Portable folding trailer

Abstract

The utility model discloses a portable folding trailer which comprises a trailer frame, and the trailer frame comprises a folding frame. The folding frame comprises two first shear-type mechanisms and two second shear-type mechanisms, each first shear-type mechanism is provided with at least two first shear-type units, and each second shear-type mechanism is provided with at least one second shear-type unit; the two first shear type mechanisms and the two second shear type mechanisms are connected to define a rectangular structure. A second upper seat and a second lower seat are further arranged in the middle of the first shear type mechanism, the second upper seat is provided with two upper pivot positions, and the two upper pivot positions are spaced front and back and aligned left and right; the upper portion of a connecting rod of every two adjacent first shear type units is arranged in a bent mode, the upper ends of every two adjacent first shear type units are pivoted to the two upper pivot positions of the second upper base respectively, and the lower ends of every two adjacent first shear type units are pivoted to the two lower pivot positions of the second lower base respectively. The trailer frame has the advantages that the width of the second upper seat is reduced, and the internal space width of the trailer frame is increased; and secondly, the connecting rod is connected to different pivoting positions of the second upper seat and the lower seat, so that the connecting strength is better.

Description

Technical Field

[0001] The utility model relates to a portable trailer, in particular to a portable folding trailer. Background Art

[0002] An existing portable folding trailer, such as CN108725533A, comprises a trailer frame, which comprises a folding frame and a wheel mechanism that can be mounted on the folding frame; the folding frame comprises two first scissor-type mechanisms arranged at intervals on the left and right and two second scissor-type mechanisms arranged at intervals on the front and back, the first scissor-type mechanism is provided with two first scissor-type units, and the second scissor-type mechanism is provided with a second scissor-type unit; the two first scissor-type mechanisms and the two second scissor-type mechanisms are connected to form a rectangular structure, the upper ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first upper seat, and the lower ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first lower seat; the upper ends of the connecting rods of the two adjacent first scissor-type units of the first scissor-type mechanism are arranged on the left and right and are connected together through a pivot, and the pivot axes of the upper ends of the two connecting rods are located on the same axis, and the above connection makes the width of the upper seat at least greater than the sum of the outer diameters of the two connecting rods. The large width of the upper seat leads to a narrow width of the space inside the trailer, so there is a need for further improvement. Utility Model Content

[0003] The utility model provides a portable folding trailer, which overcomes the shortcomings of the portable folding trailer in the background technology.

[0004] The utility model solves the technical problem by adopting the following technical scheme: a portable folding trailer comprises a trailer frame, the trailer frame comprises a folding frame and a wheel mechanism that can be mounted on the folding frame; the folding frame comprises two first scissor-type mechanisms arranged at intervals from left to right and two second scissor-type mechanisms arranged at intervals from front to back, the first scissor-type mechanism is provided with at least two first scissor-type units, and the second scissor-type mechanism is provided with at least one second scissor-type unit; the two first scissor-type mechanisms and the two second scissor-type mechanisms are connected to form a rectangular structure, the upper ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first upper seat, and the lower ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first lower seat; a second upper seat and a second lower seat are also provided in the middle of the first scissor-type mechanism, the second upper seat is provided with two upper pivots, the two upper pivots are spaced front to back and aligned left to right, the second lower seat is provided with two lower pivots, the upper part of a connecting rod is bent in the adjacent two first scissor-type units, and the upper ends of the adjacent two first scissor-type units are respectively pivotally connected to the two upper pivots of the second upper seat, and the lower ends are respectively pivotally connected to the two lower pivots of the second lower seat.

[0005] In one embodiment, a first telescopic rod group is connected between the corresponding first upper seat and the first lower seat, and a second telescopic rod group is connected between the corresponding second upper seat and the second lower seat.

[0006] In one embodiment, the second lower seat is provided with two lower pivots spaced apart front to back and staggered left to right.

[0007] In one embodiment: the first scissor-type unit and the second scissor-type unit both include two connecting rods rotatably connected together in the middle, the two connecting rods of the first scissor-type units are arranged crosswise inside and outside, and in two adjacent first scissor-type units: the upper part of the connecting rod located on the inner side of one first scissor-type unit is bent outward and rotatably connected to an upper pivot position of the second upper seat, and the upper part of the connecting rod located on the outer side of the other first scissor-type unit is rotatably connected to another upper pivot position of the second upper seat.

