CN101881690B - High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve - Google Patents
High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve Download PDFInfo
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- CN101881690B CN101881690B CN2010101951294A CN201010195129A CN101881690B CN 101881690 B CN101881690 B CN 101881690B CN 2010101951294 A CN2010101951294 A CN 2010101951294A CN 201010195129 A CN201010195129 A CN 201010195129A CN 101881690 B CN101881690 B CN 101881690B
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Abstract
The invention relates to a high-pressure closing sealed detection table and a detection method for a liquefied petroleum gas cylinder valve, which belong to the technical field of detection instruments. The invention is characterized in that the high-pressure closing sealed detection table mainly consists of a main framework, a lifting mechanism, a side sealing degree mechanism, a back force mechanism, a sensor conversion mechanism and a gas exhaust mechanism. The method comprises the following steps that the test gas is mixed gas of 6 to 4 percent of hydrogen gas and 94 to 96 percent of nitrogen gas, and a gas-sensitive sensor detects the hydrogen gas. When an element to be detected has the leakage, the gas-sensitive sensor detects the hydrogen gas and generates electric signals to be output, the gas-sensitive sensor uploads the electric signals to an analog quantity module of a PLC, and the PLC firstly converts the electric signals into the PPM of the hydrogen gas, and then converts the electric signals into the leakage quantity (ml/h) according to the PPM thereof. The invention has the advantages that compared with a method of using a pressure difference sensor for detecting the leakage, the method of using the gas-sensitive sensor for detecting the leakage greatly shortens the detection time, improves the detection efficiency, and has obviously improved efficiency and has high precision particularly for 100 percent detected products.
Description
Technical field
The invention belongs to the detecting instrument technical field.
Background technology
At present; The manufacturer of China's liquefied petroleum gas cylinder valve is according to GB7512-2006 " liquefied petroleum gas cylinder valve examination criteria "; Adopt water cannot detect the impermeability of liquefied petroleum gas cylinder valve; Putting into water after measured piece is full of air, whether have bubble produce, produce the degree of how much judging leakage of bubble through certain hour if observing.This method is simple to operate, does not need the higher technology of operating personnel, can determine the particular location of leakage; But this kind method is influenced by human factor, and error is bigger, can't carry out quantitative analysis to leakage; Can't realize the production automation; Production efficiency is low, surface treatment such as need dry, anticorrosion simultaneously to the workpiece after detecting, and has increased the detection cost.
Summary of the invention
The objective of the invention is: high-pressure closing sealed monitor station of a kind of liquefied petroleum gas cylinder valve and detection method are provided, and it can be efficiently, the impermeability to liquefied petroleum gas cylinder valve detects quickly and accurately.
The technical scheme of high-pressure closing sealed monitor station of the present invention is: mainly be made up of main frame, lifting mechanism, side seal degree mechanism, back strength mechanism, sensor throw-over gear and exhaust gear.
Main frame is the rectangle frame support body; Deck plate central part at main frame is equipped with lifting mechanism; Retaining valve links to each other with spherical structure through T type groove with the lifting cylinder; Lifting cylinder both sides are equipped with the guide frame that is made up of axis of guide A4 and linear bearing A, and axis of guide A is a right cylinder, in linear bearing A, can move up and down; Axis of guide A and retaining valve all are fixed on the raising board, and straight pin is installed on diagonal on the raising board, and straight pin is connected with raising board through helicitic texture, cylindrical seam location; Pallet is square pallet, is positioned at the raising board top, and through being installed in 2 straight pin location on the raising board, the upper surface of pallet and the lower surface of raising board fit tightly; The top of raising board is equipped with mould, and the inner chamber of mould can hold measured piece for the imitative type of measured piece profile.
The below of top board is equipped with side seal stifled mechanism, back strength mechanism and sensor throw-over gear; Shutoff cylinder in the stifled mechanism of side seal is the cylinder that has guide frame, and the plugging block shaped bodies is a rectangle, right cylinder of side protrusion; Through screw retention on the shutoff cylinder; Plugging block inside is drilled with 2 blind holes that become 90 degree and intersect, and an end communicates with gas sensor, and the other end communicates with the measured piece cavity.
The sensor transformational structure is positioned at the top of the stifled mechanism of side seal; The sensor conversion cylinder is fixed on the upper surface of plugging block through the T-steel plate, and sensor fixation plate is the rectangle nylon block, and sensor fixation plate one side is a T type groove; Sensor conversion cylinder front end is installed the multidiameter that has sphere; Sphere is put contact matching in T type groove, sensor fixation plate is drilled with 2 or several holes along long side direction, and a gas sensor is installed in each hole; Spring assembly is enclosed within on the straight pin.
