A transmission mechanism

Abstract

This utility model discloses a transmission mechanism, relating to the field of contactor technology. The transmission mechanism includes: a transmission bracket; a U-shaped magnetic yoke disposed above the transmission bracket; a movable contact bridge disposed between the two ends of the U-shaped magnetic yoke; and a mounting bracket including: a bridge plate; an insertion port disposed on the top surface of the bridge plate; and a second guide portion disposed on the top surface of the bridge plate. When one end of the U-shaped magnetic yoke is inserted into the insertion port, the side of the second guide portion fits against the inner side of the end of the U-shaped magnetic yoke. The above-mentioned transmission mechanism solves the technical problem in existing transmission mechanism assembly schemes where, when the U-shaped magnetic yoke moves along with the movable contact bridge, the edge of the insertion port creates significant resistance to the U-shaped magnetic yoke due to the skewed force on the U-shaped magnetic yoke, making it difficult for the movable contact bridge to move. By limiting the end of the U-shaped magnetic yoke with the second guide portion, significant resistance is prevented from the edge of the insertion port when the U-shaped magnetic yoke moves along with the movable contact bridge, making the movement of the movable contact bridge smoother.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and in particular to a transmission mechanism. Background Technology

[0002] In the manufacturing process of electrical equipment such as contactors, a U-shaped magnetic yoke needs to be installed when the moving contact is mounted to the mounting bracket. Generally, a socket is provided on the mounting bracket to insert the U-shaped magnetic yoke. In existing technology, to facilitate the insertion of two U-shaped yokes, a larger socket is opened on the mounting bracket, allowing adjacent portions of the two U-shaped yokes to be inserted into the same socket.

[0003] However, in the above-mentioned transmission mechanism assembly scheme, when the U-shaped magnetic yoke moves along with the moving contact bridge, the U-shaped magnetic yoke is deflected by force, causing the edge of the insertion port to exert significant resistance on the U-shaped magnetic yoke, resulting in difficulty in moving the moving contact bridge. Therefore, a transmission mechanism is proposed to solve the above problem. Utility Model Content

[0004] The purpose of this utility model is to provide a transmission mechanism that solves the technical problems in the existing transmission mechanism assembly scheme, where the two U-shaped magnetic yokes interfere with each other, affecting assembly efficiency, and when the U-shaped magnetic yoke is displaced along with the moving contact bridge, the edge of the insertion port causes a large resistance to the U-shaped magnetic yoke due to the force deviation of the U-shaped magnetic yoke, making it difficult for the moving contact bridge to move.

[0005] To achieve the above objectives, this utility model provides a transmission mechanism, comprising:

[0006] A transmission bracket, wherein a U-shaped magnetic yoke is provided above the transmission bracket, and a moving contact bridge is provided between the two ends of the U-shaped magnetic yoke;

[0007] Mounting brackets, including:

[0008] A bridge plate is located above the transmission bracket. The top surface of the bridge plate is provided with an insertion port. Two first guide parts are symmetrically arranged on the inner sidewall of the insertion port. The two first guide parts divide the insertion port into two first guide ports. The two first guide ports are respectively used to pass through one end of two different U-shaped magnetic yokes.

[0009] The second guide portion is provided on the top surface of the bridge plate. After one end of the U-shaped magnetic yoke is inserted into the first guide opening, the side of the second guide portion fits against the inner side of the end of the U-shaped magnetic yoke.

[0010] Preferably, two first guide portions are symmetrically arranged on the inner sidewall of the socket, the two first guide portions dividing the socket into two first guide openings, and the two first guide openings are respectively used to pass through one end of the two different U-shaped magnetic yokes.

[0011] Preferably, the second guide portion is located at the edge of the socket, and the upper ends of both the first guide portion and the second guide portion are bent at a certain angle away from the outside of the socket.

[0012] Preferably, an assembly side opening is provided on each side of the bridge plate, the upper end of the assembly side opening extends horizontally, the assembly side opening is used to pass through one end of the U-shaped magnetic yoke, and an elastic element is provided on the bottom surface of the U-shaped magnetic yoke, the bottom surface of the elastic element abuts against the top surface of the transmission bracket.

