Connector seal housing

Abstract

The utility model discloses a connector sealing shell, including installation main seat and protection shell body, still include first connector of installation on installation main seat, install on the adjusting assembly of installation main seat, install on the connecting seat of adjusting assembly output, install on the push plate subassembly and press assembly of connecting seat, install on the transmission assembly of connecting seat, the clamping block of sliding connection on connecting seat, install on the external joint of protection shell body, install on the spring assembly of elastic adjusting assembly and install between push plate subassembly and clamping block of connecting seat. Through the mode of clamping, the protection shell main part is clamped quickly, and when disassembling, through the adjusting press assembly, the transmission assembly is driven to move the clamping block, after the restriction of protection shell main part is removed, the protection shell main part is pushed out through the push plate subassembly, so that the staff can disassemble the protection shell main part quickly, and the convenience of large quantities of installation and disassembly work is fully improved.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, specifically to a connector sealing shell. Background Technology

[0002] As a core component ensuring connector performance, the connector sealing shell is a key line of defense for ensuring its stable operation in complex environments. It can effectively block external damage such as moisture, dust, and corrosive gases. Its application range covers high-requirement scenarios such as electronic equipment, communication base stations, and electronic control systems for new energy vehicles. It also plays an irreplaceable role in fields such as industrial automation and aerospace, providing solid technical support for the long-term reliable operation of connectors under harsh working conditions.

[0003] In the field of connector sealing shell installation, traditional processes have long relied on bolt connection. However, in modern industrial production, when some equipment requires the installation of a large number of connectors, the traditional bolt installation method requires an average of 4 to 6 bolts to fix each sealing shell, which significantly increases labor and time costs. If a snap-fit ​​design is used, the connecting spring will lose elasticity and locking force after long-term use, making it prone to loosening. This leads to instability after the shell is installed, affecting its actual sealing effect. Secondly, when installing a single mounting base, different connector models and sizes are used. In order to achieve proper alignment and sealing protection, sealing shells of different sizes are used. The fixed mounting base design has low adaptability. Utility Model Content

[0004] The purpose of this utility model is to provide a connector sealing shell to solve the problems mentioned in the background art. Traditional bolt fixing methods are time-consuming and labor-intensive when dealing with large-scale installation work. If a snap-fit ​​connection is used, the spring is prone to aging and loosening, affecting the stability of the shell installation. In addition, fixed mounting bases have poor adaptability and are difficult to be compatible with multiple models of different protective shells.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a connector sealing shell, comprising a mounting base and a protective shell body, further comprising a first connector mounted on the mounting base, an adjustment component mounted on the mounting base, a connecting base mounted on the output end of the adjustment component, a push plate assembly and a pressing assembly mounted on the connecting base, a transmission assembly mounted on the connecting base, a snap-fit ​​block slidably connected to the connecting base, an external connector mounted on the protective shell body, an elastic adjustment component mounted on the connecting base, and a spring assembly detachably mounted between the elastic adjustment component and the snap-fit ​​block; The adjustment component is used to drive the connector to move in a preset direction and control the connector to move closer to or away from the protective housing body. When the connector approaches and contacts the protective housing body, the snap-fit ​​block snaps onto the protective housing body. The snap-fit ​​block is installed on the output end of the transmission assembly. The pressing assembly drives the snap-fit ​​block to move through the transmission assembly. When the connecting seat moves away from the protective housing body until the snap-fit ​​block disengages from it, the push plate assembly is used to drive the protective housing body to separate from the mounting base.

[0006] According to the preferred embodiment of this technical solution, the push plate assembly includes a third sliding plate slidably connected to the connecting seat and a third spring fixedly connected between the connecting seat and the third sliding plate.

[0007] According to the preferred embodiment of this technical solution, the pressing component includes a first sliding plate slidably connected to the connecting seat, a pressing button fixedly connected to the first sliding plate, a first spring fixedly connected between the first sliding plate and the connecting seat, and a connecting rod fixedly connected to the first sliding plate. The pressing button is used to drive the first sliding plate and the connecting rod to move in a preset direction.