[0008] In one embodiment, the folding frame also includes a base frame, which includes a radiating mechanism whose number is equal to the first scissor-type unit of the first scissor-type mechanism and is arranged in the front-to-back direction, and the radiating mechanism includes a middle seat and four bottom rods rotatably connected to the middle seat, the ends of two bottom rods are respectively rotatably connected to two first lower seats, and the ends of the other two bottom rods are respectively rotatably connected to two second lower seats.

[0009] In one embodiment, the wheel mechanism is located below the first lower seat, and the wheel mechanism can be detachably connected to the folding frame.

[0010] In one embodiment: the wheel mechanism comprises a U-shaped wheel frame, a wheel and a first connecting shaft, the U-shaped wheel frame has a common plate and two split plates respectively connected to both sides of the common plate, the wheel is rotatably connected between the two split plates, the first connecting shaft is mounted on the common plate, and the first connecting shaft can be detachably mounted on the folding frame;

[0011] A first annular groove is recessed on the upper portion of the first connecting shaft; the first telescopic rod group includes an outer tube and an inner tube slidably arranged in the outer tube, the first lower seat is fixedly arranged at the bottom of the outer tube, and the top of the inner tube and the first upper seat are fixedly arranged together; a mounting component is also fixedly arranged at the bottom of the outer tube, and the mounting component is provided with a horizontally arranged slide groove, and an outer through hole penetrating inside and outside is provided in the area of ​​the outer tube corresponding to the slide groove, and a fixed sleeve is also fixedly arranged in the bottom of the outer tube, and the fixed sleeve is provided with an inner through hole corresponding to the outer through hole; the first connecting shaft is adapted to be inserted into the fixed sleeve, and the slide groove of the mounting component is also slidably connected with a slide seat that can slide horizontally, and the slide seat is provided with a first insertion portion, and the first insertion portion extends into the outer through hole, the inner through hole and is inserted into the first annular groove.

[0012] In one embodiment: the slide seat includes a first side plate and a second side plate that are relatively fixed and horizontally spaced apart, the first side plate being located outside a first side of the outer tube having an outer through hole, the first side plate being fixed with the above-mentioned first insertion portion, the second side plate being located outside a second side of the outer tube that is opposite to the first side, and an elastic body being arranged between the second side plate and the outer tube.

[0013] In one embodiment: the slide seat includes a rectangular frame, and the two side plates facing the rectangular frame constitute the above-mentioned first side plate and second side plate, and the outer tube is located inside the rectangular frame; the mounting component includes a lower mounting part and an upper mounting part, and the upper and lower mounting parts constitute the above-mentioned slide groove.

[0014] In one embodiment: the wheel mechanism includes a support frame and two wheels rotatably connected to both sides of the support frame; the first telescopic rod group includes an outer tube and an inner tube slidably arranged in the outer tube, the first lower seat is fixedly arranged at the bottom of the outer tube, the top of the inner tube and the first upper seat are fixedly arranged together, and the bottom of the outer tube is fixedly provided with a second connecting shaft; the support frame and the second connecting shaft can be detachably connected together;

[0015] A second annular groove is recessed at the lower portion of the second connecting shaft; an insertion hole is recessed at the support frame, and a first through hole is provided on the support frame that penetrates inside and outside the insertion hole, and the second connecting shaft is adapted to be inserted into the insertion hole. The wheel mechanism also includes an L-shaped frame, and the middle portion of the L-shaped frame is rotatably connected to the bottom of the support frame. An elastic body is provided between one end of the L-shaped frame and the support frame, and a second insertion portion is fixedly provided at the other end, and the second insertion portion extends into the first through hole and is inserted into the second annular groove.

[0016] Compared with the background technology, this technical solution has the following advantages:

[0017] The second upper seat is provided with two upper pivots, which are spaced front to back and aligned left to right, and the second lower seat is provided with two lower pivots. The upper part of a connecting rod in two adjacent first scissor-type units is bent and arranged, and the upper ends of the two adjacent first scissor-type units are respectively pivoted to the two upper pivots of the second upper seat, and the lower ends are respectively pivoted to the two lower pivots of the second lower seat. Then: first, the width of the second upper seat is reduced, and the width of the internal space of the trailer frame is increased; second, the connecting rod is connected to different pivot positions of the second upper seat and the lower seat, and the connection strength is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Figure 1 It is a three-dimensional schematic diagram of the trailer of the first embodiment.

