A scalable convoy trailer

Abstract

This utility model relates to an expandable folding trailer, comprising a trailer frame, an extension frame, and a stabilizing frame. The trailer frame includes a first column, a second column, a third column, a fourth column, a folding mechanism, and a base support mechanism; the four columns are arranged in a rectangular interval, with their lower ends connected to the base support mechanism; folding mechanisms are provided between the first and second columns, between the third and fourth columns, and between the fourth column and the first column. The lower end of the extension frame is rotatably connected to the lower ends of the second and third columns at a limited angle, and the upper end of the extension frame is detachably connected to the upper ends of the second and third columns. The stabilizing frame includes a telescopic rod assembly and a folding rod assembly, with both ends of the telescopic rod assembly and the folding rod assembly connected to the second and third columns, respectively. The stabilizing frame provides sufficient lateral tensile and support force to the second and third columns, preventing a decrease in trailer frame stability after the extension frame is folded down, thus improving the strength of the trailer frame.

Description

Technical Field

[0001] This utility model relates to the field of trailer technology, and in particular to an expandable convergent trailer. Background Technology

[0002] In daily life and production, it is often necessary to move luggage or other items. Trailers are widely used for this purpose due to their ease of movement and time-saving and labor-saving characteristics. To facilitate storage, trailers are designed with a foldable structure, taking up little space and making them easy to carry. However, when fully unfolded, a trailer's volume is fixed and cannot be expanded to move larger or larger items. To address this issue, folding trailers with a foldable rear frame have been designed to expand the trailer's volume. However, with existing folding trailers, the lack of a load-bearing rear frame in the original trailer frame after folding down reduces the trailer's stability and significantly weakens its load-bearing capacity. This often results in the trailer frame deforming and becoming unable to fold during use, leading to a very poor user experience. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an expandable convoy trailer.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the expandable convoy trailer of this utility model includes a trailer frame, an extension frame, and a stabilizing frame.

[0007] The trailer frame includes a first column, a second column, a third column, a fourth column, a folding mechanism that can be folded together, and a bottom support mechanism; the four columns are arranged in a rectangular interval, and their lower ends are all connected to the bottom support mechanism; the folding mechanism is provided between the first column and the second column, between the third column and the fourth column, and between the fourth column and the first column;

[0008] The lower end of the extended frame is rotatably connected to the lower ends of the second column and the third column at a limited angle, and the upper end of the extended frame is detachably connected to the second column and the third column.

[0009] The stabilizing frame includes a telescopic rod assembly and a folding rod assembly, with both ends of the telescopic rod assembly and the folding rod assembly connected to the second column and the third column, respectively.

[0010] Optionally, the first end of the telescopic rod assembly is hinged to the upper end of the second column, and the second end of the telescopic rod assembly is detachably connected to the upper end of the third column.

[0011] Optionally, the upper end of the third column is provided with a positioning groove, and the second end of the telescopic rod assembly is provided with a positioning buckle, the positioning buckle being detachably connected to the positioning groove.

[0012] Optionally, the telescopic rod assembly includes a first sleeve and a second sleeve, with the first end of the first sleeve slidably fitted into the second sleeve, and the first end of the first sleeve being provided with a spring buckle.

[0013] Optionally, the two ends of the folding rod assembly are respectively connected to the lower ends of the second column and the third column with a limited angle of rotation.

[0014] Optionally, the folding rod assembly includes a middle flipping component, a first upper crossbar, a second upper crossbar, a first lower crossbar, and a second lower crossbar;

[0015] The intermediate flipping component is located between the first upper crossbar and the second upper crossbar, and the first ends of the first upper crossbar, the second upper crossbar, the first lower crossbar, and the second lower crossbar are all rotatably connected to the intermediate flipping component;

[0016] The second ends of the first upper crossbar and the first lower crossbar are rotatably connected to the lower end of the second column at a limited angle, and the second ends of the second upper crossbar and the second lower crossbar are rotatably connected to the lower end of the third column at a limited angle.

[0017] Optionally, the trailer frame further includes a handle mechanism, which includes a handle, a telescopic rod, a locking assembly, and a button;

[0018] The handle is located at the first end of the telescopic rod, and the second end of the telescopic rod is hinged between the first column and the fourth column via two connecting rods;

[0019] The locking component is disposed inside the telescopic rod, and the button is disposed on the handle, and the button is connected to the locking component.

