Folding storage box

Abstract

The utility model discloses a folding storage box which comprises a bottom frame, a top frame, a middle main plate and two side plates, so that a storage cavity is defined by the bottom frame, the top frame, the middle main plate and the two side plates. The middle main plate comprises a first fixed surface and two first folding surfaces, the first fixed surface is fixedly connected to the bottom frame, one end of each first folding surface is rotationally connected with the first fixed surface, the other end of each first folding surface is fixedly connected with the top frame, and each first folding surface comprises a plurality of folding units which are connected in sequence; the two side plates are arranged on the two sides of the middle main plate, each side plate comprises a second fixing face and a second folding face, the second fixing faces are fixedly connected to the top frame, and the second folding faces are rotationally connected with the second fixing faces; four L-shaped plates are arranged on the same side of the bottom frame and the top frame, the four L-shaped plates are arranged on the periphery of the first folding face or the side plates respectively, and the L-shaped plates protrude out of the projection face of the first folding face or the projection face of the side plates. According to the folding storage box, the stacking stability can be improved, the folding storage box can be folded for storage, and the use experience of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of storage box technology, and in particular to a folding storage box. Background Technology

[0002] Storage boxes are common storage tools. In actual use, users often need to configure multiple storage boxes at the same time to meet different storage requirements. However, the overall stability of multiple storage boxes stacked together is poor, which makes them prone to collapse. Moreover, when multiple storage boxes are stacked together, only the storage box on top can be easily accessed. In addition, the storage boxes themselves are large in size, occupying storage space when not in use, which affects the user experience. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a folding storage box that improves the stability of stacking and allows for folding and storage, thereby enhancing the user experience.

[0004] A folding storage box according to a first aspect of the present invention includes a base frame, a top frame, a middle main board, and two side panels to form a storage cavity. The middle main board includes a first fixed surface and two first folding surfaces. The first fixed surface is fixedly connected to the base frame, and the two first folding surfaces are symmetrically arranged on both sides of the first fixed surface. One end of the first folding surface is rotatably connected to the first fixed surface, and the other end of the first folding surface is fixedly connected to the top frame. The first folding surface includes a plurality of folding units connected in sequence, and two adjacent folding units are rotatably connected. The two side panels are arranged on both sides of the middle main board. Each side panel includes a second fixed surface and a second folding surface. The second fixed surface is fixedly connected to the top frame, and the second folding surface is rotatably connected to the second fixed surface. The second folding surface is detachably connected to the base frame. Four L-shaped plates are provided on the same side of the base frame and the top frame. The four L-shaped plates are respectively arranged around the first folding surface or the side panel, and the L-shaped plates protrude from the projection surface of the first folding surface or the side panel.

[0005] The folding storage box according to the embodiment of this utility model has at least the following beneficial effects: The main board includes a first fixed surface and two first folding surfaces. The first fixed surface is fixedly connected to the base frame, and the two first folding surfaces are symmetrically arranged on both sides of the first fixed surface. Two side panels are arranged on both sides of the main board. Each side panel includes a second fixed surface and a second folding surface. The second fixed surface is fixedly connected to the top frame, and the second folding surface is detachably connected to the base frame. This allows the base frame, top frame, main board, and two side panels to form a storage cavity for convenient storage of items. Four L-shaped panels are arranged on the same side of the base frame and top frame, and the four L-shaped panels are respectively arranged around the first folding surface or side panel. By setting the L-shaped panels to protrude from the projection surface of the first folding surface or side panel, multiple folding storage boxes can be easily stacked together, and the positions of two adjacent folding storage boxes can be positioned, improving the stability of the stacking. In addition, one end of the first folding surface is rotatably connected to the first fixed surface, and the other end is fixedly connected to the top frame. The second fixed surface is fixedly connected to the top frame, and the second folding surface is rotatably connected to the second fixed surface. By separating the second folding surface from the base frame and rotating the second folding surface around the second fixed surface, the two side panels can be folded. The first folding surface includes multiple folding units connected in sequence. Driving the multiple folding units to rotate relative to each other allows the two first folding surfaces to fold inward, thereby enabling the main board and the two side panels to fold together, allowing the top frame to move closer to the base frame for folding and storage, reducing space occupation.