[0008] In a preferred embodiment of this technical solution, the transmission component includes a fixed bracket fixedly mounted on the connecting rod, a fixed rod fixedly connected to the fixed bracket, and a linkage block fixedly connected to the snap-fit ​​block. The fixed rod is slidably connected to the linkage block, and when the connecting rod moves, it drives the fixed bracket and the fixed rod to move accordingly.

[0009] In the preferred embodiment of this technical solution, the linkage block has a matching linkage groove at the relative position of the fixed rod, and the fixed rod is slidably connected to the linkage groove. When the fixed rod moves along the linkage groove, it drives the linkage block and the locking block to move in a preset direction.

[0010] According to the preferred embodiment of this technical solution, the elastic adjustment component includes a first threaded rod rotatably connected to the connecting seat and a second sliding plate threadedly connected to the first threaded rod. A spring assembly is installed between the snap-fit ​​block and the second sliding plate. The second sliding plate is slidably connected to the connecting seat. When the first threaded rod rotates, the second sliding plate moves in a preset direction.

[0011] According to the preferred embodiment of this technical solution, the spring assembly includes a first mounting plate detachably mounted on the snap-fit ​​block, a second mounting plate detachably mounted on the second sliding plate, and a second spring fixedly connected between the first mounting plate and the second mounting plate.

[0012] According to the preferred embodiment of this technical solution, the adjustment component includes a worm gear rotatably connected to the mounting base, an adjustment knob fixedly connected to one end of the worm gear, a worm wheel meshing with the worm gear, a connecting gear fixedly installed on the worm wheel, a fixed toothed plate meshing with the connecting gear, a rotating seat fixedly installed on the fixed toothed plate, a sliding seat slidably connected to the mounting base, and a rotating rod rotatably connected at both ends to the sliding seat and the rotating seat respectively. Both the connecting gear and the rotating seat are rotatably connected to the mounting base. The connecting seat is fixedly mounted on the sliding seat. The adjusting knob is used to drive the worm to rotate. When the worm rotates, it drives the connecting gear to rotate by cooperating with the worm wheel. When the connecting gear rotates, it drives the rotating seat to rotate by cooperating with the fixed gear plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The protective shell body is quickly snapped into place using a snap-fit ​​mechanism. During disassembly, the snap-fit ​​block is moved by adjusting the pressing component and driving the transmission component to release the restriction on the protective shell body. Then, the protective shell body is pushed out by the push plate component, which allows the staff to quickly disassemble the protective shell body and greatly improves the convenience of large-scale installation and disassembly work.

[0014] 2. By adjusting the position of the connector by adjusting the components, there is no need to replace the special mounting base for connector components of different sizes. The corresponding size protective shell body can be directly selected for installation and protection, saving the disassembly and assembly steps and costs of replacing the mounting base, reducing equipment idle time, and allowing a single mounting base to quickly adapt to multiple specifications of connectors, greatly improving installation and adaptation efficiency.

[0015] 3. The elastic force of the second spring can be adjusted by the elastic force adjustment component. The required clamping force can be matched according to the protective shell body of different sizes, which improves the adaptability of the device to protective shells of different specifications. When the elastic force of the second spring decreases after long-term use, it does not need to be replaced immediately. The elastic force loss can be compensated by adjusting the elastic force adjustment component, restoring the clamping stability, reducing the frequency of spring component replacement, and reducing maintenance costs and operational complexity. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of one embodiment of a connector sealing housing according to the present invention; Figure 2 for Figure 1 Exploded view of the main mounting base and its connected components; Figure 3 for Figure 1 Schematic diagram of the middle connector and its connected components; Figure 4 This is a schematic diagram of the pressing component structure of this utility model; Figure 5 for Figure 1 Exploded view of the protective outer shell and its connected components; Figure 6 This is a schematic diagram of the adjustment component structure of this utility model.

