Multi-angle adjustable power distribution monitoring device

Abstract

The application relates to the technical field of monitoring equipment, and discloses a multi-angle adjusting power distribution monitoring equipment, which comprises a fixing frame, rotating frames are rotationally connected between the inner walls of the two sides of the fixing frame, a locking assembly for adjusting the angle of the rotating frame is arranged on one side of the fixing frame, a connecting shell is fixedly connected to the bottom outer wall of the rotating frame, a shell body is rotationally connected to the bottom of the connecting shell, and camera heads are rotationally connected to the outer walls of the two sides of the shell body. The fixing frame is installed on the top wall or the side wall of a power distribution room through screws, the angle of the rotating frame is adjusted according to the actual installation position, the rotating frame is fixed through the locking assembly, the camera heads at the two ends of the shell body are independently adjusted in angle through the adjusting assembly, the two camera heads are respectively aligned with the positions to be monitored, and the multi-angle adjusting effect of the monitoring equipment is improved from the aspects of the installation position mode, the use position mode and the like.

Description

Technical Field

[0001] This invention relates to the field of monitoring equipment technology, specifically to a power distribution monitoring device with multi-angle adjustment. Background Technology

[0002] Large power distribution rooms typically house numerous electrical devices for power supply, making safety within these rooms paramount. Cameras are usually installed for monitoring. During installation, the camera's tilt angle and beam direction are typically adjusted; subsequent adjustments require staff to climb to a higher position to readjust the camera.

[0003] A search revealed Chinese patent CN217273166U, which discloses a power distribution monitoring device, including a camera, a position adjustment mechanism, a tilt angle adjustment mechanism, and a monitoring direction adjustment mechanism. However, it still has the following drawbacks: the monitoring installation locations of different power distribution rooms are different, and the monitoring range and monitoring location are also different. Although the existing power distribution monitoring device solves the problem of electric adjustment, its applicable range is relatively narrow. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a multi-angle adjustable power distribution monitoring device. The main purpose is to solve the problem that, although existing power distribution monitoring devices can be electrically adjusted, their applicable range is relatively narrow, as the monitoring installation locations of different power distribution rooms vary, and the monitoring range and location are also different.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A multi-angle adjustable power distribution monitoring device includes a fixed frame, a rotating frame rotatably connected between the inner walls of the two sides of the fixed frame, a locking component for adjusting the angle of the rotating frame on one side of the fixed frame, a connecting shell fixedly connected to the bottom outer wall of the rotating frame, a housing rotatably connected to the bottom of the connecting shell, cameras rotatably connected to the outer walls of both sides of the housing, a power component for rotating the housing inside the connecting shell, and an adjustment component for independently rotating the two cameras inside the housing.

[0009] Furthermore, the adjustment assembly includes two worm gears rotatably connected inside the housing. The rotation shafts of both cameras pass through the housing and are keyed to worm wheels that mesh with the worm gears. Driven gears are keyed to the outer circumference of both worm gears near their bottom ends. A fixed plate is fixedly connected to one inner wall of the housing. A first reduction motor is fixedly connected to the top of the fixed plate. One end of the output shaft of the first reduction motor passes through the fixed plate and is fixedly connected to a rotating plate. A second reduction motor is fixedly connected to the top of the rotating plate. One end of the output shaft of the second reduction motor passes through the rotating plate and is keyed to a driving gear that meshes with the driven gear. A positioning assembly for positioning the rotation position of the rotating plate is provided at the bottom of the fixed plate. A locking assembly for fixing the angle of the cameras is provided on both inner walls of the housing.

[0010] Based on the aforementioned scheme, the positioning component includes a magnetic block one, which is fixedly connected to the bottom of the fixed plate. Three magnetic blocks two are fixedly connected to the top of the rotating plate and the end away from the reduction motor two. All three magnetic blocks two can be attracted to the magnetic block one.

