Full-automatic angle bead for LED display screen box

Abstract

A full-automatic angle bead for an LED display screen box is installed on a display screen box frame and comprises a compressed spring, a rack column, a gear screw, a sliding block, an angle bead piece and an angle bead installation base, the sliding block is provided with internal threads, the rack column is connected with the compressed spring, one end of the gear screw is rotationally connected with the angle bead installation base, and the gear end of the gear screw is meshed with the rack column. The middle threaded section of the gear screw is connected with internal threads of the sliding block through threads, the sliding block is connected with the corner protection piece through the first sliding piece, the corner protection piece is connected with the corner protection installation base through the second sliding piece, a kidney-shaped hole is formed in the side face of the corner protection piece, and a curved hole is formed in the side face of the corner protection installation base. When the sliding block slides, the first sliding piece drives the corner protection piece to slide, meanwhile, the second sliding piece synchronously drives the corner protection piece to obliquely slide along the curve track, the oblique sliding means that the corner protection piece is far away from or close to the corner protection installation base, and the full-automatic corner protection has the advantages of being capable of resetting automatically, saving manpower and being easy and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to display screen box technical field, concretely relates to a full -automatic corner protector of LED display screen box. BACKGROUND

[0002] The main role of the corner protector of the LED display screen box includes protecting the corners of the box, so as to improve the durability and safety of the display screen. The corner protector design can effectively protect the four corners and edges of the LED display screen box, prevent collision and damage during transportation or installation process, and is usually designed to be unfolded or retracted. When unfolded, the corner protector can cover the corners of the box to prevent collision. When retraction is needed, the corner protector can be retracted, which does not affect the splicing and installation between multiple boxes. The traditional LED display screen box corner protector structure needs to be manually unfolded or retracted, which is inconvenient to operate. When multiple display screen boxes need to be assembled and disassembled in batches, it is time-consuming and laborious, which affects the user experience. SUMMARY

[0003] Therefore, a full-automatic corner protector of LED display screen box is provided, which can automatically reset, save labor and is easy to operate.

[0004] A full-automatic corner protector of LED display screen box is installed on the frame of the display screen box, which comprises a compression spring, a rack column, a gear screw, a sliding block, a corner protector piece and a corner protector mounting seat. The sliding block has an internal thread. The rack column is connected with the compression spring. One end of the gear screw is rotatably connected with the corner protector mounting seat. The gear end of the gear screw is engaged with the rack column. The middle threaded segment of the gear screw is connected with the internal thread of the sliding block through a thread. The sliding block is connected with the corner protector piece through a first sliding member. The corner protector piece is connected with the corner protector mounting seat through a second sliding member. The side surface of the corner protector piece is provided with a waist-shaped hole. The side surface of the corner protector mounting seat is provided with a curved hole. The waist-shaped hole is parallel to the axial direction of the rack column. The first sliding member is installed in the waist-shaped hole. The second sliding member is installed in the curved hole. When the sliding block slides, the first sliding member drives the corner protector piece to slide, and at the same time, the second sliding member synchronously drives the corner protector piece to slide obliquely along the curved trajectory of the curved hole. The oblique sliding is that the corner protector piece moves away from or approaches the corner protector mounting seat, which correspondingly realizes the unfolding protection of the corner protector piece and the retraction of the corner protector piece.

[0005] Further, the curved hole comprises a slanting segment and a vertical segment, the slanting segment is distributed in a triangle shape with the compression spring and the gear screw, the vertical segment is parallel to the axial direction of the gear screw, the curved trajectory of the curved hole is the trajectory formed by the connection of the slanting segment and the vertical segment, the direction of the vertical segment is perpendicular to the direction of the waist-shaped hole, the direction of the slanting segment intersects with the direction of the waist-shaped hole, one end of the slanting segment connects with the vertical segment, the other end of the slanting segment extends in a slanting direction at a predetermined angle, the vertical segment is used to guide the movement of the corner guard sheet along the axial direction of the gear screw, and the slanting segment is used to guide the movement of the corner guard sheet along the axial direction of the rack column.

