A pressure vessel internal detection device

Abstract

This utility model belongs to the field of special equipment inspection technology, and in particular to a pressure vessel internal inspection device, including a connecting plate. The connecting plate is provided with a lifting structure, which includes a threaded rod. The threaded rod is located at the center of the connecting plate, and a first connecting hole is opened on the connecting plate near the threaded rod. By using the cooperation of the connecting ring and the threaded rod, when inspecting the inner wall of the pressure vessel, the inspection instrument is placed into the pressure vessel through the opening. Then, the first motor is started, causing the connecting ring to drive the threaded rod to rotate. Under the action of the threaded sleeve, the threaded rod drives the inspection instrument to move deeper into the pressure vessel, and the inspection instrument rotates at the same time, enabling the inspection instrument to perform a comprehensive inspection of the surrounding inner wall, reducing the labor intensity of the workers and ensuring the quality of pressure vessel inspection.

Description

Technical Field

[0001] This utility model belongs to the field of special equipment testing technology, specifically relating to a testing device for pressure vessels. Background Technology

[0002] Special equipment refers to equipment with strict requirements for use, operation, and maintenance, and that may pose significant dangers to personnel, the environment, and property. These typically include pressure vessels, boilers, elevators, lifting machinery, forklifts, gas cylinders, and amusement facilities. Pressure vessels, in particular, are closed systems that hold gases or liquids under pressure. Different regulations govern the design, manufacturing process, inspection items, contents, and methods for each category of pressure vessels. Pressure vessels have extremely wide applications, playing a vital role in many sectors of industry, civil use, military industry, and scientific research. In the chemical and petrochemical industries, pressure vessels are mainly used for heat transfer, mass transfer, and reaction processes, as well as for storing and transporting pressurized gases or liquefied gases. After long-term use, pressure vessels require inspection of their inner walls to prevent rupture and damage. Current ordinary inspection devices typically require workers to insert the instrument into the pressure vessel using a testing rod, and then rotate the rod to inspect the inner wall. This method is inconvenient and prone to missing certain areas of the inner wall.

[0003] To address the aforementioned problems, this application proposes a pressure vessel internal detection device. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a pressure vessel internal inspection device capable of comprehensively inspecting the inner wall of the pressure vessel.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure vessel internal detection device, including a connecting plate, wherein a lifting structure is provided on the connecting plate;

[0006] The lifting structure includes a threaded rod, which is located at the center of the connecting plate. A first connecting hole is provided on the connecting plate near the threaded rod, and the threaded rod is disposed in the first connecting hole. A connecting ring is rotatably connected to the top surface of the connecting plate near the threaded rod, and the threaded rod is disposed in the connecting ring and slidably connected to the connecting ring. An external gear ring is fixedly connected to the outer wall of the connecting ring. A threaded sleeve is fixedly connected to the bottom surface of the connecting plate near the threaded rod, and the threaded rod is disposed in the threaded sleeve and threadedly connected to the threaded sleeve. A detector is provided at the bottom end of the threaded rod.

[0007] As a preferred embodiment of the pressure vessel internal detection device of this utility model, a first gear is rotatably connected to the top surface of the connecting plate near the external gear ring, the first gear meshing with the external gear ring, and a first mounting bracket is fixedly connected to the top surface of the connecting plate near the first gear. A first motor is mounted on the first mounting bracket, and the output shaft of the first motor passes through the first mounting bracket and is fixedly connected to the first gear.

[0008] As a preferred embodiment of the pressure vessel internal detection device of this utility model, a baffle is fixedly connected to the top end of the threaded rod.

[0009] As a preferred embodiment of the pressure vessel internal detection device of this utility model, the threaded rod is provided with a plurality of positioning grooves arranged in a ring. A positioning block is fixedly connected to the inner wall of the connecting ring near each positioning groove. The positioning blocks are respectively arranged in the adjacent positioning grooves. The threaded rod is slidably connected to the connecting ring through the positioning grooves and the positioning blocks.

