A straight tube camera

Abstract

The application relates to the technical field of straight tube cameras, and discloses a straight tube camera which comprises a back cover, the surface of the back cover is threadedly connected with a tube body, the end, away from the back cover, of the tube body is threadedly connected with a front cover, the inside of the front cover is provided with lens one and lens two, the inside of the back cover is provided with a camera main body, the inside of the front cover is provided with a lens mounting component, and the back cover, the tube body and the front cover are all made of radiation-resistant materials; the lens mounting component comprises a retainer, the end of the retainer is in contact with the end of the back cover, and the end of the retainer and the end of the back cover are threadedly connected through a screw rod one. When the triangular block moves, the inclined surface pushes the inclined surface extrusion ring to move, the inclined surface extrusion ring pushes the rubber ring to extrude the inner wall of the sealing groove when moving, so that the sealing effect of the tube body and the front cover is improved, the inclined surface extrusion ring extrudes the rubber ring to expand when moving, the rubber ring extrudes the inner wall of the front cover and the tube body when expanding, so that the sealing performance after the tube body and the front cover are installed is improved, and the sealing effect after the camera is installed is improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear industry monitoring technology, specifically a cylindrical camera for use in nuclear power plants. Background Technology

[0002] The cylindrical camera used for monitoring nuclear power plants is a radiation-resistant camera designed for high-radiation environments. It can work stably under the strong radiation conditions of nuclear power plants and monitor the safety status of key equipment or areas in real time. The camera usually adopts a cylindrical design with a compact structure, which makes it easy to install and operate flexibly in narrow spaces. They use radiation-resistant materials, such as stainless steel or special alloys, to resist radiation damage. At the same time, the sensors and circuits are also reinforced to ensure long-term reliable operation in radiation environments.

[0003] Rectangular cameras are typically assembled using threaded connections. The seal between the body and the front and rear covers is usually achieved by using sealing rings and threaded contact to seal the joints. Over time, the threads between the body and the front and rear covers will wear down. Once this wear occurs, moisture can easily enter the camera body, thus affecting the stability of the internal components. Summary of the Invention

[0004] The purpose of this invention is to provide a straight-tube camera to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a cylindrical camera, comprising a rear cover, a cylindrical body threadedly connected to the surface of the rear cover, a front cover threadedly connected to the end of the cylindrical body away from the rear cover, a first lens and a second lens disposed inside the front cover, a camera body disposed inside the rear cover, and a lens mounting component disposed inside the front cover. The rear cover, the cylindrical body, and the front cover are all made of radiation-resistant material.

[0007] The lens mounting component includes a retainer, the end of which contacts the end of the rear cover. The retainer and the end of the rear cover are threaded together by a screw. A mounting plate is fixedly connected to the end of the retainer away from the rear cover. A screw is threadedly connected to the inner wall of the mounting plate. A screw hole bracket is provided at the end of the mounting plate away from the retainer. The lens is threadedly connected to the inner wall of the screw hole bracket. A threaded bracket is threadedly connected to the inner wall of the front cover. A screw is threadedly connected to the inner wall of the threaded bracket. A lamp ring is provided on the surface of the threaded bracket. Sealing grooves are provided on the surface of the rear cover and the surface of the cylinder. A protective bracket is fixedly connected to the inner wall of the threaded bracket. A sealing component is provided inside the sealing groove. A protective component is provided inside the threaded bracket.

[0008] Furthermore, the retainer is symmetrically arranged around the camera body, with one end of the retainer away from the rear cover extending into the interior of the front cover. The mounting plate and the screw hole bracket are connected by two screw threads. The screw hole bracket is located inside the front cover. The surface of the first lens is fixedly connected to the inner wall of the front cover, and the inner ring wall of the first lens is fixedly connected to the surface of the protective frame.

[0009] Furthermore, the surface of the second lens is fixedly connected to the inner wall of the protective frame, the lamp ring is connected to the threaded frame by a screw thread, the end of the lens away from the screw hole frame is in contact with the inner wall of the protective frame, the lamp ring is located at the end of the threaded frame and the first lens that are close to each other, the sealing groove on the surface of the rear cover is located inside the barrel, and the sealing groove on the surface of the barrel is located inside the front cover.

