CN105181251A - Pulse segmented pressure testing device and pressure testing method - Google Patents
Pulse segmented pressure testing device and pressure testing method Download PDFInfo
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- CN105181251A CN105181251A CN201510608354.9A CN201510608354A CN105181251A CN 105181251 A CN105181251 A CN 105181251A CN 201510608354 A CN201510608354 A CN 201510608354A CN 105181251 A CN105181251 A CN 105181251A
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Abstract
The present invention relates to a pulse segmented pressure testing device and a pressure testing method. The pressure testing device comprises two core nozzles, and the two ends of a to-be-tested pipeline match the two core nozzles respectively. One of the core nozzles is installed on an exhaust air duct, and the exhaust air duct is equipped with an exhaust valve. The other one core nozzle is installed on a main pipeline, the main pipeline is equipped with a pressure detection device, a main pipeline valve and a main water tank, and a low pressure water injection pump, a high pressure pump, a pump end valve and an unloading valve are arranged between the pressure detection device and the main pipeline valve. The pressure testing method comprises the steps of installing the to-be-tested pipeline, injecting water, maintaining pressure, determining results, etc. According to the present invention, the fine defects on the to-be-tested rubber pipes that can not be discovered by a one-segment type hydrostatic pressure testing method, can be discovered, and the rubber pipes with the defects are prevented from being used by the clients, thereby substantially reducing the phenomena, such as the leakage, the pipe explosion, etc.
Description
Technical field
The present invention relates to pipeline quality detection technique field, specifically a kind of pulse segment formula pressure testing device and pressure-measuring method, the finished product sebific duct be particularly useful for having produced carries out defect inspection to sebific duct before dispatching from the factory.
Background technology
Hydralic hose assembly is the original basic part in Hydraulic Power Transmission System, the direct influential system of quality of hose assembly quality and the usability of main frame, in real work, often there is sebific duct explosion, sebific duct sand holes revealed, sebific duct and joint pull-off, interior coupling part occur to rupture and hose assembly withhold at the beginning of the failure mode such as to reveal, cause main frame and the system failure, the serious accident of personal injury even occurs.So before hydralic hose assembly uses, in order to ensure product quality, guaranteeing assembly use safety, pressure testing test be carried out.
Carry out pressure testing test to hose assembly, this is also the project that factory inspection must be examined, and pressure testing tentatively can judge whether whether hose assembly meets the requirement of working pressure, reach the requirement of safety in production in actual use.
The pressure testing mode generally adopted at present is the hydrostatic pressure testing method of one-part form, and namely sebific duct is applied to working pressure, the pressure testing three minutes of 2 times, by checking whether sebific duct has pressure drop, if voltage drop value is within the scope of required standard, then sebific duct is qualified.The harsh producer of part is by increasing the pressure testing time as 5 minutes, 10 minutes, or the working pressure of increase pressure test pressure as 2.5 times is strengthened sebific duct sand holes defects controlling.But no matter be increase the pressure testing time or increase pressure test pressure, all adopt traditional hydrostatic pressure testing mode of one-part form, namely according to hydrostatic pressure experiment principle, by remote microcomputer Systematical control, water filling boosting is carried out to pipeline, allows overpressure reach enterprise requirements pressure, pressure testing Time constant, observe sebific duct whether to have and to reveal and force value changes, thus assess sebific duct whether defectiveness.Research at present for pressure testing device is also mostly based upon on the basis of the hydrostatic pressure testing method of one-part form.
The hydrostatic pressure testing ratio juris of one-part form is for when exerting pressure to sebific duct, and strutted in place weak on sebific duct wall in sebific duct, current flow out from weak place, and hydraulic pressure declines, and sebific duct is revealed, thus finds sebific duct defect, stops defect sebific duct and flows into client.Traditional one-part form hydrostatic pressure testing method can only find that some are larger with general defect, as interior glue serious loss, separant sand holes, interior glue seriously catches up with glue etc., the defect small for some or special defect, as the overlapping line of glue caught up with by interior glue, interior glue reverses overlapping line, plug line line etc., when pressure testing method hydrostatic to these small defects applying one-part form, the effect of being under pressure, it is tighter that the part of sebific duct defect overlap can close, current cannot flow out from defect part, do not observe leakage and pressure drop, so can't find these small defects, bad sebific duct is caused to flow into client.Some sebific ducts with tiny flaw will be caused like this to enter in client's hand, client in use, may in earlier stage can't find, but after using a period of time, just there will be leakage, booster phenomenon, not only cause damage to client, bring danger, also harmful effect is brought to the prestige of sebific duct manufacturing enterprise.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of pulse segment formula pressure testing device and pressure-measuring method, this pressure testing device and pressure-measuring method can realize the pressure testing of pulse segment formula, in continuous several times boosting, step-down, boost again, in the process of step-down again, small and special crackle, sand holes etc. are made to have the chance of folding, thus the situation of leakage or pressure drop is there is in pressure testing process, find these trickle defects.
