Pipeline all-circumferential corrosion detection device

Abstract

The invention relates to a pipeline all-circumferential corrosion detection device, which comprises: an annular support used for sleeving the outside of a pipeline; the walking mechanism is arranged on the annular support and used for driving the annular support to move in the axial direction of the pipeline; the rotating plate is of an annular structure, and the rotating plate is rotationally connected to one side of the annular support; the plurality of detection probes are arranged on the rotating plate and are used for carrying out corrosion detection on the pipeline; and the rotation driving mechanism is arranged on the annular bracket and is used for driving the rotating plate to rotate so as to drive the plurality of detection probes to carry out full-circumferential corrosion detection on the pipeline. According to the pipeline all-circumferential corrosion detection device provided by the invention, the walking mechanism can drive the whole device to move along the pipeline, and the rotation driving mechanism can drive the rotating plate to rotate along the circumferential direction of the pipeline, so that the detection probe can be driven to carry out all-circumferential corrosion detection on the pipeline, and the working efficiency of pipeline corrosion detection and the convenience during detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and more specifically, to a pipeline full circumferential corrosion detection device. Background Art

[0002] Pipelines will fail due to corrosion, mechanical damage, geological damage, and defects in the pipe material itself during long-term operation. Pipelines in a long-term corrosion state are extremely likely to cause safety hazards during use, and in severe cases, will lead to fires, explosions, and poisoning, affecting the surrounding environment and the lives of the people. Therefore, it is necessary to regularly detect and treat pipeline corrosion.

[0003] Existing pipeline corrosion detection equipment generally needs to enter the pipeline to detect and process the pipeline. Detection can only be carried out after the pipeline stops working, which has a certain impact on production. The invention patent with the application publication number CN106369287A discloses a pipeline corrosion on-line detection device, which includes a detection bracket with a ring structure. A plurality of corrosion monitoring probes are arranged on the detection bracket. A plurality of support rods extending parallel to its axis are arranged on the detection bracket. Driving rollers are arranged at the ends of each support rod. The driving rollers drive the detection bracket to move along the axial direction of the pipeline, and the pipeline is detected by the corrosion monitoring probes on the detection bracket. However, when the above detection device detects pipeline corrosion, it can only detect the axial path of the pipeline passed by the probe during movement driven by the detection bracket, and cannot complete a comprehensive corrosion detection of the circumferential direction of the pipeline. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a pipeline full circumferential corrosion detection device, aiming to solve the problems existing in the prior art.

[0005] According to the present invention, there is provided a pipeline full circumferential corrosion detection device, which includes: A ring bracket for sleeving outside the pipeline; A traveling mechanism arranged on the ring bracket for driving the ring bracket to move along the axial direction of the pipeline; A rotating plate, which is of a ring structure and is rotatably connected to one side of the ring bracket; A plurality of detection probes arranged on the rotating plate for detecting pipeline corrosion; A rotation driving mechanism arranged on the ring bracket for driving the rotating plate to rotate, thereby driving a plurality of the detection probes to perform full circumferential corrosion detection on the pipeline.

[0006] Preferably, the annular bracket includes an upper clamping plate and a lower clamping plate detachably connected together. Both the upper clamping plate and the lower clamping plate are semi-circular arc plate structures, and the upper clamping plate and the lower clamping plate are connected by a connecting member.

[0007] Preferably, the connecting member includes a fixing plate and a fixing bolt. One end of the fixing plate is fixedly arranged on the outer surface of the end of the lower clamping plate, and the other end of the fixing plate extends out of the end of the lower clamping plate by a preset length. The fixing bolt is threadedly connected to the fixing plate, and one end of the fixing bolt passes through the fixing plate and is connected to the upper clamping plate.

[0008] Preferably, the traveling mechanism includes a plurality of support components arranged on the annular bracket. The support component includes a connecting seat, a connecting rod, and an auxiliary wheel. The connecting seat is fixedly arranged on the annular bracket. The first end of the connecting rod is connected to the connecting seat, and the auxiliary wheel is rotatably arranged at the second end of the connecting rod. The auxiliary wheel is used to roll along the outer surface of the pipeline.

