Foldable trolley
By setting up reinforcement rods and fixing strips at the chassis connection of the foldable cart, the problem of insufficient chassis connection strength is solved, and higher load-bearing capacity and ride comfort are achieved.
Patent Information
- Application Number
- CN202422411323.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The chassis folding area of existing foldable carts is insufficient, and it is prone to deformity when placing heavy objects or children ride.
A reinforcement rod is provided at the connection between the first support rod and the second support rod of the chassis, and a reinforcement connection is strengthened by a fixing bar and a fixing block to ensure that the reinforcement rod and the support rod rotate simultaneously to increase the connection strength.
It improves the connection strength at the folding chassis, prevents deformation, and increases riding comfort and load-bearing capacity.
Smart Images
Figure CN223148489U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of trolleys, and more particularly to a foldable trolley. Background Art
[0002] In recent years, family outdoor activities have gradually become more popular, especially traveling and outdoor camping. When engaging in outdoor activities, many items are usually carried, and in families with children, a child stroller is generally also carried. However, the emergence of foldable trolleys has made people's outings more convenient. Foldable trolleys can not only hold items but also be used for children to ride.
[0003] Existing foldable trolleys generally include a frame, a chassis, wheels, and a handle. The frame and the chassis are usually rectangular frame structures and are connected with a folding structure. A cloth cover is installed on the frame for placing items, and the chassis is used to support the cloth cover. However, in the prior art, there is often a problem of insufficient connection strength at the folding part of the chassis. When heavy items are placed or a child rides, the chassis is prone to deformation. Summary of the Utility Model
[0004] In order to increase the connection strength at the folding part of the chassis, the present application provides a foldable trolley.
[0005] The foldable trolley provided by the present application adopts the following technical solutions:
[0006] A foldable trolley includes a chassis, a first frame, and a second frame located on both sides of the chassis. The chassis includes:
[0007] Two first support rods, one end of each of the two first support rods is rotatably connected to the first frame;
[0008] Two second support rods, one end of each of the two second support rods is rotatably connected to the second frame;
[0009] A first support frame, the first support frame is fixed between the two first support rods;
[0010] A second support frame, the second support frame is fixed between the two second support rods;
[0011] A reinforcing rod, one end of the reinforcing rod is fixed on the first support frame, one end of the second support rod is rotatably connected to the first support rod and the reinforcing rod at the same time. The rotation point of the second support rod and the reinforcing rod is coaxial with the rotation point of the second support rod and the first support rod. The second support rod is located between the first support rod and the reinforcing rod.
[0012] By adopting the above technical solution, the reinforcing rod is fixed on the first support frame and fixedly connected to the first support rod. One end of the second support rod is rotatably connected to both the first support rod and the reinforcing rod. The rotation point between the second support rod and the reinforcing rod is coaxial with the rotation point between the second support rod and the first support rod. When a downward pressure is applied at the rotating shaft, the reinforcing rod can share a part of the pressure, thereby increasing the connection strength at the folding part of the chassis.
[0013] Preferably, at the rotating shaft of the first support rod and the reinforcing rod, there is a fixing strip which restricts the connection between the first support rod and the second support rod from bending downward, and the fixing strip is fixedly connected to the first support rod and the reinforcing rod.
[0014] Preferably, there is a fixing block between the first support rod and the reinforcing rod, and the fixing block is fixedly connected to the first support rod and the reinforcing rod.
[0015] Preferably, the first support frame, the second support frame, the two first support rods and the two second support rods enclose a hollow area.
[0016] Preferably, the first support frame includes a plurality of cross columns and vertical columns. The cross columns are fixedly connected between the vertical columns. The vertical columns are fixedly connected to the first support rod, and the reinforcing rod is fixedly connected to the vertical columns.
[0017] Preferably, a first folding rod and a second folding rod are provided under the chassis. The first folding rod and the second folding rod are arranged in a cross shape. The first folding rod has a first folding arm and a second folding arm. One end of the first folding arm is rotatably connected to the first vehicle frame. One end of the second folding arm is rotatably connected to the second vehicle frame. The other end of the first folding arm is rotatably connected to the other end of the second folding arm. The second folding rod has a third folding arm and a fourth folding arm. One end of the third folding arm is rotatably connected to the first vehicle frame. One end of the fourth folding arm is rotatably connected to the second vehicle frame. The other end of the third folding arm is rotatably connected to the other end of the fourth folding arm.