[0013] Preferably, a support leg is provided on each side of the bridge plate, and the two support legs are snapped together to connect the transmission bracket. The outer end face of the U-shaped magnetic yoke protrudes from the outer side of the support leg, and an movable gap is reserved between the bottom surface of the U-shaped magnetic yoke and the bottom surface of the assembly side opening.

[0014] Preferably, the upper ends of the first guide portion and the second guide portion are both bent at a certain angle away from the outside of the socket.

[0015] Preferably, the transmission bracket has snap-fit ​​protrusions on both sides, and the lower end of the support leg has a positioning hole, which snaps into the snap-fit ​​protrusions.

[0016] Preferably, the end of the support leg is provided with a folded edge.

[0017] Preferably, the top surface of the transmission bracket is provided with a plurality of limiting posts, and when the positioning hole is engaged with the engaging protrusion, the side of the limiting post abuts against the outer side of the support leg.

[0018] Preferably, the top surface of the transmission bracket is provided with a plurality of slots, and the side of the support leg is provided with a limiting step. When the positioning hole is engaged with the engaging protrusion, the limiting step is inserted into the slot.

[0019] Preferably, a limiting groove is provided on the side of the moving contact bridge, and the side of the limiting groove is slidably connected to the side of the support leg.

[0020] Compared with the above-mentioned background technology, the transmission mechanism provided by this utility model has the following beneficial effects: a second guide part is provided on the top surface of the bridge plate. After one end of the U-shaped magnetic yoke is inserted into the socket, the side of the second guide part is in contact with the inner side of the end of the U-shaped magnetic yoke. The end of the U-shaped magnetic yoke is limited by the second guide part. When the U-shaped magnetic yoke moves with the moving contact bridge, the edge of the socket is prevented from causing greater resistance to the U-shaped magnetic yoke, so that the movement of the moving contact bridge is smoother. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional structural diagram of the transmission mechanism provided in an embodiment of this utility model;

[0023] Figure 2 This is a plan view of the transmission mechanism provided in an embodiment of the present utility model;

[0024] Figure 3 This is an assembly diagram of the mounting bracket and U-shaped magnetic yoke provided in an embodiment of the present utility model;

[0025] Figure 4 A perspective view of the mounting bracket provided in an embodiment of this utility model;

[0026] Figure 5 This is a plan view of the mounting bracket provided in an embodiment of the present utility model;

[0027] Figure 6 A perspective view of the mounting bracket provided in the second embodiment of this utility model;

[0028] Figure 7 This is a top view of the mounting bracket provided in the second embodiment of the present utility model;

[0029] Figure 8 This is a plan view of the mounting bracket provided in the third embodiment of the present utility model;

[0030] Figure 9 A perspective view of the mounting bracket provided in the fourth embodiment of this utility model;

[0031] Figure 10 This is a top view of the mounting bracket provided in the fifth embodiment of the present utility model;

[0032] Figure 11 This is a plan view of the mounting bracket provided in the sixth embodiment of the present utility model;

[0033] Figure 12 This is a three-dimensional structural diagram of the mounting bracket provided in the seventh embodiment of this utility model.

[0034] Specifically, 1-Transmission bracket; 101-Limiting post; 102-Slot; 103-Snap-fit ​​protrusion; 1031-Step; 2-U-shaped magnetic yoke; 3-Moving contact bridge; 301-Moving contact; 302-Limiting groove; 4-Elastic element; 5-Mounting bracket; 501-Bridge plate; 5011-First guide part; 5012-First guide opening; 5013-Second guide part; 5014-Matching groove; 502-Feet; 5021-Positioning hole; 5022-Folded edge; 5023-Limiting step; 503-Assembly side opening; 504-Movement clearance. Detailed Implementation

[0035] 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.

[0036] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, in order to achieve the above objectives, this utility model provides a transmission mechanism, including: a transmission bracket 1, a U-shaped magnetic yoke 2, and a mounting bracket 5. Preferably, the mounting bracket 5 is made of metal to ensure the structural strength of the mounting bracket 5. The U-shaped magnetic yoke 2 is disposed above the transmission bracket 1, with the opening of the U-shaped magnetic yoke 2 facing upward, and a moving contact bridge 3 is disposed between the two ends of the U-shaped magnetic yoke 2.