[0011] As a further embodiment of the present invention, the engaging component is a disc, which is fixedly connected to the outer circumference of the rotating shaft of the camera. Multiple mounting slots are provided on the outer circumference of the disc, and a magnetic block is fixedly connected in the mounting slot. Mounting brackets are fixedly connected to the inner walls of both sides of the housing. A sliding groove is provided in the mounting bracket, and an iron block that can be attracted to the magnetic block is slidably connected in the sliding groove. A spring is fixedly connected to the top of the iron block, and one end of the spring is fixed to the top inner wall of the sliding groove.

[0012] Furthermore, each of the mounting slots has an inclined surface on both sides, allowing the iron block to be embedded into the mounting slot through the inclined surface.

[0013] Based on the aforementioned scheme, the power assembly includes a second reduction gear, which is rotatably connected to the bottom inner wall of the connecting shell. The bottom end of the second reduction gear passes through the connecting shell and is fixed to the shell. A servo motor is fixedly connected to the top inner wall of the connecting shell. One end of the output shaft of the servo motor is keyed to a first reduction gear, and the first reduction gear meshes with the second reduction gear.

[0014] As a further embodiment of the present invention, an electrical module mounting plate is fixedly connected to the top inner wall of the connecting shell, and a communication module, a data processing module and an image analysis module are provided at the bottom of the electrical module mounting plate, and the communication module, the data processing module and the image analysis module are electrically connected to two cameras.

[0015] Furthermore, the locking assembly includes multiple insertion holes evenly distributed on both sides of the rotating frame. Threaded holes are provided on both sides of the fixed frame, and a semi-threaded rod is threaded into each threaded hole. One end of the semi-threaded rod is fixedly connected to a hexagonal end, and the other end of the semi-threaded rod is inserted into the insertion hole. Alternating grooves for avoiding the semi-threaded rod are provided on both outer walls of the rotating frame.

[0016] Based on the aforementioned scheme, rubber rings are fixedly connected to the outer circumference of both semi-threaded rods, and the rubber rings bulge outward from both sides toward the middle.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a power distribution monitoring device with multi-angle adjustment, which has the following beneficial effects:

[0019] 1. This invention involves mounting a fixed frame on the top or side wall of the power distribution room with screws, adjusting the angle of the rotating frame according to the actual installation position, and fixing it with a locking assembly. Then, the adjustment assembly allows the cameras at both ends of the housing to be independently adjusted so that each camera is aimed at the location to be monitored. Finally, a power assembly drives the housing to slowly rotate the two cameras, thereby effectively increasing the monitoring range of the cameras. This improves the multi-angle adjustment effect of the monitoring equipment from multiple aspects, including installation and usage methods.

[0020] 2. In this invention, the rotation of a first geared motor causes a rotating plate to drive a second geared motor to rotate to a suitable position, and the driving gear meshes with one of the driven gears. Then, the second geared motor causes the driving gear to drive the driven gear, worm, worm wheel and camera to rotate to a suitable angle, thereby adjusting the shooting angle of the camera. Then, the first geared motor is rotated in the opposite direction to a suitable position, so that the shooting angle of the other camera is also adjusted.

[0021] 3. This invention uses the rotation of the camera to drive the rotation of the disc, thereby causing the magnetic block three to detach from the iron block until it rotates to a suitable position. Then, the iron block re-attaches and fixes itself to one of the magnetic blocks three, thereby adjusting and fixing the camera. At the same time, the spring and inclined plane effectively improve the locking effect of the disc while ensuring the rotation of the disc.

[0022] 4. The present invention uses a servo motor to rotate a first reduction gear, which in turn drives a second reduction gear to rotate. The rotation of the second reduction gear causes the housing to slowly rotate the camera to a suitable position, thereby effectively improving the monitoring range of the camera.

[0023] 5. This invention processes images captured by a camera and converts them into digital image information through an image analysis module. Then, the digital image information is analyzed through a data processing module to assist staff in monitoring and judgment. At the same time, it can be transmitted to a local area network through a communication module, enabling the monitoring equipment to be remotely monitored and controlled.