[0017] In the diagram: 1. Mounting base; 4. First connector; 5. External connector; 21. Protective housing body; 22. Connecting seat; 23. Snap-fit ​​block; 24. Press button; 25. First sliding plate; 26. First spring; 27. Connecting rod; 28. Fixed bracket; 29. ​​Fixed rod; 210. Linkage block; 211. First threaded rod; 212. Second sliding plate; 213. First mounting piece; 214. Second mounting piece; 215. Second spring; 216. Third sliding plate; 217. Third spring; 31. Worm gear; 32. Worm wheel; 33. Connecting gear; 34. Fixed gear plate; 35. Rotating seat; 36. Sliding seat; 37. Rotating rod; 38. Adjustment knob. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 - Figure 6 This utility model provides an embodiment of a connector sealing shell, including a mounting base 1 and a protective shell body 21, and further including a first connector 4 mounted on the mounting base 1, an adjustment component mounted on the mounting base 1, a connecting base 22 mounted on the output end of the adjustment component, a push plate component and a pressing component mounted on the connecting base 22, a transmission component mounted on the connecting base 22, a snap-fit ​​block 23 slidably connected to the connecting base 22, an external connector 5 mounted on the protective shell body 21, an elastic adjustment component mounted on the connecting base 22, and a spring component detachably mounted between the elastic adjustment component and the snap-fit ​​block 23; The adjustment component is used to drive the connector 22 to move in a preset direction and control the connector 22 to move closer to or away from the protective housing body 21. When the connector 22 moves closer to and contacts the protective housing body 21, the snap-fit ​​block 23 snaps onto the protective housing body 21. The snap-fit ​​block 23 is installed on the output end of the transmission assembly. The pressing assembly drives the snap-fit ​​block 23 to move through the transmission assembly. When the connecting seat 22 moves away from the protective housing body 21 until the snap-fit ​​block 23 disengages from it, the push plate assembly is used to drive the protective housing body 21 to separate from the mounting main seat 1. During installation, the position of the connecting seat 22 is adjusted by manipulating the adjustment component according to the size of the selected protective shell body 21. During installation, the protective shell body 21 is stably assembled on the connecting seat 22 by the snap-fit ​​action of the snap-fit ​​block 23. When the protective shell body 21 is installed in place, the spring component is in a preset compression or tension state, which increases the snap-fit ​​force of the snap-fit ​​block 23 from the side, ensuring that the snap-fit ​​block 23 and the protective shell body 21 are firmly snapped together. At the same time, the external connector 5 remains in a fixed position with the protective shell body 21, forming a stable connection with the first connector 4 to realize the connection of the connector. A sealing gasket is provided at the contact point between the protective shell body 21 and the mounting main seat 1. The mounting main seat 1 is provided with a sealing ring at the wiring point of the first connector 4. The protective shell body 21 is provided with a sealing ring at the relative position of the external connector 5, so as to fully seal the inside of the protective shell body 21. Then, according to the actual situation, the elastic force transmitted by the spring component to the snap-fit ​​block 23 is adjusted by manipulating the elastic adjustment component, so that the snap-fit ​​block 23 is fully snapped with the protective shell body 21. During subsequent disassembly, by applying pressure to the pressing component, the locking block 23 is moved through the transmission component, releasing the restriction on the protective shell body 21. At this time, the push plate component can push the protective shell body 21 out a distance so that the staff can take it.

[0020] Please see Figure 3 A further solution based on this embodiment is as follows: the push plate assembly includes a third sliding plate 216 slidably connected to the connecting seat 22 and a third spring 217 fixedly connected between the connecting seat 22 and the third sliding plate 216. The push plate assembly is used to push the protective shell body 21 out after the restriction on the protective shell body 21 is released. The elastic potential energy of the third spring 217 is converted into the kinetic energy of the third sliding plate 216, which can quickly and automatically pop out the protective shell body 21 after the restriction is released, without manual operation, thus improving the convenience of operation.

[0021] Please see Figure 3 - Figure 4 A further solution based on this embodiment is as follows: the pressing component includes a first sliding plate 25 slidably connected to the connecting seat 22, a pressing button 24 fixedly connected to the first sliding plate 25, a first spring 26 fixedly connected between the first sliding plate 25 and the connecting seat 22, and a connecting rod 27 fixedly connected to the first sliding plate 25. The pressing button 24 is used to drive the first sliding plate 25 and the connecting rod 27 to move in a preset direction. The pressing action can drive the first sliding plate 25 and the connecting rod 27 to move together. The first spring 26 can automatically drive the first sliding plate 25 to reset after the pressing is completed, thus ensuring the cyclic use performance of the pressing component.

