High strength trailer arm

Abstract

The utility model relates to the field of trailer tool discloses a high -strength trailer arm. It includes connecting arm, connecting seat and trailer piece, connecting arm is suitable for with vehicle connection, connecting seat and connecting arm slip rotation connection to make trailer piece steering to the back side of connecting arm and store, connecting seat includes connecting block, gear pin shaft and two respectively left and right sides of connecting arm and with connecting block fixed connection side plate, connecting block is located in the front side of connecting arm, and trailer piece and connecting block are detachably connected, gear pin shaft is located in the back side of connecting arm, and is connected with two side plate insertion, the back side of connecting arm is equipped with a plurality of gear arc grooves along the vertical direction interval, and one side of gear pin shaft is suitable for being located in any gear arc groove. The utility model does not make connecting arm produce hole, increases the strength of connecting arm, connecting seat and trailer piece rotate to the back side of connecting arm and store, reduce the risk of collision to other objects, reduce the noise produced because of shaking, reduce the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of trailer tools technology, and more specifically, to a high-strength trailer arm. Background Technology

[0002] A trailer boom primarily provides a robust, reliable, and standardized connection point for towing trailers or carrying cargo. Existing trailer booms consist of a connecting arm, a trailer ball joint, and a ball seat. The connecting arm is an L-shaped rod, with its crossbar fixedly connected to the vehicle. The trailer ball joint and ball seat are fixedly connected by pins, with the ball seat connected by a pin to the side of the connecting arm's vertical rod furthest from the crossbar. To accommodate trailers of different heights, the connecting arm's vertical rod has multiple pin holes spaced vertically, allowing the ball seat to be inserted into any of these holes for height adjustment. However, these pin holes are through holes, reducing the strength of the connecting arm. Furthermore, when the trailer boom is not in use but is always mounted on the vehicle for future use, the ball seat and trailer ball joint remain on the side of the connecting arm's vertical rod furthest from the crossbar and are in a rotating state, occupying considerable space and easily colliding with other objects when reversing. Utility Model Content

[0003] To address at least one of the aforementioned problems, this utility model provides a high-strength trailer arm, comprising a connecting arm, a connecting seat, and a trailer component. The connecting arm is adapted to connect with a vehicle. The connecting seat is sleeved on the connecting arm and slidably and rotatably connected to the connecting arm. The connecting seat is adapted to drive the trailer component to rotate relative to the connecting arm, so that the trailer component is turned to the rear side of the connecting arm for storage. The connecting seat includes a connecting block, side plates, and a gear shift pin. Two side plates are provided, located on the left and right sides of the connecting arm respectively, and both side plates are fixedly connected to the connecting block. The connecting block is located on the front side of the connecting arm, and the trailer component is detachably connected to the connecting block. The trailer component is adapted to connect with a towing device. The gear shift pin is located on the rear side of the connecting arm and is inserted into the two side plates. The rear side of the connecting arm has multiple gear shift arc grooves spaced vertically, and one side of the gear shift pin is adapted to be located in any one of the gear shift arc grooves.

[0004] Optionally, the trailer component includes a first trailer ball joint and a second trailer ball joint that are fixedly connected, wherein the outer diameter of the first trailer ball joint is larger than the outer diameter of the second trailer ball joint.

[0005] Optionally, the trailer assembly further includes a third trailer ball joint, which is fixedly connected to the first trailer ball joint or the second trailer ball joint.

[0006] Optionally, the trailer component further includes a shackle, which is fixedly connected to the first trailer ball joint or the second trailer ball joint.

[0007] Optionally, the connecting seat has an insertion slot, one end of the trailer component is inserted into the insertion slot, the connecting seat has a connecting pin hole communicating with the insertion slot, a connecting pin is inserted into the connecting pin hole, and the connecting pin passes through the trailer component.

[0008] Optionally, the outer wall of the trailer component is provided with a protrusion, and the groove wall of the insertion slot is provided with a mating notch for the protrusion to be inserted. The groove wall of the insertion slot is provided with a limiting ring groove in the circumferential direction that communicates with the mating notch. When the trailer component rotates in the insertion slot, it will drive the protrusion into the limiting ring groove to lock the trailer component when it is pulled out.

