frame box
Patent Information
- Application Number
- CN202522392647.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-11
AI Technical Summary
[0002]相关技术中,框架箱具有底架和设置于底架两端的侧架,在货物运输时,需要将侧架立起来以减少侧架的空间占用以及通过立起侧架来防止货物意外掉落出框架箱,然而,现有的框架箱在对侧架的锁定操作较为费力,在频繁的运输中,会对框架箱的使用造成不便
本申请提供的框架箱,在侧架转动至第一位置,转动第一连接杆远离连接座的一端时,第一连接杆转动连接于连接座的一端的位置不变,此时,第一连接杆转动连接于连接座的一端可看作为杠杆的支点,第二连接杆连接于第一连接杆,通过转动第一连接杆可利用杠杆作用以更省力地带动第二连接杆移动,第二连接杆可带动插销移动,从而使得插销插入第一孔和第二孔内,以便于更省力地固定侧架。在转动第一连接杆时,第一连接杆的转动方向实时变化,而插销需要在一个方向上移动,使得第一连接杆的转动方向与插销的移动方向之间存在夹角,转动第一连接杆会将插销拉偏,本申请通过在第一连接杆和插销之间转动连接第二连接杆,可使得第二连接杆可自动适应和调整位置状态,以保证插销在一个方向上移动,进而便于对侧架的位置进行锁定。
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Figure CN224830104U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of transportation technology, and more particularly to a frame box. Background Technology
[0002] In related technologies, flat racks have a base frame and side frames set at both ends of the base frame. When transporting goods, the side frames need to be erected to reduce the space occupied by the side frames and to prevent the goods from accidentally falling out of the flat rack. However, the existing flat racks are relatively difficult to lock the side frames, which will cause inconvenience to the use of the flat racks in frequent transportation. Utility Model Content
[0003] To overcome the problems existing in related technologies, this application provides a frame box.
[0004] According to this application, a frame box is provided, comprising: A base frame that extends along a first direction; A connecting frame is disposed at at least one end of the base frame in a first direction, the connecting frame is connected to the base frame, and the connecting frame is provided with a first hole; A side frame is rotatably connected to the connecting frame, and the side frame is provided with a second hole; A locking component, connected to the connecting frame, the locking component comprising: Connecting base, connected to the connecting frame; A first connecting rod, one end of which is rotatably connected to the connecting seat; A second connecting rod, one end of which is rotatably connected to the first connecting rod; A pin, one end of which is rotatably connected to the other end of the second connecting rod; The side frame has a first position. When the side frame is rotated to the first position, the first hole corresponds to the second hole, and the other end of the pin passes through the first hole and the second hole to fix the side frame.
[0005] In some embodiments of this application, the locking component further includes: A pull rod, one end of which is connected to the other end of the first connecting rod; Under the action of external force, the pull rod pulls the first connecting rod to rotate, the first connecting rod drives the second connecting rod to move, and the second connecting rod drives the pin to move, so that the pin passes through the first hole and the second hole, or is pulled out of the first hole.
[0006] In some embodiments of this application, when the side frame is rotated to the first position, the side frame is set at an angle to the base frame.
[0007] In some embodiments of this application, the side frame has a second position, and when the side frame is rotated to the second position, the end of the side frame away from the connecting frame abuts against the base frame.
[0008] In some embodiments of this application, the connecting frame includes: The connecting part has a third hole, and the side frame has a fourth hole. A connector passes through the third hole and the fourth hole to rotatably connect the side frame and the connecting part.
[0009] In some embodiments of this application, the connecting portion includes a first connecting plate and a second connecting plate spaced apart, both the first connecting plate and the second connecting plate are provided with the third hole, and the portion of the side frame with the fourth hole is provided between the first connecting plate and the second connecting plate.
[0010] In some embodiments of this application, the locking components are respectively provided at opposite ends of the side frame in the second direction, wherein the second direction is perpendicular to the first direction.
