Liquefied cold box sealing performance testing device and method

Abstract

The invention relates to the technical field of liquefied cold box testing, discloses a liquefied cold box sealing performance testing device and method, and solves the problem of low testing precision. The liquefied cold box sealing performance testing device comprises a liquefied cold box shell, a testing vehicle is arranged at the top of the liquefied cold box shell, a negative pressure disc is arranged outside each moving ball, and a sliding strip is arranged in the testing vehicle; a plurality of sealing strips are arranged on the base, a sealing disc is arranged inside the plurality of sealing strips, a testing disc is arranged at the bottom of the sealing disc, a high-precision thermal infrared imager is fixed at the bottom of the testing disc, a positioning pipe is fixed at the rear end of the high-precision thermal infrared imager, a thermal conductivity sensor is fixed inside the positioning pipe, and a marking pen is arranged outside the positioning pipe; according to the device, the test vehicle ascends and descends, so that to-be-tested objects in different shapes can be conveniently adapted, meanwhile, the inclination angle of the movable ball can be changed through movement of the adaption plate and further rotation of the connecting block, the movable ball can be tightly attached to the to-be-tested object, and therefore the precision in the sealing performance test process is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of liquefied cold box testing technology, specifically a device and method for testing the sealing performance of a liquefied cold box. Background Technology

[0002] As a core device for cryogenic fluid storage and processing, the sealing performance of a liquefied liquid cold box directly determines the system's energy efficiency and operational safety. The cold box typically contains a large amount of nitrogen gas; even a minor nitrogen leak can lead to loss of cooling capacity, equipment frost formation, or even an explosion risk. Therefore, regular sealing tests are usually required when using liquefied liquid cold boxes to ensure the safety of the entire system.

[0003] However, most existing testing devices can only be adapted to one shape, thus only testing the surface of the cold box. At the same time, since most existing testing devices require a lot of manual assistance, the testing accuracy is low, resulting in poor testing results. To address these issues, this invention proposes a testing device and method for the sealing performance of liquefied cold boxes. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a liquefied cold box sealing performance testing device and method, which effectively solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquefied cold box sealing performance testing device, comprising a liquefied cold box shell, a test carriage on the top of the liquefied cold box shell, a plurality of ball lifting rods at both ends of the test carriage, a movable ball at the bottom of each ball lifting rod, a negative pressure plate outside each movable ball, a plurality of sliding grooves fixed on the test carriage, a sliding strip slidably connected inside each sliding groove, a sealing strip fixed inside each sliding strip, a sealing rod at the top of each sliding strip, a sealing plate inside each of the sealing strips, a vacuum pump at the top of the sealing plate, and a vacuum pump at the bottom of the sealing plate. The device includes an adjustable motor with a rotatable groove at its bottom. A test plate is located at the bottom of the rotatable groove, and a high-precision infrared thermal imager is fixed to the bottom of the test plate. A positioning tube is fixed to the rear end of the high-precision infrared thermal imager, and a marking gear is fixed to the outside of the positioning tube. A thermal conductivity sensor is fixed inside the positioning tube, and a proximity plate is located outside the positioning tube. A proximity rod is fixed to the bottom of the proximity plate, and a clamping plate is located at the bottom of the proximity rod. A protective spring is fixed to the bottom of the clamping plate, and a protective plate is fixed to the bottom of the protective spring. Several clamping rods are located at the bottom of the clamping plate, and a marking pen is located inside each of the clamping rods.

[0006] Preferably, an insulation layer is fixed inside the outer shell of the liquefied cold box, a heat exchanger is fixed inside the insulation layer, a heat exchange tube is fixed inside the heat exchanger, and several connecting pipes are fixed outside the heat exchange tube. A mobile camera is fixed to the left end of the test vehicle, a battery is fixed to the bottom right end of the test vehicle, and a controller is fixed to the rear end of the battery.

[0007] Preferably, the test vehicle has two sets of adapter rods fixed to its top. Each set of adapter rods has an adapter plate fixed to its outer bottom. Each adapter plate has several hinge blocks fixed to its bottom. Each hinge block has a connecting block hinged inside. Each connecting block is fixedly connected to the ball lifting rod at its bottom. Each rightmost hinge block has an angle adjustment motor fixed to its exterior. The angle adjustment motor is rotatably connected to the connecting block at one end of its shaft. Each ball lifting rod has a moving ball positioning plate fixed to its bottom. Each moving ball positioning plate is hinged to the moving ball inside its interior. Each moving ball positioning plate has a moving motor fixed to its inner side. Each moving motor is rotatably connected to the moving ball at one end of its interior. Each moving ball positioning plate is fixedly connected to the negative pressure plate outside its exterior. Each negative pressure plate has a negative pressure motor fixed inside its interior. Each negative pressure motor has a negative pressure fan rotatably connected to its bottom.

[0008] Preferably, the test vehicle has several support frames fixed on its top, and a support plate is fixed on the top of each support frame. The support plate is fixedly connected to the sealing rod at its bottom. A pressure sensor is fixedly fixed at the bottom of each sealing rod. Each pressure sensor is fixedly connected to the slide bar at its bottom. A sealing plate is fixedly fixed at the bottom of each slide bar.

[0009] Preferably, each of the sealing strips has a slider at one end and a slide rail fixed at the other end. Each slide rail is in close contact with the slider outside it. A sealing disc moving rod is also fixed at the bottom of the support plate, and the bottom of the sealing disc moving rod is fixedly connected to the sealing disc.

[0010] Preferably, a vacuum valve is fixed to the top of the sealing disc, the vacuum valve is fixedly connected to the vacuum pump through a pipe, the sealing disc is provided with an air outlet, a pressure sensor is also fixed to the sealing disc, and a sealing ring is fixed to the outside of the sealing disc, the sealing ring being tightly fitted with the sealing strip.

[0011] Preferably, the moving groove is provided with a positioning groove, a test wheel is slidably connected inside the moving groove, the rotating shaft of the test wheel is slidably connected to the positioning groove, a test disk positioning strip is hinged to the outer end of the rotating shaft of the test wheel, a test motor is fixed to the right end of the test disk positioning strip, the test motor is rotatably connected to the test wheel, the bottom of the test disk positioning strip is fixedly connected to the test disk, an industrial camera is also fixed to the bottom of the test disk, and a lighting lamp is fixed to the right end of the industrial camera.

