Sensor-based device and method for detecting the air tightness of stainless steel pipes

Abstract

This invention belongs to the field of stainless steel pipe airtightness testing, specifically a sensor-based stainless steel pipe airtightness testing device and method. It includes a base, a support plate fixedly connected to the top of the base, a first air inlet pipe rotatably connected to the inner wall of the support plate, a second air inlet pipe rotatably connected to one end of the first air inlet pipe, an air pump at one end of the second air inlet pipe, a hydraulic cylinder fixedly connected to the top of the base away from the support plate, a sliding plate fixedly connected to the output end of the hydraulic cylinder, the sliding plate slidably connected to the base, and a pressure sensor rotatably connected to the outer wall of the sliding plate. This invention provides a sensor-based stainless steel pipe airtightness testing device and method. An electric telescopic rod controls the arc-shaped surface of the bottom of a sponge to adhere to the outer wall of the stainless steel pipe. Soap water sprayed from a second nozzle penetrates into the sponge, and the sponge is used to apply the soap water, preventing excessive dripping and facilitating more even application.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel pipe air tightness testing, specifically a sensor-based device and method for testing the air tightness of stainless steel pipes. Background Technology

[0002] Stainless steel pipe is a hollow, long, cylindrical steel material. It is used as a pipeline for transporting fluids and is widely used in industrial pipelines such as petroleum, chemical, medical, food, light industry, and machinery, as well as mechanical structural components. Stainless steel pipes are made from acid- and heat-resistant steel billets, which are heated, pierced, sizing, hot-rolled, and cut. Stainless steel pipes are classified into two main categories: seamless stainless steel pipes and welded stainless steel pipes (seamed steel pipes). Based on the outer diameter and shape of the pipe, they can be further divided into round pipes and shaped pipes, with round pipes being the most widely used.

[0003] In the application of stainless steel pipes, it is often necessary to splice multiple sections of stainless steel pipes to transport fluids. To ensure that the fluid does not leak during transmission within these multiple sections, an airtightness test is required after splicing. Current technology often uses a pressure decay method for airtightness testing. A pressure sensor is connected to one end of the stainless steel pipe, and gas is introduced into the other end and pressurized for a period of time. The pressure sensor monitors the pressure change within the stainless steel pipe to determine if there is a leak. However, pressure sensors are typically connected to the stainless steel pipe via threads, and gaps cannot be guaranteed after connection. If there are gaps at the connection between the pressure sensor and the stainless steel pipe, the air pressure inside the pipe will gradually decrease, affecting the airtightness test results. Furthermore, as the air pressure inside the stainless steel pipe increases, the temperature inside the pipe will rise, leading to gas expansion. During the pressurization process, the stainless steel pipe itself begins to dissipate heat, causing the temperature to gradually recover, and the pressure begins to decrease. Consequently, the pressure sensor reading will continuously decrease during the pressurization process, affecting the assessment of the stainless steel pipe's airtightness.

[0004] Therefore, the present invention provides a sensor-based device and method for detecting the airtightness of stainless steel pipes. Summary of the Invention

[0005] To address the shortcomings of existing technologies, pressure sensors are typically connected to stainless steel tubes via threads. However, this connection cannot guarantee the absence of gaps. Gaps at the connection point cause a gradual decrease in air pressure within the tube, affecting the airtightness test results. Furthermore, as the air pressure increases, the temperature inside the tube rises, leading to gas expansion. During the pressure-holding process, the stainless steel tube dissipates heat, causing the temperature to gradually recover, resulting in a decrease in pressure. Consequently, the pressure sensor reading continuously decreases during the pressure-holding process, impacting the assessment of the tube's airtightness. This invention proposes a sensor-based airtightness testing device and method for stainless steel tubes.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: The sensor-based stainless steel pipe airtightness detection device of this invention includes a base, a support plate fixedly connected to the top of the base, a first air inlet pipe rotatably connected to the inner wall of the support plate, a second air inlet pipe rotatably connected to one end of the first air inlet pipe, an air pump provided at one end of the second air inlet pipe, a hydraulic cylinder fixedly connected to the top of the base and the side away from the support plate, a sliding plate fixedly connected to the output end of the hydraulic cylinder, the sliding plate being slidably connected to the base, and a pressure sensor rotatably connected to the outer wall of the sliding plate. It also includes:

[0007] Support components for supporting the pre-inspected stainless steel tubes;

[0008] A spray coating assembly is used to test the sealing performance of the connection between the pressure sensor and the stainless steel tube.

