CN209870448U

CN209870448U - Multifunctional trailer device

Info

Publication number: CN209870448U
Application number: CN201920728205.XU
Authority: CN
Inventors: 黄俊键
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2019-12-31
Anticipated expiration: 2029-05-17

Abstract

The utility model discloses a multifunctional trailer device, which comprises a front trailer plate and a rear trailer plate, wherein two sides of one end of the rear trailer plate are respectively provided with a slot, a connecting pin is arranged in the slot, two sides of one end of the front trailer plate are respectively provided with a bolt, and the bolts are positioned in the slots and can rotate on the connecting pins; the rear trailer plate is provided with a groove, the groove is internally provided with a foldable flexible glue box, the flexible glue box is foldable and retractable, when the flexible glue box is used for storing water or storing articles, the flexible glue box can be stretched and expanded to increase the capacity, and when the flexible glue box is not used, the flexible glue box is retractable to reduce the occupied space. The utility model provides a multi-functional trailer device, simple structure, convenient to use both has the function of carwash, can regard as shopping cart, storage tank to use again, still can carry the heavy thing of big piece, and the function is perfect abundant.

Description

Multifunctional trailer device

Technical Field

The utility model belongs to daily life articles for use field, concretely relates to multi-functional trailer device.

Background

When the car is washed at home, the traditional method is that the water bucket is carried by hand at home and the labor is very wasted when the car is stopped. And the limited transport of family's cask capacity is once not enough to satisfy the carwash water consumption, has to connect the back and forth operation of two and three, and manual car washing is slower than high-pressure squirt carwash efficiency in addition, and the high-pressure carwash product on the existing market can not satisfy the water storage capacity simultaneously enough, and the transport is light, has the swift carwash function of high water pressure again, leads to a lot of car owners to be suspiciously troublesome, and the crisp selection is at the outer consumption carwash. Furthermore, the parking place of the car in the town is often a parking lot near a community or a public underground parking garage and the like, the parking place of the car is away from the home or a shopping mall is away from the parking place by a certain distance, with the improvement of the economic level, the shopping habit of modern society people is often required by driving the car to the shopping mall for a large number of families at one time on the weekend or is often used for commercial use and transferring goods, in order to save physical strength, the car can only be driven to a destination, and after the goods are unloaded, the car has to be driven to a proper parking place. The traditional solution is to take the plastic bag to carry by hand or take the iron goods trailer from home to the parking spot to operate with great effort and time.

The rear of a vehicle box has messy articles, and a lot of people need to repeatedly put the articles neatly due to the motion of the vehicle body after the articles are neatly collected, so that the articles are collided to cause abnormal sounds in various vehicles, and the trouble is solved. Therefore, a lot of people buy the storage box in the vehicle, but the storage box is single in state and occupies space. When the space in the vehicle is required to carry large articles, the conventional storage box occupies the space in the vehicle.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model aims to provide a multifunctional trailer device, its simple structure, the simple operation both has the car cleaning function, has still designed foldable trailer and has conveniently carried, and it is convenient to use.

The utility model discloses the technical scheme who adopts does: a multifunctional trailer device comprises a front trailer plate and a rear trailer plate, wherein two sides of one end of the rear trailer plate are respectively provided with a slot, a connecting pin is arranged in the slot, two sides of one end of the front trailer plate are respectively provided with a bolt, and the bolts are positioned in the slots and can rotate on the connecting pins; the rear trailer plate is provided with a groove, and a foldable and telescopic soft rubber box is arranged in the groove.

When the flexible glue box is used, the flexible glue box can be unfolded, the front trailer plate is rotated to be perpendicular to the rear trailer plate, and the whole trailer device can be used as a shopping cart and can also be used as a storage box to be placed in a trunk; by unfolding the front trailer plate parallel to the rear trailer plate, large weights can be transported.

