CN220562650U - Bicycle carrying rack at tail part of vehicle - Google Patents

Abstract

The utility model discloses a bicycle carrying hanger at the tail of a vehicle, which comprises a trailer hook connecting mechanism, a stand column and a bracket, wherein one end of the stand column is connected with the trailer hook connecting mechanism; the bracket is fixedly connected with a connecting sheet, the connecting sheet is provided with a first hinge hole and a first limit hole, and the first hinge hole is positioned between the bracket and the first limit hole on the connecting sheet; the other end of the upright post is provided with a second hinge hole matched with the first hinge hole and a second limit hole matched with the first limit hole; the connecting piece is characterized by further comprising a limiting piece, wherein the limiting piece detachably penetrates through a hole formed by combining the first limiting hole and the second limiting hole and is used for limiting the rotation of the connecting piece; the connecting block on the original upright post is omitted, so that the volume of the connecting part is reduced, the cost of the connecting block is saved, and the assembly is simpler and more convenient, thereby not only reducing wind resistance, but also reducing the production cost of equipment.

Description

Bicycle carrying rack at tail part of vehicle

Technical Field

The utility model relates to a vehicle-mounted bicycle hanging frame, in particular to a vehicle tail bicycle carrying hanging frame.

Background

The bicycle is hung on a bracket, and then the bracket is connected to the vehicle through a trailer hook of the vehicle for carrying.

In the prior art, a bracket of a bicycle carrying frame at the tail is connected with a trailer hook connecting mechanism through a stand column, and in order to reduce the volume of the bicycle carrying frame at the tail when the bicycle is not carried, the bracket is usually foldable and connected with the stand column, so that after the bicycle carrying frame is folded, the volume can be reduced, and the wind resistance of the bicycle during running can be reduced. But at present, a connecting mechanism formed by combining a connecting sheet and a connecting block is arranged between the bracket and the upright post, so that the connecting part of the bracket and the upright post has larger volume and high preparation cost.

Disclosure of Invention

The utility model mainly aims to provide a bicycle carrier with a bicycle tail, which has relatively small volume at the joint of a stand column and a bracket and relatively low preparation cost.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the bicycle carrying rack at the tail of the vehicle comprises a trailer hook connecting mechanism, a stand column and a bracket, wherein one end of the stand column is connected with the trailer hook connecting mechanism; the bracket is fixedly connected with a connecting sheet, a first hinge hole and a first limiting hole are formed in the connecting sheet, and the first hinge hole is positioned between the bracket and the first limiting hole on the connecting sheet; the other end of the upright post is provided with a second hinge hole matched with the first hinge hole and a second limit hole matched with the first limit hole; a hinge shaft is arranged in the combined hole of the first hinge hole and the second hinge hole and is used for connecting the sheet and the upright post in a rotating way;

the connecting piece is characterized by further comprising a limiting piece, wherein the limiting piece detachably penetrates through the hole formed by combining the first limiting hole and the second limiting hole and is used for limiting the rotation of the connecting piece.

Compared with the prior art, the utility model has the following beneficial effects:

in the utility model, the connecting piece is directly connected with the upright post, so that the connecting piece on the original upright post is omitted, the volume of the connecting part is reduced, the cost of the connecting piece is also omitted, and the assembly is simpler and more convenient, thereby not only reducing wind resistance, but also reducing the production cost of equipment.

Preferably, the connecting sheets are two, and the two connecting sheets are arranged in parallel; the other end of the upright post is positioned between the two connecting sheets; the connecting piece is of an arc-shaped structure, the width of the middle part of the arc is equal to the width of the two ends, and the outer edge of the connecting piece is provided with a flanging; the two connecting pieces are arranged, so that the connecting strength is good, meanwhile, the upright post is between the two connecting pieces, the rotation stability is good when the two connecting pieces are folded, the strength of the connecting pieces is good due to the structure and the arc-shaped structure with the wide middle and the narrow two ends, the connecting pieces are not easy to deform, the connecting strength of the hinged positions can be increased, and the use stability can be ensured by dispersing impulsive force when the connecting pieces are impacted.