[0006] Further, the slanting segment is close to the compression spring, the vertical segment is close to the gear screw, two ends of the curved hole are respectively a starting end and an ending end, the starting end is located at the vertical segment and is away from one end of the compression spring, and the ending end is the other end. When the slider slides along the axial direction of the gear screw and towards the direction close to the ending end, the corner guard sheet slides along the trajectory direction from the starting end to the ending end. When the corner guard sheet is at the starting end, the corner guard sheet is in an unfolded protection state, and when the corner guard sheet is at the ending end, the corner guard sheet is in a retracted state.

[0007] Further, two curved holes are arranged on the side surface of the corner guard mounting seat and arranged along the axial direction of the gear screw, the corner guard sheet comprises a corner guard main plate and two corner guard side plates, one waist-shaped hole is arranged on each corner guard side plate, and the two waist-shaped holes are symmetrically distributed along the center line of the corner guard main plate and parallel to the rack column.

[0008] Further, the full-automatic corner guard of the LED display screen box further comprises a corner guard cover, the rack column comprises a pressing portion, the pressing portion is located at an end away from the compression spring, when the full-automatic corner guard of the LED display screen box is in the unfolded protection state of the corner guard sheet, the pressing portion and the corner guard main plate protrude from the side of the corner guard cover, the pressing portion is pressed, the corner guard main plate is flush with the corner guard cover when the pressing portion is completely retracted into the interior of the corner guard cover under the action of the compression spring, the corner guard main plate makes each outward surface of the corner guard cover flat, and the full-automatic corner guard of the LED display screen box is in the retracted state of the corner guard sheet.

[0009] Further, the rack column is perpendicular to the gear screw, when the pressing portion is pressed, the rack column drives the gear screw to rotate, the gear screw drives the slider to slide along the axial direction of the gear screw and towards the direction close to the rack column, and correspondingly, the full-automatic corner guard of the LED display screen box changes from the unfolded protection state of the corner guard sheet to the retracted state of the corner guard sheet.

[0010] Further, the first sliding member is a first sliding pin, and the second sliding member is a second sliding pin, and the first sliding pin is movable in the horizontal direction and the vertical direction by a distance greater than or equal to the distance by which the second sliding pin is movable in the horizontal direction and the vertical direction.

[0011] Further, the first sliding member is symmetrically distributed on both sides of the sliding block, and the second sliding member penetrates the corner sheet and the corner mounting seat, the corner sheet has an overall L-shaped structure, the corner side plate is an installation sheet extending from the inner side of the corner main plate, the two installation sheets are arranged along the inner side edges of the corner main plate, and the corner main plate is perpendicular to the corner side plate.

[0012] Further, the corner mounting seat has a groove in which the sliding block is slidably arranged, the sliding block has an installation hole in the middle, the gear screw is installed in the installation hole, the groove has a predetermined depth in the axial direction of the gear screw to provide a corresponding sliding stroke for the sliding block, and the sliding block is attached to at least two groove walls of the groove and slides along the groove walls.

[0013] Further, the full-automatic corner of the LED display screen box further comprises a spring baffle, the spring baffle is installed on the corner cover through fasteners, the corner cover is fixed with the corner mounting seat, the corner mounting seat is fixed with the display screen box frame, one end of the compression spring is connected to the spring baffle, the corner cover has a substantially U-shaped structure, the corner cover covers the corner mounting seat, and the two corner side plates are between the inner side of the corner cover and the outer side of the corner mounting seat.

[0014] Compared with the prior art, the LED display screen box full-automatic corner has at least the following beneficial effects:

[0015] The LED display screen box full-automatic corner is capable of sliding along the curved trajectory of the curved hole through the cooperation of the sliding block and the first sliding member, the cooperation of the first sliding member and the second sliding member and the corner sheet, and the cooperation of the compression spring, the rack column and the gear screw, the pressing part of the rack column can be automatically reset under the elastic action of the compression spring, the corner sheet can be automatically reset, and compared with the traditional manual corner, the full-automatic corner does not need manual intervention, is intelligent, easy to operate, time-saving and labor-saving. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of a full-automatic corner of an LED display screen box according to an embodiment of the present application.

[0017] Figure 2 is a perspective view of a full-automatic corner of an LED display screen box according to an embodiment of the present application.

[0018] Figure 3 is a disassembled schematic view of the full-automatic corner guard of the LED display screen box.

