CN102169042B - Screw type filter leakage-detecting machine - Google Patents
Screw type filter leakage-detecting machine Download PDFInfo
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- CN102169042B CN102169042B CN2010101147240A CN201010114724A CN102169042B CN 102169042 B CN102169042 B CN 102169042B CN 2010101147240 A CN2010101147240 A CN 2010101147240A CN 201010114724 A CN201010114724 A CN 201010114724A CN 102169042 B CN102169042 B CN 102169042B
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- belt
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- solenoid valve
- screw rod
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- 238000012360 testing method Methods 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000007246 mechanism Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 51
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004949 mass spectrometry Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Abstract
The invention relates to a screw type filter leakage-detecting machine, which comprises a compacting part, an inferior-quality product rejecting part, a display part, a belt transmission part, a screw, air leakage detecting mechanisms, an A/D (analog to digital) conversion module, a PLC (programmable logic controller) industrial computer and a test platform, wherein the compacting part comprises a cylinder pressing head and a servo motor for driving the cylinder pressing head; the inferior-quality product rejecting part comprises a rejecting cylinder, a rejecting top block, a solenoid valve for controlling the rejecting cylinder, and a photoelectric sensor; the display part comprises a pressure gage and a touch display screen; the belt transmission part comprises a fed material conveyor belt, a discharged material conveyor belt and a motor for driving the conveyor belts, wherein the fed material conveyor belt and the discharged material conveyor belt are connected with a belt; a screw is arranged at one side of the test platform; the air leakage detecting mechanisms are arranged in a machine shell under the test platform; and multiple sets of air leakage detecting mechanisms are in one-to-one correspondence with test platform stations on the test platform. The screw type filter leakage-detecting machine provided by the invention is a full-automatic filter detection device, which is used for detecting by utilizing the differential pressure principle. Compared with the original device, the screw type filter leakage-detecting machine has the advantages of the increased detection efficiency and accuracy.
Description
Technical field
The present invention relates to a kind of filter cleaner gas leakage checkout equipment, the filter cleaner checkout equipment that particularly a kind of automaticity is higher.
Background technology
Traditional filter cleaner detection method comprises helium mass spectroscopy, static pressure method, U type Guan Fa etc.Whether the testing process of helium mass spectroscopy charges into helium for filter cleaner is placed in the closed container to tested filter cleaner, have helium to leak through sensor then and judge whether measured piece is qualified; Its principle of static pressure method is whether the filter cleaner inside after the Direct observation inflation exists pressure to change; U type pipe method is that the liquid level difference at contrast U type pipe two ends is judged with certified products and the measured piece U type pipe two ends of packing into.
Summary of the invention
Technical matters
Traditional filter cleaner detection method all needs personnel's post, and the loading and unloading of filter cleaner, the rejecting of substandard products all need manual carrying out, and single is long detection time, and consistance is poor, and the quality of test product can not get guaranteeing that detection efficiency is low, is inappropriate for batch detection.
Technical scheme
For solving the problems of the technologies described above, technical scheme proposed by the invention is following:
The said screw filter cleaner machine that leaks hunting; Comprise pressing section, bad part eject part, display part, belt hop, A/D modular converter, PLC industrial computer, test board; Said pressing section comprises that cylinder pressure head, cylinder pressure head drive and uses servomotor; Said bad part eject partly comprises rejects cylinder, rejecting jacking block, the control of rejecting cylinder with solenoid valve, photoelectric sensor; Said display part comprises tensimeter, touch display screen, and said belt hop comprises that feed conveyor belt, discharging travelling belt, belt-driven connect belt with motor, input and output material travelling belt, and the said screw filter cleaner machine that leaks hunting also comprises the screw rod of conveying work pieces and the gas leakage testing agency that utilizes differential pressure principle to detect simultaneously; Screw rod is positioned at a side of test board; Gas leakage testing agency is positioned at the body shell test board under, and there be overlap in gas leakage testing agency more, and is corresponding one by one with test board station on the test board.
The described screw filter cleaner machine that leaks hunting; One end of its screw rod is connected with motor with screw drive; Screw rod is installed on the screw rod stand; The screw rod stand is installed on three screw rod guide rails, and installing on the screw rod guide rail in centre position can adjusting screw(rod) and the screw rod stand control hand wheel of the horizontal relative position of test board.
The described screw filter cleaner machine that leaks hunting, the both sides of its test board have been installed the fence of the restriction location of workpiece.