[0018] Preferably, the third folding arm presses on the first folding arm, and the second folding arm presses on the fourth folding arm.
[0019] Preferably, a protective sleeve is provided at the connection between the first folding arm and the second folding arm, and the protective sleeve seals the connection between the first folding arm and the second folding arm.
[0020] Preferably, a third folding rod and a fourth folding rod are provided between the first vehicle frame and the second vehicle frame. One ends of the third folding rod and the fourth folding rod are respectively rotatably connected to the first vehicle frame, and the other ends of the third folding rod and the fourth folding rod are respectively rotatably connected to the second vehicle frame. The third folding rod and the fourth folding rod have a plurality of folding arms. Adjacent folding arms of the third folding rod are rotatably connected to each other, and adjacent folding arms of the fourth folding rod are rotatably connected to each other. The folding arms of the third folding rod and the folding arms of the fourth folding rod are arranged in a cross manner, and the cross points of the folding arms of the third folding rod and the folding arms of the fourth folding rod are rotatably connected.
[0021] Preferably, a fifth folding rod and a sixth folding rod are provided between the first vehicle frame and the second vehicle frame. The fifth folding rod has two folding arms. One ends of the two folding arms of the fifth folding rod are rotatably connected, and the other ends of the two folding arms of the fifth folding rod are respectively rotatably connected to the first vehicle frame and the second vehicle frame. The sixth folding rod includes two parallel arms and two folding arms. One ends of the two parallel arms of the sixth folding rod are respectively rotatably connected to the first vehicle frame and the second vehicle frame. The other ends of the two parallel arms of the sixth folding rod are respectively rotatably connected to one ends of the two folding arms of the sixth folding rod. The other ends of the two folding arms of the sixth folding rod are rotatably connected. The folding arms of the fifth folding rod and the folding arms of the sixth folding rod are arranged in a cross manner, and the cross points of the folding arms of the fifth folding rod and the folding arms of the sixth folding rod are rotatably connected.
[0022] In summary, the present application includes at least one of the following beneficial technical effects:
[0023] A reinforcing rod is fixed on the first support frame. The reinforcing rod is fixedly connected to the first support rod. The reinforcing rod can increase the connection strength at the folding part of the chassis.
[0024] A fixing strip is fixed between the first support rod and the reinforcing rod. The fixing strip can limit the downward bending at the connection part of the first support rod and the second support rod.
[0025] The hollow area enclosed by the first support frame, the second support frame, the two first support rods and the two second support rods allows children to stretch out their feet, making it more comfortable for children to ride. Description of the Drawings
[0026] Figure 1 is a schematic structural diagram of a foldable stroller in an embodiment of the present application.
[0027] Figure 2 is a top view of the chassis and the vehicle frame in an embodiment of the present application.
[0028] Figure 3 is Figure 1Schematic diagram of partial enlargement at position A in
[0029] Figure 4 It is a schematic diagram of the connection structure between the first folding rod and the second folding rod and the frame in the embodiment of the present application.
[0030] Figure 5 It is an exploded schematic diagram of the connection part between the first folding rod and the second folding rod in the embodiment of the present application.
[0031] Figure 6 It is a folding and storage schematic diagram of a foldable trolley with a folding method of setting the first folding rod and the second folding rod in the embodiment of the present application.
[0032] Figure 7 It is a schematic diagram of the structure of a foldable trolley with a folding method of setting the third folding rod and the fourth folding rod in the embodiment of the present application.
[0033] Figure 8 It is a folding and storage schematic diagram of a foldable trolley with a folding method of setting the third folding rod and the fourth folding rod in the embodiment of the present application.
[0034] Figure 9 It is a schematic diagram of the structure of a foldable trolley with a folding method of setting the fifth folding rod and the sixth folding rod in the embodiment of the present application.