The technical scheme that the present invention solves its technical matters is: a kind of pulse segment formula pressure testing device, and comprising two for loading the core mouth of pipe under test, matches with two core mouths respectively in the two ends of pipe under test; One of them core mouth is arranged on gas exhaust duct, gas exhaust duct is provided with vent valve, another core mouth is arranged on main pipeline, and main pipeline is provided with the main water box for supplying water to pipe under test away from one end of core mouth, main pipeline is also provided with pressure-detecting device and main pipeline valve; Be provided with low pressure water injection pump, high-pressure pump, pump end valve and unloader between pressure-detecting device and main pipeline valve, low pressure water injection pump, high-pressure pump, pump end valve and unloader lay respectively on the different arms of main pipeline; Pump end valve is for unloading the excess pressure in high-pressure pump, and unloader is used for for pipe under test pressure release.
Described high-pressure pump and low pressure water injection pump all adopt variable frequency control, and frequency is between 0 ~ 50Hz, and described pressure-detecting device adopts pressure unit.
Further technical scheme is: described vent valve, pressure-detecting device, main pipeline valve, low pressure water injection pump, high-pressure pump, pump end valve and unloader are all connected with a PLC.After arranging PLC, can realize automatic control, after operating personnel set parameters, system can carry out pressurize automatically, and releasing pressure automatically after pressurize completes, saves manpower, and efficiency is higher, obtains result and also more accurately facilitates.PLC also can arrange Non-follow control and automatically control two patterns, its pressurize switch can arrange manual, automatic two gears, when manual gear got to by pressurize switch, be MANUAL CONTROL mode, each valve in pressure maintaining period and the operation of pump all need operating personnel oneself to control; When automatic gear got to by pressurize switch, be automatic control mode, after operating personnel set parameters, system can automatically be carried out pressurize and record result, releasing pressure automatically after completing to pressurize.
Further technical scheme for: the arm residing for described low pressure water injection pump is also provided with the first arm valve, the first filtrator and the first high pressure check valve.First arm valve is arranged on the one end near described main pipeline valve, and the first filtrator is arranged between the first arm valve and low pressure water injection pump, and the first high pressure check valve is arranged on the one end near described pressure-detecting device.
Arm residing for described high-pressure pump is also provided with the second arm valve, the second filtrator and the second high pressure check valve.Second arm valve is arranged on the one end near described main pipeline valve, and the second filtrator is arranged between the second arm valve and high-pressure pump, and the second high pressure check valve is arranged on the one end near described pressure-detecting device.
Further technical scheme for: be provided with between the arm residing for described pump end valve and the arm residing for described unloader third high pressure retaining valve.When pipe under test pressure release, unloader is opened, and third high pressure retaining valve can ensure that pressure is drained smoothly from the arm residing for unloader, avoids it to enter other arms, improves the efficiency of pressure release.
Further technical scheme is: described core mouth place is provided with pipe under test stationary installation.Pipe under test stationary installation is fixed further by between the two ends of pipe under test and core mouth, effectively avoids pipe under test in pressure maintaining period, occur pull-off phenomenon.
Further technical scheme is: described core mouth comprises the main body of tubulose, one end of main body is provided with external thread and is connected by screw thread with described gas exhaust duct or main pipeline, external thread is provided with one for placing the deep gouge of O-ring seal near one end of described pipe under test, described deep gouge ringwise.
Due to when different sebific duct pressurizes, the core mouth adopted is different, so, core mouth just requires frequent dismounting, core mouth adopts to be threaded is convenient to mounting or dismounting, is provided with a deep gouge, places an O type circle so inside and seal at the screw thread place of core mouth, by adopting soft seal to replace hard sealing, thus improve the serviceable life of core mouth.