[0006] According to some embodiments of the present invention, a first locking block is fixedly connected to the end of the second folding surface away from the second fixed surface, and the base frame has a first locking hole, the first locking block being able to be locked into the first locking hole.

[0007] According to some embodiments of the present invention, a pressure strip is fixedly connected to the first folded surface, and the pressure strip extends to both sides of the first folded surface.

[0008] According to some embodiments of the present invention, both ends of the pressure strip are connected with first hook and loop fasteners, and both sides of the side plate are connected with second hook and loop fasteners. The first hook and loop fasteners correspond one-to-one with the second hook and loop fasteners, and the first hook and loop fasteners can be connected to each other with the second hook and loop fasteners.

[0009] According to some embodiments of the present invention, the top frame is fixedly connected to two handles, which are symmetrically arranged on both sides of the top frame.

[0010] According to some embodiments of the present invention, the handle is provided with a second locking block, and the base frame is provided with a second locking hole, wherein the second locking block can be locked into the second locking hole.

[0011] According to some embodiments of the present invention, the base frame has two connecting slots, which are symmetrically arranged on both sides of the base frame, and the two first folding surfaces are respectively inserted into the two connecting slots.

[0012] According to some embodiments of the present invention, the base frame is provided with a third locking block, and the first fixing surface is provided with a third locking hole, and the third locking block can be locked into the third locking hole.

[0013] According to some embodiments of the present invention, both the base frame and the first fixing surface are provided with handle grooves, and the handle grooves are arranged adjacent to the side wall of the base frame.

[0014] According to some embodiments of the present invention, the lower end of the base frame is provided with a plurality of protrusions, which are arranged at intervals.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the unfolded folding storage box according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Enlarged view of a portion at point A;

[0019] Figure 3 This is a schematic diagram of the base frame of the folding storage box according to an embodiment of the present utility model;

[0020] Figure 4 This is an exploded view of the folding storage box according to an embodiment of the present utility model;

[0021] Figure 5 This is a folding diagram of the side panel of the folding storage box according to an embodiment of the present utility model;

[0022] Figure 6 This is a folding diagram of the main board of the folding storage box according to an embodiment of the present utility model.

[0023] Figure 7 This is a folding diagram of the folding storage box according to an embodiment of the present utility model;

[0024] Figure 8 for Figure 7 A magnified view of section B;

[0025] Figure 9This is a schematic diagram of the stacking of multiple folding storage boxes according to an embodiment of the present invention. Figure 1 ;

[0026] Figure 10 This is a schematic diagram of the stacking of multiple folding storage boxes according to an embodiment of the present invention. Figure 2 .

[0027] Figure label:

[0028] Base frame 100, first locking hole 110, second locking hole 120, connecting groove 130, third locking block 140, handle groove 150, protrusion 160;

[0029] Top frame 200, handle 210, second locking block 211;

[0030] The main board 300, the first fixing surface 310, the third card hole 311, the first folding surface 320, the folding unit 321, the pressure strip 330, and the first Velcro 331;

[0031] Side panel 400, second fixing surface 410, second folding surface 420, first locking block 421, second Velcro 430;