[0035] Figure 10 It is a folding and storage schematic diagram of a foldable trolley with a folding method of setting the fifth folding rod and the sixth folding rod in the embodiment of the present application.
[0036] Explanation of reference numerals: 1, chassis; 2, frame; 11, first support plate; 12, second support plate; 21, first frame; 22, second frame; 3, folding mechanism; 111, first support rod; 121, second support rod; 13, strengthening rod; 112, first support frame; 122, second support frame; 14, folding shaft; 15, fixing block; 16, fixing strip; 4, hollow area; 17, cross column; 18, vertical column; 31, first folding rod; 32, second folding rod; 23, upright column; 231, sleeve; 311, first folding arm; 312, second folding arm; 321, third folding arm; 322, fourth folding arm; 33, protective sleeve; 34, third folding rod; 35, fourth folding rod; 36, folding arm; 37, fifth folding rod; 38, sixth folding rod; 39, parallel arm. Detailed implementation manners
[0037] The following further elaborates on the present application in conjunction with the attached Figures 1-10 drawings.
[0038] The embodiment of the present application discloses a foldable trolley. Refer to Figure 1, including a chassis 1 and a frame 2. The chassis 1 includes a first support plate 11 and a second support plate 12, and the frame 2 includes a first frame 21 and a second frame 22. The first support plate 11 is rotatably connected to the first frame 21, the second support plate 12 is rotatably connected to the second frame 22, and the first support plate 11 and the second support plate 12 are rotatably connected to each other. A folding mechanism 3 is provided between the first frame 21 and the second frame 22, and the folding mechanism 3 is rotatably connected to the first frame 21 and the second frame 22. When the folding mechanism 3 is retracted, the first frame 21 and the second frame 22 approach each other, thereby realizing folding.
[0039] Referring to Figure 1 and Figure 2 , the first support plate 11 includes a first support rod 111, the second support plate 12 includes a second support rod 121. One end of the first support rod 111 is rotatably connected to the first frame 21, the other end of the first support rod 111 is rotatably connected to one end of the second support rod 121, and the other end of the second support rod 121 is rotatably connected to the second frame 22. At the rotating shaft of the first support rod 111 and the second support rod 121, a reinforcing rod 13 is coaxially connected. The second support rod 121 is located between the first support rod 111 and the reinforcing rod 13, and the reinforcing rod 13 is relatively fixed to the first support rod 111 and rotates synchronously with the first support rod 111.
[0040] The reinforcing rod 13 is arranged parallel to the first support rod 111. One end of the second support rod 121 is rotatably connected to both the first support rod 111 and the reinforcing rod 13 at the same time, and the rotating connection of the second support rod 121 and the reinforcing rod 13 and the rotating connection of the second support rod 121 and the first support rod 111 are coaxial. There are two first support rods 111 and two second support rods 121 respectively. Correspondingly, there are also two reinforcing rods 13. The first support plate 11 further includes a first support frame 112, and the first support frame 112 is fixed between the two first support rods 111. Similarly, the second support plate 12 also includes a second support frame 122, and the second support frame 122 is fixed between the two second support rods 121. One end of the reinforcing rod 13 is fixed on the first support frame 112, and the other end of the reinforcing rod 13 is coaxially connected to the first support rod 111 and the second support rod 121. The common rotating shaft of the reinforcing rod 13, the first support rod 111 and the second support rod 121 is the folding shaft 14. The implementation manner of the folding shaft 14 can be to connect the first support rod 111, the second support rod 121 and the reinforcing rod 13 by bolts, and the bolts form the rotating shaft of the first support rod 111, the second support rod 121 and the reinforcing rod 13. The reinforcing rod 13 is relatively fixed to the first support rod 111, and the reinforcing rod 13 rotates around the folding shaft 14 together with the first support rod 111.