[0012] Preferably, a marking motor is also fixed to the bottom of the test disk, a marking main gear is rotatably connected to the bottom of the marking motor, a bearing is fixed to the bottom of the marking main gear, the outer ring of the bearing is fixedly connected to the contact plate at its bottom, a clamping block is fixed to the bottom of the contact rod, the clamping block is fixedly connected to the clamping disk at its bottom, several clamping rods are fixed to the outside of the clamping block, a clamping head is fixed to the outside of each clamping rod, each clamping head is fixedly connected to the clamping rod at its bottom, an anti-slip block is fixed inside each clamping rod, each anti-slip block is tightly fitted to the marking pen inside, and several clamping slots are provided on the clamping disk, each clamping slot is slidably connected to the clamping head inside.

[0013] Preferably, a positioning ring is fixed to the rear end of the clamping disk, the positioning ring is slidably connected to the positioning tube, a lower end slide groove is fixed to the outside of the positioning tube, a lower end slide ring is slidably connected inside the lower end slide groove, the lower end slide ring is fixedly connected to the contact disk at its front end, the marking main gear is meshed with the marking secondary gear, the top of the marking secondary gear is provided with an upper end slide groove and is fixedly connected to the positioning tube, an upper end slide ring is slidably connected inside the upper end slide groove, and the upper end slide ring is fixedly connected to the marking motor at its front end.

[0014] The present invention also provides a method for testing the sealing performance of a liquefied cold box, based on the sealing performance testing device for a liquefied cold box as described above, comprising the following steps: Step 1: When using this device, the staff places the test vehicle on top of the liquefied cold box shell. At this time, the device communicates with the external display terminal through the controller's communication module, and the movement can be observed through the moving camera. Step 2: The controller controls several negative pressure fans to produce negative pressure, allowing the test vehicle to move vertically. The adapter board can control the movement of the entire test vehicle via a moving ball, and the adapter rod can move the adapter board. At the same time, the angle adjustment motor drives the connecting block to rotate, and the extension and retraction of the ball lifting rod can move the moving ball, thereby changing the angle of the ball lifting rod. This allows the test vehicle to move along the curved surface, facilitating the testing of the connecting pipe. Step 3: When the test vehicle moves to the required test position, the controller controls several sealing rods to work together, thereby driving several sliding strips to descend, so that several sealing plates are in close contact with the outer shell of the liquefied cold box. At this time, the pressure sensor can determine the degree of contact, and the sealing strips can seal the seal between the sealing strips and the outer shell of the liquefied cold box. Step 4: The controller further controls the vacuum pump and vacuum valve to work together to start the evacuation operation. At this time, the air inside the sealing strip is extracted. The controller can monitor the air pressure at the bottom of the sealing plate through the air pressure sensor. If this area is completely sealed, the air pressure sensor value shows that the bottom of the sealing plate is vacuum. If there is a leak, the air pressure sensor value will change in real time, thus determining that this area is not sealed. At the same time, the nitrogen inside the liquefied cold box will leak. Step 5: If not sealed, the controller controls the adjustment motor and the test motor to work together, which can move the test plate to any position at the bottom of the sealing plate. The controller further controls the high-precision infrared thermal imager to collect the temperature field of the outer wall of the liquefied cold box in real time. The data fusion terminal generates a dynamic temperature cloud map and automatically identifies "low-temperature abnormal spots" through the terminal algorithm. This abnormal spot area is recorded as a suspected leak point. The controller further controls the sealing plate moving rod, the adjustment motor and the test motor to work together to move the positioning tube to this abnormal spot area. Step Six: At this point, the controller moves to any position in this area via the thermal conductivity sensor, thereby determining the specific location of the leak based on the nitrogen concentration detected by the thermal conductivity sensor. The controller then controls the proximity rod to make the marking pen press against the outer shell of the liquefied cold box. At this time, the controller controls the marking motor to make the main marking gear rotate around the secondary marking gear, thereby completing the marking work. The protective spring prevents the marking pen from being damaged. Step 7: If the marker pen needs to be replaced, the controller can move the clamping head via the clamping rod to release the marker pen, making it easy to replace. Step 8: If "low-temperature abnormal spots" are found, but the test results show that the liquefied cold box shell is well sealed, the entire device is judged to have a leak in the heat exchange tube. At this time, the staff opens the test connection pipe and places the test cart inside the heat exchange tube. The above operation is repeated to test whether the inner wall is leaking, thereby ensuring the test effect and improving the test accuracy.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This device can drive the test carriage to rise and fall by extending and retracting the ball lifting rod, so as to easily adapt to the test objects of different shapes. At the same time, the adapter plate can be moved by extending and retracting the adapter rod. Furthermore, the connecting block can be rotated by the angle adjustment motor, so as to change the tilt angle of the moving ball, so that the moving ball can be closely attached to the test object, thereby ensuring the accuracy of the sealing test and ensuring the test effect. At the same time, since the negative pressure motor can drive the negative pressure fan to rotate, a negative pressure is formed between the test carriage and the outer shell or connecting pipe of the liquefied cold box, thereby ensuring that the test carriage can move in the vertical direction, thereby further ensuring the test effect. (2) This device uses a groove to position the slide bar. A layer of rubber material is fixed on the outside of the sealing bar, so that several sealing bars are sealed together, thereby ensuring the sealing performance of the bottom of the sealing plate, thus ensuring the air extraction accuracy, thus ensuring the sealing performance test accuracy, thus ensuring the test effect. At the same time, due to the action of the slider and the slider, the sealing performance between several sealing bars can be ensured, and the stability of the sealing bar when it moves can be ensured, thus further ensuring the test effect. (3) This device can drive the slide bar to rise and fall by extending and retracting the sealing rod, thereby allowing the sealing plate to rise and fall, so that the lower ends of several slide bars can form different shapes. This allows the outer shell of the liquefied cold box to be tested while the connecting pipe is also measured, thereby increasing the scope of use of the entire device and ensuring the test effect. At the same time, this device can extract the gas at the bottom of the sealing plate by using a vacuum pump and a vacuum valve, thus facilitating the test of sealing performance. (4) This device can drive the moving trough to rotate by adjusting the motor. The moving trough is used to position the test wheel. The high-precision infrared thermal imager collects the temperature field of the outer wall of the liquefied cold box in real time. The dynamic temperature cloud map is generated by the data fusion terminal. The terminal algorithm automatically identifies the "low temperature abnormal spot". The thermal conductivity sensor can determine the specific leak point by monitoring the nitrogen concentration, thereby ensuring the accuracy of the sealing performance test. The two work together to accurately determine the location of the leak point, which facilitates the subsequent maintenance work, thereby improving the safety of the whole device and the service life of the whole device. (5) This device can drive the clamping plate to rise and fall by extending and retracting the proximity rod, so that the marking pen is in close contact with the outer shell of the liquefied cold box, thus facilitating marking. At the same time, since the marking motor can drive the marking main gear to rotate around the marking secondary gear, the marking pen can mark around the positioning tube. Furthermore, the lower sliding groove, lower sliding ring, upper sliding groove and upper sliding ring can ensure the stability of the marking pen when marking. Furthermore, since the clamping rod can drive the clamping head to move, the clamping rod can move, thus ensuring the stability of the marking pen. At the same time, the protective plate and protective spring can prevent the marking pen from being damaged, thus ensuring the safety of the marking pen. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall device; Figure 2 This is a schematic cross-sectional view of the entire device; Figure 3 This is a schematic diagram of the test vehicle for this device; Figure 4This is a schematic diagram of the bottom of the test vehicle for this device; Figure 5 This is a top-view schematic diagram of the test vehicle for this device; Figure 6 This is a schematic diagram of the top of the test vehicle for this device; Figure 7 This is a schematic diagram of the bottom of the ball lifting rod of this device; Figure 8 This is a schematic diagram of the sealing rod of this device; Figure 9 This is a schematic diagram of the slider of this device; Figure 10 This is a cross-sectional view of the sealing strip of this device; Figure 11 This is a schematic diagram of the bottom of the adjusting motor of this device; Figure 12 This is a schematic diagram of the chute of this device; Figure 13 This is a schematic diagram of the bottom of the test panel of this device; Figure 14 This is a schematic diagram of the external positioning tube of this device; Figure 15 This is a schematic diagram of the auxiliary gear of this device; Figure 16 This is a cross-sectional view of the positioning tube of this device; Figure 17 This is a schematic diagram of the top of the marking pen in this device; Figure 18 This is a schematic diagram of the bottom of the clamping plate of this device.

