Turnover locking structure of trailer frame

Abstract

The utility model relates to a trailer frame turnover locking structure which comprises an upper support, a lower support, a rotating center and a locking assembly, the lower support is detachably installed on the tail portion of an automobile, the upper support is rotationally connected to the lower support through the rotating center, and the trailer frame has a closed locking posture and a turnover unfolding posture. The locking assembly comprises a locking shaft sequentially penetrating through the upper support and the lower support, the upper support is provided with a special-shaped groove allowing the locking shaft to slide in and be clamped, the lower support is provided with a sliding hole allowing the locking shaft to slide along the special-shaped groove, the locking shaft is connected with a plug pin, one end of the plug pin is connected with a control end, and the control end is installed at the end, away from the tail of the automobile, of the lower support. The conditions that in the related technology, due to the fact that parking spaces are insufficient, the space around the automobile after parking is small, and the occupied space of a trailer frame is large, a user cannot open a trunk conveniently, and in the actual driving process of the automobile, accumulated water, stones and the like on the road surface are rolled, splashed and collided on the locking structure, and the locking structure is prone to being damaged, abraded and even invalid are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of trailer frames, in particular to a trailer frame flip locking structure. Background Art

[0002] At present, people usually carry luggage, daily necessities, bicycles and other items when traveling outdoors. Since the space in the trunk of a car is limited, it is difficult to put larger items such as bicycles in the trunk. Therefore, a trailer rack is installed at the rear of the car to load bicycles.

[0003] A Chinese utility model patent with publication number CN219564683U discloses a trailer frame flip locking structure, including a lower bracket, an upper bracket, a flip structure and a locking structure, wherein the first end of the upper bracket is hinged to the first end of the lower bracket through the flip structure; the locking structure includes a latch and a locking member, the latch is penetrated through the upper bracket, the locking member is arranged at the second end of the upper bracket, and the locking member is penetrated with a locking hole; the latch is provided with a first limiting column, the first end of the upper bracket is movably connected to a driving frame, the top of the driving frame is penetrated with a movable groove, both sides of the driving frame are penetrated with limiting waist holes for movably connecting the first limiting column, and a driving part is formed at the bottom of the driving frame to link the first limiting column to drive the latch to telescope along the length direction, and the latch and the locking hole cooperate to lock or unlock the upper bracket or the lower bracket.

[0004] In the above technical solution, the trailer frame itself occupies a large space due to the long bolt stroke. In actual application environment, in order to facilitate loading bicycles at any time, the trailer frame is often semi-permanently installed at the rear of the car. However, under the current situation of tight parking spaces, after parking, the space around the car is small. When the user opens the trunk, there is a defect that it is inconvenient for the user to open the trunk because the trailer frame itself occupies a large space.

[0005] In addition, the locking structure of the above technical solution is installed on the upper bracket, and the latch is exposed. During the actual driving of the car, road water, stones, etc. are crushed and splashed, and hit the locking structure, which can easily cause damage, wear and even failure of the locking structure. Utility Model Content

[0006] In order to improve the relevant technology, due to the tight parking space and the small space around the car after parking, while the trailer frame itself occupies a large space, it is inconvenient for users to open the trunk. During the actual driving of the car, road surface water, stones, etc. are crushed and splashed, and the impact on the locking structure can easily cause damage, wear and even failure of the locking structure. The present application provides a trailer frame flip locking structure to reduce the space occupied by the trailer frame itself. Users can still conveniently open the trunk without removing the trailer frame pre-installed at the rear of the car, thereby improving the user experience.

[0007] The present application provides a trailer frame flip locking structure, which adopts the following technical solutions:

[0008] A trailer frame flip locking structure, comprising an upper bracket, a lower bracket, a rotation center and a locking assembly installed in the lower bracket, the lower bracket is detachably installed on the rear of the vehicle, the upper bracket is rotatably connected to the lower bracket through the rotation center, the trailer frame has a closed locking posture and a flipping and unfolding posture, and the locking assembly comprises a locking shaft that sequentially penetrates the upper bracket and the lower bracket, the upper bracket is provided with a special-shaped groove for the locking shaft to slide into and engage, the lower bracket is provided with a sliding hole for the locking shaft to slide along the special-shaped groove, the locking shaft is connected with a latch, one end of the latch is connected with a control end, and the control end is installed at one end of the lower bracket away from the rear of the vehicle;

[0009] When the trailer frame is in the closed locking position, the upper bracket covers the lower bracket, and the locking shaft is located at one end of the sliding hole close to the rear of the vehicle and is clamped in the special-shaped groove;

[0010] When the trailer frame switches from the closed locking posture to the flipped and unfolded posture, the control end drives the pin away from the rear of the car, the locking shaft follows the pin and slides in the sliding hole until it reaches the notch of the special-shaped groove, the upper bracket rotates along the rotation center to move away from the lower bracket, and the pin disengages from the special-shaped groove.