[0041] Referring to Figure 1 and Figure 3, there is a fixing block 15 between the first support rod 111 and the reinforcing rod 13, and the fixing block 15 further fixedly connects the first support rod 111 and the reinforcing rod 13. There is a fixing strip 16 at the folding shaft 14, and the fixing strip 16 further fixedly connects the first support rod 111 and the reinforcing rod 13. Specifically, the fixing strip 16 can be arranged on the side of the folding shaft 14 close to the second support frame 122 and above the second support rod 121. When a downward pressure is applied to the connection between the first support rod 111 and the second support rod 121, the part of the first support rod 111 and the reinforcing rod 13 on the side of the folding shaft 14 close to the second support frame 122 has a tendency to bend downward. At this time, the part of the second support rod 121 on the side of the folding shaft 14 close to the first support frame 112 has a tendency to bend downward, while the part of the second support rod 121 on the side of the folding shaft 14 close to the second support frame 122 has a tendency to bend upward. Since the fixing strip 16 is located on the side of the folding shaft 14 close to the second support frame 122, the downward bending force of the part of the first support rod 111 and the reinforcing rod 13 on the side of the folding shaft 14 close to the second support frame 122 and the upward bending force of the part of the second support rod 121 on the side of the folding shaft 14 close to the second support frame 122 cause the fixing strip 16 to press against the second support rod 121, thereby restricting the downward bending of the connection between the first support rod 111 and the second support rod 121. In addition, the fixing strip 16 can also be arranged on the side of the folding shaft 14 close to the first support frame 112 and below the second folding rod 32. The upward bending force of the part of the first support rod 111 and the reinforcing rod 13 on the side of the folding shaft 14 close to the first support frame 112 and the downward bending force of the part of the second support rod 121 on the side of the folding shaft 14 close to the first support frame 112 cause the fixing strip 16 to press against the second support rod 121.
[0042] Referring to Figure 1 and Figure 2 , the first support frame 112, the second support frame 122, the two first support rods 111 and the two second support rods 121 enclose a hollow area 4. A footrest can be provided below the hollow area 4 to increase the riding comfort. When the foldable trolley is used for children to ride, the children can place their feet on the footrest.
[0043] Both the first support frame 112 and the second support frame 122 include a plurality of cross columns 17 and vertical columns 18. The cross columns 17 are fixedly connected between the vertical columns 18. The vertical columns 18 are respectively fixedly connected to the first support rod 111 and the second support rod 121. The reinforcing rod 13 is fixedly connected to a vertical column 18 of the first support rod 111. The number of the cross columns 17 and the vertical columns 18 is not limited, and the load-bearing capacity of the chassis 1 can be increased to a certain extent by increasing the number of the cross columns 17 and the vertical columns 18.
[0044] Referring to Figure 1 andFigure 4 In a folding mode setting, a first folding rod 31 and a second folding rod 32 are provided under the chassis 1. Preferably, the first folding rod 31 and the second folding rod 32 are cross - arranged. The two ends of the first folding rod 31 are respectively rotatably connected to the first vehicle frame 21 and the second vehicle frame 22. Similarly, the two ends of the second folding rod 32 are respectively rotatably connected to the first vehicle frame 21 and the second vehicle frame 22. Here, as a preferred method, the first vehicle frame 21 and the second vehicle frame 22 include several columns 23. Preferably, there are four columns 23, that is, at the four vertices of the rectangular frame of the chassis 1. A sleeve 231 is provided on the column 23. The sleeve 231 can rotate circumferentially around the column 23. The two ends of the first folding rod 31 and the second folding rod 32 are respectively fixedly connected to the sleeve 231. Therefore, the first folding rod 31 and the second folding rod 32 can rotate around the column 23 as the axis.
[0045] The first folding rod 31 includes a first folding arm 311 and a second folding arm 312. One end of the first folding arm 311 is rotatably connected to the column 23 of the first vehicle frame 21 through the sleeve 231. One end of the second folding arm 312 is rotatably connected to the column 23 of the second vehicle frame 22 through the sleeve 231. The other end of the first folding arm 311 is rotatably connected to the other end of the second folding arm 312. Similarly, the second folding rod 32 includes a third folding arm 321 and a fourth folding arm 322. One end of the third folding arm 321 is rotatably connected to the column 23 of the first vehicle frame 21 through the sleeve 231. One end of the fourth folding arm 322 is rotatably connected to the column 23 of the second vehicle frame 22 through the sleeve 231. The other end of the third folding arm 321 is rotatably connected to the other end of the fourth folding arm 322. The rotational connection mode between the first folding arm 311 and the second folding arm 312 and the rotational connection mode between the third folding arm 321 and the fourth folding arm 322 are preferably bolt connections. Preferably, the third folding arm 321 presses on the first folding arm 311, and the second folding arm 312 presses on the fourth folding arm 322. This cross - arrangement makes the folding trajectories of the first folding rod 31 and the second folding rod 32 not affect each other during folding. Therefore, the utilization rate of space can be effectively improved.
