New energy battery bearing tray and new energy battery packaging box
By setting up an annular baffle and crisscrossing reinforcement rods and convex rib structures on the pallet, the structural strength problem of the pallet when carrying new energy batteries is solved, and the stable transportation of the battery is achieved.
Patent Information
- Application Number
- CN202422421979.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing pallets are difficult to withstand the weight of new energy batteries and are prone to damage, causing the battery to fall and cannot meet the user's usage needs.
A new energy battery carrier tray is designed to form an accommodation space through the ring baffle and the base plate, and a crisscrossing reinforcement rod and reinforcement rib are provided on the inside of the baffle to enhance structural strength and increase the contact area with the battery.
It improves the structural strength of the pallet and the stability of the battery placement, ensuring that the battery is not easily damaged during transportation.
Smart Images

Figure CN223279574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of logistics and transportation equipment, and in particular to a new energy battery carrying tray and a new energy battery packaging box. Background Art
[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source (or use conventional automotive fuels and adopt new on-board power devices), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. There are many types of new energy vehicles, and pure electric vehicles are one of them. Pure electric vehicles need to be used with new energy batteries. Therefore, the demand for new energy batteries is also relatively large. Therefore, new energy batteries need to be packaged and transported.
[0003] After the production of new energy batteries is completed, they need to be transported to new energy vehicle production factories for assembly with new energy vehicles. Currently, pallets are usually used to place new energy batteries. Since new energy batteries have a certain weight, existing pallets are unable to bear the weight of new energy batteries, which can easily damage the pallets and even cause the batteries placed in the pallets to fall, failing to meet user needs. Utility Model Content
[0004] The main purpose of the utility model is to provide a new energy battery carrying tray, aiming to improve the structural strength of the new energy battery carrying tray.
[0005] To achieve the above objectives, the new energy battery carrying tray proposed in this utility model includes:
[0006] base plate;
[0007] an annular baffle, the annular baffle being arranged around the periphery of the bottom plate, and forming an accommodating space between the annular baffle and the bottom plate;
[0008] a plurality of reinforcing rods, the plurality of reinforcing rods being arranged on the inner side of the annular baffle, the plurality of reinforcing rods being connected to the surface of the bottom plate and the inner side of the annular baffle, and the plurality of reinforcing rods being arranged in a crisscross pattern; and
[0009] Multiple reinforcing ribs are protruded from the surface of the base plate, and the multiple reinforcing ribs are connected to the base plate and the annular baffle. Adjacent reinforcing ribs are spaced apart from each other, and the height of the reinforcing ribs relative to the base plate surface is greater than or equal to the height of the reinforcing rod.
[0010] Optionally, a plurality of mounting grooves are provided on the upper surface of the base plate, the plurality of mounting grooves are arranged in a crisscross pattern, and the plurality of reinforcing rods are disposed in the plurality of mounting grooves.
[0011] Optionally, the reinforcing rib, the bottom plate and the annular baffle are integrally formed.
[0012] Optionally, the reinforcing rod is made of one of iron, steel and aluminum.
[0013] Optionally, the annular baffle includes a plurality of reinforcement blocks and a plurality of ribs, the plurality of reinforcement blocks are distributed at intervals along the periphery of the bottom plate, and two adjacent reinforcement blocks are connected by the ribs.
[0014] Optionally, the new energy battery carrying tray also includes a partition structure, which is connected between the opposite sides of the annular baffle, and the partition structure divides the accommodating space into two placement slots. A plurality of reinforcing rods are connected to the inner side of the annular baffle, the bottom plate surface and the side of the partition structure.
[0015] The present utility model also proposes a new energy battery packaging box, comprising a base, an annular enclosure, a cover plate and the new energy battery carrying tray as described above, wherein a first mounting portion is provided on the upper surface of the base and close to the edge thereof, and the first mounting portion is in the shape of a ring extending circumferentially along the base, and the annular enclosure is open at both ends, and one end of the annular enclosure is detachably engaged with the first mounting portion, and a second mounting portion is provided on the lower surface of the cover plate, and the cover plate is detachably engaged with the end of the annular enclosure away from the base through the second mounting portion, and the new energy battery carrying tray is placed on the upper surface of the base.
[0016] Optionally, the new energy battery packaging box includes multiple new energy battery carrying trays, and the new energy battery carrying trays have a storage state and a use state. In the storage state, the multiple new energy battery carrying trays are mutually nested, and in the use state, the multiple new energy battery carrying trays are stacked up and down.