[0022] Please see Figure 3 - Figure 5A further embodiment of this solution is as follows: the transmission assembly includes a fixed bracket 28 fixedly mounted on the connecting rod 27, a fixed rod 29 fixedly connected to the fixed bracket 28, and a linkage block 210 fixedly connected to the locking block 23. The fixed rod 29 is slidably connected to the linkage block 210. When the connecting rod 27 moves, it drives the fixed bracket 28 and the fixed rod 29 to move accordingly. Through the cooperation between the fixed rod 29 and the linkage block 210, the locking block 23 is driven to move. Through the sliding cooperation between the fixed rod 29 and the linkage block 210, the locking block 23 is driven to move. The transmission structure is compact and has high transmission efficiency, which can ensure that the operating force of the pressing component is transmitted to the locking block 23 and ensure the accuracy of the movement of the locking block 23.

[0023] Please see Figure 3 , Figure 5 A further solution based on this embodiment is as follows: the linkage block 210 has a matching linkage groove at the relative position of the fixed rod 29, and the fixed rod 29 is slidably connected to the linkage groove. When the fixed rod 29 moves along the linkage groove, it drives the linkage block 210 and the locking block 23 to move in a preset direction. The linkage groove provides a sliding guide path for the fixed rod 29, which can limit the relative movement trajectory between the fixed rod 29 and the linkage block 210, avoid the two from deviating during the cooperation process, and further improve the motion stability and reliability of the transmission component.

[0024] Please see Figure 3 , Figure 5 A further solution based on this embodiment is as follows: the elasticity adjustment component includes a first threaded rod 211 rotatably connected to the connecting seat 22 and a second sliding plate 212 threadedly connected to the first threaded rod 211. The spring assembly is installed between the snap-fit ​​block 23 and the second sliding plate 212. The second sliding plate 212 is slidably connected to the connecting seat 22. When the first threaded rod 211 rotates, the second sliding plate 212 moves in a preset direction. By rotating the first threaded rod 211, the position of the second sliding plate 212 can be changed, thereby adjusting the compression or tension of the spring assembly, realizing the adjustment of the elasticity of the spring assembly. This allows the force of the snap-fit ​​block 23 to adapt to the usage requirements under different working conditions, enhancing the applicability of the device. At the same time, in response to the decrease in spring elasticity, the position of the second sliding plate 212 can be adjusted to avoid frequent replacement of the spring assembly.

[0025] Please see Figure 3 , Figure 5A further embodiment of this solution is as follows: the elastic adjustment assembly includes a first threaded rod 211 rotatably connected to the connecting seat 22 and a second sliding plate 212 threadedly connected to the first threaded rod 211. The spring assembly is installed between the snap-fit ​​block 23 and the second sliding plate 212. The second sliding plate 212 is slidably connected to the connecting seat 22. The first threaded rod 211 is used to adjust the movement of the second sliding plate 212. The first mounting plate 213 and the second mounting plate 214 provide a stable mounting base for the second spring 215, ensuring that the connection between the two ends of the second spring 215 is reliable during the extension and contraction process under force, and avoiding spring deviation. At the same time, this split installation structure facilitates the individual disassembly and replacement of the spring assembly, reducing maintenance costs.

[0026] Please see Figure 2 , Figure 6 A further solution based on this embodiment is as follows: the adjustment assembly includes a worm 31 rotatably connected to the mounting base 1, an adjustment knob 38 fixedly connected to one end of the worm 31, a worm wheel 32 meshing with the worm 31, a connecting gear 33 fixedly installed on the worm wheel 32, a fixed toothed plate 34 meshing with the connecting gear 33, a rotating seat 35 fixedly installed on the fixed toothed plate 34, a sliding seat 36 slidably connected to the mounting base 1, and a rotating rod 37 rotatably connected at both ends to the sliding seat 36 and the rotating seat 35 respectively. The connecting gear 33 and the rotating seat 35 are both rotatably connected to the mounting main seat 1. The connecting seat 22 is fixedly installed on the sliding seat 36. The adjusting knob 38 is used to drive the worm 31 to rotate. When the worm 31 rotates, it drives the connecting gear 33 to rotate by cooperating with the worm wheel 32. When the connecting gear 33 rotates, it drives the rotating seat 35 to rotate by cooperating with the fixed tooth plate 34. When the connecting gear 33 rotates, it engages with the fixed gear plate 34 to drive the rotation of the rotating seat 35. The meshing of the worm 31 and the worm wheel 32 has a self-locking characteristic, which can ensure that the adjusted position is stable and reliable and avoids changing on its own due to external forces. Through the linkage of multi-stage gears and rods, the rotational motion of the adjusting knob 38 is converted into the linear motion of the sliding seat 36, realizing the adjustment of the position of the connecting seat 22. The operation is labor-saving and the position of the connecting seat 22 can be flexibly adjusted according to actual needs.