[0009] Optionally, the connecting blocks and the connecting arms are arranged at intervals, and the connecting blocks are threaded with a clamping bolt. When the gear pin is located in the gear groove, the clamping bolt is adapted to clamp against the connecting arm.

[0010] Optionally, the front side of the connecting arm is provided with a plurality of positioning grooves spaced apart, and one end of the clamping bolt is adapted to be inserted into any one of the positioning grooves.

[0011] Optionally, each side plate is provided with a rotating pin, and the left and right sides of the connecting arm are provided with elongated grooves. One end of the rotating pin is inserted into the corresponding elongated groove and is adapted to move within the elongated groove. When the side plate drives the rotating pin to move to the end of the elongated groove, the side plate, the connecting block and the trailer are adapted to rotate around the rotating pin as the rotating axis to the rear side of the connecting arm.

[0012] Optionally, the outer wall of the side plate is provided with a pin hole, the pin hole penetrates the side plate, and the rotating pin is interference-fitted into the pin hole; the bottom of the long waist groove is provided with a pin insertion hole, both of the long waist grooves are connected to the pin insertion hole, and the length of the pin insertion hole is greater than the total length of the two rotating pins; when the connecting seat is disassembled, it is adapted to drive the rotating pin out of the pin hole and insert it into the pin insertion hole.

[0013] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0014] 1. The connecting seat is directly sleeved on the connecting arm. In order to match the height adjustment, the stop pin can be located in different stop arc grooves on the rear side of the connecting arm. The stop arc grooves do not create holes in the connecting arm, so that the connecting arm maintains its original thickness and increases the strength of the connecting arm.

[0015] 2. When the trailer arm is not in use, the connecting seat can drive the trailer to rotate relative to the connecting arm around the rotating pin, so that the connecting seat and the trailer can rotate to the rear of the connecting arm (the side closer to the rear of the vehicle) for storage. This shortens the length of the trailer arm and reduces the risk of colliding with other objects when reversing. In addition, under the action of the rotating pin, even if the gear shift pin is lost during driving, the connecting seat will not fall off and be lost, thus also having an anti-loss function.

[0016] 3. The spacing between the connecting block and the connecting arm provides sufficient space for the connecting seat to rotate, and the gear pin does not need to be disassembled when adjusting the height of the connecting seat, which improves the convenience of adjusting the height of the connecting seat. The setting of the abutment bolt prevents the connecting seat from shaking relative to the connecting arm and generating noise. At the same time, it also ensures that the gear pin can be stably located in the corresponding gear arc groove, which improves the stability of the connecting seat after the height is adjusted.

[0017] 4. There are multiple specifications of trailer ball joints to choose from, and users can select the appropriate trailer ball joint according to their needs. In addition, users can also remove the trailer parts and replace them with more diverse trailer parts to meet the different needs of different users.

[0018] 5. When installing the rotating pin, it is interference-fitted with the side plate. When disassembling the connecting seat, a tool can be used to knock the rotating pin into the pin hole and completely disengage the rotating pin from the pin hole. This ensures the rotation and height adjustment of the connecting seat and provides a disassembly solution. When repairing or replacing, only the damaged parts need to be replaced, without replacing the entire trailer arm, thus reducing maintenance costs. Attached Figure Description

[0019] Figure 1 The trailer arm structure in Embodiment 1 of this utility model Figure 1 ;

[0020] Figure 2 The trailer arm structure in Embodiment 1 of this utility model Figure 2 ;

[0021] Figure 3 This is an exploded view of the trailer arm in Embodiment 1 of this utility model;

[0022] Figure 4 This is a diagram showing the steering and storage state of the connecting seat and trailer component in Embodiment 1 of this utility model;

[0023] Figure 5 This is a right view of the connecting arm in Embodiment 1 of this utility model;

[0024] Figure 6 This is an exploded view of the connecting seat and trailer component in Embodiment 1 of this utility model;