Further technical scheme is: described pipe under test stationary installation comprise symmetrically arranged folder lobe and for drive folder lobe hydraulic chuck, folder lobe is positioned at the outside of described core mouth and core mouth and pipe under test is clamped, core mouth is provided with the boss of annular with the cooperation place of folder lobe, and the surface that folder lobe matches with core mouth is provided with the ring groove matched with described boss.
In pressure maintaining period, sebific duct is sometimes because of some fortuitous event, such as say, accident power-off causes insufficient clamping force, clamping force is excessive in other words causes the situations such as sebific duct pinch off, and in pressure maintaining period, there is sebific duct pull-off phenomenon, in order to ensure when sebific duct pull-off, core mouth can not fly out and hurt sb.'s feelings, the structure of core mouth devises a boss, folder lobe devises a ring groove, like this in pressure maintaining period, by the cooperation of boss and ring groove, core mouth has just well been limited on folder lobe, substantially increases security.
The technical scheme that the present invention solves its technical matters also comprises: a kind of pulse segment formula pressure-measuring method, comprises the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test on two core mouths respectively, promotes folder lobe by hydraulic chuck and pipe under test is fixed on core mouth.
Step (2): water filling: by exhaust valve opening, pump end valve and unloader are closed, open low pressure water injection pump to water filling in pipe under test, to be seen when there are flowing out in vent valve, closing vent valve and low pressure water injection pump, detecting pipe under test with or without leaking, leak if occur, then pipe under test is judged to defective, if without leaking, then performs step (3) to pipe under test.
Step (3): boosting: pump end valve, unloader and vent valve are all closed, opening high-pressure pump makes pressure in pipe under test raise, after in pipe under test, pressure is increased to pressure test pressure setting value, high-pressure pump cuts out, while high-pressure pump closedown, pump end valve is opened, and discharge degree unnecessary in high-pressure pump is fallen.
Step (4): pressurize: keep the force value in pipe under test to be the pressure testing time of pressure test pressure setting value to setting.
Step (5): pressure release: after pressurize completes, opens unloader, makes pipe under test off-load.
Step (6): record pressure testing result: the voltage drop value of pipe under test in record pressure maintaining period.
Step (7): multistage pressure testing: repeat step (3) ~ step (6) repeatedly.
Step (8): result judges: when the voltage drop value of the pipe under test recorded in step (6) and step (7) is all not more than setting value, pipe under test is judged as qualified, otherwise defective.
Step (9): provide pressure testing report: have sebific duct model in pressure testing report comprises, pressure test pressure, pressure testing time, each section of voltage drop value, pressure drop scheme and conclusion etc. in real time.
The technical scheme that the present invention solves its technical matters also comprises: a kind of pulse segment formula pressure-measuring method, comprises the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test on two core mouths respectively, promotes folder lobe by hydraulic chuck and pipe under test is fixed on core mouth.
Step (2): setting pressure testing mode: for the pressurize requirement of different pipe under test, input water injection time, pressure rising time, pressure test pressure setting value and pressure testing time in the control system of PLC.
Step (3): water filling: by exhaust valve opening, pump end valve and unloader are closed, open low pressure water injection pump to water filling in pipe under test, to be seen when there are flowing out in vent valve, closing vent valve and low pressure water injection pump, detecting pipe under test with or without leaking, leak if occur, then pipe under test is judged to defective, if without leaking, then performs step (4) to pipe under test.
Step (4): automatic pressure-maintaining: after water filling completes, opens automatic pressure-maintaining by the control system in operation PLC, and automatic pressure-maintaining process is carried out repeatedly for following step (4-1) ~ step (4-3) being circulated successively:
Step (4-1): in pipe under test, pressure is increased to pressure test pressure setting value;
Step (4-2 :) keeps the force value in pipe under test to be the pressure testing time of pressure test pressure setting value to setting;
Step (4-3): make pipe under test off-load.
Step (5): result judges and preserves: described step (4-1) ~ step (4-3) often completes once, the voltage drop value that the control system of PLC shows pipe under test in this section of pressure maintaining period also ejects the button whether preserved, when operating personnel confirm that the voltage drop value of pipe under test is all not more than setting value, pipe under test is judged as qualified, selects saving result; Otherwise pipe under test is judged as defective, not saving result.
Step (6): provide pressure testing report: have sebific duct model in pressure testing report comprises, pressure test pressure, pressure testing time, each section of voltage drop value, pressure drop scheme and conclusion etc. in real time.