Optionally, the top of the soft rubber box is provided with a downward flange, the flange is located at one end close to the front trailer plate, a clamping groove corresponding to the flange is formed in one end, close to the rear trailer plate, of the front trailer plate, when the front trailer plate and the rear trailer plate are unfolded in parallel, the flange can be clamped in the clamping groove, and when the front trailer plate rotates to be perpendicular to the rear trailer plate, the flange can be buckled at the top of the front trailer plate. When large heavy objects are transported, the flange is buckled in the clamping groove, so that the parallel structure between the front trailer plate and the rear trailer plate is more stable; when the front trailer plate is used as a shopping cart, the flange is buckled at the top of the front trailer plate to fix the front trailer plate and prevent the front trailer plate from automatically rotating.

Optionally, the bottom of the front trailer plate is provided with a limiting groove, and two ends of the flange are provided with limiting blocks corresponding to the limiting groove.

Optionally, the bottom of the front trailer board is provided with a first mounting groove and a second mounting groove, a high-pressure water pump is arranged in the first mounting groove, a water guide hose, a water outlet connector and a power supply interface are arranged in the second mounting groove, one end of the water guide hose is connected with a water inlet of the high-pressure water pump, a water outlet of the high-pressure water pump is connected with the water outlet connector, and the power supply interface is connected with an input end of the high-pressure water pump. In the shopping cart form, the water outlet joint is connected with an external water spray gun to store water in the soft rubber box, one end of the water guide hose is pulled into the soft rubber box, the water in the soft rubber box is pumped out by the high-pressure water pump and is sprayed out at high pressure through the water outlet joint and the water spray gun, the automobile can be cleaned, and the whole device can move freely and is very convenient to use; the high-pressure water pump can be powered by a vehicle-mounted power supply, and the vehicle-mounted power supply is connected with the power supply interface.

Optionally, a charging power supply is further arranged in the first mounting groove, a charging interface is further arranged in the second mounting groove, the charging interface is connected with a power input end of the charging power supply, and a power output end of the charging power supply is connected with a power input end of the high-pressure water pump. The high-pressure water pump can also be powered by a charging power supply, and when the electric quantity is insufficient, the charging power supply is charged by the charging interface.

Optionally, a first cover plate is arranged at an opening of the first mounting groove and fixed through screws, a second cover plate is arranged at an opening of the second mounting groove and rotatably arranged at the bottom of the front trailer plate. The first sealing cover plate is arranged to protect the high-pressure water pump and the charging power supply, so that the integral structure is not attractive; the second cover sealing plate is arranged, so that the water guide hose, the water outlet connector, the power interface and the charging interface are protected, and the integral structure is not attractive.

Optionally, the one end of back trailer board still is equipped with the draw bar frame, and the draw bar frame includes parallel and fixed connection's first pull rod and second pull rod, and the one end of keeping away from preceding trailer board on the back trailer board is equipped with the major axis, is equipped with first groove and the second groove of stepping down along the major axis direction on the back trailer board in proper order, and the one end of first pull rod and the one end of second pull rod are located first groove and the second groove of stepping down respectively, and this end of first pull rod and this end of second pull rod all with major axis swing joint. The pull rod frame is arranged to facilitate the pulling and dragging.

Optionally, the first pull rod and the second pull rod are provided with clamping blocks capable of moving on the first pull rod and the second pull rod, and the rear trailer plate is provided with clamping grooves corresponding to the clamping blocks. When the pull rod frame rotates to be vertical to the horizontal plane, the clamping block can move downwards into the clamping groove to clamp the pull rod frame, so that the pull rod frame is prevented from rotating, and the pull rod frame is convenient to apply force when the trailer passes through steps. And a plurality of cushion blocks arranged in parallel are arranged in the clamping groove. The cushion block is arranged, so that the stress on the edge of the rear trailer plate is reduced, and the protection effect on the edge of the rear trailer plate is achieved.

Optionally, the first pull rod and the second pull rod are of telescopic structures, and a button for controlling the telescopic structure is arranged on the pull rod frame.

Optionally, a pair of triangular wheels and a pair of universal wheels, or a pair of triangular wheels and two pairs of universal wheels, or three pairs of universal wheels, or two pairs of universal wheels are arranged on the rear trailer plate, and a pair of triangular wheels are respectively arranged at two ends of the long shaft; and the front trailer plate is provided with a pair of universal wheels.