[0011] Optionally, the control end includes a rotating plate and a foot pedal, a first rotating shaft arranged in the same direction as the locking shaft is provided on the side of the lower bracket away from the upper bracket, the rotating plate is rotatably connected to the first rotating shaft, the lower bracket is provided with a clearance hole for one end of the rotating plate to extend into, the other end of the rotating plate is connected to the latch, and the foot pedal is fixed to the end of the rotating plate away from the lower bracket.

[0012] Optionally, a vertical waist-shaped hole is formed at one end of the rotating plate extending into the lower bracket, and a guide shaft is provided at one end of the latch away from the locking shaft, and the guide shaft passes through the waist-shaped hole.

[0013] Optionally, a baffle is fixed to the side of the lower bracket away from the rear of the car, and the baffle is provided with a mounting hole for inserting the end of the pin away from the locking shaft, and a compression spring is sleeved on the pin, one end of the compression spring is against the baffle, and the guide shaft is located on the side of the compression spring close to the locking shaft.

[0014] Optionally, the foot pedal has a tread for a user to step on to control the rotation of the rotating plate, and the tread is a horizontal plane.

[0015] Optionally, a prefabricated bracket is fixed to a side of the upper bracket away from the lower bracket, and the prefabricated bracket is provided with a screw hole for screwing and fixing a pre-configured mounting seat.

[0016] Optionally, the special-shaped groove is a configuration groove, which includes a retreat branch groove and a limiting branch groove connected to the retreat branch groove, the retreat branch groove has a notch for the locking shaft to be inserted, the retreat branch groove is vertically arranged, and a yield surface is arranged at the notch of the limiting branch groove, the limiting branch groove is horizontally arranged, and when the trailer frame is in the closed locking posture, the limiting branch groove and the connecting part of the retreat branch groove are connected to the sliding hole.

[0017] Optionally, the rotation center includes a second rotation axis, and the upper bracket is rotationally connected to an end of the lower bracket away from the rear of the automobile via the second rotation axis.

[0018] Optionally, the second rotating shaft is a bolt, and the upper bracket is rotatably connected to the end of the lower bracket away from the rear of the car through the bolt, and a margin is left between the upper bracket and the lower bracket for the upper bracket to rotate around the bolt as the rotation center and offset along the length direction of the bolt.

[0019] By adopting the above technical solution, when the trailer frame is in a closed locking posture, the upper bracket is covered by the lower bracket, and the locking assembly is installed in the lower bracket. During the driving process of the vehicle, even if the road conditions are poor and there are splashing water or stones, the locking assembly will not be affected, which plays a role in protecting the locking assembly, reducing the wear of the locking assembly, and thus improving the durability of the locking assembly.

[0020] The upper bracket is locked to the lower bracket through the locking shaft, and the latch is used to drive the locking shaft to disengage or engage with the upper bracket, so that the latch does not need to span the upper bracket, reducing the length of the latch. The lower bracket is a single-arm structure, which makes the structure of the locking assembly more compact and reduces the space occupied when the trailer frame is installed at the rear of the car, thereby providing space for opening the trunk door.

[0021] When the user needs to switch the trailer frame from the closed locking posture to the flipped and unfolded posture, no tools are needed, only the latch is pulled through the control end, and then the upper bracket is flipped over, which is simple to operate; when the user needs to switch the trailer frame from the flipped and unfolded posture to the closed locking posture, the upper bracket is rotated in the opposite direction, and the latch is driven by the control end, and the latch pushes the locking shaft to move to the end of the sliding hole away from the rear of the car, so that the upper bracket covers the lower bracket, and the locking shaft slides into the special-shaped groove, and the compression spring drives the latch to move toward the rear of the car, thereby pushing the locking shaft to be clamped at the bottom of the special-shaped groove, so that the trailer frame is automatically locked. Even if the road is bumpy, the upper bracket and the lower bracket can still maintain a reliable lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the trailer frame flip locking structure.