[0020] Figure 2 It is a three-dimensional schematic diagram of the trailer frame of the first embodiment in an open state.

[0021] Figure 3 It is a three-dimensional schematic diagram of the trailer frame of the first embodiment being half retracted.

[0022] Figure 4 It is a three-dimensional schematic diagram of the first embodiment, in which the trailer frame is in a folded state and the pull rod mechanism is opened.

[0023] Figure 5 It is a three-dimensional schematic diagram of the first embodiment in which the trailer frame is in a folded state and the pull rod mechanism is half-folded.

[0024] Figure 6 It is a three-dimensional schematic diagram of the first embodiment in which the trailer frame is in a folded state and the pull rod mechanism is folded.

[0025] Figure 7 It is a three-dimensional schematic diagram of the first embodiment in which the trailer frame is in a folded state and the wheel mechanism is disassembled.

[0026] Figure 8 It is a three-dimensional schematic diagram of the wheel mechanism of the trailer frame in the first embodiment in an exploded state.

[0027] Fig. 9 It is a schematic front view of the wheel mechanism of the trailer frame of the first embodiment.

[0028] Fig.10 yes Fig. 9 Partial schematic diagram of the AA section.

[0029] Fig.11 yes Figure 8 A partial enlarged schematic diagram of .

[0030] Fig.12 yes Fig.10 An enlarged schematic diagram of point B.

[0031] Fig.13 yes Fig. 9 Partial schematic diagram of CC section.

[0032] Fig.14 It is a three-dimensional schematic diagram of the trailer frame of the second embodiment in an open state.

[0033] Fig.15 It is a three-dimensional schematic diagram of the trailer frame of the third embodiment in an open state.

[0034] Fig.16 It is a three-dimensional schematic diagram of the trailer frame of the third embodiment in a folded state.

[0035] Fig.17 It is a three-dimensional schematic diagram of the trailer frame of the third embodiment in a folded state with the wheel mechanism disassembled.

[0036] Fig.18 It is a three-dimensional schematic diagram of the wheel mechanism of the trailer frame of the third embodiment in an exploded state.

[0037] Fig.19 yes Fig.18 A partial enlarged schematic diagram of .

[0038] Fig. 20 It is one of the partially enlarged schematic diagrams of the wheel mechanism of the trailer frame of the third embodiment.

[0039] Fig.21This is the second partially enlarged schematic diagram of the wheel mechanism of the trailer frame of the third embodiment.

[0040] Fig. 22 It is a three-dimensional schematic diagram of the trailer frame of the fourth embodiment in an open state.

[0041] Description of labels:

[0042] Trailer frame 100, car cloth 200, folding frame 10; first scissor mechanism 11, first scissor unit 111, connecting rod 112; second scissor mechanism 12, second scissor unit 121; first upper seat 131, first lower seat 132, first telescopic rod group 133, outer tube 1331, inner tube 1332; second upper seat 141, second lower seat 142, second telescopic rod group 143, upper pivot 1411, lower pivot 1421; radiation mechanism 15, middle seat 151, bottom rod 152; wheel mechanism 20, U-shaped wheel frame 21, wheel 22, first connecting shaft 23, first annular groove 231, slide groove 24, outer through hole 25, fixed sleeve 26, inner through hole 27, slide seat 28, first insertion part 281, first side plate 282, second side plate 283, first elastic body 284, lower mounting part 291, upper mounting part 292; first pull rod mechanism 30, first assembly seat 31, first pull rod 32, first gripping rod 33. Middle seat 122. Support frame 201, second connecting shaft 202, insertion hole 203, first through hole 204, second annular groove 205, L-shaped frame 206, second elastic body 207, second inserting part 208. DETAILED DESCRIPTION

[0043] Embodiment 1

[0044] Please refer to Figures 1 to 13 The portable folding trailer comprises a trailer frame 100 and a trailer cloth 200; the trailer frame 100 comprises a folding frame 10 and a wheel mechanism 20 which can be mounted on the folding frame 10.

