Vertical channel structure of low-voltage drawer cabinet

Abstract

The utility model relates to a vertical channel structure of a low-voltage drawer cabinet, and belongs to the technical field of electrical equipment. According to the structure, a function plate is arranged on the face, facing the interior of the cabinet, of a vertical row set, splicing modules for isolating adjacent vertical rows are fixed between a vertical row cover plate and the function plate, and the vertical row cover plate, the function plate and the splicing modules are combined to form an isolation body for isolating the periphery of each vertical row. At least two groups of isolators which are vertically arranged are fixed on the vertical row, the length of the isolator group is matched with the length of the vertical row, a bottom sealing plate is arranged on the bottom surface of the isolator at the bottom of the vertical row, and the bottom sealing plate is fixedly connected with a bottom support between side plates of the vertical row; and the vertical row side plate is provided with a reinforcing support for limiting the displacement of the vertical row cover plate. According to the utility model, complete isolation between phases of the vertical copper bars is realized through a specific structural form, and a heat dissipation channel is reserved, so that the temperature rise of the vertical copper bars is controlled within an allowable range, thereby improving the reliability and safety of the use of the drawer cabinet.

Description

Technical Field

[0001] The utility model relates to a vertical channel structure of a low-voltage drawer cabinet, belonging to the technical field of electrical equipment. Background Art

[0002] The drawer-type low-voltage switchgear is widely used as a centralized control power distribution center in various industries with high power supply reliability requirements due to its high reliability, safe and simple operation, convenient maintenance, and compact space. The vertical copper busbar in the vertical channel is the power distribution core of the drawer cabinet, and it is extremely important to ensure its safety and stability. The existing vertical channel copper busbar protection structure has two forms: insulation material protection and sheet metal protection. No matter which type, the vertical busbar is protected as a whole. There is no protection between the phases of the vertical busbar and between adjacent distribution units. If a single-phase short circuit occurs in a distribution unit during operation, the arc generated is very likely to affect other phases and adjacent distribution units, thereby causing a short circuit between all distribution units and causing serious circuit failures. However, if the phases are completely isolated with insulating materials, such as the "A Low-voltage Drawer Cabinet Fully Insulated Vertical Channel Structure" previously applied by the applicant, with patent number 202322305184.X, it will lead to poor heat dissipation of the vertical copper busbar, causing the vertical copper busbar to exceed the temperature rise standard, resulting in increased resistance and reduced current carrying capacity, which is very likely to cause accidents in the long run. Utility Model Content

[0003] The purpose of the utility model is to propose a low-voltage drawer cabinet vertical channel structure in view of the defects of the prior art, which realizes complete isolation between vertical row phases through a specific structural type, and retains the heat dissipation channel, so that the temperature rise of the vertical copper busbar is controlled within the allowable range, thereby improving the reliability and safety of the drawer cabinet.

[0004] The utility model solves the technical problem through the following technical scheme: a vertical channel structure of a low-voltage drawer cabinet, comprising a vertical row group formed by vertical rows, symmetrical vertical row side panels are arranged on both sides of the vertical row group, a vertical row cover plate is provided on the side of the vertical row group facing outside the cabinet, a functional panel is provided on the side of the vertical row group facing inside the cabinet, at least one group of splicing modules is fixed between the vertical row cover plate and the functional panel for isolating adjacent vertical rows, the vertical row cover plate, the functional panel and the splicing module are combined to form an isolation body isolating each vertical row on all sides, at least two groups of isolation bodies arranged vertically are fixed on the vertical row, the length of the isolation body group is matched with the length of the vertical row, a bottom sealing plate is provided on the bottom surface of the isolation body located at the bottom of the vertical row, the bottom sealing plate is connected and fixed to the bottom support between the vertical row side panels, and the vertical row side panels are provided with reinforcing supports for limiting the displacement of the vertical row cover plates.

[0005] The utility model further achieves the purpose of the utility model through the following technical solutions: the front and rear ends of the vertical row of side panels have folded edges, the folded edges are provided with first fixing holes for fixing the functional panels and the reinforcement brackets, and the vertical row of side panels are provided with support fixing holes for fixing the bottom supports.

