Hanging ring fixing support used for automobile seat safety belt test

Abstract

The utility model relates to the technical field of automobile seat safety belt testing, and discloses a lifting ring fixing support for automobile seat safety belt testing, which comprises a moving vehicle, a back support, a lifting ring inclination angle support assembly positioned on the front side of the back support and an upper auxiliary clamping assembly positioned on the outer side of the back support. According to the hanging ring fixing support for testing the automobile seat safety belt, the front vertical plate support and the rear vertical plate support are in modular connection through cooperation of the outer insertion plates and the inner insertion plates with the insertion grooves, bolt fastening is performed after alignment insertion, the assembly process is simplified, and the connection reliability is enhanced; the upper auxiliary clamping assembly and the lower auxiliary clamping assembly are rapidly connected to the outer side of the support in a sleeving mode through a clamping groove and a locking block structure, the position of a counterpoint clamping groove can be transversely adjusted, multi-scene testing is adapted, the lifting ring inclination angle support achieves multi-angle accurate adjustment through the three steps of loosening, rotating and locking by means of a rotating disc mechanism in an outer sleeve ring in cooperation with a 15-degree interval limiting groove and a fastening bolt, and the lifting ring inclination angle is accurately adjusted. The operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat belt testing technology, specifically to a hanging ring fixing bracket for automotive seat belt testing. Background Technology

[0002] Car seat belt testing is a crucial step in ensuring passenger safety. It aims to verify the strength, reliability, and protective performance of seat belts for occupants by simulating stress conditions in real-world scenarios. The tests cover static load tests (such as locking force and tensile strength testing) and dynamic collision tests (simulating the restraint effect during emergency braking or impact). Specialized equipment is required to simulate different working conditions. In these tests, the eyelet fixing bracket is an indispensable core auxiliary device. It is usually made of high-strength metal and has a stable clamping structure and precise positioning function.

[0003] Most existing car seat belt testing eyelet fixing brackets are directly welded to the entire device's bracket, without adopting a modular design. This means that during use, they can only maintain a single angle and cannot be adjusted in a timely manner according to actual conditions, which is quite limiting. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a hanging ring fixing bracket for testing automotive seat belts, thereby solving the problems mentioned in the background.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a ring fixing bracket for testing automotive seat belts, comprising a mobile vehicle and a back support, a ring tilt bracket assembly located on the front side of the back support, and an upper auxiliary clamping assembly located on the outside of the back support. A vertical rod bracket is fixedly installed on the lower part of the upper auxiliary clamping assembly, and a lower auxiliary clamping assembly is fixedly installed on the end of the vertical rod bracket away from the upper auxiliary clamping assembly. Two identical vertical rod brackets are provided, and the opposite surfaces of the two vertical rod brackets are provided with equal spacing. The alignment slots are distributed. A front vertical plate bracket is provided on the back of the lifting ring tilt bracket assembly. A rear vertical plate bracket is provided on the side of the front vertical plate bracket away from the lifting ring tilt bracket assembly. An outer plug-in plate is fixedly installed on the side of the front vertical plate bracket near the rear vertical plate bracket. An inner plug-in plate is fixedly installed on the side of the rear vertical plate bracket facing the front vertical plate bracket. An insertion groove adapted to the inner plug-in plate is opened on the side of the outer plug-in plate facing the rear vertical plate bracket. A safety belt lifting ring is detachably installed on the front side of the front vertical plate bracket through the lifting ring tilt bracket assembly.

[0008] Preferably, a slanted bracket is fixedly installed on the front side of the back support, a reinforcing bracket one is fixedly installed on the back support and the slanted bracket, a reinforcing bracket two is fixedly installed on the inner side of the back support, a seat bracket is fixedly installed on the top of the mobile vehicle, and a car seat body is provided on the upper part of the seat bracket.

[0009] Preferably, there are two identical inclined supports and reinforcing supports, and the two inclined supports and reinforcing supports are symmetrically distributed about the vertical center line of the moving vehicle.

[0010] The above technical solution, through the design of the inclined bracket and the second reinforcing bracket, can enhance the overall strength of the bracket and ensure that the bracket will not deform during the collision test.