[0032] Storage cavity 500, L-shaped plate 600. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] Understandably, referring to Figure 1 , Figures 4 to 10 The folding storage box of this utility model includes a base frame 100, a top frame 200, a middle main plate 300, and two side plates 400 to form a storage cavity 500. The middle main plate 300 includes a first fixing surface 310 and two first folding surfaces 320. The first fixing surface 310 is fixedly connected to the base frame 100. The two first folding surfaces 320 are symmetrically arranged on both sides of the first fixing surface 310. One end of the first folding surface 320 is rotatably connected to the first fixing surface 310, and the other end of the first folding surface 320 is fixedly connected to the top frame 200. The first folding surface 320 includes a plurality of sequentially connected folding units 321. Two adjacent folding units... 321 is a rotatable connection; two side plates 400 are arranged on both sides of the main plate 300. The side plate 400 includes a second fixed surface 410 and a second folding surface 420. The second fixed surface 410 is fixedly connected to the top frame 200. The second folding surface 420 is rotatably connected to the second fixed surface 410, and the second folding surface 420 is detachably connected to the base frame 100. Four L-shaped plates 600 are provided on the same side of the base frame 100 and the top frame 200. The four L-shaped plates 600 are respectively arranged around the first folding surface 320 or the side plate 400, and the L-shaped plates 600 protrude from the projection surface of the first folding surface 320 or the side plate 400.

[0038] The main board 300 includes a first fixed surface 310 and two first folding surfaces 320. The first fixed surface 310 is fixedly connected to the base frame 100. The two first folding surfaces 320 are symmetrically arranged on both sides of the first fixed surface 310. Two side panels 400 are arranged on both sides of the main board 300. The side panels 400 include a second fixed surface 410 and a second folding surface 420. The second fixed surface 410 is fixedly connected to the top frame 200. The second folding surface 420 is detachably connected to the base frame 100. Thus, the base frame 100, the top frame 200, the main board 300 and the two side panels 400 form a storage cavity 500 to facilitate the storage of items.

[0039] Four L-shaped plates 600 are arranged on the same side of the base frame 100 and the top frame 200, and the four L-shaped plates 600 are respectively arranged around the first folding surface 320 or the side plate 400. By setting the L-shaped plates 600 to protrude from the projection surface of the first folding surface 320 or the side plate 400, multiple folding storage boxes can be easily stacked together, and the positions of two adjacent folding storage boxes can be positioned to improve the stability of stacking.

[0040] Reference Figure 1Four L-shaped panels 600 are arranged on the same side of the base frame 100 and the top frame 200. By setting the L-shaped panels 600 to protrude from the projection surface of the first folding surface 320 or the side panel 400, it is convenient to place multiple folding storage boxes and improve the user experience.

[0041] Reference Figure 9 The openings of the storage chambers 500 of the multiple folding storage boxes are all arranged facing upwards, and the multiple folding storage boxes are stacked together, which can facilitate the storage and organization of items. Not only can it be convenient to take out and put in items from the top folding storage box, but the storage chambers 500 of the lower folding storage boxes can also be closed to prevent dust from entering.

[0042] It should be noted that since the four L-shaped panels 600 are arranged on the same side of the base frame 100 and the top frame 200, adjacent folding storage boxes need to be rotated 180 degrees to place them, so that the L-shaped panels 600 on the adjacent folding storage boxes mutually limit the position, reduce the positional shaking of the folding storage boxes, and reduce the possibility of collapse.

[0043] Reference Figure 10 The storage compartments 500 of multiple folding storage boxes are all arranged sideways. By setting an L-shaped plate 600, the position of two adjacent folding storage boxes can be defined, so that the storage compartments 500 of each folding storage box can be opened, which makes it convenient for users to put in and take out items and improves the user experience.

[0044] One end of the first folding surface 320 is rotatably connected to the first fixed surface 310, and the other end is fixedly connected to the top frame 200. The second fixed surface 410 is fixedly connected to the top frame 200, and the second folding surface 420 is rotatably connected to the second fixed surface 410. By separating the second folding surface 420 from the base frame 100 and rotating the second folding surface 420 around the second fixed surface 410, the two side panels 400 can be folded. The first folding surface 320 includes a plurality of folding units 321 connected in sequence. Driving the plurality of folding units 321 to rotate relative to each other allows the two first folding surfaces 320 to fold inward, thereby enabling the main board 300 and the two side panels 400 to fold together, allowing the top frame 200 to move closer to the base frame 100 for folding and storage, reducing space occupation.