[0009] Preferably, a limiting plate is arranged on the outer side of the connecting seat. The connecting rod is rotatably connected to the connecting seat, and a limiting spring is arranged between the limiting plate and the connecting rod.

[0010] Preferably, a traveling driving motor is further included in two relatively arranged support components. The traveling driving motor is fixedly arranged on the connecting rod, and the output shaft of the traveling driving motor is connected to the auxiliary wheel for driving the auxiliary wheel to roll.

[0011] Preferably, a plurality of elastic telescopic rods are arranged on the inner peripheral wall of the annular bracket. One end of the elastic telescopic rod is connected to the annular bracket, and a positioning roller is rotatably arranged at the other end of the elastic telescopic rod.

[0012] Preferably, the elastic telescopic rod includes a sleeve, a telescopic spring, and a movable rod. The sleeve is fixedly arranged on the inner peripheral wall of the annular bracket. The telescopic spring is arranged in the sleeve. The first end of the movable rod is inserted into the sleeve and connected to the telescopic spring. The second end of the movable rod extends out of the sleeve, and the positioning roller is rotatably arranged at the second end of the movable rod.

[0013] Preferably, an annular track groove is formed on one side surface of the annular bracket, and the rotating plate is slidably connected in the annular track groove.

[0014] Preferably, the rotation driving mechanism includes a rotation driving motor and a driving gear. The rotation driving motor is fixedly arranged on the annular bracket. The driving gear is fixedly connected to the output shaft of the rotation driving motor. An arc-shaped rack is fixedly arranged on the outer peripheral surface of the rotating plate, and the driving gear meshes with the arc-shaped rack for transmission.

[0015] The pipeline circumferential corrosion detection device provided by the present invention is provided with a rotating plate on the annular bracket, and the detection probe is arranged on the rotating plate. The rotating plate is driven by a rotating drive mechanism to rotate circumferentially along the pipeline, which can drive the detection probe to perform circumferential corrosion detection on the pipeline, improving the working efficiency and convenience of pipeline corrosion detection. Brief Description of the Drawings

[0016] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features and advantages of the present invention will become clearer.

[0017] Figure 1 Fig. shows the structural schematic diagram of the pipeline circumferential corrosion detection device according to the embodiment of the present invention.

[0018] Figure 2 Fig. shows the side structural schematic diagram of the pipeline circumferential corrosion detection device according to the embodiment of the present invention after removing the traveling mechanism.

[0019] Figure 3 Fig. shows the structural schematic diagram of the annular bracket in the pipeline circumferential corrosion detection device according to the embodiment of the present invention.

[0020] Figure 4 Fig. shows the structural schematic diagram of the elastic telescopic rod in the pipeline circumferential corrosion detection device according to the embodiment of the present invention.

[0021] In the figure: 1. Annular bracket; 11. Upper clamping plate; 12. Lower clamping plate; 13. Fixed plate; 14. Fixed bolt; 101. Annular track groove; 2. Rotating plate; 21. Upper rotating plate; 22. Lower rotating plate; 3. Detection probe; 31. Mounting seat; 4. Rotating drive mechanism; 41. Rotating drive motor; 42. Driving gear; 43. Arc-shaped rack; 5. Support assembly; 51. Connecting seat; 52. Connecting rod; 53. Auxiliary wheel; 54. Limiting plate; 55. Limiting spring; 56. Traveling drive motor; 6. Positioning roller; 7. Elastic telescopic rod; 71. Sleeve; 72. Telescopic spring; 73. Movable rod; 8. Controller. Detailed Embodiments

[0022] The various embodiments of the present invention will be described in more detail below with reference to the drawings. In each drawing, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale.

