Folding frame

Abstract

The utility model relates to the technical field of carts, in particular to a folding frame. The folding bicycle frame comprises a base, a front side frame and a rear side frame, wherein the front side frame and the rear side frame are hinged to the base. Supporting assemblies are arranged between the front side frame and the base and between the rear side frame and the base. The supporting assembly comprises a first supporting rod and a second supporting rod which are hinged to each other, the end, away from the second supporting rod, of the first supporting rod is hinged to the base, and the end, away from the first supporting rod, of the second supporting rod is hinged to the front side frame or the rear side frame. A first rotation stopping table is arranged on the first supporting rod, a second rotation stopping table is arranged on the second supporting rod, and when the first supporting rod and the second supporting rod rotate to be coaxial, the first rotation stopping table abuts against the second rotation stopping table to limit the first supporting rod and the second supporting rod to continue to rotate relatively. The folding bicycle frame can meet the requirement for rapid folding and storage, and has good stability during use.

Description

Technical Field

[0001] The utility model relates to the technical field of trolleys, and particularly relates to a folding frame. Background Art

[0002] A trolley is a handling vehicle pushed and pulled by manpower, also called a camping cart or a cart. It has various types and wide applications. In order to facilitate the storage of the trolley, many trolleys on the market adopt a folding frame to meet the requirements of folding and storage. The common folding frame usually uses two sets of X-shaped cross bars arranged at intervals to connect the front and rear side frames. When storing, only need to make the front side frame and the rear side frame approach each other. Although the above folding frame achieves the purpose of quick storage, during actual use, the front side frame and the rear side frame swing back and forth because it is difficult for the X-shaped cross bars to effectively support them, and the structural stability is poor. Summary of the Utility Model

[0003] To solve the problem of poor structural stability of the existing folding frame, the utility model provides a folding frame, which can not only meet the requirements of quick folding and storage, but also has good stability during use.

[0004] The utility model provides a folding frame, which includes a base, a front side frame and a rear side frame hinged to the base. Support components are arranged between the front side frame and the base, and between the rear side frame and the base respectively;

[0005] The support component includes a first rod and a second rod hinged to each other. One end of the first rod away from the second rod is hinged to the base, and one end of the second rod away from the first rod is hinged to the front side frame or the rear side frame;

[0006] A first anti-rotation platform is arranged on the first rod, and a second anti-rotation platform is arranged on the second rod. When the first rod and the second rod rotate to the coaxial line, the first anti-rotation platform and the second anti-rotation platform abut against each other to limit the first rod and the second rod from continuing to rotate relative to each other.

[0007] Optionally, the base includes a front bottom frame and a rear bottom frame hinged to each other. The front side frame is hinged to the front side of the front bottom frame, and the rear side frame is hinged to the rear side of the rear bottom frame. A third anti-rotation platform is arranged on the front bottom frame, and a fourth anti-rotation platform is arranged on the rear bottom frame. When the front bottom frame and the rear bottom frame rotate to the coplanar, the third anti-rotation platform and the fourth anti-rotation platform abut against each other to limit the front bottom frame and the rear bottom frame from continuing to rotate relative to each other; the first rod for supporting the front side frame is hinged to the front bottom frame, and the first rod for supporting the rear side frame is hinged to the rear bottom frame.

[0008] Optionally, a first reinforcement component is provided between the front bottom frame and the rear bottom frame. The first reinforcement component includes a first positioning rod and a first movable rod. The first positioning rod is fixedly installed at the bottom of the front side frame. One end of the first movable rod is hinged to the first positioning rod, and the other end of the first movable rod is hinged to the rear bottom frame.

[0009] Optionally, the first reinforcement component further includes a first positioning roller. The first positioning roller is rotatably installed at the hinge joint between the front bottom frame and the rear bottom frame. The first movable rod is movably abutted against the first positioning roller.

[0010] Optionally, a second reinforcement component is provided between the front bottom frame and the rear bottom frame. The second reinforcement component includes a second positioning rod and a second movable rod. The second positioning rod is fixedly installed at the bottom of the rear side frame. One end of the second movable rod is hinged to the second positioning rod, and the other end of the second movable rod is hinged to the front bottom frame.

[0011] Optionally, the second reinforcement component further includes a second positioning roller. The second positioning roller is rotatably installed at the hinge joint between the front bottom frame and the rear bottom frame. The second movable rod is movably abutted against the second positioning roller.