[0011] Preferably, the outer connector plate and the inner connector plate are connected by a connector slot, and the outer connector plate and the alignment slot are connected by a connector.

[0012] With the above technical solution, the outer and inner plug-in plates are connected by plugging in the plug-in slots. During assembly, simply align the inner plug-in plate on the outside of the rear vertical plate bracket with the plug-in slot in the outer plug-in plate and insert it. Then, tighten it with bolts to complete the assembly. This minimizes the difficulty of operation and improves the convenience of assembly. Furthermore, the combination of the rear vertical plate bracket and the front vertical plate bracket can also be inserted into the inner side of the alignment slot through the outer plug-in plate.

[0013] Preferably, the lower auxiliary clamping assembly is sleeved on the outside of the reinforcing bracket two, and the upper auxiliary clamping assembly is sleeved on the outside of the back bracket. The lower auxiliary clamping assembly and the upper auxiliary clamping assembly have the same structure. The upper auxiliary clamping assembly includes a socket, and a cover plate is provided on the outside of the socket. A snap-fit ​​groove is opened on the side of the socket facing the cover plate. An upper locking block and a lower locking block are symmetrically installed on the side of the cover plate facing the socket.

[0014] Through the above technical solution, the design of the lower auxiliary clamping component and the upper auxiliary clamping component allows for quick insertion of the alignment slot onto the inner side of the back support. It also allows for changes in the lateral installation position of the alignment slot to meet the needs of seatbelt testing under different conditions. During the installation of the alignment slot, simply align the outer slot of the socket with the back support and insert it. Then, use bolts to lock the cover plate to the front of the socket. The upper and lower locking blocks can be used to firmly press it against the outer side of the back support. Similarly, when installing the lower auxiliary clamping component, it is first inserted onto the outer side of the reinforcing bracket two and then locked with bolts.

[0015] Preferably, the lifting ring tilt bracket assembly includes an outer ring and an alignment plate. An inner turntable is rotatably mounted on the inner side of the outer ring. An inclined plate is welded to the side of the inner turntable away from the outer ring. An inclined plate is detachably mounted on the front side of the inclined plate by screws. A limit groove and a bolt hole are formed on the front side of the inner turntable. An alignment groove is formed on the front side of the outer ring. A bolt hole is formed inside the alignment groove on the front side of the outer ring. A limit block is fixedly mounted on the side of the alignment plate facing the inner turntable. A first fastening bolt and a second fastening bolt are provided on the front side of the alignment plate.

[0016] Preferably, the limiting groove and the first bolt hole are each provided with three identical ones, the included angle between the two limiting grooves and the two first bolt holes is 15°, the limiting block is plugged into the limiting groove, the first fastening bolt is threaded into the first bolt hole, the second fastening bolt is threaded into the second bolt hole, and the alignment plate is plugged into the alignment groove.

[0017] The above technical solution, through the design of the inner turntable inside the outer ring, facilitates the adjustment of the seat belt ring's tilt angle. It is further secured by a limiting block and a limiting groove. The overall operation is simple and convenient. The specific usage process is as follows: First, loosen bolt holes one and two on the outer side of the alignment plate. Then, pull the alignment plate outwards until the limiting block and the limiting groove are completely separated. Next, rotate the inner turntable to adjust the tilt angle of the seat belt ring. After adjustment, align the limiting block with the limiting groove and insert it. Then, lock the first and second fastening bolts inside bolt holes one and two, respectively. The alignment groove limits the alignment plate, preventing it from rotating.

[0018] Compared with the prior art, this utility model provides a hanging ring fixing bracket for testing automotive seat belts, which has the following beneficial effects:

[0019] 1. The eyelet fixing bracket for testing automotive seat belts features a multi-dimensional support structure formed by adding symmetrically distributed inclined brackets and reinforcing bracket one to the front of the back support and reinforcing bracket two to the inside of the back support. This significantly improves the overall anti-collision deformation capability of the fixing bracket and ensures the stability of the bracket during collision testing. At the same time, the front and rear vertical plate brackets adopt a modular design with external and internal plug-in plates and plug-in slots. During assembly, only alignment and bolt tightening are required, reducing the difficulty of operation while improving the structural connection strength.