Preferably, the device further comprises a limiting piece, wherein at least one fixing hole is formed in the limiting piece, a nut is arranged in the fixing hole, and the fixing hole limits the nut in the circumferential direction and the axial direction; the hinge shaft is a bolt, and the bolt passes through the combined hole of the first hinge hole and the second hinge hole and then is screwed with the nut; the nut is limited in the fixing hole after the limiting piece is arranged, so that the nut is not easy to lose in the installation and use process, and the use feeling of a user is improved.

Preferably, the number of the fixing holes is two; the limiting piece comprises a handle and a screw rod, one end of the screw rod is connected with the handle, the other end of the screw rod passes through the combined hole of the first limiting hole and the second limiting hole to be screwed with a nut in one fixing hole, and the handle can drive the screw rod to rotate, so that screwing or disconnecting of the screw rod and the nut is realized; the limiting piece is simple in structure and low in preparation cost, and when the limiting piece is used, the screw rod penetrates through the combined hole and then is screwed with the nut if the limiting piece is required to be limited, and the screw rod and the nut are unscrewed through the handle and then are pulled out of the combined hole if the limiting piece is required to be unlocked.

Preferably, the hole wall of the fixing hole is of a polygonal structure matched with the nut, and a limiting protrusion for limiting the nut in the fixing hole is arranged in the hole wall; after the setting, spacing piece structure is simpler like this, can direct injection moulding, and manufacturing cost is lower, and nut circumference and axial are all spacing for the stability of nut in the fixed orifices is better, thereby reduces the condition that the nut was lost in the use.

Preferably, an anti-lost rope is arranged between the handle and the hinge shaft, one end of the anti-lost rope is connected with the hinge shaft, and the other end of the anti-lost rope is sleeved on the handle; after the anti-lost rope is arranged, the screw rod can be hung by the anti-lost rope to prevent the screw rod from being lost when the screw rod is pulled out, and one end of the anti-lost rope is connected with the hinge shaft, so that the anti-lost rope does not need to be independently provided with a fixing mechanism, and the anti-lost rope is simpler in integral structure and simpler and more convenient to install.

Preferably, a plastic sheath for reducing the rotating friction force of the connecting sheet is arranged on the connecting sheet, and the plastic sheath is positioned between the connecting sheet and the upright post; after the plastic sheath is arranged, the friction between the connecting sheet and the upright post is avoided, the lubrication function is achieved, the rotation is smoother, the abrasion of the rotation part can be reduced, and the service life is prolonged.

Preferably, a bending structure is arranged in the middle of the upright post, and a bending bulge faces to the direction of the bracket; the support is reversely bent, so that the upright post has higher forward bending strength when being stressed, better elastic deformation capacity and better vibration of the support in the transportation process, and the impact force generated when being impacted is dispersed when the support is bent, so that the stability of the structural strength is ensured.

Preferably, the bracket is of a U-shaped structure, the middle part of the U-shaped structure is fixedly connected with the connecting sheet, and a plurality of bicycle wheel binding assemblies are arranged on the bracket; the bicycle wheels are conveniently and stably bound to the bracket, and one vehicle usually corresponds to two binding assemblies.

Preferably, the trailer hook connecting mechanism comprises a connecting arm connected with the trailer hook, and a hinge seat is arranged on the connecting arm; one end of the upright post is fixedly connected with a rotating seat, the rotating seat is rotationally connected with a hinging seat, a pedal is rotationally connected to the rotating seat, an avoidance hole is formed in the upright post, one end of the pedal penetrates through the avoidance hole and is positioned at one side far away from the connecting arm, and a pin shaft is arranged at the other end of the pedal; the hinge seat is provided with a limit groove matched with the pin shaft, and the pin shaft is matched with the limit groove to lock or unlock the rotation of the rotating seat and the hinge seat; the connecting arm is provided with a shell, and the shell covers the connecting arm, the hinging seat and the rotating seat; then set up the back like this, slewing mechanism between stand and the linking arm, simple structure, spare part is less, and manufacturing cost is lower, and stability in use is better, and after the shell sets up for slewing mechanism and locking mechanical system are difficult for being influenced by the foreign object in work, guarantee the stability that the mechanism used, also can prevent simultaneously in the use, the centre gripping to the user, guarantee the security that equipment used.