[0010] As a preferred embodiment of the pressure vessel internal detection device of this utility model, the bottom end of the threaded rod is provided with an adjustment structure;

[0011] The adjustment structure includes a rotating plate, which is fixedly connected to the bottom end of the threaded rod. The rotating plate has a first guide opening, and a first guide rod is disposed in the first guide opening. A first movable plate is fixedly connected to the top surface of the first guide rod. A mounting plate is fixedly connected to the side of the first movable plate away from the threaded rod. The detector is mounted on the side of the mounting plate away from the first movable plate. A rack is slidably connected to the bottom surface of the rotating plate near the first guide opening. The rack is fixedly connected to the first guide rod. A second gear is rotatably connected to the bottom surface of the rotating plate away from the threaded rod. The second gear meshes with the rack.

[0012] As a preferred embodiment of the pressure vessel internal detection device of this utility model, a second mounting bracket is fixedly connected to the bottom surface of the rotating plate near the second gear, a second motor is mounted on the second mounting bracket, and the output shaft of the second motor passes through the second mounting bracket and is fixedly connected to the second gear.

[0013] In a preferred embodiment of the pressure vessel internal detection device of this utility model, a groove is provided on the rotating plate near the rack, a slider is fixedly connected to the top surface of the rack, the slider is disposed in the groove, and the rack is slidably connected to the rotating plate through the slider and the groove.

[0014] As a preferred embodiment of the pressure vessel internal detection device of this utility model, the connecting plate is provided with an installation structure;

[0015] The installation structure includes symmetrically arranged second movable plates. Each connecting plate has a second guide opening near each of the second movable plates, and each second guide opening contains a second guide rod. The second guide rods are fixedly connected to the adjacent second movable plates. An arc-shaped clamping plate is fixedly connected to the bottom end of each second guide rod. The arc-shaped clamping plates on both sides are symmetrically arranged. Fixing plates are fixedly connected to both sides of the top surface of the connecting plate. Each fixing plate has a second connecting hole. Movable rods are fixedly connected to the opposite sides of the second movable plates, and these moving rods are respectively disposed within the adjacent second connecting holes. Springs are fixedly connected to the opposite sides of the second movable plates, and these springs are respectively disposed on the outer sides of the adjacent moving rods. The ends of the springs away from the second movable plates are fixedly connected to the adjacent fixing plates.

[0016] As a preferred embodiment of the pressure vessel internal detection device of this utility model, rubber pads are fixedly connected to the sides of the arc-shaped clamps that are close to each other.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: A lifting structure is added to this application, which utilizes the cooperation of a connecting ring and a threaded rod. When inspecting the inner wall of a pressure vessel, the detector is placed into the pressure vessel through the opening. Then, the first motor is started, causing the connecting ring to drive the threaded rod to rotate. Under the action of the threaded sleeve, the threaded rod moves the detector deeper into the pressure vessel, and the detector rotates simultaneously, allowing for a comprehensive inspection of the surrounding inner wall. This reduces the labor intensity of the workers and ensures the quality of the pressure vessel inspection. Simultaneously, an adjustment structure is added, allowing the position of the detector to be adjusted according to the position of the inner wall of the pressure vessel after it is placed inside. The second motor is then started to... The gear drives the rack to move, causing the mounting plate and the detector to move together. This adjusts the position of the detector, allowing it to be close to the inner wall of the pressure vessel, improving the quality of the inspection of the pressure vessel's inner wall. Simultaneously, an installation structure is incorporated. When the connecting plate is placed on the pressure vessel, the second moving plates on both sides are moved first, causing the springs to change from a relaxed state to a compressed state. This causes the second moving plates to move the arc-shaped clamping plates on both sides together. Then, the arc-shaped clamping plates are placed on both sides of the pressure vessel's connection port, and the second moving plates on both sides are released. Under the action of the springs, the second moving plates move the arc-shaped clamping plates on both sides closer together and clamp the connection port of the pressure vessel, thus completing the installation of the inspection device. This prevents the inspection device from moving arbitrarily during use and improves the stability of pressure vessel inspection. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a structural diagram showing the position of the external gear ring in this utility model;

[0021] Figure 3 This is a structural schematic diagram of the arc-shaped clamping plate in this utility model;

[0022] Figure 4 This is a structural schematic diagram of the threaded rod position in this utility model;

[0023] Figure 5 This is a structural schematic diagram of the mounting plate position in this utility model;

[0024] Figure 6 This is a structural diagram showing the position of the rack in this utility model;

[0025] Figure 7 This is a structural schematic diagram showing the position of the rotating plate in this utility model;