[0010] Furthermore, the sealing component includes a rubber ring, the inner wall of which contacts the inner wall of the sealing groove, a grooved ring is fixedly connected to the inner wall of the sealing groove, a triangular block is slidably connected to the inner wall of the grooved ring, a beveled extrusion ring is provided at one end of the grooved ring and the rubber ring that are close to each other, and a sealing gasket is fixedly connected to the other end of the beveled extrusion ring that is away from the rubber ring.

[0011] Furthermore, there are two grooved rings, each located inside a sealing groove, and the grooved ring contains multiple triangular blocks.

[0012] Furthermore, the end of the triangular block away from the groove ring contacts the surface of the inclined extrusion ring, the inner wall of the sealing gasket contacts the inner wall of the sealing groove, and the inclined surface of the inclined extrusion ring contacts the inner wall of the rubber ring.

[0013] Furthermore, the protective component includes a limiting ring, the surface of which is fixedly connected to the inner wall of the threaded frame. A telescopic plate is fixedly connected to the inner wall of the limiting ring. A pressing plate is fixedly connected to the end of the telescopic plate away from the limiting ring. A contact pad is fixedly connected to the end of the pressing plate away from the telescopic plate. A spring sheet is fixedly connected to the surface of the telescopic plate. The end of the spring sheet away from the telescopic plate is fixedly connected to the surface of the pressing plate. An inclined plate is fixedly connected to the end of the pressing plate away from the contact pad. A circular hole is opened in the inner wall of the threaded frame. A spring rod is fixedly connected to the inner wall of the circular hole. A bent plate is fixedly connected to the telescopic end of the spring rod. A pressing ring is fixedly connected to the end of the bent plate away from the spring rod. A top rod is fixedly connected to the surface of the bent plate.

[0014] Furthermore, the number of telescopic plates is set to multiple, and the multiple telescopic plates are arranged circumferentially around the limiting ring. The number of elastic rods is set to two, and the two elastic rods are symmetrically arranged around the threaded frame.

[0015] Furthermore, the end of the push rod away from the bending plate contacts the surface of the screw hole bracket, the inner wall of the extrusion ring contacts the inclined surface of the inclined plate, and the end of the contact pad away from the extrusion plate contacts the surface of the lens.

[0016] The present invention has the following beneficial effects:

[0017] This invention involves installing the rear cover at the camera position in a nuclear power plant, then fixing a retainer to the end of the rear cover using a screw. The retainer is used to install and fix components such as circuit boards. A screw rod is used to fix a screw hole bracket to the surface of the mounting plate. After the screw hole bracket is installed, the lens can be fixed by a threaded connection. The lens and screw hole bracket are connected by a thread to allow for adjustment of the lens position. After the lens is fixed, the operator can place the camera body onto the surface of the retainer. The camera body is then fixed to the surface of the rear cover by a thread. After the camera body is installed, the front cover is then installed to the surface of the camera body by a thread, improving the convenience of camera installation.

[0018] When the triangular block of this invention moves, it uses the inclined surface to push the inclined extrusion ring to move. When the inclined extrusion ring moves, it pushes the rubber ring to squeeze the inner wall of the sealing groove, thereby improving the sealing effect of the cylinder and the front cover. When the inclined extrusion ring moves, it squeezes the rubber ring to expand. When the rubber ring expands, it squeezes the inner wall of the front cover and the cylinder, thereby improving the sealing performance of the cylinder and the front cover after installation, and improving the sealing effect after the camera is installed.

[0019] In this invention, when the bending plate moves, it pushes the extrusion ring to extrude the inclined plate. After the inclined plate is under pressure, it pushes the telescopic plate to extend through the extrusion plate. The telescopic plate limits the extrusion plate, thereby improving the stability of the extrusion plate when it moves. When the extrusion plate moves, it pushes the contact pad to gradually contact the lens. The contact pad is used to extrude and limit the lens, thereby improving the stability of the lens during shooting and video recording operations and avoiding instability after the lens extends too long.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2This is a schematic cross-sectional view of the cylinder structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall structure of the lens mounting component of the present invention;

[0025] Figure 4 This is another structural schematic diagram of the lens mounting component of the present invention;