Drawings

FIG. 1 is an exploded view of the tail bike carrier of the present utility model;

FIG. 2 is a schematic view of the structure of the tail bicycle carrier of the present utility model;

FIG. 3 is an exploded view of the trailer hitch connection of the present utility model;

FIG. 4 is a schematic diagram of a trailer hitch connection of the present utility model;

FIG. 5 is an enlarged schematic view of the connecting piece of the present utility model;

FIG. 6 is an enlarged schematic view of the limiting plate of the present utility model;

fig. 7 is a schematic view of another direction of the limiting plate according to the present utility model.

In the figure: 1. a trailer hook connecting mechanism; 2. a column; 3. a bracket; 4. a connecting sheet; 5. a first hinge hole; 6. a first limiting hole; 7. a second hinge hole; 8. a second limiting hole; 9. a hinge shaft; 10. a limiting piece; 11. flanging; 12. a limiting piece; 13. a fixing hole; 14. a nut; 15. a handle; 16. a screw; 17. a limit protrusion; 18. rope loss prevention; 19. a plastic sheath; 20. a bending structure; 21. a bicycle wheel binding assembly; 22. a connecting arm; 23. a hinge base; 24. a rotating seat; 25. a foot pedal; 26. avoidance holes; 27. a pin shaft; 28. a limit groove; 29. a housing; 30. positioning holes; 31. and a bump.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

Example 1

The bicycle carrying rack at the tail of a vehicle comprises a trailer hook connecting mechanism 1, a stand column 2 and a bracket 3, wherein the stand column 2 is a straight square tube, the square tube has strong structural stability, can be subjected to larger impact force and is not easy to rotate, the bicycle is not easy to shake after being mounted, and the lower end of the stand column 2 is rotationally connected with the trailer hook connecting mechanism 1; the bracket 3 is welded into a U-shaped structure by three round pipes, three groups of bicycle wheel binding assemblies 21 are arranged on the two parallel round pipes, one group of bicycle wheel binding assemblies 21 comprises two oppositely arranged wheel binding assemblies, each wheel binding assembly comprises a wheel bracket and a binding belt, each wheel bracket is fixedly connected with the round pipe, one end of each binding belt is fixed on each wheel bracket, a clamping mechanism matched with each binding belt is arranged on each wheel bracket, a connecting piece 4 is welded on each transverse round pipe of the U-shaped bracket 3, as shown in fig. 5, a first hinge hole 5 and a first limiting hole 6 are arranged on each connecting piece 4, the first hinge holes 5 and the first limiting holes 6 are round holes, and the first hinge holes 5 are positioned at positions between the brackets 3 and the first limiting holes 6 on the connecting pieces 4, namely, the first hinge holes 5 are positioned at the middle positions of the connecting pieces 4, so that the brackets 3 can be unfolded and folded conveniently, and the expanded limiting positions are achieved; the upper end of the upright post 2 is provided with a second hinge hole 7 matched with the first hinge hole 5 and a second limit hole 8 matched with the first limit hole 6; the hinge shaft 9 passes through the combined hole of the first hinge hole 5 and the second hinge hole 7 and serves as a rotating shaft for the connecting piece 4 and the upright post 2 to rotate relatively.

The device further comprises a limiting piece 10, wherein the limiting piece 10 is a bolt, one end of the bolt passes through a hole formed by combining the first limiting hole 6 and the second limiting hole 8 and is further provided with a clamp spring to prevent the bolt from being separated in the use process, the connecting piece 4 is limited after the bolt is inserted and cannot rotate relative to the upright post 2, and the bracket 3 is in an unfolding state at the moment; if the bracket 3 needs to be folded, the clamp spring needs to be pulled out first, then the bolt is pulled out, and at the moment, the connecting sheet 4 can be rotated to enable the bracket 3 to be folded.