When a pair of triangular wheels and a pair of universal wheels are arranged, the triangular wheels are respectively positioned at two ends of the rear trailer plate so as to facilitate the trailer to cross steps, stairs and the like; when a pair of triangular wheels and two pairs of universal wheels are arranged, the triangular wheels are positioned at one end of the rear trailer plate, the two pairs of universal wheels are respectively positioned at the middle part and the other end of the rear trailer plate, and the universal wheels are arranged in the middle part to strengthen the supporting effect on the rear trailer plate; when three pairs of universal wheels are arranged, the universal wheels are respectively positioned at the two ends and the middle part of the rear trailer plate; when two pairs of universal wheels are arranged, the universal wheels are respectively positioned at two ends of the rear trailer plate.

Optionally, a containing groove is formed in the rear trailer plate, and the pull rod frame can be folded and contained in the containing groove; the accommodating groove comprises a first accommodating groove for accommodating the first pull rod and a second accommodating groove for accommodating the second pull rod, a cross rod is arranged between the first pull rod and the second pull rod, a pair of clamping blocks for clamping the cross rod is arranged between the first accommodating groove and the second accommodating groove, and the clamping blocks are made of elastic rubber materials.

Optionally, the opening part of the soft rubber box is provided with a detachable cover plate. The bottom of apron is equipped with the supporting shoe, and after the flexible glue case is folded to shrink, the supporting shoe contacted with the bottom of flexible glue case, plays the supporting role to the apron bears the heavy object.

The utility model has the advantages that:

(1) the utility model provides a multi-functional trailer device, simple structure, convenient to use both has the function of carwash, can regard as shopping cart, storage tank to use again, still can carry the heavy thing of big piece, and the function is perfect abundant.

(2) The flexible glue case is collapsible flexible, and when retaining or using as the storing, its expansion increase capacity of can stretching, when not using, then collapsible reduction occupation space.

(3) The utility model discloses in, high pressure water pump's rated operating voltage is provided by vehicle mounted power, avoids additionally carrying the power, also can be by the charging source power supply that its self carried.

(4) The clamping block and the clamping groove are designed, when the pull rod frame rotates to be vertical to the horizontal plane, the clamping block can move downwards into the clamping groove to clamp the pull rod frame, the rotation of the pull rod frame is avoided, and the pull rod frame is convenient to exert force when the trailer passes through steps.

(5) The cushion block is arranged, so that the stress on the edge of the rear trailer plate is reduced, and the protection effect on the edge of the rear trailer plate is achieved.

(6) The triangular wheels are designed to facilitate the trailer to cross obstacles such as steps, stairs and the like.

Drawings

Fig. 1 is a schematic view showing the structure of the multi-function trailer apparatus when the front trailer plate is unfolded to be parallel to the rear trailer plate.

Fig. 2 is a schematic view of the front trailer board of fig. 1 with the rear trailer board detached.

Fig. 3 is an enlarged view of the pin and slot of fig. 2.

Fig. 4 is an enlarged view of the pin and slot of fig. 1.

Figure 5 is a schematic view of the soft glue box open and the front trailer plate rotated to be perpendicular to the rear trailer plate.

Fig. 6 is an enlarged schematic view of the second mounting groove of fig. 5.

Figure 7 is a schematic view of the rear trailer plate with a pair of triangular wheels and two pairs of universal wheels.

Figure 8 is a schematic view of the rear trailer plate with three pairs of universal wheels.

Figure 9 is a schematic view of the rear trailer plate with two pairs of casters.

FIG. 10 is a schematic view of the pull rod holder after storage.

Fig. 11 is a disassembled schematic view of the pull rod frame.

FIG. 12 is a schematic view of another embodiment of the tie rod holder after detachment.

Fig. 13 is a schematic diagram of the soft capsule of fig. 5 after moving up a certain distance.

Figure 14 is a schematic view of the soft capsule of figure 13 from another perspective.