[0020] Optionally, the base support mechanism includes a connector and multiple connecting pipes;

[0021] The first ends of the multiple connecting pipes are rotatably connected to the connecting member at a limited angle, and the second ends of the multiple connecting pipes are rotatably connected to the lower ends of the first column, the second column, the third column and the fourth column respectively.

[0022] Optionally, the folding mechanism includes a plurality of fork assemblies that are hinged in sequence, and the first column, the second column, the third column and the fourth column are all provided with sliding sleeves;

[0023] One fork of the fork assembly connecting the first column, the second column, the third column, and the fourth column is hinged to the sliding sleeve on the corresponding column, and the other fork is hinged to the upper end of the corresponding column.

[0024] In the folding mechanism between the first column and the second column, a convergence buckle is hinged to the fork assembly connecting the second column.

[0025] Optionally, the upper ends of the first column, the second column, the third column, and the fourth column are all provided with expansion slots.

[0026] (III) Beneficial Effects

[0027] Folding mechanisms are installed between the first and second pillars, between the third and fourth pillars, and between the fourth and first pillars. The height of each folding mechanism after folding is no higher than the height of the pillar. This ensures that the height of the expandable folding trailer in the folded state will not exceed the height of the pillar, reducing the folded volume and making it easier for users to store.

[0028] After the extension frame is rotated open, it is located on the same plane as the base support mechanism, which is used to expand the area of ​​the base support mechanism. The side frame corresponding to the extension frame on the trailer frame is removed, which makes it easier for the trailer to load larger or larger items, and improves the spatial flexibility and loading capacity of the expandable folding trailer.

[0029] The two ends of the telescopic rod assembly are connected to the second and third uprights respectively, and the two ends of the folding rod assembly are also connected to the second and third uprights respectively. When the trailer is in the extended state, both the telescopic rod assembly and the folding rod assembly are supported between the second and third uprights. When the trailer frame is fully extended, both the telescopic rod assembly and the folding rod assembly are at their maximum extension, providing sufficient lateral tensile and support forces to the second and third uprights. This prevents the trailer frame from becoming less stable after the extended frame is laid down due to the lack of side frames as load-bearing structures. The telescopic rod assembly and the folding rod assembly improve the strength of the trailer frame, thereby increasing the load-bearing capacity of the trailer frame in the fully extended state. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the expandable folding trailer of this utility model;

[0031] Figure 2 This is a magnified view of point B;

[0032] Figure 3 This is a schematic diagram of the telescopic rod assembly of this utility model;

[0033] Figure 4 for Figure 3 Cross-sectional view at point AA;

[0034] Figure 5 This is a structural schematic diagram of the folding rod assembly of this utility model;

[0035] Figure 6 This is a schematic diagram of the folding rod assembly of this utility model in a semi-folded state.

[0036] Figure 7 This is a cross-sectional schematic diagram of the handle mechanism of this utility model;

[0037] Figure 8 This is a magnified view of point D;

[0038] Figure 9 This is a schematic diagram of the bottom support mechanism of this utility model;

[0039] Figure 10 This is a schematic diagram of the folding mechanism of this utility model.

[0040] [Explanation of Labels in the Attached Image]

[0041] 11: First upright; 12: Second upright; 13: Third upright; 131: Positioning groove; 14: Fourth upright; 151: First folding mechanism; 152: Second folding mechanism; 153: Third folding mechanism; 1501: Fork assembly; 16: Base support mechanism; 160: Connector; 161: Connecting pipe; 17: Base fixing component; 18: Top fixing component 18;

[0042] 2: Extended frame; 21: Main tube; 22: Extended folding mechanism; 23: C-groove;

[0043] 31: Telescopic rod assembly; 310: Positioning buckle; 311: First sleeve; 312: Second sleeve; 313: Spring buckle; 32: Folding rod assembly; 320: Middle flipping component; 321: First upper crossbar; 322: Second upper crossbar; 323: First lower crossbar; 324: Second lower crossbar;

[0044] 4: Handle mechanism; 41: Handle; 42: Telescopic rod; 43: Locking assembly; 44: Button; 431: Lock body; 432: Lock tongue; 433: Push rod; 434: Spring;

[0045] 5: Sliding sleeve;

[0046] 6: Gathering buckle;

[0047] 7: Expansion slot. Detailed Implementation

[0048] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," etc., are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0049] While exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0050] like Figure 1 As shown, this utility model provides an expandable folding trailer that can further expand the trailer space in the unfolded state, improving the trailer's spatial flexibility and volume.