[0023] The present invention provides a pipeline circumferential corrosion detection device, see Figure 1, the circumferential corrosion detection device for the pipeline includes an annular bracket 1, a traveling mechanism, a rotating plate 2, a rotation driving mechanism 4, and a plurality of detection probes 3. The annular bracket 1 has an annular structure and is used to be sleeved outside the pipeline. The traveling mechanism is arranged on the annular bracket 1 and is used to drive the annular bracket 1 to move axially along the pipeline. The rotating plate 2 has an annular structure, is coaxially arranged with the annular bracket 1, and is rotatably connected to one side of the annular bracket 1. A plurality of detection probes 3 are arranged on the rotating plate 2, and the detection probes 3 are used to detect the corrosion of the pipeline. The rotation driving mechanism 4 is arranged on the annular bracket 1 and is used to drive the rotating plate 2 to rotate, so as to drive a plurality of detection probes 3 to perform circumferential corrosion detection on the pipeline.

[0024] Specifically, the annular bracket 1 includes an upper clamping plate 11 and a lower clamping plate 12 that are detachably connected together. Both the upper clamping plate 11 and the lower clamping plate 12 are semi-circular arc plate structures, and the upper clamping plate 11 and the lower clamping plate 12 are connected by a connecting member. The annular bracket 1 is provided with a detachable connection structure, which is convenient for installation and disassembly on the pipeline. When it is necessary to detect the corrosion of the pipeline, the two semi-circular upper clamping plate 11 and lower clamping plate 12 are butted and spliced and fixed by a connecting member to form the annular bracket 1, so as to support the rotating plate 2 and the detection probes 3 arranged on the rotating plate 2.

[0025] Further, the connecting member includes a fixing plate 13 and a fixing bolt 14. One end of the fixing plate 13 is fixedly arranged on the outer surface of the end of the lower clamping plate 12, and the other end of the fixing plate 13 extends out of the end of the lower clamping plate 12 by a preset length. The fixing bolt 14 is threadedly connected to the fixing plate 13, and one end of the fixing bolt 14 passes through the fixing plate 13 and is connected to the upper clamping plate 11. As Figure 2 shown, in this embodiment, the fixing plate 13 is an arc plate, and the radian of the inner surface of the fixing plate 13 is the same as the radian of the outer peripheral surface of the annular bracket 1, so that the fixing plate 13 can closely fit on the lower clamping plate 12. And when the upper clamping plate 11 and the lower clamping plate 12 are butted and spliced into the annular bracket 1, the extending part of the fixing plate 13 can closely fit on the outer side of the end of the upper clamping plate 11. The fixing plate 13 can be fixedly connected to the end of the lower clamping plate 12 by welding. In this embodiment, a threaded hole for cooperating with the fixing bolt 14 is correspondingly arranged at the end of the upper clamping plate 11. One end of the fixing bolt 14 passes through the fixing plate 13 and is threadedly connected to the threaded hole on the upper clamping plate 11, so as to firmly connect the upper clamping plate 11 and the lower clamping plate 12 together. In other alternative embodiments, the upper clamping plate 11 may not be provided with a threaded hole, and the upper clamping plate 11 can be tightened by screwing the fixing bolt 14 to realize the connection and fixation of the upper clamping plate 11 and the lower clamping plate 12.

[0026] Further, a circular track groove 101 is formed on one side surface of the circular support 1, and the rotating plate 2 is slidably connected in the circular track groove 101. Specifically, the cross-section of the circular track groove 101 can be a "T"-shaped structure. Correspondingly, the cross-section of one end of the rotating plate 2 connected to the circular track groove 101 is also a "T"-shaped structure, so that the rotating plate 2 will not come out when sliding in the circular track groove 101. Refer to Figure 3 , in this embodiment, the circular support 1 is formed by splicing an upper clamping plate 11 and a lower clamping plate 12. The circular track grooves 101 are respectively set as half of a semicircle on the upper clamping plate 11 and the lower clamping plate 12. After the upper clamping plate 11 and the lower clamping plate 12 are butted and spliced together, the track grooves on the upper clamping plate 11 and the lower clamping plate 12 are communicated with each other at the ends; correspondingly, the rotating plate 2 is composed of a semi-circular upper rotating plate 21 and a lower rotating plate 22. Before the upper clamping plate 11 and the lower clamping plate 12 are butted and spliced, the upper rotating plate 21 and the lower rotating plate 22 can respectively slide into one end of the circular track groove 101 of the upper clamping plate 11 and one end of the circular track groove 101 of the lower clamping plate 12. After the upper clamping plate 11 and the lower clamping plate 12 are connected and spliced together to form the circular support 1, the two ends of the upper rotating plate 21 and the lower rotating plate 22 are abutted against each other, which facilitates the synchronous rotation of the upper rotating plate 21 and the lower rotating plate 22.