[0026] Figure 5 This is a schematic diagram of the overall structure of the sealing component of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged diagram of part A in the diagram;

[0028] Figure 7 This is a schematic diagram of the overall structure of the protective component of the present invention;

[0029] Figure 8 This is another structural schematic diagram of the protective component of the present invention.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] In the diagram: 1. Rear cover; 2. Body; 3. Front cover; 4. Lens 2; 5. Lens 1; 6. Camera body; 7. Lens mounting components; 8. Sealing components; 9. Protective components; 20. Retainer; 21. Mounting plate; 22. Threaded bracket; 23. Screw 2; 24. Sealing groove; 25. Screw 1; 26. Screw hole bracket; 27. Lamp ring; 28. Lens; 29. ​​Protective bracket; 30. Screw 3; 41. Rubber ring; 42. Sealing gasket; 43. Beveled extrusion ring; 44. Triangular block; 45. Groove ring; 50. Limiting ring; 51. Elastic rod; 52. Telescopic plate; 53. Round hole; 54. Extrusion ring; 55. Extrusion plate; 56. Beveled plate; 57. Contact pad; 58. Top rod; 59. Spring piece; 60. Bend plate. Detailed Implementation

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

[0033] Please see Figures 1-8 As shown, the present invention is a cylindrical camera, including a rear cover 1, a cylindrical body 2 is threadedly connected to the surface of the rear cover 1, a front cover 3 is threadedly connected to the end of the cylindrical body 2 away from the rear cover 1, a lens 5 and a lens 4 are disposed inside the front cover 3, a camera body 6 is disposed inside the rear cover 1, and a lens mounting component 7 is disposed inside the front cover 3.

[0034] The lens mounting component 7 includes a retainer 20, the end of which contacts the end of the rear cover 1. The retainer 20 and the end of the rear cover 1 are threaded together by a screw 25. A mounting plate 21 is fixedly connected to the end of the retainer 20 away from the rear cover 1. A screw 23 is threaded onto the inner wall of the mounting plate 21. A screw hole bracket 26 is provided at the end of the mounting plate 21 away from the retainer 20. A lens 28 is threaded onto the inner wall of the screw hole bracket 26. A threaded bracket 22 is threaded onto the inner wall of the front cover 3. A screw 30 is threaded onto the inner wall of the threaded bracket 22. A lamp ring 27 is provided on the surface of the threaded bracket 22. Sealing grooves 24 are provided on the surface of the rear cover 1 and the surface of the cylinder 2. A protective bracket 29 is fixedly connected to the inner wall of the threaded bracket 22. After the rear cover 1 is installed at the shooting and recording position of the nuclear power plant, the lens is fixedly connected to the screw 25. The retainer 20 is fixed to the end of the rear cover 1. The retainer 20 is used to install and fix components such as circuits and circuit boards. The screw hole bracket 26 is fixed to the surface of the mounting plate 21 by the screw 23. After the screw hole bracket 26 is installed, the lens 28 can be fixed by the threaded connection. The lens 28 and the screw hole bracket 26 are threaded to adjust the position of the lens 28. After the lens 28 is fixed, the operator can put the barrel 2 on the surface of the retainer 20. The barrel 2 is fixed by the thread on the surface of the rear cover 1. After the barrel 2 is installed, the front cover 3 is installed on the surface of the barrel 2 by the thread, which improves the convenience of camera installation. The sealing groove 24 is provided with a sealing component 8, and the threaded bracket 22 is provided with a protective component 9.

[0035] The retainer 20 is symmetrically arranged around the camera body 6. The end of the retainer 20 away from the rear cover 1 extends into the interior of the front cover 3. The mounting plate 21 and the screw hole bracket 26 are threadedly connected by the screw 23. The screw hole bracket 26 is located inside the front cover 3. The surface of the lens 5 is fixedly connected to the inner wall of the front cover 3. The inner ring wall of the lens 5 is fixedly connected to the surface of the protective frame 29.

[0036] The surface of lens 24 is fixedly connected to the inner wall of the protective frame 29. The lamp ring 27 is threadedly connected to the threaded frame 22 by the screw 30. The end of lens 28 away from the screw hole frame 26 is in contact with the inner wall of the protective frame 29. The lamp ring 27 is located at the end of the threaded frame 22 and lens 1 5 that are close to each other. The sealing groove 24 on the surface of the rear cover 1 is located inside the barrel 2. The sealing groove 24 on the surface of the barrel 2 is located inside the front cover 3.