[0019] Figure 4 is a cross-sectional schematic view of the full-automatic corner guard of the LED display screen box in a corner guard protection state.

[0020] Figure 5 is a cross-sectional schematic view of the full-automatic corner guard of the LED display screen box in a corner guard retraction state.

[0021] In the figure,

[0022] 1, compression spring; 2, rack column; 3, gear screw; 4, bearing; 5, sliding block; 6, corner guard piece; 7, corner guard mounting seat; 8, first sliding member; 9, second sliding member; 10, waist-shaped hole; 11, curved hole; 12, oblique section; 13, vertical section; 14, starting end; 15, end; 16, corner guard cover; 17, pressing part; 18, groove; 19, mounting hole; 20, spring baffle. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0024] Please refer to Figures 1 to 5The utility model provides a kind of LED display screen box full-automatic corner protector provided by the embodiment of the utility model, it is installed on display screen box frame, including compression spring 1, rack column 2, gear screw 3, bearing 4, sliding block 5, corner piece 6 and corner mounting seat 7, the sliding block 5 has internal thread, the gear screw 3 includes rotating shaft end, middle threaded section and gear end, the rack column 2 is connected with the compression spring 1, rotating shaft end on the gear screw 3 is installed the bearing 4, the outer ring of bearing 4 is matched with the inner hole of corner mounting seat 7, the gear screw 3 is rotatably connected with corner mounting seat 7 by rotating shaft end and bearing 4, the gear end of gear screw 3 is engaged with the rack column 2, the middle threaded section is connected by thread with the internal thread of the sliding block 5, the sliding block 5 is connected with the corner piece 6 by first sliding part 8, the corner piece 6 is connected with the corner mounting seat 7 by second sliding part 9, the side of corner piece 6 is provided with waist type hole 10, the side of corner mounting seat 7 is provided with curved hole 11, the waist type hole 10 is parallel to the axial direction of the rack column 2, the curved hole 11 includes oblique section 12 and vertical section 13, the oblique section 12 and the compression spring 1, gear screw 3 are substantially triangular distribution, preferably right-angled triangle, for example, compression spring 1 (or rack column 2), gear screw 3 are two right-angle sides of right-angled triangle, and oblique section 12 is located on hypotenuse, the vertical section 13 is parallel to the axial direction of the gear screw 3, the first sliding part 8 is installed in the waist type hole 10, the second sliding part 9 is installed in the curved hole 11, when the sliding block 5 slides, the first sliding part 8 drives the corner piece 6 to slide, simultaneously, the second sliding part 9 synchronously drives the corner piece 6 to slide obliquely along the curved trajectory of the curved hole 11, the oblique sliding is that the corner piece 6 is away from or close to the corner mounting seat 7, correspondingly realizes that corner piece 6 unfolds protection and corner piece 6 is retracted.

[0025] Specifically, the curved trajectory of the curved hole 11 is the trajectory formed by the oblique section 12 and the vertical section 13, the direction of the vertical section 13 is out-of-plane perpendicular to the direction of the waist type hole 10, the direction of the oblique section 12 is out-of-plane intersected with the direction of the waist type hole 10, one end of the oblique section 12 links the vertical section 13, the other end of the oblique section 12 extends obliquely along a predetermined angle, the vertical section 13 is used to guide the corner piece 6 to move along the axial direction of the gear screw 3, and the oblique section 12 is used to guide the corner piece 6 to move along the axial direction of the rack column 2.

[0026] More specifically, the inclined section 12 is close to the compression spring 1, the vertical section 13 is close to the gear screw 3, the hole of the curved hole 11 has a starting end 14 and a terminal end 15 respectively, the starting end 14 is located at the vertical section 13 and is away from one end of the compression spring 1, the terminal end 15 is the other end, when the slider 5 slides along the axial direction of the gear screw 3 and towards the terminal end 15, the corner guard sheet 6 slides along the trajectory direction from the starting end 14 to the terminal end 15, when the corner guard sheet 6 is at the starting end, the corner guard sheet 6 is in the unfolded protection state, when the corner guard sheet 6 is at the terminal end, the corner guard sheet 6 is in the state of being retracted to the inside of the box.