[0020] 2. This seatbelt buckle fixing bracket for automotive seat belt testing features an upper auxiliary clamping assembly and a lower auxiliary clamping assembly. These components are connected via a socket-mounted slot and a cover plate locking block structure, allowing for quick attachment to the back support or the outer side of the reinforcing bracket. It supports lateral adjustment of the alignment slots to accommodate various testing scenarios. The buckle tilt bracket assembly utilizes an inner turntable rotation mechanism within an outer ring, coupled with three sets of 15° angle limiting slots and fastening bolts. Precise multi-angle adjustment of the seatbelt buckle can be achieved through three steps: "loosening—rotating—locking." The operation is simple and the positioning is reliable, meeting diverse testing angle requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ;

[0024] Figure 4 This is a schematic diagram of the back support mounting structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the installation structure of the lifting ring tilt bracket assembly of this utility model. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the installation structure of the lifting ring tilt bracket assembly of this utility model. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the disassembled structure of the lifting ring tilt bracket assembly of this utility model;

[0028] Figure 8 This is a schematic diagram of the installation structure of the safety belt lifting ring of this utility model;

[0029] Figure 9 This is a schematic diagram of the disassembled alignment plate structure of this utility model. Figure 1 ;

[0030] Figure 10 This is a schematic diagram of the disassembled alignment plate structure of this utility model. Figure 2 ;

[0031] Figure 11 This is a cross-sectional structural diagram of the lifting ring tilt bracket assembly of this utility model.

[0032] The components include: 1. Mobile vehicle; 2. Backrest support; 3. Angled support; 4. Reinforcing support one; 5. Reinforcing support two; 6. Seat support; 7. Car seat body; 8. Lower auxiliary clamping assembly; 9. Upper auxiliary clamping assembly; 901. Socket; 902. Cover plate; 903. Upper locking block; 904. Lower locking block; 905. Snap-fit ​​groove; 10. Vertical rod support; 11. Alignment slot; 12. Rear vertical plate support; 13. Front vertical plate support; 14. External plug-in connector. 15. Inner insert plate; 16. Insert groove; 17. Lifting ring tilt bracket assembly; 1701. Outer ring; 1702. Inner turntable; 1703. Inclined plate one; 1704. Inclined plate two; 1705. Limiting groove; 1706. Bolt hole one; 1707. Alignment groove; 1708. Bolt hole two; 1709. Alignment plate; 1710. Limiting insert block; 1711. First fastening bolt; 1712. Second fastening bolt; 18. Safety belt lifting ring. Detailed Implementation

[0033] 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.

[0034] Example 1:

[0035] like Figure 1-11 As shown, this utility model provides a ring fixing bracket for testing car seat belts, including a mobile vehicle 1 and a back support 2, a ring tilt bracket assembly 17 located on the front side of the back support 2, and an upper auxiliary clamping assembly 9 located on the outside of the back support 2. A vertical rod bracket 10 is fixedly installed on the lower part of the upper auxiliary clamping assembly 9, and a lower auxiliary clamping assembly 8 is fixedly installed on the end of the vertical rod bracket 10 away from the upper auxiliary clamping assembly 9. Two identical vertical rod brackets 10 are provided, and the opposite surfaces of the two vertical rod brackets 10 are provided with equally spaced alignment slots 11. The ring tilt... A front vertical plate bracket 13 is provided on the back of the corner bracket assembly 17. A rear vertical plate bracket 12 is provided on the side of the front vertical plate bracket 13 away from the lifting ring tilt bracket assembly 17. An outer plug plate 14 is fixedly installed on the side of the front vertical plate bracket 13 close to the rear vertical plate bracket 12. An inner plug plate 15 is fixedly installed on the side of the rear vertical plate bracket 12 facing the front vertical plate bracket 13. A plug groove 16 adapted to the inner plug plate 15 is opened on the side of the outer plug plate 14 facing the rear vertical plate bracket 12. A safety belt lifting ring 18 is detachably installed on the front side of the front vertical plate bracket 13 through the lifting ring tilt bracket assembly 17.