[0006] A first copper bar groove matching with the vertical row is provided on the back of the function board, and a first plug structure matching with the splicing module is provided on the board body between the first copper bar grooves, and the first plug structure contains a cylindrical boss and interlaced baffles located on both sides of the cylindrical boss, and a blind hole is provided on the surface of the cylindrical boss, and a metal inlaid nut is provided inside; an anti-mistaken touch baffle is provided on the front of the function board at the first copper bar groove; second fixing holes matching with the first fixing holes are provided on both sides of the function board; a first baffle is provided at the bottom of the function board, and a first groove matching with the first baffle is provided at the top.

[0007] A first socket structure is provided on the front side of the splicing module, and the first socket structure contains a cylindrical groove that cooperates with the cylindrical boss and a slot that nests with the interlaced baffle, and a through hole is provided on the bottom surface of the cylindrical groove; a second plug structure that is the same as the first plug structure is provided on the back side of the splicing module; evenly distributed protective baffle groups are provided on both sides of the splicing module, and each group of protective baffles is arranged in a left-right cross maze pattern; a second baffle is provided at the bottom of the splicing module, and a second groove that nests with the second baffle is provided on the top.

[0008] The front side of the vertical row cover plate is provided with a second socket structure identical to the first socket structure, a second copper row groove matching the thickness of the vertical row, and staggered through holes; the back side of the vertical row cover plate is provided with reinforcing ribs arranged in a cross shape; the bottom of the vertical row cover plate is provided with a third baffle, and the top is provided with a third groove nested with the third baffle.

[0009] The function board, the splicing module and the vertical row cover plate are fixed by fasteners. When fixed, the first copper bar groove on the function board and the second copper bar groove on the vertical row cover plate press the vertical copper bar, the first plug structure on the function board is plugged into the first socket structure on the splicing module, and the second plug structure on the splicing module is plugged into the second socket structure on the vertical row cover plate; the blind holes on the function board, the through holes on the splicing module and the through holes on the vertical row cover plate are combined to form a channel for accommodating the fasteners.

[0010] The bottom support has folded edges on both sides, and the folded edges are provided with third fixing holes that match the support fixing holes of the vertical row of side panels. The top of the bottom support is connected to the bottom sealing plate.

[0011] A baffle groove matched with each baffle is provided on the top of the bottom sealing plate, and a rectangular boss in contact with the bottom of the vertical copper bar is provided between the baffle grooves, the width of the rectangular boss is less than the thickness of the vertical copper bar, and the distance between the rectangular bosses is the same as the spacing of each copper bar groove. A fixing hole for connecting fasteners is provided at the baffle groove, and the fixing hole is a countersunk hole; an air inlet is provided on the front of the bottom sealing plate, and the left and right positions and depths of the air inlet are matched with the protective baffle of the splicing module, and a ventilation hole matched with the protective baffle is provided on the top of the air inlet, and the air inlet and the ventilation hole cooperate to form an "L"-shaped air inlet duct.

[0012] The reinforcing support is composed of a vertical surface, the front and rear ends of the vertical surface have front and rear folded edges facing the vertical row of side plates and perpendicular to the vertical surface, and the lower end of the vertical surface has a lower folded edge away from the vertical row of side plates and perpendicular to the vertical surface.

[0013] The reinforcing supports are fixed on the vertical row side panels in an alternating manner up and down, and the back of the vertical surface is fitted with the side surface of the vertical row cover plate to limit the left and right displacement of the vertical row cover plate; the rear folded edge is fitted with the inside of the vertical row side panel and cooperates with the vertical surface to limit the left and right displacement of the vertical row cover plate; the lower folded edge is fitted with the back of the vertical row cover plate to limit the front and rear displacement of the vertical row cover plate.

[0014] The beneficial effects of the utility model are as follows: full closure between phases is achieved through the combined design of the functional board, the splicing module and the vertical row cover plate, and the heat dissipation channel is increased to reduce the temperature rise, and the large gaps on both sides of the vertical copper busbar are eliminated, which can prevent foreign objects from falling from above into the vertical channel to cause leakage, thereby greatly improving the safety of the product; the nesting between the upper and lower layers of the functional board and the vertical row cover plate and the bottom structure can prevent the loss of insulation caused by the shrinkage and deformation of the material, thereby improving the safety; the screws for fixing the front and rear of the functional board and the vertical row cover plate can improve the strength of the product, and the original rear vertical busbar clamp parts are eliminated, thereby reducing the cost of mold opening; the reinforcement support has significantly improved the structural support strength, avoiding poor installation due to processing errors and improving the installation efficiency; the existence of the splicing module reduces the variety of products and reduces the mold opening cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-side view of an embodiment of the utility model.