The described screw filter cleaner machine that leaks hunting; Its gas leakage testing agency comprises differential pressure pick-up, vacuum solenoid valve, measured piece electromagnetic valve of gas circuit, standard component electromagnetic valve of gas circuit, balanced solenoid valve; Vacuum solenoid valve is connected through gas circuit with the standard component electromagnetic valve of gas circuit with the measured piece electromagnetic valve of gas circuit, and the measured piece electromagnetic valve of gas circuit is connected with measured piece through gas circuit, and the standard component electromagnetic valve of gas circuit is connected with standard component through gas circuit; Balanced solenoid valve is on the gas circuit between measured piece and the standard component; Differential pressure pick-up is connected with balanced solenoid valve, and on the gas circuit between measured piece and the standard component, the control end of solenoid valve is connected with the PLC industrial computer in the differential pressure gas leakage test section.
The described screw filter cleaner machine that leaks hunting, its differential pressure pick-up and tensimeter all have many covers, and differential pressure pick-up and tensimeter connect one to one, and tensimeter is with the connection of A/D modular converter, and the A/D modular converter is connected with the PLC industrial computer.
The described screw filter cleaner machine that leaks hunting, its discharging travelling belt is used motor-driven by belt-driven, is connected belt through the input and output material travelling belt between discharging travelling belt and the feed conveyor belt) connect, discharging travelling belt and feed conveyor belt are rotated synchronously.
The described screw filter cleaner machine that leaks hunting; Its photoelectric sensor of rejecting part is positioned at the discharging opening place of checkout equipment and is connected with the PLC industrial computer; The PLC industrial computer is connected with solenoid valve with the control of rejecting cylinder; Reject jacking block and be installed in the end of rejecting cylinder control with solenoid valve, relative with the discharging opening of discharging travelling belt.
The described screw filter cleaner machine that leaks hunting; Its tensimeter has a plurality of; Corresponding one by one with the test board station on the test board, tensimeter and touch display screen are installed in the support of cylinder pressure head, and the display interface of tensimeter and touch-screen is positioned at machine display panel one side of leaking hunting.
Technique effect
The beneficial effect that technical scheme of the present invention is brought is following:
1, the present invention's ripe PLC control technology of sampling realizes that the full-automation of filter cleaner detects, and single can detect a plurality of filter cleaners simultaneously, has the bad part eject mechanism of robotization, has accelerated detection speed, has adapted to the demand of industrialized mass production;
2, the present invention adopts high precision differential pressure pick-up and vertical compression sensor to carry out the impermeability detection, reduces the error that manual detection produces, and has improved precision and reliability that filter cleaner detects greatly;
3, the present invention provides abundant system information and operation information with tensimeter and the touch display screen human-computer interaction interface as testing apparatus, has simplified operation and plant maintenance process, makes operation interface hommization more.
4, the present invention carries out dynamic tracking to system operational parameters, and the force value of each station measured piece is all shown with numeral, and pressure changes and comes into plain view.
Description of drawings
Fig. 1 is the screw filter cleaner machine outside drawing that leaks hunting;
Fig. 2 is the screw filter cleaner machine exploded view that leaks hunting;
Fig. 3 is the screw filter cleaner machine running part outside drawing that leaks hunting;
Fig. 4 is the screw filter cleaner electro-mechanical principle block diagram that leaks hunting;
Fig. 5 is the screw filter cleaner machine list station gas leakage testing agency gas circuit block diagram that leaks hunting.