[0038] The mounting bracket 5 includes a bridge plate 501 and support legs 502 disposed on both sides of the bridge plate 501. The bridge plate 501 and the support legs 502 are integrally formed. The bridge plate 501 is located above the transmission bracket 1. A rectangular insertion port is provided on the top surface of the bridge plate 501. A second guide portion 5013 is provided on the top surface of the bridge plate 501. When one end of the U-shaped magnetic yoke 2 is inserted into the insertion port, the side of the second guide portion 5013 fits against the inner side of the end of the U-shaped magnetic yoke 2. The second guide portion 5013 limits the end of the U-shaped magnetic yoke 2. When the U-shaped magnetic yoke 2 moves with the moving contact bridge 3, it prevents the edge of the insertion port from causing excessive resistance to the U-shaped magnetic yoke 2, making the movement of the moving contact bridge 3 smoother.

[0039] Optionally, the ends of two different U-shaped magnetic yokes 2 in the same socket are spaced a certain distance apart to ensure that the two U-shaped magnetic yokes 2 move independently and do not interfere with each other, thereby making the movement of the moving contact bridge 3 smoother.

[0040] During assembly, the movable contact bridge 3 is installed between the two ends of the U-shaped magnetic yoke 2. One end of the U-shaped magnetic yoke 2 is inserted into the socket. The side of the second guide part 5013 is in contact with the inner side of the end of the U-shaped magnetic yoke 2 to provide a certain limiting effect on the U-shaped magnetic yoke 2, so that the end of the U-shaped magnetic yoke 2 maintains a stable structural shape and prevents the end of the U-shaped magnetic yoke 2 from being skewed and abutting against the edge of the socket, so that the U-shaped magnetic yoke 2 moves more smoothly with the movable contact bridge 3.

[0041] In some embodiments of this utility model, two first guide portions 5011 are symmetrically arranged on the inner sidewall of the socket. The first guide portions 5011 are integrally formed with the bridge plate 501. The first guide portions 5011 are columnar. The two first guide portions 5011 divide the socket into two first guide openings 5012. The two first guide openings 5012 are respectively used to pass through one end of two different U-shaped magnetic yokes 2. That is, the two ends of the two different U-shaped magnetic yokes 2 are separated by the two first guide portions 5011, so that the two U-shaped magnetic yokes 2 will not interfere with each other on the mounting bracket 5, thereby facilitating the assembly of the U-shaped magnetic yokes 2. At the same time, the first guide portions 5011 can cooperate with the second guide portions 5013 to limit the ends of the U-shaped magnetic yokes 2, so that the two U-shaped magnetic yokes 2 can move independently without interfering with each other, further making the movement of the moving contact bridge 3 smoother.

[0042] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, the second guide portion 5013 is disposed at the edge of the insertion port. The upper end of the first guide portion 5011 and the upper end of the second guide portion 5013 are both bent at a certain angle away from the outside of the insertion port. The bottom arc formed by the bending can facilitate the insertion of the U-shaped magnetic yoke 2, thereby improving the assembly efficiency of the transmission mechanism.

[0043] Alternatively, the first guide section 5011 can be horizontally extended on the bridge plate 501, such as... Figure 6 and Figure 7 As shown, in the second embodiment of this utility model, the first guide protrusion is flush with the top surface of the bridge plate 501, and only the upper end of the second guide portion 5013 is bent at a certain angle away from the outside of the insertion port. This can also facilitate the insertion of the U-shaped magnetic yoke 2, improve the assembly efficiency of the transmission mechanism, and at the same time reduce the production process of the mounting bracket 5 and reduce production costs.