[0009] Rotating assembly, used to control the rotation of the stainless steel tube on the support assembly;

[0010] Heat dissipation components are used to cool the stainless steel tubes during the airtightness testing process.

[0011] Spray assembly for cleaning soapy water off stainless steel pipes.

[0012] Preferably, the support assembly includes two sets of brackets, which are symmetrically fixedly installed on the top of the base, and a heat-conducting plate is fixedly connected between the two sets of brackets. The top of the heat-conducting plate is arc-shaped.

[0013] Preferably, the spraying assembly includes a top plate, which is fixedly mounted on the top of a support plate. A first motor is fixedly connected to one side of the top plate. The output end of the first motor extends into the interior of the top plate and is fixedly connected to a lead screw. The lead screw is rotatably connected to the top plate. A slider is connected to the outer wall of the lead screw via a screw-nut pair. The slider is slidably connected to the top plate. A water tank is fixedly connected to the bottom of the slider. A first liquid inlet pipe is fixedly connected to the inner wall of the water tank. A second liquid inlet pipe is slidably connected to the inner wall of the first liquid inlet pipe. A second nozzle is provided at the bottom of the second liquid inlet pipe.

[0014] Preferably, a mounting plate is fixedly connected to the outer wall of the second nozzle, and a sponge is fixedly connected to the bottom of the mounting plate, the bottom of the sponge being arc-shaped.

[0015] Preferably, the rotating assembly includes a gear ring, which is fixedly installed on the outer wall of the first air intake pipe. A second motor is fixedly connected to one side of the support plate. The output end of the second motor extends into the interior of the support plate and is fixedly connected to a gear, which meshes with the gear ring.

[0016] Preferably, the heat dissipation assembly includes a sleeve disposed below the heat-conducting plate. A plurality of heat dissipation plates are fixedly connected at equal intervals to the inner wall of the sleeve. The heat dissipation plates are fixedly connected to the heat-conducting plate. An exhaust fan is fixedly connected to one side of the sleeve. An exhaust pipe is connected to the output end of the exhaust fan. One end of the exhaust pipe extends into the interior of the sleeve.

[0017] Preferably, the outer wall of the heat sink is fixedly connected with several sets of guide plates at equal intervals. The guide plates are installed at an angle, and the angles of adjacent sets of guide plates are opposite.

[0018] Preferably, the spray assembly includes a water storage chamber located inside the base. Two liquid inlets are symmetrically arranged on the outer wall of the base, both communicating with the water storage chamber. A fixing frame is fixedly connected to the outer wall of the second nozzle above the mounting plate. The fixing frame is arc-shaped. Two first nozzles are symmetrically fixedly connected to the inner wall of the fixing frame, both installed at an angle. Two water pumps are symmetrically fixedly connected to the bottom of the fixing frame. The output ends of the water pumps are connected to telescopic pipes. One end of the telescopic pipe is connected to a first nozzle, and the other end of the telescopic pipe passes through the liquid inlet and extends into the water storage chamber. An electric telescopic rod is fixedly connected to the bottom of the water tank, and the output end of the electric telescopic rod is fixedly connected to the fixing frame. Two discharge ports are symmetrically arranged on the top of the base, and filter screens are fixedly connected to the inner walls of the discharge ports.

[0019] Preferably, two collector plates are symmetrically fixedly connected to the top of the heat-conducting plate, and both collector plates are set in an arc shape.

[0020] A sensor-based method for detecting the airtightness of stainless steel pipes, applicable to the aforementioned sensor-based device for detecting the airtightness of stainless steel pipes, comprises the following steps:

[0021] S1: Insert the first intake pipe into one end of the stainless steel pipe and connect it to the stainless steel pipe threadedly. Insert the pressure sensor into the other end of the stainless steel pipe and connect it to the stainless steel pipe threadedly as well.

[0022] S2: Use the second nozzle to spray soapy water at the connection between the pressure sensor and the stainless steel tube to determine whether there is air leakage at the connection between the pressure sensor and the stainless steel tube during the pre-test.