[0017] Optionally, the mounting groove is raised on the lower surface of the base plate to form a locking protrusion, and the top surface of the annular baffle is provided with a plurality of protrusions, and the plurality of protrusions are distributed at intervals along the circumference of the annular baffle. The top surface of the protrusion is concavely provided with a limiting groove, and the limiting groove passes through the opposite sides of the protrusion. In the usage state, the plurality of locking protrusions are inserted into the plurality of limiting grooves one by one.
[0018] Optionally, a first annular groove is formed on the first mounting portion, and one end of the annular enclosure is plugged into and fitted into the first annular groove.
[0019] The technical solution of the present invention is to arrange an annular baffle around the periphery of the base plate to cooperate with the base plate to form a storage space, arrange multiple reinforcing rods on the inner side of the annular baffle, and each reinforcing rod is connected to the surface of the base plate and the inner side of the annular baffle. The multiple reinforcing rods are arranged in a crisscross pattern, and multiple reinforcing ribs are protruded from the surface of the base plate. The multiple reinforcing ribs are connected to the base plate and the annular baffle, and adjacent reinforcing ribs are spaced apart from each other. In other words, the structural strength of the base plate and the annular baffle is simultaneously strengthened by the multiple reinforcing rods and the multiple reinforcing ribs. The height of the reinforcing ribs relative to the base plate surface is greater than or equal to the height of the reinforcing rods. In this way, when the new energy battery is placed in the storage space, the multiple reinforcing ribs can support the new energy battery. This arrangement can not only improve the structural strength of the new energy battery carrier tray, but also provide a larger contact area between the new energy battery and the new energy battery carrier tray, which is conducive to improving the placement stability of the new energy battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0021] Figure 1 This is a structural diagram of an embodiment of a new energy battery carrying tray of the present utility model;
[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the hidden reinforcement rod of the new energy battery carrier tray;
[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0024] Figure 4 for Figure 1 Schematic diagram of the structure in which multiple new energy battery carrying trays are stacked;
[0025] Figure 5 for Figure 1 Side view of the new energy battery carrier tray;
[0026] Figure 6 for Figure 5 Enlarged view of point B in the middle;
[0027] Figure 7 This is a structural diagram of an embodiment of a new energy battery packaging box of the present utility model.
[0028] Description of Figure Numbers:
[0029] 10. Bottom plate; 11. Accommodation space; 111. Placement groove; 12. Mounting groove; 13. Snap-on protrusion; 14. Slot; 20. Annular baffle; 21. Rib plate; 22. Reinforcement block; 23. Protrusion; 231. Positioning groove; 30. Reinforcement rod; 40. Reinforcement rib; 50. Partition structure; 60. Bottom support; 61. Annular enclosure; 62. Cover plate
[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0034] The utility model provides a new energy battery carrying tray.
[0035] In the embodiment of the present utility model, Figures 1 to 6 As shown, the new energy battery carrying tray includes a bottom plate 10 , an annular baffle 20 , a plurality of reinforcing rods 30 and a plurality of reinforcing ribs 40 .
[0036] An annular baffle 20 is arranged on the periphery of the base plate 10, and an accommodating space 11 is formed between the annular baffle 20 and the base plate 10; a plurality of reinforcing rods 30 are arranged on the inner side of the annular baffle 20, and the plurality of reinforcing rods 30 are connected to the surface of the base plate 10 and the inner side of the annular baffle 20, and the plurality of reinforcing rods 30 are arranged crisscrossed; a plurality of reinforcing ribs 40 are protruded from the surface of the base plate 10, and the plurality of reinforcing ribs 40 are connected to the base plate 10 and the annular baffle 20, and adjacent two reinforcing ribs 40 are spaced from each other, and the height of the reinforcing ribs 40 relative to the surface of the base plate 10 is greater than or equal to the height of the reinforcing rods 30.
[0037] Specifically, the annular baffle 20 is disposed around the periphery of the base plate 10. A storage space 11 is formed between the inner side of the annular baffle 20 and the upper surface of the base plate 10. This storage space 11 is used to house the new energy battery. There are at least two reinforcing rods 30 and two reinforcing ribs 40. The multiple reinforcing rods 30 are arranged in a crisscross pattern, each connecting to the upper surface of the base plate 10 and the inner side of the annular baffle 20. The multiple reinforcing ribs 40 are connected to the upper surface of the base plate 10 and the inner side of the annular baffle 20, with adjacent reinforcing ribs 40 spaced apart. This multiple reinforcing rods 30 and multiple reinforcing ribs 40 simultaneously strengthen the structural strength of the base plate 10 and the annular baffle 20. For example, the number of reinforcing rods 30 can be, but is not limited to, two, three, four, five, or more. Similarly, the number of reinforcing ribs 40 can be, but is not limited to, two, three, four, five, or more. Optionally, the reinforcing rods 30 are made of tungsten, steel, or titanium. It can be understood that tungsten, steel and titanium all have strong structural strength, that is, the reinforcing rod 30 made of one of tungsten, steel and titanium also has its characteristics, which is beneficial to improving the structural strength of the new energy battery carrying tray.