[0012] Optionally, the folding frame further includes an extension frame. One side of the extension frame is hinged to the bottom of the rear side frame and has two states: a retracted state and an extended state. When the extension frame is in the retracted state, the extension frame is stuck inside the rear side frame. When the extension frame is in the extended state, the extension frame horizontally extends behind the base, and the second positioning rod is received below the extension frame to prevent the extension frame from flipping downward.

[0013] Optionally, a pull rope is provided between the extension frame and the rear side frame. When the extension frame is in the extended state, the pull rope is in a tensioned state to limit the extension frame from flipping downward.

[0014] Optionally, a positioning piece is provided at the hinge joint between the rear side frame and the second support rod. One side of the positioning piece is clamped between the rear side frame and the second support rod, and a positioning hole for fixing the pull rope is provided on the other side of the positioning piece.

[0015] Optionally, both the front side frame and the rear side frame include an upper horizontal rod, a lower horizontal rod, vertical columns connected to the upper horizontal rod at intervals, and sleeves connected to the lower horizontal rod at intervals and sleeved outside the columns for the columns to slide vertically. A locking sleeve for fixing the columns is provided between the sleeve and the column.

[0016] The folding frame in the present utility model has the following beneficial effects:

[0017] 1. The utility model makes the first support rod and the second support rod maintain the same axis by the abutment of the first anti-rotation platform and the second anti-rotation platform, thereby supporting the front frame and the rear frame, reducing the situation of the front and rear swing of the two side frames, and improving the structural stability during the use of the vehicle frame; when storage is required, only reverse rotation of the first support rod and the second support rod to separate the two anti-rotation platforms can fold and store the front frame and the rear frame in opposite directions, meeting the requirements of rapid folding and storage of the vehicle frame; in addition, the utility model eliminates the design of X-shaped cross bars, facilitating the lateral loading and unloading of storage boxes and the like directly from the left and right sides of the vehicle frame without excessively raising the storage box, and improving the loading and unloading efficiency to a certain extent.

[0018] 2. Through the settings of the front bottom frame and the rear bottom frame, the base of the utility model can achieve further folding and storage of the base, reducing the size of the folded vehicle frame. At the same time, due to the settings of the third anti-rotation platform and the fourth anti-rotation platform, the structural stability of the base during use is ensured.

[0019] 3. Through the settings of the first reinforcement component and the second reinforcement component, the utility model can respectively strengthen the front frame and the rear frame, further improving the structural stability during the use of the vehicle frame.

[0020] 4. Through the setting of the extension frame, the utility model increases the load-bearing area of the vehicle frame, and then cooperates with the second reinforcement component to strengthen the extension frame, enabling the second reinforcement component to effectively play a supporting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the folding vehicle frame in the unfolded and used state according to an embodiment of the utility model Figure 1 。

[0022] Figure 2 is a structural schematic diagram of the folding vehicle frame in the unfolded and used state according to an embodiment of the utility model Figure 2 。

[0023] Figure 3 is a structural schematic diagram of the folding vehicle frame in the folded and stored state according to an embodiment of the utility model.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS:

[0025] 1. Base; 11. Front bottom frame; 111. Third anti-rotation platform; 12. Rear bottom frame; 121. Fourth anti-rotation platform; 13. Cross bar; 14. First connecting rod; 2. Front side frame; 21. Upper cross bar; 22. Lower cross bar; 23. Column; 24. Sleeve; 25. Locking sleeve; 26. Second connecting rod; 27. Bracing rod; 3. Rear side frame; 31. Pulling rope; 32. Positioning piece; 321. Positioning hole; 4. Pull rod; 5. Wheel; 6. Support assembly; 61. First support rod; 611. First anti-rotation platform; 62. Second support rod; 621. Second anti-rotation platform; 7. First reinforcement assembly; 71. First positioning rod; 72. First movable rod; 73. First positioning roller; 8. Second reinforcement assembly; 81. Second positioning rod; 82. Second movable rod; 83. Second positioning roller; 9. Extension frame. Detailed implementation manners

[0026] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description will be given to the specific embodiments of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0028] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this application is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the drawings of the embodiments of the present utility model, a coordinate system XYZ is provided, where the positive direction of the X-axis represents the left side, the negative direction of the X-axis represents the right side, the positive direction of the Y-axis represents the front side, the negative direction of the Y-axis represents the rear side, the positive direction of the Z-axis represents the upper side, and the negative direction of the Z-axis represents the lower side.

[0031] It should be noted that, without conflict, the features in the embodiments of the present utility model can be combined with each other.

