A trough type hot-dip galvanizing cable bridge

Abstract

The utility model relates to cable laying equipment technical field especially is involved in a kind of slot type galvanizing cable bridge, including bridge box and the cover plate of detachable connection in bridge box top, the inner wall of frame box is equipped with multiple parallel distribution's clamping groove, detachable connection has partition in each clamping groove, partition is transversely set in bridge box and can be separated into multiple independent cable channels in bridge box, and partition is equipped with the fixing assembly for fixing cable to prevent cable sliding winding;The utility model is by being provided with multiple clamping grooves in the inner wall of bridge box, and inserting partition that can slide along clamping groove in clamping groove, partition is layered and forms independent cable channel to bridge box, to effectively solve the problem of cable accumulation winding;Meanwhile by setting inclined louver type vent in bridge box bottom, and setting air vent in cover plate correspondingly, to form vertical convection between air vent and vent, further accelerate the emission of heat inside bridge box.

Description

Technical Field

[0001] This utility model relates to the field of cable laying equipment technology, and in particular to a trough-type hot-dip galvanized cable tray. Background Technology

[0002] Cable trays are generally used for laying cables, making the cable arrangement aesthetically pleasing. They feature simple structure, attractive appearance, flexible configuration, and convenient maintenance. They can generally be divided into trough type, tray type, ladder type, and mesh type structures. Currently, to improve the corrosion resistance of cable trays, surface galvanization or the use of stainless steel materials is often necessary. Trough-type hot-dip galvanized cable trays have a closed structure with good interference shielding performance, making them suitable for corrosive environments; therefore, they are typically used in outdoor environments.

[0003] However, due to the high sealing of cable trays, their poor air circulation with the outside air results in weak heat dissipation capacity. Although existing cable trays have ventilation holes on the side walls and bottom to facilitate heat dissipation, in high-density cabling scenarios such as data centers, when cables of different sizes and purposes are laid simultaneously, the cables tend to accumulate at the bottom of the cable tray ducts, causing heat buildup that is difficult to dissipate quickly, thus affecting cable lifespan. At the same time, multiple cables laid in the cable tray are also prone to tangling and mess. When replacing or maintaining the cables, the tangled cables need to be straightened and replaced, which is a cumbersome and labor-intensive operation for relevant personnel. Utility Model Content

[0004] In order to address the technical deficiencies mentioned in the background art, the purpose of this utility model is to provide a trough-type hot-dip galvanized cable tray, which aims to solve the problems of weak heat dissipation, easy cable tangling, and cumbersome maintenance of existing trough-type hot-dip galvanized cable trays.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A trough-type hot-dip galvanized cable tray includes a cable tray box and a cover plate detachably connected to the top of the cable tray box. The inner wall of the cable tray box has multiple parallel slots, each slot containing a detachably connected partition plate. The partition plates are horizontally positioned within the cable tray box and divide the interior into multiple independent cable channels. The partition plates also have fixing components for securing cables to prevent slippage and tangling. The bottom of the cable tray box has ventilation holes, and the cover plate has ventilation openings corresponding to these holes. The ventilation holes and openings work together to form a vertical convection channel with bottom air intake and top air exhaust to dissipate heat from the cable tray box.

[0006] Preferably, the fixing component includes elastic buckles and fixing bases. The elastic buckles are evenly distributed on the top partition plate, and each elastic buckle is composed of two symmetrically arranged elastic pieces. One end of each elastic piece is fixed to the partition plate, and the other end is in the shape of a barb. A space for clamping and fixing cables is formed between the two elastic pieces.

[0007] Preferably, the mounting base is fixed to the bottom partition plate by screws, and the mounting base has multiple clip holes for securing cables; the opening direction of the clip holes is parallel to the opening direction of the cable tray box.

[0008] Preferably, the two ends of the partition plate are embedded in the slot and slide along the extension direction of the slot, and an identification slot is reserved on the outer side of the partition plate, into which a label for marking cable information can be inserted.

[0009] Preferably, the ventilation hole has a louvered structure and the opening of the ventilation hole faces upward; the opening angle of the ventilation hole is 30°-60°.

