Polyethylene gas pipeline hot melt welding strength detection device

Abstract

The utility model discloses a polyethylene gas pipeline hot melt welding strength detection device relates to pipeline detection technical field, including water tank and two plugging components, one plugging component is installed with air -blowing subassembly, and two plugging components are used for the plugging of polyethylene gas pipeline both ends, and air -blowing subassembly is used for the inflation pressurization to polyethylene gas pipeline inside, and the left and right sides of water tank all are provided with through -hole, and the inside installation of through -hole has annular air bag. The annular air bag after expansion is used for clamping polyethylene gas pipeline, and the hot melt welding of two polyethylene gas pipelines is immersed in the water injection of water tank, is pushed down by hydraulic cylinder and moves down the pressing plate, and the pressing plate cooperates the pressing plate and carries out the pressurization operation to the hot melt welding of two polyethylene gas pipelines, and the plugging component seals the both ends of pipeline, and the air -blowing subassembly is inflated and pressurized to the inside of pipeline, and whether the hot melt welding is overflowed bubble after being observed extruded, can judge whether the strength of the hot melt welding of two polyethylene gas pipelines is qualified.

Description

Technical Field

[0001] This utility model relates to the field of pipeline inspection technology, and in particular to a device for testing the hot-melt welding strength of polyethylene gas pipelines. Background Technology

[0002] In recent years, polyethylene has gradually replaced steel pipes due to its strong corrosion resistance, long service life, good toughness, good insulation properties, relatively low cost, and ease of construction and maintenance. It has been widely used in municipal and building water supply and drainage, gas heating, agricultural irrigation, and mining mineral transportation. Especially in the gas sector, the introduction of a series of national standards has accelerated the process of replacing steel with plastic in my country's gas pipeline network.

[0003] Polyethylene gas pipelines are connected by thermofusion welding. Before use, the strength of the thermofusion welded areas needs to be tested to ensure that there will be no gas leakage during gas supply. Traditional testing methods rely mainly on direct visual inspection, applying pressure to the thermofusion welded areas and observing for cracks to determine strength. This method can only detect larger cracks and cannot detect small ones, resulting in poor accuracy in the thermofusion weld strength test results and affecting subsequent gas supply. Utility Model Content

[0004] The purpose of this application is to provide a device for testing the strength of hot-melt welding of polyethylene gas pipelines, in order to solve the problem mentioned in the background art that relies on human eyes to observe whether cracks are generated after pressure is applied to the hot-melt welding position of polyethylene gas pipelines to determine whether its strength is qualified. However, when human eyes can only see large cracks and cannot detect small cracks, the accuracy of the test results of hot-melt welding of polyethylene gas pipelines is poor, which affects its subsequent gas supply and use.

[0005] To achieve the above objectives, this application provides the following technical solution: a device for testing the hot-melt welding strength of a polyethylene gas pipeline, comprising a water tank and two sealing components, wherein one of the sealing components is equipped with an air-blowing component, and the two sealing components are used to seal both ends of the polyethylene gas pipeline. The air-blowing component is used to pressurize the polyethylene gas pipeline. The water tank has through holes on its left and right sides, and annular airbags are installed inside the through holes. The polyethylene gas pipeline passes through the two annular airbags. A gas supply pipe is fixedly connected to the annular airbags, and a first valve is installed on the gas supply pipe. A support plate is fixed inside the water tank, and a support plate is fixed on the top of the water tank. A hydraulic cylinder is installed on the top of the support plate, and a carrier plate is fixedly installed at the output end of the hydraulic cylinder. A thrust gauge is installed on the carrier plate, and a pressure plate is installed on the thrust gauge. The pressure plate is located directly above the support plate.

[0006] Furthermore, several rollers are installed at the bottom of the water tank.

[0007] Furthermore, the sealing assembly includes a U-shaped seat, with a first bolt threadedly connected to both the front and rear sides of the U-shaped seat. One end of the first bolt located inside the U-shaped seat is rotatably connected to a clamping plate via a bearing. A second bolt is threadedly connected to the U-shaped seat, and one end of the second bolt located inside the U-shaped seat is rotatably connected to a fixing plate via a bearing. A rubber plug is fixed to the other side of the fixing plate.

