Extendable water meter box

Abstract

The present invention provides an extendable water meter box, which belongs to the technical field of water meter boxes. It solves the problem that the door of the existing water meter box is inconvenient to open and close. The extendable water meter box includes a main box body spliced ​​by a plurality of sub-boxes, all of which are spliced ​​and fixed in sequence from left to right, each sub-box body is provided with a box door on the front side, and two adjacent box doors are hingedly connected, the right side of the box door located on the far right is hingedly connected to the right side of the main box body, and the left side of the box door located on the far left is locked and fixedly connected to the left side of the main box body through a lock, and the left side of each box door can be buckled and fixed with the main box body, and applying a certain external force to pull the box door on the left side can open the adjacent box door on the right side. The extendable water meter box has the advantage of convenient box door opening and closing.

Description

Technical Field

[0001] The invention belongs to the technical field of water meter boxes and relates to an extendable water meter box. Background Art

[0002] With the implementation of tiered water prices, centralized management of water meters is also being gradually promoted. Existing newly built communities have basically achieved centralized installation and management of water meters. In order to avoid theft of water meters, damage to pipelines, or unauthorized modification to steal water, some new communities place the water meters on each floor in independent water meter boxes, that is, each household corresponds to a water meter box. Although this has curbed the occurrence of the above-mentioned situation to a certain extent, it is not convenient for unified installation and management of water meters, and it wastes installation space.

[0003] In response to the above problems, people have made various improvements, and some have even applied for patents. For example, Chinese patent literature discloses a spliced ​​water meter box [patent number: 201610943770.9; application publication number: CN108020287A], which includes a water meter box body spliced ​​together by a number of sub-boxes, a water meter box door body is provided at the front of the water meter box body, and a branch pipe hole is formed after adjacent sub-boxes are spliced ​​together. The water meter box can be spliced ​​and installed after the water meter is installed or before the installation. The water meter box can be installed by splicing and fixing from top to bottom or from bottom to top in sequence, and the rear wall of each sub-box is fixed to the wall of the building by a hexagonal nut.

[0004] For the centrally managed water meters, all the water meters need to be uniformly inspected and managed each time they are managed. The water meter box of this structure has multiple independent doors on the door body. In order to better prevent theft, a lock needs to be set on the elastic switch of this structure, and each door has a lock. That is, each time management is performed, one lock is opened, one door is opened, inspection and management are performed, and then the door is closed and locked again, and then the next lock is opened, and the above steps are repeated for inspection operations. The operation is cumbersome, and different locks have different keys. When opening, it is also very inconvenient to compare with the correct key. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to propose an extendable water meter box, which solves the technical problem of how to make the water meter box door easy to open and close.

[0006] The objectives of the present invention can be achieved through the following technical solutions: an extendable water meter box, comprising a main box body formed by splicing a plurality of sub-box bodies, characterized in that all the sub-box bodies are spliced ​​and fixed in sequence from left to right, each of the sub-box bodies is provided with a box door on the front side, two adjacent box doors are hingedly connected, the right side of the box door located on the far right is hingedly connected to the right side of the main box body, and the left side of the box door located on the far left is locked and fixedly connected to the left side of the main box body through a lock, the left side of each of the box doors can be buckled and fixed to the main box body, and applying a certain external force to pull the box door on the left side can open the adjacent box door on the right side.

[0007] The sub-boxes are arranged in the horizontal direction, and a water meter is arranged in each sub-box. The two adjacent box doors are hinged and connected, that is, all the box doors are connected together. The box door on the far right is hinged to the right side of the main box, and the box door on the far left is locked and fixedly connected to the left side of the main box through a lock, that is, all the box doors can be locked with the main box. During inspection and management, only one lock needs to be opened. At the same time, applying a certain external force to pull the box door on the left side can open the adjacent box door on the right side to separate the box door from the main box. The water meter box door is easy to open. When closing, a certain external force is applied to make the left side of the box door buckle and fix with the main box. Finally, the lock is locked, and the box door is also easy to close. The left side of each box door can be buckled and fixed with the main box. This structure makes the box door and the corresponding sub-box fixed, making the box door more stable after installation, and the box door can better fit with the main box and is not easy to be damaged.