[0018] In the diagram: 1-Liquefied gas cooler shell; 2-Test vehicle; 3-Ball lifting rod; 4-Support frame; 5-Sealing disc; 6-Adjusting motor; 7-Test disc; 8-Positioning tube; 9-Marking pen; 101-Connecting pipe; 102-Insulation layer; 103-Heat exchanger; 104-Heat exchange tube; 201-Moving camera; 202-Adapter rod; 203-Adapter board; 204-Controller; 205-Battery; 301-Connecting block; 302- Angle adjustment motor; 303-Negative pressure plate; 304-Negative pressure motor; 305-Negative pressure fan; 306-Moving ball; 307-Moving ball positioning plate; 308-Moving motor; 309-Hinge block; 401-Support plate; 402-Sealing rod; 403-Sealing plate moving rod; 404-Pressure sensor; 405-Sliding strip; 406-Sealing plate; 407-Slide groove; 408-Slider; 409-Slide rail; 410-Sealing strip 501-Vacuum pump; 502-Vacuum valve; 503-Pressure sensor; 504-Sealing ring; 505-Outlet; 601-Moving groove; 602-Positioning groove; 603-Test motor; 604-Test wheel; 605-Test disc positioning strip; 701-High-precision infrared thermal imager; 702-Industrial camera; 703-Lighting lamp; 801-Thermal conductivity sensor; 802-Positioning ring; 803-Lower end slide groove; 804 - Lower slip ring; 805 - Upper slide groove; 806 - Upper slip ring; 807 - Marked secondary gear; 808 - Marked main gear; 809 - Marked motor; 810 - Bearing; 901 - Clamping disc; 902 - Clamping rod; 903 - Anti-slip block; 904 - Clamping groove; 905 - Clamping head; 906 - Proximity rod; 907 - Proximity disc; 908 - Clamping rod; 909 - Clamping block; 910 - Protective spring; 911 - Protective disc. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1, by Figure 1 , Figures 3-4 , Figure 8 , Figures 10-12 , Figure 14 , Figure 17The present invention discloses a liquefied cold box sealing performance testing device, comprising a liquefied cold box shell 1 made of alloy material, a test carriage 2 made of alloy material on the top of the liquefied cold box shell 1, the test carriage 2 supporting the support frame 4, and several ball-rolling lifting rods 3 at both ends of the test carriage 2. The ball-rolling lifting rods 3 are telescopic, thereby driving the test carriage 2 to rise and fall, thus facilitating adaptation to test objects of different shapes. Each ball-rolling lifting rod 3 has a movable ball 306 at its bottom, the movable ball 306 being made of rubber material. The movable ball 306 ensures the stability of the test carriage 2 during movement and adapts to test objects of different shapes. 06 An external negative pressure plate 303 is provided, which is used to position the negative pressure motor 304. Several sliding grooves 407 are fixed on the test vehicle 2. The sliding grooves 407 are made of alloy material and are used to position the sliding strips 405. A sliding strip 405 is slidably connected inside each sliding groove 407. The sliding strip 405 is made of alloy material, and a layer of rubber material is fixed to the outside of each sliding strip 405, thereby sealing the sliding strips 405 together and between the sliding strip 405 and the sliding groove 407. A sealing strip 410 is fixed inside each sliding strip 405. The sealing strip 410 is made of alloy material, and a layer of rubber material is fixed to the outside of the sealing strip 410, thereby sealing the sliding strips 405 together. The sealing strips 410 are sealed together to ensure the sealing performance of the bottom of the sealing plate 5, thereby ensuring the air extraction accuracy, the sealing performance test accuracy, and the test effect. Each slide bar 405 has a sealing rod 402 at its top, which is telescopic and can drive the slide bar 405 to rise and fall, thereby allowing the sealing plate 406 to rise and fall. This allows the lower ends of several slide bars 405 to form different shapes, so that the liquefied cold box shell 1 can be tested while the connecting pipe 101 is measured, thereby improving the application range of the entire device and ensuring the test effect. Each of the several sealing strips 410 has a sealing plate 5 inside, which is made of alloy material and is used for positioning. The vacuum pump 501 ensures the stability of the sealing strip 410. A vacuum pump 501 is located at the top of the sealing disc 5. The vacuum pump 501, in conjunction with the vacuum valve 502, can pump gas from the bottom of the sealing disc 5 to the top, facilitating testing. An adjusting motor 6 is fixed to the bottom of the sealing disc 5, driving the moving groove 601 to rotate. The moving groove 601, made of alloy material, is rotatably connected to the bottom of the adjusting motor 6 and is used to position the test wheel 604. A test disc 7, also made of alloy material, is located at the bottom of the moving groove 601 and is used to position the high-precision infrared thermal imager 701.A high-precision infrared thermal imager 701 is fixed to the bottom of the test pan 7. The high-precision infrared thermal imager 701 collects the temperature field of the outer wall of the liquefied cold box 1 in real time. The data fusion terminal generates a dynamic temperature cloud map, and further automatically identifies "low-temperature abnormal spots" through the terminal algorithm. A positioning tube 8 is fixed to the rear end of the high-precision infrared thermal imager 701. The positioning tube 8 is made of alloy material and is used to position the thermal conductivity sensor 801. A marking gear 807 is fixed to the outside of the positioning tube 8. 07 provides a rotation path for the main gear 808. A thermal conductivity sensor 801 is fixed inside the positioning tube 8. The thermal conductivity sensor 801 can determine the specific leak point by monitoring the nitrogen concentration, thereby ensuring the accuracy of the sealing performance test. A proximity disc 907 is provided outside the positioning tube 8. The proximity disc 907 is made of alloy material and is used to position the proximity rod 906. The proximity rod 906 is fixed to the bottom of the proximity disc 907 and is telescopic, thereby driving the clamp. The holding plate 901 is raised and lowered, allowing the marking pen 9 to fit snugly against the surface of the liquefied cold box shell 1 and the connecting pipe 101, thus facilitating marking. A clamping plate 901, made of alloy material, is located at the bottom of the contact rod 906. The clamping plate 901 is used to position the clamping head 905. A protective spring 910 is fixed to the bottom of the clamping plate 901. The protective spring 910 is elastic, allowing the protective plate 911 to move, thus ensuring that the marking pen 9 fits snugly against the liquefied cold box shell 1 while preventing... To prevent damage to the marker pen 9 and ensure its safety, a protective plate 911 is fixed to the bottom of the protective spring 910. The protective plate 911 is made of alloy material and supports the marker pen 9. Several clamping rods 902, also made of alloy material, are provided at the bottom of the clamping plate 901 to hold the marker pen 9. The marker pen 9 is a common marker pen, designed for convenient marking.