[0023] S3: Use the first nozzle to spray room temperature water to clean the connection between the pressure sensor and the stainless steel tube with soapy water, and spray the stainless steel tube to cool it down while inflating it.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The sensor-based stainless steel pipe airtightness detection device and method of the present invention controls the arc-shaped surface of the bottom of the sponge to fit against the outer wall of the stainless steel pipe by an electric telescopic rod. The soap water sprayed from the second nozzle seeps into the sponge and is applied by the sponge. This can prevent a large amount of soap water from dripping and make it easier to apply the soap water more evenly.

[0026] 2. The sensor-based stainless steel pipe air tightness testing device and method of the present invention sprays a small amount of room temperature water onto the heat-conducting plate through the first nozzle, which facilitates lubrication of the contact area between the heat-conducting plate and the stainless steel pipe, prevents damage to the outer wall of the stainless steel pipe due to friction when rotating the heat-conducting plate, and avoids the stainless steel pipe from heating up due to friction, thereby ensuring the accuracy of air tightness testing.

[0027] 3. The sensor-based stainless steel pipe airtightness detection device and method of the present invention sprays room temperature water through a first nozzle. Since the first nozzle is installed at an angle, the sprayed water flows downward at an angle, which facilitates sliding down the outer wall of the stainless steel pipe, thereby facilitating the cleaning of soapy water at the connection between the pressure sensor and the stainless steel pipe.

[0028] 4. The sensor-based stainless steel pipe airtightness detection device and method of the present invention, wherein the arc shape of the top of the heat-conducting plate is attached to the outer wall of the stainless steel pipe, and the heat inside the stainless steel pipe can be transferred through the attachment of the heat-conducting plate. The heat dissipation area of ​​the heat-conducting plate can be increased by setting several heat dissipation plates and several guide plates, thereby improving the heat dissipation effect on the stainless steel pipe, so that the stainless steel pipe can be cooled down to room temperature quickly, which is convenient for maintaining the stability of the pressure sensor value. By using a fan to draw air, the outside air enters the sleeve and flows into the sleeve. After entering the sleeve, the outside air flows along the outer wall of several heat dissipation plates. When passing through the guide plates, it can flow along the inclined surface of the guide plates, thereby carrying away the heat of the stainless steel pipe more quickly.

[0029] 5. The sensor-based stainless steel pipe airtightness detection device and method of the present invention sprays room temperature water onto the inflating stainless steel pipe through a first nozzle, further accelerating the cooling of the stainless steel pipe. Under the wrapping of two manifolds, some room temperature water can remain on the heat-conducting plate to continuously immerse the stainless steel pipe. The immersion environment can greatly improve the heat dissipation efficiency of the stainless steel pipe, making the inflation process closer to isothermal compression, thereby suppressing the temperature rise. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is a perspective view of the base and top plate of the present invention in use;

[0032] Figure 2 This is a perspective view of the water tank and telescopic pipe used in conjunction with the present invention;

[0033] Figure 3 This is an exploded view of the heat-conducting plate and the telescopic pipe used in conjunction with the present invention;

[0034] Figure 4 This is a cross-sectional view of the base and top plate of the present invention in use;

[0035] Figure 5 This is an exploded view of the heat-conducting plate and heat-dissipating plate used in conjunction with the present invention;

[0036] Figure 6 This is a perspective view of the mounting plate of the present invention used in conjunction with a sponge eraser;

[0037] Figure 7 This is a perspective view of the first nozzle of the present invention used in conjunction with the manifold;

[0038] Figure 8 This is the present invention. Figure 4 Enlarged view of point A in the middle;

[0039] Figure 9 This is the present invention. Figure 5Enlarged view of point B in the middle.