Example 2

As shown in fig. 1 and 2, the bracket 3 of this embodiment is a U-shaped structure formed by bending a whole round tube, the whole round tube is bent, the connection strength at the bending position is high, the production efficiency is high, the yield is high, the production cost of the bracket 3 is low, the middle part of the U-shaped structure is welded with two connecting pieces 4, and five groups of bicycle wheel binding assemblies 21 are arranged on the bracket 3, and the wheel binding assemblies are the same as those of the above embodiments; the bicycle wheels are conveniently and stably bound to the bracket 3, and typically one vehicle corresponds to two binding assemblies, one group of two binding assemblies. The two connecting sheets 4 are arranged in parallel, and the first hinge holes 5 and the first limiting holes 6 on the two connecting sheets 4 are respectively arranged on the same corresponding axis; the upper end of the upright post 2 is positioned between the two connecting sheets 4; the connecting piece 4 is of an arc-shaped structure, namely a waist-shaped structure, the width of the middle part of the arc is larger than that of the two ends of the arc, the outer edge of the connecting piece 4 is provided with the flanging 11, the flanging 11 can not only increase the strength of the connecting piece 4, but also prevent the outer edge from being cut by hands during use, and ensure the use safety, so that the connecting piece 4 can be directly punched and formed, and the production efficiency and the yield are both higher; one end of the connecting sheet 4, which is connected with the bracket 3, is provided with a round hole, after one end of the bracket 3 passes through the round hole, the connecting sheet 4 slides in the middle of the bracket 3 and is welded at the round hole, so that the strength of the connecting position is ensured, and the thickness of the single connecting sheet 4 can be reduced due to the arrangement of the two connecting sheets 4, so that the stamping forming is facilitated; the rotation stability of the two connecting pieces 4 during rotation and folding is also better.

The limiting piece 12 is positioned at one side of one connecting piece 4, as shown in fig. 6 and 7, two fixing holes 13 are formed in the limiting piece 12, nuts 14 are arranged in the fixing holes 13, the fixing holes 13 are step holes, the hole diameter of the hole of the fixing holes 13 near the connecting piece 4 is smaller than that of one end of the fixing holes 13, the hole wall of the big hole of the fixing holes 13 is of a polygonal structure matched with the nuts 14, the circumferential rotation of the nuts 14 can be limited, and limiting protrusions 17 for limiting the nuts 14 in the big holes of the fixing holes 13 are arranged in the hole wall of the big holes, so that the nuts 14 can be axially limited in the big holes of the fixing holes 13; the hinge shaft 9 is a bolt which passes through the combined hole of the first hinge hole 5 and the second hinge hole 7, passes through the small hole of the fixed hole 13 and then is screwed with the nut 14 in the large hole; the nut 14 is limited in the fixing hole 13, so that the nut 14 is not easy to lose in the process of installation and use, and the circumferential limitation can ensure that no other tool is needed for circumferentially limiting the nut 14 during installation and disassembly, so that the installation and the disassembly are simpler and more convenient, and the use experience of a user is improved; meanwhile, in order to position the limiting piece 12 on the connecting piece 4 during installation, a positioning hole 30 is formed in the connecting piece 4, a bump 31 matched with the positioning hole 30 for positioning is formed in one end, opposite to the connecting piece 4, of the limiting piece 12, and the bump 31 is inserted into the positioning hole 30 during installation, so that the position of the limiting piece 12 on the connecting piece 4 can be positioned, the alignment of a bolt and a nut 14 is facilitated, and the installation is facilitated.