[0046] Refer to Figure 5 and Figure 6, a protective sleeve 33 is provided at the connection of the first folding arm 311 and the second folding arm 312 and at the connection of the third folding arm 321 and the fourth folding arm 322. The protective sleeve 33 is fixed to the connection of the first folding arm 311 and the second folding arm 312 and at the connection of the third folding arm 321 and the fourth folding arm 322 by bolts. The protective sleeve 33 is stuck at both ends of the bolts, which can make the bolt connection more firm to a certain extent. The protective sleeve 33 seals the connection and can prevent water, dust, etc. from entering the folding arm 36, thereby preventing the folding arm 36 and the bolts from rusting when exposed to water. On the other hand, the protective sleeve 33 also plays a certain aesthetic role. When folding, the first support rod 111 and the second support rod 121 rotate around the folding shaft 14, the first support frame 112 and the second support frame 122 approach each other, the connection of the first folding arm 311 and the second folding arm 312 is away from the connection of the third folding arm 321 and the fourth folding arm 322, and the first vehicle frame 21 and the second vehicle frame 22 approach each other.
[0047] Referring to Figure 7 and Figure 8 , as a setting of another folding method, a third folding rod 34 and a fourth folding rod 35 are provided between the first vehicle frame 21 and the second vehicle frame 22. Both ends of the third folding rod 34 and the fourth folding rod 35 are rotatably connected to the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22 respectively. The third folding rod 34 and the fourth folding rod 35 rotate in the vertical plane where the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22 are located. Both the third folding rod 34 and the fourth folding rod 35 have a plurality of folding arms 36. The adjacent folding arms 36 of the third folding rod 34 are rotatably connected to each other, and the adjacent folding arms 36 of the fourth folding rod 35 are rotatably connected to each other. The folding arms 36 of the third folding rod 34 and the fourth folding rod 35 are arranged in a crossed manner, and the crossing points of the folding arms 36 of the third folding rod 34 and the fourth folding rod 35 are rotatably connected. Therefore, the adjacent folding arms 36 of the third folding rod 34 and the adjacent folding arms 36 of the fourth folding rod 35 enclose a parallelogram mechanism. Obviously, there are two sets of the third folding rod 34 and the fourth folding rod 35, and the two sets of the third folding rod 34 and the fourth folding rod 35 are arranged in parallel and are respectively located on both sides of the chassis 1. When folding, the crossing points of the folding arms 36 of the two sets of the third folding rod 34 and the folding arms 36 of the fourth folding rod 35 approach each other, the rotational connection points of the adjacent folding arms 36 of the two sets of the third folding rod 34 and the rotational connection points of the adjacent folding arms 36 of the fourth folding rod 35 are away from each other, and the first vehicle frame 21 and the second vehicle frame 22 gradually approach each other.