[0040] In the diagram: 1. Base; 2. Bracket; 3. Heat-conducting plate; 4. First air inlet pipe; 5. Second air inlet pipe; 6. Air pump; 7. Pressure sensor; 8. Support plate; 9. Top plate; 10. First motor; 11. Lead screw; 12. Slider; 13. Water tank; 14. First liquid inlet pipe; 15. Second liquid inlet pipe; 16. Mounting plate; 17. Sponge; 18. Second motor; 19. Gear; 20. Gear ring; 21. Electric telescopic rod; 22. Fixing frame; 23. First nozzle; 24. Water pump; 25. Telescopic pipe; 26. Water storage chamber; 27. Liquid inlet; 28. Discharge port; 29. ​​Filter screen; 30. Hydraulic cylinder; 31. Slide plate; 32. Collector plate; 33. Heat sink; 34. Sleeve; 35. Guide plate; 36. Exhaust fan; 37. Air outlet pipe; 38. Second nozzle. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0042] like Figures 1 to 9As shown, the present invention provides a technical solution for a sensor-based stainless steel pipe airtightness testing device, comprising a base 1, a support plate 8 fixedly connected to the top of the base 1, a first air inlet pipe 4 rotatably connected to the inner wall of the support plate 8, a second air inlet pipe 5 rotatably connected to one end of the first air inlet pipe 4, an air pump 6 provided at one end of the second air inlet pipe 5, a hydraulic cylinder 30 fixedly connected to the top of the base 1 and away from the support plate 8, a slide plate 31 fixedly connected to the output end of the hydraulic cylinder 30, the slide plate 31 being slidably connected to the base 1, and a pressure sensor 7 rotatably connected to the outer wall of the slide plate 31. The device also includes: a support assembly for supporting the stainless steel pipe to be tested; a spraying assembly for testing the sealing performance at the connection between the pressure sensor 7 and the stainless steel pipe; a rotation assembly for controlling the rotation of the stainless steel pipe on the support assembly; a heat dissipation assembly for cooling the stainless steel pipe during the airtightness testing process; and a spraying assembly for cleaning soapy water from the stainless steel pipe. The spraying assembly includes a top plate 9, which is fixedly mounted on the support plate 8. At the top, a first motor 10 is fixedly connected to one side of the top plate 9. The output end of the first motor 10 extends into the interior of the top plate 9 and is fixedly connected to a lead screw 11. The lead screw 11 is rotatably connected to the top plate 9. A slider 12 is connected to the outer wall of the lead screw 11 through a lead screw and nut pair. The slider 12 is slidably connected to the top plate 9. A water tank 13 is fixedly connected to the bottom of the slider 12. A first liquid inlet pipe 14 is fixedly connected to the inner wall of the water tank 13. A second liquid inlet pipe 15 is slidably connected to the inner wall of the first liquid inlet pipe 14. A second nozzle 38 is provided at the bottom of the liquid pipe 15; a mounting plate 16 is fixedly connected to the outer wall of the second nozzle 38, and a sponge 17 is fixedly connected to the bottom of the mounting plate 16. The bottom of the sponge 17 is arc-shaped; the rotating assembly includes a gear ring 20, which is fixedly installed on the outer wall of the first air inlet pipe 4. A second motor 18 is fixedly connected to one side of the support plate 8. The output end of the second motor 18 extends into the interior of the support plate 8 and is fixedly connected to a gear 19. The gear 19 meshes with the gear ring 20.

[0043] Through the above technical solution, the first air intake pipe 4 is inserted into one end of the stainless steel pipe and threadedly connected to the stainless steel pipe. The pressure sensor 7 is inserted into the other end of the stainless steel pipe and threadedly connected to the stainless steel pipe as well. Soapy water is filled into the water tank 13. The first motor 10 is started, driving the lead screw 11 to rotate, causing the slider 12 to move laterally, which in turn moves the water tank 13 laterally, causing the second nozzle 38 to move laterally. This controls the second nozzle 38 to move to the connection point between the pressure sensor 7 and the stainless steel pipe. The soapy water in the water tank 13 flows along the first liquid inlet pipe 14 and the second liquid inlet pipe 15 to the second nozzle 38, where it is sprayed out. This facilitates the spraying of soapy water onto the connection point between the pressure sensor 7 and the stainless steel pipe. Simultaneously, the second motor 18 is started, driving the gear 19 to rotate, causing the gear ring 20 to rotate, which in turn drives the first air intake pipe 4 to rotate, thereby causing the stainless steel pipe and the pressure sensor 7 to rotate. This allows for the control of pressure... Soap water is sprayed at different locations where the force sensor 7 connects to the stainless steel pipe. Then, the second nozzle 38 is moved laterally by the first motor 10 to the connection between the first air intake pipe 4 and the stainless steel pipe, where soap water is sprayed again. After the soap water is sprayed, the air pump 6 is started to draw outside air into the stainless steel pipe along the second air intake pipe 5 and the first air intake pipe 4. The connection between the stainless steel pipe and the pressure sensor 7 is pre-tested. By observing the changes in the soap water, the tester can determine whether the pressure sensor 7 and the stainless steel pipe are tightly connected, so as to adjust the connection between the pressure sensor 7 and the stainless steel pipe in time. The test of the connection between the first air intake pipe 4 and the stainless steel pipe is the same. After the connection between the pressure sensor 7 and the stainless steel pipe is found to be tight, the air pump 6 is used to introduce gas into the stainless steel pipe and maintain the pressure for a period of time. The airtightness of the stainless steel pipe is determined by observing the changes in the pressure sensor 7 value.