[0024] Figure 2 It is a schematic diagram of the structure after the upper bracket is rotated 30 degrees counterclockwise.

[0025] Figure 3 It is an exploded view between the rotation center and the flip locking structure.

[0026] Figure 4 It is a schematic diagram of the structure of the locking assembly.

[0027] Figure 5 It is a schematic diagram of the connection structure between the control terminal and the plug.

[0028] Figure 6 Schematic diagram of the connection structure between the locking assembly and the rotating plate.

[0029] Figure 7 It is a structural schematic diagram of a mounting base being mounted on a trailer frame via a prefabricated bracket.

[0030] In the figure: 1. upper bracket; 2. lower bracket; 3. rotation center; 4. locking shaft; 5. special-shaped groove; 6. sliding hole; 7. latch; 8. control end; 9. cavity; 10. through hole; 81. rotating plate; 82. pedal; 11. first rotating shaft; 12. clearance hole; 13. waist-shaped hole; 14. guide shaft; 15. baffle; 16. mounting hole; 17. compression spring; 18. tread; 19. prefabricated bracket; 20. screw hole; 21. mounting seat; 51. retreat support groove; 52. limit support groove; 22. clearance surface; 23. second rotating shaft. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the various embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The embodiment of the utility model provides a trailer frame flip locking structure, such as Figures 1 to 7As shown, it includes an upper bracket 1, a lower bracket 2, a rotation center 3 and a locking assembly installed in the lower bracket 2, the lower bracket 2 is detachably installed at the rear of the car, the upper bracket 1 is rotatably connected to the lower bracket 2 through the rotation center 3, the trailer frame has a closed locking posture and a flipped and unfolded posture, and the locking assembly includes a locking shaft 4 that sequentially penetrates the upper bracket 1 and the lower bracket 2, the upper bracket 1 is provided with a special-shaped groove 5 for the locking shaft 4 to slide into and engage, the lower bracket 2 is provided with a sliding hole 6 for the locking shaft 4 to slide along the special-shaped groove 5, the locking shaft 4 is connected with a latch 7, one end of the latch 7 is connected with a control end 8, and the control end 8 is installed at one end of the lower bracket 2 away from the rear of the car;

[0033] When the trailer frame is in a closed locking position, the upper bracket 1 covers the lower bracket 2, and the locking shaft 4 is located at one end of the sliding hole 6 close to the rear of the vehicle and is clamped in the special-shaped groove 5;

[0034] When the trailer frame switches from the closed locking posture to the flipped and unfolded posture, the control end 8 drives the pin 7 away from the rear of the car, and the locking shaft 4 follows the pin 7 to slide in the sliding hole 6 until it reaches the notch of the special-shaped groove 5. The upper bracket 1 rotates along the rotation center 3 to move away from the lower bracket 2, and the pin 7 disengages from the special-shaped groove 5.

[0035] Specifically, in this embodiment, the lower bracket 2 is a single-arm structure and is tubular, forming a cavity 9 for installing the locking assembly.

[0036] The two ends of the locking shaft 4 are respectively located on both sides of the lower bracket 2, and the sliding hole 6 extends along the length direction of the lower bracket 2. The end of the sliding hole 6 close to the rotation center 3 is connected with a through hole 10, and the inner diameter of the through hole 10 is larger than the inner diameter of the sliding hole 6. When the locking shaft 4 slides from the end of the sliding hole 6 away from the rotation center 3 to the through hole 10 under the drive of the latch 7, it slides synchronously to the notch of the special-shaped groove 5. At this time, the user can control the upper bracket 1 to rotate counterclockwise along the rotation center 3, and the locking shaft 4 is separated from the special-shaped groove 5, so as to realize the unlocking between the upper bracket 1 and the lower bracket 2.

[0037] When the trailer frame switches from the flipped and unfolded posture to the closed and locked posture, the locking shaft 4 in the locking assembly moves to the end of the sliding hole 6 close to the rotation center 3, the upper bracket 1 rotates clockwise and covers the lower bracket 2, the locking shaft 4 is inserted into the notch of the special-shaped groove 5, and then the locking shaft 4 is pushed by the pin 7 to slide and engage toward the bottom of the special-shaped groove 5.