[0024] 6. The present invention rotates the hexagonal end, causing the hexagonal end to move the semi-threaded rod inward along the threaded hole, thereby inserting the semi-threaded rod into the insertion hole, and thus locking and fixing the angle of the rotating frame after adjustment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the front three-dimensional structure of a multi-angle adjustable power distribution monitoring device proposed in this invention;

[0026] Figure 2 This is a schematic cross-sectional view of the connection shell structure of a multi-angle adjustable power distribution monitoring device proposed in this invention.

[0027] Figure 3 This is a schematic cross-sectional view of the housing structure of a multi-angle adjustable power distribution monitoring device proposed in this invention.

[0028] Figure 4 This is a schematic diagram of the internal structure of the housing of a multi-angle adjustable power distribution monitoring device proposed in this invention;

[0029] Figure 5 This is an enlarged structural diagram of section A of a multi-angle adjustable power distribution monitoring device proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the internal structure of the connection shell of a multi-angle adjustable power distribution monitoring device proposed in this invention.

[0031] Figure 7 This is a partially exploded structural diagram of a multi-angle adjustable power distribution monitoring device proposed in this invention.

[0032] Figure 8 This is an enlarged structural diagram of section B of a multi-angle adjustable power distribution monitoring device proposed in this invention.

[0033] In the diagram: 1. Connecting shell; 2. Fixing frame; 3. Rotating frame; 4. Housing; 5. Camera; 6. Electrical module mounting plate; 7. Servo motor; 8. Reduction gear one; 9. Reduction gear two; 10. Fixing plate; 11. Reduction motor one; 12. Rotating plate; 13. Reduction motor two; 14. Driving gear; 15. Driven gear; 16. Worm; 17. Disc; 18. Worm wheel; 19. Magnetic block one; 20. Magnetic block two; 21. Spring; 22. Slide groove; 23. Iron block; 24. Inclined surface; 25. Mounting groove; 26. Magnetic block three; 27. Mounting frame; 28. Communication module; 29. ​​Data processing module; 30. Image analysis module; 31. Threaded hole; 32. Hexagonal end; 33. Semi-threaded rod; 34. Alternating ring groove; 35. Insertion hole; 36. Rubber ring sleeve. Detailed Implementation

[0034] 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.

[0035] Reference Figures 1-8 A multi-angle adjustable power distribution monitoring device includes a fixed frame 2, a rotating frame 3 rotatably connected between the inner walls of both sides of the fixed frame 2, a locking component for adjusting the angle of the rotating frame 3 on one side of the fixed frame 2, a connecting shell 1 fixed to the bottom outer wall of the rotating frame 3 by bolts, a shell 4 rotatably connected to the bottom of the connecting shell 1, and cameras 5 rotatably connected to the outer walls of both sides of the shell 4. A power component for rotating the shell 4 is provided inside the connecting shell 1, and an adjustment component for independently rotating the two cameras 5 is provided inside the shell 4. The fixed frame 2 is installed on the top or side wall of the power distribution room with screws. The angle of the rotating frame 3 is adjusted according to the actual installation position and fixed by the locking component. The adjustment component allows the cameras 5 at both ends of the shell 4 to independently adjust their angles, aligning each camera 5 with the location to be monitored. The power component then drives the shell 4 to slowly rotate the two cameras 5, effectively increasing the monitoring range of the cameras 5. This improves the multi-angle adjustment effect of the monitoring device from multiple aspects, including installation and use.