[0044] Specifically, the support assembly includes two sets of brackets 2, which are symmetrically fixedly installed on the top of the base 1. A heat-conducting plate 3 is fixedly connected between the two sets of brackets 2, and the top of the heat-conducting plate 3 is arc-shaped. The heat dissipation assembly includes a sleeve 34, which is located below the heat-conducting plate 3. Several heat dissipation plates 33 are fixedly connected at equal intervals on the inner wall of the sleeve 34. The heat dissipation plates 33 are fixedly connected to the heat-conducting plate 3. An exhaust fan 36 is fixedly connected to one side of the sleeve 34. An exhaust pipe 37 is connected to the output end of the exhaust fan 36. One end of the exhaust pipe 37 extends into the interior of the sleeve 34. Several sets of guide plates 35 are fixedly connected at equal intervals on the outer wall of the heat dissipation plate 33. The guide plates 35 are installed at an angle, and the angles of adjacent sets of guide plates 35 are opposite.

[0045] The above technical solution involves placing the stainless steel tube to be tested on the heat-conducting plate 3, which supports the tube and facilitates testing. The arc shape at the top of the heat-conducting plate 3 fits against the outer wall of the stainless steel tube, allowing heat to be transferred from the tube. The presence of several heat dissipation plates 33 and several guide plates 35 increases the heat dissipation area of ​​the heat-conducting plate 3, thereby improving the heat dissipation effect on the stainless steel tube and enabling it to cool down quickly to room temperature. This helps maintain the stability of the pressure sensor 7 reading. The exhaust fan 36 is activated to allow outside air to flow into the sleeve 34. After entering the sleeve 34, the outside air flows along the outer wall of the heat dissipation plates 33 and then along the inclined surface of the guide plates 35, thus removing heat from the stainless steel tube more quickly.

[0046] Specifically, the spray assembly includes a water storage chamber 26, which is located inside the base 1. Two liquid inlets 27 are symmetrically located on the outer wall of the base 1, both communicating with the water storage chamber 26. A fixing frame 22 is fixedly connected to the outer wall of the second nozzle 38, above the mounting plate 16. The fixing frame 22 is arc-shaped, and two first nozzles 23 are symmetrically fixedly connected to the inner wall of the fixing frame 22. Both first nozzles 23 are installed at an angle. Two water pumps 24 are symmetrically fixedly connected to the bottom of the fixing frame 22. The water pumps 24 deliver... The outlet is connected to a telescopic pipe 25. One end of the telescopic pipe 25 is connected to the first nozzle 23, and the other end of the telescopic pipe 25 passes through the liquid inlet 27 and extends into the interior of the water storage chamber 26. An electric telescopic rod 21 is fixedly connected to the bottom of the water tank 13. The output end of the electric telescopic rod 21 is fixedly connected to the fixed frame 22. Two discharge ports 28 are symmetrically opened on the top of the base 1. A filter screen 29 is fixedly connected to the inner wall of the discharge port 28. Two flow collectors 32 are symmetrically fixedly connected to the top of the heat conduction plate 3. Both flow collectors 32 are set to be arc-shaped.