Further technical scheme is: described pressure test pressure setting value is 2 ~ 3 times of pipe under test working pressure, and the described pressure testing time is 3min ~ 20min.
The invention has the beneficial effects as follows:
1, a kind of pressure testing device is provided, this pressure testing device is used for the pulse segment formula pressure testing of finished product sebific duct, the continuous several times boosting required for pulse segment formula pressure-measuring method, step-down can be realized easily, boost again, the process of step-down again, can find on sebific duct small in special defect, as interior glue catch up with the overlapping line of glue, interior glue reverses overlapping line, plug line line etc., ensure that the quality of the sebific duct that dispatches from the factory, avoid the defective sebific duct of band and flow into the loss and the security incident that cause client in client's hand.
2, a kind of pressure-measuring method is provided, this pressure-measuring method repeatedly boosts continuously in pressure testing process, step-down, boost again, the process of step-down again, trickle and the special overlapping defects that some traditional one-part form hydrostatic pressure testing methods can't find, can folding in the process of " step-down, boost again ", thus the situation of leakage or pressure drop is there is in pressure testing process, find these trickle defects, avoid the defective sebific duct of band and flow into the loss and the security incident that cause client in client's hand.
3, pressure-measuring method of the present invention can also can control by Non-follow control automatically, and control mode is flexible, adapts to the needs of the different enterprise of scale and the concrete condition of production.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment of the present invention pressure testing device;
Fig. 2 is the structural representation of embodiment of the present invention pressure testing device core mouth;
Fig. 3 is the structural representation of embodiment of the present invention pressure testing device folder lobe;
Fig. 4 is the curve map of the relation in embodiment of the present invention pressure-measuring method between pressure testing time and pressure test pressure.
In figure: 1 main pipeline valve, 2 first arm valves, 3 first filtrators, 4 low pressure water injection pumps, 5 first high pressure check valve, 6 second arm valves, 7 second filtrators, 8 high-pressure pumps, 9 second high pressure check valve, 10 pump end valves, 11 unloaders, 12 third high pressure retaining valves, 13 pressure-detecting devices, 14 hydraulic chucks, 141 folder lobes, 142 ring grooves, 15 pipe under test, 16 core mouths, 161 boss, 162 deep gouges, 163 external threads, 17 vent valves.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described:
As shown in Figure 1, a kind of pulse segment formula pressure testing device, comprising two for loading the core mouth 16 of pipe under test 15, matches with two core mouths 16 respectively in the two ends of pipe under test 15; One of them core mouth is arranged on gas exhaust duct, gas exhaust duct is provided with vent valve 17, another core mouth is arranged on main pipeline, main pipeline is provided with the main water box (not shown) for supplying water to pipe under test away from one end of core mouth, main pipeline is also provided with pressure-detecting device 13 and main pipeline valve 1; Be provided with low pressure water injection pump 4, high-pressure pump 8, pump end valve 10 and unloader 11 between pressure-detecting device 13 and main pipeline valve 1, low pressure water injection pump 4, high-pressure pump 8, pump end valve 10 and unloader 11 lay respectively on the different arms of main pipeline; Pump end valve 10 is for unloading the excess pressure in high-pressure pump 8, and unloader 11 is for being pipe under test 15 pressure release.
Described pipe under test 15 is sebific duct, and described high-pressure pump 8 and low pressure water injection pump 4 all adopt variable frequency control, and frequency is between 0 ~ 50Hz, and described pressure-detecting device 13 adopts pressure unit.
Described vent valve 17, pressure-detecting device 13, main pipeline valve 1, low pressure water injection pump 4, high-pressure pump 8, pump end valve 10 and unloader 11 are all connected with a PLC (not shown).After arranging PLC, can realize automatic control, after operating personnel set parameters, system can carry out pressurize automatically, and releasing pressure automatically after pressurize completes, saves manpower, and efficiency is higher, obtains result and also more accurately facilitates.PLC also can arrange Non-follow control and automatically control two patterns, its pressurize switch can arrange manual, automatic two gears, when manual gear got to by pressurize switch, be MANUAL CONTROL mode, each valve in pressure maintaining period and the operation of pump all need operating personnel oneself to control; When automatic gear got to by pressurize switch, be automatic control mode, after operating personnel set parameters, system can automatically be carried out pressurize and record result, releasing pressure automatically after completing to pressurize.