[0044] In some embodiments of this utility model, a mounting side opening 503 is provided on each side of the bridge plate 501. The mounting side opening 503 is vertically arranged, and its upper end extends horizontally, allowing the end foot of the U-shaped magnetic yoke 2 to pass through it. Additionally, an elastic element 4 is provided on the bottom surface of the U-shaped magnetic yoke 2. The elastic element 4 can be a spring or an elastic steel sheet. The bottom surface of the elastic element 4 abuts against the top surface of the transmission bracket 1, and the elastic element 4 elastically supports the U-shaped magnetic yoke 2, enabling the U-shaped magnetic yoke 2 to reciprocate up and down relative to the transmission bracket 1.

[0045] In addition, a support leg 502 is provided on each side of the bridge plate 501. The support leg 502 is integrally formed with the bridge plate 501. After the movable contact bridge 3 is installed between the two ends of the U-shaped magnetic yoke 2, one end of the U-shaped magnetic yoke 2 is inserted into the first guide opening 5012, and the other end of the U-shaped magnetic yoke 2 is inserted into the assembly side opening 503. The two support legs 502 are engaged with the transmission bracket 1 to fix the mounting bracket 5 on the transmission bracket 1 and lock the position of the bridge plate 501 relative to the transmission bracket 1. Under the support of the elastic member 4, the U-shaped magnetic yoke 2 and the bridge plate 501 cooperate to clamp the movable contact bridge 3.

[0046] It should be noted that the outer end face of the U-shaped magnetic yoke 2 protrudes beyond the outer side of the support leg 502, and a movable gap 504 is reserved between the bottom surface of the U-shaped magnetic yoke 2 and the bottom surface of the mounting side opening 503. Specifically, after the transmission mechanism is assembled, when the top surface of the moving contact bridge 3 is pressed against the bottom surface of the bridge plate 501, a movable gap 504 is still left between the mounting side opening 503 and the bottom surface of the U-shaped magnetic yoke 2, thereby ensuring that the mounting side opening 503 can accommodate the movement of the U-shaped magnetic yoke 2 within it, so as to meet the displacement requirements of the moving contact bridge 3.

[0047] In some embodiments of this utility model, snap-fit ​​protrusions 103 are provided on both sides of the transmission bracket 1, and positioning holes 5021 are provided at the lower end of the support leg 502. The positioning holes 5021 snap-fit ​​the snap-fit ​​protrusions 103. By snap-fitting the positioning holes 5021 with the snap-fit ​​protrusions 103, the mounting bracket 5 can be stably connected to the transmission bracket 1, and the mounting bracket 5 and the transmission bracket 1 can be easily disassembled and assembled.

[0048] like Figure 1As shown, optionally, the side of the snap-fit ​​protrusion 103 is set as a slope, and the lower part of the snap-fit ​​protrusion 103 forms a stepped step 1031 with the side of the transmission bracket 1. During the process of assembling the mounting bracket 5 onto the transmission bracket 1, as the bridge plate 501 gradually approaches the top surface of the transmission bracket 1, the lower end of the support leg 502 is gradually opened by the snap-fit ​​protrusion 103 at a certain angle until the snap-fit ​​protrusion 103 enters the positioning hole 5021, and the support leg 502 returns to its initial structural state. At this time, the bottom surface of the stepped step 1031 abuts against the side of the positioning hole 5021 to form a locking effect on the support leg 502, thereby improving the stability of the connection between the mounting bracket 5 and the transmission bracket 1.

[0049] like Figure 8 As shown, in the third embodiment of this utility model, a folded edge 5022 is provided at the end of the support leg 502. The folded edges 5022 at the ends of the two support legs 502 extend in a direction away from each other to ensure that the positioning hole 5021 on the support leg 502 can more easily engage with the engagement protrusion 103.

[0050] In some embodiments of this utility model, a plurality of limiting posts 101 are provided on the top surface of the transmission bracket 1. The limiting posts 101 are perpendicular to the top surface of the transmission bracket 1. When the positioning hole 5021 engages with the connecting protrusion 103, the side of the limiting post 101 abuts against the outer side of the support leg 502 to limit the overall installation bracket 5, thereby further improving the stability of the connection between the installation bracket 5 and the transmission bracket 1. In addition, a plurality of slots 102 are provided on the top surface of the transmission bracket 1, and a limiting step 5023 is provided on the side of the support leg 502. When the positioning hole 5021 engages with the connecting protrusion 103, the limiting step 5023 is inserted into the connecting slot 102, further limiting the overall installation bracket 5 and improving the stability of the connection between the installation bracket 5 and the transmission bracket 1.