Fig. 15 is a bottom schematic view of the cover plate.

Fig. 16 is a bottom structural view of the rear trailer plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "front", "rear", "left", "right", "bottom", "side", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present embodiments.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 1, 2, 3 and 4, a multifunctional trailer device comprises a front trailer plate 10 and a rear trailer plate 20, wherein two sides of one end of the rear trailer plate are respectively provided with a slot 201, a connecting pin 202 is arranged in the slot, two sides of one end of the front trailer plate are respectively provided with a bolt 101, the bolts are positioned in the slots and connected with the connecting pins, and the bolts can rotate on the connecting pins; the rear trailer plate is provided with a groove, and a foldable flexible glue box 30 is arranged in the groove.

The top of soft gluey case is equipped with decurrent flange 301, and the flange is located the one end that is close to preceding trailer board, and the one end that is close to back trailer board on the preceding trailer board is equipped with the draw-in groove that corresponds with the flange, and when the trailer board was expanded with back trailer board parallel, the flange can block in the draw-in groove, and when the trailer board was rotatory to be as for back trailer board perpendicularly, the flange can be detained at the top of preceding trailer board. When large heavy objects are transported, the flange is buckled in the clamping groove, so that the parallel structure between the front trailer plate and the rear trailer plate is more stable; when used as a shopping cart, the flange snaps over the top of the front trailer plate, securing the front trailer plate against automatic rotation, as shown in FIG. 5.

The bottom of preceding trailer board is equipped with first mounting groove and second mounting groove, is equipped with high-pressure water pump in the first mounting groove, as shown in fig. 6, is equipped with water guide hose 103, water connectors 104, switch 108 and power source 105 in the second mounting groove, and the one end of water guide hose links to each other with high-pressure water pump's water inlet, and high-pressure water pump's delivery port links to each other with water connectors, and power source links to each other with high-pressure water pump's input. In the shopping cart form, the water outlet joint is connected with an external water spray gun to store water in the soft rubber box, one end of the water guide hose is pulled into the soft rubber box, the water in the soft rubber box is pumped out by the high-pressure water pump and is sprayed out at high pressure through the water outlet joint and the water spray gun, the automobile can be cleaned, and the whole device can move freely and is very convenient to use; the high-pressure water pump can be powered by a vehicle-mounted power supply, and the vehicle-mounted power supply is connected with the power supply interface.

Still be equipped with charging source in the first mounting groove, still be equipped with the interface that charges in the second mounting groove, the interface that charges links to each other with charging source's power input end, and charging source's power output end links to each other with high-pressure water pump's power input. The high-pressure water pump can also be powered by a charging power supply, and when the electric quantity is insufficient, the charging power supply is charged by the charging interface.

And a first cover plate 106 is arranged at an opening of the first mounting groove and fixed through screws, a second cover plate 107 is arranged at an opening of the second mounting groove, and the second cover plate is rotatably arranged at the bottom of the front trailer plate. The first sealing cover plate is arranged to protect the high-pressure water pump and the charging power supply, so that the integral structure is not attractive; the second cover sealing plate is arranged, so that the water guide hose, the water outlet connector, the power interface and the charging interface are protected, and the integral structure is not attractive.

The one end of back trailer board still is equipped with the draw bar frame, and the draw bar frame includes parallel and fixed connection's first pull rod 203 and second pull rod 204, and the one end of keeping away from preceding trailer board on the back trailer board is equipped with the major axis, is equipped with first groove 213 and the second groove 214 of stepping down along the major axis direction on the back trailer board in proper order, as shown in fig. 12, the one end of first pull rod and the one end of second pull rod are located first groove and the second groove of stepping down respectively, and this end of first pull rod and this end of second pull rod all with major axis swing joint. The pull rod frame is arranged to facilitate the pulling and dragging.