[0051] See Figure 1 The expandable folding trailer includes a trailer frame, an extension frame 2, and a stabilizing frame. The trailer frame includes a first column 11, a second column 12, a third column 13, a fourth column 14, a folding mechanism, and a base support mechanism 16. The first column 11, the second column 12, the third column 13, and the fourth column 14 are all vertically arranged, and the four columns are arranged in a rectangular interval in both the unfolded and folded states of the trailer. Each of the four uprights is equipped with a base fixing piece 17 at its lower end. The four uprights are connected to the base support mechanism 16 through their respective base fixing pieces 17. The base support mechanism 16 can be folded upwards and bring the four uprights together. The height of the base support mechanism 16 after folding and gathering is not higher than the height of the uprights. Folding mechanisms that can be folded and gathered are provided between the first upright 11 and the second upright 12, between the third upright 13 and the fourth upright 14, and between the fourth upright 14 and the first upright 11. The height of each folding mechanism after folding and gathering is not higher than the height of the uprights. This ensures that the height of the expandable and foldable trailer in the folded state will not exceed the height of the uprights, reducing the folded volume and making it easier for users to store.

[0052] like Figure 1 As shown, the lower end of the extension frame 2 is rotatably connected to the lower ends of the second column 12 and the third column 13 at a limited angle, with the rotation angle not exceeding 90 degrees, preferably 90 degrees. After the extension frame 2 is rotated open, it is located on the same plane as the base support mechanism 16, which expands the area of ​​the base support mechanism 16. Furthermore, the corresponding side frame of the extension frame 2 on the trailer frame is removed, facilitating the loading of larger or larger items and improving the spatial flexibility and loading capacity of the expandable trailer. The upper end of the extension frame 2 is detachably connected to the upper ends of the second column 12 and the third column 13, improving operational convenience through the detachable connection structure. Specifically, see... Figure 1 and Figure 9 The extension frame 2 includes a pair of main pipes 21 and an extension folding mechanism 22 connected between the pair of main pipes 21. The extension folding mechanism 22 can fold and gather the two main pipes 21 as the trailer is folded. The first end of the main pipe 21 is rotatably connected to the corresponding column at a limited angle, and the second end of the main pipe 21 is provided with a C-shaped groove 23 for engaging with the corresponding column.

[0053] See Figure 1 The stabilizing frame includes a telescopic rod assembly 31 and a folding rod assembly 32. The two ends of the telescopic rod assembly 31 are connected to the second column 12 and the third column 13 respectively, and the two ends of the folding rod assembly 32 are also connected to the second column 12 and the third column 13 respectively. When the trailer is in the extended state, both the telescopic rod assembly 31 and the folding rod assembly 32 are supported between the second column 12 and the third column 13. When the trailer frame is fully extended, both the telescopic rod assembly 31 and the folding rod assembly 32 are at their maximum extension, providing sufficient lateral tensile and support forces to the second column 12 and the third column 13. This prevents the trailer frame from becoming less stable after the extended frame 2 is laid down due to the lack of side frames as load-bearing structures. The telescopic rod assembly 31 and the folding rod assembly 32 improve the strength of the trailer frame, thereby increasing its load-bearing capacity in the fully extended state.

[0054] like Figure 1 As shown, the two ends of the telescopic rod assembly 31 are respectively connected to the upper ends of the second column 12 and the third column 13, providing lateral tensile and supporting forces to the upper ends of the second column 12 and the third column 13, further increasing the strength of the trailer frame. Simultaneously, it prevents the upper ends of the second column 12 and the third column 13 from becoming free ends and easily bending and deforming under stress. Furthermore, the first end of the telescopic rod assembly 31 is hinged to the second column 12, and the second end of the telescopic rod assembly 31 is detachably connected to the third column 13. When the trailer frame needs to be folded, the second end of the telescopic rod assembly 31 is removed, and the telescopic rod assembly 31 hangs naturally under its own weight, without interfering with the folding and closing of the trailer frame. As long as the length of the telescopic rod assembly 31 after retraction is less than the length of the column, the telescopic rod assembly 31 will not have any impact on the volume of the trailer frame after folding and closing.

