CN205300868U - Gas tightness test machine that changes tube replacement spare is moulded to steel - Google Patents

Abstract

The utility model provides an air tightness testing machine for a steel-plastic conversion pipe fitting, which includes a frame and a first hydraulic cylinder connected to one end of a short straight steel-plastic conversion pipe fitting or one end of a 90-degree bent steel-plastic conversion pipe fitting. Flange, the second flange connected to the second hydraulic cylinder for connecting one end of the long straight steel-plastic conversion pipe fitting, the third flange connected to the third hydraulic cylinder for connecting the other end of the 90-degree angled steel-plastic conversion pipe fitting , the first blocking plate connected to the other end of the short straight steel-plastic conversion pipe fitting, the second blocking plate connected to the other end of the long straight steel-plastic conversion pipe fitting, air compressor, pressure gauge, programmable logic controller, test water tank, circulating water pump, Water tank and control panel; the utility model solves the defects existing in the testing process of steel-plastic conversion pipe fittings in the past, improves the testing efficiency, and eliminates the influence of human factors on the test results.

Description

An airtightness testing machine for steel-plastic conversion pipe fittings

technical field

The utility model relates to an air tightness testing device, in particular to an air tightness testing machine for steel-plastic conversion pipe fittings.

Background technique

When laying natural gas pipelines, the connection between steel pipes and plastic pipes is often encountered. Steel-plastic conversion pipes are used as a transition between the two materials. Special equipment and processes are used to connect steel pipes and plastic pipes. Two pipes of different materials The ports are overlapped and combined, and the remaining two ports are respectively connected with steel pipes or plastic pipes of the same material. The steel-plastic conversion pipe fittings are intuitively divided into two types, one is a straight pipe steel-plastic conversion pipe fitting, and the other is a 90-degree pipe. Angle steel-plastic conversion pipe fittings, because the overlapping joints of steel pipes and plastic pipes are the interference fit connection parts of two different materials, due to the different expansion coefficients of different materials, there is a possibility of leaking air in theory. When there is a certain pressure of natural gas passing through the pipeline, if the seal is not tight, the leaking gas will cause a safety accident.

At present, there are two known methods for airtightness testing of steel-plastic conversion pipe fittings. The first method is to clamp the steel-plastic conversion pipe fittings on the equipment, but there is no water circulation device, and seal the two ends of the steel-plastic pipe fittings through hydraulic or cylinder Afterwards, test gas is introduced into one end. At this time, use a brush to apply soap liquid on the overlapping joint of steel and plastic, and observe whether there are bubbles. Staying for a long time makes it impossible to form a full-coverage soap film, resulting in missed inspections. In order to avoid missed inspections, the only way to ensure the detection effect is to apply multiple times and uninterrupted smearing. This method of detection is not only efficient Low, and serious pollution, it is difficult to meet the requirements of clean production. In addition, because the soap is artificially proportioned, the proportioning concentration directly affects the foaming effect, so human factors have too much influence on the test results.

The second is to use a special fixture to seal the two ends of the steel-plastic conversion pipe fitting externally, and pass the test gas into one end. Manually or with a lifting arm, the prepared steel-plastic conversion pipe fitting is put into the test container filled with water. If no air bubbles are generated within the specified time, it is a qualified product. This test method is extremely inefficient, and the labor intensity of the operator is high. At the same time, the installation of the fixture needs to overlap with the plastic pipe, so it is easier to damage the surface of the plastic pipe and the surface of the plastic pipe. The surface of the steel pipe, thus causing secondary product quality problems.

Contents of the invention

The technical problem to be solved by the utility model is: how to solve the defects existing in the testing process of the steel-plastic conversion pipe fittings in the past.

The technical solution adopted by the utility model is: an air tightness testing machine for steel-plastic conversion pipe fittings, including a frame, and a steel-plastic pipe connected with the first hydraulic cylinder for connecting one end of a short straight steel-plastic conversion pipe fitting or a 90-degree bent steel-plastic joint. The first flange at one end of the conversion pipe fitting, the second flange connected with the second hydraulic cylinder for connecting one end of the long straight steel-plastic conversion pipe fitting, and the second flange connected with the third hydraulic cylinder for connecting the 90-degree angled steel-plastic conversion pipe fitting The third flange at one end, the first blocking plate connecting the other end of the short straight steel-plastic conversion pipe fitting, the second blocking plate connecting the other end of the long straight steel-plastic conversion pipe fitting, air compressor, pressure gauge, programmable logic controller, Test the water tank, circulating water pump, water tank, control panel, the first flange and the first blocking plate correspond horizontally, the second flange and the second blocking plate correspond vertically, and the first flange and the second flange pass through The pressure gauge pipe is connected to the air compressor, and the inspection tank is connected to the water tank through the circulating water pump.