[0045] The folding frame 10 includes two first scissor-type mechanisms 11 arranged at intervals from left to right and two second scissor-type mechanisms 12 arranged at intervals from front to back, the first scissor-type mechanism is provided with two first scissor-type units 111, and the second scissor-type mechanism 12 is provided with a second scissor-type unit 121; the two first scissor-type mechanisms 11 and the two second scissor-type mechanisms 12 are connected to form a rectangular structure, the upper ends of the adjacent first scissor-type units 111 and the second scissor-type units 121 are rotatably connected together through a first upper seat 131, and the lower ends of the adjacent first scissor-type units 111 and the second scissor-type units 121 are rotatably connected together through a first lower seat 132, and a first telescopic rod group 133 is connected between the corresponding first upper seat 131 and the first lower seat 132; the first scissor-type mechanism 11 A second upper seat 141 and a second lower seat 142 are also provided in the middle part, and a second telescopic rod group 143 is connected between the corresponding second upper seat 141 and the second lower seat 142. The second upper seat 141 is provided with two upper pivots 1411, and the two upper pivots 1411 are spaced front to back and aligned left to right. The second lower seat 142 is provided with two lower pivots 1421, and the two lower pivots 151 are spaced front to back and staggered left to right. The upper part of a connecting rod 112 in two adjacent first scissor-type units 111 is bent and arranged, and the upper ends of the two adjacent first scissor-type units 111 are respectively pivoted to the two upper pivots 1411 of the second upper seat 141, and the lower ends are respectively pivoted to the two lower pivots 1421 of the second lower seat; the upper part of the connecting rod 112 is bent so that the connecting rod 112 has a Z-shaped structure. The first scissor-type unit 111 and the second scissor-type unit 121 both include two connecting rods rotatably connected together in the middle. The two connecting rods of the first scissor-type unit are arranged crosswise inside and outside and in the two adjacent first scissor-type units 111: the upper part of the connecting rod 112 located on the inner side of one first scissor-type unit 111 is bent outwardly and rotatably connected to an upper pivot position 1411 of the second upper seat 141, and the upper part of the connecting rod located on the outer side of the other first scissor-type unit 111 is rotatably connected to another upper pivot position 1411 of the second upper seat 141, so that the width of the second upper seat of the trailer frame is smaller and corresponds to the outer position of the two connecting rods of the first scissor-type unit arranged crosswise inside and outside, thereby increasing the width of the internal space of the trailer frame and increasing the internal space of the trailer frame.

[0046] The folding frame 10 also includes a base frame, which includes a radiating mechanism 15 whose number is equal to the first scissor-type units 111 of the first scissor-type mechanism 11 and is arranged in the front-to-back direction. The radiating mechanism 15 includes a middle seat 151 and four bottom rods 152 that can be rotatably connected to the middle seat 151. The ends of the two bottom rods 152 located on the outside are respectively rotatably connected to the two first lower seats 132, and the ends of the other two bottom rods 152 are respectively rotatably connected to the two second lower seats 142, so that the entire base frame can be folded or unfolded with the folding frame, and the middle seat 151 is provided with a limiting mechanism so that the bottom rods 152 are at the maximum opening angle when in the unfolded state to improve stability. If the opening of the pivot groove provided on the middle seat faces downward, a top abutment is provided at the bottom of the pivot groove or the outer end of the pivot groove to achieve limiting.

[0047] The wheel mechanism 20 is located below the first lower seat 132 and can be detachably connected to the folding frame 10, so that the wheel mechanism 20 can be disassembled and occupies little space after being folded, which is convenient for storage and transportation.