[0036] Example 2:

[0037] like Figure 2-11 As shown, as an improvement on the previous embodiment, to demonstrate the overall strength of the fixed bracket for the car seat belt test, a diagonal bracket 3 is fixedly installed on the front side of the back support 2, a reinforcing bracket 4 is fixedly installed on the back support 2 and the diagonal bracket 3, a reinforcing bracket 5 is fixedly installed on the inner side of the back support 2, a seat bracket 6 is fixedly installed on the top of the moving vehicle 1, and a car seat body 7 is provided on the upper part of the seat bracket 6. Two identical diagonal brackets 3 and two reinforcing brackets 4 are provided, and both diagonal brackets 3 and reinforcing brackets 4 are symmetrically distributed about the vertical centerline of the moving vehicle 1. The advantage is that the design of the diagonal brackets 3 and the reinforcing bracket 5 strengthens the overall bracket strength, ensuring that the entire bracket will not deform during a collision test.

[0038] Example 3:

[0039] like Figure 2-11 As shown, as an improvement on the previous embodiment, to facilitate the assembly of the rear vertical plate bracket 12 and the front vertical plate bracket 13, the outer insertion plate 14 and the inner insertion plate 15 are connected by insertion slots 16, and the outer insertion plate 14 is also connected to the alignment slot 11 by insertion. The advantage is that by connecting the outer insertion plate 14 and the inner insertion plate 15 through insertion slots 16, during assembly, simply align the inner insertion plate 15 on the outside of the rear vertical plate bracket 12 with the insertion slot 16 in the outer insertion plate 14, insert it, and then tighten it with bolts to complete the assembly. This minimizes operational difficulty and improves assembly convenience. Furthermore, the assembly of the rear vertical plate bracket 12 and the front vertical plate bracket 13 can also be inserted into the inner side of the alignment slot 11 through the outer insertion plate 14.

[0040] Example 4:

[0041] like Figure 2-11As shown, as an improvement to the previous embodiment, to facilitate the installation of the lifting ring tilt bracket assembly 17, the lower auxiliary clamping assembly 8 is sleeved on the outside of the reinforcing bracket 2 5, and the upper auxiliary clamping assembly 9 is sleeved on the outside of the back bracket 2. The lower auxiliary clamping assembly 8 and the upper auxiliary clamping assembly 9 have the same structure. The upper auxiliary clamping assembly 9 includes a socket 901, and a cover plate 902 is provided on the outside of the socket 901. A snap-fit ​​groove 905 is opened on the side of the socket 901 facing the cover plate 902. The side of the cover plate 902 facing the socket 901 is provided with an upper locking block 903 and a lower locking block 904 that are symmetrically installed. The advantage is that, through the design of the lower auxiliary clamping component 8 and the upper auxiliary clamping component 9, the alignment slot 11 can be quickly fitted onto the inner side of the back support 2, and the lateral installation position of the alignment slot 11 can also be changed to meet the seat belt test under different conditions. During the installation of the alignment slot 11, simply align the snap-fit ​​slot 905 on the outside of the socket 901 with the back support 2 and insert it, and then lock the cover plate 902 on the front side of the socket 901 with bolts. The upper locking block 903 and the lower locking block 904 can be used to press tightly against the outside of the back support 2. Similarly, when installing the lower auxiliary clamping component 8, it is also first fitted onto the outside of the reinforcing bracket 2 5, and then locked with bolts.

[0042] Example 5:

[0043] like Figure 2-11As shown, as an improvement on the previous embodiment, in order to achieve the tilt angle adjustment of the seat belt eyelet 18, the eyelet tilt angle bracket assembly 17 includes an outer ring 1701 and an alignment plate 1709. An inner turntable 1702 is rotatably mounted on the inner side of the outer ring 1701. An inclined plate 1703 is welded to the side of the inner turntable 1702 away from the outer ring 1701. An inclined plate 2 1704 is detachably mounted on the front side of the inclined plate 1703 by screws. A limit groove 1705 and a bolt hole 1706 are formed on the front side of the inner turntable 1702. An alignment groove 1707 is formed on the front side of the outer ring 1701. A bolt is formed inside the alignment groove 1707 on the front side of the outer ring 1701. Hole 1708, a limiting block 1710 is fixedly installed on the side of the alignment plate 1709 facing the inner turntable 1702. The front side of the alignment plate 1709 is provided with a first fastening bolt 1711 and a second fastening bolt 1712. The limiting groove 1705 and the bolt hole 1706 are all provided with three identical ones. The included angle between the two limiting grooves 1705 and the two bolt holes 1706 is 15°. The limiting block 1710 is plugged into the limiting groove 1705. The first fastening bolt 1711 is threaded into the bolt hole 1706. The second fastening bolt 1712 is threaded into the bolt hole 1708. The alignment plate 1709 is plugged into the alignment groove 1707. The advantage is that the design of the inner turntable 1702 inside the outer ring 1701 facilitates the adjustment of the tilt angle of the seat belt ring 18. It is also secured by the limiting block 1710 and the limiting groove 1705. The overall operation is simple and convenient. The specific usage process is as follows: First, loosen the bolt holes 1706 and 1708 on the outside of the alignment plate 1709. Then, pull the alignment plate 1709 outwards until the limiting block 1710 is completely separated from the limiting groove 1705. Then, rotate the inner turntable 1702 to adjust the tilt angle of the seat belt ring 18. After adjustment, insert the limiting block 1710 into the limiting groove 1705. Then, lock the first fastening bolt 1711 and the second fastening bolt 1712 inside the bolt holes 1706 and 1708 respectively. The alignment groove 1707 limits the alignment plate 1709, preventing it from rotating.

[0044] Working principle: In use, first loosen the bolt holes 1706 and 1708 on the outer side of the alignment plate 1709, then pull the alignment plate 1709 outward until the limiting block 1710 is completely separated from the limiting groove 1705. Then, rotate the inner turntable 1702 to adjust the tilt angle of the seat belt ring 18. After adjustment, insert the limiting block 1710 into the limiting groove 1705, and then lock the first fastening bolt 1711 and the second fastening bolt 1712 into the bolt holes 1706 and 1708 respectively. The alignment plate 1709 is limited by the alignment groove 1707 to prevent it from rotating. At this time, the tilt angle of the seat belt ring 18 can be adjusted. Through the design of the lower auxiliary clamping component 8 and the upper auxiliary clamping component 9, the alignment slot 11 can be quickly fitted onto the inner side below the back support 2, and the lateral installation position of the alignment slot 11 can also be changed to meet different needs. In the seat belt test under certain conditions, during the installation of the alignment slot 11, simply align the outer slot 905 of the socket 901 with the back bracket 2 and insert it. Then, use bolts to lock the cover plate 902 to the front of the socket 901. The upper locking block 903 and the lower locking block 904 can be used to press tightly against the outer side of the back bracket 2. Similarly, when installing the lower auxiliary clamping component 8, it is first sleeved on the outer side of the reinforcing bracket 2 5 and then locked with bolts. The outer insertion plate 14 and the inner insertion plate 15 are connected by insertion slots 16. When assembling, simply align the inner insertion plate 15 on the outer side of the rear vertical plate bracket 12 with the insertion slots 16 in the outer insertion plate 14 and insert it. Then, use bolts to tighten it to complete the assembly. This minimizes the difficulty of operation and improves the convenience of assembly. Furthermore, the combination of the rear vertical plate bracket 12 and the front vertical plate bracket 13 can also be inserted into the inner side of the alignment slot 11 through the outer insertion plate 14.