[0016] Figure 2 for Figure 1 Enlarged view of part A.

[0017] Figure 3 for Figure 1 Three views of the middle vertical row of side panels.

[0018] Figure 4 for Figure 1Main view of the middle function panel.

[0019] Figure 5 for Figure 4 Top view of the .

[0020] Figure 6 for Figure 5 Rear view of.

[0021] Figure 7 for Figure 1 The main view of the splicing module.

[0022] Figure 8 for Figure 7 Side view of.

[0023] Fig. 9 for Figure 7 Rear view of.

[0024] Fig.10 for Figure 1 Front view of the middle vertical row of covers.

[0025] Fig.11 for Fig.10 Rear view of.

[0026] Fig.12 for Fig.10 Top view of the .

[0027] Fig.13 for Figure 1 Front view of the middle isolator.

[0028] Fig.14 for Fig.13 Top view of the .

[0029] Fig.15 for Fig.13 sectional view of .

[0030] Fig.16 for Figure 1 Three-sided view of the mid-bottom support.

[0031] Fig.17 for Figure 1 Front view of the middle bottom cover.

[0032] Fig.18 for Fig.17 sectional view of .

[0033] Fig.19 for Fig.17 Top view of the .

[0034] Fig. 20 for Figure 1 Three-sided view of the reinforcement support.

[0035] Fig.21 for Figure 1 Enlarged view of part B. DETAILED DESCRIPTION Example

[0036] The structure of this embodiment is as follows Figure 1-Figure 21 As shown, a vertical channel structure of a low-voltage drawer cabinet includes a vertical row group formed by vertical rows, symmetrical vertical row side panels 1 are arranged on both sides of the vertical row group, a vertical row cover plate 4 is provided on the side of the vertical row group facing outside the cabinet, a functional panel 2 is provided on the side of the vertical row group facing inside the cabinet, at least one group of splicing modules 3 is fixed between the vertical row cover plate and the functional panel to isolate adjacent vertical rows, the vertical row cover plate 4, the functional panel 2 and the splicing module 3 are combined to form an isolation body isolating each vertical row around, at least two groups of isolation bodies arranged vertically are fixed on the vertical row 5, the length of the isolation body group is matched with the length of the vertical row 5, a bottom sealing plate 7 is provided on the bottom surface of the isolation body located at the bottom of the vertical row 5, the bottom sealing plate 7 is connected and fixed to the bottom support 6 between the vertical row side panels 1, and the vertical row side panels 1 are provided with a reinforcing support 8 for limiting the displacement of the vertical row cover plate 4.

[0037] The specific structure of each component is as follows:

[0038] The vertical row side panels 1 are formed by bending sheet metal and are in a "U" shape. Front and rear fixing holes 1-1 are provided on the front and back to fix the functional panels 2 and the reinforcement supports 8; support fixing holes 1-2 are provided on the sides to match the fixing holes 6-1 on both sides of the bottom support 6 to fix the bottom support 6 on the vertical row side panels 1.

[0039] The functional board 2 is made of nylon material by injection molding, and a plug structure 23-1 is provided on the back, including a cylindrical boss 23-1-1 and a phase baffle 23-1-2. The cylindrical boss 23-1-1 and the cylindrical grooves and 34-1-1 in the socket structure 34-1 of the splicing module 3 are nested with each other to play a positioning and fixing role; the phase baffle 23-1-2 and the slot 34-1-2 in the socket structure 34-1 of the splicing module 3 are nested with each other to play a positioning and fixing role, and achieve complete isolation between phases; a blind hole 2-2 is provided on the surface of the back cylindrical boss 23-1-1, and a metal insert nut is provided inside for fastener matching and fixing; a copper row groove 2-3 is provided on the back, and the width of the copper row groove is the same as the vertical The thickness of the vertical row 5 matches. When in use, fasteners are used to lock the function board 2, the splicing module 3, and the vertical row cover plate 4. The copper row groove 2-3 and the copper row groove 4-2 on the front of the vertical row cover plate 4 will press the vertical row 5 to fix the vertical row 5; a baffle 2-4 is provided at the bottom and a groove 2-5 is provided at the top. When the function boards 2 are stacked up and down for use, the baffle 2-4 and the groove 2-5 are nested and matched up and down to prevent insulation loss caused by material shrinkage and deformation; an anti-mistaken touch baffle 2-6 is provided at the copper row groove on the front to prevent accidental touching of the vertical row on the front during maintenance; a fixing hole 2-7 is provided on the front to match the front and rear fixing holes 1-1 of the vertical row side panel 1, so that the function board 2 is fixed on the vertical row side panel 1.