The first pull rod and the second pull rod are provided with clamping blocks 205 capable of moving on the first pull rod and the second pull rod, and the rear trailer plate is provided with clamping grooves 215 corresponding to the clamping blocks. When the pull rod frame rotates to be vertical to the horizontal plane, the clamping block can move downwards into the clamping groove to clamp the pull rod frame, so that the pull rod frame is prevented from rotating, and the pull rod frame is convenient to apply force when the trailer passes through steps. And a plurality of cushion blocks arranged in parallel are arranged in the clamping groove. The cushion block is arranged, so that the stress on the edge of the rear trailer plate is reduced, and the protection effect on the edge of the rear trailer plate is achieved.

Wherein, still be equipped with strip groove 216 on the back trailer board, flexible glue case one end is equipped with the protruding portion 303 that corresponds with the strip groove, and after the flexible glue case was accomodate to the back trailer board on, the protruding portion was detained in the strip groove.

The first pull rod and the second pull rod are of telescopic structures, and a button 208 for controlling the telescopic structure is arranged on the pull rod frame.

A pair of triangular wheels 206 and a pair of universal wheels 207 are arranged on the rear trailer plate, and the pair of triangular wheels are respectively arranged at two ends of the long shaft; and the front trailer plate is provided with a pair of universal wheels. Triangular wheels are arranged to facilitate the trailer to cross steps, stairs and the like.

Example 2:

this example is substantially the same as example 1, except that: as shown in fig. 7, a pair of triangular wheels 206 and two pairs of universal wheels 207 are provided on the rear trailer plate, the triangular wheels are located at one end of the rear trailer plate, the two pairs of universal wheels are respectively located at the middle part and the other end of the rear trailer plate, and the universal wheels are provided at the middle part to reinforce the supporting function of the rear trailer plate.

Example 3:

this example is substantially the same as example 2, except that: as shown in fig. 10 and 11, a receiving groove is formed on the rear trailer plate, and the pull rod frame can be folded and received in the receiving groove; the accommodating groove comprises a first accommodating groove 209 for accommodating a first pull rod and a second accommodating groove 210 for accommodating a second pull rod, a cross rod 211 is arranged between the first pull rod and the second pull rod, a pair of clamping blocks 212 for clamping the cross rod is arranged between the first accommodating groove and the second accommodating groove, and the clamping blocks are made of elastic rubber materials. The design of fixture block can make the pull rod frame accomodate more stably.

Example 4:

this example is substantially the same as example 1, except that: as shown in fig. 8, three pairs of universal wheels are provided on the rear trailer plate, or as shown in fig. 9, two pairs of universal wheels are provided on the rear trailer plate.

Example 5:

the present embodiment is basically the same as embodiment 1, and on this basis, a detachable cover plate 302 is arranged at the opening of the soft rubber box. As shown in fig. 15, the bottom of the cover plate is provided with a supporting block 302a, and after the flexible glue box is folded and contracted, the supporting block contacts with the bottom of the flexible glue box to support the cover plate, so that the cover plate bears a heavy object, and the cover plate is prevented from causing excessive pressure on the side wall of the flexible glue box, and further the side wall of the flexible glue box is prevented from deforming.

Example 6

The present embodiment is substantially the same as embodiment 5, and on the basis, as shown in fig. 13 and 14, a limiting groove 109 is provided on the bottom of the front trailer board, and limiting blocks 304 corresponding to the limiting groove are provided at both ends of the flange 301. Set up stopper 304 and spacing groove 109, when the flexible glue case expandes, preceding trailer board is rotatory to when perpendicular with back trailer board, and the top of trailer board in the front is detained to flange 301, and simultaneously, during the spacing groove was detained into to the stopper, the structure was more stable, avoided the flexible glue case to remove about.

Example 7

The present embodiment is substantially the same as embodiment 6, and on the basis of this, as shown in fig. 16, the bottom portions of the rear trailer plate and the front trailer plate are both provided with empty grooves, and support bars 40 are arranged in the empty grooves in a crossed manner. The bottom of back tow truck board and preceding tow truck board is equipped with the dead slot to alleviate the weight of whole trailer, set up the support bar in the dead slot, with the intensity of strengthening back tow truck board and preceding tow truck board.