[0008] Furthermore, a guide rod is fixed on the clamp, and a groove for sliding the guide rod is provided on the U-shaped seat.

[0009] Furthermore, the air-blowing assembly includes an air pump, which is mounted on a U-shaped seat. A filter screen is installed at the air inlet of the air pump, and an air delivery pipe is fixedly connected to the air outlet of the air pump. The fixing plate and the rubber plug are both fixedly sleeved on the outside of the air delivery pipe.

[0010] Furthermore, a barometer and a second valve are installed on the air supply pipe.

[0011] In summary, the technical effects and advantages of this utility model are as follows:

[0012] 1. In this utility model, the hot-melt weld of two polyethylene gas pipelines is placed inside the water tank. Air is inflated into the annular air bladder along the gas delivery pipe, causing the annular air bladder to expand and clamp the polyethylene gas pipelines. This prevents water from overflowing between the annular air bladder and the polyethylene gas pipelines when water is added to the tank. After the water in the tank covers the hot-melt weld of the two polyethylene gas pipelines, a hydraulic cylinder pushes the carrier plate and thrust gauge downwards, causing the carrier plate to pressurize the pressure plate downwards. The pressure plate, in conjunction with the support plate, applies pressure to the hot-melt weld of the two polyethylene gas pipelines. The thrust gauge provides a direct visual indication of the pressure applied. A sealing component seals both ends of the pipeline, and an air-blowing component pressurizes the pipeline by blowing air into it, maintaining a certain air pressure inside. Observing whether air bubbles overflow from the hot-melt weld after compression allows for assessment of the strength of the hot-melt weld of the two polyethylene gas pipelines. This method is more intuitive and precise.

[0013] 2. In this utility model, the two first bolts in the sealing assembly are turned by a wrench, so that the two first bolts push the two clamps together and clamp the pipe with the help of the two clamps, thereby fixing the sealing assembly at the end of the pipe. The second bolt is turned by a wrench, so that it pushes the rubber plug to seal the end of the pipe, thereby completing the sealing of both ends of the pipe with the two rubber plugs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a polyethylene gas pipeline hot-melt welding strength testing device according to an embodiment of this application;

[0016] Figure 2 This is a diagram showing the positional relationship between the water tank, the annular airbag, the air pipe, and the support plate in an embodiment of this application.

[0017] Figure 3 This is a diagram showing the positional relationship between the water tank, support plate, hydraulic cylinder, and thrust gauge in the embodiments of this application.

[0018] Figure 4 This is a diagram showing the connection relationship between the sealing component and the air blowing component in the embodiments of this application;

[0019] Figure 5 This is a schematic diagram of the sealing component in an embodiment of this application.

[0020] In the diagram: 1. Water tank; 2. Through hole; 3. Annular airbag; 4. Air supply pipe; 5. Support plate; 6. Support plate; 7. Hydraulic cylinder; 8. Carrier plate; 9. Thrust gauge; 10. Pressure plate; 11. Roller; 12. U-shaped seat; 13. First bolt; 14. Clamping plate; 15. Guide rod; 16. Second bolt; 17. Fixing plate; 18. Rubber plug; 19. Air pump; 20. Air supply pipe; 21. Barometer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example: Reference Figure 1-5 The device shown is a testing device for the hot-melt welding strength of a polyethylene gas pipeline. It includes a water tank 1 and two sealing components. One sealing component is equipped with an air-blowing component. The two sealing components are used to seal both ends of the polyethylene gas pipeline. The air-blowing component is used to pressurize the polyethylene gas pipeline. Multiple rollers 11 are installed at the bottom of the water tank 1 to facilitate the movement of the water tank 1. Through holes 2 are opened on the left and right sides of the water tank 1. Annular air bladders 3 are installed inside the through holes 2. The polyethylene gas pipeline passes through the two annular air bladders 3. A gas supply pipe 4 is fixedly connected to the annular air bladders 3. A first valve is installed on the gas supply pipe 4 to control whether the gas supply pipe 4 is unobstructed. A support plate 5 is fixed inside the water tank 1, and a support plate 6 is fixed on the top of the water tank 1. A hydraulic cylinder 7 is installed on the top of the support plate 6. A carrier plate 8 is fixedly installed at the output end of the hydraulic cylinder 7. A thrust gauge 9 is installed on the carrier plate 8. A pressure plate 10 is installed on the thrust gauge 9. The pressure plate 10 is located directly above the support plate 5.

