Contact device

Abstract

The utility model provides a contact device, and relates to the technical field of low-voltage electric appliances. The contact device comprises a moving contact assembly and a connecting seat. The moving contact assembly comprises two contact bridges, and the lower end surfaces of the two contact bridges are provided with first clearance fit parts. The connecting seat comprises a connecting main body and a limiting assembly, the limiting assembly is arranged on the connecting main body and matched with the connecting main body to form two mounting areas which are distributed at intervals in the Y direction, and the two contact bridges are connected to the two mounting areas in a limiting mode in a one-to-one correspondence mode; second clearance fit parts in clearance fit with the corresponding first clearance fit parts are arranged on the bottom wall of the mounting area; and one of the first clearance fit part and the second clearance fit part is a convex rail, and the other one is a groove. The contact device provided by the utility model can reduce the difficulty of height difference adjustment of the two ends of the contact bridge and ensure the effect of height difference adjustment.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contact device. Background Technology

[0002] With the continuous advancement of the low-voltage electrical appliance industry, relays, contactors, and other switching devices are widely used in many fields such as industrial control, building electrical systems, and household appliances. Contact devices, as key components of these switching devices, play a crucial role in the performance and reliability of the equipment. Among them, bridge contacts are widely used in various switching devices due to their excellent conductivity and contact stability.

[0003] In actual production, bridge-type contacts are affected by factors such as machining accuracy, assembly errors, and material deformation; and during installation, they are affected by factors such as the hole accuracy of the connecting seat and the fit tolerance between the contact bridge and the connecting seat. This can lead to inconsistent heights at both ends of the contact bridge. Existing bridge-type contact structures lack an effective balancing adjustment mechanism. If inconsistent heights occur at both ends after installation, adjusting the height difference can easily result in an excessively small adjustment gap, leading to a small or nonexistent error compensation range. This makes height difference adjustment difficult and ineffective. Utility Model Content

[0004] The purpose of this invention is to provide a contact device that can reduce the difficulty of adjusting the height difference between the two ends of the contact bridge and ensure the effectiveness of the height difference adjustment.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Contact device, including;

[0007] The moving contact assembly includes two contact bridges, and a first clearance fit portion is provided on the lower end surface of each of the two contact bridges;

[0008] The connector includes a connecting body and a limiting component. The limiting component is disposed on the connecting body and cooperates with the connecting body to form two installation areas spaced apart along the Y direction. The two contact bridges are correspondingly limited and connected to the two installation areas. The bottom wall of the installation area is provided with a second clearance fit part that is clearance fit with the corresponding first clearance fit part.

[0009] Of the first clearance fit portion and the second clearance fit portion, one is configured as a convex rail and the other is configured as a groove.

[0010] As a further technical solution, the cross-sectional shape of the groove along the Y direction is arc-shaped, and the side wall of the convex rail near the groove is correspondingly set as an arc-shaped surface.

[0011] As a further technical solution, the line connecting the center of the convex rail and the center of the groove is perpendicular to the upper surface of the connecting body.

[0012] As a further technical solution, along the X direction, the two ends of the contact bridge are symmetrically arranged about the line connecting the center of the convex rail and the center of the groove.

[0013] As a further technical solution, the second gap fitting part is configured as a convex rail, and the first gap fitting part is configured as a groove, with the two sides of the groove smoothly transitioning to the corresponding contact bridge.

[0014] As a further technical solution, along the Y direction, the first gap fitting portion passes through the corresponding contact bridge, and the length of the second gap fitting portion is equal to the length of the first gap fitting portion.

[0015] As a further technical solution, the limiting component includes two first limiting members and two limiting groups. Along the Y direction, the two first limiting members are both disposed in the middle of the connecting body, and the two first limiting members are disposed at a distance from each other along the X direction. The first limiting portions on the two first limiting members are parallel to the upper end surface of the connecting body, and the first side limit of the contact bridge is located between the two first limiting portions and the upper end of the connecting body.

