CN102928183A - High-low-pressure sealed one-step detecting method and detecting device of liquefied petroleum gas cylinder valve - Google Patents
High-low-pressure sealed one-step detecting method and detecting device of liquefied petroleum gas cylinder valve Download PDFInfo
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- CN102928183A CN102928183A CN2012104899370A CN201210489937A CN102928183A CN 102928183 A CN102928183 A CN 102928183A CN 2012104899370 A CN2012104899370 A CN 2012104899370A CN 201210489937 A CN201210489937 A CN 201210489937A CN 102928183 A CN102928183 A CN 102928183A
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Abstract
The invention discloses a high-low-pressure sealed one-step detecting method and detecting device of a liquefied petroleum gas cylinder valve, and belongs to the field of measurement. The defects that a conventional testing method has a plurality of steps, low efficiency and high cost are overcome. The method comprises the following steps of: filling a testing gas through an outlet at the state that the cylinder valve is closed; sealing a gas path after achieving a set value so as to form a sealed cavity; measuring the change of the gas pressure in the sealed cavity within set time; and furthermore comparing the change with an allowable change value so as to obtain the result that whether the change is qualified or not. The detecting device is characterized in that a gas guide hole which leads to the cylinder valve outlet and a gas filling hole which connected with a testing gas source are arranged in a side sealing blocking piece in butt joint with the cylinder valve outlet; a movable gas guide hole blocking shaft is installed inside the side blocking piece; and after the blocking shaft withdraws from the gas guide hole, the gas guide hole is communicated with the gas filling hole through a blocking shaft installing hole. A PLC (Programmable Logic Controller) is communicated with a pressure sensor signal of the gas guide hole, controls the operation of the detecting device and displaying the result. A one-step detecting method for detecting the sealing capability of the cylinder valve in a mode that compressed air is used as the testing gas is realized. Compared with the conventional gas pressure detecting method, the step is simplified, the efficiency is improved, and the cost is reduced.
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 manufacturer of liquefied petroleum gas cylinder valve following two kinds of methods commonly used were carried out the high-low pressure sealing property to liquefied petroleum gas cylinder valve and detected in the past: it 1 is according to GB 7512-2006 " liquefied petroleum gas cylinder valve ", adopt water cannot detect the impermeability of liquefied petroleum gas cylinder valve, namely adopt manual mode that liquefied petroleum gas cylinder valve is screwed respectively to the closure or openness state, put into water after being full of air, whether have Bubble formation, produce the degree of how much judging leakage of bubble by certain hour if observing.This detection method advantage is simple to operate, does not need the higher technology of operating personnel, with the naked eye just can determine the particular location of leakage; Shortcoming is to be affected by human factors, and manual operation error is larger, can't carry out quantitative analysis to leakage, can't realize the production automation, and production efficiency is low, and testing cost is high, and operator's hand need be immersed in the water for a long time, neither also wound body of science;
It 2 is that the method that adopts gas sensor to detect gas concentration detects the liquefied petroleum gas cylinder valve sealing property, test gas adopts the mixed air that is comprised of hydrogen and nitrogen, liquefied petroleum gas cylinder valve is in respectively under the opening and closing two states finishes the detection of high-low pressure sealing property at the monitor station of opening and closing respectively.The liquefied petroleum gas cylinder valve that at first will be in opening in the operating process is placed on the liquefied petroleum gas cylinder valve opening low pressure seal monitor station, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and the outlet, be filled with the combination gas that is formed by hydrogen and nitrogen from its import, behind the pressurize certain hour, detect hydrogen such as gas sensor, liquefied petroleum gas cylinder valve seal gasket or O type circle poor sealing are described, leakage is arranged, otherwise then without revealing; The liquefied petroleum gas cylinder valve that will be in again afterwards opening is placed on the liquefied petroleum gas cylinder valve opening high pressure sealing monitor station, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and the outlet, be filled with the combination gas that is formed by hydrogen and nitrogen from its import, behind the pressurize certain hour, detect hydrogen such as gas sensor, liquefied petroleum gas cylinder valve seal gasket or O type circle poor sealing are described, leakage is arranged, otherwise then without revealing; With certain moment of torsion it is closed screwing worktable under opening, detecting qualified liquefied petroleum gas cylinder valve more afterwards, be placed on again on the liquefied petroleum gas cylinder valve closure state high pressure sealing monitor station, after the import of equipment automatic plugging liquefied petroleum gas cylinder valve and the outlet, be filled with the combination gas that is formed by hydrogen and nitrogen from its import, behind the pressurize certain hour, detect hydrogen such as gas sensor, valve and the valve body surface of contact poor sealing of liquefied petroleum gas cylinder valve are described, leakage is arranged, otherwise then without revealing.