[0045] Reference Figure 1 , Figures 5 to 7When folding, the second folding surface 420 is folded upwards, and the two side panels 400 are folded in sequence, so that the two second folding surfaces 420 can move closer to the top frame 200. Then, multiple folding units 321 are folded inwards, so that the first folding surface 320 can move closer to the first fixed surface 310, thereby allowing the two first folding surfaces 320 to fold towards the base frame 100, so that the top frame 200 can fit snugly against the base frame 100. This facilitates the storage of the folding storage box, reduces space occupation, and improves the user experience.

[0046] Specifically, refer to Figure 6 Both the main board 300 and the side board 400 can be corrugated structures, and both the main board 300 and the side board 400 can be cut from the corrugated structure to form multiple folded edges. The corrugated structure includes two support surfaces and multiple support plates, which are arranged in parallel and spaced between the two support surfaces.

[0047] In order to form folding edges between the first fixed surface 310 and the first folding surface 320, between two adjacent folding units 321, and between the second fixed surface 410 and the second folding surface 420, the corrugated structure is cut, so that one of the supporting surfaces and multiple supporting plates are cut, and the two cut parts are connected by another supporting surface to form folding edges. This makes the structural composition of the main board 300 and the side board 400 the same, which not only facilitates processing and manufacturing and improves production efficiency, but also enhances the structural strength of the main board 300 and the side board 400 and improves the reliability of the folding storage box.

[0048] It should be noted that both the main board 300 and the side panel 400 can be made of plastic components such as polypropylene, and there are no restrictions on their materials.

[0049] Understandably, referring to Figure 1 , Figure 2 and Figure 5 A first locking block 421 is fixedly connected to the end of the second folding surface 420 away from the second fixed surface 410. The base frame 100 has a first locking hole 110, and the first locking block 421 can be locked into the first locking hole 110. The first locking block 421 is fixedly connected to the second folding surface 420, and the first locking hole 110 is provided in the base frame 100 so that when the side panel 400 is unfolded, the first locking block 421 can be locked into the first locking hole 110, thereby stabilizing the position of the second folding surface 420, preventing the second folding surface 420 from rotating on the second fixed surface 410, keeping the structure of the folding storage box stable, reducing the possibility of loosening, and improving reliability.

[0050] It should be noted that the number of first card blocks 421 and first card holes 110 is set to multiple, so that each first card hole 110 corresponds to at least one first card block 421, thereby improving the positional stability of the second folding surface 420, reducing the possibility of the second folding surface 420 shifting and shaking, and improving reliability.

[0051] Understandably, referring to Figure 1 A pressure strip 330 is fixedly connected to the first folding surface 320, extending to both sides of the first folding surface 320. The pressure strip 330 is fixedly connected to the first folding surface 320. By extending the pressure strip 330 to both ends of the first folding surface 320, the structural strength of the first folding surface 320 can be improved, the bending stress of the first folding surface 320 can be effectively dispersed, the possibility of deformation of the first folding surface 320 can be reduced, the pressure-bearing capacity of the folding storage box can be enhanced, and the reliability can be improved.

[0052] It should be noted that, referring to Figure 1 and Figure 10 When multiple folding storage boxes are stacked together, the lower folding storage box needs to support the weight of the upper folding storage box. By setting pressure strips 330, the structural strength of the folding storage box can be improved, the pressure can be effectively distributed, the possibility of deformation can be reduced, and the reliability can be improved.

[0053] Specifically, refer to Figure 1 and Figure 5 Both ends of the pressure strip 330 are connected to first Velcro 331, and both sides of the side panel 400 are connected to second Velcro 430. The first Velcro 331 and the second Velcro 430 are in one-to-one correspondence and can be connected to each other. When the folding storage box is in the unfolded state, by connecting the first Velcro 331 at both ends of the pressure strip 330 to the corresponding second Velcro 430 on both sides of the side panel 400, the connection stability between the first folding surface 320 and the side panel 400 can be strengthened, keeping the positions of the first folding surface 320 and the side panel 400 stable. This makes the structure of the entire storage cavity 500 more robust, reduces structural loosening caused by shaking during the placement or handling of items, and ensures the safety and stability of the stored items.