[0021] Example 2, based on Example 1, is... Figure 2 , Figure 7As provided, the liquefied gas cooling box shell 1 has an insulation layer 102 fixed inside for heat insulation. A heat exchanger 103 is fixed inside the insulation layer 102 to facilitate heat exchange with the heat exchange tube 104. The heat exchange tube 104, made of alloy material, is fixed inside the heat exchanger 103 and is used to hold the required nitrogen gas. Several connecting pipes 101 are fixed outside the heat exchange tube 104 for easy connection to external parts. A mobile camera 201 is fixed to the left end of the test vehicle 2 to monitor its movement. A battery 205 is fixed to the bottom right end of the test vehicle 2. The test vehicle 2 provides the necessary electrical energy. A controller 204 is fixed to the rear end of the battery 205, controlling the entire device. Two sets of adapter rods 202 are fixed to the top of the test vehicle 2. These adapter rods 202 are telescopic, allowing the adapter plate 203 to move, thereby increasing the angle adjustment range of the ball lifting rod 3 and thus expanding the overall usability of the device. An adapter plate 203, made of alloy material, is fixed to the bottom of the outer end of each set of adapter rods 202. The adapter plate 203 supports the hinge block 309. Several hinge blocks 309, also made of alloy material, are fixed to the bottom of each adapter plate 203 for positioning the... A connecting block 301 is hinged inside each of the hinge blocks 309. The connecting block 301 is made of alloy material and is used to position the ball lifting rod 3. Each connecting block 301 is fixedly connected to the ball lifting rod 3 at its bottom. An angle adjustment motor 302 is fixedly fixed to the outside of each hinge block 309 at the far right end. The angle adjustment motor 302 can drive the connecting block 301 to rotate, thereby changing the angle of the ball lifting rod 3, so as to adapt to test objects of different shapes. The angle adjustment motor 302 is rotatably connected to the connecting block 301 at one end through a rotating shaft. A movable ball positioning plate 307 is fixed at the bottom of each ball lifting rod 3. 07 is made of alloy material. The moving ball positioning plate 307 is used to position the moving ball 306. Each moving ball positioning plate 307 is hinged to the moving ball 306 inside it. A moving motor 308 is fixed inside each moving ball positioning plate 307. The moving motor 308 can drive the moving ball 306 to rotate, thereby enabling the test vehicle 2 to move and change direction. Each moving motor 308 is rotatably connected to the moving ball 306 at one end. Each moving ball positioning plate 307 is fixedly connected to the negative pressure plate 303 outside it. A negative pressure motor 304 is fixed inside each negative pressure plate 303. The negative pressure motor 304 can drive the negative pressure fan 305 to rotate, thereby forming negative pressure.This allows the test vehicle 2 to move vertically, thereby increasing the overall usability of the device. Each negative pressure motor 304 is rotatably connected to a negative pressure fan 305 at its bottom. When using this device, the operator places the test vehicle 2 on top of the liquefied cold box shell 1. The controller 204 communicates with an external display terminal via its communication module, and the movement can be observed via the mobile camera 201. The controller 204 controls several negative pressure motors 304 to operate, which in turn drives the negative pressure fan 305 to generate negative pressure, allowing the test vehicle 2 to move vertically. Furthermore, the adapter plate 203, through the mobile motor 308, rotates the mobile ball 306, controlling the movement of the entire test vehicle 2. The adapter rod 202 moves the adapter plate 203, and the angle adjustment motor 302 rotates the connecting block 301. The extension and retraction of the ball lifting rod 3 moves the mobile ball 306, changing its angle and allowing the test vehicle 2 to move along a curved surface. This facilitates testing of the connecting pipe 101 and any position within the cold box, ensuring optimal testing results.