[0008] In the above-mentioned extendable water meter box, the left side of the front side of each sub-box body has a first buckling groove that is concavely arranged, and the bottom of the first buckling groove has a buckling rib that is convexly arranged and has an arc-shaped cross-section on the top surface. The left side of each box door has a buckling block that is convexly arranged inwardly, and the inner side wall of the buckling block has a positioning groove that is concavely arranged and has an arc-shaped cross-section. The buckling block is embedded in the first buckling groove and the buckling rib is embedded in the positioning groove so that the box door is buckled and fixed with the main box body. The depth of the positioning groove is relatively shallow. By applying a certain external force, the buckling block is embedded in the first buckling groove, and the buckling rib and the buckling block are hard squeezed and embedded in the positioning groove, so that the box door is fixed with the corresponding sub-box body; the cross-section of the top surface of the buckling rib is arc-shaped and the cross-section of the positioning groove is arc-shaped, so that the buckling block and the sub-box body can be buckled and fixed and can be detached, and there will be no problem of jamming. In actual production, the positioning groove can be in the form of a pit, and the buckling rib can be in the form of a convex point.

[0009] In the above-mentioned extendable water meter box, each sub-box has a second buckling groove on the right side of the front side, and the second buckling groove is arranged opposite to the first buckling groove. When two adjacent sub-boxes are spliced ​​and fixed, the buckling block can be embedded in the space formed by the first buckling groove and the second buckling groove. This structure makes reasonable use of space, so that the buckling block can be made larger accordingly, so that the buckling block has sufficient strength and is not easily damaged when opening and closing.

[0010] In the above-mentioned extendable water meter box, a left end cover is fixedly connected to the left side of the main box body, and the lock includes an axially positioned circumferentially rotatable rotating member arranged between the left end cover and the main box body. An arc-shaped recessed locking groove is provided on the outer side wall of the snap-fit ​​block located on the far left, and both ends of the locking groove pass through the side of the snap-fit ​​block. The rotating member includes a rotating portion for positioning with a wrench and an arc-shaped locking portion. When the locking portion is rotated and embedded in the locking groove, the snap-fit ​​block located on the far left is locked so that the box door is locked on the front side of the main box body. By inserting the wrench into the rotating part, the wrench and the rotating part are stuck to each other, the wrench is turned to drive the rotating part to rotate, so that the locking part rotates and is inserted into the locking groove, the buckle block on the far left is locked, and the box door on the far left is locked to the front side of the main box body. Since all the box doors are hinged, all the box doors are locked, and the leftmost box door can be opened by rotating in the opposite direction, so that all the box doors are opened. In actual production, the box door on the far left can also be locked by a padlock.

[0011] In the above-mentioned extendable water meter box, the front end of the locking part gradually becomes thicker in the clockwise and horizontal direction. The front end of the locking part plays a guiding role, so that the locking part starts to enter the locking groove smoothly. This structure makes the rotating part and the buckle block tighter and tighter, and the locking stability is good.

[0012] In the above-mentioned extendable water meter box, the end of the rear end of the locking part has a protruding limit block, and the limit block can abut against the buckle block located on the far left. The limit block plays a role of limiting, and when the limit block abuts against the buckle block located on the far left, it means that the locking part is rotated into place.

[0013] In the above-mentioned extendable water meter box, a handle is hinged on the left side of the box door located on the far left, and the handle is embedded between the left end cover and the sub-box body located on the far left. The front side of the handle is flush with the front side of the box door, and the side of the rotating member has a protruding push block. Rotating the rotating member can make the push block contact and push the handle to rotate around the hinge point. Under normal conditions, the handle is embedded between the left end cover and the sub-box body located on the far left, and the handle cannot be taken out. Rotating the rotating member can pop out the handle through the push block. After the handle pops out, the locking part leaves the locking groove. The user applies a certain external force to pull the handle to separate the snap-fit ​​block from the sub-box body, thereby opening the box door; when closing the box door, the rotating member rotates into place, so that the locking part is embedded in the locking groove, and then the handle is pushed to be embedded between the left end cover and the sub-box body located on the far left.