[0037] The sealing component 8 includes a rubber ring 41. The inner wall of the rubber ring 41 contacts the inner wall of the sealing groove 24. A grooved ring 45 is fixedly connected to the inner wall of the sealing groove 24. A triangular block 44 is slidably connected to the inner wall of the grooved ring 45. A beveled extrusion ring 43 is provided at one end of the grooved ring 45 and the rubber ring 41 that are close to each other. A sealing gasket 42 is fixedly connected to the other end of the beveled extrusion ring 43 that is away from the rubber ring 41. When the triangular block 44 moves, it uses the beveled surface to push the beveled extrusion ring 43 to move. When the beveled extrusion ring 43 moves, it pushes the rubber ring 41 to squeeze the inner wall of the sealing groove 24, thereby improving the sealing effect of the barrel 2 and the front cover 3. When the beveled extrusion ring 43 moves, it squeezes the rubber ring 41 to expand. When the rubber ring 41 expands, it squeezes the inner wall of the front cover 3 and the barrel 2, thereby improving the sealing performance of the barrel 2 and the front cover 3 after installation, and improving the sealing effect after the camera is installed.

[0038] There are two groove rings 45, which are located inside the two sealing grooves 24 respectively. Multiple triangular blocks 44 are provided inside the groove rings 45.

[0039] The end of the triangular block 44 away from the groove ring 45 is in contact with the surface of the inclined extrusion ring 43, the inner wall of the sealing gasket 42 is in contact with the inner wall of the sealing groove 24, and the inclined surface of the inclined extrusion ring 43 is in contact with the inner wall of the rubber ring 41.

[0040] The protective component 9 includes a limiting ring 50, the surface of which is fixedly connected to the inner wall of the threaded bracket 22. A telescopic plate 52 is fixedly connected to the inner wall of the limiting ring 50. A pressing plate 55 is fixedly connected to the end of the telescopic plate 52 away from the limiting ring 50. A contact pad 57 is fixedly connected to the end of the pressing plate 55 away from the telescopic plate 52. A spring piece 59 is fixedly connected to the surface of the telescopic plate 52. The end of the spring piece 59 away from the telescopic plate 52 is fixedly connected to the surface of the pressing plate 55. A slant plate 56 is fixedly connected to the end of the pressing plate 55 away from the contact pad 57. A circular hole 53 is opened in the inner wall of the threaded bracket 22. A spring rod 51 is fixedly connected to the inner wall of the circular hole 53. The telescopic end of the spring rod 51... A bent plate 60 is fixedly connected, and a compression ring 54 is fixedly connected to the end of the bent plate 60 away from the elastic rod 51. A top rod 58 is fixedly connected to the surface of the bent plate 60. When the bent plate 60 moves, it pushes the compression ring 54 to compress the inclined plate 56. After the inclined plate 56 is under pressure, it pushes the telescopic plate 52 to extend through the compression plate 55. The telescopic plate 52 limits the compression plate 55, improving the stability of the compression plate 55 when it moves. When the compression plate 55 moves, it pushes the contact pad 57 to gradually contact the lens 28. The contact pad 57 is used to compress and limit the lens 28, improving the stability of the lens 28 when shooting and recording, and avoiding instability after the lens 28 extends too long.

[0041] There are multiple telescopic plates 52, which are arranged circumferentially around the limiting ring 50. There are two elastic rods 51, which are arranged symmetrically around the threaded frame 22.

[0042] The end of the push rod 58 away from the bending plate 60 contacts the surface of the screw hole bracket 26, the inner wall of the extrusion ring 54 contacts the inclined surface of the inclined plate 56, and the end of the contact pad 57 away from the extrusion plate 55 contacts the surface of the lens 28.