[0022] Example 3, based on Example 1, is... Figures 5-6 , Figure 9As shown, the test vehicle 2 has several support frames 4 fixed on its top. These support frames 4 are made of alloy material and support the support plate 401. Each support frame 4 has a support plate 401 fixed to its top. The support plate 401 is also made of alloy material and positions the sealing rod 402. The support plate 401 is fixedly connected to the sealing rod 402 at its bottom. Each sealing rod 402 has a pressure sensor 404 fixed to its bottom. The pressure sensor 404 determines the pressure by monitoring the force applied to the sliding strip 405. The test determines whether the slide bar 405 is sealed to the liquefied cold box shell 1 and the connecting pipe 101, thereby ensuring the accuracy of the sealing performance test. Each pressure sensor 404 is fixedly connected to the slide bar 405 at its bottom. A sealing plate 406 is fixed to the bottom of each slide bar 405. The sealing plate 406 is made of rubber material and can ensure the sealing performance between the slide bar 405 and the liquefied cold box shell 1. Each sealing bar 410 has a slider 408 at one end and a slide rail 409 fixed at the other end. 09 is made of alloy material. A layer of rubber material is fixed to the outside of the slide rail 409. The slider 408 and the slide rail 409 cooperate to ensure the sealing performance of two adjacent sealing strips 410, thereby ensuring the test effect. Each slide rail 409 is tightly fitted with its external slider 408. A sealing disc moving rod 403 is also fixed to the bottom of the support plate 401. The sealing disc moving rod 403 is telescopic, thereby driving the sealing disc 5 to rise and fall. The bottom of the sealing disc moving rod 403 is fixedly connected to the sealing disc 5. A vacuum valve is fixed to the top of the sealing disc 5. Vacuum valve 502 is fixedly connected to vacuum pump 501 via a pipe. Air outlet 505 is provided on the sealing disc 5 for easy air extraction. A pressure sensor 503 is also fixed on the sealing disc 5 to monitor the air pressure at the bottom of the sealing disc 5. A sealing ring 504, made of rubber, is fixed to the outside of the sealing disc 5 to ensure the sealing performance between the sealing disc 5 and the sealing strip 410. The sealing ring 504 fits tightly against the sealing strip 410. Furthermore, when the test vehicle 2 moves to the required test position, the controller 204 controls several sealing rods 402 to work together, thereby causing several sliding bars 405 to descend, so that several sealing plates 406 are in close contact with the outer shell 1 of the liquefied cold box. At this time, the pressure sensor 404 can determine the degree of contact. At this time, the sealing strips 410 can seal between the sealing strips 410 and the outer shell 1 of the liquefied cold box. At the same time, the slider 408 and the slide rail 409 can seal between the sealing strips 410, thereby ensuring the accuracy of the cold box sealing test. Since several sliding bars 405 work independently, the entire device can be adapted to cold boxes of different shapes, thus allowing testing of the connecting pipes on the cold box. 101, thus ensuring test accuracy, the controller 204 further controls the vacuum pump 501 and the vacuum valve 502 to work together to start the evacuation operation, thereby transporting the gas at the bottom of the sealing plate 5 to the top of the sealing plate 5 through the air outlet 505. At this time, the air pressure at the bottom of the sealing plate 5 can be monitored by the vacuum valve 502. At this time, the air inside the sealing strip 410 is extracted. If this area is completely sealed, the value of the air pressure sensor 503 shows the vacuum at the bottom of the sealing plate 5. If there is a leak, the value of the air pressure sensor 503 will change in real time, thereby judging that this area is not sealed. At the same time, the nitrogen inside the liquefied cold box shell 1 will leak. At this time, due to the action of the vacuum valve 502 and the vacuum pump 501, the nitrogen leakage rate can be increased, thus facilitating the test.