[0038] One end of the lower bracket 2 close to the rotation center 3 has a chamfer to allow the upper bracket 1 to rotate.

[0039] In a preferred embodiment of the present utility model, the control end 8 includes a rotating plate 81 and a pedal 82. A first rotating shaft 11 arranged in the same direction as the locking shaft 4 is provided on the side of the lower bracket 2 away from the upper bracket 1. The rotating plate 81 is rotatably connected to the first rotating shaft 11. The lower bracket 2 is provided with a clearance hole 12 for one end of the rotating plate 81 to extend into. The other end of the rotating plate 81 is connected to the latch 7. The pedal 82 is fixed to the end of the rotating plate 81 away from the lower bracket 2.

[0040] In a preferred embodiment of the present invention, a vertical waist-shaped hole 13 is formed at one end of the rotating plate 81 extending into the lower bracket 2 , and a guide shaft 14 is provided at one end of the latch 7 away from the locking shaft 4 , and the guide shaft 14 passes through the waist-shaped hole 13 .

[0041] Specifically, in the present embodiment, when the rotating plate 81 rotates counterclockwise along the first rotating shaft 11, one end of the rotating plate 81 connected to the latch 7 swings in a direction away from the rear of the automobile. At this time, the rotating plate 81 has a horizontal offset and a vertical offset, and the guide shaft 14 is passed through the vertical waist-shaped hole 13. Therefore, the horizontal offset of the rotating plate 81 can drive the guide shaft 14 to translate, thereby achieving the purpose of driving the latch 7 away from the rear of the automobile and driving the locking shaft 4 to move into the through hole 10.

[0042] In a preferred embodiment of the present utility model, a baffle 15 is fixed to the side of the lower bracket 2 away from the rear of the car, and the baffle 15 is provided with a mounting hole 16 for inserting the end of the latch 7 away from the locking shaft 4, and a compression spring 17 is sleeved on the latch 7, one end of the compression spring 17 is against the baffle 15, and the guide shaft 14 is located on the side of the compression spring 17 close to the locking shaft 4.

[0043] Specifically, in the present embodiment, when the trailer frame is in the closed locking posture, the user steps on the pedal 82 to rotate the rotating plate 81 counterclockwise, and the locking shaft 4 moves into the through hole 10. Then, the user flips the upper bracket 1 counterclockwise to switch the trailer frame to the flipped and deployed posture. Then, the user releases the pedal 82, and under the action of the compression spring 17, the latch 7 is pushed to move toward the rear of the car to achieve reset. When the trailer frame needs to switch from the flipped and deployed posture to the closed locking posture, the user steps on the pedal 82 to move the locking shaft 4 into the through hole 10. Then, the upper bracket 1 is flipped clockwise. When the upper bracket 1 is covered on the lower bracket 2, the locking shaft 4 is located in the special-shaped groove 5. Then, the user releases the pedal 82, and under the action of the compression spring 17, the latch 7 moves toward the direction close to the rear of the car, pushing the locking shaft 4 to be engaged with the bottom of the special-shaped groove 5.

[0044] In a preferred embodiment of the present invention, the foot pedal 82 has a tread surface 18 for the user to step on to control the rotation of the rotating plate 81, and the tread surface 18 is a horizontal surface.

[0045] Specifically, in the present embodiment, in actual use, the user steps on the horizontal tread 18 and slightly applies downward force to drive the rotating plate 81 to rotate counterclockwise, making it easier and more convenient for the user to unlock the trailer frame.

[0046] In a preferred embodiment of the present invention, a prefabricated bracket 19 is fixed to a side of the upper bracket 1 away from the lower bracket 2 , and the prefabricated bracket 19 is provided with a screw hole 20 for a pre-configured mounting seat 21 to be screwed and fixed.

[0047] Specifically, in this embodiment, the bicycle is installed on the mounting seat 21, and the mounting seat 21 and the prefabricated bracket 19 are detachably arranged. The user can select the corresponding mounting seat 21 according to the bicycle model, and then screw the selected mounting seat 21 to the prefabricated bracket 19, which has a high degree of freedom.