As a preferred method: it also includes a telescopic adjustment device installed on both sides of the upper end of the test tank for length adjustment. The telescopic adjustment device includes an upper steel pipe with a hole installed on the top plate of the frame, and a hole with a hole inserted into the upper steel pipe at one end. The lower steel pipe, the bolts passing through the holes of the upper steel pipe and the lower steel pipe for connection.

As a preferred method: it also includes a retractable first backing plate for supporting short straight steel-plastic conversion pipe fittings or 90-degree angled steel-plastic conversion pipes, and a retractable first backing plate for supporting long straight steel-plastic conversion pipes or 90-degree angled steel-plastic conversion pipes Retractable second backing plate for pipe fittings.

As a preferred mode: there is a water level detection device connected with a programmable logic controller inside the test water tank.

As a preferred mode: a filtering device is arranged on the inlet of the test water tank, and a drain valve is arranged on the body of the test water tank.

The beneficial effects of the utility model are: the utility model concentrates the tests of two different styles of pipe fittings, the straight pipe steel-plastic conversion pipe fitting and the 90-degree elbow steel-plastic conversion pipe fitting, on one device, and at the same time, in order to adapt to more different lengths Product specifications, the upper and lower steel pipes of the utility model are scalable and adjustable structures, the utility model is equipped with a circulating water device and a multi-station test function independent of each other, the utility model uses a programmable logic controller to improve the degree of automation, The detection efficiency is improved, the labor intensity is reduced, and the influence of human factors on the test results is removed. The utility model can centrally complete the test items of two different air pressures and different durations required by two national standards on one machine. The new model is equipped with a circulating water filter device and a humanized circulating water diversion device.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Among them, 1. Hydraulic pump station, 2. Directional valve, 3. First hydraulic cylinder, 4. Air compressor; 5. Pressure storage tank, 6. Flow control valve, 7. Pressure adjustment main valve, 8. Pressure adjustment Secondary valve, 9. Circulating water pump, 10. Water pump valve, 11. Circulating water tank, 12. Test tank, 13. Control panel, 14. Steel pipe end, 15. Transition joint, 16. Plastic pipe end, 17. Drainage valve, 18. First flange, 19. Filter screen cover, 20. Water level detection device, 21. Lower steel pipe connection support; 22. Lower steel pipe, 23. Bolt, 24. Upper steel pipe, 25. Top plate, 26. Second hydraulic pressure Oil cylinder, 27, the third hydraulic cylinder, 28, the second flange, 29, the third flange, 30, the frame, 31, the first pressure gauge, 32, the second pressure gauge, 33, the third pressure gauge, 34 , the fourth pressure gauge, 35, the fifth pressure gauge, 36, short straight tube steel-plastic conversion pipe fittings, 37, long straight pipe steel-plastic conversion pipe fittings, 38, 90-degree angle steel-plastic conversion pipe fittings, 39, the first blocking plate, 40, the second blocking plate, 41, the first backing plate, 42, the second backing plate, 44, the hydraulic clamping solenoid valve.

detailed description

Example 1

As shown in Figure 1, the sealing performance test for the short straight pipe steel-plastic conversion pipe fitting 36 is as follows: adjust the height of the first backing plate 41 of the horizontal support to ensure that the center line of the short straight pipe steel-plastic conversion pipe fitting 36 to be tested is aligned with the center line of the first hydraulic cylinder. The lines overlap, start the power supply of the hydraulic pump station 1 and the motor of the air compressor 4 through the control panel 13, and select the test pressure through the control panel 13, so that the hydraulic clamping direction valve 2 is energized, and the hydraulic oil drives the first hydraulic cylinder 3. The piston rod extends to the left and pushes the first flange 18 to move to the left. As the piston rod on the first hydraulic cylinder 3 continues to extend to the left, the short straight steel-plastic conversion pipe fitting 36 is clamped on the first block Between the plate 39 and the first flange 18, through the automatic test button of the control panel 13, the programmable logic device configured in the control panel 13 outputs a signal immediately after receiving the signal provided by the automatic test button, so that the circulating water pump 9, the water pump When the valve 10 is energized, the circulating water pump 9 pumps the water in the circulating water tank 11 into the test tank 12 and completely submerges the short straight steel-plastic conversion pipe fitting to be tested, and the water level detection device 20 sends a signal to the programmable logic device, so that the circulating water pump 9. The water pump valve 10 is de-energized and stopped, while the circulating water pump 9 and the water pump valve 10 are de-energized and stopped, the programmable logic device selects the test pressure according to the two-position knob configured on the control panel 13, and passes through the first flange 18. Pass the test gas into the short straight steel-plastic conversion pipe fitting 36, and maintain the pressure to confirm whether there are any bubbles at the transition connection 15 of the short straight steel-plastic conversion pipe fitting 36 to be tested. , the test water is automatically pumped back to the circulating water tank 11 by the water pump valve 10, and the automatic test process ends. At this time, press the hydraulic release button configured on the control panel 13 to make the hydraulic release direction valve 2 energized, and the hydraulic oil drives the hydraulic cylinder 3. The piston rod retracts to the right and pulls the first flange 18 to move to the right. As the piston rod on the hydraulic cylinder 3 continues to retract to the right, the short straight steel-plastic conversion pipe to be tested is released.