Label declaration:
1 feed conveyor belt, 2 discharging travelling belts
3 belt-driven connect belt with motor 4 input and output material travelling belts
5 test board stations, 6 test boards
7 screw rods, 8 screw drive are used motor
9 screw rod guide rails, 10 screw rod stands
11 screw rod stand control hand wheels, 12 fences
13 reject cylinder 14 rejects jacking block
15 reject cylinder control with solenoid valve 16 photoelectric sensors
17 cylinder pressure heads, 18 cylinder pressure heads drive uses servomotor
19 machine display panel 20 tensimeters that leak hunting
21 touch display screen 22PLC industrial computers
23A/D modular converter 24 differential pressure pick-ups
25 vacuum solenoid valves, 26 measured piece electromagnetic valve of gas circuit
27 standard component electromagnetic valve of gas circuit, 28 balanced solenoid valves
29 body shells, 30 top covers
31 supports
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Screw filter cleaner of the present invention leak hunting outward appearance such as Fig. 1, Fig. 2 and shown in Figure 3 of machine, pressing section, bad part eject part, display part, belt hop, screw rod 7, A/D modular converter 23, PLC industrial computer 22, test board 6.Hold-down mechanism comprises that cylinder pressure head 17, cylinder pressure head drive with servomotor 18, and hold-down mechanism is used for when inflating to measured workpiece by the press fit measured piece.Bad part eject mechanism comprises rejects cylinder 13, rejecting jacking block 14, the control of rejecting cylinder with solenoid valve 15, photoelectric sensor 16; Photoelectric sensor 16 is positioned at the discharging opening place of checkout equipment and is connected with PLC industrial computer 22; PLC industrial computer 22 is connected with solenoid valve 15 with the control of rejecting cylinder; Reject cylinder control and can drive rejecting jacking block 14 in the direction activity vertical, reject substandard product with discharging travelling belt 2 with solenoid valve 15.Belt transmission mechanism comprises that feed conveyor belt 1, discharging travelling belt 2, belt-driven connect belt 4 with motor 3, input and output material travelling belt; Feed conveyor belt 1 and discharging travelling belt 2 lay respectively at the feed end and the discharge end of test board 6; Be connected skin 4 bands through the input and output material travelling belt between feed conveyor belt 1 and the discharging travelling belt 2 and be connected, belt-driven drives whole connecting gear and moves through driving discharging travelling belt 2 with motor 3.The display part is installed in the cylinder pressure head support 31, comprises tensimeter 20 and touch display screen 21, and tensimeter 20 is used to show the test data of measured workpiece, and touch display screen 21 is used for the Operation and Maintenance screw filter cleaner machine that leaks hunting.One end of screw rod 7 is connected with motor 8 with screw drive; Screw rod 7 is installed on the screw rod stand 10; Screw rod stand 10 is installed on three screw rod guide rails 9; Installing on the screw rod guide rail 9 in centre position can adjusting screw(rod) 7 and the screw rod stand control hand wheel 11 of test board 6 horizontal relative positions, and the fence 12 of the restriction location of workpiece has been installed in the both sides of test board 6.Horizontal range between screw rod 6 and the fence 12 can be regulated through screw rod stand control hand wheel 11, to adapt to the workpiece of different sizes.During screw rod 7 work workpiece for measurement is pressed from both sides to the station of test board.
Electric theory diagram of the present invention is as shown in Figure 4; PLC industrial computer 22 drives with servomotor 18, belt-driven with the cylinder pressure head and is connected with solenoid valve 15, gas leakage testing agency part solenoid valve with motor 3, the control of rejecting cylinder; Action through motor and the various topworkies of solenoid control; Differential pressure pick-up 24 is connected with tensimeter 20, and tensimeter 20 is connected with A/D modular converter 23, and A/D modular converter 23 is sent to PLC industrial computer 22 with test data.Touch display screen 21 directly is connected with PLC industrial computer 22 with photoelectric sensor 16.
The differential pressure gas leakage testing agency gas circuit block diagram of the single station of the present invention is as shown in Figure 4; Gas circuit adopts symmetric design; So that measured piece gas circuit and standard component gas circuit possess necessary the same terms; Source of the gas is inflated system through filtering the decompression back; The switching of five states of the whole sense cycle of on-off controlling system of vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 and balanced solenoid valve 28, five state phases of system are respectively: inflation phase, balance period, measurement phase, venting phase, standby phase.During measuring, the pressure at differential pressure pick-up 24 continuous examination criteria spares and measured piece two ends, when reaching the test duration, if the pressure differential at standard component and measured piece two ends less than set pressure, then measured piece is qualified; Otherwise, defective.Measurement is divided into two stages, and its first testing process is as follows:
1. inflate the phase: vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 and balanced solenoid valve 28 energisings, valve open;
2. balance period: vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26,27 outages of standard component electromagnetic valve of gas circuit, valve closing, balanced solenoid valve 28 is opened;
3. measure the phase: vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 and outage, valve closing, balanced solenoid valve 28 is opened;
4. exit the phase: vacuum solenoid valve 25, standard component electromagnetic valve of gas circuit 27, balanced solenoid valve 28 outages, valve closing, measured piece electromagnetic valve of gas circuit 26 is opened;
5. standby phase: vacuum solenoid valve 25, standard component electromagnetic valve of gas circuit 27, balanced solenoid valve 28 outages, valve closing, measured piece electromagnetic valve of gas circuit 26 is opened;
When measuring for the second time, for improving the efficient that detects, the state of valve switches difference to some extent, and its process is following:
1. inflate the phase: vacuum solenoid valve 25,26 energisings of measured piece electromagnetic valve of gas circuit, valve open;
2. balance period: vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 are opened (first balance period); Vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 are closed, and balanced solenoid valve 28 is opened (second balance period);
3. measure the phase: vacuum solenoid valve 25, measured piece electromagnetic valve of gas circuit 26, standard component electromagnetic valve of gas circuit 27 are closed, and balanced solenoid valve 28 is opened;
4. exit the phase: vacuum solenoid valve 25, standard component electromagnetic valve of gas circuit 27, balanced solenoid valve 28 outages, valve closing, measured piece electromagnetic valve of gas circuit 26 is opened;
5. standby phase: vacuum solenoid valve 25, standard component electromagnetic valve of gas circuit 27, balanced solenoid valve 28 outages, valve closing, measured piece electromagnetic valve of gas circuit 26 is opened.