[0047] Through the above technical solution, when detecting the connection between the pressure sensor 7 and the stainless steel pipe, the electric telescopic rod 21 is activated, controlling the fixing frame 22 to move downward, causing the second nozzle 38 to move downward. The second liquid inlet pipe 15 slides within the first liquid inlet pipe 14. After the second nozzle 38 moves downward, it drives the sponge 17 to move downward. The arc-shaped surface at the bottom of the sponge 17 fits against the outer wall of the stainless steel pipe, and the soap water sprayed from the second nozzle 38 seeps into the sponge 17. Applying the soap water through the sponge 17 prevents excessive dripping of soap water and facilitates more even application. Subsequently, the electric telescopic rod 21 controls the fixing frame 22 to move upward, separating the sponge 17 from the stainless steel pipe. Room temperature water is filled into the water storage chamber 26. After detecting that the connection between the pressure sensor 7 and the stainless steel pipe is tight, the water pump 24 is activated, pumping the room temperature water in the water storage chamber 26 along the telescopic pipe 25 to the first... At nozzle 23, water is sprayed out through the first nozzle 23. Since the first nozzle 23 is installed at an angle, the sprayed water flows downwards, making it easy to slide down the outer wall of the stainless steel pipe. This facilitates cleaning the soapy water at the connection between the pressure sensor 7 and the stainless steel pipe. The room temperature water sprayed under the nozzle re-enters the water storage chamber 26 through the discharge port 28, allowing the room temperature water to be recycled. When the air tightness test of the stainless steel pipe begins, room temperature water continues to be sprayed out through the first nozzle 23. At the same time, the first motor 10 controls the first nozzle 23 to move laterally, so that the first nozzle 23 sprays different positions of the stainless steel pipe. The spraying of room temperature water further accelerates the cooling of the stainless steel pipe. Under the wrapping of the two manifolds 32, some room temperature water can remain on the heat-conducting plate 3, continuously immersing the stainless steel pipe. The immersion environment can greatly improve the heat dissipation efficiency of the stainless steel pipe, making the inflation process closer to isothermal compression, thereby suppressing the temperature rise.

[0048] A sensor-based method for detecting the airtightness of stainless steel pipes, applicable to the aforementioned sensor-based device for detecting the airtightness of stainless steel pipes, comprises the following steps:

[0049] S1: Insert the first air intake pipe 4 into one end of the stainless steel pipe and connect it to the stainless steel pipe threadedly. Insert the pressure sensor 7 into the other end of the stainless steel pipe and connect it to the stainless steel pipe threadedly as well.

[0050] S2: Use the second nozzle 38 to spray soapy water at the connection between the pressure sensor 7 and the stainless steel pipe to determine whether there is air leakage at the connection between the pressure sensor 7 and the stainless steel pipe during the pre-test.

[0051] S3: Use the first nozzle 23 to spray room temperature water to clean the connection between the pressure sensor 7 and the stainless steel tube with soapy water, and spray the stainless steel tube to cool it down when inflating it.