Example 2

As shown in Figure 1, the sealing performance test for the steel-plastic conversion pipe fitting 37 of the long straight pipe is as follows: select the second backing plate 42 of the steel-plastic conversion pipe fitting with an appropriate height, and ensure that the plastic pipe end 16 of the steel-plastic conversion pipe fitting 37 for the long straight pipe to be tested is at the bottom. , the center line coincides with the center line of the second hydraulic cylinder 26, and the hydraulic pump station 1 and the motor power supply of the air compressor 4 are started by the manual button configured on the control panel 13, and selected by the two-position knob configured on the control panel 13 To test the pressure, press and hold the button configured on the control panel 13 to energize the hydraulic clamping solenoid valve 44, drive the piston rod on the second hydraulic cylinder 26 to extend downward, and drive the second flange 28 to move downward, As the piston rod on the second hydraulic cylinder 26 continues to protrude downwards, clamp the long straight steel-plastic conversion pipe fitting 37 between the second blocking plate 40 and the second flange 28, and press the button on the control panel 13 to configure automatic test button, the programmable logic device configured in the control panel 13 immediately outputs a signal after receiving the signal provided by the automatic test button, so that the circulating water pump 9 and the water pump valve 10 are energized, and the water pump pumps the water in the circulating water tank 11 into the test water tank 12 and completely submerge the transition joint 15 on the long straight steel-plastic conversion pipe fitting 37 to be tested, the circulating water pump 9, and the water level detection device 20 send signals to the programmable logic logic, so that the circulating water pump 9 and the water pump valve 10 fail Power on and stop, while the circulating water pump 9 and water pump valve 10 lose power and stop, the programmable logic device selects the test pressure according to the two-position knob configured on the control panel 13, and passes through the second flange 28 on the second hydraulic cylinder 26 Pass the test gas into the long straight steel-plastic conversion pipe fitting 37 to be tested, and maintain the pressure to confirm whether there are any bubbles at the transition joint 15 of the steel-plastic conversion pipe fitting 37 to be measured. When the time is up, the test water is automatically pumped back to the circulating water tank 11 by the return water pump valve 10, and the automatic test process ends. At this time, the cylinder release button configured on the control panel 13 is pressed to energize the hydraulic clamping solenoid valve 44. The piston rod of the second hydraulic cylinder retracts upwards, and pulls the second flange 28 to move upwards. As the piston rod continues to retract upwards, the long straight steel-plastic conversion pipe 37 to be measured is released.