[0055] Furthermore, such as Figure 1 and Figure 2As shown, each column has a top foot fixing member 18 for installing the folding mechanism at its upper end. The top foot fixing member 18 at the upper end of the third column 13 has a positioning groove 131 located on the side of the third column 13 facing the second column 12. The opening of the positioning groove 131 faces upwards, and a notch is provided on its side. A positioning buckle 310 is provided at the second end of the telescopic rod assembly 31. The positioning buckle 310 includes a horizontal arm and a vertical arm connected in a cross structure, with the vertical arm sleeved on the second end of the telescopic rod assembly 31. See also... Figure 2 When the positioning buckle 310 is connected to the positioning groove 131, the horizontal arm is engaged in the positioning groove 131, and the vertical arm is placed in the notch on the side of the positioning groove 131. When disassembling, the positioning buckle 310 can be pulled out from the positioning groove 131, which is convenient to operate.

[0056] like Figure 3 and Figure 4 As shown, the telescopic rod assembly 31 includes a first sleeve 311 and a second sleeve 312. The first end of the first sleeve 311 is slidably fitted into the second sleeve 312. The first end of the first sleeve 311 is provided with a spring buckle 313. When the first sleeve 311 slides to the through hole on the second sleeve 312 corresponding to the spring buckle 313, the spring buckle 313 passes through the through hole and locks the current position of the first sleeve 311 and the second sleeve 312. At this time, the length of the telescopic rod assembly 31 is fixed so that the second column 12 and the third column 13 can provide lateral tension and support force. Specifically, the positioning buckle 310 is installed at the end of the second end of the first sleeve 311, which is used for both installation and fixation of the second end and acts as an end plug. The end of the second end of the first sleeve 311 is provided with an inner plug. The first end of the second sleeve 312 is provided with a guide sleeve, which serves to guide, lubricate, and prevent dust. The second end of the second sleeve 312 is provided with an end plug.

[0057] like Figure 1 The two ends of the folding rod assembly 32 are respectively connected to the lower ends of the second column 12 and the third column 13 with a limited angle of rotation, providing lateral tension and support to the lower ends of the second column 12 and the third column 13, further increasing the strength of the trailer frame.

[0058] See Figure 5 and Figure 6The folding rod assembly 32 includes a central flip-up member 320, a first upper crossbar 321, a second upper crossbar 322, a first lower crossbar 323, and a second lower crossbar 324. The central flip-up member 320 is located between the first upper crossbar 321 and the second upper crossbar 322. The first ends of the first upper crossbar 321, the second upper crossbar 322, the first lower crossbar 323, and the second lower crossbar 324 are all rotatably connected to the central flip-up member 320. Specifically, the central flip-up member 320 has a trapezoidal structure with two pairs of hinge shafts symmetrically arranged on it. The first ends of the first upper crossbar 321 and the first lower crossbar 323 are rotatably connected to the two hinge shafts located on the left side, and the first ends of the second upper crossbar 322 and the second lower crossbar 324 are rotatably connected to the two hinge shafts located on the right side, respectively. The first upper crossbar 321 and the first lower crossbar 323 are arranged in parallel. The second ends of both the first upper crossbar 321 and the first lower crossbar 323 are rotatably connected to the lower end of the second column 12 at a limited angle. The second ends of the second upper crossbar 322 and the second lower crossbar 324 are rotatably connected to the lower end of the third column 13 at a limited angle. When the trailer frame is in the unfolded state, the state of the folding rod assembly 32 is shown in the figure. Figure 5 Lateral support is provided between the second column 12 and the third column 13, and the double-bar structure further enhances the strength of the lateral support. During the folding process of the trailer frame, the folding rod assembly 32 folds in half around the central flip-over piece 320; the folding process is described in detail below. Figure 6 When fully folded, the base fixing parts 17 at the lower ends of the second column 12 and the third column 13 can fully contact each other without increasing the folded volume of the trailer. It should be noted that all the structures that limit the rotation angle in this application adopt a groove structure. The rod or tube is hinged to the side wall of the groove through a shaft. After the rod or tube rotates to abut against the bottom surface of the groove, it cannot continue to rotate due to the restriction of the bottom surface of the groove, thereby limiting the rotation angle. The angle at which the rod or tube first engages can be controlled by changing the angle of the bottom surface of the groove.