[0048] Referring to Figure 9 and Figure 10, in the setting of the third folding method, a fifth folding rod 37 and a sixth folding rod 38 are provided between the first vehicle frame 21 and the second vehicle frame 22. The two ends of the fifth folding rod 37 and the sixth folding rod 38 are respectively rotatably connected to the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22. The fifth folding rod 37 and the sixth folding rod 38 rotate in the vertical plane where the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22 are located. The fifth folding rod 37 has two folding arms 36. One ends of the two folding arms 36 of the fifth folding rod 37 are rotatably connected. The other ends of the two folding arms 36 of the fifth folding rod 37 are respectively rotatably connected to the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22. The sixth folding rod 38 includes two parallel arms 39 and two folding arms 36. The two parallel arms 39 of the sixth folding rod 38 are arranged parallel to the first support rod 111 and are on the same horizontal line. One ends of the two parallel arms 39 of the sixth folding rod 38 are respectively rotatably connected to the columns 23 of the first vehicle frame 21 and the columns 23 of the second vehicle frame 22. The other ends of the two parallel arms 39 of the sixth folding rod 38 are respectively rotatably connected to one ends of the two folding arms 36 of the sixth folding rod 38. The other ends of the two folding arms 36 of the sixth folding rod 38 are rotatably connected. The folding arms 36 of the fifth folding rod 37 and the folding arms 36 of the sixth folding rod 38 are arranged in a cross manner, and the intersection of the folding arms 36 of the fifth folding rod 37 and the folding arms 36 of the sixth folding rod 38 is rotatably connected. The two folding arms 36 of the fifth folding rod 37 and the two folding arms 36 of the sixth folding rod 38 enclose a parallelogram mechanism. Obviously, two sets of the fifth folding rod 37 and the sixth folding rod 38 are provided, and the two sets of the fifth folding rod 37 and the sixth folding rod 38 are arranged in parallel and are respectively located on both sides of the chassis 1. When folding, the rotation connection points of the two folding arms 36 of the two sets of the fifth folding rod 37 and the rotation connection points of the two folding arms 36 of the sixth folding rod 38 approach each other, and the intersections of the folding arms 36 of the two sets of the fifth folding rod 37 and the folding arms 36 of the sixth folding rod 38 move away from each other. At the same time, the two parallel arms 39 of the two sets of the sixth folding rod 38 also rotate, making the first vehicle frame 21 and the second vehicle frame 22 approach each other.
[0049] Unless otherwise specified, the rotation connection described in the embodiments of the present application can be achieved by means such as rivet connection or bolt connection. Unless otherwise specified, the fixed connection described in the embodiments of the present application can be achieved by means such as welding or bolt fixing.
[0050] The implementation principle of a foldable trolley according to an embodiment of the present application is as follows: A reinforcing rod 13 is provided at the connection of the first support rod 111 and the second support rod 121. One end of the reinforcing rod 13 is fixed to the first support frame 112, and the other end of the reinforcing rod 13 is coaxially connected to the first support rod 111 and the second support rod 121, that is, both are rotated around the folding axis 14. The reinforcing rod 13 is relatively fixed to the first support rod 111, and the connection strength with the first support rod 111 is enhanced through the fixing block 15 and the fixing strip 16. At the same time, when the first support rod 111 and the second support rod 121 are subjected to a downward pressure, the fixing strip 16 presses against the second support rod 121, so as to reduce the situation that the first support rod 111 and the second support rod 121 are bent downward. Therefore, the setting of the reinforcing rod 13 can increase the connection strength at the folding part of the chassis 1.
[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A foldable trolley, comprising a chassis (1), a first frame (21) and a second frame (22) located on both sides of the chassis (1), characterized in that, The chassis (1) includes: Two first support rods (111), one end of each of the two first support rods (111) is rotatably connected to the first vehicle frame (21); Two second support rods (121), one end of each of the two second support rods (121) is rotatably connected to the second vehicle frame (22); A first support frame (112), the first support frame (112) is fixed between the two first support rods (111); A second support frame (122), the second support frame (122) is fixed between the two second support rods (121); A strengthening rod (13), one end of the strengthening rod (13) is fixed on the first support frame (112), one end of the second support rod (121) is rotatably connected to the first support rod (111) and the strengthening rod (13) at the same time, the rotation point of the second support rod (121) and the strengthening rod (13) is coaxial with the rotation point of the second support rod (121) and the first support rod (111), and the second support rod (121) is located between the first support rod (111) and the strengthening rod (13).
2. The foldable trolley according to claim 1, wherein: At the rotation shaft of the first support rod (111) and the strengthening rod (13), there is a fixing strip (16), the fixing strip (16) restricts the connection part of the first support rod (111) and the second support rod (121) from bending downwards, and the fixing strip (16) is fixedly connected to the first support rod (111) and the strengthening rod (13).