[0048] In a preferred embodiment of the present utility model, the special-shaped groove 5 is a configuration groove, which includes a retreat branch groove 51 and a limit branch groove 52 connected to the retreat branch groove 51. The retreat branch groove 51 has a notch for the locking shaft 4 to be inserted. The retreat branch groove 51 is vertically arranged, and a yielding surface 22 is arranged at the notch of the limit branch groove 52. The limit branch groove 52 is horizontally arranged. When the trailer frame is in a closed locking posture, the connecting part of the limit branch groove 52 and the retreat branch groove 51 is connected to the sliding hole 6.

[0049] Specifically, in this embodiment, by providing the clearance surface 22, the locking shaft 4 can enter the special-shaped groove 5 more easily, thereby improving the reliability of the locking assembly.

[0050] When the trailer frame is in the closed locking position, the through hole 10 connected to the sliding hole 6 is connected to the retreat branch groove 51 of the special-shaped groove 5, and the sliding hole 6 is connected to the limit branch groove 52. The compression spring 17 is in the reset state, and the locking shaft 4 is located at the end of the sliding hole 6 close to the rear of the car. At this time, the locking shaft 4 is located in the limit branch groove 52, and the upper bracket 1 cannot be lifted. After the user steps on the pedal 82, the locking shaft 4 slides into the through hole 10 under the drive of the latch 7 and is located at the connecting part between the limit branch groove 52 and the retreat branch groove 51. Then, the upper bracket 1 can be lifted to disengage the locking shaft 4 from the special-shaped groove 5.

[0051] In a preferred embodiment of the present invention, the rotation center 3 includes a second rotation shaft 23 , and the upper bracket 1 is rotationally connected to an end of the lower bracket 2 away from the rear of the vehicle via the second rotation shaft 23 .

[0052] In a preferred embodiment of the present invention, the second rotating shaft 23 is a bolt, and the upper bracket 1 is rotatably connected to the end of the lower bracket 2 away from the rear of the car through the bolt, and a margin is left between the upper bracket 1 and the lower bracket 2 for the upper bracket 1 to rotate around the bolt as the rotation center and deviate along the length direction of the bolt.

[0053] Specifically, in the present embodiment, compared with a smooth rotating shaft, when the upper bracket 1 is rotated, the bolt exerts a certain resistance on the upper bracket 1, and the upper bracket 1 can maintain the current rotation angle after rotating counterclockwise, thereby improving the user experience.

[0054] In summary, when the trailer frame is in the closed locking posture, the upper bracket 1 is covered by the lower bracket 2, and the locking assembly is installed in the lower bracket 2. During the driving process of the car, even if the road conditions are poor, there are splashing water or stones, it will not affect the locking assembly, which plays a role in protecting the locking assembly, reducing the wear of the locking assembly, and thus improving the durability of the locking assembly.

[0055] The upper bracket 1 is locked to the lower bracket 2 through the locking shaft 4, and the latch 7 is used to drive the locking shaft 4 to disengage from or be connected to the upper bracket 1, so that the latch 7 does not need to span the upper bracket 1, reducing the length of the latch 7. The lower bracket 2 is a single-arm structure, which makes the structure of the locking assembly more compact, reducing the space occupied by the trailer frame when installed at the rear of the car, thereby providing space for opening the trunk door.

[0056] When the user needs to switch the trailer frame from the closed locking posture to the flipped and unfolded posture, no tools are needed, and the user only needs to pull the latch 7 through the control end 8 and then flip the upper bracket 1. The operation is simple; when the user needs to switch the trailer frame from the flipped and unfolded posture to the closed locking posture, the upper bracket 1 is rotated in the opposite direction, and the latch 7 is driven by the control end 8. The latch 7 pushes the locking shaft 4 to move to the end of the sliding hole 6 away from the rear of the car, so that the upper bracket 1 covers the lower bracket 2, and the locking shaft 4 slides into the special-shaped groove 5. The compression spring 17 drives the latch 7 to move toward the rear of the car, and then pushes the locking shaft 4 to be clamped at the bottom of the special-shaped groove 5, so that the trailer frame is automatically locked. Even if the road is bumpy, the upper bracket 1 and the lower bracket 2 can still maintain a reliable lock.