[0027] Specifically, the side of the corner guard mounting seat 7 is provided with two curved holes 11, and the two curved holes 11 are arranged along the axial direction of the gear screw 3. The corner guard sheet 6 includes a corner guard main plate and two corner guard side plates, and each corner guard side plate is provided with a waist-shaped hole 10. The two waist-shaped holes 10 are symmetrically distributed along the center line of the corner guard main plate and are parallel to the rack column 2.

[0028] More specifically, the full-automatic corner guard of the LED display screen box further includes a corner guard cover 16, the rack column 2 includes a pressing part 17, the pressing part 17 is located away from one end of the compression spring 1, when the full-automatic corner guard of the LED display screen box is in the unfolded protection state of the corner guard sheet 6, the pressing part 17 and the corner guard main plate protrude from the side of the corner guard cover 16, and the pressing part 17 is pressed. When the pressing part 17 is completely retracted to the inside of the corner guard cover 16 under the action of the compression spring 1, the corner guard main plate is flush with the corner guard cover 16, the corner guard main plate makes each outward surface of the corner guard cover 16 flat, and the full-automatic corner guard of the LED display screen box is in the retracted state of the corner guard sheet 6.

[0029] More specifically, the rack column 2 is perpendicular to the gear screw 3, when the pressing part 17 is pressed, the rack column 2 drives the gear screw 3 to rotate, the gear screw 3 drives the slider 5 to slide along the axial direction of the gear screw 3 and towards the rack column 2, correspondingly, the full-automatic corner guard of the LED display screen box changes from the unfolded protection state of the corner guard sheet 6 to the retracted state of the corner guard sheet 6.

[0030] In some specific embodiments, the corner protector 6 is initially in an unfolded protection state. When the pressing portion 17 of the rack column 2 is pressed, the rack column 2 moves inwardly to the corner cover 16, driving the gear screw 3 to rotate. The sliding block 5 is internally provided with threads that are matched with the gear screw 3. Under the action of the bearing 4 and the threaded connection, the gear screw 3 rotates to drive the sliding block 5 to slide along the axial direction of the gear screw 3 and towards the rack column 2. The sliding block 5 and the first sliding member 8 drive the corner protector 6 to slide towards the rack column 2. Meanwhile, the corner protector 6 is limited by the second sliding member 9, which synchronously drives the corner protector 6 to slide along the curved trajectory of the curved hole 11 and towards the rack column 2. Finally, the corner protector 6 is obliquely slid along the curved trajectory of the curved hole 11 and towards the rack column 2 to a retracted state. More specifically, when the LED display screens are spliced, the pressing portions 17 of the adjacent boxes are stressed against each other, so that the corner protectors 6 between the boxes are simultaneously retracted inwardly and hidden inside the boxes, so that the boxes are not affected by the corner protectors.

[0031] In some specific embodiments, when the pressing portion 17 is not pressed, the rack column 2 is automatically reset under the elastic action of the compression spring 1. The rack column 2 moves outwardly from the corner cover 16, driving the gear screw 3 to rotate reversely. The gear screw 3 reversely rotates to drive the sliding block 5 to slide along the axial direction of the gear screw 3 and away from the rack column 2. The sliding block 5 and the first sliding member 8 drive the corner protector 6 to slide away from the rack column 2. Meanwhile, the corner protector 6 is limited by the second sliding member 9, which synchronously drives the corner protector 6 to slide along the curved trajectory of the curved hole 11 and away from the rack column 2. Finally, the corner protector 6 is obliquely slid along the curved trajectory of the curved hole 11 to the unfolded protection state. More specifically, during the transportation of the LED display screens, the pressing portion 17 is not subjected to the pressing force. The elastic thrust of the compression spring 1 on the rack column 2 automatically resets the rack column 2. The corner protector 6 is in the unfolded protection state and is higher than the surface of the box module, so that, when the box is bumped during the transportation, the corner protector 6 is bumped instead of the LED lamp beads inside the box, thereby playing a certain protection role.

[0032] Specifically, the first sliding member 8 is a first sliding pin, and the second sliding member 9 is a second sliding pin. The movable distance of the first sliding pin in the horizontal and vertical directions is greater than or equal to the movable distance of the second sliding pin in the horizontal and vertical directions, respectively.