[0026] In the picture:

[0027] 1. Connecting plate;

[0028] 2. Lifting structure; 21. Threaded rod; 22. First connecting hole; 23. Connecting ring; 24. Positioning block; 25. Positioning groove; 26. External gear ring; 27. Threaded sleeve; 28. First gear; 29. ​​First mounting bracket; 210. First motor; 211. Baffle;

[0029] 3. Adjustment structure; 31. Rotating plate; 32. First guide port; 33. First guide rod; 34. First moving plate; 35. Mounting plate; 36. Rack; 37. Slider; 38. Slide groove; 39. Second gear; 310. Second mounting bracket; 311. Second motor;

[0030] 4. Detector;

[0031] 5. Installation structure; 51. Second movable plate; 52. Second guide port; 53. Second guide rod; 54. Arc-shaped clamp; 55. Rubber pad; 56. Fixing plate; 57. Second connecting hole; 58. Movable rod; 59. Spring. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1

[0034] like Figures 1 to 4 As shown;

[0035] In order to achieve comprehensive inspection of the inner wall of the pressure vessel, this pressure vessel internal inspection device includes a connecting plate 1, and a lifting structure 2 is provided on the connecting plate 1.

[0036] The lifting structure 2 includes a threaded rod 21, which is located at the center of the connecting plate 1. A first connecting hole 22 is provided on the connecting plate 1 near the threaded rod 21, and the threaded rod 21 is located inside the first connecting hole 22. A connecting ring 23 is rotatably connected to the top surface of the connecting plate 1 near the threaded rod 21, and the threaded rod 21 is located inside the connecting ring 23 and slidably connected to the connecting ring 23. An external gear ring 26 is fixedly connected to the outer wall of the connecting ring 23. A threaded sleeve 27 is fixedly connected to the bottom surface of the connecting plate 1 near the threaded rod 21, and the threaded rod 21 is located inside the threaded sleeve 27 and threadedly connected to the threaded sleeve 27. A detector 4 is provided at the bottom end of the threaded rod 21. A first gear 28 is rotatably connected to the top surface of the connecting plate 1 near the external gear ring 26, and the first gear 28 meshes with the external gear ring 26. A first mounting bracket 29 is fixedly connected to the top surface of the connecting plate 1 near the first gear 28, and a first motor 210 is mounted on the first mounting bracket 29. The output shaft of the first motor 210 passes through the first mounting bracket 29 and is fixedly connected to the first gear 28.

[0037] In this implementation plan: When inspecting the inner wall of a pressure vessel, the detector 4 is inserted into the pressure vessel through the opening, and the connecting plate 1 is placed on the pressure vessel. Then, the first motor 210 is started, causing the first gear 28 to rotate. The first gear 28 drives the outer gear ring 26 to rotate, which in turn drives the connecting ring 23 to rotate. This causes the connecting ring 23 to drive the threaded rod 21 to rotate. When the threaded rod 21 rotates, it moves the detector 4 deeper into the pressure vessel under the action of the threaded sleeve 27, and rotates along with it. This allows the detector 4 to perform a comprehensive inspection of the surrounding inner wall. Furthermore, the narrow pitch of the threaded rod 21 ensures that the detector 4 does not reach the deepest part too quickly, ensuring that the detector 4 can fully inspect the inner wall of the pressure vessel. This reduces the labor intensity of the workers and ensures the quality of the pressure vessel inspection.

[0038] Furthermore:

[0039] like Figure 4 As shown;

[0040] Based on the above:

[0041] To prevent the threaded rod 21 from falling off, in an optional embodiment, a baffle 211 is fixedly connected to the top end of the threaded rod 21.

[0042] In this embodiment, the baffle 211 can limit the threaded rod 21 to prevent it from falling off.

[0043] Furthermore:

[0044] like Figures 2 to 4 As shown;

[0045] Based on the above:

[0046] In order to achieve a sliding connection between the threaded rod 21 and the connecting ring 23, in an optional embodiment, the threaded rod 21 is provided with a plurality of positioning grooves 25 arranged in a ring. A positioning block 24 is fixedly connected to the inner wall of the connecting ring 23 near each positioning groove 25. The positioning blocks 24 are respectively disposed in the adjacent positioning grooves 25. The threaded rod 21 is slidably connected to the connecting ring 23 through the positioning grooves 25 and the positioning blocks 24.