Arm residing for described low pressure water injection pump 4 is also provided with the first arm valve 2, first filtrator 3 and the first high pressure check valve 5.First arm valve 2 is arranged on the one end near described main pipeline valve 1, and the first filtrator 3 is arranged between the first arm valve 2 and low pressure water injection pump 4, and the first high pressure check valve 5 is arranged on the one end near described pressure-detecting device 13.
Arm residing for described high-pressure pump 8 is also provided with the second arm valve 6, second filtrator 7 and the second high pressure check valve 9.Second arm valve 6 is arranged on the one end near described main pipeline valve 1, and the second filtrator 7 is arranged between the second arm valve 6 and high-pressure pump 8, and the second high pressure check valve 9 is arranged on the one end near described pressure-detecting device 13.
Arm valve is set, idle arm can be closed as required, be beneficial to the normal work of device and carrying out smoothly of pressure testing.First filtrator 3 is set and can filters out the impurity entered through low pressure water injection pump 4 in the water of pipe under test 15, not only be conducive to the serviceable life extending low pressure water injection pump 4, also avoid the impurity of larger particles in water blocked by the rejected region of sebific duct thus cause pressure testing result inaccurate.In like manner, the second filtrator 7 is set, is not only conducive to the serviceable life extending high-pressure pump 8, also avoids the impurity of larger particles in water blocked by the rejected region of sebific duct thus cause pressure testing result inaccurate.
Third high pressure retaining valve 12 is provided with between the arm residing for described pump end valve 10 and the arm residing for described unloader 11.When pipe under test 15 pressure release, unloader 11 is opened, and third high pressure retaining valve 12 can ensure that pressure is drained smoothly from the arm residing for unloader 11, avoids it to enter other arms, improves the efficiency of pressure release and is beneficial to the stable operation of device.
Described core mouth 16 place is provided with pipe under test stationary installation.Pipe under test stationary installation is fixed further by between the two ends of pipe under test 15 and core mouth 16, effectively avoids pipe under test 15 in pressure maintaining period, occur pull-off phenomenon.
As shown in Figure 2, described core mouth 16 comprises the main body of tubulose, one end of main body is provided with external thread 163 and is connected by screw thread with described gas exhaust duct or main pipeline, external thread 163 is provided with one for placing the deep gouge 162 of O-ring seal near one end of described pipe under test 15, described deep gouge 162 ringwise.
Due to when different sebific duct pressurizes, the core mouth 16 adopted is different, so, core mouth 16 just requires frequent dismounting, core mouth 16 adopts to be threaded is convenient to mounting or dismounting, is provided with a deep gouge 162, places an O type circle so inside and seal at the screw thread place of core mouth 16, by adopting soft seal to replace hard sealing, thus improve the serviceable life of core mouth 16.
Described pipe under test stationary installation comprise symmetrically arranged folder lobe 141 and for drive folder lobe 141 hydraulic chuck 14, folder lobe 141 is positioned at the outside of described core mouth 16 and core mouth 16 and pipe under test 15 is clamped, core mouth 16 is provided with the boss 161 of annular with the cooperation place of folder lobe 141, the structure of folder lobe 141 as shown in Figure 3, the surface that folder lobe 141 matches with core mouth 16 is provided with the ring groove 142 matched with described boss 161.
In pressure maintaining period, sebific duct is sometimes because of some fortuitous event, such as say, accident power-off causes insufficient clamping force, clamping force is excessive in other words causes the situations such as sebific duct pinch off, and in pressure maintaining period, there is sebific duct pull-off phenomenon, in order to ensure when sebific duct pull-off, core mouth can not fly out and hurt sb.'s feelings, the structure of core mouth 16 devises a boss 161, folder lobe 141 devises a ring groove 142, like this in pressure maintaining period, by the cooperation of boss 161 and ring groove 142, core mouth 16 has just well been limited on folder lobe 141, substantially increases security.
As shown in Figure 4, a kind of pulse segment formula pressure-measuring method, the pressure-measuring method of the present embodiment adopts three sections of pressure testing methods, in Fig. 4, W.P is WorkingPressure, i.e. working pressure, the setting value of the present embodiment pressure test pressure gets the working pressure of 2.5 times, pressure testing time tmin=5min, and the pressure-measuring method of Non-follow control comprises the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test 15 on two core mouths 16 respectively, promote folder lobe 141 by hydraulic chuck 14 and be fixed on core mouth 16 by pipe under test 15, described pipe under test 15 is sebific duct.