[0014] In the above-mentioned extendable water meter box, a right end cover is fixedly connected to the right side of the main box body, and the box door located at the far right is hinged to the right end cover. The arrangement of the right end cover can make all sub-boxes have the same structure, reduce the manufacture of molds during production, reduce production costs, and at the same time, the sub-boxes do not need to be selected during assembly, thereby improving assembly efficiency.

[0015] In the above-mentioned extendable water meter box, the top of the front side of the sub-box body has an upper convex strip protruding forward, the bottom of the front side of the sub-box body has a lower convex strip protruding forward, the box door is embedded between the corresponding upper and lower convex strips, and the front side surfaces of the upper and lower convex strips are flush with the front side surfaces of the corresponding box door. This structure enables the box door to be embedded, and the box door cannot be violently opened by hard pulling the upper and lower ends of the box door, thereby improving the anti-theft effect.

[0016] In the above-mentioned extendable water meter box, the right side wall of the sub-box has several protruding first splicing pieces and several recessed first splicing grooves, and the left side wall of the sub-box has several protruding second splicing pieces and several recessed second splicing grooves. When two adjacent sub-boxes are spliced ​​and fixed, the first splicing piece is embedded in the corresponding second splicing groove, and the second splicing piece is embedded in the corresponding first splicing groove. The sub-boxes are spliced ​​by plugging, and then the pins are removed to fix them, which is convenient for assembly; this water meter box is hung on the wall, and this structure generates mutual torque between the two adjacent boxes, so that the sub-boxes can better form the main box, with stronger integrity, and the sub-boxes are not easy to fall apart after assembly.

[0017] In the above-mentioned extendable water meter box, the left side of the box door has a plurality of recessed embedding grooves, and the right side of the box body has a plurality of protruding embedding blocks, which can be embedded in the embedding grooves of the adjacent right box door, and the two adjacent box doors are hingedly connected by means of a pin shaft.

[0018] In the above-mentioned extendable water meter box, the top of the box body has a through window hole, a window glass is fixedly connected to the window hole, and a window cover is hinged on the top of the box body, and the window cover can be turned to block the window hole. When reading the water meter, the water meter reading can be directly viewed through the window hole without opening or closing the box door; the window glass and the window cover both play a protective role.

[0019] In the above-mentioned extendable water meter box, the top of the box body has a through-going water outlet hole, the bottom of the box body has a through-going water inlet hole, and the bottom of the box body also has a plurality of through-going drainage holes. The water pipe is inserted into the sub-box body along the output direction, and the setting of the drainage hole prevents water from accumulating in the sub-box body.

[0020] Compared with the prior art, the extendable water meter box provided by the present invention has the following advantages:

[0021] 1. A water meter is arranged in each sub-box of the water meter box. Two adjacent box doors are hingedly connected, that is, all the box doors are connected together. The box door on the far right is hingedly connected to the right side of the main box, and the box door on the far left is locked and fixedly connected to the left side of the main box through a lock, so that all the box doors can be locked with the main box. When inspecting and managing, only one lock needs to be opened. The door of the water meter box is easy to open and close.

[0022] 2. Each door of the water meter box is provided with a snap-fit ​​block, through which the door is fixed to the corresponding sub-box, making the door more stable after installation, and the door can fit better with the main box and is not easily damaged.

[0023] 3. The handle of the water meter box is embedded between the left end cover and the leftmost sub-box body, and the box door is embedded between the corresponding upper convex strips and lower convex strips, so that the exterior of the water meter box is flat and the anti-theft capability is improved.

[0024] 4. The structure of the sub-box of the water meter box is the same, and the structure of the box door is also the same. According to actual needs, a main box composed of several sub-boxes can be selected for splicing. When splicing, there is no problem in selecting parts, which improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the extendable water meter box.

[0026] Figure 2 It is a schematic diagram of the splicing structure of two sub-boxes of the extendable water meter box.

[0027] Figure 3 It is a locking schematic diagram of the extendable water meter box lock.

[0028] Figure 4 It is a state diagram of the extendable water meter box lock when locked.

[0029] Figure 5 It is a schematic diagram of the overall structure of the extendable water meter box door.

[0030] Figure 6 This is the state of the extendable water meter box when the box is opened Figure 1 .