[0023] Example 4, based on Example 1, is... Figure 13 , Figures 15-16 , Figure 18The movable groove 601 is provided with a positioning groove 602, which is used to position the rotating shaft of the test wheel 604. The test wheel 604, made of rubber material, is slidably connected inside the movable groove 601. The test wheel 604 can move along the movable groove 601 by rotation, thereby facilitating the movement of the test disk 7. The rotating shaft of the test wheel 604 is slidably connected to the positioning groove 602. A test disk positioning strip 605, made of alloy material, is hinged to the outer end of the rotating shaft of the test wheel 604. The test disk positioning strip 605 is used to connect the test wheel 604 and the test disk 7. A test motor is fixed to the right end of the test disk positioning strip 605. 603, the test motor 603 can drive the test wheel 604 to rotate, the test motor 603 is rotatably connected to the test wheel 604, the bottom of the test disk positioning strip 605 is fixedly connected to the test disk 7, an industrial camera 702 is also fixedly fixed to the bottom of the test disk 7, the industrial camera 702 is used to monitor the environment at the bottom of the sealed disk 5, an illumination lamp 703 is fixed to the right end of the industrial camera 702, the illumination lamp 703 provides the necessary illumination for the industrial camera 702, a marking motor 809 is also fixedly fixed to the bottom of the test disk 7, the marking motor 809 can drive the marking main gear 808 to rotate, so that the marking main gear 808 can rotate along the marking secondary gear 807, thereby making the marking The pen 9 rotates around the positioning tube 8 to ensure the marking effect. A marking main gear 808 is rotatably connected to the bottom of the marking motor 809. A bearing 810 is fixed to the bottom of the marking main gear 808, connecting the marking main gear 808 and the proximity disc 907. The outer ring of the bearing 810 is fixedly connected to the proximity disc 907 at its bottom. A clamping block 909, made of alloy material, is fixed to the bottom of the proximity rod 906. The clamping block 909 is used to position the clamping rod 908 and is fixedly connected to the clamping disc 901 at its bottom. Several clamping rods 908 are fixed to the outside of the clamping block 909 and are retractable. The clamping head 905 can be moved along the clamping groove 904, thereby clamping the marker pen 9 while facilitating its removal. Each clamping rod 908 has a clamping head 905 fixed externally. The clamping head 905 is made of alloy material and is used to position the clamping rod 902. Each clamping head 905 is fixedly connected to the clamping rod 902 at its bottom. Each clamping rod 902 has an anti-slip block 903 fixed inside. The anti-slip block 903 is made of rubber material and ensures the stability of the marker pen 9. Each anti-slip block 903 fits tightly against the marker pen 9 inside. The clamping disc 901 has several clamping grooves 904.The clamping groove 904 is used to position the clamping head 905. Each clamping groove 904 is slidably connected to the clamping head 905 inside it. A positioning ring 802 is fixed to the rear end of the clamping disk 901. The positioning ring 802 is made of alloy material. The positioning ring 802 is used to position the clamping disk 901, thereby ensuring the stability of the marking pen 9 during marking. The positioning ring 802 is slidably connected to the positioning tube 8. A lower end slide groove 803 is fixed to the outside of the positioning tube 8. The lower end slide groove 803 is made of alloy material. The lower end slide groove 803 is used to position the lower end slide ring 804. The lower end slide ring 804 is slidably connected inside the lower end slide groove 803. The lower end slide ring 804 is made of alloy material. The lower slip ring 804 is used to position the contact plate 907. The lower slip ring 804 is fixedly connected to the contact plate 907 at its front end. The marking main gear 808 meshes with the marking secondary gear 807. The top of the marking secondary gear 807 is provided with an upper sliding groove 805, which is fixedly connected to the positioning tube 8. The upper sliding groove 805 is made of alloy material and is used to position the upper slip ring 806. The upper slip ring 806, made of alloy material, is slidably connected inside the upper sliding groove 805 and is used to position the marking motor 809. The upper slip ring 806 is fixedly connected to the marking motor 809 at its front end. If the entire liquefied cooling box is not sealed, the controller 204 controls the adjusting motor 6 to rotate the moving groove 601, and further uses the test motor 603 to move the test wheel 604 along the moving groove 601, thereby moving the test disk 7 along the moving groove 601, allowing the test disk 7 to move to any position at the bottom of the sealing disk 5. The controller 204 then controls the high-precision infrared thermal imager 701 to collect the temperature field of the outer wall of the liquefied cooling box shell 1 in real time, and generates a dynamic temperature cloud map through a data fusion terminal. The terminal algorithm automatically identifies "low-temperature abnormal spots," recording these abnormal spot areas as suspected leak points. The controller 204 then controls the sealing disk moving rod 403, the adjusting motor 6, and the test motor 603 to coordinate and move the positioning tube 8 to this abnormal spot area. At this time, the controller 204 uses the thermal conductivity sensor... The device 801 moves to any position within this area, allowing the specific leak location to be determined based on the nitrogen concentration detected by the thermal conductivity sensor 801. Further, the controller 204 controls the extension of the proximity rod 906, causing the marking pen 9 to adhere tightly to the liquefied gas cooling box shell 1. At this time, the controller 204 controls the marking motor 809 to rotate the marking main gear 808 around the marking secondary gear 807, thus completing the marking work. Due to the action of the protective spring 910, the marking pen 9 can move upwards when encountering a protrusion, preventing damage to the marking pen 9. After marking is completed in this area, the controller 204 controls the test vehicle 2 to move to the next area to test the sealing performance of the next area. If the marking pen 9 needs to be replaced, the controller 204 uses the clamping rod 908 to move the clamping head 905 along the clamping groove 904, thereby loosening the marking pen 9 for easy replacement.