[0040] The splicing module 3 is made of nylon material by injection molding, and a socket structure 34-1 is provided on the front, including a cylindrical groove 34-1-1 and a slot 34-1-2. The cylindrical groove 34-1-1 and the cylindrical boss 23-1-1 in the plug structure 23-1 of the function board 2 or the splicing module 3 are mutually nested to play a positioning and fixing role; the slot 34-1-2 and the interphase baffle in the plug structure 23-1 of the function board 2 or the splicing module 3 are mutually nested to play a positioning and fixing role, and achieve complete isolation between phases; the bottom surface of the front cylindrical groove 34-1-1 is provided with a through hole 3-2 as a fastener channel;

[0041] Protective baffles 3-3 are arranged on both sides, which are arranged in a cross-maze pattern on the left and right sides, which prevent foreign objects from entering the vertical channel while retaining the ventilation duct. After assembly, the ventilation duct is close to the middle of the vertical row 5, and the heat dissipation performance is excellent;

[0042] A plug structure 23-1 is provided on the back, which is the same as the plug structure 23-1 on the back of the functional board 2; a baffle 3-5 is provided on the bottom and a groove 3-6 is provided on the top. When the splicing modules 3 are stacked up and down for use, the baffle 3-5 and the groove 3-6 are nested and matched up and down to prevent insulation loss caused by material shrinkage and deformation.

[0043] The vertical row cover plate 4 is made of nylon material by injection molding, and a socket structure 34-1 is provided on the front side, which is the same as the socket structure 34-1 on the front side of the splicing module 3; a copper row groove 4-2 is provided on the front side, and the width of the copper row groove matches the thickness of the vertical row 5. When in use, fasteners are used to lock the function board 2, the splicing module 3, and the vertical row cover plate 4. The copper row groove 4-2 and the copper row groove 2-3 on the front side of the function board 2 will press the vertical row 5 to fix the vertical row 5; a baffle 4-3 is provided at the bottom and a groove 4-4 is provided at the top. When the vertical row cover plates 4 are stacked up and down for use, the baffle 4-3 and the groove 4-4 are nested and matched up and down to prevent insulation loss caused by material shrinkage and deformation; through holes 4-5 are provided on the front side, which are staggered up and down, so that each splicing module 3 is connected to the function board 2 and the vertical row cover plate 4 by a fastener, thereby achieving the purpose of fixing the copper row, reducing the number of fasteners, and saving material and labor costs; reinforcing ribs 4-6 are provided on the back side, which are arranged in a cross shape to increase the structural strength.

[0044] The vertical row 5 is a hard copper busbar with a rectangular or rounded rectangular cross section, which plays the role of transmitting current and connecting electrical equipment in the drawer cabinet.

[0045] The bottom support 6 is formed by bending sheet metal material, and has fixing holes 6-1 on both sides, which match the support fixing holes 1-2 on the front of the vertical row of side panels, and are used to fix the bottom support 6 on the vertical row of side panels 1; the top is provided with a sealing plate fixing hole 6-2, which matches the bottom sealing plate 7 fixing hole 7-1, and is used to fix the bottom sealing plate 7 on the bottom support 6.