[0047] In this embodiment, by setting the positioning groove 25 and the positioning block 24, the connecting ring 23 can drive the threaded rod 21 to rotate without affecting the lifting and lowering movement of the threaded rod 21.

[0048] Furthermore:

[0049] like Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown;

[0050] Based on the above:

[0051] In order to enable the detector 4 to get close to the inner wall of the pressure vessel, in an optional embodiment, the bottom end of the threaded rod 21 is provided with an adjustment structure 3;

[0052] The adjustment structure 3 includes a rotating plate 31, which is fixedly connected to the bottom end of the threaded rod 21. A first guide opening 32 is provided on the rotating plate 31, and a first guide rod 33 is provided inside the first guide opening 32. A first moving plate 34 is fixedly connected to the top surface of the first guide rod 33. A mounting plate 35 is fixedly connected to the side of the first moving plate 34 away from the threaded rod 21. The detector 4 is installed on the side of the mounting plate 35 away from the first moving plate 34. A rack 36 is slidably connected to the bottom surface of the rotating plate 31 near the first guide opening 32. The rack 36 is fixedly connected to the first guide rod 33. A second gear 39 is rotatably connected to the bottom surface of the rotating plate 31 away from the threaded rod 21. The second gear 39 meshes with the rack 36. A second mounting bracket 310 is fixedly connected to the bottom surface of the rotating plate 31 near the second gear 39. A second motor 311 is mounted on the second mounting bracket 310. The output shaft of the second motor 311 passes through the second mounting bracket 310 and is fixedly connected to the second gear 39.

[0053] In this embodiment: after the detector 4 is placed inside the pressure vessel, its position can be adjusted according to the position of the inner wall of the pressure vessel. Starting the second motor 311 can drive the second gear 39 to rotate. When the second gear 39 rotates, it will drive the rack 36 to move, causing the rack 36 to drive the first guide rod 33 to move within the first guide opening 32. The first guide rod 33 will drive the first moving plate 34 to move together, causing the first moving plate 34 to drive the mounting plate 35 to move together, thereby causing the mounting plate 35 to drive the detector 4 to move together, adjusting the position of the detector 4 so that the detector 4 can be close to the inner wall of the pressure vessel, improving the detection quality of the inner wall of the pressure vessel.

[0054] Furthermore:

[0055] like Figure 6 and Figure 7 As shown;

[0056] Based on the above:

[0057] In order to guide the movement of the rack 36, in an optional embodiment, the rotating plate 31 is provided with a groove 38 near the rack 36, and a slider 37 is fixedly connected to the top surface of the rack 36. The slider 37 is disposed in the groove 38, and the rack 36 is slidably connected to the rotating plate 31 through the slider 37 and the groove 38.

[0058] In this embodiment, the movement direction of the rack 36 can be guided by the sliding groove 38 and the slider 37 to prevent the rack 36 from deviating, and at the same time, the rack 36 can maintain meshing with the second gear 39.

[0059] Furthermore:

[0060] like Figures 1 to 3 As shown;

[0061] Based on the above:

[0062] To facilitate the installation of the detection device, in an optional embodiment, the connecting plate 1 is provided with a mounting structure 5;

[0063] The mounting structure 5 includes symmetrically arranged second movable plates 51. Each connecting plate 1 has a second guide opening 52 near each second movable plate 51. Each second guide opening 52 contains a second guide rod 53, which is fixedly connected to the adjacent second movable plate 51. Each second guide rod 53 has an arc-shaped clamping plate 54 fixedly connected to its bottom end. The arc-shaped clamping plates 54 on both sides are symmetrically arranged. Both sides of the top surface of the connecting plate 1 are fixedly connected to fixing plates 56. Each fixing plate 56 has a second connecting hole 57. Each side of the second movable plates 51 that is far apart from each other is fixedly connected to a movable rod 58, which is respectively located in the adjacent second connecting hole 57. Each side of the second movable plates 51 that is far apart from each other is fixedly connected to a spring 59, which is located on the outside of the adjacent movable rod 58. The end of the spring 59 that is far away from the second movable plate 51 is fixedly connected to the adjacent fixing plate 56.