[0038] The height of the reinforcing rib 40 relative to the surface of the base plate 10 is greater than or equal to the height of the reinforcing rod 30. When the new energy battery is placed in the accommodating space 11, the new energy battery can be supported by a plurality of reinforcing ribs 40. While improving the structural strength of the new energy battery carrying tray, the new energy battery carrying tray and the new energy battery have a larger contact area, which is beneficial to improving the placement stability of the new energy battery. Among them, the height of the reinforcing rib 40 can be set selectively. In some embodiments, the height of the reinforcing rib 40 can be greater than the height of the reinforcing rod 30. In another embodiment, the height of the reinforcing rib 40 is equal to the height of the reinforcing rod 30. The specific setting can be made according to actual conditions, and this application does not impose any specific restrictions.
[0039] It is worth noting that when the height of the reinforcing ribs 40 and the reinforcing rods 30 is equal to the height of the reinforcing rods 30 , multiple reinforcing rods 30 and multiple reinforcing ribs 40 can simultaneously support the new energy battery.
[0040] The technical solution of the present invention is to surround an annular baffle 20 around the periphery of the base plate 10 to form an accommodating space 11 with the base plate 10. A plurality of reinforcing rods 30 are disposed on the inner side of the annular baffle 20, each of which is connected to the surface of the base plate 10 and the inner side of the annular baffle 20. The reinforcing rods 30 are arranged in a crisscross pattern. A plurality of reinforcing ribs 40 are protruded from the surface of the base plate 10, each of which is connected to the base plate 10 and the annular baffle 20, with adjacent reinforcing ribs 40 spaced apart from each other. In other words, the structural strength of both the base plate 10 and the annular baffle 20 is simultaneously strengthened by the plurality of reinforcing rods 30 and the plurality of reinforcing ribs 40. The height of the reinforcing rib 40 relative to the surface of the base plate 10 is greater than or equal to the height of the reinforcing rod 30. In this way, when the new energy battery is placed in the accommodating space 11, the new energy battery can be supported by multiple reinforcing ribs 40. Such a setting can improve the structural strength of the new energy battery carrying tray while allowing the new energy battery and the new energy battery carrying tray to have a larger contact area, which is beneficial to improving the placement stability of the new energy battery.
[0041] In some embodiments, the upper surface of the base plate 10 is provided with a plurality of mounting slots 12, which are arranged in a crisscross pattern. A plurality of reinforcing rods 30 are disposed within each of the mounting slots 12. Specifically, the crisscross pattern of the mounting slots 12 is generally arranged in a "well" shape, with a reinforcing rod 30 installed in each mounting slot 12. This reduces the difficulty of installing the reinforcing rods 30 while also increasing the contact area between the reinforcing rods 30 and the base plate 10, thereby enhancing the structural strength of the base plate 10. Of course, in other embodiments, the reinforcing rods 30 are mounted directly on the surface of the base plate 10.
[0042] In some embodiments, the reinforcing rib 40, base plate 10, and annular baffle 20 are integrally formed. It will be appreciated that this integrated molding process offers high production efficiency, enhanced structural strength, and helps reduce production costs. Of course, the present invention is not limited to this embodiment. In other embodiments, the reinforcing rib 40, base plate 10, and annular baffle 20 may be connected to each other via bonding, clamping, fasteners, or other methods.
[0043] In some embodiments, the annular baffle 20 includes a plurality of reinforcement blocks 22 and a plurality of ribs 21. The reinforcement blocks 22 are spaced apart along the periphery of the base plate 10, and adjacent reinforcement blocks 22 are connected by ribs 21. Specifically, the plurality of reinforcement blocks 22 and the plurality of ribs 21 are staggered, which effectively improves the structural strength of the annular baffle 20 while also helping to reduce production costs.