[0059] like Figure 1 and Figure 7 As shown, the trailer frame also includes a handle mechanism 4, which includes a handle 41, a telescopic rod 42, a locking assembly 43, and a button 44. The handle 41 is ring-shaped and located at the first end of the telescopic rod 42. The second end of the telescopic rod 42 is hinged between the first column 11 and the fourth column 14 via two connecting rods. The locking assembly 43 is disposed within the telescopic rod 42, and the button 44 is disposed on the handle 41, connected to the locking assembly 43. For details, see [link to documentation]. Figure 8The locking assembly 43 includes a lock body 431, a latch 432, a push rod 433, and a spring 434. The latch 432 is slidably connected to the lock body 431, and the axis of the latch 432 is perpendicular to the telescopic rod 42. The spring 434 is disposed between the latch 432 and the lock body 431. The lock body 431 is installed at the end of the first pull rod of the telescopic rod 42. The push rod 433 is sleeved inside the first pull rod. The first end of the push rod 433 is connected to the button 44, and the second end of the push rod 433 is provided with an inclined surface. The latch 432 is also provided with an inclined surface. When the button 44 is pressed, the push rod 433 moves and drags the latch 432 back. After the button 44 is released, the latch 432 is reset under the action of the spring 434, pushing the push rod 433 in the opposite direction to reset the button 44. Another lever has a lock hole. When the locking tongue 432 moves to the lock hole, it inserts into the lock hole to lock the length of the telescopic lever 42. By controlling the position and number of lock holes, the length of the telescopic lever 42 can be controlled to accommodate users of different heights.

[0060] like Figure 1 , Figure 9 As shown, the base support mechanism 16 includes a connector 160 and multiple connecting pipes 161. The first ends of the multiple connecting pipes 161 are rotatably connected to the connector 160 at a limited angle, and the second ends are respectively rotatably connected to the base fixing parts 17 at the lower ends of the first column 11, the second column 12, the third column 13 and the fourth column 14.

[0061] like Figure 1 , Figure 10 As shown, the folding mechanism includes a first folding mechanism 151 disposed between the first column 11 and the second column 12, a second folding mechanism 152 disposed between the third column 13 and the fourth column 14, and a third folding mechanism 153 disposed between the first column 11 and the fourth column 14. Each of the first folding mechanism 151, the second folding mechanism 152, and the third folding mechanism 153 includes multiple sequentially hinged fork assemblies 1501, which are of conventional structure. Each of the first column 11, the second column 12, the third column 13, and the fourth column 14 is provided with a sliding sleeve 5. One fork of the fork assembly 1501 connecting the first column 11, the second column 12, the third column 13, and the fourth column 14 is hinged to the sliding sleeve 5 on the corresponding column, and the other fork is hinged to the top foot fixing member 18 on the corresponding column. Preferably, the first folding mechanism 151 and the second folding mechanism 152 are arranged opposite to each other, each including three sequentially hinged fork assemblies 1501; the third folding mechanism 153 and the extension folding mechanism 22 are arranged opposite to each other, each including two sequentially hinged fork assemblies 1501. See also Figure 1 , Figure 9 , Figure 10In the first folding mechanism 151, a convergent buckle 6 is hinged to the fork assembly 1501 connected to the second column 12. The convergent buckle 6 is elongated, with one end hinged to the hinge point of the fork assembly 1501 connected to the second column 12, and the other end being a free end with a hanging hole. When the trailer frame is in the folded state, the hanging hole can connect with a protrusion located symmetrically in the first folding mechanism 151, thereby locking the folded state of the first folding mechanism 151 through the convergent buckle 6, thus locking the folded state of the trailer frame.

[0062] like Figure 1 and Figure 2 As shown, the upper ends of the first column 11, the second column 12, the third column 13, and the fourth column 14 are all provided with expansion slots 7 for users to install and expand other products, such as tabletops, brackets, etc. Specifically, the expansion slots 7 are installed on the top foot fixing parts 18 at the upper end of each column, or are integrated with the top foot fixing parts 18. The expansion slots 7 are preferably C-shaped grooves with the opening facing upwards, and the grooves are provided with limit stops. The lower ends of the first column 11, the second column 12, the third column 13, and the fourth column 14 are all provided with casters for convenient transport of items by users.