[0025] Figure 7This is a structural diagram of the trailer arm in Embodiment 2 of this utility model;

[0026] Figure 8 This is a structural diagram of the trailer arm in Embodiment 3 of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Connecting arm; 11. Horizontal bar; 12. Vertical bar; 13. Gear position arc groove; 14. Positioning groove; 15. Long waist groove; 151. Pin insertion hole; 16. Positioning arc groove; 2. Connecting seat; 21. Connecting block; 211. Tightening bolt; 22. Side plate; 23. Gear position pin; 24. Rotating pin; 25. Insertion groove; 26. Connecting pin hole; 27. Connecting pin; 28. Through hole; 29. ​​Limiting ring groove; 3. Trailer component; 31. Connecting column; 311. Protrusion; 32. First trailer ball joint; 33. Second trailer ball joint; 34. Third trailer ball joint; 35. Shackle. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-8 This application will be described in further detail.

[0029] The accompanying drawings of this utility model embodiment provide a coordinate system XYZ, where the positive direction of the X-axis represents the right, the negative direction of the X-axis represents the left, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom.

[0030] This utility model provides a high-strength trailer arm. Example 1: Refer to... Figure 1 The high-strength trailer arm includes a connecting arm 1, a connecting seat 2, and a trailer component 3. The connecting arm 1 is adapted to connect with a vehicle, and the connecting seat 2 is sleeved on the connecting arm 1 and slidably and rotatably connected to the connecting arm 1. The connecting seat 2 is adapted to drive the trailer component 3 to rotate relative to the connecting arm 1, so that the trailer component 3 is turned to the rear side of the connecting arm 1 for storage, shortening the length of the trailer arm and reducing the risk of colliding with other objects when reversing.

[0031] Reference Figure 1 and Figure 2 The connecting arm 1 includes a horizontal bar 11 and a vertical bar 12, which are L-shaped and welded together. The horizontal bar 11 is located behind the vertical bar 12 and is connected to the vehicle. The connecting seat 2 is fitted onto the vertical bar 12 and slides on it, extending forward of the vertical bar 12. The trailer part 3 is connected to the front of the connecting seat 2.

[0032] The connecting seat 2 includes a connecting block 21, side plates 22, and shift pins 23. Two side plates 22 are provided, located on the left and right sides of the connecting arm 1, respectively. The connecting block 21 is located on the front side of the vertical rod 12 and between the two side plates 22. The connecting block 21 is integrally formed with the two side plates 22, thereby increasing the strength of the connecting seat 2. In another embodiment, the connecting block 21 can be welded to the two side plates 22. The trailer part 3 is detachably connected to the connecting block 21. The trailer part 3 is suitable for connection with a towing device (such as a coupler on a motorhome, a connecting component of a towing equipment, etc.). Two shift pins 23 are spaced apart vertically. Both shift pins 23 are located on the rear side of the connecting arm 1. The shift pins 23 are inserted into and connected to the two side plates 22, and are fixed to the two side plates 22 by cotter pins (existing mechanical connectors).

[0033] Reference Figure 2 and Figure 3 A stop groove 13 is provided on the rear side of the vertical rod 12. The stop groove 13 is a semi-circular groove adapted to the stop pin 23 and extends through the vertical rod 12 in the left-right direction. Multiple stop grooves 13 are provided vertically on the vertical rod 12 at intervals. One side of the stop pin 23 can be inserted into any stop groove 13 to adjust the height of the entire connecting seat 2. When the stop pin 23 is located in any stop groove 13, the connecting block 21 and the connecting arm 1 are spaced apart. Thus, when adjusting the height of the connecting seat 2, the connecting seat 2 can be pushed backward to completely disengage the stop pin 23 from the corresponding stop groove 13 without the need for additional disassembly and assembly of the stop pin 23, improving the convenience of height adjustment.