[0031] Figure 7 This is the state of the extendable water meter box when the box is opened Figure 2 .

[0032] In the figure, 1, sub-box; 11, first snap-fit ​​groove; 12, snap-fit ​​rib; 13, second snap-fit ​​groove; 14, upper convex strip; 15, lower convex strip; 16, first splicing piece; 17, first splicing groove; 18, second splicing piece; 19, second splicing groove; 110, window hole; 111, window glass; 112, window cover; 113, water outlet hole; 114, water inlet hole; 115, drain hole; 2, main box; 3, box door; 31, snap-fit ​​block; 32, positioning groove; 33, locking groove; 34, embedding groove; 35, embedding block; 4, lock; 41, rotating member; 42, rotating part; 43, locking part; 44, limit block; 45, push block; 5, left end cover; 6, handle; 7, right end cover. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] like Figure 1 , Figure 6 , Figure 7 As shown, the extendable water meter box includes a sub-box 1, a box door 3, a lock 4, a left end cover 5, a handle 6, and a right end cover 7. In this embodiment, three sub-boxes 1 are spliced ​​to form the main box 2, and all the sub-boxes 1 are spliced ​​and fixed in sequence from left to right along the horizontal direction. In actual production, the main box 2 can be formed by splicing two or eight sub-boxes 1, or the main box 2 can be formed by a single sub-box 1.

[0035] like Figure 2As shown, the right side wall of the sub-box 1 has a protruding first splicing piece 16 and a recessed first splicing groove 17, and the left side wall of the sub-box 1 has a protruding second splicing piece 18 and a recessed second splicing groove 19. When two adjacent sub-boxes 1 are spliced ​​and fixed, the first splicing piece 16 is embedded in the corresponding second splicing groove 19, and the second splicing piece 18 is embedded in the corresponding first splicing groove 17. Then, a pin is inserted at a set position to connect the two adjacent sub-boxes 1. The left side of the main box 2 is fixedly connected with a left end cover 5, that is, the left side of the sub-box 1 located on the far left is fixedly connected with the left end cover 5, and the right side of the main box 2 is fixedly connected with a right end cover 7, that is, the right side of the sub-box 1 located on the far right is fixedly connected with the left end cover 5. The right side of the rightmost door 3 is hinged to the right side of the main box 2, specifically, it is hinged to the right end cover 7 on the right side of the main box 2.

[0036] The top of the front side of the sub-box body 1 has an upper ridge 14 protruding forward, and the bottom of the front side of the sub-box body 1 has a lower ridge 15 protruding forward. The box door 3 is embedded between the corresponding upper ridge 14 and lower ridge 15, and the front side surfaces of the upper ridge 14 and lower ridge 15 are flush with the front side surfaces of the corresponding box door 3.

[0037] Each sub-box 1 is provided with a box door 3 on the front side, and two adjacent box doors 3 are hingedly connected. Specifically, Figure 5 As shown, the left side of the box door 3 has two recessed embedding grooves 34, and the right side of the box body has two protruding embedding blocks 35. The embedding grooves 34 and the embedding blocks 35 are arranged one by one. The embedding blocks 35 can be embedded in the embedding grooves 34 of the adjacent right box door 3. The two adjacent box doors 3 are hingedly connected by penetrating pins. In actual production, the number of embedding grooves 34 and embedding blocks 35 can be three or four. The top of the box body has a through window hole 110, and a window glass 111 is fixedly connected to the window hole 110. The top of the box body is also hinged with a window cover 112, and the window cover 112 can be rotated to block the window hole 110. The top of the box body has a through water outlet pipe hole 113, the bottom of the box body has a through water inlet pipe hole 114, and the bottom of the box body also has a through drainage hole 115.

[0038] like Figure 3As shown, the left side of the box door 3 located on the far left is locked and fixedly connected with the left side of the main box body 2 through the lock 4. Specifically, the lock 4 includes a rotating member 41 that is axially positioned and circumferentially rotatable and is arranged between the left end cover 5 and the main box body 2. The outer wall of the buckle block 31 located on the far left is provided with an arc-shaped locking groove 33. In actual production, all the buckle blocks 31 are provided with locking grooves 33 to facilitate unified production. Both ends of the locking groove 33 penetrate the side of the buckle block 31. The rotating member 41 includes a rotating part 42 for positioning with a wrench, an arc-shaped locking part 43, and a pushing block 45 located on the side and protruding. The left end cover 5 has a through hole for the wrench part to pass through, and the through hole is arranged opposite to the rotating part 42.