[0016] Along the Y direction, the two limiting groups are respectively disposed on both sides of the two first limiting members, and the second side of the contact bridge abuts against the corresponding limiting group;

[0017] The side of the convex rail closest to the first limiting member is configured as a clearance surface.

[0018] As a further technical solution, the direction from the first limiting member to the limiting group is inclined in the direction opposite to the upper surface of the connecting body, corresponding to the avoidance surface.

[0019] As a further technical solution, 0.3mm≥L≥-0.2mm, where L is the distance between the inclined starting point of the avoidance surface near the side corresponding to the limiting group and the side wall of the first limiting member near the side corresponding to the limiting group.

[0020] As a further technical solution, along the X direction, adjustment slopes are provided on both sides of each of the second gap fitting parts, and the two adjustment slopes on the same side are correspondingly provided on the upper end surface of the connecting body with the two first limiting members, and a gap is provided between each adjustment slope and the corresponding contact bridge.

[0021] Beneficial effects:

[0022] Since both contact bridges have a first clearance fit portion on their lower end faces, and the bottom walls of the two mounting areas have a second clearance fit portion that mates with the corresponding first clearance fit portion, one of the first and second clearance fit portions is a convex rail, and the other is a groove. After the contact bridge is positioned in the corresponding mounting area, when a height difference occurs between the two ends of the contact bridge due to manufacturing, the first and second clearance fit portions are used to compensate for the height difference error, thus avoiding the situation where the gap between the contact bridge and the connecting body is too small to achieve error adjustment, thereby reducing the difficulty of adjusting the height difference between the two ends of the contact bridge. Furthermore, during the height difference adjustment process, pressing the relatively higher end of the contact bridge causes the groove to rotate around the convex rail, causing the contact bridge to swing relative to the connecting body, thereby completing the compensation for the height difference between the two ends of the contact bridge. The convex rail and groove fit together can increase the swing amplitude of the contact bridge, thereby increasing the range of error compensation, further reducing the difficulty of adjusting the height difference between the two ends of the contact bridge, while ensuring the height difference adjustment effect. Attached Figure Description

[0023] Figure 1 This is a front view of the contact device provided in an embodiment of the present utility model;

[0024] Figure 2 This is a partial structural schematic diagram of the contact device provided in this embodiment of the utility model;

[0025] Figure 3 This is a partial top view of the contact device provided in this embodiment of the utility model;

[0026] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0027] Figure 5 This is a schematic diagram of the connecting seat in the contact device provided in this embodiment of the utility model;

[0028] Figure 6 This is a bottom view of the connecting seat in the contact device provided in this embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of the contact bridge structure in the contact device provided in this embodiment of the utility model;

[0030] Figure 8 This is a front view of another embodiment of the contact device provided in this utility model.

[0031] In the picture:

[0032] 100. Moving contact assembly; 110. Contact bridge; 111. First clearance fit part; 112. Limiting groove; 113. Limiting protrusion; 120. Contact point;

[0033] 200. Connecting seat; 210. Connecting body; 211. Second clearance fit part; 2110. Clearance surface; 212. Adjustment slope; 220. Limiting component; 221. First limiting member; 2211. First limiting part; 2212. Second limiting part; 2213. Separator; 222. Second limiting member;

[0034] 310. Positioning frustum; 320. Limiting joist. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Combination Figures 1 to 8As shown, the contact device provided in this embodiment can reduce the difficulty of adjusting the height difference between the two ends of the contact bridge 110 and ensure the effect of the height difference adjustment. Specifically, the contact device includes a moving contact assembly 100 and a connecting seat 200. The moving contact assembly 100 includes two contact bridges 110, and a first clearance fit portion 111 is provided on the lower end surface of each of the two contact bridges 110. The connecting seat 200 includes a connecting body 210 and a limiting component 220. The limiting component 220 is disposed on the connecting body 210 and cooperates with the connecting body 210 to form two installation areas spaced apart along the Y direction. The two contact bridges 110 are correspondingly limited and connected to the two installation areas, and the bottom wall of the installation area is provided with a second clearance fit portion 211 that gap fits with the corresponding first clearance fit portion 111. Of the first clearance fit portion 111 and the second clearance fit portion 211, one is set as a convex rail and the other is set as a groove.