Back strength mechanism is positioned at the opposite of the stifled mechanism of side seal, and the back strength cylinder is fixed on the back strength cylinder installing plate, cylindrical seam location; Back strength cylinder both sides are equipped with the guiding mechanism that is made up of axis of guide B and linear bearing B, and the back strength plate is a T template, and the centre is a U type groove; Respectively there is a hole at the both shoulders place; The end of axis of guide B is an external thread, passes this hole, screws through nut; The back strength plate links to each other with spherical structure through T type groove with the back strength cylinder, and the upper surface of back strength plate contacts with the lower surface of a rectangular steel plates, and rectangular steel plates is fixed on the top board through column, and back strength cylinder installing plate is fixed on the support column through U type spare.
Top board top be that exhaust gear use gas path plate with test, and exhaust gear is made up of axial flow blower and the air channel that matches thereof, tests with gas admittance valve and vertical compression sensor are installed on the gas path plate, and test gas passes through gas admittance valve entering test chamber.
Detection method of the present invention is:
Test gas is the mixed air of 6%-4% hydrogen and 94%-96% nitrogen, and gas sensor detects hydrogen.
When measured piece had leakage, gas sensor detected hydrogen and produces electric signal output, and gas sensor is uploaded to the analog module of PLC with electric signal, and PLC becomes electrical signal conversion the PPM of hydrogen earlier, converts amount of leakage (ml/h) to according to its PPM again.
PLC will measure the amount of leakage numerical value and the standard value of gained and make comparisons, and it is qualified to judge whether.
The invention has the beneficial effects as follows: utilize the gas sensor detection of leaks and utilize the detection of leaks of differential pressure pick-up to compare; The gas sensor detection of leaks has significantly been reduced detection time; Improved detection efficiency; Especially for the product of 100% detection, the raising of its efficient is quite obvious, and precision is high.
This checkout equipment adopts two gas sensors.When product had big leakage, gas sensor needed long release time, so adopt two gas sensors, when testing, used one, another recovery at every turn.If desired, this checkout equipment can adopt more gas sensor.
Description of drawings
Fig. 1 is master's TV structure figure of the present invention;
Fig. 2 is the present invention left side TV structure figure.
Embodiment
Embodiment 1
As shown in the figure, the 1st, burr adjustable tail margin, the 2nd, framework, the 3rd, lifting cylinder, the 4th, axis of guide A, the 5th, deck plate, the 6th, linear bearing A, the 7th, retaining valve, the 8th, back strength cylinder, the 9th, axis of guide B, the 10th, linear bearing B, the 11st, back strength cylinder installing plate, the 12nd, gas path plate, the 13rd, axial flow blower, the 14th, top board, the 15th, spring assembly, the 16th, sensor fixation plate, the 17th, sensor conversion cylinder, the 18th, shutoff cylinder, the 19th, plugging block, the 20th, support column, the 21st, back strength plate, the 22nd, measured piece, the 23rd, pallet, the 24th, raising board.
Can checkout equipment be divided into main frame, lifting mechanism, side seal degree mechanism, back strength mechanism, sensor throw-over gear and exhaust gear by function.
Main frame is made up of burr adjustable tail margin 1, framework 2, deck plate 5, top board 14 and support column 20.Framework 2 is welded by the 40x40x5 square steel, is framed structure, and 4 burr adjustable tail margins 1 are equipped with in the below, and each column below respectively has 1, can adjust height up and down through the helicitic texture on the burr adjustable tail margin 1; Deck plate 5 is a rectangular steel plates, is fixed on the framework 2 through 8 M6 socket head cap screws; Top board 14 is a rectangular steel plates, be positioned at deck plate 5 directly over, 4 support columns 20 are installed between top board 14 and the deck plate 5, support column 20 is a right cylinder, an end is a flange arrangement, the other end is an external thread, 20 of support columns support and positioning action; Support column 20 is located through cylindrical seam with deck plate 5, and 4 M5 socket head cap screws connect, and support column 20 and top board 14 are through cylindrical seam location, and 1 M16 nut is fixed.