[0064] In this embodiment: when the connecting plate 1 is placed on the pressure vessel, the second moving plates 51 on both sides are moved away from each other, causing the second moving plates 51 to drive the moving rod 58 to move, causing the spring 59 to change from a relaxed state to a compressed state, causing the second moving plates 51 to drive the arc-shaped clamping plates 54 on both sides to move together, and then the arc-shaped clamping plates 54 are placed on both sides of the pressure vessel connection port. Then the second moving plates 51 on both sides are released, causing the second moving plates 51 to move closer to each other under the action of the spring 59, causing the second moving plates 51 to drive the arc-shaped clamping plates 54 on both sides to move closer to each other and clamp the connection port of the pressure vessel, thereby completing the installation of the detection device, preventing the detection device from moving randomly during use, and improving the stability of the pressure vessel detection.

[0065] Furthermore:

[0066] like Figure 2 As shown;

[0067] Based on the above:

[0068] To improve the stability of the device installation, in an optional embodiment, rubber pads 55 are fixedly connected to the sides of the arc-shaped clamps 54 that are close to each other.

[0069] In this embodiment, the rubber pad 55 can increase the friction with the pressure vessel connection port, thereby improving the clamping effect of the arc-shaped clamp 54 and improving the stability of the device installation.

[0070] The working principle and usage process of this utility model are as follows: When inspecting the inner wall of a pressure vessel, the detector 4 is inserted into the pressure vessel through the opening, and the connecting plate 1 is placed on the pressure vessel. Then, the second moving plates 51 on both sides are moved away from each other, causing the second moving plates 51 to drive the moving rod 58 to move, causing the spring 59 to change from a relaxed state to a compressed state. This causes the second moving plates 51 to drive the arc-shaped clamps 54 on both sides to move together. Then, the arc-shaped clamps 54 are placed on both sides of the pressure vessel connection port, and then released. The second movable plates 51 on both sides are brought closer together under the action of the spring 59. This causes the second movable plates 51 to drive the arc-shaped clamping plates 54 on both sides to move closer together and clamp the connection port of the pressure vessel, thereby completing the installation of the detection device and preventing it from moving arbitrarily during use. This improves the stability of the pressure vessel detection. The position of the detector 4 can be adjusted according to the position of the inner wall of the pressure vessel. Starting the second motor 311 can drive the second gear 39 to rotate. When the second gear 39 rotates, it will drive the rack 36 to move, causing the rack 36 to move. 6. The first guide rod 33 moves within the first guide opening 32, causing the first guide rod 33 to move together with the first moving plate 34, which in turn moves together with the mounting plate 35. This, in turn, causes the mounting plate 35 to move together with the detector 4, adjusting the position of the detector 4 so that it can be close to the inner wall of the pressure vessel, improving the detection quality of the inner wall of the pressure vessel. Finally, the first motor 210 is started, causing the first motor 210 to drive the first gear 28 to rotate, which in turn drives the external gear ring 26 to rotate, causing the external gear ring 26 to drive... The connecting ring 23 rotates, causing the threaded rod 21 to rotate. When the threaded rod 21 rotates, it will move the detector 4 deeper into the pressure vessel under the action of the threaded sleeve 27, and the detector 4 will rotate at the same time, so that the detector 4 can perform a comprehensive inspection of the surrounding inner wall. In addition, the thread pitch of the threaded rod 21 is relatively narrow, which can ensure that the detector 4 does not reach the depth too quickly, ensuring that the detector 4 can fully inspect the inner wall of the pressure vessel, reducing the labor intensity of the workers and ensuring the quality of the pressure vessel inspection.

[0071] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An in-service inspection device for a pressure vessel comprising a connecting plate (1), characterized in that: The connecting plate (1) is provided with a lifting structure (2); The lifting structure (2) includes a threaded rod (21), which is located at the center of the connecting plate (1). The connecting plate (1) has a first connecting hole (22) near the threaded rod (21), and the threaded rod (21) is located in the first connecting hole (22). A connecting ring (23) is rotatably connected to the top surface of the connecting plate (1) near the threaded rod (21). The threaded rod (21) is located in the connecting ring (23) and is slidably connected to the connecting ring (23). An external gear ring (26) is fixedly connected to the outer wall of the connecting ring (23). A threaded sleeve (27) is fixedly connected to the bottom surface of the connecting plate (1) near the threaded rod (21). The threaded rod (21) is located in the threaded sleeve (27) and is threadedly connected to the threaded sleeve (27). A detector (4) is provided at the bottom end of the threaded rod (21).