[0027] Further, the rotation driving mechanism 4 includes a rotation driving motor 41 and a driving gear 42. The rotation driving motor 41 is fixedly arranged on the circular support 1, the driving gear 42 is fixedly connected to the output shaft of the rotation driving motor 41, an arc-shaped rack 43 is fixedly arranged on the outer peripheral surface of the rotating plate 2, and the driving gear 42 is in meshing transmission with the arc-shaped rack 43. In this embodiment, the arc-shaped rack 43 is fixedly connected to the outer peripheral surface of the upper rotating plate 21. The rotation driving motor 41 is a forward and reverse rotation motor. The rotation driving motor 41 drives the driving gear 42 to rotate, so that the driving gear 42 drives the arc-shaped rack 43 to rotate, and then the upper rotating plate 21 on the upper clamping plate 11 rotates along the circular track groove 101, and then the lower rotating plate 22 is pushed to rotate synchronously along the circular track groove 101. The forward and reverse rotation of the rotation driving motor 41 can drive the rotating plate 2 to rotate periodically in a reciprocating manner, and the rotation interval of the rotating plate 2 enables the detection probe 3 thereon to fully detect the corrosion of the pipeline surface. As Figure 2 shown, in this embodiment, two detection probes 3 are respectively arranged on the upper rotating plate 21 and the lower rotating plate 22. The two detection probes 3 on the upper rotating plate 21 and the two detection probes 3 on the lower rotating plate 22 are respectively arranged opposite to each other. The forward and reverse rotation of the rotation driving motor 41 can ensure that the detection probe 3 can perform full circumferential corrosion detection on the pipeline, realizing full coverage in the circumferential direction of the pipeline, and the detection is more comprehensive.

[0028] Further, a mounting seat 31 is provided on the side surface of the rotating plate 2, and the detection probe 3 is mounted on the mounting seat 31. The detection probe 3 is arranged pointing to the pipeline. Under the action of multiple detection probes 3, the detection area can be made wider.

[0029] Further, a plurality of elastic telescopic rods 7 are provided on the inner peripheral wall of the annular bracket 1. One end of the elastic telescopic rod 7 is connected to the annular bracket 1, and a positioning roller 6 is rotatably arranged at the other end of the elastic telescopic rod 7. Refer to Figure 4 , in this embodiment, the elastic telescopic rod 7 includes a sleeve 71, a telescopic spring 72 and a movable rod 73. The sleeve 71 is fixedly arranged on the inner peripheral wall of the annular bracket 1. The telescopic spring 72 is arranged in the sleeve 71. The first end of the movable rod 73 is inserted into the sleeve 71 and connected to the telescopic spring 72. The second end of the movable rod 73 extends out of the sleeve 71, and the positioning roller is rotatably arranged at the second end of the movable rod 73. Wherein, an inwardly extending annular baffle is provided at one end of the sleeve 71 away from the inner peripheral wall of the annular bracket 1, and an outwardly extending annular flange is provided at one end of the movable rod 73 connected to the telescopic spring 72. The outer diameter of the annular flange is larger than the inner diameter of the annular baffle, so as to prevent the movable rod 73 from disengaging from the sleeve 71. By providing a plurality of elastic telescopic rods 7 on the annular bracket 1 and providing positioning rollers 6 on the elastic telescopic rods 7, the positioning rollers 6 can elastically abut against the outer wall of the pipeline, thereby playing a role in assisting movement and facilitating the annular bracket 1 to surround the outside of the pipeline. In this embodiment, two elastic telescopic rods 7 are provided on the inner peripheral wall of the annular bracket 1. The two elastic telescopic rods 7 are arranged oppositely and are respectively arranged in the middle of the upper clamping plate 11 and the lower clamping plate 12.