Claims (6)
1. screw filter cleaner machine that leaks hunting; Comprise pressing section, bad part eject part, display part, belt hop, A/D modular converter (23), PLC industrial computer (22), test board (6); Said pressing section comprises that cylinder pressure head (17), cylinder pressure head drive with servomotor (18); Said bad part eject partly comprises rejects cylinder (13), rejecting jacking block (14), the control of rejecting cylinder with solenoid valve (15), photoelectric sensor (16); Said display part comprises tensimeter (20), touch display screen (21); Said belt hop comprises that feed conveyor belt (1), discharging travelling belt (2), belt-driven connect belt (4) with first motor (3), input and output material travelling belt; It is characterized in that: the said screw filter cleaner machine that leaks hunting also comprises the screw rod (7) of conveying work pieces and the gas leakage testing agency that utilizes differential pressure principle to detect simultaneously, and screw rod (7) is positioned at a side of test board, and gas leakage testing agency is positioned at the body shell (29) under the test board (6); There are many covers in gas leakage testing agency, and is corresponding one by one with test board station (5) on the test board (6);
Described gas leakage testing agency comprises differential pressure pick-up (24), vacuum solenoid valve (25), measured piece electromagnetic valve of gas circuit (26), standard component electromagnetic valve of gas circuit (27), balanced solenoid valve (28), and said vacuum solenoid valve (25) connects measured piece electromagnetic valve of gas circuit (26) and standard component electromagnetic valve of gas circuit (27) through gas circuit; Measured piece electromagnetic valve of gas circuit (26) is connected with measured piece through gas circuit; Standard component electromagnetic valve of gas circuit (27) is connected with standard component through gas circuit; Balanced solenoid valve (28) is on the gas circuit between measured piece and the standard component; Differential pressure pick-up (24) is parallelly connected with balanced solenoid valve (28), and also on the gas circuit between measured piece and the standard component, the control end of the above-mentioned solenoid valve in the gas leakage testing agency all is connected with PLC industrial computer (22);
The photoelectric sensor (16) of described bad part eject part is positioned at the discharging opening place of discharging travelling belt (2) and is connected with PLC industrial computer (22); PLC industrial computer (22) is connected with solenoid valve (15) with the control of rejecting cylinder; Reject jacking block (14) and be installed in the end of rejecting cylinder control with solenoid valve (15), relative with the discharging opening of discharging travelling belt (2).
2. the screw filter cleaner according to claim 1 machine that leaks hunting; It is characterized in that: an end of screw rod (7) is connected with second motor (8) with screw drive; Screw rod (7) is installed on the screw rod stand (10); Screw rod stand (10) is installed on three screw rod guide rails (9), and going up installation at the screw rod guide rail (9) in centre position can adjusting screw(rod) (7) and the screw rod stand control hand wheel (11) of the horizontal relative position of test board (6).
3. the screw filter cleaner according to claim 1 and 2 machine that leaks hunting is characterized in that: the fence (12) of the restriction location of workpiece has been installed in the both sides of test board (6).
4. the screw filter cleaner according to claim 1 machine that leaks hunting; It is characterized in that: differential pressure pick-up (24) all has many covers with tensimeter (20); Differential pressure pick-up (24) connects one to one with tensimeter (20); Tensimeter (20) connects with A/D modular converter (23), and A/D modular converter (23) is connected with PLC industrial computer (22).
5. the screw filter cleaner according to claim 1 machine that leaks hunting; It is characterized in that: discharging travelling belt (2) is driven with first motor (3) by belt-driven; Be connected belt (4) through the input and output material travelling belt between discharging travelling belt (2) and the feed conveyor belt (1) and connect, discharging travelling belt (2) rotates with feed conveyor belt (1) synchronously.