[0034] The connecting block 21 has at least two threaded holes spaced apart on its front side, each threaded hole penetrating the connecting block 21, and each threaded hole contains a locking bolt 211 threaded into it. When the gear shift pin 23 is located within the gear shift arc groove 13, tightening the locking bolt 211 causes it to abut against the front side of the vertical rod 12, preventing the connecting seat 2 from wobbling relative to the vertical rod 12 and causing collisions or abnormal noises. Simultaneously, it ensures that the gear shift pin 23 is stably positioned within the gear shift arc groove 13, improving the stability of the connecting seat 2 after height adjustment. The front side of the vertical rod 12 has multiple positioning grooves 14 spaced apart along the vertical direction. The side of the locking bolt 211 closest to the vertical rod 12 is suitable for insertion into the corresponding positioning groove 14 to limit the movement of the connecting seat 2, further improving the stability of the connecting seat 2 after height adjustment.

[0035] Reference Figure 2 and Figure 3The side plates 22 are fitted to the vertical rod 12. Each side plate 22 has a pin hole on its outer wall away from the vertical rod 12. The pin hole penetrates the side plate 22, and a rotating pin 24 is inserted into the pin hole with an interference fit. Considering the stability after the rotating pin 24 is interference-fitted to the side plate 22, the rotating pin 24 and the pin hole are tightly fitted. During installation, a tool is needed to forcefully hammer the rotating pin 24 into the pin hole. Long slots 15 are provided on both the left and right sides of the vertical rod 12, extending vertically. One end of the rotating pin 24 passes through the pin hole and is inserted into the long slot 15. When the side plate 22 moves relative to the vertical rod 12, the rotating pin 24 moves within the long slot 15. When the side plate 22 drives the rotating pin 24 to move to the uppermost end of the long waist groove 15, since there is a certain distance between the connecting block 21 and the vertical rod 12, the side plate 22, the connecting block 21 and the trailer part 3 can rotate around the rotating pin 24 as the rotation axis to the rear of the vertical rod 12 for storage, thus shortening the length of the trailer arm.

[0036] Reference Figures 2 to 5 The front side of the vertical rod 12 is provided with positioning arc grooves 16, which are the same number as the number of gear pins 23 and correspond one-to-one. The positioning arc grooves 16 are semi-circular grooves. When the connecting block 21 and the trailer part 3 rotate to the rear of the vertical rod 12, the gear pins 23 are located in the positioning arc grooves 16, and at the same time, the locking bolts 211 abut against the rear side of the vertical rod 12, thereby limiting the connection seat 2 and preventing it from shaking.

[0037] The bottom of the elongated groove 15 is provided with a pin insertion hole 151. Both elongated grooves 15 are connected to the pin insertion hole 151, and the length of the pin insertion hole 151 is greater than the total length of the two rotating pins 24. When installing, the rotating pin 24 is interference-fitted with the side plate 22. When disassembling the connecting seat 2, a tool can be used to knock the rotating pin 24 into the pin insertion hole 151 and completely disengage the rotating pin 24 from the pin hole, making disassembly relatively convenient.

[0038] The trailer component 3 includes an integrally formed connecting post 31, a first trailer ball joint 32, and a second trailer ball joint 33, resulting in higher strength. In another embodiment, the connecting post 31 can be welded or threaded to the first trailer ball joint 32 or the second trailer ball joint 33. The connecting post 31, the first trailer ball joint 32, and the second trailer ball joint 33 are T-shaped, with their axes coinciding. The outer diameter of the first trailer ball joint 32 is larger than that of the second trailer ball joint 33. The first and second trailer ball joints 32 and 33 are suitable for connection to a towing device, allowing the user to select a suitable trailer ball joint as needed. The connecting post 31 is detachably connected to the connecting block 21, allowing the user to replace it with a more diverse or better-fitting trailer component 3 as needed.