[0040] Since the lower end surfaces of the two contact bridges 110 are provided with a first clearance fitting part 111, the bottom walls of the two installation areas are provided with a second clearance fitting part 211 that mates with the corresponding first clearance fitting part 111, and one of the first clearance fitting part 111 and the second clearance fitting part 211 is provided as a convex rail and the other is provided as a groove. After the contact bridge 110 is positioned in the corresponding installation area, when a height difference occurs between the two ends of the contact bridge 110 due to manufacturing processes, the first clearance fitting part 111 and the second clearance fitting part 211 are used to fit together to compensate for the error of the height difference between the two ends of the contact bridge 110. This avoids the situation where the error cannot be adjusted due to the small gap between the contact bridge 110 and the connecting body, thereby reducing the difficulty of adjusting the height difference between the two ends of the contact bridge 110. During the height difference adjustment process, pressing the relatively higher end of the contact bridge 110 causes the groove to rotate around the convex rail, causing the contact bridge 110 to swing relative to the connecting body, thereby completing the compensation for the height difference between the two ends of the contact bridge 110. Furthermore, the engagement of the convex rail and the groove can increase the swing amplitude of the contact bridge 110, thereby increasing the range of error compensation and further reducing the difficulty of adjusting the height difference between the two ends of the contact bridge 110 while ensuring the height difference adjustment effect.

[0041] like Figure 1 As shown, in this embodiment, the second gap fitting part 211 is set as a convex rail, and the first gap fitting part 111 is set as a groove. The two sides of the groove are smoothly connected to the corresponding contact bridge 110 to avoid the situation where the two sides of the contact bridge 110 are connected to the groove at an angle. This improves the overall structural strength of the contact bridge 110 and prevents the relatively high end of the contact bridge 110 from bending with the groove when the relatively high end of the contact bridge 110 is pressed during the height difference adjustment process.

[0042] like Figure 8As shown, in some other embodiments, the second clearance fit portion 211 is configured as a groove, and the first clearance fit portion 111 is configured as a convex rail.

[0043] To further improve the ease of height adjustment at both ends of the contact bridge 110, the groove has an arc-shaped cross-section along the Y direction, and the side wall of the convex rail near the groove is correspondingly arc-shaped to further enhance the ease of rotation of the groove around the convex rail. Simultaneously, because the groove has an arc-shaped cross-section along the Y direction, it avoids the formation of angles that could reduce the groove's strength, thus preventing the groove from bending when pressing the end of the contact bridge 110 that is relatively high.

[0044] Furthermore, in this embodiment, the cross-sectional shape of the convex rail along the Y direction is semi-circular, and the circle of the convex rail is located on the upper end surface of the connecting body; at the same time, the radius of the groove is larger than the radius of the convex rail, and the line connecting the center of the convex rail and the center of the groove is perpendicular to the upper end surface of the connecting body 210. This avoids misalignment between the convex rail and the groove, thereby further improving the convenience of pressing one end of the contact bridge 110 to make the contact bridge 110 swing.

[0045] In other embodiments, the cross-sectional shape of the convex rail along the Y direction can be set to a circle, an ellipse, a semi-ellipse, etc., and is not limited to the semi-circle in this embodiment.

[0046] In order to ensure the balance of both sides of the contact bridge 110 and avoid the height difference between the two ends of the contact bridge 110 due to the uneven weight, in this embodiment, the two ends of the contact bridge 110 are symmetrically arranged along the X direction with respect to the line connecting the center of the convex rail and the center of the groove.