[0044] In some embodiments, the new energy battery carrier tray further includes a partition structure 50 connected between opposite sides of the annular baffle 20. The partition structure divides the accommodating space 11 into two placement slots 111. Multiple reinforcing rods 30 are connected to the inner side of the annular baffle 20, the surface of the base plate 10, and the side of the partition structure 50. Both placement slots 111 are used to place new energy batteries. This allows multiple new energy batteries to be placed on the base plate 10, which helps to improve the load-bearing capacity of the new energy battery carrier tray. Of course, in other embodiments, the new energy battery carrier tray does not have a partition structure 50.
[0045] The utility model also proposes a new energy battery packaging box, such as Figure 7 As shown, the new energy battery packaging box includes a base 60, an annular enclosure 61, a cover plate 62 and a new energy battery carrying tray. The specific structure of the new energy battery carrying tray refers to the above embodiment. Since this new energy battery packaging box adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the upper surface of the base 60 and the part close to the edge are provided with a first mounting portion, and the first mounting portion is annular and extends circumferentially along the base 60. The annular enclosure 61 is open at both ends, and one end of the annular enclosure 61 is detachably matched with the first mounting portion. The lower surface of the cover plate 62 is provided with a second mounting portion, and the cover plate 62 is detachably matched with the end of the annular enclosure 61 away from the base 60 through the second mounting portion. The new energy battery carrying tray is placed on the upper surface of the base 60.
[0046] Specifically, when the annular panel 61 is installed on the first mounting portion, the annular panel 61 cooperates with the base 60 to form a placement cavity. At this time, the user can place the new energy battery carrier tray from the opening at the other end of the annular panel 61 into the placement cavity, and then place the new energy battery in the accommodating space 11 from the opening. When the new energy batteries placed in the accommodating cavity reach the preset value, another cover 62 is used to cover the opening of the annular panel 61, thereby completing the packaging. Among them, the preset value can be set according to the size of the new energy battery, or it can be set by the capacity of the accommodating space 11, and this application does not make specific restrictions on this.
[0047] In some embodiments, a new energy battery packaging box includes multiple new energy battery carrier trays, which have a storage state and a use state. In the storage state, the multiple new energy battery carrier trays are mutually nested, and in the use state, the multiple new energy battery carrier trays are stacked up and down. Specifically, the annular baffle 20 and the reinforcing ribs 40 form a groove on the lower surface of the bottom plate 10. When the new energy battery carrier trays are used up or no longer needed, multiple of them can be nested together. In this storage state, the new energy battery carrier trays on the lower layer are inserted into the grooves of the upper layer new energy battery carrier trays through the annular baffle 20 and the reinforcing ribs 40 for storage, thereby reducing the occupied space.
[0048] When new energy batteries need to be transported, they can be loaded onto a new energy battery carrier tray, and then a new energy battery carrier tray can be stacked on top and new energy batteries can be placed on top, and so on. It should be noted that when a user needs to stack multiple new energy battery carrier trays, one of the two adjacent new energy battery carrier trays needs to be rotated 180 degrees so that the upper card slot 14 is staggered with the lower annular baffle 20 and reinforcing ribs 40, thereby achieving a stacked arrangement of multiple new energy battery carrier trays.
[0049] Furthermore, the mounting groove 12 is raised on the lower surface of the base plate 10 to form a latching protrusion 13, and a plurality of protrusions 23 are provided on the top surface of the annular baffle 20. The plurality of protrusions 23 are distributed at intervals along the circumference of the annular baffle 20, and a limiting groove 231 is concavely provided on the top surface of the protrusion 23. The limiting groove 231 passes through the opposite sides of the protrusion 23. In use, the plurality of latching protrusions 13 are inserted into the plurality of limiting grooves 231 one by one.
[0050] Specifically, when multiple new energy battery trays are stacked, the latching protrusions 13 on the upper layer of the new energy battery tray are inserted into the limiting grooves 231 of the lower layer of the new energy battery tray. The latching protrusions 13 and the limiting grooves 231 cooperate with each other to limit the new energy battery trays in use, thereby preventing the new energy battery trays from shifting, which is conducive to improving the stability of the stacked arrangement of multiple new energy battery trays. Of course, in other embodiments, the new energy battery trays may not be provided with the limiting grooves 231.
[0051] In some embodiments, the first mounting portion is formed with a first annular groove, and one end of the annular panel 61 is plugged into the first annular groove. Specifically, when the annular panel 61 needs to be installed on the base 60, the annular panel 61 can be directly inserted into the first annular groove. When the annular panel 61 needs to be removed from the base 60, it is only necessary to disengage the annular panel 61 from the plug-in fit with the first annular groove, and the annular panel 61 can be removed from the base 60, so as to facilitate separate storage. The entire installation and removal operation is relatively simple, thereby improving the user experience. Of course, in other embodiments, the first mounting portion is formed with a first annular protrusion, and one end of the annular panel 61 is provided with a plug-in groove, and the annular panel 61 is plugged into the first annular protrusion.