[0046] The bottom sealing plate 7 is made of insulating material by milling, and a fixing hole 7-1 is provided on the top, which is in the shape of a countersunk hole, so that the fastener can be sunk into the bottom sealing plate 7. The fixing hole 7-1 matches the sealing plate fixing hole 6-2 on the top of the bottom sealing plate 7, and is used to fix the bottom sealing plate 7 to the top of the bottom support 6; a baffle groove 7-2 is provided on the top, which is nested with the baffles 2-4, 3-3, and 4-5 at the bottom of the functional board 2, the splicing module 3, and the vertical row cover plate 4 to prevent insulation loss caused by material shrinkage and deformation; a rectangular boss 7-3 is provided on the top, the width of which is slightly smaller than the thickness of the vertical row 5, and the distance between the bosses is the same as that of the functional board 2 and the vertical row cover plate 4. 4, the spacing between the copper bar grooves 2-3 and 4-2 is consistent, which is used to raise the vertical row 5 to prevent insulation loss caused by material shrinkage and deformation; an air inlet 7-4 is provided on the front, and the left and right positions and depth dimensions match the protective baffles 3-3 on both sides of the splicing module 3 to play a role in air intake; a ventilation hole 7-5 is provided on the top of the air inlet 7-4, and its position matches the protective baffles 3-3 on both sides of the splicing module 3 to play a role in air intake; the air inlet 7-4 and the ventilation hole 7-5 cooperate to form an "L"-shaped air inlet duct, which uses the chimney effect to dissipate heat for the vertical row 5, and prevents maintenance personnel from directly contacting the copper bar, thereby ensuring safety.

[0047] The reinforcing support 8 is formed by bending sheet metal material, and consists of a vertical surface 8-2, the front and rear ends of the vertical surface 8-2 have front and rear folded edges 8-3 facing the vertical row of side panels 1 and perpendicular to the vertical surface 8-2, and the lower end of the vertical surface 8-2 has a lower folded edge 8-4 away from the vertical row of side panels 1 and perpendicular to the vertical surface 8-2. The reinforcing supports 8 are fixed on the vertical row side panels 1 on both sides in an alternating manner up and down, so as to play a reinforcing role and prevent the electric force generated in the event of a short circuit from destroying the overall structure of the vertical channel. A support fixing hole 8-1 is provided on the front folding edge, which matches the front and rear fixing holes 1-1 of the vertical row side panels 1, and is used to fix the reinforcing supports 8 on the vertical row side panels 1; the size of the vertical surface 8-2 allows the reinforcing supports 8 to be tightly attached to the side surfaces of the vertical row cover panels 4 after being fixed, thereby limiting the left and right displacement of the vertical row cover panels 4; the size of the rear folding edge 8-3 allows the reinforcing supports 8 to be tightly attached to the inner side surfaces of the vertical row side panels 1 after being fixed, and cooperates with the vertical surface 8-2 to limit the left and right displacement of the vertical row cover panels 4; the size of the lower folding edge 8-4 allows the reinforcing supports 8 to be tightly attached to the back surfaces of the vertical row cover panels 4 after being fixed, thereby limiting the front and rear displacement of the vertical row cover panels 4.

[0048] When the functional board 2 , the splicing module 3 , the vertical row cover plate 4 , and the vertical row 5 are matched, different numbers of the splicing modules 3 can be selected according to different specifications of the vertical copper row 6 .

[0049] In addition to the above implementations, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A vertical channel structure of a low-voltage drawer cabinet, comprising a vertical row group formed by vertical rows, symmetrical vertical row side panels are arranged on both sides of the vertical row group, and a vertical row cover plate is arranged on one side of the vertical row group facing the outside of the cabinet, characterized in that: A functional panel is provided on one side of the vertical row group facing the inside of the cabinet, at least one group of splicing modules is fixed between the vertical row cover plate and the functional panel for isolating adjacent vertical rows, the vertical row cover plate, the functional panel and the splicing modules are combined to form an isolation body isolating each vertical row on all sides, at least two groups of isolation bodies arranged vertically are fixed on the vertical row, the length of the isolation body group is matched with the length of the vertical row, a bottom sealing plate is provided on the bottom surface of the isolation body located at the bottom of the vertical row, the bottom sealing plate is connected and fixed to the bottom support between the vertical row side panels, and the vertical row side panels are provided with reinforcing supports for limiting the displacement of the vertical row cover plates.

2. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: The front and rear ends of the vertical row of side panels are provided with folded edges, the folded edges are provided with first fixing holes for fixing the functional panels and the reinforcement brackets, and the vertical row of side panels are provided with support fixing holes for fixing the bottom supports.

3. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: A first copper bar groove matching with the vertical row is provided on the back of the function board, and a first plug structure matching with the splicing module is provided on the board body between the first copper bar grooves, and the first plug structure contains a cylindrical boss and interlaced baffles located on both sides of the cylindrical boss, and a blind hole is provided on the surface of the cylindrical boss, and a metal inlaid nut is provided inside; an anti-mistaken touch baffle is provided on the front of the function board at the first copper bar groove; second fixing holes matching with the first fixing holes are provided on both sides of the function board; a first baffle is provided at the bottom of the function board, and a first groove matching with the first baffle is provided at the top.

4. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: A first socket structure is provided on the front side of the splicing module, and the first socket structure contains a cylindrical groove that cooperates with the cylindrical boss and a slot that nests with the interlaced baffle, and a through hole is provided on the bottom surface of the cylindrical groove; a second plug structure that is the same as the first plug structure is provided on the back side of the splicing module; evenly distributed protective baffle groups are provided on both sides of the splicing module, and each group of protective baffles is arranged in a left-right cross maze pattern; a second baffle is provided at the bottom of the splicing module, and a second groove that nests with the second baffle is provided on the top.

5. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: The front side of the vertical row cover plate is provided with a second socket structure identical to the first socket structure, a second copper row groove matching the thickness of the vertical row, and staggered through holes; the back side of the vertical row cover plate is provided with reinforcing ribs arranged in a cross shape; the bottom of the vertical row cover plate is provided with a third baffle, and the top is provided with a third groove nested with the third baffle.

6. The low-voltage drawer cabinet vertical channel structure according to claim 3, 4 or 5, characterized in that: The function board, the splicing module and the vertical row cover plate are fixed by fasteners. When fixed, the first copper bar groove on the function board and the second copper bar groove on the vertical row cover plate press the vertical copper bar, the first plug structure on the function board is plugged into the first socket structure on the splicing module, and the second plug structure on the splicing module is plugged into the second socket structure on the vertical row cover plate; the blind holes on the function board, the through holes on the splicing module and the through holes on the vertical row cover plate are combined to form a channel for accommodating the fasteners.

7. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: The bottom support has folded edges on both sides, and the folded edges are provided with third fixing holes that match the support fixing holes of the vertical row of side panels. The top of the bottom support is connected to the bottom sealing plate.

8. The low-voltage drawer cabinet vertical channel structure according to claim 1 is characterized in that: A baffle groove matched with each baffle is provided on the top of the bottom sealing plate, and a rectangular boss in contact with the bottom of the vertical copper bar is provided between the baffle grooves, the width of the rectangular boss is less than the thickness of the vertical copper bar, and the distance between the rectangular bosses is the same as the spacing between the copper bar grooves, and a fixing hole for connecting fasteners is provided at the baffle groove, and the fixing hole is a countersunk hole; an air inlet is provided on the front of the bottom sealing plate, and the left and right positions and depths of the air inlet are matched with the protective baffle of the splicing module, and a ventilation hole matched with the protective baffle is provided on the top of the air inlet, and the air inlet and the ventilation hole cooperate to form an "L"-shaped air inlet duct.

9. The low-voltage drawer cabinet vertical channel structure according to claim 1, characterized in that: The reinforcing support is composed of a vertical surface, the front and rear ends of the vertical surface have front and rear folded edges facing the vertical row of side plates and perpendicular to the vertical surface, and the lower end of the vertical surface has a lower folded edge away from the vertical row of side plates and perpendicular to the vertical surface.

10. The low-voltage drawer cabinet vertical channel structure according to claim 9, characterized in that: The reinforcing supports are fixed on the vertical row side panels in an alternating manner up and down, and the back of the vertical surface is in contact with the side surface of the vertical row cover plate to limit the left and right displacement of the vertical row cover plate; the rear folded edge is in contact with the inside of the vertical row side panel and cooperates with the vertical surface to limit the left and right displacement of the vertical row cover plate; the lower folded edge is in contact with the back of the vertical row cover plate to limit the front and rear displacement of the vertical row cover plate.

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