[0043] In use, after installing the back cover 1 at the camera position in the nuclear power plant, the retainer 20 is fixed to the end of the back cover 1 using screw 25. The retainer 20 is used to install and fix components such as wiring and circuit boards. Screw 23 is used to fix the screw hole bracket 26 to the surface of the mounting plate 21. After the screw hole bracket 26 is installed, the lens 28 can be fixed using a threaded connection. The lens 28 and the screw hole bracket 26 are threaded together to allow for adjustment of the lens 28's position. After the lens 28 is fixed, the operator can then fit the cylinder 2 onto the surface of the retainer 20. The cylinder 2 is threaded onto the surface of the back cover 1. After the front cover 3 is fixed and the body 2 is installed, the front cover 3 is installed on the surface of the body 2 by means of threads. Inside the body 2, a threaded bracket 22 is threadedly connected. The surface of the threaded bracket 22 is fixed with a lamp ring 27 by a screw 30. The lamp ring 27 is used to supplement the lighting for the lens 28 to shoot and record, so as to avoid poor shooting and recording effects due to insufficient brightness. The threaded bracket 22 is threadedly connected to the inner wall of the front cover 3, so that the lamp ring 27 can be replaced or repaired after the threaded bracket 22 is removed. The front cover 3 and the body 2 can be disassembled one by one, which is convenient for separate disassembly and installation, improving the convenience of the camera when shooting and recording.

[0044] When the front cover 3 is installed on the surface of the barrel 2 and the barrel 2 is installed on the surface of the rear cover 1, both the barrel 2 and the front cover 3 will contact the inclined surface of the triangular block 44. At this time, the barrel 2 and the front cover 3 will push the triangular block 44 to move into the groove ring 45. When the triangular block 44 moves, it will push the inclined surface extrusion ring 43 to move using the inclined surface. When the inclined surface extrusion ring 43 moves, it will push the rubber ring 41 to extrude the inner wall of the sealing groove 24, thereby improving the sealing effect of the barrel 2 and the front cover 3. When the inclined surface extrusion ring 43 moves, it will extrude the rubber ring 41 to expand. When the rubber ring 41 expands, it will extrude the inner wall of the front cover 3 and the barrel 2, thereby improving the sealing performance of the barrel 2 and the front cover 3 after installation and improving the sealing effect after the camera is installed.

[0045] When the front cover 3 is installed on the surface of the cylinder body 2, the front cover 3 will push the bent plate 60 to move through the connection between the threaded bracket 22 and the elastic rod 51. When the bent plate 60 moves, it will push the top rod 58 to squeeze the threaded hole bracket 26, thereby causing the elastic rod 51 to move into the round hole 53. When the bent plate 60 moves, it will push the compression ring 54 to squeeze the inclined plate 56. After the inclined plate 56 is under pressure, it will push the telescopic plate 52 to extend through the compression plate 55. The telescopic plate 52 will limit the compression plate 55 and improve the stability of the compression plate 55 when it moves. When the compression plate 55 moves, it will push the contact pad 57 to gradually contact the lens 28. The contact pad 57 will squeeze and limit the lens 28, improving the stability of the lens 28 when shooting and recording, and avoiding instability after the lens 28 extends too long.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cylindrical camera, comprising a rear cover (1), a cylindrical body (2) threadedly connected to the surface of the rear cover (1), a front cover (3) threadedly connected to one end of the cylindrical body (2) away from the rear cover (1), a first lens (5) and a second lens (4) disposed inside the front cover (3), and a camera body (6) disposed inside the rear cover (1), characterized in that, The front cover (3) is provided with a lens mounting component (7). The lens mounting component (7) includes a retainer (20), the end of which contacts the end of the rear cover (1). The retainer (20) and the end of the rear cover (1) are threaded together by a screw (25). A mounting plate (21) is fixedly connected to the end of the retainer (20) away from the rear cover (1). A screw (23) is threaded onto the inner wall of the mounting plate (21). A screw hole bracket (26) is provided at the end of the mounting plate (21) away from the retainer (20). The inner wall of the screw hole bracket (26) is threaded together with... The front cover (3) is connected to a lens (28), and the inner wall of the front cover (3) is threaded with a threaded bracket (22). The inner wall of the threaded bracket (22) is threaded with a screw (30). The surface of the threaded bracket (22) is provided with a lamp ring (27). The surface of the rear cover (1) and the surface of the cylinder (2) are both provided with sealing grooves (24). The inner wall of the threaded bracket (22) is fixedly connected with a protective bracket (29). The sealing groove (24) is provided with a sealing component (8). The threaded bracket (22) is provided with a protective component (9). The protective component (9) includes a limiting ring (50), the surface of which is fixedly connected to the inner wall of the threaded bracket (22). A telescopic plate (52) is fixedly connected to the inner wall of the limiting ring (50). A pressing plate (55) is fixedly connected to one end of the telescopic plate (52) away from the limiting ring (50). A contact pad (57) is fixedly connected to one end of the pressing plate (55) away from the telescopic plate (52). A spring piece (59) is fixedly connected to the surface of the telescopic plate (52). The spring piece (59) is located away from the telescopic plate (50). 2) One end is fixedly connected to the surface of the extrusion plate (55), and the end of the extrusion plate (55) away from the contact pad (57) is fixedly connected to the inclined plate (56). The inner wall of the threaded frame (22) is provided with a round hole (53), and the inner wall of the round hole (53) is fixedly connected to the elastic rod (51). The telescopic end of the elastic rod (51) is fixedly connected to the bent plate (60), and the end of the bent plate (60) away from the elastic rod (51) is fixedly connected to the extrusion ring (54). The surface of the bent plate (60) is fixedly connected to the top rod (58). The end of the top rod (58) away from the bending plate (60) is in contact with the surface of the screw hole bracket (26), the inner wall of the extrusion ring (54) is in contact with the inclined surface of the inclined plate (56), and the end of the contact pad (57) away from the extrusion plate (55) is in contact with the surface of the lens (28).