[0027] Other embodiments: The second spring 215 in the spring assembly can be replaced with a silicone spring or a shape memory alloy spring; the advantage is that if a silicone spring is selected, it has better corrosion resistance and aging resistance, and its lifespan is longer than that of a metal spring when used in harsh environments such as humidity, acid and alkali. If a shape memory alloy spring is selected, it has a "shape memory effect" and can maintain its elasticity stably for a long time in scenarios with large temperature changes (such as outdoor equipment and high-temperature industrial environments).

[0028] Working principle: During installation, depending on the size of the selected protective housing body 21, the worm gear 31 is rotated by turning the adjustment knob 38. The worm gear 31 meshes with the worm wheel 32, which in turn drives the connecting gear 33 to rotate. The connecting gear 33 cooperates with the fixed gear plate 34 to drive the rotating seat 35 to rotate. The rotating seat 35 pushes the sliding seat 36 to move through the rotating rod 37, ultimately adjusting the position of the connecting seat 22. During installation, the protective housing body 21 is stably assembled on the connecting seat 22 by the snap-fit ​​action of the snap-fit ​​block 23. A sealing gasket is provided at the contact point between the protective housing body 21 and the mounting main seat 1. The mounting main seat 1 has a sealing ring at the wiring point of the first connector 4. The protective housing body 21 has a sealing ring at the corresponding position of the external connector 5, thus fully sealing the protective housing body 21. Inside, the third sliding plate 216 and the third spring 217 are in a preset compression or tension state, which increases the clamping force of the snap-fit ​​block 23 from the side, ensuring that the snap-fit ​​block 23 and the protective shell body 21 are firmly connected. At the same time, the external connector 5 remains in a fixed position with the protective shell body 21, forming a stable connection with the first connector 4 to realize the connection of the connector. Then, according to the actual situation, the position of the second sliding plate 212 is changed by rotating the first threaded rod 211, and the elastic force transmitted by the spring assembly to the snap-fit ​​block 23 is adjusted so that the snap-fit ​​block 23 is fully engaged with the protective shell body 21. The first mounting plate 213, the second mounting plate 214 and the second spring 215 adopt a detachable design. When the elastic force of the second spring 215 disappears and it cannot be used, the spring assembly can be disassembled and replaced. During subsequent disassembly, pressing the button 24 moves the first sliding plate 25, simultaneously pushing the connecting rod 27 to transmit force, at which point the first spring 26 is compressed. When the pressing force is released, the first spring 26 automatically releases its elastic potential energy, causing the first sliding plate 25 and the button 24 to reset, preparing for the next operation. When the first sliding plate 25 moves, it moves the connecting rod 27, and the fixed bracket 28 moves synchronously with the connecting rod 27, thereby moving the fixed rod 29. Through the cooperation of the fixed rod 29 and the linkage block 210, the locking block 23 moves, causing the locking block 23 to release its restriction on the protective shell body 21. When the locking block 23 releases its restriction on the protective shell body 21, the third spring 217 releases its pre-stored elastic potential energy, pushing the third sliding plate 216 to pop out the protective shell body 21 for the staff to pick up.