[0047] Preferably, along the Y-direction, the first clearance fitting portion 111 penetrates the corresponding contact bridge 110, and the length of the second clearance fitting portion 211 is equal to the length of the first clearance fitting portion 111. That is, the groove penetrates the corresponding contact bridge 110, and the length of the convex rail is consistent with the length of the corresponding groove. With this arrangement, when one end of the contact bridge 110 is pressed, the movement of the contact bridge 110 on both sides along the Y-direction can be ensured to further guarantee the height difference adjustment effect.

[0048] In some other embodiments, the first gap fitting portion 111 may not penetrate the corresponding contact bridge 110, and is not limited to this embodiment.

[0049] Preferably, the limiting component 220 includes two first limiting members 221 and two limiting groups. Along the Y direction, the two first limiting members 221 are both disposed in the middle of the connecting body 210, and the two first limiting members 221 are disposed at a distance from each other along the X direction. The first limiting portions 2211 on the two first limiting members 221 are parallel to the upper end surface of the connecting body 210, and the first side of the contact bridge 110 is limited between the two first limiting portions 2211 and the upper end of the connecting body 210. Along the Y direction, the two limiting groups are respectively disposed on both sides of the two first limiting members 221, and the second side of the contact bridge 110 abuts against the corresponding limiting group.

[0050] Taking one of the first limiting components 221 as an example, its structure will be explained in detail, specifically in conjunction with... Figure 2 and Figure 5 As shown, in this embodiment, the first limiting member 221 includes a first limiting portion 2211, a second limiting portion 2212, and a partition portion 2113, all of which are plate-shaped. The first end of the second limiting portion 2212 is connected to the upper end surface of the connecting body 210, and the second end of the second limiting portion 2212 extends away from the connecting body 210 and is perpendicular to the connecting body 210. The first end of the first limiting portion 2211 is fixedly connected to the second end of the second limiting portion 2212, and the second end of the first limiting portion 2211 extends towards the middle of the connecting body 210 and is parallel to the upper end surface of the connecting body 210. The partition portion 2113 is connected to the side of the first limiting portion 2211 near the connecting body 210 and is perpendicular to the first limiting portion 2211, the second limiting portion 2212, and the upper end surface of the connecting body 210.

[0051] Since the two first limiting members 221 are disposed in the middle of the connecting body 210 and the two first limiting members 221 are disposed at intervals relative to each other along the X direction, by providing the dividing part 2113, the area enclosed by the corresponding first limiting part 2211, second limiting part 2212 and the upper end surface of the connecting body 210 is divided into two areas along the Y direction, so that the two sides of the dividing part 2113 cooperate with the corresponding limiting group to form two installation areas respectively.

[0052] Each limiting group includes multiple second limiting members 222 spaced apart along the X direction. Two limiting grooves 112 are provided on one side of the contact bridge 110, and two limiting protrusions 113 are provided on the other side of the contact bridge 110. The two limiting protrusions 113 cooperate with the contact bridge 110 to form positioning grooves. When the contact bridge 110 is installed in the corresponding installation area, the two limiting grooves 112 are correspondingly and locked into the two second limiting portions 2212. All the multiple second limiting members 222 abut against the other side of the contact bridge 110, and all the multiple second limiting members 222 are located within their corresponding positioning grooves. In this embodiment, each limiting group includes two second limiting members 222 spaced apart along the X direction. In other embodiments, the number of second limiting members 222 in each limiting group is not limited to two.

[0053] Both ends of the contact bridge 110 are provided with contacts 120 to realize the connection and disconnection between the contact device and the circuit.

[0054] By setting a partition plate and a second limiting member 222, the two contact bridges 110 are separated in the Y direction to avoid interference between them. By the second limiting member 222 cooperating with the corresponding limiting groove 112, and by multiple second limiting members 222 cooperating with the corresponding positioning groove, the relative positions of the contact bridges 110 are restricted in the X and Y directions, and the contact bridges 110 are confined within the corresponding installation area to improve the installation strength and stability of the contact bridges 110.