[0036] In this invention, the adjustment assembly includes two worm gears 16, which are rotatably connected inside the housing 4. The rotation shafts of the two cameras 5 pass through the housing 4 and are keyed to worm wheels 18 that mesh with the worm gears 16. Driven gears 15 are keyed to the outer circumference of the two worm gears 16 near their bottom ends. A fixing plate 10 is bolted to one inner wall of the housing 4. A first gear reduction motor 11 is bolted to the top of the fixing plate 10. One end of the output shaft of the first gear reduction motor 11 passes through the fixing plate 10 and is bolted to a rotating plate 12. A second gear reduction motor 13 is bolted to the top of the rotating plate 12. One end of the output shaft of the second gear reduction motor 13 passes through the rotating plate 12 and is keyed to a driving gear 14 that meshes with the driven gears 15. The bottom of the fixing plate 10 is provided with a counterweight to the rotating plate. The positioning component for positioning the rotation position of 12, and the inner walls on both sides of the housing 4 are provided with locking components for fixing the angle of the camera 5. By starting the first reduction motor 11, the rotation of the first reduction motor 11 causes the rotating plate 12 to drive the second reduction motor 13 to rotate to a suitable position, and the driving gear 14 meshes with one of the driven gears 15. Then, the second reduction motor 13 is started, causing the second reduction motor 13 to rotate and drive the driven gear 15 to rotate through the driving gear 14. The rotation of the driven gear 15 causes the worm gear 16 to drive the worm wheel 18 and the camera 5 to rotate to a suitable angle, thereby adjusting the shooting angle of the camera 5. Then, the first reduction motor 11 is rotated in the opposite direction, causing the driving gear 14 to mesh with the other driven gear 15, thereby adjusting the shooting angle of the other camera 5 as well.

[0037] In this invention, the positioning component includes a magnetic block 19, which is fixed to the bottom of the fixing plate 10 by bolts. Three magnetic blocks 20 are fixed to the top of the rotating plate 12 and the end away from the geared motor 13 by bolts. All three magnetic blocks 20 can be attracted to the magnetic block 19. At the same time, when the driving gear 14 and the driven gear 15 mesh, the magnetic block 19 and the magnetic blocks 20 are in a coaxial position. According to the principle of opposite poles attracting each other, the magnetic blocks 19 and the magnetic blocks 20 attract and fix each other, thereby making the meshing of the driving gear 14 and the driven gear 15 more stable.

[0038] In this invention, the engaging assembly is a disc 17, which is fixed to the outer circumference of the rotating shaft of the camera 5 by bolts. Multiple mounting slots 25 are formed on the outer circumference of the disc 17. A magnetic block 26 is fixed to each mounting slot 25 by bolts. Mounting brackets 27 are fixed to the inner walls of both sides of the housing 4 by bolts. Sliding grooves 22 are formed within the mounting brackets 27. An iron block 23, which can attract the magnetic block 26, is slidably connected within the sliding grooves 22. A spring 21 is fixed to the top of the iron block 23 by bolts, and one end of the spring 21 is connected to the sliding groove. The top inner wall of 22 is fixed. At the same time, the rotation of camera 5 drives the rotation of disk 17, thereby causing magnetic block 26 to detach from iron block 23 until it rotates to a suitable position. Iron block 23 is then re-attached and fixed to one of the magnetic blocks 26, thereby adjusting and fixing camera 5. Both sides of multiple mounting slots 25 are provided with inclined surfaces 24, so that iron block 23 can be embedded into the mounting slot 25 through the inclined surfaces 24. Thus, the spring 21 can effectively improve the locking effect of disk 17 while ensuring the rotation of disk 17.

[0039] In this invention, the power assembly includes a second reduction gear 9, which is rotatably connected to the bottom inner wall of the connecting housing 1. The bottom end of the second reduction gear 9 passes through the connecting housing 1 and is fixed to the housing 4. A servo motor 7 is bolted to the top inner wall of the connecting housing 1. One end of the output shaft of the servo motor 7 is keyed to a first reduction gear 8, and the first reduction gear 8 meshes with the second reduction gear 9. By starting the servo motor 7, the rotation of the servo motor 7 causes the first reduction gear 8 to drive the second reduction gear 9 to rotate. The rotation of the second reduction gear 9 causes the housing 4 to slowly rotate the camera 5 to a suitable position, thereby effectively improving the monitoring range of the camera 5. An electrical module mounting plate 6 is fixed to the top inner wall of the shell 1 by bolts. The bottom of the electrical module mounting plate 6 is equipped with a communication module 28, a data processing module 29, and an image analysis module 30. The communication module 28, the data processing module 29, and the image analysis module 30 are electrically connected to two cameras 5. The image analysis module 30 processes the images captured by the cameras 5 and converts them into digital image information. Then, the data processing module 29 analyzes the digital image information to assist the staff in monitoring and judgment. At the same time, it can be connected to the local area network through the communication module 28 for transmission, so that the monitoring equipment can be remotely monitored and controlled.