[0030] Further, the traveling mechanism includes a plurality of support components 5 disposed on the annular bracket 1. The support component 5 includes a connecting seat 51, a connecting rod 52, and an auxiliary wheel 53. The connecting seat 51 is fixedly provided on the annular bracket 1. The first end of the connecting rod 52 is connected to the connecting seat 51. The auxiliary wheel 53 is rotatably disposed at the second end of the connecting rod 52. The auxiliary wheel 53 is used to roll along the outer surface of the pipeline. Specifically, the connecting seat 51 has a U-shaped structure. The connecting rod 52 is rotatably connected to the connecting seat 51. The connecting rod 52 can perform a centripetal movement toward the center of the pipeline. A limiting plate 54 is provided on the outer side of the connecting seat 51. A limiting spring 55 is provided between the limiting plate 54 and the connecting rod 52. The limiting spring 55 is a cylindrical compression spring. The limiting spring 55 can apply an elastic force to swing the connecting rod 52 inward. Under the action of the limiting spring 55, the auxiliary wheel 53 at the end of the connecting rod 52 can be pressed against the surface of the pipeline. By adopting the above structure, during use, the auxiliary wheel 53 can always be pressed against the pipeline surface for rolling, so as to better adapt to pipelines with different diameters.

[0031] Further, in the traveling mechanism, in two relatively arranged support components 5, a traveling drive motor 56 is further included. The traveling drive motor 56 is fixedly provided on the connecting rod 52. The output shaft of the traveling drive motor 56 is connected to the auxiliary wheel 53 for driving the auxiliary wheel 53 to roll. See Figure 1 , in this embodiment, the traveling drive mechanism includes four support components 5. Among them, three support components 5 are provided on the upper clamping plate 11, and one support component 5 is provided on the lower clamping plate 12. The support component 5 on the lower clamping plate 12 is disposed in the middle of the lower clamping plate 12. One of the support components on the upper clamping plate 11 is disposed in the middle of the upper clamping plate 11 and is relatively arranged with the support component on the lower clamping plate 12. The other two support components on the upper clamping plate 11 are respectively disposed at both ends of the upper clamping plate 11 and are relatively arranged with each other. In this embodiment, traveling drive motors 56 are provided on the connecting rods 52 of the support components 5 located at both ends of the upper clamping plate 11. The traveling drive motors 56 drive the auxiliary wheels 53 to rotate, thereby driving the whole device to travel along the pipeline.

[0032] A controller 8 is further provided on the annular bracket 1. The traveling mechanism and the rotation drive mechanism 4 are both electrically connected to the controller 8. As Figure 1 shown, in this embodiment, the controller 8 is provided on the upper clamping plate 11. The controller 8 is used to control the step-by-step rotation of the traveling drive motor 56, and also control the forward and reverse rotation of the rotation drive motor 41. Thus, when performing corrosion detection on the pipeline, after controlling the whole device to step and stop, the controller 8 controls the rotation plate 2 to rotate to drive the detection probe 3 to perform corrosion detection on the pipeline.

[0033] When using the pipeline circumferential corrosion detection device according to the embodiment of the present invention to detect a pipeline, the upper clamping plate 11 and the lower clamping plate 12 are joined and docked through a connecting member to form an annular bracket 1, which is sleeved outside the pipeline to be detected. At this time, under the action of the positioning roller 6, it is convenient to position and surround the annular bracket 1 outside the pipeline. At the same time, the auxiliary wheel 53 in the traveling mechanism is elastically clamped on the surface of the pipeline under the action of the limiting spring 55, and the auxiliary wheel 53 is driven to rotate under the driving action of the traveling driving motor 56, so that the whole device moves forward along the pipeline. The controller 8 can control the start and stop of the traveling driving motor 56. After the device travels a preset distance, the controller 8 controls the traveling driving motor 56 to stop rotating, and the annular bracket 1 is positioned on the pipeline. Then the controller 8 controls the rotation driving motor 41 to rotate, driving the rotating plate 2 to reciprocate periodically. The detection probe 3 on the rotating plate 2 can fully detect the corrosiveness of the pipeline surface, realizing the circumferential corrosion detection of the pipeline.