As shown in fig. 1, the limiting member 10 includes a handle 15 and a screw 16, usually, one end of the screw 16 is fixedly connected with the handle 15, one end of the handle 15 and one end of the screw 16 can be subjected to insert molding, or a similar connection structure of the limiting piece 12 and the nut 14 can be adopted, the other end of the screw 16 passes through a combined hole of the first limiting hole 6 and the second limiting hole 8, passes through a small hole of the other fixing hole 13 and then is screwed with the nut 14 in the corresponding large hole, and screwing or disconnecting of the screw 16 and the nut 14 is realized by rotating the handle 15; when the folding bracket is used, if limiting is needed, the screw 16 passes through the combined hole and then is screwed with the nut 14, if unlocking is needed, the screw 16 and the nut 14 are unscrewed through the handle 15, and then the screw 16 is pulled out of the combined hole, so that the bracket 3 can be folded.

The anti-lost rope 18 is generally arranged between the handle 15 and the hinge shaft 9 and used for preventing the screw 16 from being pulled out from the combined hole and being placed in an appropriate place to cause the loss of the limiting piece 10, the anti-lost rope 18 is usually a plastic rope or a steel wire rope, two ends of the anti-lost rope 18 are of annular structures, one end of the anti-lost rope 18 is sleeved on the hinge shaft 9, the inner diameter of the annular sleeve is larger than the outer diameter of the screw 16 of the bolt but smaller than the outer diameter of the tail of the bolt, the other end of the anti-lost rope 18 is sleeved on the handle 15, the anti-lost rope 18 is simple in structure, a fixing mechanism is not required to be arranged independently to be connected with the hinge shaft 9 and the limiting piece 10, the overall structure is simple, and the installation is simple.

A plastic sheath 19 for reducing friction force when the connecting sheet 4 rotates is arranged at the position between the connecting sheet 4 and the upright post 2, the shape of the plastic sheath 19 is matched with that of the connecting sheet 4, and through holes corresponding to the first hinge holes 5 and the first limiting holes 6 one by one are arranged on the plastic sheath 19 and are used for passing through the hinge shaft 9 and the limiting piece 10; the side of plastic sheath 19 and stand 2 contact is last to be equipped with the indent, and this indent is used for reducing the area of contact of plastic sheath 19 and stand 2 to frictional force when reducing the rotation has also avoided the metal friction between connection piece 4 and the stand 2, has played lubricated effect, makes the rotation more smooth and easy, reduces the wearing and tearing of rotation department, increase of service life.

As shown in fig. 2, a bending structure 20 is arranged in the middle of the square tubular upright post 2, and the bending bulge faces the direction of the bracket 3; namely the concave part that support 3 was bent is towards the vehicle direction for support 3 has been articulated the bicycle back, and the stand 2 that support 3 atress is just the direction of being to stand 2 alignment, thereby improves the positive flexural strength of support 3, and stand 2 also possesses better elastic deformation ability, the vibration that the buffering bicycle that can be better produced in the transportation, and the impact force when having bent in addition has still dispersed the impact, guarantees the stability of stand 2 structural strength.