[0010] Preferably, the ventilation opening at the top of the cover plate is a strip structure, and the ventilation opening corresponds one-to-one with the ventilation hole at the bottom, and the ventilation opening is covered with a removable and washable dustproof net.

[0011] Preferably, the cable tray box has a groove-shaped structure, and the inner wall of the cable tray box is also provided with hooks for receiving cables. The hooks are located between two adjacent slots and are axially distributed along the length of the cable tray box.

[0012] Preferably, the top two sides of the cable tray box are bent outward to form a snap-fit ​​portion, and the two sides of the cover plate are bent downward to form a fastening portion that matches the snap-fit ​​portion. The fastening portion and the snap-fit ​​portion are engaged and connected.

[0013] In summary, the beneficial effects of this utility model are as follows: 1. This utility model solves the problem of cable accumulation and tangling by setting multiple slots on the inner wall of the cable tray box and inserting partition plates into the slots. The partition plates slide and adjust along the slots, and can be layered according to the principle of large-diameter cables at the bottom and small-diameter cables at the top to form independent cable channels. At the same time, when laying cables, the cables are respectively clipped into the fixing components of the partition plates, so that the cables in the cable tray box are neatly arranged, which makes the operation simple and convenient for workers to maintain, thereby reducing their workload.

[0014] 2. This utility model provides inclined louvered ventilation holes at the bottom of the cable tray box and corresponding ventilation openings on the cover plate, thereby creating vertical convection between the ventilation openings and ventilation holes. This further accelerates the dissipation of heat inside the cable tray box and avoids the problem of heat not being effectively discharged when there are too many cables, thus improving the cable life. Attached Figure Description

[0015] Figure 1 This is a diagram showing the usage status of the trough-type hot-dip galvanized cable tray of this utility model; Figure 2 This is a schematic diagram of the structure of the trough-type hot-dip galvanized cable tray of this utility model; Figure 3 This is an exploded view of the trough-type hot-dip galvanized cable tray of this utility model; Figure 4 This is a front view of the trough-type hot-dip galvanized cable tray of this utility model; Figure 5 yes Figure 4 A cross-sectional view of the AA plane, where the arrows indicate the direction of vertical convection winds; Figure 6 This is a schematic diagram of the elastic buckle structure in this utility model; Figure 7 This is a structural schematic diagram of the fixed base in this utility model.

[0016] Explanation of the reference numerals in the figure: 1. Cable tray box; 11. Card slot; 12. Ventilation hole; 13. Snap-fit ​​part; 2. Cover plate; 21. Ventilation opening; 22. Fastening part; 3. Divider plate; 31. Marking slot; 4. Fixing component; 41. Elastic buckle; 42. Fixing base; 421. Buckle hole; 5. Dustproof net; 6. Hook. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0018] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation 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, the above terms should not be construed as limitations on this utility model.

[0019] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "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. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0020] The following is in conjunction with the appendix Figure 1-7 The present invention provides a more detailed description of an embodiment of a trough-type hot-dip galvanized cable tray.

[0021] A type of hot-dip galvanized cable tray, such as Figures 1 to 3 As shown, the cable tray box 1 includes a cover plate 2 detachably connected to the top of the cable tray box 1. The inner wall of the cable tray box 1 has multiple parallel slots 11, and each slot 11 is detachably connected to a partition plate 3. The partition plate 3 is horizontally arranged inside the cable tray box 1 and can divide the inside of the cable tray box 1 into multiple independent cable channels. The partition plate 3 is provided with a fixing component 4 for fixing the cables to prevent the cables from sliding and tangling. The bottom of the cable tray box 1 has a ventilation hole 12, and the cover plate 2 has a ventilation opening 21 at the position corresponding to the ventilation hole 12. The ventilation hole 12 and the ventilation opening 21 cooperate to form a vertical convection channel with air intake at the bottom and air exhaust at the top to exhaust the heat inside the cable tray box 1.