The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims

1. A multi-functional trailer device which characterized in that: the trailer comprises a front trailer plate and a rear trailer plate, wherein two sides of one end of the rear trailer plate are respectively provided with a slot, a connecting pin is arranged in the slot, two sides of one end of the front trailer plate are respectively provided with a bolt, and the bolts are positioned in the slots and can rotate on the connecting pins; the rear trailer plate is provided with a groove, and a foldable and telescopic soft rubber box is arranged in the groove.

2. The multi-function trailer arrangement of claim 1, wherein: the top of flexible glue case is equipped with decurrent flange, and the flange is located the one end that is close to preceding trailer board, and the one end that is close to back trailer board on the preceding trailer board is equipped with the draw-in groove that corresponds with the flange, and when the trailer board was expanded with back trailer board parallel, the flange can block in the draw-in groove, and when the trailer board was rotatory to be as for back trailer board perpendicularly, the top at preceding trailer board can be detained to the flange.

3. The multi-function trailer arrangement of claim 2, wherein: the bottom of the front trailer plate is provided with a limiting groove, and two ends of the flange are provided with limiting blocks corresponding to the limiting groove.

4. The multi-function trailer arrangement of claim 1, wherein: the bottom of preceding trailer board is equipped with first mounting groove and second mounting groove, is equipped with high pressure water pump in the first mounting groove, is equipped with water guide hose, water connectors and power source in the second mounting groove, and water guide hose's one end links to each other with high pressure water pump's water inlet, and high pressure water pump's delivery port links to each other with water connectors, and power source links to each other with high pressure water pump's input.

5. The multi-function trailer arrangement of claim 4, wherein: still be equipped with charging source in the first mounting groove, still be equipped with the interface that charges in the second mounting groove, the interface that charges links to each other with charging source's power input end, and charging source's power output end links to each other with high-pressure water pump's power input.

6. The multi-function trailer arrangement of claim 4, wherein: the opening part of the first mounting groove is provided with a first cover plate, the first cover plate is fixed through screws, the opening part of the second mounting groove is provided with a second cover plate, and the second cover plate is rotatably arranged at the bottom of the front trailer plate.

7. The multi-function trailer arrangement of claim 1, wherein: the one end of back trailer board still is equipped with the draw bar frame, and the draw bar frame is including parallel and fixed connection's first pull rod and second pull rod, and the one end of keeping away from preceding trailer board on the back trailer board is equipped with the major axis, is equipped with first groove and the second groove of stepping down along the major axis direction in proper order on the back trailer board, and the one end of first pull rod and the one end of second pull rod are located first groove and the second groove of stepping down respectively, and this end of first pull rod and this end of second pull rod all with major axis swing joint.

8. The multi-function trailer arrangement of claim 7, wherein: clamping blocks capable of moving on the first pull rod and the second pull rod are arranged on the first pull rod and the second pull rod, a clamping groove corresponding to the clamping blocks is arranged on the rear trailer plate, and a plurality of cushion blocks arranged in parallel are arranged in the clamping groove; the first pull rod and the second pull rod are of telescopic structures, and the pull rod frame is provided with a key for controlling the telescopic structure.

9. The multi-function trailer arrangement of claim 7, wherein: the rear trailer plate is provided with a pair of triangular wheels and a pair of universal wheels, or a pair of triangular wheels and two pairs of universal wheels, or three pairs of universal wheels, or two pairs of universal wheels, and the pair of triangular wheels are respectively arranged at two ends of the long shaft; and the front trailer plate is provided with a pair of universal wheels.

10. The multi-function trailer arrangement of claim 7, wherein: the rear trailer plate is provided with a containing groove, and the pull rod frame can be folded and contained in the containing groove; the accommodating groove comprises a first accommodating groove for accommodating the first pull rod and a second accommodating groove for accommodating the second pull rod, a cross rod is arranged between the first pull rod and the second pull rod, a pair of clamping blocks for clamping the cross rod is arranged between the first accommodating groove and the second accommodating groove, and the clamping blocks are made of elastic rubber materials.