[0039] like Figure 4 As shown, the front end of the locking portion 43 gradually becomes thicker in the clockwise and horizontal direction, and a protruding limit block 44 is provided at the end of the rear end of the locking portion 43. When the locking portion 43 is rotated and embedded in the locking groove 33 and the limit block 44 abuts against the snap-fit ​​block 31 located on the far left, the snap-fit ​​block 31 located on the far left is locked so that the box door 3 is locked on the front side of the main box body 2. A handle 6 is hinged on the left side of the box door 3 located on the far left. The handle 6 is embedded between the left end cover 5 and the sub-box body 1 located on the far left. The front side surface of the handle 6 is flush with the front side surface of the box door 3. Rotating the rotating member 41 can make the pushing block 45 contact and push the handle 6 to rotate around the hinge point.

[0040] The left side of the front side of each sub-box 1 is provided with a first recessed snap-fitting groove 11, and the bottom of the first snap-fitting groove 11 is provided with a snap-fitting rib 12 which is protruded and has an arc-shaped cross-section on the top surface. The left side of each door 3 is provided with a snap-fitting block 31 which is protruded inwardly, and the inner side wall of the snap-fitting block 31 is provided with a recessed positioning groove 32 which has an arc-shaped cross-section. The right side of the front side of each sub-box 1 is provided with a second recessed snap-fitting groove 13, and the second snap-fitting groove 13 is arranged opposite to the first snap-fitting groove 11. When two adjacent sub-boxes 1 are spliced ​​and fixed, the snap-fitting block 31 can be embedded in the space formed by the first snap-fitting groove 11 and the second snap-fitting groove 13. The snap-fitting block 31 is embedded in the space and the snap-fitting rib 12 is embedded in the positioning groove 32 so that the left side of the door 3 is snap-fitted and fixed to the main box 2.

[0041] In the normal state, the snap-fit ​​block 31 is embedded in the corresponding first snap-fit ​​groove 11, the snap-fit ​​rib 12 is embedded in the corresponding positioning groove 32, so that the box door 3 is positioned at the front side of the corresponding sub-box body 1, the locking portion 43 is embedded in the locking groove 33, the limit block 44 is against the snap-fit ​​block 31, and the handle 6 is embedded between the left end cover 5 and the main box body 2, and all the box doors 3 and the main box body 2 are in a locked state. When opening the box door 3, the wrench is connected to the rotating portion 42 and rotated, so that the locking portion 43 leaves the locking groove 33, and the pushing portion pushes the handle 6 to make the handle 6 pop out. The user holds the handle 6 and applies a certain external force to pull the handle 6, so that the snap-fit ​​rib 12 leaves the positioning groove 32, and the snap-fit ​​block 31 is separated from the corresponding sub-box body 1, so that the box doors 3 are opened one by one from left to right; when closing the box door 3, the reverse operation is sufficient.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although the sub-box 1, the first buckling groove 11, the buckling rib 12, the second buckling groove 13, the upper convex strip 14, the lower convex strip 15, the first splicing piece 16, the first splicing groove 17, the second splicing piece 18, the second splicing groove 19, the window hole 110, the window glass 111, the window cover 112, the outlet pipe hole 113, the inlet pipe hole 114, the drain hole 115, the main box 2, the door 3, the buckling block 31, the positioning groove 32, the locking groove 33, the embedding groove 34, the embedding block 35, the lock 4, the rotating member 41, the rotating part 42, the locking part 43, the limit block 44, the pushing block 45, the left end cover 5, the handle 6, the right end cover 7 and other terms are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An extendable water meter box, comprising a main box (2) formed by splicing a plurality of sub-boxes (1), characterized in that All sub-boxes (1) are spliced ​​and fixed in sequence from left to right. Each sub-box (1) is provided with a box door (3) on the front side. Two adjacent boxes (3) are hingedly connected. The right side of the box door (3) located on the far right is hingedly connected to the right side of the main box (2). The left side of the box door (3) located on the far left is locked and fixedly connected to the left side of the main box (2) through a lock (4). The left side of each box door (3) can be buckled and fixed with the main box (2). Applying a certain external force to pull the box door (3) located on the left side can open the adjacent box door (3) on the right side.