[0039] Reference Figure 3 and Figure 6The connecting block 21 has an insertion slot 25 on its front side, and the connecting post 31 is inserted into the insertion slot 25. The outer wall of the connecting post 31 has a through hole that passes through the connecting post 31. The outer wall of the side plate 22 has a connecting pin hole 26 that passes through the connecting block 21 and the two side plates 22, and communicates with the insertion slot 25. A connecting pin 27 is inserted into the connecting pin hole 26, passing through the through hole. One end of the connecting pin 27 protrudes from the connecting pin hole 26 and is fixedly positioned by a cotter pin, thereby connecting the trailer component 3 and the connecting seat 2 together. When replacing the trailer component 3, the connecting pin 27 can be removed.

[0040] The top of the connecting block 21 has a through hole 28, which passes through the connecting block 21 and communicates with the insertion slot 25. When the connecting column 31 is rotated so that the through hole communicates with the through hole 28, the connecting pin 27 can be inserted into the through hole 28 and the through hole, so that the orientation (vertical or horizontal) of the trailer ball head can still be fixed after it is adjusted and changed as needed.

[0041] Reference Figure 3 and Figure 6 The outer wall of the connecting post 31 is integrally formed with two symmetrical protrusions 311. The groove wall of the insertion slot 25 has two mating notches for inserting the protrusions 311. A limiting ring groove 29 communicating with the mating notches is circumferentially formed on the groove wall of the insertion slot 25, and the limiting ring grooves 29 are spaced apart from the opening of the insertion slot 25. After the connecting post 31 is inserted into the insertion slot 25 and rotates 90 degrees within the insertion slot 25, the through hole communicates with the connecting pin hole 26; the protrusions 311 rotate into the limiting ring grooves 29, preventing the connecting post 31 from being pulled out of the insertion slot 25. Thus, the two protrusions 311 can serve as stress points, distributing the force on the connecting pin 27 and effectively improving the strength during traction.

[0042] The implementation principle of a high-strength trailer arm according to this application embodiment is as follows: the connecting seat 2 is directly sleeved on the connecting arm 1. In order to match the height adjustment, the gear pin 23 can be located in different gear arc grooves 13 on the rear side of the connecting arm 1. The gear arc grooves 13 do not create holes in the connecting arm 1, so that the connecting arm 1 maintains its original thickness and increases the strength of the connecting arm 1. When the trailer arm is not in use, the connecting seat 2 can drive the trailer component 3 to rotate relative to the connecting arm 1 around the rotating pin 24 as the rotation axis, so that the connecting seat 2 and the trailer component 3 rotate to the rear side of the connecting arm 1 (the side closer to the rear of the vehicle) for storage, shortening the length of the trailer arm and reducing the risk of colliding with other objects when reversing.

[0043] Example 2: Refer to Figure 7The difference between this embodiment and Embodiment 1 is that the trailer component 3 further includes a third trailer ball joint 34. The third trailer ball joint 34 is located on the sidewall between the first trailer ball joint 32 and the second trailer ball joint 33. The third trailer ball joint 34 is integrally formed with the first trailer ball joint 32 and the second trailer ball joint 33, thus providing the user with more options. In another embodiment, the third trailer ball joint 34 can be welded to the first trailer ball joint 32 or the second trailer ball joint 33; or it can be threaded.

[0044] Example 3: Refer to Figure 8 The difference between this embodiment and Embodiment 1 is that the trailer component 3 also includes a shackle 35 (a prior art connecting tool). An mounting component is integrally formed on the sidewall between the first trailer ball joint 32 and the second trailer ball joint 33. The shackle 35 is connected to the mounting component via a pin, thus providing the user with an additional option. In another embodiment, the connector can be welded to the first trailer ball joint 32 or the second trailer ball joint 33; or threaded.