3. The foldable trolley according to claim 1, characterized in that: There is a fixing block (15) between the first support rod (111) and the strengthening rod (13), and the fixing block (15) is fixedly connected to the first support rod (111) and the strengthening rod (13).
4. The foldable trolley according to claim 1, wherein: The first support frame (112), the second support frame (122), the two first support rods (111) and the two second support rods (121) enclose a hollow area (4).
5. The foldable trolley according to claim 1, wherein: The first support frame (112) includes a plurality of cross columns (17) and vertical columns (18), the cross columns (17) are fixedly connected between the vertical columns (18), the vertical columns (18) are fixedly connected to the first support rod (111), and the strengthening rod (13) is fixedly connected to the vertical columns (18).
6. The foldable trolley according to claim 1, characterized in that: A first folding rod (31) and a second folding rod (32) are provided under the chassis (1). The first folding rod (31) and the second folding rod (32) are arranged in a cross manner. The first folding rod (31) has a first folding arm (311) and a second folding arm (312). One end of the first folding arm (311) is rotatably connected to the first vehicle frame (21), and one end of the second folding arm (312) is rotatably connected to the second vehicle frame (22). The other end of the first folding arm (311) is rotatably connected to the other end of the second folding arm (312). The second folding rod (32) has a third folding arm (321) and a fourth folding arm (322). One end of the third folding arm (321) is rotatably connected to the first vehicle frame (21), and one end of the fourth folding arm (322) is rotatably connected to the second vehicle frame (22). The other end of the third folding arm (321) is rotatably connected to the other end of the fourth folding arm (322).
7. The foldable trolley according to claim 6, wherein: The third folding arm (321) presses on the first folding arm (311), and the second folding arm (312) presses on the fourth folding arm (322).
8. The foldable trolley according to claim 6, characterized in that: A protective sleeve (33) is provided at the connection of the first folding arm (311) and the second folding arm (312), and the protective sleeve (33) seals the connection of the first folding arm (311) and the second folding arm (312).
9. The foldable trolley according to claim 1, wherein: A third folding rod (34) and a fourth folding rod (35) are provided between the first vehicle frame (21) and the second vehicle frame (22). One end of the third folding rod (34) and the fourth folding rod (35) are respectively rotatably connected to the first vehicle frame (21), and the other ends of the third folding rod (34) and the fourth folding rod (35) are respectively rotatably connected to the second vehicle frame (22). The third folding rod (34) and the fourth folding rod (35) have a plurality of folding arms (36). The adjacent folding arms (36) of the third folding rod (34) are rotatably connected to each other, and the adjacent folding arms (36) of the fourth folding rod (35) are rotatably connected to each other. The folding arms (36) of the third folding rod (34) and the folding arms (36) of the fourth folding rod (35) are arranged in a cross manner, and the intersection of the folding arms (36) of the third folding rod (34) and the folding arms (36) of the fourth folding rod (35) is rotatably connected.
10. The foldable trolley according to claim 1, characterized in that: A fifth folding rod (37) and a sixth folding rod (38) are provided between the first vehicle frame (21) and the second vehicle frame (22). The fifth folding rod (37) has two folding arms (36). One ends of the two folding arms (36) of the fifth folding rod (37) are rotatably connected. The other ends of the two folding arms (36) of the fifth folding rod (37) are respectively rotatably connected to the first vehicle frame (21) and the second vehicle frame (22). The sixth folding rod (38) includes two parallel arms (39) and two folding arms (36). One ends of the two parallel arms (39) of the sixth folding rod (38) are respectively rotatably connected to the first vehicle frame (21) and the second vehicle frame (22). The other ends of the two parallel arms (39) of the sixth folding rod (38) are respectively rotatably connected to one ends of the two folding arms (36) of the sixth folding rod (38). The other ends of the two folding arms (36) of the sixth folding rod (38) are rotatably connected. The folding arms (36) of the fifth folding rod (37) and the folding arms (36) of the sixth folding rod (38) are arranged in a crossed manner, and the crossing points of the folding arms (36) of the fifth folding rod (37) and the folding arms (36) of the sixth folding rod (38) are rotatably connected.