The trailer coupler connection mechanism 1 is generally divided into two types, one is directed to a ball-end trailer coupler in Europe style, and the other is directed to a square-tube trailer coupler in American style. As shown in fig. 3, the example is directed to a ball-end trailer hook, the trailer hook connecting mechanism 1 comprises a connecting arm 22 connected with the trailer hook, a hinge seat 23 is arranged on the connecting arm 22, the hinge seat 23 is composed of two parallel steel sheets, and the steel sheets are welded on the connecting arm 22; the lower end of the upright post 2 is fixedly connected with a rotating seat 24, the rotating seat 24 is also composed of two parallel steel sheets, the two parallel steel sheets are welded at the lower end of the upright post 2 through a circular tube, the two parallel steel sheets are also welded with the circular tube, the two steel sheets corresponding to the rotating seat 24 are positioned at the outer sides of the two steel sheets corresponding to the hinging seat 23, the four steel sheets are all arranged in parallel, and the rotating seat 24 is connected with rotation; as shown in figure 4, a foot pedal 25 is rotatably connected to a rotating seat 24, an avoidance hole 26 is formed in a stand column 2, one end of the foot pedal 25 passes through the avoidance hole 26 and is positioned at one side far away from a connecting arm 22, a pin shaft 27 is arranged at the other end of the foot pedal 25, a through hole matched with the pin shaft 27 is formed at the other end of the foot pedal 25, the foot pedal 25 can drive the pin shaft 27 to rotate around a pivot of the foot pedal 25, and an arc-shaped hole for limiting the active stroke of the pin shaft 27 is formed in the rotating seat 24, so that the pin shaft 27 is not easy to disengage from a limiting groove 28 or is not too far away from the stand column 2 in a limiting state in use, the foot pedal 25 is easier to be stepped on by a user, the use convenience is better, a reset spring is arranged on the rotating seat 24 for resetting after the pin shaft 27 rotates, one end of the reset spring is hung on the pin shaft 27, and the other end of the reset spring is hung on a connecting bolt; the hinge seat 23 is provided with a limit groove 28 matched with the pin shaft 27, the limit groove 28 is an open groove, the pin shaft 27 is matched with the limit groove 28 to lock the rotation of the rotary seat 24 and the hinge seat 23, and the pin shaft 27 is separated from the limit groove 28 to unlock; the hinge seat 23 is provided with an inclined plane on one side facing the pin shaft 27, so that the pin shaft 27 is conveniently guided into the limit groove 28; the connecting arm 22 is provided with the shell 29, the shell 29 coats the connecting arm 22, the hinging seat 23 and the rotating seat 24, the shell 29 is separated left and right, the shells on two sides are combined and then fixed through screws, the shell 29 can prevent foreign objects from contacting the connecting arm 22, the hinging seat 23 and the rotating seat 24, the rotation of the pin shaft 27 is not easily influenced by the foreign objects, the situation that unlocking or locking cannot be realized is prevented, meanwhile, the device can be prevented from being clamped to a user or a bystander or other objects in the rotation and unlocking process, and the use safety of the device is ensured.

When the device is used, the device is connected with the rear trailer hook through the connecting arm 22 of the trailer hook connecting mechanism 1, then the corresponding binding belt on the wheel binding assembly is opened, then the wheels of the bicycle are hung on the corresponding wheel support of the bracket 3, and the wheels are tightly bound by the binding belt; when the bicycle is required to be dismounted, the bicycle can be dismounted by opening the binding belt; when in no-load, the screw rod 16 and the corresponding nut 14 can be separated through the handle 15, the screw rod 16 is pulled out, the bracket 3 can be rotated downwards to be folded at the moment, and the bracket 3 and the upright post 2 are generally tightly tied through a binding belt for stability; if the upright post 2 needs to be laid down, only the pedal 25 needs to be stepped on by a foot, so that the other end of the pedal 25 is tilted, the driving pin shaft 27 is separated from the limiting groove 28, the upright post 2 can be rotated and laid down at the moment, and when the upright post 2 needs to be reset, the upright post 2 only needs to be rotated to the initial position, and at the moment, the pin shaft 27 returns to the limiting groove 28 again under the action of the inclined surface of the hinging seat 23 and the reset spring to lock the position of the upright post 2.

The foregoing is only illustrative of the preferred embodiments of the present utility model and, although the present utility model has been described in detail with reference to the foregoing embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model, and equivalents of the features may be substituted for elements thereof without departing from the true spirit and scope of the utility model.

Claims (10)

1. The bicycle carrying rack at the tail of the vehicle comprises a trailer hook connecting mechanism (1), a stand column (2) and a bracket (3), wherein one end of the stand column (2) is connected with the trailer hook connecting mechanism (1); the method is characterized in that: the bracket (3) is fixedly connected with a connecting sheet (4), the connecting sheet (4) is provided with a first hinge hole (5) and a first limit hole (6), and the first hinge hole (5) is positioned between the bracket (3) and the first limit hole (6) on the connecting sheet (4); the other end of the upright post (2) is provided with a second hinge hole (7) matched with the first hinge hole (5) and a second limit hole (8) matched with the first limit hole (6); a hinge shaft (9) is arranged in the combined hole of the first hinge hole (5) and the second hinge hole (7) and is used for connecting the sheet (4) and the upright post (2) in a rotating way;

the connecting piece is characterized by further comprising a limiting piece (10), wherein the limiting piece (10) detachably penetrates through a combined hole of the first limiting hole (6) and the second limiting hole (8) and is used for limiting rotation of the connecting piece (4).