[0055] When installing the contact bridge 110 in the corresponding installation area, to avoid interference between the side of the contact bridge 110 near the first limiting member 221 and the first limiting part 2211, which could cause damage or deformation to the contact bridge 110, in this embodiment, the side of the convex rail near the first limiting member 221 is set as a clearance surface 2110. Specifically, from the first limiting member 221 to the limiting group, the clearance surface 2110 is inclined in a direction away from the upper end surface of the connecting body 210 to form an inclined clearance surface 2110. During the installation of the contact bridge 110, while the inclined clearance surface 2110 avoids the side of the contact bridge 110 near the first limiting member 221, it also guides the contact bridge 110, causing the side of the contact bridge 110 near the first limiting member 221 to slide down along the inclined clearance surface 2110. Then, the side of the contact bridge 110 with the limiting protrusion 113 is pressed until the contact bridge 110 is parallel to the upper end surface of the connecting body, thus completing the installation of the contact bridge 110.

[0056] In some other embodiments, the avoidance surface 2110 may be configured as an arc-shaped avoidance surface 2110.

[0057] As a further technical solution, 0.3mm≥L≥-0.2mm, where L is the distance between the inclined starting point of the avoidance surface 2110 near the side of the corresponding limit group and the side wall of the first limit member 221 near the corresponding limit group.

[0058] For ease of explanation, Figure 4 The example shown is L>0mm.

[0059] When the value of L is too small, for example, L is -0.3mm, it means that the projection of the inclined starting point of the clearance surface 2110 near the corresponding limit group in the Y direction covers part of the projection of the side wall of the first limit member 221 near the corresponding limit group in the Y direction. Therefore, when the contact bridge 110 is installed in the corresponding installation area, the side of the convex rail near the first limit member 221 will interfere with the contact bridge 110, which increases the probability of deformation of the contact bridge 110 during installation and increases the probability of height difference between the two ends of the contact bridge 110. When the value of L is too large, for example, L is 0.2mm, it means that the clearance surface 2110 is too large. There is a 0.2mm distance between the projection of the inclined starting point of the side of surface 2110 near the corresponding limiting group in the Y direction and the projection of the side wall of the first limiting member 221 near the corresponding limiting group in the Y direction. While this arrangement avoids interference between the side of the convex rail near the first limiting member 221 and the touch bridge 110 when it is installed in the corresponding installation area, it also reduces the actual contact area when the convex rail and the groove are properly fitted. This could cause the touch bridge 110 to swing along the Y direction within the installation area, reducing the stability of its installation. Simultaneously, the value of L is proportional to the height of the second limiting member 222. The higher the height of the second limiting member 222, the greater the value of L should be to reduce the probability of deformation of the touch bridge 110 during installation; preferably, 0.3mm ≥ L ≥ -0.2mm.

[0060] Preferably, in this embodiment, L = 0mm, that is, the projection of the inclined starting point of the avoidance surface 2110 near the corresponding limit group in the Y direction is tangent to the projection of the side wall of the first limit member 221 near the corresponding limit group in the Y direction, so as to avoid the situation where the side of the convex rail near the first limit member 221 interferes with the contact bridge 110, and at the same time, improve the stability of the contact bridge 110 after installation.

[0061] Preferably, along the X direction, each second clearance fitting part 211 has an adjustment slope 212 on both sides, and the two adjustment slopes 212 on the same side are correspondingly disposed on the upper end face of the connecting body 210 with the two first limiting members 221. The gap between each adjustment slope 212 and the corresponding contact bridge 110 is set. During the height difference adjustment process, the adjustment slope 212 ensures that the activity space on both sides of the contact bridge 110 is further increased, thereby further increasing the rotational movement of the contact bridge 110. This prevents severe compression at one end of the contact bridge 110 due to manufacturing errors or excessive downward pressure, ensuring that the contact pressure on both sides of the contact bridge 110 remains basically consistent, thereby reducing the probability of a height difference between the two ends after the contact bridge 110 is installed in the corresponding installation area.