[0045] 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 ring fixing bracket for testing automotive seat belts, comprising a moving vehicle (1) and a back support (2), a ring tilt bracket assembly (17) located on the front side of the back support (2), and an upper auxiliary clamping assembly (9) located on the outside of the back support (2), characterized in that: A vertical rod bracket (10) is fixedly installed on the lower part of the upper auxiliary clamping assembly (9). A lower auxiliary clamping assembly (8) is fixedly installed on the end of the vertical rod bracket (10) away from the upper auxiliary clamping assembly (9). Two identical vertical rod brackets (10) are provided. The opposite surfaces of the two vertical rod brackets (10) are provided with equally spaced alignment slots (11). A front vertical plate bracket (13) is provided on the back of the lifting ring tilt bracket assembly (17). The side of the front vertical plate bracket (13) away from the lifting ring tilt bracket assembly (17) A rear vertical plate bracket (12) is provided. An outer plug plate (14) is fixedly installed on the side of the front vertical plate bracket (13) near the rear vertical plate bracket (12). An inner plug plate (15) is fixedly installed on the side of the rear vertical plate bracket (12) facing the front vertical plate bracket (13). The outer plug plate (14) facing the rear vertical plate bracket (12) has a plug groove (16) that matches the inner plug plate (15). A safety belt hook (18) is detachably installed on the front side of the front vertical plate bracket (13) through a hook tilt bracket assembly (17).

2. The hanger fixing support for seat belt test of car seat according to claim 1, characterized in that: A slanted bracket (3) is fixedly installed on the front side of the back support (2), a reinforcing bracket (4) is fixedly installed on the back support (2) and the slanted bracket (3), a reinforcing bracket (5) is fixedly installed on the inner side of the back support (2), a seat bracket (6) is fixedly installed on the top of the mobile vehicle (1), and a car seat body (7) is provided on the upper part of the seat bracket (6).

3. The hanger fixing support for seat belt test of car seat according to claim 2, characterized in that: The inclined support (3) and the reinforcing support (4) are provided in two identical sets, and the two inclined supports (3) and the reinforcing support (4) are symmetrically distributed about the vertical center line of the moving vehicle (1).

4. The hanger fixing support for seat belt test of car seat according to claim 1, characterized in that: The outer plug-in plate (14) and the inner plug-in plate (15) are plugged in through the plug-in slot (16), and the outer plug-in plate (14) and the alignment slot (11) are plugged in.

5. The hanger fixing support for seat belt test of car seat according to claim 2, characterized in that: The lower auxiliary clamping assembly (8) is sleeved on the outside of the reinforcing bracket 2 (5), and the upper auxiliary clamping assembly (9) is sleeved on the outside of the back bracket (2). The lower auxiliary clamping assembly (8) and the upper auxiliary clamping assembly (9) have the same structure. The upper auxiliary clamping assembly (9) includes a socket (901). A cover plate (902) is provided on the outside of the socket (901). A snap-fit ​​groove (905) is opened on the side of the socket (901) facing the cover plate (902). A symmetrically installed upper locking block (903) and lower locking block (904) are provided on the side of the cover plate (902) facing the socket (901).

6. The hanger fixing support for seat belt test of a car seat according to claim 1, characterized in that: The lifting ring tilt bracket assembly (17) includes an outer ring (1701) and an alignment plate (1709). An inner turntable (1702) is rotatably mounted on the inner side of the outer ring (1701). An inclined plate (1703) is welded to the side of the inner turntable (1702) away from the outer ring (1701). An inclined plate (1704) is detachably mounted on the front side of the inclined plate (1703) by screws. A limiting groove (1705) is formed on the front side of the inner turntable (1702). The outer ring (1701) has a bolt hole 1 (1706) and a positioning groove (1707) on the front side. The outer ring (1701) has a bolt hole 2 (1708) inside the positioning groove (1707) on the front side. The positioning plate (1709) has a limiting block (1710) fixedly installed on the side facing the inner turntable (1702). The positioning plate (1709) has a first fastening bolt (1711) and a second fastening bolt (1712) on the front side.

7. The hanger fixing support for seat belt test of a car seat according to claim 6, characterized in that: The limiting groove (1705) and the first bolt hole (1706) are each provided with three identical ones. The included angle between the two limiting grooves (1705) and the two first bolt holes (1706) is 15°. The limiting plug (1710) is plugged into the limiting groove (1705). The first fastening bolt (1711) is threaded into the first bolt hole (1706). The second fastening bolt (1712) is threaded into the second bolt hole (1708). The alignment plate (1709) is plugged into the alignment groove (1707).

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