[0011] In some embodiments of this application, the frame box further includes: A limiting plate is provided on the connecting frame. The limiting plate has a slot and a first insertion hole. When the pin is inserted into the first hole and the second hole, the pull rod can be placed in the slot. The blocking part has one end rotatably connected to the limiting plate around the card slot, and the other end of the blocking part is provided with a second insertion hole. The other end of the blocking part can be rotated to a position corresponding to the first insertion hole and the second insertion hole to close the opening of the card slot. A connector that is inserted into the first socket and the second socket to restrict the rotation of the blocking part.
[0012] In some embodiments of this application, the point where the second connecting rod is rotatably connected to the first connecting rod is the first point, the point where the first connecting rod is connected to the connecting frame is the second point, the point where the first connecting rod is connected to the pull rod is the third point, and the distance between the first point and the second point is greater than the distance between the first point and the third point.
[0013] In some embodiments of this application, the connecting frame further includes: Top plate, located on top of the connecting frame; A base plate is disposed at the bottom of the connecting frame; At least one support plate, the two ends of which are respectively connected to the top plate and the bottom plate, and at least one support plate is provided with a limiting hole, the limiting hole corresponding to the first hole. When the side frame is rotated to the first position, the other end of the pin passes through the limiting hole, the first hole and the second hole to fix the side frame.
[0014] The technical solutions provided by the embodiments of this application may include the following beneficial effects: The frame box provided in this application, when the side frame is rotated to the first position and the end of the first connecting rod is rotated away from the connecting seat, the position of the end of the first connecting rod rotatably connected to the connecting seat remains unchanged. At this time, the end of the first connecting rod rotatably connected to the connecting seat can be regarded as the fulcrum of a lever. The second connecting rod is connected to the first connecting rod. By rotating the first connecting rod, the lever action can be used to move the second connecting rod with less effort. The second connecting rod can drive the pin to move, so that the pin can be inserted into the first hole and the second hole, so as to fix the side frame with less effort. When rotating the first connecting rod, the rotation direction of the first connecting rod changes in real time, while the pin needs to move in one direction, so that there is an angle between the rotation direction of the first connecting rod and the movement direction of the pin. Rotating the first connecting rod will pull the pin off-center. This application, by rotatably connecting the second connecting rod between the first connecting rod and the pin, allows the second connecting rod to automatically adapt and adjust its position state to ensure that the pin moves in one direction, thereby facilitating the locking of the side frame position.
[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0017] Figure 1 This is a schematic diagram of the first position of the side frame of a frame box according to an exemplary embodiment; Figure 2 This is another schematic diagram showing the first position of the side frame of the frame box according to an exemplary embodiment; Figure 3 yes Figure 2 Enlarged view of section A; Figure 4 This is a schematic diagram of the disassembly of a frame box according to an exemplary embodiment; Figure 5 This is a schematic diagram illustrating the connection between the side frame and the connecting frame according to an exemplary embodiment; Figure 6 yes Figure 5 Enlarged view of section B; Figure 7 This is a schematic diagram of the second position of the side frame of the frame box according to an exemplary embodiment; Figure 8 This is another schematic diagram showing the first position of the side frame of the frame box according to an exemplary embodiment; Figure 9 yes Figure 8 Enlarged view of section C.
[0018] In the diagram: 1. Frame box; 11. Base frame; 12. Connecting frame; 121. Connecting part; 1211. First connecting plate; 1212. Second connecting plate; 1213. Third hole; 1214. First hole; 122. Top plate; 123. Bottom plate; 124. Support plate; 1241. Limiting hole; 1242. Clearance hole; 13. Side frame; 131. Second hole; 132. Fourth hole; 14. Locking assembly; 141. Connecting seat; 142. First connecting rod; 143. Second connecting rod; 144. Pin; 145. Pull rod; 15. Limiting plate; 151. Slot; 16. Blocking part; 17. Connector. Detailed Implementation
[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0020] Flat rack containers have a base frame and side frames. During cargo transportation, the side frames need to be erected to reduce the space occupied by the side frames and to prevent the cargo from accidentally falling out of the flat rack container. However, the existing flat rack containers are relatively laborious to lock the side frames, making the locking operation of the side frames inconvenient.