[0022] Specifically, the inner wall of the cable tray box 1 is provided with multiple slots 11, and partition plates 3 are inserted into the slots 11. The partition plates 3 can slide and adjust along the slots 11 to separate the cables into layers according to the large diameter cables at the bottom and the small diameter cables at the top, forming independent cable channels, thereby effectively solving the problem of cable accumulation and tangling. At the same time, when laying cables, the cables are respectively inserted into the fixing components 4 of the partition plates 3, so that the cables in the cable tray box 1 are neatly arranged, making the operation simple and convenient for the staff during maintenance, thereby reducing their workload. In addition, by setting inclined louvered ventilation holes 12 at the bottom of the cable tray box 1, and setting ventilation openings 21 correspondingly on the cover plate 2, vertical convection is formed between the ventilation openings 21 and the ventilation holes 12, which further accelerates the heat dissipation inside the cable tray box and avoids the problem of heat not being effectively discharged when there are too many cables, thereby improving the cable life.

[0023] It is worth noting that, in order to prevent the partition plate 3 from sliding freely in the slot 11, a hemispherical positioning recess can be made every 100mm on the inner wall of the slot 11. Hemispherical elastic protrusions are set at corresponding positions at both ends of the partition plate 3. The elastic protrusions are made of hot-dip galvanized steel wire and their diameter is matched with the recess. When the partition plate 3 slides to the target position, the protrusion will be engaged with the recess, realizing the temporary positioning of the partition plate 3, thereby avoiding the problem of the partition plate 3 sliding on its own without external force.

[0024] In this embodiment, as Figure 3 and Figure 7 As shown, the fixing component 4 includes elastic buckles 41 and fixing base 42. The elastic buckles 41 are evenly distributed on the top partition plate 3, and each elastic buckle 41 is composed of two symmetrically arranged elastic pieces. One end of the elastic piece is fixed on the partition plate 3, and the other end is in the shape of a barb. A space for clamping and fixing cables is formed between the two elastic pieces.

[0025] Specifically, one end of the elastic sheet is fixed to the partition plate 3 by resistance spot welding, while the other end is hooked to prevent the cable from slipping out of the elastic sheet. An initial clamping space of 10mm-20mm is formed between the two elastic sheets, which can be expanded to 30mm by the deformation of the elastic sheet. When laying small-diameter cables on the upper layer, the worker holds one end of the cable and presses it down along the clamping space between the two elastic sheets, causing the cable to squeeze the elastic sheet and undergo elastic deformation, thereby expanding the clamping space. After the cable is fully inserted into the space, the elastic sheet returns to its original position under its own elastic restoring force, and clamps the outer wall of the cable with its hooked end, forming a double limit along the length of the cable tray and in the direction perpendicular to the partition plate 3, preventing the cable from sliding or detaching due to vibration or gravity. Each cable has an independent elastic clip 41, which can prevent multiple cables from crossing or stacking on the same plane and solve the problem of cables tangling when laying high-density cables. At the same time, no tools are required for installation or removal. Cable fixing or removal can be completed manually. For example, when removing the cable, pulling it upward will open the elastic clip again. Compared with the traditional method of fixing cables with cable ties, the elastic clip 41 can greatly improve installation efficiency.

[0026] In this embodiment, as Figure 3 and Figure 7 As shown, the mounting base 42 is fixed to the bottom partition plate 3 by screws, and the mounting base 42 has multiple clip holes 421 for attaching cables; the opening direction of the clip holes 421 is parallel to the opening direction of the cable tray box 1.

[0027] Specifically, the mounting base 42 is made of hot-dip galvanized steel sheet and its width is the same as that of the partition plate 3. It has 4-6 U-shaped snap-fit ​​holes 421 on its surface, the specific number of which can be set according to the width of the cable tray box 1. The diameter of the snap-fit ​​holes 421 is designed according to the target cable diameter to ensure that the outer wall of the cable fits snugly against the hole wall. The opening direction of all snap-fit ​​holes 421 is parallel to the opening direction of the cable tray box 1 and perpendicular to the surface of the partition plate 3. When laying large-diameter cables at the bottom layer, the worker vertically inserts the cable into the snap-fit ​​holes 421 of the mounting base 42 from above. Because the snap-fit ​​holes 421 open upwards and their diameter matches the cable diameter, the cable is circumferentially limited by the hole wall after insertion and cannot slide laterally along the partition plate 3. Simultaneously, the mounting base 42 is rigidly connected to the partition plate 3 by screws, and the partition plate 3 is embedded in the slot 11, forming a stable connection, which prevents the cable from accumulating at the bottom of the cable tray box 1 due to its own weight.

