CN102928183B - Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit - Google Patents
Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit Download PDFInfo
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- CN102928183B CN102928183B CN201210489937.0A CN201210489937A CN102928183B CN 102928183 B CN102928183 B CN 102928183B CN 201210489937 A CN201210489937 A CN 201210489937A CN 102928183 B CN102928183 B CN 102928183B
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Abstract
Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit, belongs to fields of measurement, overcomes the shortcoming that existing method of testing step is many, efficiency is low, cost is high.The method is under cylinder valve closed condition, is filled with test gas from outlet, reaches shutoff gas circuit after setting value, forms enclosed cavity, measures air pressure change in setting-up time inner sealing chamber, then with the comparison of permission changing value, whether qualified result.The feature of pick-up unit exports in the side seal sprue that docks the air-filled pore opening gas port and the connecting test source of the gas exported to cylinder valve, at the in-built removable gas port shutoff axle of side seal sprue, after shutoff axle recesses gas port, gas port is communicated with through shutoff axle mounting hole with air-filled pore.PLC, according to the pressure sensor signal being communicated with gas port, controls operation and the display result of pick-up unit.What present invention achieves cylinder valve sealing take pressurized air as a step detection method of test gas.Compare with existing air pressure detection method, simplify step, improve efficiency, reduce cost.
Description
Technical field
The invention belongs to fields of measurement, be specifically related to adopt pressure differential method to detect the sealing property of liquefied petroleum gas cylinder valve.
Background technology
The conventional following two kinds of methods of the manufacturer of liquefied petroleum gas cylinder valve carried out the detection of high-low pressure sealing property to liquefied petroleum gas cylinder valve in the past: it 1 is according to GB7512-2006 " liquefied petroleum gas cylinder valve ", adopt water cannot detect the impermeability of liquefied petroleum gas cylinder valve, namely manual mode is adopted to be screwed respectively by liquefied petroleum gas cylinder valve to closure or openness state, water is put into after being full of air, observe whether have bubble to produce, by certain hour produce bubble number judge leakage degree.This detection method advantage is simple to operate, does not need the technology that operating personnel are higher, with the naked eye just can determine the particular location of leakage; Shortcoming is affected by human factors, and manual operation error is comparatively large, and cannot carry out determining quantitative analysis to leakage, cannot realize the production automation, production efficiency is low, and testing cost is high, and the hand of operator need be immersed in water for a long time, neither science also wound body;
It 2 is adopt gas sensor to detect the method for gas concentration to detect liquefied petroleum gas cylinder valve sealing property, test gas adopts the mixed air be made up of hydrogen and nitrogen, completes high-low pressure sealing property respectively and detect during detection under liquefied petroleum gas cylinder valve will be made to be in opening and closing two states respectively on the monitor station of opening and closing.First the liquefied petroleum gas cylinder valve being in opening is placed on liquefied petroleum gas cylinder valve opening low pressure seal monitor station in operating process, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and outlet, the combination gas be made up of hydrogen and nitrogen is filled with from its import, after pressurize certain hour, as gas sensor detects hydrogen, liquefied petroleum gas cylinder valve seal gasket or O type circle poor sealing are described, have leakage, otherwise then without leakage; Again the liquefied petroleum gas cylinder valve being in opening is placed on afterwards on liquefied petroleum gas cylinder valve opening high pressure sealing monitor station, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and outlet, the combination gas be made up of hydrogen and nitrogen is filled with from its import, after pressurize certain hour, as gas sensor detects hydrogen, liquefied petroleum gas cylinder valve seal gasket or O type circle poor sealing are described, have leakage, otherwise then without leakage; Closed with certain moment of torsion detecting qualified liquefied petroleum gas cylinder valve in the on state screwing worktable more afterwards, be placed on liquefied petroleum gas cylinder valve closure state high pressure sealing monitor station again, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and outlet, the combination gas be made up of hydrogen and nitrogen is filled with from its import, after pressurize certain hour, as gas sensor detects hydrogen, valve and the valve body contact face poor sealing of liquefied petroleum gas cylinder valve are described, there is leakage, otherwise then without leakage.