[0023] The hot-melt weld of two polyethylene gas pipelines is placed inside the water tank 1. Inflation is carried into the annular air bladder 3 along the gas transmission pipe 4, causing the annular air bladder 3 to expand and clamp the polyethylene gas pipeline, preventing water from overflowing between the annular air bladder 3 and the polyethylene gas pipeline when water is filled into the water tank 1. After the water in the water tank 1 is filled to cover the hot-melt weld of the two polyethylene gas pipelines, the hydraulic cylinder 7 pushes the carrier plate 8 and the thrust gauge 9 to move downward, causing the carrier plate 8 to squeeze the pressure plate 10 downward. The pressure plate 10, together with the support plate 5, pressurizes the hot-melt weld of the two polyethylene gas pipelines. The thrust gauge 9 can be used to visually measure the pressure applied. The sealing component seals both ends of the pipeline, and the air blowing component blows air into the pipeline to pressurize it, maintaining a certain air pressure inside the pipeline. By observing whether air bubbles overflow from the hot-melt weld after being squeezed, it can be determined whether the strength of the hot-melt weld of the two polyethylene gas pipelines is qualified.

[0024] The sealing assembly includes a U-shaped seat 12, with a first bolt 13 threadedly connected to both the front and rear sides of the U-shaped seat 12. One end of the first bolt 13 located inside the U-shaped seat 12 is rotatably connected to a clamping plate 14 via a bearing. A second bolt 16 is threadedly connected to the U-shaped seat 12. One end of the second bolt 16 located inside the U-shaped seat 12 is rotatably connected to a fixing plate 17 via a bearing. A rubber plug 18 is fixed to the other side of the fixing plate 17. A guide rod 15 is fixed to the clamping plate 14. A groove is provided on the U-shaped seat 12 for the guide rod 15 to slide, and the guide rod 15 can prevent the clamping plate 14 from rotating on its own.

[0025] Using a wrench, tighten the two first bolts 13 in the sealing assembly, causing the two first bolts 13 to push the two clamping plates 14 together. The two clamping plates 14 clamp the pipe, thus fixing the sealing assembly at the end of the pipe. Using a wrench, tighten the second bolt 16, causing it to push the rubber plug 18 to seal the end of the pipe, so that the two rubber plugs 18 complete the sealing of both ends of the pipe.

[0026] The air-blowing assembly includes an air pump 19, which is mounted on a U-shaped seat 12. A filter screen is installed at the air inlet of the air pump 19, and an air supply pipe 20 is fixedly connected to the air outlet of the air pump 19. A fixing plate 17 and a rubber plug 18 are both fixedly sleeved on the outside of the air supply pipe 20. A pressure gauge 21 and a second valve are installed on the air supply pipe 20. The second valve can control whether the air supply pipe 20 is unobstructed.

[0027] Air is pumped into the pipe through air supply pipe 20 using air pump 19, which pressurizes the inside of the pipe. The pressure inside the pipe can be observed with the help of barometer 21.

[0028] Obviously, hydraulic cylinder 7 is equipped with a hydraulic pump station to enable it to work properly. Equipping hydraulic cylinders with hydraulic pump stations is a standard practice for technicians in this field, and the specific setup method will not be described in detail here.

[0029] Working principle of this utility model:

[0030] First, the two polyethylene gas pipes, which have been hot-melted and welded, are passed through the middle of the two annular gas bags 3 in sequence, so that the hot-melt weld position of the pipe is inside the water tank 1 and is supported by the support plate 5. Then, the first valve on the gas pipe 4 is opened, and gas is inflated into the annular gas bag 3 along the gas pipe 4, so that the annular gas bag 3 expands and tightly clamps the polyethylene gas pipe. Water is then injected into the water tank 1 until the water level is higher than the hot-melt weld position of the pipe. Then, the water injection is stopped, and the water in the water tank 1 cannot overflow between the annular gas bag 3 and the pipe.