[0028] Compared to the elastic clamping of the elastic buckle 41, the rigid fixation of the fixing base 42 can withstand greater cable weight, solving the problem that large-diameter cables at the bottom layer are prone to bending the partition plate 3 or stacking and deforming. Moreover, the fixed position of the buckle hole 421 can realize the equidistant arrangement of cables along the length of the cable tray, avoiding local accumulation caused by the random movement of cables at the bottom layer. If it is necessary to replace the bottom layer cable, simply take the cable out vertically upward from the buckle hole 421 without disassembling the fixing base 42. Compared with the traditional cable tie wrapping, the maintenance time is shorter and the efficiency is higher.

[0029] In this embodiment, as Figure 5 , 6 As shown, the two ends of the partition plate 3 are embedded in the slot 11 and slide along the extension direction of the slot 11. A marking slot 31 is reserved on the outside of the partition plate 3, and a label for marking cable information can be inserted into the marking slot 31.

[0030] Specifically, after the cables are laid, staff print corresponding PC labels based on the actual information of each cable, align the positioning ribs of the labels with the positioning slots of the labeling slots 31, and insert the labels into the slots. The cooperation between the positioning ribs and the positioning slots prevents the labels from falling off due to vibration or rain. During maintenance, staff only need to observe the labels on the outside of the partition plate 3 to quickly identify the target cable. If it is necessary to update the cable information, the old label can be directly removed and the new label inserted, making the operation convenient.

[0031] In this embodiment, as Figure 3 and Figure 5 As shown, the ventilation hole 12 has a louvered structure, and the opening of the ventilation hole 12 is oriented upwards; the opening tilt angle of the ventilation hole 12 is 30°-60°.

[0032] Specifically, the bottom of the cable tray box 1 is made of louvered ventilation holes 12 using a stamping process. The edges of the holes are folded upwards to form louvered wings, and the folding angle is preferably 30° in this embodiment. The ventilation holes 12 are evenly distributed along the length of the cable tray box 1. When the cables inside the cable tray box 1 generate heat, the internal air temperature rises, and the hot air flows upwards due to its lower density. At this time, cold air from the outside enters through the louvered ventilation holes 12 at the bottom. Since the openings face upwards, the cold air can easily pass through the holes and enter the interior, filling the space left by the rising hot air. The hot air continues to rise to the cover plate 2 and is discharged from the ventilation opening 21 of the cover plate 2, forming a vertical convection circulation of bottom air intake, internal heat exchange, and top air exhaust, thereby quickly removing the internal heat.

[0033] It should be noted that when the cable tray box 1 of this utility model is used outdoors, rainwater falling vertically to the bottom of the cable tray box 1 will be blocked by the convex structure of the louvered wings and will not directly enter the interior of the ventilation hole 12; a small amount of rainwater flowing along the wing surface will drip down along the bottom edge of the cable tray box 1 due to gravity and will not seep into the interior; most of the dust particles in the air will be intercepted by the louvered wings on the bottom outside, and only a small amount of fine dust may enter the interior of the cable tray box 1 through the ventilation hole 21. At the same time, this part of the dust can be further filtered by the dustproof net 5 on the cover plate 2.

[0034] In this embodiment, as Figure 3 and Figure 5 As shown, the ventilation opening 21 at the top of the cover plate 2 is a strip structure, and the ventilation opening 21 corresponds one-to-one with the ventilation hole 12 at the bottom. The ventilation opening 21 is covered with a removable and washable dustproof net 5.