[0024] This embodiment of a method for testing the sealing performance of a liquefied cold box, based on the liquefied cold box sealing performance testing device described above, includes the following steps: Step 1: When using this device, the staff places the test vehicle 2 on top of the liquefied cold box shell 1. At this time, the communication module of the controller 204 communicates with the external display terminal, and the movement can be observed through the mobile camera 201. Step 2: The controller 204 controls several negative pressure fans 305 to produce negative pressure, which allows the test vehicle 2 to move vertically. The adapter plate 203 can control the movement of the entire test vehicle 2 through the moving ball 306. The adapter rod 202 can drive the adapter plate 203 to move. At the same time, the angle adjustment motor 302 drives the connecting block 301 to rotate. Then, the extension and retraction of the ball lifting rod 3 can drive the moving ball 306 to move, thereby changing the angle of the ball lifting rod 3. This allows the test vehicle 2 to move along the curved surface, which facilitates the testing of the connecting pipe 101. Step 3: When the test vehicle 2 moves to the required test position, the controller 204 controls several sealing rods 402 to work together, thereby driving several sliding strips 405 to descend, so that several sealing plates 406 are in close contact with the outer shell 1 of the liquefied cold box. At this time, the pressure sensor 404 can determine the degree of contact. At this time, the sealing strips 410 can seal the seal between the sealing strips 410 and the outer shell 1 of the liquefied cold box. Step 4: The controller 204 further controls the vacuum pump 501 and vacuum valve 502 to work together to start the evacuation operation. At this time, the air inside the sealing strip 410 is extracted. The controller 204 can monitor the air pressure at the bottom of the sealing plate 5 through the pressure sensor 503. If this area is completely sealed, the value of the pressure sensor 503 will show that the bottom of the sealing plate 5 is vacuum. If there is a leak, the value of the pressure sensor 503 will change in real time, thus determining that this area is not sealed. At the same time, the nitrogen inside the liquefied cold box shell 1 will leak. Step 5: If not sealed, the controller 204 controls the adjustment motor 6 and the test motor 603 to work together, which can move the test plate 7 to any position at the bottom of the sealing plate 5. Furthermore, the controller 204 controls the high-precision infrared thermal imager 701 to collect the temperature field of the outer wall of the liquefied cold box shell 1 in real time. The controller 204 then generates a dynamic temperature cloud map through the data fusion terminal and automatically identifies "low-temperature abnormal spots" through the terminal algorithm. This abnormal spot area is then recorded as a suspected leak point. The controller 204 then controls the sealing plate moving rod 403, the adjustment motor 6, and the test motor 603 to work together to move the positioning tube 8 to this abnormal spot area. Step Six: At this time, the controller 204 moves to any position in this area via the thermal conductivity sensor 801, thereby determining the specific leak location based on the nitrogen concentration of the thermal conductivity sensor 801. Further, the controller 204 controls the proximity rod 906 to make the marking pen 9 stick tightly to the outer shell 1 of the liquefied cold box. At this time, the controller 204 controls the marking motor 809 to make the marking main gear 808 rotate around the marking secondary gear 807, thereby completing the marking work. At this time, the protective spring 910 can prevent the marking pen 9 from being damaged. Step 7: If the marker pen 9 needs to be replaced, the controller 204 can move the clamping head 905 via the clamping rod 908, thereby releasing the marker pen 9 and making it easy to replace; Step 8: If a "low-temperature abnormal spot" is found, but the test results show that the outer shell 1 of the liquefied cold box is well sealed, the entire device is judged to have a leak in the heat exchange tube 104. At this time, the staff opens the test connection tube 101 and places the test cart 2 inside the heat exchange tube 104. The above operation is repeated to test whether the inner wall of 104 is leaking, thereby ensuring the test effect and improving the test accuracy.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the sealing performance of a liquefied cold box, characterized in that: The test vehicle includes a liquefied gas cooling box shell (1), a test vehicle (2) on top of the liquefied gas cooling box shell (1), several ball lifting rods (3) on both the front and rear ends of the test vehicle (2), a moving ball (306) at the bottom of each ball lifting rod (3), a negative pressure plate (303) on the outside of each moving ball (306), several sliding grooves (407) fixed on the test vehicle (2), a sliding strip (405) slidably connected inside each sliding groove (407), a sealing strip (410) fixed inside each sliding strip (405), a sealing rod (402) on the top of each sliding strip (405), a sealing plate (5) inside several sealing strips (410), a vacuum pump (501) on the top of the sealing plate (5), an adjusting motor (6) fixed at the bottom of the sealing plate (5), and a moving groove (6) rotatably connected to the bottom of the adjusting motor (6). 01), the bottom of the moving slot (601) is provided with a test plate (7), the bottom of the test plate (7) is fixed with a high-precision infrared thermal imager (701), the rear end of the high-precision infrared thermal imager (701) is fixed with a positioning tube (8), the outside of the positioning tube (8) is fixed with a marking gear (807), the inside of the positioning tube (8) is fixed with a thermal conductivity sensor (801), the outside of the positioning tube (8) is provided with a proximity plate (907), the bottom of the proximity plate (907) is fixed with a proximity rod (906), the bottom of the proximity rod (906) is provided with a clamping plate (901), the bottom of the clamping plate (901) is fixed with a protective spring (910), the bottom of the protective spring (910) is fixed with a protective plate (911), the bottom of the clamping plate (901) is provided with several clamping rods (902), and the inside of several clamping rods (902) is provided with a marking pen (9).

2. The sealing performance testing device for a liquefied cold box according to claim 1, characterized in that: The liquefied cold box shell (1) has an insulation layer (102) fixed inside, a heat exchanger (103) fixed inside the insulation layer (102), a heat exchange tube (104) fixed inside the heat exchanger (103), and several connecting pipes (101) fixed outside the heat exchange tube (104). A mobile camera (201) is fixed at the left end of the test vehicle (2), a battery (205) is fixed at the bottom right end of the test vehicle (2), and a controller (204) is fixed at the rear end of the battery (205).

3. The liquefied gas cooling box sealing performance testing device according to claim 2, characterized in that: The test vehicle (2) has two sets of adapter rods (202) fixed on its top. Each set of adapter rods (202) has an adapter plate (203) fixed at its bottom outer end. Each adapter plate (203) has several hinge blocks (309) fixed at its bottom. Each hinge block (309) has a connecting block (301) hinged inside. Each connecting block (301) is fixedly connected to the ball lifting rod (3) at its bottom. Each hinge block (309) at its rightmost end has an angle adjustment motor (302) fixed outside. The angle adjustment motor (302) is rotatably connected to the connecting block (301) at one end of its shaft. The bottom of the ball lifting rod (3) is fixed with a movable ball positioning plate (307). Each movable ball positioning plate (307) is hinged to the movable ball (306) inside it. A movable motor (308) is fixed inside each movable ball positioning plate (307). Each movable motor (308) is rotatably connected to the movable ball (306) at one end. Each movable ball positioning plate (307) is fixedly connected to the negative pressure plate (303) outside it. A negative pressure motor (304) is fixed inside each negative pressure plate (303). A negative pressure fan (305) is rotatably connected to the bottom of each negative pressure motor (304).

4. The sealing performance testing device for a liquefied cold box according to claim 3, characterized in that: The test vehicle (2) has several support frames (4) fixed on its top. Each support frame (4) has a support plate (401) fixed on its top. The support plate (401) is fixedly connected to the sealing rod (402) at its bottom. Each sealing rod (402) has a pressure sensor (404) fixed at its bottom. Each pressure sensor (404) is fixedly connected to the slide bar (405) at its bottom. Each slide bar (405) has a sealing plate (406) fixed at its bottom.

5. The sealing performance testing device for a liquefied cold box according to claim 4, characterized in that: Each of the sealing strips (410) has a slider (408) at one end and a slide rail (409) fixed at the other end. Each slide rail (409) is in close contact with the slider (408) outside it. The bottom of the support plate (401) is also fixed with a sealing plate moving rod (403), and the bottom of the sealing plate moving rod (403) is fixedly connected to the sealing plate (5).

6. The sealing performance testing device for a liquefied cold box according to claim 5, characterized in that: A vacuum valve (502) is fixed on the top of the sealing disc (5). The vacuum valve (502) is fixedly connected to the vacuum pump (501) through a pipe. An air outlet (505) is provided on the sealing disc (5). A pressure sensor (503) is also fixed on the sealing disc (5). A sealing ring (504) is fixed on the outside of the sealing disc (5). The sealing ring (504) is tightly fitted with the sealing strip (410).