[0032] The embodiments of the present utility model provide a folding frame, which combines Figure 1 , Figure 2 , Figure 3 As shown, it includes a base 1, a front side frame 2 and a rear side frame 3 hinged to the base 1, a pull rod 4, and wheels 5. Support assemblies 6 are provided between the front side frame 2 and the base 1, and between the rear side frame 3 and the base 1. Thus, it can not only meet the requirement that the frame can be quickly folded and stored, but also have good stability during use.

[0033] Among them, the number of the support assemblies 6 can be one group, two groups, three groups, etc. In order to balance stability and the loading and unloading efficiency of the carried items in this application, four groups of support assemblies 6 are preferably provided. Two groups of support assemblies 6 are spaced between the front side frame 2 and the base 1 to support the front side frame 2, and the other two groups of support assemblies 6 are provided between the rear side frame 3 and the base 1 to support the rear side frame 3.

[0034] Each group of support assemblies 6 includes a first strut 61 and a second strut 62 that are hinged to each other. One end of the first strut 61 away from the second strut 62 is hinged to the base 1, and one end of the second strut 62 away from the first strut 61 is hinged to the front side frame 2 or the rear side frame 3. That is, the second strut 62 in the support assembly 6 for supporting the front side frame 2 is hinged to the front side frame 2, and the second strut 62 in the support assembly 6 for supporting the rear side frame 3 is hinged to the rear side frame 3. A first anti-rotation platform 611 is provided on the first strut 61, and a second anti-rotation platform 621 is provided on the second strut 62. When the first strut 61 and the second strut 62 rotate to the coaxial line, the first anti-rotation platform 611 and the second anti-rotation platform 621 abut against each other to limit the further relative rotation of the first strut 61 and the second strut 62.

[0035] When the folding frame is unfolded for use, the front side frame 2 is folded forward to the vertical state, and at the same time the rear side frame 3 is folded backward to the vertical state. This vertical state is the state when the frame surfaces of the front and rear side frames are parallel to the XZ plane. At this time, the first rod 61 and the second rod 62 in each set of support components 6 are coaxial, thus forming an integrated "support rod". The four sets of support rods respectively support at the four corners of the folding frame, and respectively support the front side frame 2 and the rear side frame 3, effectively reducing the situation of the front side frame 2 and the rear side frame 3 swinging back and forth, and improving the structural stability during the use of the frame. When the folding frame is folded and stored, only the first rod 61 and the second rod 62 are folded in half around their hinge point, and the front side frame 2 can be folded backward to the horizontal state, and the rear side frame 3 is synchronously folded forward to the horizontal state. This horizontal state is the state when the frame surfaces of the front and rear side frames are parallel to the XY plane. At this time, the first rod 61 and the second rod 62 in each set of support components 6 rotate to be parallel to each other, so that the front side frame 2 and the rear side frame 3 rotate and fold towards the bottom frame.

[0036] Optionally, the base 1 includes a front bottom frame 11 and a rear bottom frame 12 that are hinged to each other. The front side frame 2 is hinged to the front side of the front bottom frame 11, and the rear side frame 3 is hinged to the rear side of the rear bottom frame 12. The front bottom frame 11 is provided with a third anti-rotation platform 111, and the rear bottom frame 12 is provided with a fourth anti-rotation platform 121. When the front bottom frame 11 and the rear bottom frame 12 rotate to be coplanar, the front bottom frame 11 and the rear bottom frame 12 are both in the horizontal state (parallel to the XY plane), and the third anti-rotation platform 111 and the fourth anti-rotation platform 121 abut against each other to limit the relative rotation of the front bottom frame 11 and the rear bottom frame 12; the first rod 61 for supporting the front side frame 2 is hinged to the front bottom frame 11, and the first rod 61 for supporting the rear side frame 3 is hinged to the rear bottom frame 12. When folding and storing is required, the front bottom frame 11 and the rear bottom frame 12 are folded relative to each other so that their hinge point is located above, so that the front side frame 2 and the rear side frame 3 correspondingly sandwich the front bottom frame 11 and the rear bottom frame 12 in the middle, which can not only reduce the volume of the folding frame after storage to a certain extent, but also help improve the efficiency of folding, storing and unfolding the folding frame.

[0037] Optionally, the frame structures of the front bottom frame 11 and the rear bottom frame 12 can be adjusted as needed. In the drawings of this embodiment, it is specifically composed of two cross bars 13 and a plurality of first connecting rods 14 arranged in parallel between the two cross bars 13. Its structure is simple and stable, and can play a good supporting role.