[0033] More specifically, the first sliding member 8 is symmetrically distributed on both sides of the sliding block 5, the second sliding member 9 penetrates the corner sheet 6 and the corner mounting base 7, the corner sheet 6 is in an overall L-shaped structure, the corner side plate is an installation sheet extended from the inner side of the corner main plate, and two installation sheets are arranged along the inner side edges of the corner main plate, and the corner main plate is perpendicular to the corner side plate.

[0034] Specifically, the corner mounting base 7 is provided with a groove 18 in which the sliding block 5 slides, the sliding block 5 is provided with an installation hole 19 in the middle, the gear screw 3 is installed in the installation hole 19, the groove 18 has a predetermined depth in the axial direction of the gear screw 3 to provide a corresponding sliding stroke for the sliding block 5, and the sliding block 5 is attached to and slides along at least two groove walls of the groove 18.

[0035] More specifically, the full-automatic corner of the LED display screen box further comprises a spring baffle 20, the spring baffle 20 is installed on the corner cover 16 through fasteners, the corner cover 16 is fixed with the corner mounting base 7, the corner mounting base 7 is fixed with the display screen box frame, one end of the compression spring 1 is connected to the spring baffle 20, the corner cover 16 is in a substantially U-shaped structure, the corner cover 16 covers the corner mounting base 7, and two corner side plates are between the inner side of the corner cover 16 and the outer side of the corner mounting base 7.

[0036] In summary, the full-automatic corner of the LED display screen box can make the corner sheet 6 slide obliquely along the curved trajectory direction of the curved hole 11 through the cooperation of the sliding block 5 and the first sliding member 8, the cooperation of the first sliding member 8 and the second sliding member 9 and the corner sheet 6, so that the corner sheet 6 can be unfolded outwardly or retracted inwardly, and the cooperation of the compression spring 1, the rack column 2 and the gear screw 3 is adopted, the pressing part 17 of the rack column 2 can be automatically reset under the elastic action of the compression spring 1, and the corner sheet 6 can be automatically reset, compared with the traditional manual corner, the full-automatic corner does not need manual intervention in the whole process, is intelligent, easy to operate and saves time and effort.

[0037] It should be noted that the utility model is not limited to the above-mentioned embodiments, and other changes can be made by those skilled in the art according to the creative spirit of the utility model, and the changes made according to the creative spirit of the utility model should be included in the scope of protection claimed by the utility model.

Claims

1. A full-automatic corner guard for LED display screen boxes, installed on a display screen box frame, characterized in that, The application relates to a protective corner device, which comprises a compression spring, a rack column, a gear screw, a sliding block, a protective corner sheet and a protective corner mounting seat, wherein the sliding block is internally threaded, the rack column is connected with the compression spring, one end of the gear screw is rotationally connected with the protective corner mounting seat, the gear end of the gear screw is engaged with the rack column, the middle threaded segment of the gear screw is threadedly connected with the internal thread of the sliding block, the sliding block is connected with the protective corner sheet through a first sliding element, the protective corner sheet is connected with the protective corner mounting seat through a second sliding element, the side surface of the protective corner sheet is provided with a waist-shaped hole, the side surface of the protective corner mounting seat is provided with a curved hole, the waist-shaped hole is parallel to the axial direction of the rack column, the first sliding element is arranged in the waist-shaped hole, the second sliding element is arranged in the curved hole, when the sliding block slides, the first sliding element drives the protective corner sheet to slide, meanwhile, the second sliding element synchronously drives the protective corner sheet to obliquely slide along the curved trajectory of the curved hole, the oblique sliding is that the protective corner sheet moves away from or approaches the protective corner mounting seat, and the protective corner sheet unfolding protection and the protective corner sheet retracting are correspondingly realized.

2. The full-automatic corner guard of an LED display screen box according to claim 1, characterized in that, The curved hole comprises an oblique segment and a vertical segment, the oblique segment is distributed in a triangle shape with the compression spring and the gear screw, the vertical segment is parallel to the axial direction of the gear screw, the curved trajectory of the curved hole is a trajectory formed by the connection of the oblique segment and the vertical segment, the trend of the vertical segment is different from the trend of the waist-shaped hole and is perpendicular to the waist-shaped hole, the trend of the oblique segment is different from the trend of the waist-shaped hole and intersects with the waist-shaped hole, one end of the oblique segment connects the vertical segment, the other end of the oblique segment extends obliquely along a predetermined angle, the vertical segment is used for guiding the movement of the protective corner sheet along the axial direction of the gear screw, and the oblique segment is used for guiding the movement of the protective corner sheet along the axial direction of the rack column.