6. the screw filter cleaner according to claim 1 machine that leaks hunting; It is characterized in that: tensimeter (20) has a plurality of; Corresponding one by one with the test board station (5) on the test board (6); Tensimeter (20) and touch display screen (21) are installed in the support of cylinder pressure head (17), and the display interface of tensimeter and touch display screen (21) is positioned at machine display panel (19) one sides of leaking hunting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101147240A CN102169042B (en) | 2010-02-26 | 2010-02-26 | Screw type filter leakage-detecting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101147240A CN102169042B (en) | 2010-02-26 | 2010-02-26 | Screw type filter leakage-detecting machine |
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| Publication Number | Publication Date |
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| CN102169042A CN102169042A (en) | 2011-08-31 |
| CN102169042B true CN102169042B (en) | 2012-08-29 |
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| CN2010101147240A Expired - Fee Related CN102169042B (en) | 2010-02-26 | 2010-02-26 | Screw type filter leakage-detecting machine |
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| CN104280192A (en) * | 2014-05-20 | 2015-01-14 | 安徽高德韦尔精密部件有限公司 | PU valve quality control device |
| CN105665298B (en) * | 2016-01-18 | 2024-05-10 | 上海比泽机电设备科技有限公司 | Full-automatic four-way valve internal leakage test bench |
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| CN107389281A (en) * | 2017-08-30 | 2017-11-24 | 常州安智能科技有限公司 | A kind of buzzer air-tightness automatic detection selects equipment |
| CN107727330B (en) * | 2017-09-29 | 2020-04-28 | 郑州斯倍思机电有限公司 | Filter connecting pipe assembling air tightness test bench and use method thereof |
| CN109205275A (en) * | 2018-08-07 | 2019-01-15 | 安徽信息工程学院 | Filter detects piece uploading control method |
| CN112536244A (en) * | 2020-11-24 | 2021-03-23 | 德清天盛轻工工艺制品有限公司 | Water injection base sealing performance detection method |
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| CN2395265Y (en) * | 1999-11-22 | 2000-09-06 | 番禺市科腾工业有限公司 | Light touch screen computer gas seal property detector |
| CN101402013A (en) * | 2008-10-31 | 2009-04-08 | 敬林 | Detecting and maintaining apparatus for dry type filter element of air filter for automobile |
| CN201242489Y (en) * | 2008-08-20 | 2009-05-20 | 长春云顶汽车部件有限公司 | Experimental bench for air tightness of engine oil cleaner |
| CN201622158U (en) * | 2010-02-26 | 2010-11-03 | 陈增荣 | Screw filter leakage detecting machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4768372A (en) * | 1985-04-09 | 1988-09-06 | Martin Lehmann | Test device, in particular for bottle-shaped containers as well as procedure for testing same |
| JPS6447928A (en) * | 1987-08-19 | 1989-02-22 | Toyo Seikan Kaisha Ltd | Leakage detector for sealed container |
| JP3002999B2 (en) * | 1990-08-09 | 2000-01-24 | 日本鋼管継手株式会社 | Airtight leak inspection equipment for fittings |
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2010
- 2010-02-26 CN CN2010101147240A patent/CN102169042B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395265Y (en) * | 1999-11-22 | 2000-09-06 | 番禺市科腾工业有限公司 | Light touch screen computer gas seal property detector |
| CN201242489Y (en) * | 2008-08-20 | 2009-05-20 | 长春云顶汽车部件有限公司 | Experimental bench for air tightness of engine oil cleaner |
| CN101402013A (en) * | 2008-10-31 | 2009-04-08 | 敬林 | Detecting and maintaining apparatus for dry type filter element of air filter for automobile |
| CN201622158U (en) * | 2010-02-26 | 2010-11-03 | 陈增荣 | Screw filter leakage detecting machine |
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| Title |
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| JP平4-93740A 1992.03.26 |
| JP昭64-47928A 1989.02.22 |
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| CN102169042A (en) | 2011-08-31 |
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Application publication date: 20110831 Assignee: Xiangtan Jianglu Precise Machinery Co., Ltd. Assignor: Chen Zengrong Contract record no.: 2013430000078 Denomination of invention: Screw type filter leakage-detecting machine Granted publication date: 20120829 License type: Exclusive License Record date: 20130529 |
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Assignee: Xiangtan Jianglu Precise Machinery Co., Ltd. Assignor: Chen Zengrong Contract record no.: 2013430000078 Date of cancellation: 20160420 |
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