[0051] In some embodiments of this utility model, a mating groove 5014 is provided on the circumferential side of the bridge plate 501. The mating groove 5014 is arc-shaped. After the movable contact bridge 3 is installed on the U-shaped magnetic yoke 2 and the U-shaped magnetic yoke 2 is installed on the mounting bracket 5, the mating groove 5014 can reserve a certain amount of space for the two movable contacts 301 at both ends of the movable contact bridge 3, ensuring that the movable contact bridge 3 can smoothly move up and down with the U-shaped magnetic yoke 2.

[0052] It should be noted that a limiting groove 302 is provided on the side of the moving contact bridge 3. The side of the limiting groove 302 is slidably connected to the side of the support leg 502. During the reciprocating motion of the moving contact bridge 3 with the U-shaped magnetic yoke 2, the movement path of the moving contact bridge 3 can be limited and corrected by the sliding cooperation between the limiting groove 302 and the side of the support leg 502, so as to ensure the movement accuracy of the moving contact bridge 3 and make the movement of the moving contact bridge 3 smoother.

[0053] like Figure 9As shown, in the fourth embodiment of this utility model, the top surface of the bridge plate 501 is provided with two sockets. The sockets are divided into two first guide ports 5012 by two first guide parts 5011. Multiple sockets ensure that the mounting bracket 5 can be equipped with more U-shaped magnetic yokes 2 according to actual needs, that is, the mounting bracket 5 can cooperate with multiple moving contact bridges 3 according to actual needs. It should be noted that the two first guide ports 5012 in the same socket are respectively provided with the end feet of different U-shaped magnetic yokes 2. Except for the difference in the number of sockets, the other structural features of the mounting bracket 5 are the same as those of the bridge plate 501 having one socket on the top surface, so they will not be described in detail.

[0054] like Figure 10 As shown, in the fifth embodiment of this utility model, a second guide portion 5013 is provided at the upper edge of the assembly side opening 503 and at the edge of the insertion port, respectively. The two second guide portions 5013 are parallel to each other. The second guide portion 5013 located at the edge of the insertion port cooperates with the first guide portion 5011 to limit one end of the U-shaped magnetic yoke 2. The second guide portion 5013 located at the upper edge of the assembly side opening 503 limits the other end of the U-shaped magnetic yoke 2, further preventing one end of the U-shaped magnetic yoke 2 from being skewed and abutting against the edge of the insertion port, so that the U-shaped magnetic yoke 2 moves more smoothly with the movement of the moving contact bridge 3.

[0055] like Figure 11 As shown, in the sixth embodiment of this utility model, a second guide portion 5013 is provided at the upper edge of the assembly side opening 503, while the second guide portion 5013 is no longer provided at the edge of the insertion opening. In this case, the first guide portion 5011 limits one end of the U-shaped magnetic yoke 2, and the second guide portion 5013 limits the other end of the U-shaped magnetic yoke 2. This can also prevent one end of the U-shaped magnetic yoke 2 from being skewed and abutting against the edge of the insertion opening, making the U-shaped magnetic yoke 2 move more smoothly when it moves with the moving contact bridge 3.

[0056] like Figure 12 As shown, in the seventh embodiment of this utility model, two insertion ports are provided on the top surface of the bridge plate 501, and second guide portions 5013 are respectively provided at the upper edge of the assembly side opening 503 and the edge of the insertion port. The two second guide portions 5013 are parallel to each other. The second guide portion 5013 located at the edge of the insertion port cooperates with the first guide portion 5011 to limit one end of the U-shaped magnetic yoke 2, and the second guide portion 5013 located at the upper edge of the assembly side opening 503 limits the other end of the U-shaped magnetic yoke 2.