Obviously, although detecting the method for gas concentration, gas sensor can carry out quantitative analysis to leakage, and can realize the production automation, but the greatest problem that exists is the detection with liquefied petroleum gas cylinder valve to be divided into the opening and closing two states and to finish step by step, the each detection of gas sensor also needs stabilization time of growing after finishing when detecting simultaneously, the serviceable life of gas sensor is shorter again, and adopting again the combination gas that is comprised of hydrogen and nitrogen is test gas, not only the running program complexity is loaded down with trivial details for this, inefficiency, and waste time and energy, the checkout equipment investment is large, and testing cost is high.
Summary of the invention
Purpose of the present invention just provides a kind of one step of liquefied petroleum gas cylinder valve high-low pressure sealing detection method, only be in closed state at liquefied petroleum gas cylinder valve and finish high pressure or low pressure seal Performance Detection next time, 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 is to provide 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, be filled with test gas from the liquefied petroleum gas cylinder valve exit, after the accurate range of set value up to standard, the shutoff gas circuit, form the test chamber of sealing, measure air pressure change in setting-up time inner sealing test chamber with the pressure transducer that is communicated with test chamber, will change numerical value and standard permission changing value and compare, must be whether qualified testing result; Collection and the calculation procedure of pressure reading are: after the shutoff gas circuit, setting value T1(stabilization time through a setting can arrange), be not less than pressure set points lower limit P1(GB 7512-2006 to require low pressure be 0.05MPa when pressure transducer records pressure, high pressure is 2.5MPa) time, carry out sealing detection, pressure transducer records first pressure value P2, pressurize certain hour setting value T2(can arrange), pressure transducer records second pressure value P3 again, calculates amount of leakage Δ P=P2-P3.Allow amount of leakage P4(to arrange testing result and liquefied petroleum gas cylinder valve) relatively, such as Δ P≤P4, get the qualified testing result of liquefied petroleum gas cylinder valve sealing, such as Δ P＞P4, get liquefied petroleum gas cylinder valve and seal underproof testing result.When closing supply air line, through one stabilization time setting value T1(can arrange), pressure transducer records pressure and is lower than pressure set points lower limit P1(GB 7512-2006 to require low pressure be 0.05MPa, and high pressure is 2.5MPa) time, get liquefied petroleum gas cylinder valve and seal underproof testing result.
Pick-up unit of the present invention comprises monitor station, is installed on the monitor station valve holder that is used for fixing liquefied petroleum gas cylinder valve, the side seal that is installed in the shutoff liquefied petroleum gas cylinder valve outlet on the monitor station blocks up mechanism, electric-control system, inflating and exhausting system; Be with the difference of existing inflation pressurize cylinder valve pick-up unit: have in the side seal sprue that dock with the cylinder valve outlet in the stifled mechanism of side seal and pass to gas port that cylinder valve exports and the air-filled pore of connecting test source of the gas, movably gas port import shutoff axle is housed in the side seal sprue, 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 gas port is communicated with through shutoff axle mounting hole with air-filled pore after satisfying the shutoff axle and recessing gas port, there is packing washer holding end with the cylinder valve outlet on the side seal sprue, block head is installed in the holding end of shutoff axle and gas port, and the installation side plugging block moves cylinder and the shutoff axle moves cylinder on the monitor station; Inflating and exhausting system comprises the gas-filled tube, the inflation stop valve on the gas-filled tube that connect the air-filled pore import on the side seal sprue, is connected to the gas outlet on the gas-filled tube between inflation stop valve and the import of side seal sprue air-filled pore, the discharge line valve on the gas outlet; Electric-control system comprises PLC, be installed in pressure transducer, side seal sprue on the side seal sprue moves control solenoid valve, the testing result display that cylinder control solenoid valve, shutoff axle move the stop valve of cylinder control solenoid valve, inflating and exhausting system, and pressure transducer operating air pressure input hole wherein is communicated with on gas port.
