 2004-08-18 | 2005-03-23 | 重庆力帆实业（集团）有限公司 | Engine cylinder end airtight, precision detector |
| CN1746647A (en) * | 2004-09-09 | 2006-03-15 | 扬动股份有限公司 | Method for testing air tightness of cylinder body and cylinder cover of diesel engine |
| CN201397220Y (en) * | 2009-05-06 | 2010-02-03 | 浙江华尔达汽车空调有限公司 | Water tank dry type leak detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050026247A (en) * | 2003-09-09 | 2005-03-15 | 김양구 | Method and device for the water-proofing test |
-
2010
- 2010-10-22 CN CN2010105295862A patent/CN101995319B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101865U (en) * | 1991-08-15 | 1992-04-15 | 黄永强 | Display for air leakage |
| CN1241717A (en) * | 1999-05-10 | 2000-01-19 | 唐山爱信齿轮有限责任公司 | Dry hermetization testing method and device |
| CN1598517A (en) * | 2004-08-18 | 2005-03-23 | 重庆力帆实业（集团）有限公司 | Engine cylinder end airtight, precision detector |
| CN1746647A (en) * | 2004-09-09 | 2006-03-15 | 扬动股份有限公司 | Method for testing air tightness of cylinder body and cylinder cover of diesel engine |
| CN201397220Y (en) * | 2009-05-06 | 2010-02-03 | 浙江华尔达汽车空调有限公司 | Water tank dry type leak detection device |
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| CN101995319A (en) | 2011-03-30 |
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Owner name: SICHUAN YONGGANG MACHINERY CO., LTD. Free format text: FORMER OWNER: LIANG GANG Effective date: 20140702 |
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Effective date of registration: 20140702 Address after: The two South Industrial Park Economic Development Zone 638500 Guang'an city of Sichuan province Linshui County Patentee after: Sichuan Yonggang Machinery Co., Ltd. Address before: 400035 No. 237 cave Road, Geleshan Town, Shapingba District, Chongqing Patentee before: Liang Gang |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20191022 |
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| CF01 | Termination of patent right due to non-payment of annual fee |