[0021] To address the aforementioned problems, this application provides a frame box. The locking assembly of the frame box includes: a connecting seat, a first connecting rod, a second connecting rod, and a pin. The connecting seat is connected to a connecting frame; one end of the first connecting rod is rotatably connected to the connecting seat; one end of the second connecting rod is rotatably connected to the first connecting rod; and one end of the pin is rotatably connected to the other end of the second connecting rod. The side frame has a first position. When the side frame is rotated to the first position, the first hole corresponds to the second hole. The other end of the pin passes through the first and second holes to fix the side frame. Rotating the end of the first connecting rod away from the connecting seat can move the second connecting rod and the pin within the first and second holes. The first connecting rod acts as a lever, making the movement of the pin easier and thus facilitating the locking of the side frame.
[0022] One embodiment of this application provides a frame box, such as Figure 1 As shown, the frame box 1 includes a base frame 11, a connecting frame 12, a side frame 13, and a locking assembly 14. The base frame 11 is disposed at the bottom of the frame box 1 and is used to carry goods. The length direction of the base frame 11 is a first direction, and the base frame 11 extends along the first direction. Exemplarily, the first direction is parallel to the horizontal direction, so that the base frame 11 can carry goods on a horizontal surface.
[0023] See Figures 2-6 The connecting frame 12 is disposed at at least one end of the base frame 11 in a first direction and is connected to the base frame 11. The side frame 13 is rotatably connected to the connecting frame 12, that is, the side frame 13 is disposed at at least one end of the base frame 11 in a first direction. By rotating the side frame 13, the side frame 13 can be erected or laid flat. See also Figure 1 The position of side frame 13 when it is erected is the first position of side frame 13. When side frame 13 is erected, it can prevent the goods carried on the frame box 1 from falling out of the frame box 1. See also Figure 7 The position of the side frame 13 when it is flat is the second position of the side frame 13. Flattening the side frame 13 can reduce the space occupied by the side frame 1 in the height direction, making it easier to stack multiple frame boxes 1, thereby reducing the space occupied by the frame boxes 1 in the transportation.
[0024] Locking assembly 14 is connected to connecting frame 12. Locking assembly 14 is used to fix the position of side frame 13. Locking assembly 14 includes connecting seat 141, first connecting rod 142, second connecting rod 143, and pin 144. Connecting seat 141 is connected to connecting frame 12. Exemplarily, connecting seat 141 is fixedly connected to connecting frame 12, and can be connected to connecting frame 12 by fasteners or riveting. One end of first connecting rod 142 is rotatably connected to connecting seat 141, so that the other end of first connecting rod 142 can rotate around connecting seat 141. One end of second connecting rod 143 is rotatably connected to first connecting rod 142, so that when first connecting rod 142 rotates, first connecting rod 142 can drive second connecting rod 143 to move. One end of pin 144 is rotatably connected to the other end of second connecting rod 143, so that when second connecting rod 143 moves, second connecting rod 143 can drive pin 144 to move.
[0025] The connecting frame 12 has a first hole 1214, and the side frame 13 has a second hole 131. When the side frame 13 is rotated to the first position, the first hole 1214 and the second hole 131 correspond to each other. The other end of the pin 144 passes through the first hole 1214 and the second hole 131 to fix the position of the side frame 13.
[0026] In this embodiment, when the side frame 13 is rotated to the first position and the end of the first connecting rod 142 is rotated away from the connecting seat 141, the position of the end of the first connecting rod 142 rotatably connected to the connecting seat 141 remains unchanged. At this time, the end of the first connecting rod 142 rotatably connected to the connecting seat 141 can be regarded as the fulcrum of the lever. The second connecting rod 143 is connected to the first connecting rod 142. By rotating the first connecting rod 142, the lever action can be used to drive the second connecting rod 143 to move with less effort. The second connecting rod 143 can drive the pin 144 to move, so that the pin 144 is inserted into the first hole 1214 and the second hole 131, so as to fix the side frame 13 with less effort. When the first connecting rod 142 is rotated, the rotation direction of the first connecting rod 142 changes in real time, while the pin 144 needs to move in one direction, so that there is an angle between the rotation direction of the first connecting rod 142 and the movement direction of the pin 144. Rotating the first connecting rod 142 will pull the pin 144 off-center. In this embodiment, by rotatably connecting the second connecting rod 143 between the first connecting rod 142 and the pin 144, the second connecting rod 143 can automatically adapt and adjust its position state to ensure that the pin 144 moves in one direction, thereby facilitating the locking of the position of the side frame 13.