Obviously, although the method that gas sensor detects gas concentration can carry out determining quantitative analysis to leakage, and can the production automation be realized, but the greatest problem existed the detection of liquefied petroleum gas cylinder valve is divided into opening and closing two states substep to complete, when detecting, gas sensor also needs longer stabilization time after having detected at every turn simultaneously, the serviceable life of gas sensor is shorter again, and adopt again the combination gas be made up of hydrogen and nitrogen to be test gas, not only running program complexity is loaded down with trivial details for this, inefficiency, and waste time and energy, checkout equipment investment is large, testing cost is high.
Summary of the invention
Object of the present invention is just to provide a kind of liquefied petroleum gas cylinder valve high-low pressure and seals a step detection method, only be in closed state at liquefied petroleum gas cylinder valve and once complete high pressure or low pressure seal Performance Detection, overcome that existing method of testing detecting step is many, detection time length, complicated operation, high, the inefficient shortcoming of cost.
Another object of the present invention provides a kind of pick-up unit, makes detection method of the present invention be able to industrial applications.
Liquefied petroleum gas cylinder valve high-low pressure sealing property detecting method of the present invention is: under liquefied petroleum gas cylinder valve is in closed condition, test gas is filled with from liquefied petroleum gas cylinder valve exit, after accurate range of set value up to standard, shutoff gas circuit, form the test chamber closed, measure the air pressure change in setting-up time inner sealing test chamber with the pressure transducer be communicated with test chamber, numerical value will be changed and standard allows changing value comparison, whether qualified testing result; Collection and the calculation procedure of pressure reading are: after shutoff gas circuit, can arrange through setting value T1(stabilization time of a setting), when pressure transducer record pressure be not less than pressure set points lower limit P1(GB7512-2006 require low pressure be 0.05MPa, high pressure is 2.5MPa) time, carry out sealing detection, pressure transducer records first pressure value P2, and pressurize certain hour setting value T2(can be arranged), pressure transducer records second pressure value P3 again, calculates amount of leakage Δ P=P2-P3.Amount of leakage P4(is allowed to arrange testing result and liquefied petroleum gas cylinder valve) compare, as Δ P≤P4, obtain liquefied petroleum gas cylinder valve and seal qualified testing result, as Δ P > P4, obtain liquefied petroleum gas cylinder valve and seal underproof testing result.When closedown supply air line, through one stabilization time setting value T1(can arrange), pressure transducer records pressure and requires that low pressure is 0.05MPa lower than pressure set points lower limit P1(GB7512-2006, and high pressure is 2.5MPa) time, obtain liquefied petroleum gas cylinder valve and seal underproof testing result.
Pick-up unit of the present invention comprises monitor station, is arranged on side plugging mechanism, electric-control system, inflating and exhausting system for the valve holder of fixing liquefied petroleum gas cylinder valve, the shutoff liquefied petroleum gas cylinder valve outlet be arranged on monitor station on monitor station, be with the difference of existing inflation pressurize cylinder valve pick-up unit: in the plugging mechanism of side, export in the side seal sprue docked the air-filled pore having and pass to gas port that cylinder valve exports and connecting test source of the gas with cylinder valve, at side seal sprue built with moveable gas port import shutoff axle, the import of gas port is on the end face of shutoff axle mounting hole, the outlet of air-filled pore is on the side of shutoff axle mounting hole, and meet shutoff axle recess gas port after gas port be communicated with through shutoff axle mounting hole with air-filled pore, there is packing washer the holding end that side seal sprue exports with cylinder valve, block head is installed in the holding end of shutoff axle and gas port, on monitor station, installation side plugging block moves cylinder and shutoff axle moves cylinder, inflating and exhausting system comprises inflation stop valve on the gas-filled tube of the air-filled pore import in connection side plugging block, gas-filled tube, is connected to the gas outlet on gas-filled tube between inflation stop valve and the import of side seal sprue air-filled pore, the discharge line valve on gas outlet, electric-control system comprises PLC, the pressure transducer be arranged on side seal sprue, side seal sprue move cylinder Controlling solenoid valve, shutoff axle moves cylinder Controlling solenoid valve, the Controlling solenoid valve of the stop valve of inflating and exhausting system, testing result display, and pressure transducer operating air pressure input hole is wherein communicated with on gas port.