2. A straight-tube camera according to claim 1, characterized in that: The retainer (20) is symmetrically arranged with the camera body (6) as the center. The end of the retainer (20) away from the rear cover (1) extends into the interior of the front cover (3). The mounting plate (21) and the screw hole bracket (26) are threadedly connected by the screw rod (23). The screw hole bracket (26) is located inside the front cover (3). The surface of the lens (5) is fixedly connected to the inner wall of the front cover (3). The inner ring wall of the lens (5) is fixedly connected to the surface of the protective frame (29).

3. A straight-tube camera according to claim 2, characterized in that: The surface of the second lens (4) is fixedly connected to the inner wall of the protective frame (29). The lamp ring (27) and the threaded frame (22) are threadedly connected by the screw three (30). The end of the lens (28) away from the screw hole frame (26) is in contact with the inner wall of the protective frame (29). The lamp ring (27) is located at the end of the threaded frame (22) and the first lens (5) that are close to each other. The sealing groove (24) provided on the surface of the rear cover (1) is located inside the cylinder (2). The sealing groove (24) on the surface of the cylinder (2) is located inside the front cover (3).

4. A straight-tube camera according to claim 3, characterized in that: The sealing component (8) includes a rubber ring (41), the inner wall of the rubber ring (41) is in contact with the inner wall of the sealing groove (24), a groove ring (45) is fixedly connected to the inner wall of the sealing groove (24), a triangular block (44) is slidably connected to the inner wall of the groove ring (45), a beveled extrusion ring (43) is provided at one end of the groove ring (45) and the rubber ring (41) that are close to each other, and a sealing gasket (42) is fixedly connected to the other end of the beveled extrusion ring (43) that is away from the rubber ring (41).

5. A straight-tube camera according to claim 4, characterized in that: The number of groove rings (45) is set to two, and the two groove rings (45) are respectively located inside the two sealing grooves (24). Multiple triangular blocks (44) are arranged inside the groove rings (45).

6. A straight-tube camera according to claim 5, characterized in that: The end of the triangular block (44) away from the groove ring (45) is in contact with the surface of the inclined extrusion ring (43), the inner wall of the sealing gasket (42) is in contact with the inner wall of the sealing groove (24), and the inclined surface of the inclined extrusion ring (43) is in contact with the inner wall of the rubber ring (41).

7. A straight-tube camera according to claim 6, characterized in that: The number of telescopic plates (52) is set to multiple, and the multiple telescopic plates (52) are arranged circumferentially with the limiting ring (50) as the center. The number of elastic rods (51) is set to two, and the two elastic rods (51) are arranged symmetrically with the threaded frame (22) as the center.

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