[0027] In some embodiments, see Figures 3-6 as well as Figures 8-9 The locking assembly 14 also includes a pull rod 145, one end of which is connected to the other end of the first connecting rod 142. The other end of the first connecting rod 142 is the end of the first connecting rod 142 away from the connecting seat 141. The pull rod 145 serves as a handheld component to facilitate gripping and applying external force by the user. Exemplarily, the connection between the pull rod 145 and the other end of the first connecting rod 142 can be a hinged connection or a welded connection.
[0028] Under external force, the pull rod 145 pulls the first connecting rod 142 to rotate. The first connecting rod 142 drives the second connecting rod 143 to move, and the second connecting rod 143 drives the pin 144 to move, so that the pin 144 passes through the first hole 1214 and the second hole 131 or is withdrawn from the first hole 1214. For example, when the pull rod 145 rotates in opposite directions, it can drive the pin 144 to insert into the first hole 1214 and the second hole 131 or withdraw from the first hole 1214. When the pin 144 is inserted into the first hole 1214 and the second hole 131, it can lock the position of the side frame 13. When the pin 144 is withdrawn from the first hole 1214, the pin 144 no longer locks the position of the side frame 13, and the side frame 13 can be rotated to a suitable position according to actual needs. For example, the side frame 13 can be rotated to a second position in a flat state to reduce the space occupied by the frame box 1.
[0029] In this embodiment, a pull rod 145 is provided so that the user can apply external force to the first connecting rod 142 by holding the pull rod 145, thereby driving the second connecting rod 143 and the pin 144 to move, which makes it easy to operate the pin 144 to lock the side frame 13 or to pull out the pin 144 to adjust the position of the side frame 13.
[0030] In some embodiments, see Figure 1 When the side frame 13 rotates to the first position, it is angled relative to the base frame 11. For example, the plane containing the base frame 11 is parallel to the horizontal plane. When the side frame 13 rotates to the first position, it is angled relative to the base frame 11, allowing it to be either inclined or perpendicular to the horizontal plane. When the angle between the side frame 13 and the base frame 11 is right angled, the side frame 13 is vertical. By angled relative to the base frame 11, the side frame 13 is erected, which helps to block the goods carried on the base frame 11, preventing them from falling out of the frame box 1 due to shaking during transportation.
[0031] In some embodiments, see Figure 7 The side frame 13 has a second position. When the side frame 13 is rotated to the second position, the end of the side frame 13 away from the connecting frame 12 abuts against the base frame 11. At this time, the side frame 13 is roughly flat. Flattening the side frame 13 can reduce the space occupied by the side frame 1 in the height direction, making it easier to stack multiple frame boxes 1, thereby reducing the space occupied by the frame boxes 1 in the transportation.
[0032] In some embodiments, see Figure 6 The connecting frame 12 includes a connecting part 121, the connecting part 121 is provided with a third hole 1213, and the side frame 13 is provided with a fourth hole 132. The side frame 13 and the connecting part 121 are rotatably connected by a connector passing through the third hole 1213 and the fourth hole 132, so that the side frame 13 can rotate relative to the connecting frame 12.
[0033] In some embodiments, see Figure 6 The connecting part 121 includes a first connecting plate 1211 and a second connecting plate 1212, which are spaced apart. Each of the first connecting plate 1211 and the second connecting plate 1212 has a corresponding third hole 1213. An installation space is formed between the first connecting plate 1211 and the second connecting plate 1212. The part of the side frame 13 with a fourth hole 132 is located in the installation space. The connector passes through the third hole 1213 and the fourth hole 132 to rotatably connect the side frame 13 and the connecting part 121. The first connecting plate 1211 and the second connecting plate 1212 can limit and guide the side frame 13 when it rotates, ensuring that the rotation of the side frame 13 is smoother.