[0057] During assembly, the movable contact bridge 3 is installed between the two ends of the U-shaped magnetic yoke 2. One end of the U-shaped magnetic yoke 2 passes through the first guide opening 5012. Two first guide parts 5011 separate the two ends of the two different U-shaped magnetic yokes 2. The side of the first guide part 5011 is in contact with the outer side of the end of the U-shaped magnetic yoke 2. The other end of the U-shaped magnetic yoke 2 passes through the assembly side opening 503. The side of the second guide part 5013 is in contact with the inner side of the end of the U-shaped magnetic yoke 2. Then, the two support legs 502 are respectively snapped onto both sides of the transmission bracket 1. The two support legs 502 on the mounting bracket 5 are snapped onto the transmission bracket 1 to fix the mounting bracket 5 as a whole onto the transmission bracket 1, locking the position of the bridge plate 501 relative to the transmission bracket 1. At this time, the elastic member 4 presses against the bottom surface of the U-shaped magnetic yoke 2, so that the U-shaped magnetic yoke 2 and the bridge plate 501 cooperate to clamp the movable contact bridge 3, completing the assembly of the transmission mechanism.

[0058] In summary, by using the first guide part 5011 and the second guide part 5013 to limit the end feet of the U-shaped magnetic yoke 2, the two U-shaped magnetic yokes 2 will not interfere with each other on the mounting bracket 5. When the U-shaped magnetic yoke 2 moves along with the moving contact bridge 3, the two U-shaped magnetic yokes 2 move independently without interfering with each other, making the movement of the moving contact bridge 3 smoother.

[0059] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0060] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A transmission mechanism, characterized by, include: A transmission bracket, wherein a U-shaped magnetic yoke is provided above the transmission bracket, and a moving contact bridge is provided between the two ends of the U-shaped magnetic yoke; Mounting brackets, including: A bridge plate is located above the transmission bracket, and an insertion port is provided on the top surface of the bridge plate; The second guide portion is provided on the top surface of the bridge plate. After one end of the U-shaped magnetic yoke is inserted into the socket, the side of the second guide portion fits against the inner side of the end of the U-shaped magnetic yoke.

2. A transmission mechanism according to claim 1, wherein Two first guide portions are symmetrically arranged on the inner sidewall of the socket, and the two first guide portions divide the socket into two first guide openings. The two first guide openings are respectively used to pass through one end of the two different U-shaped magnetic yokes.

3. A transmission mechanism according to claim 2, wherein The second guide portion is located at the edge of the socket, and the upper ends of both the first guide portion and the second guide portion are bent at a certain angle away from the outside of the socket.

4. A transmission mechanism according to claim 1, wherein The bridge plate has an assembly side opening on each side. The upper end of the assembly side opening extends horizontally. The assembly side opening is used to pass through one end of the U-shaped magnetic yoke. The bottom surface of the U-shaped magnetic yoke is provided with an elastic element, and the bottom surface of the elastic element abuts against the top surface of the transmission bracket.

5. A transmission mechanism according to claim 4, wherein A support leg is provided on each side of the bridge plate, and the two support legs are snapped together to connect the transmission bracket. The outer end face of the U-shaped magnetic yoke protrudes from the outer side of the support leg, and an movable gap is reserved between the bottom surface of the U-shaped magnetic yoke and the bottom surface of the assembly side opening.

6. A transmission mechanism according to claim 5, wherein The transmission bracket has snap-fit ​​protrusions on both sides, and the lower end of the support leg has a positioning hole, which snaps into the snap-fit ​​protrusions.

7. A transmission mechanism according to claim 6, wherein The ends of the support legs are provided with folded edges.

8. A transmission mechanism according to claim 6, wherein The top surface of the transmission bracket is provided with several limiting posts. When the positioning hole is engaged with the locking protrusion, the side of the limiting post abuts against the outer side of the support leg.

9. A transmission mechanism according to claim 8, wherein The top surface of the transmission bracket is provided with several slots, and the side of the support leg is provided with a limiting step. When the positioning hole is engaged with the engaging protrusion, the limiting step is inserted into the slot.

10. A transmission mechanism according to claim 4, wherein The moving contact bridge has a limiting groove on its side, and the side of the limiting groove is slidably connected to the side of the support leg.

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