[0054] Understandably, referring to Figure 1 The top frame 200 is fixedly connected to two handles 210, which are symmetrically arranged on both sides of the top frame 200. The symmetrical arrangement of the two handles 210 on both sides of the top frame 200 provides users with convenient grip points. When carrying the folding storage box, users can easily hold the handles 210 with both hands, which improves the convenience and safety of carrying and reduces the risk of the folding storage box falling due to unstable grip during carrying.

[0055] Secondly, the symmetrically arranged two handles 210 can make the force on the folding storage box more even during transportation, avoiding tilting or shaking caused by uneven force on one side, reducing the possibility of the folding storage box becoming loose, and improving reliability.

[0056] Specifically, refer to Figure 7 and Figure 8 The handle 210 is equipped with a second locking block 211, and the base frame 100 has a second locking hole 120. The second locking block 211 can be engaged with the second locking hole 120. When the folding storage box is folded, the second locking block 211 can be engaged with the second locking hole 120, so that the handle 210 can fix the base frame 100 and the top frame 200 together, so that the position of the base frame 100 and the top frame 200 can be kept stable, preventing the folding storage box from becoming loose, facilitating storage and organization, and improving the user experience.

[0057] Understandably, referring to Figures 3 to 5 The base frame 100 has two connecting slots 130, which are symmetrically arranged on both sides of the base frame 100. Two first folding surfaces 320 are respectively inserted into the two connecting slots 130. The two connecting slots 130 are symmetrically arranged on both sides of the base frame 100. By setting the two first folding surfaces 320 to be respectively inserted into the two connecting slots 130, the first fixing surface 310 can be stably placed in the base frame 100. Moreover, the position of the first folding surfaces 320 can be limited to prevent the first folding surfaces 320 from shifting or shaking during use, thus ensuring a tight and reliable connection between the main board 300 and the base frame 100.

[0058] By setting the first folding surface 320 to pass through the connecting groove 130, the first fixing surface 310 can support the base frame 100, and the weight of the items can be transferred to the first fixing surface 310 through the base frame 100, thereby preventing the first fixing surface 310 from separating from the base frame 100 and improving the structural reliability of the folding storage box.

[0059] Understandably, referring to Figure 3 The base frame 100 is equipped with a third locking block 140, and the first fixing surface 310 has a third locking hole 311, into which the third locking block 140 can engage. By engaging the third locking block 140 with the third locking hole 311, the first fixing surface 310 and the base frame 100 are tightly connected, effectively preventing the main board 300 from shifting or loosening during use. This improves the overall stability of the folding storage box structure, better supports the weight of stored items, and reduces the risk of damage due to weak structural connections.

[0060] Secondly, during assembly, simply align the third locking block 140 of the base frame 100 with the third locking hole 311 of the first fixing surface 310 and engage it to quickly complete the connection between the motherboard 300 and the base frame 100. This simplifies the assembly process, improves assembly efficiency, and ensures the accuracy of the connection, thus avoiding structural problems caused by improper assembly.

[0061] Understandably, referring to Figure 3 Both the base frame 100 and the first fixed surface 310 are provided with handle grooves 150, which are arranged adjacent to the side wall of the base frame 100. When the user needs to move the folding storage box, he / she can directly put his / her hand into the handle groove 150. Since the handle groove 150 is adjacent to the side wall of the base frame 100, the user can apply force more easily without having to find a suitable point of leverage, making the moving process more effortless and efficient, and reducing the user's carrying burden.