Step (2): water filling: vent valve 17 is opened, pump end valve 10 and unloader 11 are closed, open low pressure water injection pump 4 to water filling in pipe under test 15, such water just flows into from the core mouth main pipeline the sebific duct treating pressurize, air simultaneously in sebific duct just flows out from vent valve 17, to be seen when there are flowing out in vent valve 17, close vent valve 17 and low pressure water injection pump 4, detect pipe under test 15 with or without leaking, leak if occur, then pipe under test 15 is judged to defective, if without leaking, then perform step (3) to pipe under test 15.
Step (3): boosting: pump end valve 10, unloader 11 and vent valve 17 are all closed, opening high-pressure pump 8 makes pressure in pipe under test 15 raise, after in pipe under test 15, pressure is increased to pressure test pressure setting value, high-pressure pump 8 cuts out, while high-pressure pump 8 closedown, pump end valve 10 is opened, and discharge degree unnecessary in high-pressure pump 8 is fallen.
Step (4): pressurize: keep the force value in pipe under test 15 to be that 2.5 times of working pressures are to 5min.
Step (5): pressure release: after pressurize completes, opens unloader 11, makes pipe under test 15 off-load.
Step (6): record pressure testing result: the voltage drop value of pipe under test 15 in record pressure maintaining period.
Step (7): multistage pressure testing: repeat step (3) ~ step (6) twice.
Step (8): result judges: the value of record is as first paragraph voltage drop value in step (6), in step (7), the value of record is followed successively by second segment voltage drop value and the 3rd section of voltage drop value, consider the sebific duct effect of being under pressure, itself have the length variations of extending or shrinking, voltage drop value must have, regulation first paragraph voltage drop value is not more than 0.8Mpa, second segment voltage drop value is not more than 0.5Mpa, 3rd section of voltage drop value is not more than 0.3Mpa, if three sections all satisfied, it is qualified to be then judged as, otherwise defective.
Step (9): provide pressure testing report: have sebific duct model in pressure testing report comprises, pressure test pressure, pressure testing time, each section of voltage drop value, pressure drop scheme and conclusion etc. in real time.
The pressure-measuring method of automatic control comprises the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test 15 on two core mouths 16 respectively, promote folder lobe 141 by hydraulic chuck 14 and be fixed on core mouth 16 by pipe under test 15, described pipe under test 15 is sebific duct.
Step (2): setting pressure testing mode: for the pressurize requirement of different pipe under test, input water injection time, pressure rising time, pressure test pressure setting value and pressure testing time in the control system of PLC.
In the control system of PLC, manually can input the production information of different sebific duct, in addition, can also according to the pressurize requirement of different sebific duct, the parameter of manually some needs amendments of input.Manually can input the pressure required for wanted pressurize sebific duct, time.In order to coordinate pressure rising time and the water injection time of some large-bore hoses and chemical line, high-pressure pump and low pressure water injection pump all adopt variable frequency control, frequency is between 0-50Hz, that is the sebific duct water injection frequency that bore is large and the height that boost frequency all compares, and some small-bore sebific ducts, due to the display by bore, frequency is crossed higher position and is easy to occur that water filling is discontented with or unstable phenomenon of boosting, and therefore small-bore sebific duct water injection frequency and boost frequency should not arrange too high.
Step (3): water filling: vent valve 17 is opened, pump end valve 10 and unloader 11 are closed, open low pressure water injection pump 4 to water filling in pipe under test 15, such water just flows into from the core mouth main pipeline the sebific duct treating pressurize, air simultaneously in sebific duct just flows out from vent valve 17, to be seen when there are flowing out in vent valve 17, close vent valve 17 and low pressure water injection pump 4, detect pipe under test 15 with or without leaking, leak if occur, then pipe under test 15 is judged to defective, if without leaking, then perform step (4) to pipe under test 15.
Step (4): automatic pressure-maintaining: after water filling completes, opens automatic pressure-maintaining by the control system in operation PLC, and automatic pressure-maintaining process carries out three times for following step (4-1) ~ step (4-3) being circulated successively:
Step (4-1): in pipe under test, pressure is increased to 2.5 times of working pressures;
Step (4-2 :) keeps the force value in pipe under test to be that 2.5 times of working pressures are to 5min;
Step (4-3): make pipe under test off-load.