[0048] The wheel mechanism 20 includes a U-shaped wheel frame 21, a wheel 22 and a first connecting shaft 23. The U-shaped wheel frame 21 has a common plate and two split plates respectively fixed on both sides of the common plate. The wheel 22 can be rotatably connected between the two split plates of the U-shaped wheel frame 21 through a pivot. The first connecting shaft 23 is vertically fixed to the common plate of the U-shaped wheel frame 21. The first connecting shaft 23 can be assembled and disassembled on the folding frame 10. In the specific structure: the first telescopic rod group 133 includes an outer tube 1331 and an inner tube 1332 slidably arranged in the outer tube 1331. The first lower seat 132 is fixed outside the bottom of the outer tube 1331, and the top of the inner tube 1332 and the first upper seat 131 are fixed together; the bottom of the outer tube 1331 is also fixed with a mounting component, and the mounting component is provided with a horizontally arranged slide groove 24, and the area of ​​the outer tube 1331 corresponding to the slide groove 24 is provided with an outer through hole 25 that penetrates inside and outside. A fixed sleeve 26 is also fixedly inserted from bottom to top, and the fixed sleeve 26 is provided with an inner through hole 27 corresponding to the outer through hole 25 (a convex ring is convexly provided on the lower periphery of the fixed sleeve 26 as needed, and when the convex ring abuts against the bottom of the outer tube 1331, the inner and outer through holes are aligned, such as the axis is aligned, or / and the periphery of the hole is aligned); a first annular groove 231 is recessed on the outer peripheral wall of the upper part of the first connecting shaft 23; the first connecting shaft 23 is adapted to be inserted into the fixed sleeve 26, and the first annular groove 231 is aligned with the inner through hole 27. The sliding groove 24 of the mounting component is also slidably connected with a sliding seat 28 that can slide horizontally, and the sliding seat 28 is provided with a first insertion portion 281, and the first insertion portion 281 extends into the outer through hole 25, the inner through hole 27 and is inserted into the first annular groove 231, so that the wheel mechanism 20 and the first telescopic rod group 133 are axially and axially locked, and the wheel mechanism 20 and the folding frame 10 can be assembled and disassembled, which is convenient for assembly and disassembly, and the connection is firm, stable and reliable.

[0049] In this embodiment: the slide seat 28 includes a first side plate 282 and a second side plate 283 that are relatively fixed and horizontally spaced apart. The first side plate 282 is located outside the first side of the outer tube 1331 where the outer through hole 25 is provided. The first side plate 282 is fixed with the above-mentioned first insertion portion 281. The second side plate 283 is located outside the second side of the outer tube 1331 that is opposite to the first side. A first elastic body 284 is provided between the second side plate 283 and the outer tube 1331, so that the elastic body stores energy when pressed, and the first insertion portion is separated from the first annular groove. When the pressure is released, the elastic body releases energy to extend into the fixed sleeve 26, so that it can be inserted into the first annular groove, thereby realizing automatic locking and improving the convenience of locking. Preferably, the slide seat 28 includes a rectangular frame, and the two side plates facing the rectangular frame constitute the above-mentioned first side plate and second side plate. The outer tube is located inside the rectangular frame, and the structure is firm and easy to operate; the mounting component includes a lower mounting portion 291 and an upper mounting portion 292, and the above-mentioned slide groove 24 is formed between the upper and lower mounting portions, which is easy to produce and assemble.

[0050] As needed, the trailer frame 100 also includes a first pull rod mechanism 30, which includes a first assembly seat 31, two first pull rods 32 that can be rotatably connected to the first assembly seat 31, and a first gripping rod 33 attached to the first assembly seat 31, the first gripping rod and the first pull rod are respectively located on both sides of the first assembly seat; the two first pull rods 32 are respectively rotatably connected to the two first lower seats 132 located on the second scissor-type mechanism 12, so that when the trailer frame 100 is folded or unfolded, the two first pull rods 32 are correspondingly abutted or opened; the first gripping rod 33 can be swingably connected to the first assembly seat 31 and is provided with a locking mechanism, so that the first gripping rod can swing relatively between the first position and the second position, when located in the first position, the first gripping rod and the first pull rod are respectively located on both sides of the first assembly seat, the locking mechanism is locked to maintain the first position, the locking mechanism is released to rotate the first gripping rod to be located in the second position, and the first gripping rod and the first pull rod are abutted together.

[0051] The sewing cloth 200 includes a base cloth and a peripheral wall extending upward from the periphery of the base cloth, the upper periphery of the peripheral wall is connected to the first upper seat 131 and the second upper seat 141 , and the base cloth is connected to the central seat 151 , the first lower seat 132 , and the second lower seat 142 .