7. The sealing performance testing device for a liquefied cold box according to claim 6, characterized in that: The moving groove (601) is provided with a positioning groove (602). A test wheel (604) is slidably connected inside the moving groove (601). The rotating shaft of the test wheel (604) is slidably connected to the positioning groove (602). A test disk positioning strip (605) is hinged to the outer end of the rotating shaft of the test wheel (604). A test motor (603) is fixed to the right end of the test disk positioning strip (605). The test motor (603) is rotatably connected to the test wheel (604). The bottom of the test disk positioning strip (605) is fixedly connected to the test disk (7). An industrial camera (702) is also fixed to the bottom of the test disk (7). A lighting lamp (703) is fixed to the right end of the industrial camera (702).

8. The sealing performance testing device for a liquefied cold box according to claim 7, characterized in that: A marking motor (809) is also fixed to the bottom of the test disk (7). A marking main gear (808) is rotatably connected to the bottom of the marking motor (809). A bearing (810) is fixed to the bottom of the marking main gear (808). The outer ring of the bearing (810) is fixedly connected to the contact disk (907) at its bottom. A clamping block (909) is fixed to the bottom of the contact rod (906). The clamping block (909) is fixedly connected to the clamping disk (901) at its bottom. Several clamping blocks are fixed to the outside of the clamping block (909). Each clamping rod (908) has a clamping head (905) fixed to its exterior. Each clamping head (905) is fixedly connected to the clamping rod (902) at its bottom. Each clamping rod (902) has an anti-slip block (903) fixed inside. Each anti-slip block (903) is tightly fitted to the marking pen (9) inside. The clamping plate (901) is provided with a plurality of clamping grooves (904). Each clamping groove (904) is slidably connected to the clamping head (905) inside.

9. The sealing performance testing device for a liquefied cold box according to claim 8, characterized in that: The clamping disk (901) has a positioning ring (802) fixed at its rear end. The positioning ring (802) is slidably connected to the positioning tube (8). The positioning tube (8) has a lower end slide groove (803) fixed on its exterior. The lower end slide groove (803) has a lower end slide ring (804) slidably connected inside its interior. The lower end slide ring (804) is fixedly connected to the contact disk (907) at its front end. The marking main gear (808) meshes with the marking secondary gear (807). The marking secondary gear (807) has an upper end slide groove (805) at its top that is fixedly connected to the positioning tube (8). The upper end slide groove (805) has an upper end slide ring (806) slidably connected inside its interior. The upper end slide ring (806) is fixedly connected to the marking motor (809) at its front end.

10. A method for testing the sealing performance of a liquefied cold box, based on the sealing performance testing device for a liquefied cold box as described in claim 9, characterized in that: Includes the following steps: Step 1: When using this device, the staff places the test vehicle (2) on top of the liquefied cold box shell (1). At this time, the communication module of the controller (204) communicates with the external display terminal, and the movement can be observed through the mobile camera (201). Step 2: The controller (204) controls several negative pressure fans (305) to work and generate negative pressure, so that the test vehicle (2) can move in the vertical direction. The adapter plate (203) can control the movement of the entire test vehicle (2) through the moving ball (306). The adapter rod (202) can drive the adapter plate (203) to move. At the same time, the angle adjustment motor (302) drives the connecting block (301) to rotate. Then, the ball lifting rod (3) can be extended and retracted to drive the moving ball (306) to move, thereby changing the angle of the ball lifting rod (3), so that the test vehicle (2) can move along the curved surface, thus facilitating the testing of the connecting pipe (101). Step 3: When the test vehicle (2) moves to the required test position, the controller (204) controls several sealing rods (402) to work together, thereby driving several sliding strips (405) to descend, so that several sealing plates (406) are in close contact with the outer shell (1) of the liquefied cold box. At this time, the pressure sensor (404) can determine the degree of contact. At this time, due to the action of several sealing strips (410), the sealing strips (410) and the outer shell (1) of the liquefied cold box can be sealed. Step 4: The controller (204) further controls the vacuum pump (501) and vacuum valve (502) to work together to start the pumping operation. At this time, the air inside the sealing strip (410) is extracted. The controller (204) can monitor the air pressure at the bottom of the sealing plate (5) through the pressure sensor (503). If this area is completely sealed, the value of the pressure sensor (503) shows that the bottom of the sealing plate (5) is vacuum. If there is a leak, the value of the pressure sensor (503) will change in real time, thus determining that this area is not sealed. At the same time, the nitrogen inside the liquefied cold box shell (1) will leak. Step 5: If not sealed, the controller (204) controls the adjustment motor (6) and the test motor (603) to work together, so that the test plate (7) can be moved to any position at the bottom of the sealing plate (5). Furthermore, the controller (204) controls the high-precision infrared thermal imager (701) to collect the temperature field of the outer wall of the liquefied cold box shell (1) in real time. Furthermore, the dynamic temperature cloud map is generated through the data fusion terminal, and the "low temperature abnormal spot" is automatically identified through the terminal algorithm. Thus, this abnormal spot area is recorded as a suspected leak point. Furthermore, the controller (204) controls the sealing plate moving rod (403), the adjustment motor (6), and the test motor (603) to work together to move the positioning tube (8) to this abnormal spot area. Step 6: At this time, the controller (204) moves to any position in this area through the thermal conductivity sensor (801), so that the specific leak location can be determined according to the nitrogen concentration of the thermal conductivity sensor (801). Further, the controller (204) controls the proximity rod (906) to make the marking pen (9) stick to the outer shell (1) of the liquefied cold box. At this time, the controller (204) controls the marking motor (809) to make the marking main gear (808) rotate around the marking secondary gear (807) to complete the marking work. At this time, the marking pen (9) can be prevented from being damaged due to the action of the protective spring (910). Step 7: If the marker pen (9) needs to be replaced, the controller (204) can move the clamping head (905) through the clamping rod (908) to release the marker pen (9) and make it easy to replace; Step 8: If a "low temperature abnormal spot" is found, but the test results show that the outer shell (1) of the liquefied cold box is well sealed, the entire device is judged to have a leak in the heat exchange tube (104). At this time, the staff opens the test connection tube (101) and places the test cart (2) inside the heat exchange tube (104). The above operation is repeated to test whether the inner wall of (104) is leaking, thereby ensuring the test effect and improving the test accuracy.

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