Step (5): result judges and preserves: described step (4-1) ~ step (4-3) often completes once, the voltage drop value that the control system of PLC shows pipe under test in this section of pressure maintaining period also ejects the button whether preserved, when operating personnel confirm that the voltage drop value of pipe under test is all not more than setting value, pipe under test is judged as qualified, selects saving result; Otherwise pipe under test is judged as defective, not saving result.
Value shown in step (5) comprises first paragraph voltage drop value, second segment voltage drop value and the 3rd section of voltage drop value successively, consider the sebific duct effect of being under pressure, itself have the length variations of extending or shrinking, voltage drop value must have, and regulation first paragraph voltage drop value is not more than 0.8Mpa, and second segment voltage drop value is not more than 0.5Mpa, 3rd section of voltage drop value is not more than 0.3Mpa, if three sections all satisfied, then pipe under test be judged as qualified, otherwise defective.
Step (6): provide pressure testing report: have sebific duct model in pressure testing report comprises, pressure test pressure, pressure testing time, each section of voltage drop value, pressure drop scheme and conclusion etc. in real time.
The version of SMIS mouth of the present invention and folder lobe is not limited to the form described in embodiment, core mouth 16 all can adopt other shape to the shape of the ring groove 142 on boss 161 and folder lobe 141, as long as both match, core mouth is limited on folder lobe, when adopting other shape also can realize avoiding sebific duct pull-off, core mouth flies out the situation of hurting sb.'s feelings, corner angle are not had based on the boss of annular and groove, be convenient to coordinate, be convenient to batch machining, therefore annular boss and ring groove are preferred embodiment.
In the present invention, the position of all parts is also not limited to the form described in embodiment, is as the criterion can realize described function.
In above-described embodiment, pressure test pressure gets the working pressure of 2.5 times, pressure testing time tmin=5min, pressure test pressure of the present invention and pressure testing time are not limited to the value in embodiment, and in general, pressure test pressure can be the working pressure of 2 ~ 3 times, such as conventional sebific duct working pressure is 4000psi, 5000psi, 6000psi, then pressure testing scope is 8000 ~ 12000psi, 10000 ~ 15000psi, 12000 ~ 18000psi, and wherein, the English full name of psi is Poundspersquareinch.P refers to that pound pound, a S refer to that square square, an I refer to an inch inch, and Chinese is pound/square inch, is a kind of pressure measurement unit.Same pressure testing time range is 3min ~ 20min, and the pressure testing time usually adopted in actual pressure testing is 3min, 5min, 10min or 15min.
When more harsh to the quality requirements of finished product sebific duct, pressure test pressure can be increased in pressure testing process or extend the pressure testing time, otherwise, pressure test pressure can be reduced or shorten the pressure testing time, but in order to ensure the effective detection to sebific duct, pressure test pressure and pressure testing time should within above-mentioned scopes, and when changing pressure test pressure or pressure testing time, pressure-measuring method still carries out according to the step in above-described embodiment.
The foregoing is only preferred embodiment of the present invention; be not whole embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Except technical characteristic described in instructions, all the other technical characteristics are those skilled in the art's known technology, and in order to outstanding innovative characteristics of the present invention, above-mentioned technical characteristic does not repeat them here.
Claims (10)
1. a pulse segment formula pressure testing device, is characterized in that, comprising two for loading the core mouth of pipe under test, matches with two core mouths respectively in the two ends of pipe under test; One of them core mouth is arranged on gas exhaust duct, gas exhaust duct is provided with vent valve, another core mouth is arranged on main pipeline, and main pipeline is provided with the main water box for supplying water to pipe under test away from one end of core mouth, main pipeline is also provided with pressure-detecting device and main pipeline valve; Be provided with low pressure water injection pump, high-pressure pump, pump end valve and unloader between pressure-detecting device and main pipeline valve, low pressure water injection pump, high-pressure pump, pump end valve and unloader lay respectively on the different arms of main pipeline; Pump end valve is for unloading the excess pressure in high-pressure pump, and unloader is used for for pipe under test pressure release.
2. a kind of pulse segment formula pressure testing device according to claim 1, it is characterized in that, described vent valve, pressure-detecting device, main pipeline valve, low pressure water injection pump, high-pressure pump, pump end valve and unloader are all connected with a PLC.
3. a kind of pulse segment formula pressure testing device according to claim 1, is characterized in that, the arm residing for described low pressure water injection pump is also provided with the first arm valve, the first filtrator and the first high pressure check valve; Arm residing for described high-pressure pump is also provided with the second arm valve, the second filtrator and the second high pressure check valve.