[0045] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0046] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, 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 disclosure.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0049] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A high-strength trailer arm, characterized in that: The system includes a connecting arm (1), a connecting seat (2), and a trailer hitch (3). The connecting arm (1) is adapted to connect with a vehicle. The connecting seat (2) is sleeved on the connecting arm (1) and is slidably and rotatably connected to the connecting arm (1). The connecting seat (2) is adapted to drive the trailer hitch (3) to rotate relative to the connecting arm (1), so that the trailer hitch (3) turns to the rear side of the connecting arm (1) for storage. The connecting seat (2) includes a connecting block (21), a side plate (22), and a gear shift pin (23). Two side plates (22) are provided, and the two side plates (22) are respectively located on the vehicle. The left and right sides of the connecting arm (1) and both side plates (22) are fixedly connected to the connecting block (21); the connecting block (21) is located on the front side of the connecting arm (1), the trailer part (3) is detachably connected to the connecting block (21), and the trailer part (3) is adapted to be connected to the traction device; the gear pin (23) is located on the rear side of the connecting arm (1) and is inserted into the two side plates (22); the rear side of the connecting arm (1) is provided with a plurality of gear arc grooves (13) spaced apart in the vertical direction, and one side of the gear pin (23) is adapted to be located in any one of the gear arc grooves (13).

2. The high-strength trailer arm according to claim 1, characterized in that: The trailer component (3) includes a first trailer ball joint (32) and a second trailer ball joint (33) that are fixedly connected, wherein the outer diameter of the first trailer ball joint (32) is larger than the outer diameter of the second trailer ball joint (33).

3. The high-strength trailer arm according to claim 2, characterized in that: The trailer component (3) also includes a third trailer ball joint (34), which is fixedly connected to the first trailer ball joint (32) or the second trailer ball joint (33).

4. The high-strength trailer arm according to claim 2, characterized in that: The trailer component (3) also includes a shackle (35), which is fixedly connected to the first trailer ball joint (32) or the second trailer ball joint (33).

5. The high-strength trailer arm according to claim 1, characterized in that: The connecting seat (2) has an insertion slot (25), one end of the trailer part (3) is inserted into the insertion slot (25), the connecting seat (2) has a connecting pin hole (26) communicating with the insertion slot (25), a connecting pin shaft (27) is inserted into the connecting pin hole (26), and the connecting pin shaft (27) passes through the trailer part (3).

6. The high-strength trailer arm according to claim 5, characterized in that: The outer wall of the trailer component (3) is provided with a protrusion (311), and the groove wall of the insertion slot (25) is provided with a mating notch for the protrusion (311) to be inserted. The groove wall of the insertion slot (25) is provided with a limiting ring groove (29) communicating with the mating notch in the circumferential direction. When the trailer component (3) rotates in the insertion slot (25), it will drive the protrusion (311) to rotate into the limiting ring groove (29) to lock the trailer component (3) when it is pulled out.

7. The high-strength trailer boom according to any one of claims 1-6, characterized in that: The connecting block (21) and the connecting arm (1) are arranged at intervals. The connecting block (21) is threaded with a clamping bolt (211). When the gear pin (23) is located in the gear groove (13), the clamping bolt (211) is adapted to clamp against the connecting arm (1).

8. The high-strength trailer arm according to claim 7, characterized in that: The connecting arm (1) has a plurality of positioning grooves (14) spaced apart on its front side, and one end of the clamping bolt (211) is adapted to be inserted into any one of the positioning grooves (14).

9. The high-strength trailer arm according to claim 7, characterized in that: Each of the side plates (22) is provided with a rotating pin (24), and the left and right sides of the connecting arm (1) are provided with long waist grooves (15). One end of the rotating pin (24) is inserted into the corresponding long waist groove (15) and is adapted to move within the long waist groove (15). When the side plate (22) drives the rotating pin (24) to move to the end of the long waist groove (15), the side plate (22), the connecting block (21) and the trailer part (3) are adapted to rotate to the rear side of the connecting arm (1) with the rotating pin (24) as the rotating axis.

10. The high-strength trailer arm according to claim 9, characterized in that: The outer wall of the side plate (22) is provided with a pin hole, which penetrates the side plate (22). The rotating pin (24) is inserted into the pin hole with an interference fit. The bottom of the long waist groove (15) is provided with a pin insertion hole (151). Both long waist grooves (15) are connected to the pin insertion hole (151). The length of the pin insertion hole (151) is greater than the total length of the two rotating pins (24). When the connecting seat (2) is disassembled, it is suitable to drive the rotating pin (24) out of the pin hole and insert it into the pin insertion hole (151).

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