Claims

1. A trailer frame flip locking structure, characterized in that: The trailer frame comprises an upper bracket (1), a lower bracket (2), a rotation center (3) and a locking assembly installed in the lower bracket (2); the lower bracket (2) is detachably installed at the rear of the vehicle; the upper bracket (1) is rotationally connected to the lower bracket (2) via the rotation center (3); the trailer frame has a closed locking posture and a flipped and unfolded posture; the locking assembly comprises a locking shaft (4) which is sequentially passed through the upper bracket (1) and the lower bracket (2); the upper bracket (1) is provided with a special-shaped groove (5) for the locking shaft (4) to slide into and engage; the lower bracket (2) is provided with a sliding hole (6) for the locking shaft (4) to slide along the special-shaped groove (5); the locking shaft (4) is connected with a latch (7); one end of the latch (7) is connected with a control end (8); the control end (8) is installed at an end of the lower bracket (2) away from the rear of the vehicle; When the trailer frame is in the closed locking position, the upper bracket (1) covers the lower bracket (2), and the locking shaft (4) is located at one end of the sliding hole (6) close to the rear of the vehicle and is clamped in the special-shaped groove (5); When the trailer frame switches from the closed locking posture to the flipped unfolding posture, the control end (8) drives the latch (7) away from the rear of the vehicle, the locking shaft (4) follows the latch (7) to slide in the sliding hole (6) until it reaches the notch of the special-shaped groove (5), the upper bracket (1) rotates along the rotation center (3) to move away from the lower bracket (2), and the latch (7) disengages from the special-shaped groove (5).

2. The trailer frame flip locking structure according to claim 1, characterized in that: The control end (8) comprises a rotating plate (81) and a pedal (82); a first rotating shaft (11) arranged in the same direction as the locking shaft (4) is arranged on a side of the lower bracket (2) away from the upper bracket (1); the rotating plate (81) is rotatably connected to the first rotating shaft (11); the lower bracket (2) is provided with a clearance hole (12) for one end of the rotating plate (81) to extend into; the other end of the rotating plate (81) is connected to the latch (7); and the pedal (82) is fixed to the end of the rotating plate (81) away from the lower bracket (2).

3. The trailer frame flip locking structure according to claim 2, characterized in that: A vertical waist-shaped hole (13) is formed at one end of the rotating plate (81) extending into the lower bracket (2), and a guide shaft (14) is provided at one end of the latch pin (7) away from the locking shaft (4), and the guide shaft (14) passes through the waist-shaped hole (13).

4. The trailer frame flip locking structure according to claim 3, characterized in that: A baffle (15) is fixed to a side of the lower bracket (2) away from the rear of the automobile, and the baffle (15) is provided with a mounting hole (16) for inserting an end of the latch (7) away from the locking shaft (4), and a compression spring (17) is sleeved on the latch (7), one end of the compression spring (17) abuts against the baffle (15), and the guide shaft (14) is located on a side of the compression spring (17) close to the locking shaft (4).

5. The trailer frame flip locking structure according to claim 2, characterized in that: The foot pedal (82) has a tread surface (18) for a user to step on to control the rotation of the rotating plate (81), and the tread surface (18) is a horizontal surface.

6. The trailer frame flip locking structure according to claim 1, characterized in that: A prefabricated bracket (19) is fixed to a side of the upper bracket (1) away from the lower bracket (2), and the prefabricated bracket (19) is provided with a screw hole (20) for screwing and fixing a pre-configured mounting seat (21).

7. The trailer frame flip locking structure according to claim 4, characterized in that: The special-shaped groove (5) is a configuration groove, and the configuration groove comprises a retreat branch groove (51) and a limit branch groove (52) connected to the retreat branch groove (51); the retreat branch groove (51) has a notch for the locking shaft (4) to be inserted into; the retreat branch groove (51) is vertically arranged, and a yielding surface (22) is arranged at the notch of the limit branch groove (52); the limit branch groove (52) is horizontally arranged; when the trailer frame is in the closed locking posture, the connection portion between the limit branch groove (52) and the retreat branch groove (51) is connected to the sliding hole (6).

8. The trailer frame flip locking structure according to claim 7, characterized in that: The rotation center (3) includes a second rotation shaft (23), and the upper bracket (1) is rotationally connected to an end of the lower bracket (2) away from the rear of the vehicle via the second rotation shaft (23).

9. The trailer frame flip locking structure according to claim 8, characterized in that: The second rotating shaft (23) is a bolt, and the upper bracket (1) is rotatably connected to the end of the lower bracket (2) away from the rear of the vehicle through the bolt, and a margin is left between the upper bracket (1) and the lower bracket (2) for the upper bracket (1) to rotate around the bolt as the rotation center and deviate along the length direction of the bolt.

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