[0052] In use, room temperature water is filled into the water storage chamber 26. A small amount of room temperature water is sprayed onto the heat-conducting plate 3 through the first nozzle 23 to lubricate the contact area between the heat-conducting plate 3 and the stainless steel tube, preventing damage to the outer wall of the stainless steel tube due to friction when rotating the heat-conducting plate 3, and avoiding the stainless steel tube from heating up due to friction, thereby ensuring the accuracy of the airtightness test. The stainless steel tube to be tested is placed on the heat-conducting plate 3, which supports the stainless steel tube for easy testing. The first air inlet pipe 4 is inserted into one end of the stainless steel tube and threaded into the stainless steel tube. The pressure sensor 7 is inserted into the other end of the stainless steel tube and threaded into the stainless steel tube as well. Soapy water is filled into the water tank 13. The first motor 10 is started, driving the lead screw 11 to rotate, causing the slide... Block 12 moves laterally, causing the water tank 13 to move laterally, which in turn moves the second nozzle 38 laterally. This controls the second nozzle 38 to move to the connection point between the pressure sensor 7 and the stainless steel pipe. The electric telescopic rod 21 is activated, controlling the fixing frame 22 to move downwards, causing the second nozzle 38 to move downwards. The second inlet pipe 15 slides within the first inlet pipe 14. After the second nozzle 38 moves downwards, it causes the sponge 17 to move downwards as well. The curved surface at the bottom of the sponge 17 fits against the outer wall of the stainless steel pipe. The soapy water in the water tank 13 flows along the first inlet pipe 14 and the second inlet pipe 15 to the second nozzle 38, where it is sprayed out. The soapy water sprayed from the second nozzle 38 seeps into the sponge 17, allowing the sponge 17 to apply the soapy water. This prevents excessive dripping of soapy water, ensuring more even application. Simultaneously, the second motor 18 is activated, driving the gear 19 to rotate, which in turn rotates the gear ring 20, causing the first air intake pipe 4 to rotate. This, in turn, rotates the stainless steel pipe and pressure sensor 7, allowing soapy water to be sprayed onto different locations at the connection between the pressure sensor 7 and the stainless steel pipe. After spraying, the electric telescopic rod 21 controls the fixing frame 22 to move upwards, separating the sponge 17 from the stainless steel pipe. Then, the first motor 10 controls the second nozzle 38 to move laterally, positioning it at the connection between the first air intake pipe 4 and the stainless steel pipe for further soapy water spraying. After the soapy water spraying is complete, the air pump 6 is activated, directing external air along the second air intake pipe 5 and... The first air intake pipe 4 is drawn into the stainless steel pipe. A pre-inspection is performed on the connection between the stainless steel pipe and the pressure sensor 7. By observing the changes in the soapy water, the inspector can determine if the connection between the pressure sensor 7 and the stainless steel pipe is tight, facilitating timely adjustment of the connection. The same procedure is followed for inspecting the connection between the first air intake pipe 4 and the stainless steel pipe. After confirming a tight connection, the water pump 24 is activated, drawing room-temperature water from the water storage chamber 26 along the telescopic pipe 25 to the first nozzle 23. The water is then sprayed out through the first nozzle 23. Because the first nozzle 23 is installed at an angle, the sprayed water flows downwards, facilitating its sliding down the outer wall of the stainless steel pipe, thus easily cleaning the soapy water at the connection between the pressure sensor 7 and the stainless steel pipe.Gas is introduced into the stainless steel tube by air pump 6 and maintained at pressure for a period of time. The airtightness of the stainless steel tube is judged by observing the change in the value of pressure sensor 7. The arc-shaped top of heat-conducting plate 3 is in contact with the outer wall of the stainless steel tube. The contact of heat-conducting plate 3 allows heat to be transferred from the stainless steel tube. The heat dissipation area of ​​heat-conducting plate 3 is increased by the setting of several heat dissipation plates 33 and several guide plates 35, thereby improving the heat dissipation effect on the stainless steel tube and enabling the stainless steel tube to cool down to room temperature quickly. This facilitates the maintenance of the stability of the value of pressure sensor 7. The exhaust fan 36 is started to ventilate, allowing outside air to flow into the sleeve 34. After entering the sleeve 34, the outside air flows along the outer wall of the several heat dissipation plates 33. As the airflow passes through the guide plate 35, it flows along the inclined surface of the guide plate 35, thereby quickly removing heat from the stainless steel pipe. While the airtightness test of the stainless steel pipe begins, room-temperature water continues to be sprayed through the first nozzle 23. Simultaneously, the first motor 10 controls the lateral movement of the first nozzle 23, allowing it to spray different positions on the stainless steel pipe. This spraying of room-temperature water further accelerates the cooling of the stainless steel pipe. Furthermore, under the protection of the two collector plates 32, some of the room-temperature water remains on the heat-conducting plate 3, continuously immersing the stainless steel pipe. This immersion environment significantly improves the heat dissipation efficiency of the stainless steel pipe, making the inflation process closer to isothermal compression, thereby suppressing temperature rise.