[0040] In this invention, the locking assembly includes multiple insertion holes 35, which are evenly distributed on both sides of the rotating frame 3. Threaded holes 31 are provided on both sides of the fixed frame 2. A semi-threaded rod 33 is threaded into each threaded hole 31. A hexagonal end 32 is welded to one end of the semi-threaded rod 33, and the other end of the semi-threaded rod 33 is inserted into the insertion hole 35. Alternating grooves 34 are provided on the outer walls of both sides of the rotating frame 3 to allow the semi-threaded rod 33 to move inward along the threaded hole 31. By rotating the hexagonal end 32, the semi-threaded rod 33 is moved inward along the threaded hole 31, thus inserting the semi-threaded rod 33 into the insertion hole 35, thereby locking and fixing the adjusted angle of the rotating frame 3. Rubber rings 36 are bonded to the outer circumference of both semi-threaded rods 33. The rubber rings 36 protrude outward from both sides towards the middle, effectively improving the fit between the semi-threaded rod 33 and the insertion hole 35.

[0041] The working principle of this embodiment is as follows: In use, the fixing bracket 2 is installed on the top or side wall of the power distribution room using screws. Then, the angle of the rotating bracket 3 is adjusted according to the actual installation position. By rotating the hexagonal end 32, the hexagonal end 32 drives the semi-threaded rod 33 to move inward along the threaded hole 31, thereby inserting the semi-threaded rod 33 into the insertion hole 35, thus locking and fixing the adjusted angle of the rotating bracket 3. Then, the first reduction motor 11 is started. The rotation of the first reduction motor 11 causes the rotating plate 12 to drive the second reduction motor 13 to rotate to a suitable position, and the driving gear 14 meshes with one of the driven gears 15. Then, the second reduction motor 13 is started, causing it to rotate and drive the driven gear 15 through the driving gear 14. The rotation of the driven gear 15 causes the worm gear 16 to drive the worm wheel 18 and the camera 5 to rotate to a suitable angle, thereby adjusting the shooting angle of the camera 5. Then, the first reduction motor 11 is rotated in the opposite direction, causing the driving gear 14 to mesh with the other driven gear 15, thereby adjusting the shooting angle of the other camera 5 as well. Simultaneously, when the driving gear 14 meshes with the driven gear 15, magnetic block 19 and magnetic block 20 are coaxially positioned. Based on the principle of opposite poles attracting each other, magnetic blocks 19 and 20 attract and fix each other, thus making the meshing of the driving gear 14 and driven gear 15 more stable. At the same time, the rotation of the camera 5 drives the rotation of the disc 17, causing magnetic block 26 to detach from the iron block 23 until it rotates to a suitable position. The iron block 23 then re-attracts and fixes itself to one of the magnetic blocks 26, thus adjusting and fixing the camera 5. Meanwhile, the spring 21 and inclined plane 24 effectively improve the locking effect of the disc 17 while ensuring its rotation, allowing the cameras 5 at both ends of the housing 4 to be independently adjustable. Then, the servo motor 7 is activated, causing the reduction gear 18 to drive the reduction gear 29 to rotate. The rotation of the reduction gear 29 causes the housing 4 to slowly rotate the camera 5 to a suitable position, effectively increasing the monitoring range of the camera 5. This improves the multi-angle adjustment effect of the monitoring equipment from multiple aspects, including installation and usage methods.