[0038] In order to further increase the structural stability of the front bottom frame 11 and the rear bottom frame 12 during the use of the folding frame, one or both of the first reinforcement component 7 and the second reinforcement component 8 can be provided between the front bottom frame 11 and the rear bottom frame 12 of this embodiment as needed.

[0039] Among them, the first reinforcement component 7 includes a first positioning rod 71 and a first movable rod 72. The first positioning rod 71 is fixedly installed at the bottom of the front side frame 2. One end of the first movable rod 72 is hinged to the first positioning rod 71, and the other end of the first movable rod 72 is hinged to the cross bar 13 of the rear bottom frame 12. When the folding frame is in the unfolded and in-use state, the rear bottom frame 12 gives a supporting force to the first movable rod 72, and then through the first positioning rod 71, it acts on the bottom of the front side frame 2, making the front side frame 2 have a tendency to rotate and fold backward. This tendency counteracts the second support rod 62 acting on the front side frame 2, thereby enabling the first support rod 61 to better play a supporting role and further increasing the structural stability of the front side frame 2.

[0040] Similarly, the second reinforcement component 8 includes a second positioning rod 81 and a second movable rod 82. The second positioning rod 81 is fixedly installed at the bottom of the rear side frame 3. One end of the second movable rod 82 is hinged to the second positioning rod 81, and the other end of the second movable rod 82 is hinged to the front bottom frame 11. Correspondingly, when the folding frame is in the unfolded and in-use state, the front bottom frame 11 gives a supporting force to the second movable rod 82, and then through the second positioning rod 81, it acts on the bottom of the rear side frame 3, making the rear side frame 3 have a tendency to rotate and fold forward. This tendency counteracts the second support rod 62 acting on the rear side frame 3, thereby enabling the first support rod 61 to better play a supporting role and further increasing the structural stability of the rear side frame 3.

[0041] Optionally, the first reinforcement component 7 further includes a first positioning roller 73, and the second reinforcement component 8 further includes a second positioning roller 83. The first positioning roller 73 is rotatably installed at the hinge joint of the front bottom frame 11 and the rear bottom frame 12, and the first movable rod 72 is movably abutted against the lower roller surface of the first positioning roller 73; the second positioning roller 83 is rotatably installed at the hinge joint of the front bottom frame 11 and the rear bottom frame 12, and the second movable rod 82 is movably abutted against the lower roller surface of the second positioning roller 83. Thus, when the folding frame is unfolded and in use, the first positioning roller 73 limits the first movable rod 72, and the second positioning roller 83 limits the second movable rod 82, preventing the first movable rod 72 and the second movable rod 82 from moving upward. When the folding frame is folded and stored, the first movable roller can also provide a guiding function for the first movable rod 72, and the second movable roller correspondingly provides a guiding function for the second movable rod 82, enabling the first movable rod 72 and the first positioning rod 71 and the second movable rod 82 and the second positioning rod 81 to rotate and fold smoothly correspondingly.

[0042] Optionally, the folding frame of this embodiment further includes an extension frame 9. One side of the extension frame 9 is hinged to the bottom of the rear side frame 3 and has two states: retracted and deployed. When the extension frame 9 is in the retracted state, the extension frame 9 is stuck inside the rear side frame 3, that is, the extension frame 9 is in a vertical state, thereby reducing the impact of the extension frame 9 on the volume of the folded frame after storage. When the extension frame 9 is in the deployed state, the extension frame 9 extends horizontally at the rear side of the base 1, which can effectively increase the bearing surface of the folding frame. The second positioning rod 81 then supports below the extension frame 9 to prevent the extension frame 9 from flipping downward. Thus, the extension frame 9 has good structural stability, and the second positioning rod 81 serves two purposes with one object.

[0043] Optionally, a pulling rope 31 is provided between the extension frame 9 and the rear side frame 3. One end of the pulling rope is connected to the middle of the rear side frame 3, and the other end of the pulling rope is connected to the extension frame 9 away from its hinge with the rear bottom frame 12. When the extension frame 9 is in the deployed state, the pulling rope 31 is in a taut state to limit the extension frame 9 from flipping downward. When the item placed on the extension frame 9 is heavy, the pulling rope can provide an upward pulling force to the extension frame 9, further increasing the bearing capacity of the extension frame 9.