[0034] In some embodiments, see Figure 6 and Figure 9 Both the first connecting plate 1211 and the second connecting plate 1212 are provided with a first hole 1214, and the second hole 131 is located close to the fourth hole 132. This design makes the rotation path of the second hole 131 smaller when the side plate rotates around the fourth hole 132, thereby making the space for avoiding the part of the side frame 13 with the second hole 131 smaller, which facilitates the rotation of the side frame 13 and also reduces the size of the frame box 1.
[0035] In some embodiments, locking components 14 are respectively provided at opposite ends of the side frame 13 in the second direction, wherein the second direction is perpendicular to the first direction and parallel to the horizontal direction. The locking components 14 lock the opposite ends of the side frame 13 to improve the reliability of the side frame 13 after the locking components 14 lock the position.
[0036] In some embodiments, see Figure 6 The connecting frame 12 further includes a top plate 122, a bottom plate 123, and at least one support plate 124. The top plate 122 is disposed at the top of the connecting frame 12, and the bottom plate 123 is disposed at the bottom of the connecting frame 12. The support plate 124 is disposed between the top plate 122 and the bottom plate 123, and the two ends of the support plate 124 in the vertical direction are respectively connected to the top plate 122 and the bottom plate 123. Exemplarily, one or more support plates 124 may be provided. When multiple support plates 124 are provided, the multiple support plates 124 are arranged at intervals along the second direction. At least one support plate 124 is provided with a limiting hole 1241, which corresponds to the first hole 1214. When the side frame 13 is rotated to the first position, the positions of the first hole 1214, the second hole 131, and the limiting hole 1241 correspond. The other end of the pin 144 passes through the limiting hole 1241, the first hole 1214, and the second hole 131 to fix the side frame 13 in the first position. The other end of the pin 144 is the end of the pin 144 away from the second connecting rod 143. This design allows the limiting hole 1241 to limit and guide the movement direction of the pin 144. The pin 144 can move in the direction of the line connecting the first hole 1214 and the limiting hole 1241 to smoothly insert into the second hole 131, making the operation of the locking assembly 14 more convenient.
[0037] In some embodiments, see Figure 6At least one support plate 124 is provided with a clearance hole 1242. When the side frame 13 is rotated to the first position, the other end of the pin 144 passes through the clearance hole 1242, the first hole 1214, and the second hole 131 to fix the side frame 13. There is a gap between the clearance hole 1242 and the pin 144 to allow the second connecting rod 143 to pass through. This design allows the second connecting rod 143 to also pass through the clearance hole 1242 after the pin 144 passes through it. The gap between the clearance hole 1242 and the pin 144 prevents the second connecting rod 143 from being stuck in the clearance hole 1242 due to its angled inclination relative to the pin 144.
[0038] In some embodiments, see Figures 3-6 The frame box 1 also includes a limiting plate 15, a blocking part 16, and a plug-in part 17. The limiting plate 15 is disposed between the top plate 122 and the bottom plate 123 of the connecting frame 12. The limiting plate 15 has a slot 151 and a first insertion hole. When the side frame 13 rotates to the first position, the pin 144 is inserted into the first hole 1214 and the second hole 131 to restrict the rotation of the side frame 13, and the pull rod 145 can be placed in the slot 151. The blocking part 16 is used to prevent the pull rod 145 from disengaging from the slot 151. One end of the blocking part 16 is rotatably connected to the limiting plate 15 around the slot 151, and the other end of the blocking part 16 is provided with a second insertion hole. The other end of the blocking part 16 can be rotated to a position corresponding to the first insertion hole and the second insertion hole to close the opening of the slot 151, thereby preventing the pull rod 145 from disengaging from the slot 151. The connector 17 is inserted into the first and second sockets to restrict the rotation of the blocking part 16, further restricting the rotation of the blocking part 16, so that the pull rod 145 is restricted in the slot 151, and the pull rod 145 will not be dislodged from the slot 151 due to accidental shaking during transportation, thus ensuring the reliability of the frame box 1.