2. A rear bicycle carrying rack as claimed in claim 1, wherein: the number of the connecting sheets (4) is two, and the two connecting sheets (4) are arranged in parallel; the other end of the upright post (2) is positioned between the two connecting sheets (4); the connecting piece (4) is of an arc-shaped structure, the width of the arc-shaped middle part is larger than that of the two ends, and the outer edge of the connecting piece (4) is provided with a flanging (11).

3. A rear bicycle carrying rack as claimed in claim 1, wherein: the device further comprises a limiting piece (12), wherein at least one fixing hole (13) is formed in the limiting piece (12), a nut (14) is arranged in the fixing hole (13), and the fixing hole (13) limits the nut (14) in the circumferential direction and the axial direction; the hinge shaft (9) is a bolt, and the bolt passes through a combined hole of the first hinge hole (5) and the second hinge hole (7) and then is screwed with the nut (14).

4. A rear bicycle carrying rack as claimed in claim 3, wherein: the number of the fixing holes (13) is two; the limiting piece (10) comprises a handle (15) and a screw rod (16), one end of the screw rod (16) is connected with the handle (15), the other end of the screw rod (16) penetrates through a combination hole of the first limiting hole (6) and the second limiting hole (8) to be screwed with a nut (14) in a fixing hole (13), and the handle (15) can drive the screw rod (16) to rotate, so that screwing or disconnecting of the screw rod (16) and the nut (14) is achieved.

5. A rear bicycle carrying rack as claimed in claim 3 or 4, wherein: the hole wall of the fixing hole (13) is of a polygonal structure matched with the nut (14), and a limiting protrusion (17) for limiting the nut (14) in the fixing hole (13) is arranged in the hole wall.

6. The rear bicycle carrying rack of claim 4, wherein: an anti-lost rope (18) is arranged between the handle (15) and the hinge shaft (9), one end of the anti-lost rope (18) is connected with the hinge shaft (9), and the other end of the anti-lost rope (18) is sleeved on the handle (15).

7. A rear bicycle carrying rack as claimed in claim 1, wherein: the connecting piece (4) is provided with a plastic sheath (19) for reducing the rotating friction force of the connecting piece (4), and the plastic sheath (19) is positioned between the connecting piece (4) and the upright post (2).

8. A rear bicycle carrying rack as claimed in claim 1, wherein: the middle part of stand (2) is equipped with bending structure (20), and the protruding orientation support (3) direction of bending.

9. A rear bicycle carrying rack as claimed in claim 1, wherein: the support (3) is of a U-shaped structure, the middle of the U-shaped structure is fixedly connected with the connecting sheet (4), and a plurality of bicycle wheel binding assemblies (21) are arranged on the support (3).

10. A rear bicycle carrying rack as claimed in claim 1, wherein: the trailer hook connecting mechanism (1) comprises a connecting arm (22) connected with the trailer hook, and a hinging seat (23) is arranged on the connecting arm (22); one end of the upright post (2) is fixedly connected with a rotating seat (24), the rotating seat (24) is rotationally connected with a hinging seat (23), a pedal plate (25) is rotationally connected to the rotating seat (24), an avoidance hole (26) is formed in the upright post (2), one end of the pedal plate (25) penetrates through the avoidance hole (26) and is positioned at one side far away from the connecting arm (22), and a pin shaft (27) is arranged at the other end of the pedal plate (25); a limiting groove (28) matched with the pin shaft (27) is formed in the hinging seat (23), and the pin shaft (27) is matched with the limiting groove (28) to lock or unlock the rotation of the rotating seat (24) and the hinging seat (23); the connecting arm (22) is provided with a shell (29), and the shell (29) covers the connecting arm (22), the hinging seat (23) and the rotating seat (24).