[0052] Embodiment 2

[0053] Please refer to Fig.14 , a portable folding trailer, which is different from the first embodiment in that: one of the two second scissor-type mechanisms 12 has two connecting rods that are rotatably connected together through a middle seat 122, and the middle seat 122 is provided with two central joints, and the first pull rods 32 of the first pull rod mechanism 30 are respectively rotatably connected to the two central joints, and at this time, the two first pull rods are close to each other; according to needs, only one first pull rod can be provided, and the first assembly seat can also be fixedly connected to the first pull rod.

[0054] Embodiment 3

[0055] Please refer to Figures 15 to 21 , a portable folding trailer, which differs from the first embodiment in that: the wheel mechanism 20 includes a support frame 201 and two wheels 22 that can be rotatably connected to the two sides of the support frame 201; a second connecting shaft 202 is fixedly provided at the bottom of the outer tube 1331, and the support frame 201 and the second connecting shaft 202 can be assembled and detachably connected together. In the specific structure: the support frame 201 is recessed with an insertion hole 203, and the support frame 201 is provided with a first through hole 204 that penetrates inside and outside the insertion hole 203; a second annular groove 205 is recessed at the lower part of the second connecting shaft 202, and the second connecting shaft 202 is adapted to be inserted into the insertion hole 203. The wheel mechanism 20 also includes an L-shaped frame 206, the middle part of which is rotatably connected to the bottom of the support frame 201, and a second elastic body is provided between the first end of the L-shaped frame 206 and the bottom of the support frame 201 207, a second insertion portion 208 is fixedly arranged at the second end, and the second insertion portion 208 extends into the first through hole 204 and is inserted into the second annular groove 205. Pressing the first end of the L-shaped frame 206 compresses the elastic body to store energy, and the second insertion portion 208 at the second end is separated from the second annular groove to disassemble the wheel mechanism. Releasing the pressing releases the energy of the elastic body, and the second insertion portion 208 at the second end is inserted into the first through hole and the second annular groove under the action of elastic force. It is easy to operate, has a simple structure, and occupies little space. The wheel mechanism can be provided with a brake mechanism 209 as needed.

[0056] Embodiment 4

[0057] Please refer to Fig. 22 , a portable folding trailer, which differs from the first embodiment in that: the first scissor-type mechanism 11 includes three first scissor-type units 111, each adjacent two first scissor-type units 111 are provided with the above-mentioned second upper seat 141 and second lower seat 142, and each adjacent two first scissor-type units 111 have a first scissor-type unit 111 with a connecting rod 112 of the upper part bent so that the width of all the second upper seats 141 is smaller.

[0058] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope covered by the present invention.

Claims

1. A portable folding trailer, comprising a trailer frame, the trailer frame comprising a folding frame and a wheel mechanism that can be mounted on the folding frame; the folding frame comprises two first scissor-type mechanisms spaced apart from each other and two second scissor-type mechanisms spaced apart from each other, the first scissor-type mechanism is provided with at least two first scissor-type units, and the second scissor-type mechanism is provided with at least one second scissor-type unit; the two first scissor-type mechanisms and the two second scissor-type mechanisms are connected to form a rectangular structure, the upper ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first upper seat, and the lower ends of adjacent first scissor-type units and second scissor-type units are rotatably connected together through a first lower seat; characterized in that: The first scissor-type mechanism is also provided with a second upper seat and a second lower seat in the middle, the second upper seat is provided with two upper pivots, the two upper pivots are spaced front to back and aligned left to right, the second lower seat is provided with two lower pivots, two adjacent first scissor-type units have a connecting rod with a bent upper portion, and the upper ends of the two adjacent first scissor-type units are respectively pivotally connected to the two upper pivots of the second upper seat, and the lower ends are respectively pivotally connected to the two lower pivots of the second lower seat.

2. The portable folding trailer according to claim 1, characterized in that: A first telescopic rod group is connected between the corresponding first upper seat and the first lower seat, and a second telescopic rod group is connected between the corresponding second upper seat and the second lower seat.

3. The portable folding trailer according to claim 1, characterized in that: The second lower seat is provided with two lower pivots which are spaced apart front to back and staggered left to right.