Lifting mechanism is made up of lifting cylinder 3, axis of guide A4, linear bearing A6, retaining valve 7, pallet 23 and raising board 24, is installed on the deck plate 5.Lifting cylinder 3 connects through 4 M10 socket head cap screws, cylindrical seam location; Retaining valve 7 links to each other with spherical structure through T type groove with lifting cylinder 3, but automatic aligning; Retaining valve 7 is an one-way valve structures, relies on external force to open, and spring reset adopts end face seal structure, and the side has air intake opening, and the upper surface of retaining valve 7 is equipped with circular shutoff pad; For preventing to rotate, lifting cylinder 3 both sides are equipped with the guide frame that is made up of axis of guide A4 and linear bearing A6, and linear bearing A6 is fixed on the deck plate 5 through 4 M5 socket head cap screws, and axis of guide A4 is a right cylinder, in linear bearing A6, can move up and down; Axis of guide A4 and retaining valve 7 all are fixed on the raising board 24; Cylindrical seam location, raising board 24 is square steel plate, the upper surface of retaining valve 7 is a flange arrangement; Be connected with raising board 24 through 4 M6 socket head cap screws, axis of guide A4 fixes through 1 M8 socket head cap screw; 2 Φ 16 straight pins are installed on diagonal on the raising board 24, and straight pin is connected with raising board 24 through the M10 helicitic texture, cylindrical seam location; Pallet 23 is square pallet, is positioned at raising board 24 tops, and through being installed in 2 straight pin location on the raising board 24, during work, the lower surface of the upper surface of pallet 23 and raising board 24 fits tightly; The top of raising board 24 is equipped with mould, and the inner chamber of mould can hold measured piece 22 with reference to the imitative type of measured piece profile, and outside surface is a right cylinder, and through cylindrical seam location, 4 M5 socket head cap screws are fixed.
The below of top board 14 is equipped with side seal stifled mechanism, back strength mechanism and sensor throw-over gear.The stifled mechanism of side seal is made up of shutoff cylinder 18 and plugging block 19.Shutoff cylinder 18 is fixed on the rectangular steel plates 1 through 2 M8 socket head cap screws, cylindrical seam location, and shutoff cylinder 18 is for having the cylinder of guide frame; Steel plate 1 is fixed on 2 rectangular steel plates 2 through 4 M5 socket head cap screws, and 2 block plates 2 are fixed on the top board 14 through 4 M8 socket head cap screws, have lightening hole on the steel plate 2; Plugging block 19 shaped bodies are rectangle, and protrusion right cylinder in side is fixed on the shutoff cylinder 18 through 2 M6 socket head cap screws; Plugging block 19 inside are drilled with 2 blind holes that become 90 degree and intersect, and an end communicates with gas sensor, and the other end communicates with measured piece 22 cavitys; The right cylinder of plugging block 19 sides protrusion has external thread, through nut one block head is fixed, and can be changed block head through unscrewing nut at any time.
The sensor transformational structure is positioned at the top of the stifled mechanism of side seal, is made up of spring assembly 15, sensor fixation plate 16 and sensor conversion cylinder 17.Sensor conversion cylinder 17 is fixed on the steel plate of a T type through 2 M5 socket head cap screws, and the T-steel plate is fixed on the upper surface of plugging block 19 through 4 M5 socket head cap screws; Sensor fixation plate 16 is the rectangle nylon block; Sensor fixation plate one side is a T type groove; Sensor conversion cylinder 17 front ends are installed the multidiameter that has sphere, and sphere is put contact matching in T type groove, but automatic aligning; Sensor fixation plate 16 is drilled with 2 holes along long side direction, and a gas sensor is installed in each hole; Spring assembly 15 is enclosed within on the straight pin; Totally 4; 4 straight pin one ends are fixed on the foursquare steel plate, and the upper end is through 4 nut holddown spring assemblies 15, and the other end is fixed on the plugging block 19; There is a L type part below of per 2 spring assemblies 15, and this part makes the upper surface pressing of the lower surface and the T-steel plate of sensor fixation plate 16.
Back strength mechanism is positioned at the opposite of the stifled mechanism of side seal, is made up of back strength cylinder 8, axis of guide B9, linear bearing B10, back strength cylinder installing plate 11 and back strength plate 21.Back strength cylinder 8 is fixed on the back strength cylinder installing plate 11 through 4 M10 socket head cap screws, cylindrical seam location; Back strength cylinder 8 both sides are equipped with the guiding mechanism that is made up of axis of guide B9 and linear bearing B10, and linear bearing B10 is fixed on the back strength cylinder installing plate 11 through 4 M4 socket head cap screws; Back strength plate 21 is a T-steel plate, and the centre is a U type groove, and respectively there is a hole at the both shoulders place, and the end of axis of guide B9 is an external thread, passes this hole, screws through nut; Back strength plate 21 links to each other with spherical structure through T type groove with back strength cylinder 8, but automatic aligning, the upper surface of back strength plate 21 contacts with the lower surface of a rectangular steel plates, and this rectangular steel plates is fixed on the top board 14 through 4 columns; Back strength cylinder installing plate 11 is a rectangular steel plates, is fixed on the support column 20 through 4 U type spares.