Example 3

As shown in Figure 1, the sealing performance test for the 90-degree angled steel-plastic conversion pipe fitting 38 is as follows: select the first backing plate 41 of the steel-plastic conversion pipe fitting of an appropriate height and the second backing plate 42 on the side of the 90-degree angled steel-plastic conversion pipe fitting to ensure that the Measure the 90-degree angle steel-plastic conversion pipe fitting 38, the plastic pipe end 16 is down, the centerline of the plastic pipe coincides with the centerline of the first hydraulic cylinder 3, and the hydraulic pump station 1 and the motor of the air compressor 4 are started by the manual button configured on the control panel 13 Power supply, and through the two-position knob on the control panel 13, select the test pressure, press and hold the hydraulic clamping button on the control panel 13, so that the hydraulic clamping direction valve 2 is energized, and the hydraulic oil drives the first hydraulic cylinder 3 The piston rod on the top stretches out to the left and pushes the first flange 18 to move to the left. As the piston rod on the first hydraulic cylinder 3 continues to stretch out to the left, the 90-degree angled steel-plastic conversion pipe fitting 38 is clamped at 90 Between the second backing plate 42 on the side of the angled steel-plastic conversion pipe fitting and the first flange 18, at the same time ensure that the centerline of the steel pipe end 14 of the 90-degree angled steel-plastic conversion pipe fitting 38 coincides with the centerline of the third hydraulic cylinder 27, and press the control panel The third hydraulic cylinder 27 configured on 13 clamps the button so that the piston rod on the third hydraulic cylinder 27 stretches out downwards, and drives the third flange 29 to move downwards. As the piston rod of the third hydraulic cylinder 27 continues to Stretch out downwards, the third flange 29 of the third hydraulic cylinder 27 seals and clamps the upper end of the 90-degree angled steel-plastic conversion pipe fitting 38, press the automatic test button configured on the control panel 13, the configured in the control panel 13 After the programmable logic device receives the signal provided by the automatic test button, it outputs a signal immediately, so that the circulating water pump 9 and the water pump valve 10 are energized, and the water pump pumps the water in the circulating water tank 11 into the test tank 12 and completely submerges the test tank 90 After the steel-plastic conversion pipe fittings with high angle angle, the water level detection device 20 sends a signal to the programmable logic device, so that the circulating water pump 9 and the water pump valve 10 are powered off and stopped, and the circulating water pump 9 and the water pump valve 10 are powered off and stopped at the same time, the programmable The logic device selects the test pressure according to the two knobs configured on the control panel 13, passes the test gas into the 90-degree angle steel-plastic conversion pipe fitting 38 through the gas guide channel on the first flange 18, and maintains the pressure, and confirms that Test whether there are bubbles at the transition joint 15 of the 90-degree angle steel-plastic conversion pipe fitting 38. When the pressure holding time is up, the test water is automatically pumped back to the circulating water tank 11 by the return water pump valve 10. After the automatic test process is over, press the control button first. The button configured on the panel 13, the piston rod on the third hydraulic cylinder 27 retracts upwards, and drives the third flange 28 to move upwards, the upper end of the 90-degree angled steel-plastic conversion pipe 38 is released, and then press the button configured on the control panel 13 The hydraulic release button on the hydraulic release directional valve 2 is energized, and the hydraulic oil drives the piston rod on the first hydraulic cylinder 3 to retract to the right, and pulls the first flange 18 to move to the right. The piston rod continues to retract rightward, and the 90-degree angle steel-plastic conversion pipe fitting 38 to be tested is released.

Claims (5)

1. the air tightness test machine changing pipe fitting moulded by a steel, it is characterized in that: include frame, what be connected with the first hydraulic jack moulds conversion pipe fitting one end or the first flange changing pipe fitting one end moulded by 90 degree bent angle steel for connecting short straight steel, the second flange moulding conversion pipe fitting one end for connecting long straight steel being connected with the second hydraulic jack, the three-flange moulding the conversion pipe fitting other end for connecting 90 degree of bent angle steel being connected with the 3rd hydraulic jack, connect short straight steel and mould the first closure plate of the conversion pipe fitting other end, connect long straight steel and mould the second closure plate of the conversion pipe fitting other end, air compressor machine, Pressure gauge, programmable logic controller (PLC), testing flume, water circulating pump, water tank, control panel, first flange and the first closure plate are corresponding in level, second flange and the second closure plate are corresponding on vertically, first flange and the second flange connect air compressor machine by Pressure gauge pipeline, inspection groove is connected with water tank by water circulating pump.

2. the air tightness test machine of conversion pipe fitting moulded by a kind of steel according to claim 1, it is characterized in that: also include being arranged on the extension adjustment device for regulating length of both sides, testing flume upper end, the with holes lower steel pipe of upper steel pipe, the bolt through upper steel pipe and lower steel pipe hole for connecting are inserted in upper steel pipe with holes, one end that extension adjustment device includes being arranged on the top board of frame.

3. the air tightness test machine of conversion pipe fitting moulded by a kind of steel according to claim 1, it is characterised in that: also include moulding conversion pipe fitting or 90 degree bent angle steel are moulded telescopic first backing plate of conversion pipe fitting, moulded conversion pipe fitting or telescopic second backing plate changing pipe fitting moulded by 90 degree of bent angle steel for supporting long straight steel for supporting short straight steel.

4. the air tightness test machine of conversion pipe fitting moulded by a kind of steel according to claim 1, it is characterised in that: there is the condensate tank of dehumidifier being connected with programmable logic controller (PLC) inside testing flume.

5. the air tightness test machine of conversion pipe fitting moulded by a kind of steel according to claim 1, it is characterised in that: the import of testing flume has defecator, with the groove of testing flume, has water discharging valve.