[0053] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0054] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sensor-based airtightness testing device for stainless steel pipes, comprising a base (1), a support plate (8) fixedly connected to the top of the base (1), a first air inlet pipe (4) rotatably connected to the inner wall of the support plate (8), a second air inlet pipe (5) rotatably connected to one end of the first air inlet pipe (4), an air pump (6) provided at one end of the second air inlet pipe (5), a hydraulic cylinder (30) fixedly connected to the top of the base (1) and the side away from the support plate (8), a sliding plate (31) fixedly connected to the output end of the hydraulic cylinder (30), the sliding plate (31) slidably connected to the base (1), and a pressure sensor (7) rotatably connected to the outer wall of the sliding plate (31), characterized in that, Also includes: Support components for supporting the pre-inspected stainless steel tubes; A spraying assembly is used to test the sealing performance of the connection between the pressure sensor (7) and the stainless steel tube; Rotating assembly, used to control the rotation of the stainless steel tube on the support assembly; Heat dissipation components are used to cool the stainless steel tubes during the airtightness testing process. Spray assembly for cleaning soapy water off stainless steel pipes; The spraying assembly includes a top plate (9), which is fixedly installed on the top of a support plate (8). A first motor (10) is fixedly connected to one side of the top plate (9). The output end of the first motor (10) extends into the interior of the top plate (9) and is fixedly connected to a lead screw (11). The lead screw (11) is rotatably connected to the top plate (9). A slider (12) is connected to the outer wall of the lead screw (11) through a lead screw nut pair. The slider (12) is slidably connected to the top plate (9). A water tank (13) is fixedly connected to the bottom of the slider (12). A first liquid inlet pipe (14) is fixedly connected to the inner wall of the water tank (13). A second liquid inlet pipe (15) is slidably connected to the inner wall of the first liquid inlet pipe (14). A second nozzle (38) is provided at the bottom of the second liquid inlet pipe (15). The rotating assembly includes a gear ring (20), which is fixedly installed on the outer wall of the first air intake pipe (4). A second motor (18) is fixedly connected to one side of the support plate (8). The output end of the second motor (18) extends into the interior of the support plate (8) and is fixedly connected to a gear (19). The gear (19) meshes with the gear ring (20). The spray assembly includes a water storage chamber (26) located inside the base (1). Two liquid inlets (27) are symmetrically located on the outer wall of the base (1), both of which communicate with the water storage chamber (26). A fixing frame (22) is fixedly connected to the outer wall of the second nozzle (38) above the mounting plate (16). The fixing frame (22) is arc-shaped, and two first nozzles (23) are symmetrically fixedly connected to the inner wall of the fixing frame (22). Both first nozzles (23) are installed at an angle. The bottom of the fixing frame (22) is symmetrically fixed... Two water pumps (24) are fixedly connected. The output end of the water pumps (24) is connected to a telescopic pipe (25). One end of the telescopic pipe (25) is connected to the first nozzle (23). The other end of the telescopic pipe (25) passes through the liquid inlet (27) and extends into the interior of the water storage chamber (26). An electric telescopic rod (21) is fixedly connected to the bottom of the water tank (13). The output end of the electric telescopic rod (21) is fixedly connected to the fixed frame (22). Two discharge ports (28) are symmetrically opened on the top of the base (1). A filter screen (29) is fixedly connected to the inner wall of the discharge port (28).

2. The sensor-based airtightness detection device for stainless steel pipes according to claim 1, characterized in that, The support assembly includes two sets of brackets (2), which are symmetrically fixedly installed on the top of the base (1). A heat-conducting plate (3) is fixedly connected between the two sets of brackets (2), and the top of the heat-conducting plate (3) is set to be arc-shaped.

3. The sensor-based airtightness detection device for stainless steel pipes according to claim 2, characterized in that, The outer wall of the second nozzle (38) is fixedly connected to an installation plate (16), and the bottom of the installation plate (16) is fixedly connected to a sponge (17), the bottom of which is arc-shaped.

4. The sensor-based airtightness detection device for stainless steel pipes according to claim 3, characterized in that, The heat dissipation assembly includes a sleeve (34) which is located below the heat-conducting plate (3). Several heat dissipation plates (33) are fixedly connected at equal intervals on the inner wall of the sleeve (34). The heat dissipation plates (33) are fixedly connected to the heat-conducting plate (3). An exhaust fan (36) is fixedly connected to one side of the sleeve (34). An exhaust pipe (37) is connected to the output end of the exhaust fan (36). One end of the exhaust pipe (37) extends into the interior of the sleeve (34).

5. The sensor-based airtightness detection device for stainless steel pipes according to claim 4, characterized in that, The outer wall of the heat sink (33) is fixedly connected with several sets of guide plates (35) at equal intervals. The guide plates (35) are installed at an angle, and the angles of adjacent sets of guide plates (35) are opposite.

6. The sensor-based airtightness detection device for stainless steel pipes according to claim 5, characterized in that, The top of the heat-conducting plate (3) is symmetrically fixedly connected to two flow collectors (32), both of which are arc-shaped.

7. A sensor-based method for detecting the airtightness of stainless steel pipes, applicable to the sensor-based stainless steel pipe airtightness detection device described in claim 6, characterized in that: The steps of this detection method are as follows: S1: Insert the first intake pipe (4) into one end of the stainless steel pipe and connect it to the stainless steel pipe by thread. Insert the pressure sensor (7) into the other end of the stainless steel pipe and connect it to the stainless steel pipe by thread as well. S2: Use the second nozzle (38) to spray soapy water at the connection between the pressure sensor (7) and the stainless steel pipe to determine whether there is air leakage at the connection between the pressure sensor (7) and the stainless steel pipe during the pre-test. S3: Use the first nozzle (23) to spray room temperature water to clean the connection between the pressure sensor (7) and the stainless steel pipe with soapy water, and spray the stainless steel pipe to cool it down when inflating it.

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