2. The pressure vessel internal detection device according to claim 1, characterized in that: The top surface of the connecting plate (1) is rotatably connected to a first gear (28) near the external gear ring (26). The first gear (28) meshes with the external gear ring (26). The top surface of the connecting plate (1) is fixedly connected to a first mounting bracket (29) near the first gear (28). A first motor (210) is mounted on the first mounting bracket (29). The output shaft of the first motor (210) passes through the first mounting bracket (29) and is fixedly connected to the first gear (28).

3. The pressure vessel internal detection device according to claim 1, characterized in that: A baffle (211) is fixedly connected to the top end of the threaded rod (21).

4. The pressure vessel internal detection device according to claim 1, characterized in that: The threaded rod (21) has a plurality of positioning grooves (25) arranged in a ring. The inner wall of the connecting ring (23) is fixedly connected to each positioning groove (25) with a positioning block (24) at a position close to each positioning groove (25). The positioning blocks (24) are respectively set in the adjacent positioning grooves (25). The threaded rod (21) is slidably connected to the connecting ring (23) through the positioning grooves (25) and the positioning blocks (24).

5. The pressure vessel internal detection device according to claim 1, characterized in that: The bottom end of the threaded rod (21) is provided with an adjustment structure (3); The adjustment structure (3) includes a rotating plate (31), which is fixedly connected to the bottom end of the threaded rod (21). A first guide opening (32) is provided on the rotating plate (31), and a first guide rod (33) is provided in the first guide opening (32). A first moving plate (34) is fixedly connected to the top surface of the first guide rod (33). An installation plate (35) is fixedly connected to the side of the first moving plate (34) away from the threaded rod (21). The detector (4) is installed on the side of the installation plate (35) away from the first moving plate (34). A rack (36) is slidably connected to the bottom surface of the rotating plate (31) near the first guide opening (32). The rack (36) is fixedly connected to the first guide rod (33). A second gear (39) is rotatably connected to the bottom surface of the rotating plate (31) away from the threaded rod (21). The second gear (39) meshes with the rack (36).

6. The pressure vessel internal detection device according to claim 5, characterized in that: A second mounting bracket (310) is fixedly connected to the bottom surface of the rotating plate (31) near the second gear (39). A second motor (311) is mounted on the second mounting bracket (310). The output shaft of the second motor (311) passes through the second mounting bracket (310) and is fixedly connected to the second gear (39).

7. The pressure vessel internal detection device according to claim 5, characterized in that: The rotating plate (31) has a groove (38) near the rack (36). A slider (37) is fixedly connected to the top surface of the rack (36). The slider (37) is located in the groove (38). The rack (36) is slidably connected to the rotating plate (31) through the slider (37) and the groove (38).

8. The pressure vessel internal detection device according to claim 1, characterized in that: The connecting plate (1) is provided with an installation structure (5); The installation structure (5) includes symmetrically arranged second movable plates (51). The connecting plate (1) has a second guide opening (52) near each of the second movable plates (51). A second guide rod (53) is provided in each of the second guide openings (52). The second guide rods (53) are fixedly connected to the adjacent second movable plates (51). An arc-shaped clamp (54) is fixedly connected to the bottom end of each second guide rod (53). The arc-shaped clamps (54) on both sides are symmetrically arranged. Fixed clamps are fixedly connected to both sides of the top surface of the connecting plate (1). Each of the fixed plates (56) has a second connecting hole (57). Each of the two moving plates (51) is fixedly connected to a moving rod (58) on the side away from each other. The moving rods (58) are respectively arranged in the second connecting hole (57) that are close to each other. Each of the two moving plates (51) is fixedly connected to a spring (59) on the side away from each other. The springs (59) are respectively arranged on the outside of the moving rods (58) that are close to each other. The end of the spring (59) away from the second moving plate (51) is fixedly connected to the fixed plate (56) that is close to each other.

9. The pressure vessel internal detection device according to claim 8, characterized in that: Rubber pads (55) are fixedly connected to the sides of the arc-shaped clamps (54) that are close to each other.

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