The checkout equipment course of action:
In mould, put into measured piece 22; Open gas admittance valve, after the vertical compression sensor reached requirement to test pressure, the piston rod of lifting cylinder 3 stretched out; Lifting mechanism drives measured piece and upwards arrives primary importance; The piston rod of back strength cylinder 8 stretches out, and the U type groove of back strength plate 21 entangles measured piece, the lifting mechanism arrival second place that continues to move up.At this moment, the lower surface of back strength plate 21 contacts with the boss place of measured piece, and this position is a test position, and the circular shutoff pad of retaining valve 7 upper surfaces is sealed the air intake opening of measured piece, and the retaining valve top is opened by downforce.The piston rod of shutoff cylinder 18 stretches out, the gas outlet that measured piece is sealed by the stifled mechanism of side seal, and the piston rod of sensor conversion cylinder 17 stretches out or withdraws, and a certain gas sensor is communicated with the measured piece cavity, begins to carry out leak-testing.Detection finishes, and gas exhauster is purchased energized, start working, and the withdrawal of the stifled mechanism of side seal, lifting mechanism falls back to primary importance, the withdrawal of back strength mechanism, lifting mechanism falls back to initial position.When the gas sensor magnitude of voltage was stablized, the outage of air draft mechanism quit work, and places new part, and a beginning new round detects.
Principle of work:
Test gas is the mixed air of 4%-6% hydrogen and 94%-96% nitrogen, and gas sensor detects hydrogen.When measured piece has leakage; Gas sensor detects hydrogen and produces electric signal output, and gas sensor is uploaded to the analog module of PLC with electric signal, and PLC becomes electrical signal conversion the PPM of hydrogen earlier; Convert amount of leakage (ml/h) to according to its PPM again; Afterwards, PLC will measure the amount of leakage numerical value and the standard value of gained and make comparisons, and it is qualified to judge whether.
Claims (2)
1. high-pressure closing sealed monitor station of liquefied petroleum gas cylinder valve is characterized in that:
Main frame is the rectangle frame support body; Deck plate central part at main frame is equipped with lifting mechanism; Retaining valve links to each other with spherical structure through T type groove with lifting cylinder in the lifting mechanism; Lifting cylinder both sides are equipped with the guide frame that is made up of axis of guide A and linear bearing A, and axis of guide A is a right cylinder, in linear bearing A, can move up and down; Axis of guide A and retaining valve all are fixed on the raising board, and straight pin is installed on diagonal on the raising board, and straight pin is connected with raising board through helicitic texture, cylindrical seam location; Pallet is square pallet, is positioned at the raising board top, and through being installed in 2 straight pin location on the raising board, the lower surface of pallet and the upper surface of raising board fit tightly; Mould is installed above the pallet, and the inner chamber of mould can hold measured piece for the imitative type of measured piece profile;
Top board links together through four cylindrical support column in the main frame and deck plate, deck plate below, top board is up; The below of top board is equipped with side seal stifled mechanism, back strength mechanism and sensor throw-over gear; Shutoff cylinder in the stifled mechanism of side seal is the cylinder that has guide frame, and the plugging block shaped bodies is a rectangle, right cylinder of side protrusion; Through screw retention on the shutoff cylinder; Plugging block inside is drilled with 2 blind holes that become 90 degree and intersect, and an end communicates with gas sensor, and the other end communicates with the measured piece cavity;
Sensor throw-over gear is positioned at the top of the stifled mechanism of side seal; Sensor conversion cylinder in the sensor throw-over gear is fixed on the upper surface of plugging block through the T-steel plate, and sensor fixation plate is the rectangle nylon block, and sensor fixation plate one side is a T type groove; Sensor conversion cylinder front end is installed the multidiameter that has sphere; Sphere is put contact matching in T type groove, sensor fixation plate is drilled with 2 or several holes along long side direction, and a gas sensor is installed in each hole;
Back strength mechanism is positioned at the opposite of the stifled mechanism of side seal, and the back strength cylinder in the back strength mechanism is fixed on the back strength cylinder mounting plate, cylindrical seam location; Back strength cylinder both sides are equipped with the guiding mechanism that is made up of axis of guide B and linear bearing B, and the back strength plate is a T template, and the centre is a U type groove; Respectively there is a hole at the both shoulders place; The end of axis of guide B is an external thread, passes this hole, screws through nut; The back strength plate links to each other with spherical structure through T type groove with the back strength cylinder, and the upper surface of back strength plate contacts with the lower surface of a rectangular steel plates, and rectangular steel plates is fixed on the top board through column, and the back strength cylinder mounting plate is fixed on the support column through U type spare;
Top board top be that exhaust gear use gas path plate with test, and exhaust gear is made up of axial flow blower and the air channel that matches thereof, tests with gas admittance valve and vertical compression sensor are installed on the gas path plate, and test gas passes through gas admittance valve entering measured piece cavity.