4. a kind of pulse segment formula pressure testing device according to claim 1, is characterized in that, is provided with third high pressure retaining valve between the arm residing for described pump end valve and the arm residing for described unloader.
5. a kind of pulse segment formula pressure testing device according to claim 1, is characterized in that, described core mouth place is provided with pipe under test stationary installation.
6. a kind of pulse segment formula pressure testing device according to claim 5, it is characterized in that, described pipe under test stationary installation comprise symmetrically arranged folder lobe and for drive folder lobe hydraulic chuck, folder lobe is positioned at the outside of described core mouth and core mouth and pipe under test is clamped, core mouth is provided with the boss of annular with the cooperation place of folder lobe, and the surface that folder lobe matches with core mouth is provided with the ring groove matched with described boss.
7. a kind of pulse segment formula pressure testing device according to claim 1, it is characterized in that, described core mouth comprises the main body of tubulose, one end of main body is provided with external thread and is connected by screw thread with described gas exhaust duct or main pipeline, external thread is provided with one for placing the deep gouge of O-ring seal near one end of described pipe under test, described deep gouge ringwise.
8., based on the pressure-measuring method of a kind of pulse segment formula pressure testing device according to claim 1, it is characterized in that, comprise the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test on two core mouths respectively;
Step (2): water filling: by exhaust valve opening, pump end valve and unloader are closed, open low pressure water injection pump to water filling in pipe under test, to be seen when there are flowing out in vent valve, closing vent valve and low pressure water injection pump, detecting pipe under test with or without leaking, leak if occur, then pipe under test is judged to defective, if without leaking, then performs step (3) to pipe under test;
Step (3): boosting: pump end valve, unloader and vent valve are all closed, opening high-pressure pump makes pressure in pipe under test raise, after in pipe under test, pressure is increased to pressure test pressure setting value, high-pressure pump cuts out, while high-pressure pump closedown, pump end valve is opened, and discharge degree unnecessary in high-pressure pump is fallen;
Step (4): pressurize: keep the force value in pipe under test to be the pressure testing time of pressure test pressure setting value to setting;
Step (5): pressure release: after pressurize completes, opens unloader, makes pipe under test off-load;
Step (6): record pressure testing result: the voltage drop value of pipe under test in record pressure maintaining period;
Step (7): multistage pressure testing: repeat step (3) ~ step (6) repeatedly;
Step (8): result judges: when the voltage drop value of the pipe under test recorded in step (6) and step (7) is all not more than setting value, pipe under test is judged as qualified, otherwise defective.
9., based on the pressure-measuring method of a kind of pulse segment formula pressure testing device according to claim 2, it is characterized in that, comprise the following steps:
Step (1): install pipe under test: be arranged at the two ends of pipe under test on two core mouths respectively;
Step (2): setting pressure testing mode: for the pressurize requirement of different pipe under test, input water injection time, pressure rising time, pressure test pressure setting value and pressure testing time in the control system of PLC;
Step (3): water filling: by exhaust valve opening, pump end valve and unloader are closed, open low pressure water injection pump to water filling in pipe under test, to be seen when there are flowing out in vent valve, closing vent valve and low pressure water injection pump, detecting pipe under test with or without leaking, leak if occur, then pipe under test is judged to defective, if without leaking, then performs step (4) to pipe under test;
Step (4): automatic pressure-maintaining: after water filling completes, opens automatic pressure-maintaining by the control system in operation PLC, and automatic pressure-maintaining process is carried out repeatedly for following step (4-1) ~ step (4-3) being circulated successively:
Step (4-1): in pipe under test, pressure is increased to pressure test pressure setting value;
Step (4-2 :) keeps the force value in pipe under test to be the pressure testing time of pressure test pressure setting value to setting;
Step (4-3): make pipe under test off-load;
Step (5): result judges and preserves: described step (4-1) ~ step (4-3) often completes once, the voltage drop value that the control system of PLC shows pipe under test in this section of pressure maintaining period also ejects the button whether preserved, when operating personnel confirm that the voltage drop value of pipe under test is all not more than setting value, pipe under test is judged as qualified, selects saving result; Otherwise pipe under test is judged as defective, not saving result.
10. pressure-measuring method according to claim 8 or claim 9, it is characterized in that, described pressure test pressure setting value is 2 ~ 3 times of pipe under test working pressure, and the described pressure testing time is 3min ~ 20min.
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Application publication date: 20151223 |