[0039] In some embodiments, the point where the second connecting rod 143 is rotatably connected to the first connecting rod 142 is the first point, the point where the first connecting rod 142 is connected to the connecting frame 12 is the second point, and the point where the first connecting rod 142 is connected to the pull rod 145 is the third point. The distance between the first point and the second point is greater than the distance between the first point and the third point. This design allows the first connecting rod 142 to rotate more significantly when the user applies external force to the pull rod 145 to rotate the first connecting rod 142. This rotation of the first connecting rod 142 can then cause the second connecting rod 143 and the pin 144 to move more freely, thus avoiding the problem that the first connecting rod 142's rotation is too large and the pin 144 cannot be effectively inserted into or withdrawn from the first hole 1214.
[0040] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.
[0041] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
Claims
1. A frame box, characterized in that, include: A base frame that extends along a first direction; A connecting frame is disposed at at least one end of the base frame in a first direction, the connecting frame is connected to the base frame, and the connecting frame is provided with a first hole; A side frame is rotatably connected to the connecting frame, and the side frame is provided with a second hole; A locking component, connected to the connecting frame, the locking component comprising: Connecting seat, connected to the connecting frame; A first connecting rod, one end of which is rotatably connected to the connecting seat; A second connecting rod, one end of which is rotatably connected to the first connecting rod; A pin, one end of which is rotatably connected to the other end of the second connecting rod; The side frame has a first position. When the side frame is rotated to the first position, the first hole corresponds to the second hole, and the other end of the pin passes through the first hole and the second hole to fix the side frame.
2. The frame box according to claim 1, characterized in that, The locking component also includes: A pull rod, one end of which is connected to the other end of the first connecting rod; Under the action of external force, the pull rod pulls the first connecting rod to rotate, the first connecting rod drives the second connecting rod to move, and the second connecting rod drives the pin to move, so that the pin passes through the first hole and the second hole, or is pulled out of the first hole.
3. The frame box according to claim 1, characterized in that, When the side frame is rotated to the first position, the side frame is set at an angle to the base frame.
4. The frame box according to claim 1, characterized in that, The side frame has a second position, and when the side frame is rotated to the second position, the end of the side frame away from the connecting frame abuts against the base frame.
5. The frame box according to claim 1, characterized in that, The connecting frame includes: The connecting part has a third hole, and the side frame has a fourth hole. A connector passes through the third hole and the fourth hole to rotatably connect the side frame and the connecting part.
6. The frame box according to claim 5, characterized in that, The connecting part includes a first connecting plate and a second connecting plate spaced apart. The first connecting plate and the second connecting plate are each provided with the third hole. The portion of the side frame with the fourth hole is located between the first connecting plate and the second connecting plate.
7. The frame box according to claim 1, characterized in that, In the second direction, the locking components are respectively provided at opposite ends of the side frame, wherein the second direction is perpendicular to the first direction.
8. The frame box according to claim 2, characterized in that, The frame box also includes: A limiting plate is provided on the connecting frame. The limiting plate has a slot and a first insertion hole. When the pin is inserted into the first hole and the second hole, the pull rod can be placed in the slot. The blocking part has one end rotatably connected to the limiting plate around the card slot, and the other end of the blocking part is provided with a second insertion hole. The other end of the blocking part can be rotated to a position corresponding to the first insertion hole and the second insertion hole to close the opening of the card slot. A connector that is inserted into the first socket and the second socket to restrict the rotation of the blocking part.
9. The frame box according to claim 2, characterized in that, The point where the second connecting rod is rotatably connected to the first connecting rod is the first point, the point where the first connecting rod is connected to the connecting frame is the second point, and the point where the first connecting rod is connected to the pull rod is the third point. The distance between the first point and the second point is greater than the distance between the first point and the third point.
10. The frame box according to any one of claims 1-9, characterized in that, The connecting frame also includes: Top plate, located on top of the connecting frame; A base plate is disposed at the bottom of the connecting frame; At least one support plate, the two ends of which are respectively connected to the top plate and the bottom plate, and at least one support plate is provided with a limiting hole, the limiting hole corresponding to the first hole. When the side frame is rotated to the first position, the other end of the pin passes through the limiting hole, the first hole and the second hole to fix the side frame.