2. one kind is used the high-pressure closing sealed detection method of liquefied petroleum gas cylinder valve of monitor station according to claim 1, and its method is:
A, test gas are the mixed air of 4%-6% hydrogen and 94%-96% nitrogen, and gas sensor detects hydrogen;
B, when measured piece has leakage, gas sensor detects hydrogen and produces electric signal output, gas sensor is uploaded to the analog module of PLC with electric signal, PLC becomes electrical signal conversion the PPM of hydrogen earlier, converts amount of leakage to according to its PPM again;
C, PLC will measure the amount of leakage numerical value and the standard value of gained and make comparisons, and it is qualified to judge whether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101951294A CN101881690B (en) | 2010-06-09 | 2010-06-09 | High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101951294A CN101881690B (en) | 2010-06-09 | 2010-06-09 | High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve |
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| Publication Number | Publication Date |
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| CN101881690A CN101881690A (en) | 2010-11-10 |
| CN101881690B true CN101881690B (en) | 2012-05-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102928183B (en) * | 2012-11-27 | 2015-12-23 | 长春工业大学 | Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit |
| CN105784281A (en) * | 2014-12-22 | 2016-07-20 | 珠海格力电器股份有限公司 | Air conditioner indoor unit leakage detection method |
| CN109141760A (en) * | 2018-11-01 | 2019-01-04 | 金华华鼎科技有限公司 | Hydrostatic testing machine |
| CN109781350A (en) * | 2019-02-19 | 2019-05-21 | 青岛固拓自动化设备有限公司 | A kind of double-movement air-leakage test plugging device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2213336Y (en) * | 1994-02-26 | 1995-11-22 | 龚之璋 | Angle valve leak alarm for LPG cylinder |
| EP0798071A1 (en) * | 1996-03-28 | 1997-10-01 | Shell Internationale Researchmaatschappij B.V. | Installation for processing gas cylinder valves |
| WO2006032591A1 (en) * | 2004-09-22 | 2006-03-30 | Inficon Gmbh | Leak testing method and leak testing device comprising a partial pressure sensor |
| CN101424579A (en) * | 2008-12-09 | 2009-05-06 | 上海电气电站设备有限公司 | Trace air seal leakage method |
| CN201716167U (en) * | 2010-06-09 | 2011-01-19 | 长春工业大学 | Liquefied petroleum gas (LPG) cylinder valve high-pressure closed hermetical detection station |
-
2010
- 2010-06-09 CN CN2010101951294A patent/CN101881690B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2213336Y (en) * | 1994-02-26 | 1995-11-22 | 龚之璋 | Angle valve leak alarm for LPG cylinder |
| EP0798071A1 (en) * | 1996-03-28 | 1997-10-01 | Shell Internationale Researchmaatschappij B.V. | Installation for processing gas cylinder valves |
| WO2006032591A1 (en) * | 2004-09-22 | 2006-03-30 | Inficon Gmbh | Leak testing method and leak testing device comprising a partial pressure sensor |
| CN101424579A (en) * | 2008-12-09 | 2009-05-06 | 上海电气电站设备有限公司 | Trace air seal leakage method |
| CN201716167U (en) * | 2010-06-09 | 2011-01-19 | 长春工业大学 | Liquefied petroleum gas (LPG) cylinder valve high-pressure closed hermetical detection station |
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Effective date of registration: 20111118 Address after: 130021 School of mechanical and electrical engineering, Changchun University of Technology, 2055 Yanan Road, Changchun, Jilin Applicant after: Changchun Polytechnic Univ. Co-applicant after: Jilin Haoran Zhengda Technology Co., Ltd. Address before: 130021 School of mechanical and electrical engineering, Changchun University of Technology, 2055 Yanan Road, Changchun, Jilin Applicant before: Changchun Polytechnic Univ. |
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