[0031] Take out the two sealing components and place them at both ends of the pipe. Use a wrench to tighten the two first bolts 13 in the same sealing component, so that the two first bolts 13 push the two clamps 14 together until the two clamps 14 firmly clamp the pipe. Use a wrench to tighten the second bolt 16, so that it pushes the rubber plug 18 toward the end of the pipe until the rubber plug 18 blocks the end of the pipe. Then, open the second valve on the air supply pipe 20 and start the air pump 19 to fill the pipe with air along the air supply pipe 20. Observe the pressure gauge 21 until the air pressure inside the pipe reaches the predetermined value. Then, close the air pump 19 and the second valve.

[0032] The hydraulic cylinder 7 is extended, causing it to push the pressure plate 10 downwards. The force gauge 9 can measure the thrust of the pressure plate 10 on the pipeline. Once the thrust reaches the predetermined value, the hydraulic cylinder 7 is retracted. By observing whether air bubbles are generated at the pipeline's hot-melt weld position, it can be determined whether the pipeline's hot-melt weld position leaks air after being pressurized. This indicates whether the strength of the pipeline's hot-melt weld position is up to standard. If air bubbles are present, it means that the strength of the pipeline's hot-melt weld position is not up to standard after being pressurized. If no air bubbles are present, it means that the strength of the pipeline's hot-melt weld position is up to standard.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the strength of hot-melt welding of polyethylene gas pipelines, comprising a water tank (1), characterized in that: It also includes two sealing components, one of which is equipped with an air-blowing component. The two sealing components are used to seal both ends of the polyethylene gas pipeline. The air-blowing component is used to pressurize the polyethylene gas pipeline. The water tank (1) has through holes (2) on the left and right sides. The through holes (2) are equipped with annular airbags (3). The polyethylene gas pipeline passes through the two annular airbags (3). The annular airbags (3) are fixedly connected to a gas transmission pipe (4). The gas transmission pipe (4) is equipped with a first valve. The water tank (1) is fixedly equipped with a support plate (5). The top of the water tank (1) is fixedly equipped with a support plate (6). The top of the support plate (6) is equipped with a hydraulic cylinder (7). The output end of the hydraulic cylinder (7) is fixedly equipped with a carrier plate (8). The carrier plate (8) is equipped with a thrust gauge (9). The thrust gauge (9) is equipped with a pressure plate (10). The pressure plate (10) is located directly above the support plate (5).

2. The polyethylene gas pipeline hot-melt welding strength testing device according to claim 1, characterized in that: The bottom of the water tank (1) is equipped with several rollers (11).

3. The polyethylene gas pipeline hot-melt welding strength testing device according to claim 1, characterized in that: The sealing assembly includes a U-shaped seat (12), with a first bolt (13) threaded on both the front and rear sides of the U-shaped seat (12). The end of the first bolt (13) located inside the U-shaped seat (12) is rotatably connected to a clamping plate (14) via a bearing. A second bolt (16) is threaded on the U-shaped seat (12), and the end of the second bolt (16) located inside the U-shaped seat (12) is rotatably connected to a fixing plate (17) via a bearing. A rubber plug (18) is fixed on the other side of the fixing plate (17).

4. The polyethylene gas pipeline hot-melt welding strength testing device according to claim 3, characterized in that: A guide rod (15) is fixed on the clamp (14), and a sliding groove for sliding the guide rod (15) is provided on the U-shaped seat (12).

5. The polyethylene gas pipeline hot-melt welding strength testing device according to claim 3, characterized in that: The air-blowing assembly includes an air pump (19), which is mounted on a U-shaped seat (12). A filter screen is installed at the air inlet of the air pump (19), and an air supply pipe (20) is fixedly connected to the air outlet of the air pump (19). The fixing plate (17) and the rubber plug (18) are both fixedly sleeved on the outside of the air supply pipe (20).

6. The polyethylene gas pipeline hot-melt welding strength testing device according to claim 5, characterized in that: A barometer (21) and a second valve are installed on the air supply pipe (20).

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