[0035] Specifically, the cover plate 2 is made of hot-dip galvanized steel sheet, with ventilation openings 21 along its length. Each ventilation opening 21 corresponds one-to-one with the louvered ventilation holes 12 at the bottom, meaning there is a ventilation opening 21 directly above each set of bottom ventilation holes 12, ensuring unobstructed airflow. The dustproof mesh 5 is made of nylon mesh and cut into a rectangle to fit the inner side of the cover plate 2, with a 5mm-10mm mounting edge pre-installed. This mounting edge is fixed to the inner side of the cover plate 2 by adhesive bonding. When hot air rises from the cable tray box 1 to the cover plate 2, it is exhausted to the outside through the ventilation openings 21. Because the ventilation openings 21 correspond one-to-one with the bottom ventilation holes 12, forming a vertical straight airflow channel, it avoids heat dissipation dead zones caused by hot air circulating internally.

[0036] When outside air enters the cable tray box 1 through the ventilation opening 21, the dust particles carried in the air are intercepted by the mesh of the dustproof net 5, preventing dust from adhering to the surface of the cable. When the dustproof net 5 has been used for a certain period of time or when its surface is covered with a lot of dust, the staff can remove the cover plate 2, manually pry open the elastic buckle 41, remove the dustproof net 5 for cleaning, and reinstall it after drying to achieve reuse.

[0037] In this embodiment, as Figure 4 As shown, the cable tray box 1 has a groove-shaped structure, and the inner wall of the cable tray box 1 is also provided with hooks 6 for receiving cables. The hooks 6 are located between two adjacent slots 11, and the hooks 6 are axially distributed along the length direction of the cable tray box 1.

[0038] Specifically, hooks 6 are made of hot-dip galvanized steel wire bent into a J-shape and fixed to the inner wall of the cable tray box 1 by resistance spot welding. The hooks 6 are installed between two adjacent slots 11, and are equidistantly distributed along the length of the cable tray box 1, with a spacing of 100mm-150mm between adjacent hooks 6. The fixed height of hooks 6 matches the height of the middle layer partition plate 3, thus avoiding interference with the cables on the partition plate 3. When laying medium-diameter cables in the middle layer, workers can place the cables in the J-shaped hook opening of hook 6. The width of the hook opening matches the cable diameter, and the cable is limited by the hook opening after placement, preventing it from sliding along the vertical length of the cable tray. Simultaneously, the equidistant distribution of hooks 6 along the length allows for suspended cable arrangement, creating a staggered layout with the cables on the middle layer partition plate 3, thus preventing excessive accumulation of middle layer cables and further improving installation efficiency.

[0039] In this embodiment, as Figure 4 As shown, the top two sides of the cable tray box 1 are bent outward to form a snap-fit ​​part 13, and the two sides of the cover plate 2 are bent downward to form a fastening part 22 that matches the snap-fit ​​part 13. The fastening part 22 and the snap-fit ​​part 13 are engaged and connected.

[0040] Specifically, the top two sides of the cable tray box 1 are bent outward by 180° to form a snap-fit ​​part 13 with a width of 5mm-8mm. The folded edge surface is flat and perpendicular to the side wall of the cable tray box 1. The two sides of the cover plate 2 are bent downward by 90° to form a vertical edge with a height of 10mm-15mm. The end of the vertical edge is then bent inward by 30° to form a fastening part 22. The width of the hook is adapted to the folded edge width of the snap-fit ​​part 13. At the same time, a layer of nitrile rubber sealing gasket is pasted on the folded edge surface of the snap-fit ​​part 13. When the fastening part 22 and the snap-fit ​​part 13 are engaged, the sealing gasket will be squeezed and deformed to fill the gap between the two, thereby ensuring a sealed connection between the cover plate 2 and the cable tray box 1.