[0044] Optionally, a positioning piece 32 is provided at the hinge of the rear side frame 3 and the second support rod 62. One side of the positioning piece 32 is clamped between the rear side frame 3 and the second support rod 62, and a positioning hole 321 for fixing the pulling rope 31 is provided on the other side of the positioning piece 32. Thus, on the one hand, the positioning piece 32 can provide a buffer for the hinge of the second support rod 62 and the rear side frame 3, reducing the wear generated when the second support rod 62 and the rear side frame 3 rotate relative to each other; on the other hand, it can reduce the connecting components between the second support rod 62, the pulling rope 31, and the rear side frame 3, improving the assembly efficiency of the folding frame. Correspondingly, this embodiment can also be provided with a corresponding positioning piece 32 at the connection of the front side frame 2 and the corresponding second support rod 62 to reduce the wear between the front side frame 2 and the second support rod 62.

[0045] Optionally, the frame structures of the front side frame 2 and the rear side frame 3 can be adjusted as needed. In the drawings of this embodiment, both the front side frame 2 and the rear side frame 3 include an upper cross bar 21, a lower cross bar 22, vertical columns 23 connected to the upper cross bar 21 at intervals, and sleeves 24 connected to the lower cross bar 22 at intervals and sleeved outside the vertical columns 23 for the vertical columns 23 to slide vertically. A locking sleeve 25 for fixing the vertical columns 23 is provided between the sleeves 24 and the vertical columns 23. Thus, the distance between the upper cross bar 21 and the lower cross bar 22 can be adjusted by adjusting the length of the vertical columns 23 extending out of the sleeves 24 to meet the different height requirements of the folding frame. In this embodiment, there are specifically two sleeves 24, and two second connecting rods 26 are also provided between the two sleeves 24, and the second connecting rods 26 can further increase the structural stability between the sleeves 24.

[0046] The front frame 2 and the rear frame 3 of this embodiment further include a plurality of vertically arranged abutting rods 27, specifically shown as two in the figure. One end of the abutting rod 27 is connected to the lower crossbar, and the other end extends downwardly below the lower crossbar. Among them, the abutting rod 27 of the front frame 2 is connected to the first positioning rod 71, and the abutting rod 27 of the rear frame 3 is connected to the second positioning rod 81, so as to ensure the stabilizing effect of the first reinforcement assembly 7 on the front frame 2 and the second reinforcement assembly on the rear frame 3.

[0047] In order to further increase the structural compactness and reduce the number of components, the pull rod 4 in this embodiment is joined at the middle of the lower crossbar, and the four wheels 5 are correspondingly connected to the four abutting rods 27, thereby improving the pulling efficiency and assembly efficiency of the folding frame. The connection method between the wheel 5 and the abutting rod 27 can be adjusted as needed, including but not limited to snap connection, plug connection, bolt connection, etc. In this embodiment, it is specifically shown as plug fixation.

[0048] The implementation principle of this embodiment is as follows:

[0049] When the folding frame is unfolded for use, in combination with Figure 2 , the front frame 2 is folded forward to the vertical state, and simultaneously the rear frame 3 is folded backward to the vertical state. The four groups of support rods are correspondingly rotated to form four "support rods" respectively supporting at the four corners of the folding frame, respectively supporting the front frame 2 and the rear frame 3; combined with the first reinforcement assembly 7 and the second reinforcement assembly 8 respectively forming a counteraction against the second support rod 62 on the front frame 2 and the rear frame 3, effectively reducing the situation of the front frame 2 and the rear frame 3 swinging back and forth, and improving the structural stability during the use of the frame.

[0050] When the folding frame is folded and stored, in combination with Figure 3 , the first support rod 61 and the second support rod 62 are folded in half with their hinge point as the center. The front frame 2 can be folded backward, and the rear frame 3 is simultaneously folded forward. At the same time, the front bottom frame 11 and the rear bottom frame 12 are folded relative to each other, so that the hinge points of the front frame 2 and the front bottom frame 11 and the rear frame 3 and the rear bottom frame 12 are located below, and the hinge point of the front bottom frame 11 and the rear frame 3 is located above, presenting an overall "W"-shaped fold, which not only has a small storage volume, but also has a high folding storage and unfolding use efficiency.