[0063] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0065] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A scalable convoy trailer, characterized in that, The scalable convergence trailer includes a trailer frame, an extension frame (2), and a stabilizing frame; The trailer frame includes a first column (11), a second column (12), a third column (13), a fourth column (14), a folding mechanism, and a bottom support mechanism (16) that can be folded together; the four columns are arranged in a rectangular interval, and their lower ends are all connected to the bottom support mechanism (16); the folding mechanism is provided between the first column (11) and the second column (12), between the third column (13) and the fourth column (14), and between the fourth column (14) and the first column (11); The lower end of the extended frame (2) is rotatably connected to the lower ends of the second column (12) and the third column (13) at a limited angle, and the upper end of the extended frame (2) is detachably connected to the second column (12) and the third column (13). The stabilizing frame includes a telescopic rod assembly (31) and a folding rod assembly (32), both ends of which are connected to the second column (12) and the third column (13), respectively.

2. The scalable convergence trailer as described in claim 1, characterized in that, The first end of the telescopic rod assembly (31) is hinged to the upper end of the second column (12), and the second end of the telescopic rod assembly (31) is detachably connected to the upper end of the third column (13).

3. The scalable convergence trailer as described in claim 2, characterized in that, The upper end of the third column (13) is provided with a positioning groove (131), and the second end of the telescopic rod assembly (31) is provided with a positioning buckle (310). The positioning buckle (310) is detachably connected to the positioning groove (131).

4. The scalable convergence trailer as described in claim 3, characterized in that, The telescopic rod assembly (31) includes a first sleeve (311) and a second sleeve (312). The first end of the first sleeve (311) is slidably sleeved in the second sleeve (312), and the first end of the first sleeve (311) is provided with a spring buckle (313).

5. The scalable convoy trailer as described in any one of claims 1-4, characterized in that, The two ends of the folding rod assembly (32) are respectively connected to the lower ends of the second column (12) and the third column (13) with a limited angle of rotation.

6. The scalable convergence trailer as described in claim 5, characterized in that, The folding rod assembly (32) includes a middle flipping component (320), a first upper crossbar (321), a second upper crossbar (322), a first lower crossbar (323), and a second lower crossbar (324); The intermediate flipping component (320) is located between the first upper crossbar (321) and the second upper crossbar (322), and the first ends of the first upper crossbar (321), the second upper crossbar (322), the first lower crossbar (323) and the second lower crossbar (324) are all rotatably connected to the intermediate flipping component (320). The second ends of the first upper crossbar (321) and the first lower crossbar (323) are rotatably connected to the lower end of the second column (12) at a limited angle, and the second ends of the second upper crossbar (322) and the second lower crossbar (324) are rotatably connected to the lower end of the third column (13) at a limited angle.

7. The scalable convergence trailer as described in any one of claims 1-4, characterized in that, The trailer frame also includes a handle mechanism (4), which includes a handle (41), a telescopic rod (42), a locking assembly (43), and a button (44); The handle (41) is located at the first end of the telescopic rod (42), and the second end of the telescopic rod (42) is hinged between the first column (11) and the fourth column (14) through two connecting rods; The locking component (43) is disposed inside the telescopic rod (42), and the button (44) is disposed on the handle (41). The button (44) is connected to the locking component (43).

8. The scalable convergence trailer as described in any one of claims 1-4, characterized in that, The bottom support mechanism (16) includes a connector (160) and multiple connecting pipes (161); The first ends of the multiple connecting pipes (161) are rotatably connected to the connector (160) at a limited angle, and the second ends of the multiple connecting pipes (161) are rotatably connected to the lower ends of the first column (11), the second column (12), the third column (13) and the fourth column (14) respectively.

9. The scalable convergence trailer as described in any one of claims 1-4, characterized in that, The folding mechanism includes multiple fork assemblies (1501) that are hinged in sequence, and the first column (11), the second column (12), the third column (13) and the fourth column (14) are all provided with sliding sleeves (5); One fork of the fork assembly (1501) connecting the first column (11), the second column (12), the third column (13), and the fourth column (14) is hinged to the sliding sleeve (5) on the corresponding column, and the other fork is hinged to the upper end of the corresponding column. In the folding mechanism between the first column (11) and the second column (12), a convergence buckle (6) is hinged to the fork assembly (1501) connecting the second column (12).

10. The scalable convergence trailer as described in any one of claims 1-4, characterized in that, The upper ends of the first column (11), the second column (12), the third column (13) and the fourth column (14) are all provided with expansion slots (7).

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