The present invention be based on: whether liquefied petroleum gas cylinder valve valve place only tests closure state has leakage, the object of opening is to test O type circle and whether sealing gasket leaks, and liquefied petroleum gas cylinder valve is closing and is opening in two states, the sealing gasket state consistency that O type circle between valve rod with bonnet and valve rod, bonnet and valve body contact, only need detect O type circle and the sealing gasket sealing property of a kind of state of closure or openness, get final product the sealing property of qualitative another kind of state.
The invention has the beneficial effects as follows needing to open valve in the past, connect source of the gas, inflation, closedown source of the gas, pressurize measurement, comparison obtain result, test gas of draining, again valve-off, connect source of the gas, inflation, closedown source of the gas, pressurize measurement, comparison obtain result, two step mixed gas air-sensitive detection methods of multiple links such as test gas of draining, be simplified to only have and connect source of the gas, inflation, pressurize measurement, calculating comparison result, and be a step pressure detection method of test gas with pressurized air.Reduce detection time greatly, simplify detecting step, reduce testing cost, improve detection efficiency, especially for requiring 100% detected safety product, its efficiency improves significantly.
Accompanying drawing explanation
Fig. 1 is liquefied petroleum gas cylinder valve air-tightness detection device one-piece construction schematic diagram.
Embodiment
1, pick-up unit is arranged
Consult Fig. 1, pick-up unit of the present invention comprises monitor station (frame), is arranged on side plugging mechanism, electric-control system, inflating and exhausting system for the valve holder 2 of fixing liquefied petroleum gas cylinder valve 1, the shutoff liquefied petroleum gas cylinder valve outlet be arranged on stand on monitor station, export in the side seal sprue 3 docked the air-filled pore 9 having and pass to gas port 5 that cylinder valve exports and connecting test source of the gas with cylinder valve in the plugging mechanism of side, at side seal sprue 3 built with moveable gas port import shutoff axle 6, the import of gas port 5 is on the end face of shutoff axle mounting hole, the outlet of air-filled pore 9 is on the side of shutoff axle mounting hole, and meet shutoff axle and recess gas port 5 after gas port 5 and be communicated with through shutoff axle mounting hole with air-filled pore 9, on monitor station, installation side plugging block moves cylinder 10 and shutoff axle moves cylinder 11, there is packing washer 4 holding end that side seal sprue 3 and cylinder valve export, shutoff axle 6 installs block head 7 with the holding end of gas port, inflating and exhausting system comprises inflation stop valve 15 on the gas-filled tube 14 of air-filled pore 9 import in connection side plugging block, gas-filled tube, is connected to the gas outlet between inflation stop valve 15 and air-filled pore 9 import on gas-filled tube 14, the discharge line valve 16 on gas outlet, electric-control system comprises PLC, the pressure transducer 8 be arranged on side seal sprue, side seal sprue move cylinder Controlling solenoid valve 12, shutoff axle moves cylinder Controlling solenoid valve 13, Controlling solenoid valve 17, the Controlling solenoid valve 18 of discharge line valve 16, the testing result display screen 19 of inflation stop valve 15, and pressure transducer operating air pressure input hole is communicated with on gas port 5.
2, cylinder valve detects
Consult Fig. 1, get the YSQ-3 type liquefied petroleum gas cylinder valve 1 being in closure state, be fastened on after on valve holder 2, cylinder 10 action, side seal sprue 3 shutoff liquefied petroleum gas cylinder valve 1 exports, under the state that gas port 5 is communicated with air-filled pore 9, stop valve 15 is opened, be filled with test gas, when pressure transducer records pressure P 1, to reach setting value high pressure 2.5MPa≤P1≤3MPa(low pressure be 0.05MPa≤P1≤0.1MPa) time, cylinder 11 action, gas port shutoff axle 6 shutoff gas port 5, cut off gas port 5 and air-filled pore 9, gas port 5 and liquefied petroleum gas cylinder valve exit form closed test chamber, stop valve 15 is closed, stop valve 16 is opened, can arrange through setting value T1(stabilization time of a setting), when pressure transducer 8 record pressure be not less than pressure set points 2.5MPa(GB7512-2006 require high pressure be 2.5MPa, low pressure is 0.05Mpa) time, carry out sealing detection, pressure transducer 8 records first pressure value P2, pressurize certain hour setting value T2(can be arranged), pressure transducer 8 records second pressure value P3 again, calculate amount of leakage Δ P=P2-P3.Amount of leakage P4(is allowed to arrange according to testing result and liquefied petroleum gas cylinder valve) compare, as Δ P≤P4, show liquefied petroleum gas cylinder valve on a display screen and seal qualified testing result, as Δ P > P4, display liquefied petroleum gas cylinder valve seals underproof testing result.When gas port shutoff axle 6 shutoff gas port, cut off gas port 5 and air-filled pore 9, gas port 5 and liquefied petroleum gas cylinder valve exit form closed test chamber, stop valve 15 is closed, stop valve 16 is opened, through one stabilization time setting value T1(can arrange), it is 0.05MPa that pressure transducer 8 records pressure lower than pressure set points high pressure 2.5MPa(low pressure) time, display liquefied petroleum gas cylinder valve seal underproof testing result.