[0051] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A folding frame, comprising a base (1) and a front side frame (2) and a rear side frame (3) hinged to the base (1), characterized in that: A support assembly (6) is provided between the front side frame (2) and the base (1), and between the rear side frame (3) and the base (1); The support assembly (6) comprises a first support rod (61) and a second support rod (62) which are hinged to each other, wherein one end of the first support rod (61) away from the second support rod (62) is hinged to the base (1), and one end of the second support rod (62) away from the first support rod (61) is hinged to the front side frame (2) or the rear side frame (3); The first support rod (61) is provided with a first anti-rotation platform (611), and the second support rod (62) is provided with a second anti-rotation platform (621). When the first support rod (61) and the second support rod (62) rotate to a coaxial line, the first anti-rotation platform (611) and the second anti-rotation platform (621) abut against each other to limit the first support rod (61) and the second support rod (62) from continuing to rotate relative to each other.

2. The folding frame according to claim 1, characterized in that: The base (1) comprises a front bottom frame (11) and a rear bottom frame (12) which are hinged to each other, the front side frame (2) is hinged to the front side of the front bottom frame (11), and the rear side frame (3) is hinged to the rear side of the rear bottom frame (12); a third anti-rotation platform (111) is provided on the front bottom frame (11), and a fourth anti-rotation platform (121) is provided on the rear bottom frame (12); when the front bottom frame (11) and the rear bottom frame (12) rotate to be coplanar, the third anti-rotation platform (111) and the fourth anti-rotation platform (121) abut against each other to limit the front bottom frame (11) and the rear bottom frame (12) from continuing to rotate relative to each other; a first support rod (61) for supporting the front side frame (2) is hinged to the front bottom frame (11), and the first support rod (61) for supporting the rear side frame (3) is hinged to the rear bottom frame (12).

3. The folding frame according to claim 2, characterized in that: A first reinforcement component (7) is provided between the front bottom frame (11) and the rear bottom frame (12), the first reinforcement component (7) comprising a first positioning rod (71) and a first movable rod (72), the first positioning rod (71) being fixedly mounted on the bottom of the front side frame (2), one end of the first movable rod (72) being hinged to the first positioning rod (71), and the other end of the first movable rod (72) being hinged to the rear bottom frame (12).

4. The folding frame according to claim 3, characterized in that: The first reinforcement component (7) further comprises a first positioning roller (73), the first positioning roller (73) being rotatably mounted at the hinge between the front bottom frame (11) and the rear bottom frame (12), and the first movable rod (72) being movably abutted against the first positioning roller (73).

5. The folding frame according to claim 2, characterized in that: A second reinforcement component (8) is provided between the front bottom frame (11) and the rear bottom frame (12), the second reinforcement component (8) comprising a second positioning rod (81) and a second movable rod (82), the second positioning rod (81) being fixedly mounted on the bottom of the rear side frame (3), one end of the second movable rod (82) being hinged to the second positioning rod (81), and the other end of the second movable rod (82) being hinged to the front bottom frame (11).

6. The folding frame according to claim 5, characterized in that: The second reinforcement assembly (8) further comprises a second positioning roller (83), the second positioning roller (83) being rotatably mounted at the hinge between the front bottom frame (11) and the rear bottom frame (12), and the second movable rod (82) being movably abutted against the second positioning roller (83).

7. The folding frame according to claim 5, characterized in that: It also includes an extension frame (9), one side of which is hinged to the bottom of the rear side frame (3) and has two states: folded and unfolded; when the extension frame (9) is in the folded state, the extension frame (9) is stuck in the rear side frame (3); when the extension frame (9) is in the unfolded state, the extension frame (9) extends horizontally to the rear side of the base (1), and the second positioning rod (81) is supported below the extension frame (9) to prevent the extension frame (9) from turning downward.

8. The folding frame according to claim 7, characterized in that: A pull rope (31) is provided between the extension frame (9) and the rear side frame (3); when the extension frame (9) is in an unfolded state, the pull rope (31) is in a tightened state to restrict the extension frame (9) from turning downward.

9. The folding frame according to claim 8, characterized in that: A positioning piece (32) is provided at the hinge between the rear side frame (3) and the second support rod (62); one side of the positioning piece (32) is clamped between the rear side frame (3) and the second support rod (62); and the other side of the positioning piece (32) is provided with a positioning hole (321) for fixing the pull rope (31).

10. The folding frame according to claim 1, characterized in that: The front side frame (2) and the rear side frame (3) both comprise an upper transverse rod (21), a lower transverse rod (22), a column (23) vertically spaced apart and connected to the upper transverse rod (21), and a sleeve (24) vertically spaced apart and sleeved on the outside of the column (23) to allow the column (23) to slide vertically, and a locking sleeve (25) for fixing the column (23) is provided between the sleeve (24) and the column (23).

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