2. The extendable water meter box according to claim 1, characterized in that: The left side of the front side of each sub-box (1) has a first buckling groove (11) which is recessed, and the bottom of the first buckling groove (11) has a buckling rib (12) which is protruding and has an arc-shaped cross-section on the top surface. The left side of each box door (3) has a buckling block (31) which is protruding inward, and the inner side wall of the buckling block (31) has a positioning groove (32) which is recessed and has an arc-shaped cross-section. The buckling block (31) is embedded in the first buckling groove (11) and the buckling rib (12) is embedded in the positioning groove (32) so that the box door (3) is buckled and fixed to the main box (2).

3. The extendable water meter box according to claim 2, characterized in that: The right side of the front side of each sub-box (1) has a second buckling groove (13) which is arranged concavely, and the second buckling groove (13) is arranged opposite to the first buckling groove (11). When two adjacent sub-boxes (1) are spliced ​​and fixed, the buckling block (31) can be embedded in the space formed by the first buckling groove (11) and the second buckling groove (13).

4. An extendable water meter box according to claim 2 or 3, characterized in that: The left side of the main housing (2) is fixedly connected with a left end cover (5), and the lock (4) includes a rotating member (41) which is axially positioned and circumferentially rotatable and is arranged between the left end cover (5) and the main housing (2). The outer side wall of the snap-fit ​​block (31) located on the far left is provided with an arc-shaped recessed locking groove (33), and both ends of the locking groove (33) pass through the side of the snap-fit ​​block (31). The rotating member (41) includes a rotating portion (42) for positioning with a wrench and an arc-shaped locking portion (43). When the locking portion (43) is rotated and embedded in the locking groove (33), the snap-fit ​​block (31) located on the far left is locked so that the box door (3) is locked on the front side of the main housing (2).

5. The extendable water meter box according to claim 4, characterized in that: The front end of the locking portion (43) gradually becomes thicker in a clockwise and horizontal direction.

6. The extendable water meter box according to claim 4, characterized in that: The end portion of the rear end of the locking portion (43) is provided with a protruding limiting block (44), and the limiting block (44) can abut against the buckling block (31) located at the far left.

7. The extendable water meter box according to claim 4, characterized in that: A handle (6) is hinged on the left side of the box door (3) located at the far left. The handle (6) is embedded between the left end cover (5) and the sub-box body (1) located at the far left. The front side of the handle (6) is flush with the front side of the box door (3). The side of the rotating member (41) has a protruding push block (45). Rotating the rotating member (41) can make the push block (45) contact and push the handle (6) to rotate around the hinge point.

8. An extendable water meter box according to claim 1, 2 or 3, characterized in that: A right end cover (7) is fixedly connected to the right side of the main box body (2), and the box door (3) located at the rightmost side is hinged to the right end cover (7).

9. An extendable water meter box according to claim 1, 2 or 3, characterized in that: The top of the front side of the sub-box body (1) has an upper convex strip (14) protruding forward, and the bottom of the front side of the sub-box body (1) has a lower convex strip (15) protruding forward. The box door (3) is embedded between the corresponding upper convex strip (14) and lower convex strip (15), and the front side surfaces of the upper convex strip (14) and lower convex strip (15) are flush with the front side surfaces of the corresponding box door (3).

10. An extendable water meter box according to claim 1, 2 or 3, characterized in that: The right side wall of the sub-box (1) is provided with a plurality of protruding first splicing pieces (16) and a plurality of recessed first splicing grooves (17), and the left side wall of the sub-box (1) is provided with a plurality of protruding second splicing pieces (18) and a plurality of recessed second splicing grooves (19); when two adjacent sub-boxes (1) are spliced ​​and fixed, the first splicing piece (16) is embedded in the corresponding second splicing groove (19), and the second splicing piece (18) is embedded in the corresponding first splicing groove (17).

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