4. The portable folding trailer according to claim 1, characterized in that: The first scissor-type unit and the second scissor-type unit both include two connecting rods rotatably connected together in the middle. The two connecting rods of the first scissor-type unit are arranged crosswise inside and outside and in the two adjacent first scissor-type units: the upper part of the connecting rod located on the inner side of one first scissor-type unit is bent outward and rotatably connected to an upper pivot position of the second upper seat, and the upper part of the connecting rod located on the outer side of the other first scissor-type unit is rotatably connected to another upper pivot position of the second upper seat.

5. The portable folding trailer according to claim 1, characterized in that: The folding frame also includes a base frame, which includes a radiating mechanism whose number is equal to the first scissor-type unit of the first scissor-type mechanism and is arranged in the front-to-back direction. The radiating mechanism includes a middle seat and four bottom rods rotatably connected to the middle seat, the ends of two bottom rods are respectively rotatably connected to two first lower seats, and the ends of the other two bottom rods are respectively rotatably connected to two second lower seats.

6. The portable folding trailer according to claim 1, characterized in that: The wheel mechanism is located under the first lower seat, and the wheel mechanism can be detachably connected to the folding frame.

7. The portable folding trailer according to claim 2, characterized in that: The wheel mechanism comprises a U-shaped wheel frame, a wheel and a first connecting shaft, wherein the U-shaped wheel frame comprises a common plate and two split plates respectively connected to both sides of the common plate, the wheel is rotatably connected between the two split plates, the first connecting shaft is mounted on the common plate, and the first connecting shaft can be detachably mounted on the folding frame; A first annular groove is recessed on the upper portion of the first connecting shaft; the first telescopic rod group includes an outer tube and an inner tube slidably arranged in the outer tube, the first lower seat is fixedly arranged at the bottom of the outer tube, and the top of the inner tube and the first upper seat are fixedly arranged together; a mounting component is also fixedly arranged at the bottom of the outer tube, and the mounting component is provided with a horizontally arranged slide groove, and an outer through hole penetrating inside and outside is provided in the area of ​​the outer tube corresponding to the slide groove, and a fixed sleeve is also fixedly arranged in the bottom of the outer tube, and the fixed sleeve is provided with an inner through hole corresponding to the outer through hole; the first connecting shaft is adapted to be inserted into the fixed sleeve, and the slide groove of the mounting component is also slidably connected with a slide seat that can slide horizontally, and the slide seat is provided with a first insertion portion, and the first insertion portion extends into the outer through hole, the inner through hole and is inserted into the first annular groove.

8. The portable folding trailer according to claim 7, characterized in that: The slide seat includes a first side plate and a second side plate that are relatively fixed and horizontally spaced apart. The first side plate is located outside the first side of the outer tube where the outer through hole is provided. The first side plate is fixed with the above-mentioned first insertion portion. The second side plate is located outside the second side of the outer tube that is away from the first side. An elastic body is provided between the second side plate and the outer tube.

9. The portable folding trailer according to claim 8, characterized in that: The slide seat comprises a rectangular frame, and the two side plates facing the rectangular frame constitute the first side plate and the second side plate mentioned above, and the outer tube is located inside the rectangular frame; the mounting component comprises a lower mounting part and an upper mounting part, and the upper and lower mounting parts constitute the above-mentioned slide groove.

10. The portable folding trailer according to claim 2, characterized in that: The wheel mechanism comprises a support frame and two wheels rotatably connected to both sides of the support frame; the first telescopic rod group comprises an outer tube and an inner tube slidably arranged in the outer tube, the first lower seat is fixedly arranged at the bottom of the outer tube, the top of the inner tube and the first upper seat are fixedly arranged together, and the bottom of the outer tube is fixedly provided with a second connecting shaft; the support frame and the second connecting shaft can be detachably connected together; A second annular groove is recessed at the lower portion of the second connecting shaft; an insertion hole is recessed at the support frame, and a first through hole is provided on the support frame that penetrates inside and outside the insertion hole, and the second connecting shaft is adapted to be inserted into the insertion hole. The wheel mechanism also includes an L-shaped frame, and the middle portion of the L-shaped frame is rotatably connected to the bottom of the support frame. An elastic body is provided between one end of the L-shaped frame and the support frame, and a second insertion portion is fixedly provided at the other end, and the second insertion portion extends into the first through hole and is inserted into the second annular groove.

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