[0062] It should be noted that, referring to Figure 3 and Figure 10 When the storage cavities 500 of multiple folding storage boxes are arranged sideways and stacked, by setting the handle groove 150 and the side wall of the base frame 100 to be adjacent, it is convenient for users to move the boxes without having to flip or adjust their positions, simplifying the moving process and improving the user experience.

[0063] Understandably, referring to Figure 3 and Figure 9 The lower end of the base frame 100 is provided with multiple protrusions 160, which are arranged at intervals. When the storage cavities 500 of multiple folding storage boxes are arranged with their openings facing upwards and stacked, the multiple protrusions 160 at the lower end of the base frame 100 can abut against the top frame 200 of the next folding storage box, which can reduce the possibility of two adjacent folding storage boxes slipping off each other, improve the stability of the storage boxes, ensure the safety of the stored items, and prevent items from falling and being damaged due to the sliding of the storage boxes.

[0064] When multiple folding storage boxes are stacked, the protrusion 160 can extend into the top frame 200 of the lower folding storage box, so that when two adjacent folding storage boxes slide against each other, the protrusion 160 can abut against the inner side wall of the top frame 200, thereby limiting the position of the folding storage boxes and reducing the possibility of the folding storage boxes slipping off.

[0065] It should be noted that the bump 160 can be made of rubber, silicone, etc., which can increase the coefficient of friction of the bump 160. These will not be elaborated on here.

[0066] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A folding storage box, characterized in that, It includes a base frame, top frame, middle main board and two side panels to form a storage cavity; The main board includes a first fixed surface and two first folding surfaces. The first fixed surface is fixedly connected to the base frame. The two first folding surfaces are symmetrically arranged on both sides of the first fixed surface. One end of the first folding surface is rotatably connected to the first fixed surface, and the other end of the first folding surface is fixedly connected to the top frame. The first folding surface includes a plurality of folding units connected in sequence, and two adjacent folding units are rotatably connected. The two side plates are arranged on both sides of the main plate. Each side plate includes a second fixed surface and a second folding surface. The second fixed surface is fixedly connected to the top frame, the second folding surface is rotatably connected to the second fixed surface, and the second folding surface is detachably connected to the base frame. Four L-shaped plates are provided on the same side of the base frame and the top frame. The four L-shaped plates are respectively arranged around the first folding surface or the side plate, and the L-shaped plates are arranged to protrude from the projection surface of the first folding surface or the side plate.

2. The folding storage box according to claim 1, characterized in that, The end of the second folding surface away from the second fixed surface is fixedly connected to a first locking block, and the base frame has a first locking hole, which the first locking block can be locked into.

3. The folding storage box according to claim 1, characterized in that, A pressure strip is fixedly connected to the first folded surface, and the pressure strip extends to both sides of the first folded surface.

4. The folding storage box according to claim 3, characterized in that, Both ends of the pressure strip are connected to a first hook and loop fastener, and both sides of the side panel are connected to a second hook and loop fastener. The first hook and loop fasteners correspond one-to-one, and the first hook and loop fasteners can be connected to each other.

5. The folding storage box according to claim 1, characterized in that, The top frame is fixedly connected to two handles, which are symmetrically arranged on both sides of the top frame.

6. The folding storage box according to claim 5, characterized in that, The handle is provided with a second locking block, and the base frame is provided with a second locking hole, the second locking block can be locked into the second locking hole.

7. The folding storage box according to claim 1, characterized in that, The base frame has two connecting slots, which are symmetrically arranged on both sides of the base frame, and the two first folding surfaces are respectively inserted into the two connecting slots.

8. The folding storage box according to claim 1 or 7, characterized in that, The base frame is provided with a third locking block, and the first fixing surface has a third locking hole, which can be locked into the third locking hole.

9. The folding storage box according to claim 1, characterized in that, Both the base frame and the first fixed surface are provided with handle grooves, and the handle grooves are arranged adjacent to the side wall of the base frame.

10. The folding storage box according to claim 1, characterized in that, The lower end of the base frame is provided with multiple protrusions, which are arranged at intervals.

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