[0062] Since the contact device is usually used in conjunction with a spring, a positioning frustum 310 is provided on the side of the connecting body away from the limiting assembly. The connecting seat 200 is connected to the spring through the positioning frustum 310. Along the X direction, limiting ribs 320 are provided on both sides of the positioning frustum 310. The two limiting ribs 320 cooperate to limit the extension and retraction path of the spring and prevent the spring from bending or other situations during extension and retraction, so as to improve the use effect of the contact device.

[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A contact device, characterized in that, include: The moving contact assembly (100) includes two contact bridges (110), and a first clearance fitting part (111) is provided on the lower end surface of each of the two contact bridges (110); The connecting seat (200) includes a connecting body (210) and a limiting component (220). The limiting component (220) is disposed on the connecting body (210) and cooperates with the connecting body (210) to form two installation areas spaced apart along the Y direction. The two contact bridges (110) are correspondingly limited and connected to the two installation areas. The bottom wall of the installation area is provided with a second gap fitting part (211) that gap fits with the corresponding first gap fitting part (111). Of the first clearance fitting part (111) and the second clearance fitting part (211), one is configured as a convex rail and the other is configured as a groove.

2. The contact device according to claim 1, characterized in that, The groove has an arc-shaped cross-section along the Y direction, and the sidewall of the convex rail near the groove is correspondingly set as an arc-shaped surface.

3. The contact device according to claim 2, characterized in that, The line connecting the center of the convex rail and the center of the groove is perpendicular to the upper surface of the connecting body (210).

4. The contact device according to claim 3, characterized in that, Along the X direction, the two ends of the contact bridge (110) are symmetrically arranged about the line connecting the center of the convex rail and the center of the groove.

5. The contact device according to claim 1, characterized in that, The second gap fitting part (211) is configured as a convex rail, and the first gap fitting part (111) is configured as a groove, with both sides of the groove smoothly transitioning to the corresponding contact bridge (110).

6. The contact device according to claim 5, characterized in that, Along the Y direction, the first gap fitting portion (111) passes through the corresponding contact bridge (110), and the length of the second gap fitting portion (211) is equal to the length of the first gap fitting portion (111).

7. The contact device according to claim 6, characterized in that, The limiting component (220) includes two first limiting members (221) and two limiting groups. Along the Y direction, the two first limiting members (221) are both disposed in the middle of the connecting body (210), and the two first limiting members (221) are arranged at intervals relative to each other along the X direction. The first limiting portions (2211) on the two first limiting members (221) are parallel to the upper end surface of the connecting body (210). The first side limit of the contact bridge (110) is located between the two first limiting portions (2211) and the upper end of the connecting body (210). Along the Y direction, the two limiting groups are respectively disposed on both sides of the two first limiting members (221), and the second side of the contact bridge (110) abuts against the corresponding limiting group; The side of the convex rail closest to the first limiting member (221) is configured as a clearance surface (2110).

8. The contact device according to claim 7, characterized in that, From the first limiting member (221) to the limiting group, the direction is inclined in the direction away from the upper surface of the connecting body (210) corresponding to the avoidance surface (2110).

9. The contact device according to claim 8, characterized in that, 0.3mm≥L≥-0.2mm, where L is the distance between the inclined starting point of the clearance surface (2110) near the side corresponding to the limiting group and the side wall of the first limiting member (221) near the side corresponding to the limiting group.

10. The contact device according to claim 7, characterized in that, Along the X direction, each of the second gap fitting parts (211) is provided with an adjustment slope (212) on both sides, and the two adjustment slopes (212) on the same side are correspondingly provided with the two first limiting members (221) on the upper end surface of the connecting body (210), and the gap between each adjustment slope (212) and the corresponding contact bridge (110) is provided.

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