[0052] In some embodiments, the annular enclosure 61 includes at least four baffles, and any two adjacent baffles are connected by a flexible portion so that the annular enclosure 61 has a folded state in which at least two baffles are stacked together. Specifically, the four baffles can move relative to each other and can move toward adjacent baffles to get closer or farther away. When the annular enclosure 61 is idle, it can be folded to fold the frame-shaped annular enclosure 61 into a state in which at least two baffles are stacked together. This can reduce the space occupied by the annular enclosure 61, making it easier to store. When the annular enclosure 61 is needed, it only needs to be restored to its frame shape. Here, at least four baffles means that at least four baffles are set, and it does not mean that only four baffles can be set. In other embodiments, an even number of baffles such as six, eight, or ten can also be set.
[0053] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A new energy battery carrying tray, characterized in that: include: base plate; an annular baffle, the annular baffle being arranged around the periphery of the bottom plate, and forming an accommodating space between the annular baffle and the bottom plate; A plurality of reinforcing rods, wherein the plurality of reinforcing rods are arranged on the inner side of the annular baffle, the plurality of reinforcing rods are connected to the surface of the bottom plate and the inner side of the annular baffle, and the plurality of reinforcing rods are arranged in a crisscross manner; as well as Multiple reinforcing ribs are protruded from the surface of the base plate, and the multiple reinforcing ribs are connected to the base plate and the annular baffle. Adjacent reinforcing ribs are spaced apart from each other, and the height of the reinforcing ribs relative to the base plate surface is greater than or equal to the height of the reinforcing rod.
2. The new energy battery carrying tray according to claim 1, characterized in that: The upper surface of the bottom plate is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged in a crisscross pattern, and the plurality of reinforcing rods are separately arranged in the plurality of mounting grooves.
3. The new energy battery carrying tray according to claim 1, characterized in that: The reinforcing ribs, the bottom plate and the annular baffle are integrally formed.
4. The new energy battery carrying tray according to claim 1, characterized in that: The reinforcing rod is made of one of iron, steel and aluminum.
5. The new energy battery carrying tray according to claim 1, characterized in that: The annular baffle includes a plurality of reinforcement blocks and a plurality of ribs. The plurality of reinforcement blocks are distributed at intervals along the periphery of the bottom plate, and two adjacent reinforcement blocks are connected by the ribs.
6. The new energy battery carrying tray according to claim 1, characterized in that: The new energy battery carrying tray also includes a partition structure, which is connected between the opposite sides of the annular baffle. The partition structure divides the accommodating space into two placement slots, and multiple reinforcing rods are connected to the inner side of the annular baffle, the bottom plate surface and the side of the partition structure.
7. A new energy battery packaging box, characterized in that: A new energy battery carrying tray comprising a base, an annular enclosure, a cover plate and any one of claims 1 to 6, wherein a first mounting portion is provided on the upper surface of the base and near the edge, the first mounting portion is in the shape of a ring extending circumferentially along the base, the annular enclosure is open at both ends, one end of the annular enclosure is detachably engaged with the first mounting portion, a second mounting portion is provided on the lower surface of the cover plate, the cover plate is detachably engaged with the end of the annular enclosure away from the base through the second mounting portion, and the new energy battery carrying tray is placed on the upper surface of the base.
8. The new energy battery packaging box according to claim 7, characterized in that: The new energy battery packaging box includes multiple new energy battery carrying trays, which have a storage state and a use state. In the storage state, the multiple new energy battery carrying trays are nested with each other, and in the use state, the multiple new energy battery carrying trays are stacked up and down.
9. The new energy battery packaging box according to claim 8, characterized in that: The mounting groove is raised on the lower surface of the base plate to form a locking protrusion, and the top surface of the annular baffle is provided with a plurality of protrusions, and the plurality of protrusions are distributed at intervals along the circumference of the annular baffle. The top surface of the protrusion is concavely provided with a limiting groove, and the limiting groove passes through the opposite sides of the protrusion. In the use state, the plurality of locking protrusions are inserted into the plurality of limiting grooves in a one-to-one correspondence.
10. The new energy battery packaging box according to claim 7, characterized in that: The first mounting portion is formed with a first annular groove, and one end of the annular enclosure is plugged into and fitted with the first annular groove.