[0042] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0043] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-angle adjustable power distribution monitoring device, comprising a mounting frame (2), characterized in that, A rotating frame (3) is rotatably connected between the inner walls of the two sides of the fixed frame (2). A locking component for adjusting the angle of the rotating frame (3) is provided on one side of the fixed frame (2). A connecting shell (1) is fixedly connected to the bottom outer wall of the rotating frame (3). A housing (4) is rotatably connected to the bottom of the connecting shell (1). Cameras (5) are rotatably connected to both outer walls of the housing (4). A power component for rotating the housing (4) is provided inside the connecting shell (1). An adjustment component for allowing the two cameras (5) to rotate independently is provided inside the housing (4). The adjustment assembly includes two worm gears (16), which are rotatably connected inside the housing (4). The rotation shafts of the two cameras (5) pass through the housing (4) and are keyed to worm wheels (18) that mesh with the worm gears (16). Driven gears (15) are keyed to the outer circumference of the two worm gears (16) near their bottom ends. A fixing plate (10) is fixedly connected to the inner wall of one side of the housing (4). A reduction motor (11) is fixedly connected to the top of the fixing plate (10). One end of the output shaft passes through the fixed plate (10) and is fixedly connected to the rotating plate (12). The top of the rotating plate (12) is fixedly connected to the second gear motor (13). One end of the output shaft of the second gear motor (13) passes through the rotating plate (12) and is keyed to the driving gear (14) that can mesh with the driven gear (15). The bottom of the fixed plate (10) is provided with a positioning component for positioning the rotation position of the rotating plate (12). Both sides of the inner wall of the housing (4) are provided with a locking component for fixing the angle of the camera (5). The positioning component includes a magnetic block one (19), which is fixedly connected to the bottom of the fixed plate (10). Three magnetic blocks two (20) are fixedly connected to the top of the rotating plate (12) and the end away from the geared motor two (13). All three magnetic blocks two (20) can be attracted to the magnetic block one (19). The engaging assembly is a disc (17), which is fixedly connected to the outer circumference of the rotating shaft of the camera (5). Multiple mounting slots (25) are provided on the outer circumference of the disc (17). A magnetic block three (26) is fixedly connected in the mounting slot (25). Mounting brackets (27) are fixedly connected to the inner walls on both sides of the housing (4). A sliding groove (22) is provided in the mounting bracket (27). An iron block (23) that can be attracted to the magnetic block three (26) is slidably connected in the sliding groove (22). A spring (21) is fixedly connected to the top of the iron block (23), and one end of the spring (21) is fixed to the top inner wall of the sliding groove (22). The power assembly includes a second reduction gear (9), which is rotatably connected to the bottom inner wall of the connecting shell (1). The bottom end of the second reduction gear (9) passes through the connecting shell (1) and is fixed to the shell (4). A servo motor (7) is fixedly connected to the top inner wall of the connecting shell (1). One end of the output shaft of the servo motor (7) is keyed to a first reduction gear (8), and the first reduction gear (8) meshes with the second reduction gear (9).

2. The multi-angle adjustable power distribution monitoring equipment according to claim 1, characterized in that, Both sides of the multiple mounting slots (25) are provided with inclined surfaces (24) so ​​that the iron block (23) can be embedded into the mounting slot (25) through the inclined surfaces (24).

3. The multi-angle adjustable power distribution monitoring equipment according to claim 1, characterized in that, The top inner wall of the connecting shell (1) is fixedly connected to an electrical module mounting plate (6). The bottom of the electrical module mounting plate (6) is provided with a communication module (28), a data processing module (29) and an image analysis module (30), and the communication module (28), the data processing module (29) and the image analysis module (30) are electrically connected to two cameras (5).

4. The multi-angle adjustable power distribution monitoring equipment according to claim 1, characterized in that, The locking assembly includes multiple insertion holes (35), which are evenly distributed on both sides of the rotating frame (3). The fixed frame (2) has threaded holes (31) on both sides. A semi-threaded rod (33) is threadedly connected to the threaded hole (31). One end of the semi-threaded rod (33) is fixedly connected to a hexagonal end (32). The other end of the semi-threaded rod (33) is inserted into the insertion hole (35). The outer walls of both sides of the rotating frame (3) are provided with clearance annular grooves (34) to allow the semi-threaded rod (33) to be moved.

5. The multi-angle adjustable power distribution monitoring equipment according to claim 4, characterized in that, Both of the two semi-threaded rods (33) are fixedly connected to rubber rings (36) on their outer circumferences. The rubber rings (36) bulge outward from both sides toward the middle.

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