[0034] For the pipeline circumferential corrosion detection device provided by the present invention, a rotating plate is provided on the annular bracket, and the detection probe is arranged on the rotating plate. The rotating plate is driven to rotate along the circumferential direction of the pipeline through a rotation driving mechanism, which can drive the detection probe to perform circumferential corrosion detection on the pipeline, improving the working efficiency and convenience of pipeline corrosion detection.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0036] Finally, it should be noted that obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A circumferential corrosion detection device for pipelines, characterized in that, it includes: A circular bracket for sleeving outside the pipeline; A traveling mechanism arranged on the circular bracket for driving the circular bracket to move along the axial direction of the pipeline; A rotating plate which is a ring structure, and the rotating plate is rotatably connected to one side of the circular bracket; A plurality of detection probes arranged on the rotating plate for corrosion detection of the pipeline; A rotation driving mechanism arranged on the circular bracket for driving the rotation of the rotating plate, thereby driving the plurality of detection probes to perform circumferential corrosion detection on the pipeline.

2. The circumferential corrosion detection device for pipelines according to claim 1, characterized in that, The circular bracket includes an upper clamping plate and a lower clamping plate detachably connected together. Both the upper clamping plate and the lower clamping plate are semi-circular arc plate structures, and the upper clamping plate and the lower clamping plate are connected by a connecting member.

3. The circumferential corrosion detection device for pipelines according to claim 2, characterized in that, The connecting member includes a fixing plate and a fixing bolt. One end of the fixing plate is fixedly arranged on the outer surface of the end of the lower clamping plate, the other end of the fixing plate extends a preset length beyond the end of the lower clamping plate, the fixing bolt is threadedly connected to the fixing plate, and one end of the fixing bolt passes through the fixing plate and is connected to the upper clamping plate.

4. The circumferential corrosion detection device for pipelines according to claim 1, characterized in that, The traveling mechanism includes a plurality of support components arranged on the circular bracket. The support component includes a connecting seat, a connecting rod and an auxiliary wheel. The connecting seat is fixedly arranged on the circular bracket, the first end of the connecting rod is connected to the connecting seat, the auxiliary wheel is rotatably arranged at the second end of the connecting rod, and the auxiliary wheel is used for rolling along the outer surface of the pipeline.

5. The circumferential corrosion detection device for pipelines according to claim 4, characterized in that, A limiting plate is arranged on the outer side of the connecting seat. The connecting rod is rotatably connected to the connecting seat, and a limiting spring is arranged between the limiting plate and the connecting rod.

6. The circumferential corrosion detection device for pipelines according to claim 4, characterized in that, Among two relatively arranged support components, there is also a traveling driving motor. The traveling driving motor is fixedly arranged on the connecting rod, and the output shaft of the traveling driving motor is connected to the auxiliary wheel for driving the auxiliary wheel to roll.

7. The circumferential corrosion detection device for pipelines according to claim 1, characterized in that, A plurality of elastic telescopic rods are arranged on the inner peripheral wall of the circular bracket. One end of the elastic telescopic rod is connected to the circular bracket, and a positioning roller is rotatably arranged at the other end of the elastic telescopic rod.

8. The circumferential corrosion detection device for pipelines according to claim 7, characterized in that, The elastic telescopic rod includes a sleeve, a telescopic spring and a movable rod. The sleeve is fixedly arranged on the inner peripheral wall of the annular bracket. The telescopic spring is arranged in the sleeve. The first end of the movable rod is inserted into the sleeve and connected to the telescopic spring. The second end of the movable rod extends out of the sleeve, and the positioning pipe wheel is rotatably arranged at the second end of the movable rod.

9. The circumferential corrosion detection device for a pipeline according to claim 1, wherein, a circumferential track groove is formed on one side surface of the annular bracket, and the rotating plate is slidably connected in the circumferential track groove.

10. The circumferential corrosion detection device for a pipeline according to claim 1, wherein, the rotation driving mechanism includes a rotation driving motor and a driving gear. The rotation driving motor is fixedly arranged on the annular bracket. The driving gear is fixedly connected to the output shaft of the rotation driving motor. An arc-shaped rack is fixedly arranged on the outer peripheral surface of the rotating plate, and the driving gear meshes with the arc-shaped rack for transmission.

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