[0029] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connector sealing housing, comprising a mounting base (1) and a protective housing body (21), characterized in that: It also includes a first connector (4) mounted on the mounting base (1), an adjustment assembly mounted on the mounting base (1), a connecting seat (22) mounted on the output end of the adjustment assembly, a push plate assembly and a pressing assembly mounted on the connecting seat (22), a transmission assembly mounted on the connecting seat (22), a snap block (23) slidably connected to the connecting seat (22), an external connector (5) mounted on the protective housing body (21), a spring adjustment assembly mounted on the connecting seat (22), and a spring assembly mounted between the spring adjustment assembly and the snap block (23); The adjustment component is used to drive the connector (22) to move in a preset direction and control the connector (22) to move closer to or away from the protective shell body (21). When the connector (22) moves closer to and contacts the protective shell body (21), the snap-fit ​​block (23) snaps onto the protective shell body (21). The snap-fit ​​block (23) is installed on the output end of the transmission assembly. The pressing assembly drives the snap-fit ​​block (23) to move through the transmission assembly. When the connecting seat (22) moves away from the protective housing body (21) until the snap-fit ​​block (23) is disengaged from it, the push plate assembly is used to drive the protective housing body (21) to separate from the mounting main seat (1).

2. The connector sealing housing according to claim 1, characterized in that: The push plate assembly includes a third sliding plate (216) slidably connected to the connecting seat (22) and a third spring (217) fixedly connected between the connecting seat (22) and the third sliding plate (216).

3. The connector sealing housing according to claim 1, characterized in that: The pressing assembly includes a first sliding plate (25) slidably connected to the connecting seat (22), a pressing button (24) fixedly connected to the first sliding plate (25), a first spring (26) fixedly connected between the first sliding plate (25) and the connecting seat (22), and a connecting rod (27) fixedly connected to the first sliding plate (25). The pressing button (24) is used to drive the first sliding plate (25) and the connecting rod (27) to move in a preset direction.

4. The connector sealing housing according to claim 1, characterized in that: The transmission assembly includes a fixed bracket (28) fixedly mounted on the connecting rod (27), a fixed rod (29) fixedly connected to the fixed bracket (28), and a linkage block (210) fixedly connected to the snap block (23). The fixed rod (29) is slidably connected to the linkage block (210). When the connecting rod (27) moves, it drives the fixed bracket (28) and the fixed rod (29) to move accordingly.

5. The connector sealing housing according to claim 4, characterized in that: The linkage block (210) has a matching linkage groove at the relative position of the fixed rod (29). The fixed rod (29) is slidably connected to the linkage groove. When the fixed rod (29) moves along the linkage groove, it drives the linkage block (210) and the snap-fit ​​block (23) to move in a preset direction.

6. The connector sealing housing according to claim 1, characterized in that: The elastic adjustment assembly includes a first threaded rod (211) rotatably connected to the connecting seat (22) and a second sliding plate (212) threadedly connected to the first threaded rod (211). The spring assembly is installed between the snap block (23) and the second sliding plate (212). The second sliding plate (212) is slidably connected to the connecting seat (22). When the first threaded rod (211) rotates, the second sliding plate (212) moves in a preset direction.

7. The connector sealing housing according to claim 6, characterized in that: The spring assembly includes a first mounting plate (213) detachably mounted on the snap block (23), a second mounting plate (214) detachably mounted on the second sliding plate (212), and a second spring (215) fixedly connected between the first mounting plate (213) and the second mounting plate (214).

8. The connector sealing housing according to claim 1, characterized in that: The adjustment assembly includes a worm gear (31) rotatably connected to the mounting base (1), an adjustment knob (38) fixedly connected to one end of the worm gear (31), a worm wheel (32) meshing with the worm gear (31), a connecting gear (33) fixedly installed on the worm wheel (32), a fixed gear plate (34) meshing with the connecting gear (33), a rotating seat (35) fixedly installed on the fixed gear plate (34), a sliding seat (36) slidably connected to the mounting base (1), and a rotating rod (37) rotatably connected at both ends to the sliding seat (36) and the rotating seat (35), respectively. The connecting gear (33) and the rotating seat (35) are rotatably connected to the mounting base (1). The connecting seat (22) is fixedly mounted on the sliding seat (36). The adjusting knob (38) is used to drive the worm (31) to rotate. When the worm (31) rotates, it drives the connecting gear (33) to rotate by cooperating with the worm wheel (32). When the connecting gear (33) rotates, it drives the rotating seat (35) to rotate by cooperating with the fixed toothed plate (34).

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