The present invention is based on: whether liquefied petroleum gas cylinder valve valve place only tests closure state leakage, whether the purpose of opening is to leak in order to test O type circle and sealing gasket, and liquefied petroleum gas cylinder valve is in closed and unlatching two states, the contacted sealing gasket state consistency of O type circle between valve rod and the bonnet and valve rod, bonnet and valve body, 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 will need to open valve in the past, connect source of the gas, inflate, close source of the gas, pressurize is measured, compare result, the test gas of draining, again valve-off, connect source of the gas, inflate, close source of the gas, pressurize is measured, compare to get two step mixed gas air-sensitive detection methods of a plurality of links such as result, the test gas of draining, be simplified to and only have connection source of the gas, inflation, pressurize to measure, calculate comparison result, and the step pressure detection method take pressurized air as test gas.Reduced detection time greatly, simplified detecting step, reduced testing cost, improved detection efficiency, especially for requiring 100% detected safety product, its efficient improves significantly.
Description of drawings
Fig. 1 is liquefied petroleum gas cylinder valve air-tightness detection device one-piece construction schematic diagram.
Embodiment
1, pick-up unit setting
Consult Fig. 1, pick-up unit of the present invention comprises monitor station (frame), is installed on the monitor station valve holder 2 that is used for fixing liquefied petroleum gas cylinder valve 1, the side seal that is installed in the shutoff liquefied petroleum gas cylinder valve outlet on the stand blocks up mechanism, electric-control system, inflating and exhausting system; Have in the side seal sprue 3 that dock with the cylinder valve outlet in the stifled mechanism of side seal and pass to gas port 5 that cylinder valve exports and the air-filled pore 9 of connecting test source of the gas, movably gas port import shutoff axle 6 is housed in side seal sprue 3, 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 satisfy the shutoff axle and recess gas port 5 rear gas ports 5 and be communicated with through shutoff axle mounting hole with air-filled pore 9, the installation side plugging block moves cylinder 10 and the shutoff axle moves cylinder 11 on the monitor station, side seal sprue 3 has packing washer 4 with the holding end of cylinder valve outlet, and shutoff axle 6 is installed block head 7 with the holding end of gas port; Inflating and exhausting system comprises the gas-filled tube 14, the inflation stop valve 15 on the gas-filled tube that connect air-filled pore 9 imports on the side seal sprue, is connected to gas outlet, the discharge line valve on the gas outlet 16 on the gas-filled tube 14 between inflation stop valve 15 and air-filled pore 9 imports; Electric-control system comprises PLC, be installed in pressure transducer 8, side seal sprue on the side seal sprue moves control solenoid valve 17, the control solenoid valve 18 of discharge line valve 16, the testing result display screen 19 that cylinder control solenoid valve 12, shutoff axle move cylinder control solenoid valve 13, 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 that is in closure state, after being fastened on it on valve holder 2, cylinder 10 actions, 1 outlet of side seal sprue 3 shutoff liquefied petroleum gas cylinder valves, under the state of gas port 5 and air-filled pore 9 connections, 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 is 0.05MPa≤P1≤0.1MPa), cylinder 11 actions, gas port shutoff axle 6 shutoff gas ports 5, cut off gas port 5 and air-filled pore 9, gas port 5 forms the closed test chamber with the liquefied petroleum gas cylinder valve exit, stop valve 15 is closed, stop valve 16 is opened, setting value T1(stabilization time through a setting can arrange), be not less than pressure set points 2.5MPa(GB 7512-2006 to require high pressure be 2.5MPa when pressure transducer 8 records pressure, low pressure is 0.05Mpa) time, carry out sealing detection, pressure transducer 8 records first pressure value P2, and pressurize certain hour setting value T2(can arrange), pressure transducer 8 records second pressure value P3 again, calculates amount of leakage Δ P=P2-P3.Allow amount of leakage P4(to arrange according to testing result and liquefied petroleum gas cylinder valve) relatively, such as Δ P≤P4, showing that the screen display liquefied petroleum gas cylinder valve seals qualified testing result, such as Δ P＞P4, show that liquefied petroleum gas cylinder valve seals underproof testing result.When gas port shutoff axle 6 shutoff gas ports, cut off gas port 5 and air-filled pore 9, gas port 5 forms the closed test chamber with the liquefied petroleum gas cylinder valve exit, stop valve 15 is closed, stop valve 16 is opened, through one stabilization time setting value T1(can arrange), pressure transducer 8 records pressure, and to be lower than pressure set points high pressure 2.5MPa(low pressure be 0.05MPa) time, show that liquefied petroleum gas cylinder valve seals underproof testing result.