3. The full-automatic corner guard of an LED display screen box according to claim 2, characterized in that, The oblique segment is close to the compression spring, the vertical segment is close to the gear screw, the two ends of the curved hole are respectively a starting end and an ending end, the starting end is located at the vertical segment and is away from one end of the compression spring, and the ending end is the other end, when the sliding block slides along the axial direction of the gear screw and approaches the ending end, the protective corner sheet slides along the trajectory direction from the starting end to the ending end, the protective corner sheet is in an unfolding protection state when the protective corner sheet is at the starting end, and the protective corner sheet is in a retracting state when the protective corner sheet is at the ending end.

4. The full-automatic corner guard of an LED display screen box according to claim 1, characterized in that, The side surface of the protective corner mounting seat is provided with two curved holes, the two curved holes are arranged along the axial direction of the gear screw, the protective corner sheet comprises a protective corner main plate and two protective corner side plates, one waist-shaped hole is arranged on each protective corner side plate, and the two waist-shaped holes are symmetrically distributed along the center line of the protective corner main plate and are parallel to the rack column.

5. The full-automatic corner guard of an LED display screen box according to claim 4, characterized in that, The LED display screen box full-automatic corner protector further comprises a corner cover, the rack column comprises a pressing part, the pressing part is located at one end away from the compression spring, when the LED display screen box full-automatic corner protector is in the corner sheet unfolded protection state, the pressing part and the corner main plate protrude from the side of the corner cover, the pressing part is pressed, under the action of the compression spring, the pressing part is completely withdrawn to the inside of the corner cover, the corner main plate is flush with the corner cover, the corner main plate makes each outward surface of the corner cover flat, and the LED display screen box full-automatic corner protector is in the corner sheet retracted state.

6. The full-automatic corner guard of an LED display screen box according to claim 5, characterized in that, The rack column and the gear screw are vertically placed, when the pressing part is pressed, the rack column drives the gear screw to rotate, the gear screw drives the sliding block to slide along the axial direction of the gear screw and towards the direction close to the rack column, correspondingly, the LED display screen box full-automatic corner protector changes from the corner sheet unfolded protection state to the corner sheet retracted state.

7. The full-automatic corner guard of an LED display screen box according to claim 1, characterized in that, The first sliding part is a first sliding pin, the second sliding part is a second sliding pin, and the movable distance of the first sliding pin in the horizontal direction and the vertical direction is greater than or equal to the movable distance of the second sliding pin in the horizontal direction and the vertical direction respectively.

8. The full-automatic corner guard of an LED display screen box according to claim 4, characterized in that, The first sliding part is symmetrically distributed on both sides of the sliding block, the second sliding part penetrates the corner sheet and the corner mounting seat, the corner sheet has an overall L-shaped structure, the corner side plate is an installation sheet extending from the inner side of the corner main plate, the two installation sheets are arranged along the inner side edges of the corner main plate, and the corner main plate is perpendicular to the corner side plate.

9. The full-automatic corner guard of an LED display screen box according to claim 1, characterized in that, The corner mounting seat has a groove, the sliding block slides in the groove, the sliding block has an installation hole in the middle, the gear screw is installed in the installation hole, the groove has a predetermined depth in the axial direction of the gear screw to provide a corresponding sliding stroke for the sliding block, and the sliding block is attached to at least two groove walls of the groove and slides along the groove walls.

10. The full-automatic corner guard of an LED display screen box according to claim 5, characterized in that, The LED display screen box full-automatic corner protector further comprises a spring baffle, the spring baffle is installed on the corner cover through fasteners, the corner cover is fixed with the corner mounting seat, the corner mounting seat is fixed with the display screen box frame, one end of the compression spring is connected to the spring baffle, the corner cover has an overall U-shaped structure, the corner cover covers the corner mounting seat, and the two corner side plates are between the inner side of the corner cover and the outer side of the corner mounting seat.

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