[0041] The following uses a high-density cabling scenario in a data center as an example to explain in detail the implementation process of this utility model: First, count the type, diameter, and quantity of the cables to be laid; for example: 3 power cables, 20mm in diameter; 10 data cables, 6mm in diameter; 5 monitoring cables, 10mm in diameter. Then, fix the cable tray box 1 to the bracket on the ceiling or wall of the computer room using expansion bolts, ensuring that the cable tray box 1 is horizontal; and insert the corresponding number of partition plates 3 into the cable tray box 1, wherein; Bottom partition plate 3: For power cables with a diameter of 20mm, select the first set of slots 11 on the inner wall of the cable tray box 1, 20mm from the bottom, insert the partition plate 3, slide it to the positioning recess and lock it; and put the three power cables vertically into the buckle holes 421 of the fixing seat 42 respectively, ensuring that the cables are in close contact with the hole wall and there is no looseness; Middle layer partition plate 3: For monitoring cables with a diameter of 10mm, select the third middle slot 11, 60mm from the bottom, insert the partition plate 3, and slide it into position; and place the 5 monitoring cables on the hooks 6 between the middle slots 11 respectively, with each cable corresponding to 2-3 hooks 6 to ensure stable cable suspension; Upper partition 3: For data cables with a diameter of 6mm, select the fifth slot 11 at the top, 100mm from the bottom, insert the partition 3, and slide it into position; then press the 10 data cables into the elastic buckles 41 of the upper partition 3 respectively, and after the elastic piece resets, it will lock the cables to prevent slippage; Finally, cover the top of the cable tray box 1 with the cover plate 2, align the snap-fit ​​part 13 and the fastening part 22, press down on both sides to make the hooks lock the folded edges, and complete the sealing installation.

[0042] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A trough-type hot-dip galvanized cable tray, comprising a tray box and a cover plate detachably connected to the top of the tray box, characterized in that, The inner wall of the cable tray box has multiple parallel slots, and each slot is detachably connected to a partition plate. The partition plate is horizontally positioned inside the cable tray box and can divide the interior of the cable tray box into multiple independent cable channels. The partition plate is equipped with fixing components for fixing cables to prevent them from sliding and tangling. The bottom of the cable tray box has ventilation holes, and the cover plate has ventilation openings at the corresponding positions of the ventilation holes. The ventilation holes and ventilation openings cooperate to form a vertical convection channel with air entering from the bottom and exiting from the top to dissipate heat from inside the cable tray box.

2. The trough-type hot-dip galvanized cable tray according to claim 1, characterized in that, The fixing component includes elastic buckles and fixing bases. The elastic buckles are evenly distributed on the top partition plate, and each elastic buckle is composed of two symmetrically arranged elastic pieces. One end of each elastic piece is fixed to the partition plate, and the other end is in the shape of a barb. A space for clamping and fixing cables is formed between the two elastic pieces.

3. The trough-type hot-dip galvanized cable tray according to claim 2, characterized in that, The mounting base is fixed to the bottom partition plate by screws, and the mounting base has multiple clip holes for cable clamping; the opening direction of the clip holes is parallel to the opening direction of the cable tray box.

4. The trough-type hot-dip galvanized cable tray according to claim 2, characterized in that, The two ends of the partition plate are embedded in the slots and slide along the extension direction of the slots. The outer side of the partition plate has a reserved marking slot, into which a label for marking cable information can be inserted.

5. The trough-type hot-dip galvanized cable tray according to claim 4, characterized in that, The ventilation holes have a louvered structure, and the openings of the ventilation holes face upwards; the opening angle of the ventilation holes is 30°-60°.

6. The trough-type hot-dip galvanized cable tray according to claim 5, characterized in that, The ventilation openings at the top of the cover plate are strip-shaped structures, and each ventilation opening corresponds to a ventilation hole at the bottom. The ventilation openings are covered with a removable and washable dustproof net.

7. The trough-type hot-dip galvanized cable tray according to claim 6, characterized in that, The cable tray box has a groove-shaped structure, and the inner wall of the cable tray box is also provided with hooks for receiving cables. The hooks are located between two adjacent slots and are axially distributed along the length of the cable tray box.

8. The trough-type hot-dip galvanized cable tray according to claim 7, characterized in that, The top two sides of the cable tray box are bent outward to form a snap-fit ​​part, and the two sides of the cover plate are bent downward to form a fastening part that matches the snap-fit ​​part. The fastening part and the snap-fit ​​part are engaged and connected.

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