Claims (2)
1. liquefied petroleum gas cylinder valve high-low pressure hermetization testing method, it is characterized in that: under liquefied petroleum gas cylinder valve is in closure state, be filled with test gas from the liquefied petroleum gas cylinder valve exit, after the accurate range of set value up to standard, the shutoff gas circuit forms the test chamber that seals, and uses the air pressure change of pressure-detecting device measurement in setting-up time inner sealing test chamber that is communicated with test chamber, to change numerical value and standard and allow changing value to compare, qualified testing result whether; Collection and the calculation procedure of pressure reading are: after the shutoff gas circuit, setting value T1 stabilization time through a setting, when recording pressure, pressure transducer is not less than under the pressure set points in limited time, carry out sealing detection, pressure transducer records first pressure value P2, pressurize certain hour setting value T2, pressure transducer records second pressure value P3 again, calculates amount of leakage Δ P=P2-P3; Liquefied petroleum gas cylinder valve according to testing result and setting allows amount of leakage P4 relatively, such as Δ P≤P4, gets the qualified testing result of liquefied petroleum gas cylinder valve sealing, such as Δ P＞P4, gets liquefied petroleum gas cylinder valve and seals underproof testing result; Or close supply air line, through setting one stabilization time setting value T1, pressure transducer records pressure and is lower than under the force value that standard GB/T 7512-2006 sets in limited time, gets liquefied petroleum gas cylinder valve and seals underproof testing result.
2. one kind is used for the pick-up unit that liquefied petroleum gas cylinder valve high-low pressure sealing one claimed in claim 1 goes on foot detection method, comprise monitor station, be installed in and be used for the fixedly valve holder of liquefied petroleum gas cylinder valve on the monitor station, be slidingly mounted on the stifled mechanism of side seal of the shutoff liquefied petroleum gas cylinder valve outlet on the monitor station, electric-control system, inflating and exhausting system, it is characterized in that: have in the side seal sprue that dock with the cylinder valve outlet in the stifled mechanism of side seal and pass to gas port that cylinder valve exports and the air-filled pore of connecting test source of the gas, movably gas port import shutoff axle is housed in the side seal sprue, 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 gas port is communicated with through shutoff axle mounting hole with air-filled pore after satisfying the shutoff axle and recessing gas port, there is packing washer holding end with the cylinder valve outlet on the side seal sprue, block head is installed in the holding end of shutoff axle and gas port, and the installation side plugging block moves cylinder and the shutoff axle moves cylinder on the monitor station; Inflating and exhausting system comprises the gas-filled tube, the inflation stop valve on the gas-filled tube that connect the air-filled pore import on the side seal sprue, is connected to the gas outlet on the gas-filled tube between inflation stop valve and the import of side seal sprue air-filled pore, the discharge line valve on the gas outlet; Electric-control system comprises PLC, be installed in pressure transducer, side seal sprue on the side seal sprue moves control solenoid valve, the testing result display that cylinder control solenoid valve, shutoff axle move the stop valve of cylinder control solenoid valve, inflating and exhausting system, and pressure transducer operating air pressure input hole wherein is 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 true CN102928183A (en) | 2013-02-13 |
| CN102928183B CN102928183B (en) | 2015-12-23 |
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| CN105372025A (en) * | 2015-11-27 | 2016-03-02 | 深圳市招科智控科技有限公司 | Gas tight test board of hydraulic valve |
| CN105444968A (en) * | 2015-12-28 | 2016-03-30 | 苏州赛腾精密电子股份有限公司 | Air tightness pressure-maintaining test apparatus |
| 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 |
| CN109238586A (en) * | 2018-11-20 | 2019-01-18 | 汇德新创（天津）科技有限公司 | A kind of printed circuit board through-hole solder joint leak inductance device and detection method |
| CN113654743A (en) * | 2021-06-30 | 2021-11-16 | 眉山中车制动科技股份有限公司 | Main valve middle body air tightness detection system |
| CN114199493A (en) * | 2021-10-28 | 2022-03-18 | 武汉船用机械有限责任公司 | Cylinder impact test device and test method |
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| 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 |
| CN114199493A (en) * | 2021-10-28 | 2022-03-18 | 武汉船用机械有限责任公司 | Cylinder impact test device and test method |
| 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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Granted publication date: 20151223 Termination date: 20161127 |