Claims (1)
1. one kind seals the pick-up unit of a step detection for liquefied petroleum gas cylinder valve high-low pressure, comprise monitor station, be arranged on the valve holder for fixing liquefied petroleum gas cylinder valve on monitor station, be slidably mounted on the side plugging mechanism of the shutoff liquefied petroleum gas cylinder valve outlet on monitor station, electric-control system, inflating and exhausting system, it is characterized in that: in the plugging mechanism of side, export in the side seal sprue docked the air-filled pore having and pass to gas port that liquefied petroleum gas cylinder valve exports and connecting test source of the gas with liquefied petroleum gas cylinder valve, at side seal sprue built with moveable gas port import shutoff axle, the import of gas port is on the end face of shutoff axle mounting hole, the outlet of air-filled pore is on the side of shutoff axle mounting hole, and meet shutoff axle recess gas port after gas port be communicated with through shutoff axle mounting hole with air-filled pore, there is packing washer the holding end that side seal sprue exports with liquefied petroleum gas cylinder valve, block head is installed in the holding end of shutoff axle and gas port, on monitor station, installation side plugging block moves cylinder and shutoff axle moves cylinder, inflating and exhausting system comprises inflation stop valve on the gas-filled tube of the air-filled pore import in connection side plugging block, gas-filled tube, is connected to the gas outlet on gas-filled tube between inflation stop valve and the import of side seal sprue air-filled pore, the discharge line valve on gas outlet, electric-control system comprises PLC, the pressure transducer be arranged on side seal sprue, side seal sprue move cylinder Controlling solenoid valve, shutoff axle moves cylinder Controlling solenoid valve, the stop valve Controlling solenoid valve of inflating and exhausting system, testing result display, and pressure transducer operating air pressure input hole is wherein communicated with on gas port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210489937.0A CN102928183B (en) | 2012-11-27 | 2012-11-27 | Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210489937.0A CN102928183B (en) | 2012-11-27 | 2012-11-27 | Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit |
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| CN102928183A CN102928183A (en) | 2013-02-13 |
| CN102928183B true CN102928183B (en) | 2015-12-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105372025B (en) * | 2015-11-27 | 2018-07-06 | 深圳市招科智控科技有限公司 | A kind of airtight testboard of hydraulic valve |
| CN105444968B (en) * | 2015-12-28 | 2019-01-11 | 苏州赛腾精密电子股份有限公司 | A kind of airtight pressure maintaining test equipment |
| CN105628313A (en) * | 2015-12-30 | 2016-06-01 | 慈溪市天行电器有限公司 | Gas electromagnetic valve automatic actuation performance and leakage test method |
| CN109238586B (en) * | 2018-11-20 | 2023-12-01 | 汇德新创（天津）科技有限公司 | Device and method for detecting missing welding of welding spots of through hole of printed circuit board |
| CN113654743B (en) * | 2021-06-30 | 2024-05-28 | 眉山中车制动科技股份有限公司 | Main valve midbody gas tightness detecting system |
| CN114199493B (en) * | 2021-10-28 | 2024-04-26 | 武汉船用机械有限责任公司 | Cylinder impact test device and test method |
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| CA2904289C (en) * | 2008-08-15 | 2017-01-10 | Securus, Inc. | Pressure testing method and apparatus |
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Patent Citations (6)
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