A counterweight maintenance platform

Abstract

This utility model discloses a counterweight maintenance platform, including two longitudinal walkways and a transverse walkway. The two ends of the two longitudinal walkways are respectively placed on two concrete locking beams. Each longitudinal walkway includes a first platform, several second platforms, and a third platform that are detachably connected longitudinally. The two ends of the transverse walkway are respectively engaged and longitudinally limited on the two longitudinal walkways. The transverse walkway includes several second platforms that are detachably connected transversely. In this utility model, the entire counterweight maintenance platform can be quickly and freely assembled from the first platform, second platform, third platform, and railings. The lengths of both the longitudinal and transverse walkways can be adjusted by changing the number of second platforms used. Therefore, this counterweight maintenance platform is freely combinable, length-adjustable, and highly versatile, adaptable to counterweight maintenance in different situations and for different maintenance tasks.

Description

Technical Field

[0001] This utility model belongs to the field of ship lift technology, and in particular relates to a counterweight maintenance platform. Background Technology

[0002] As a core component of the ship lift, the counterweight system significantly reduces drive energy consumption and improves operational stability through its ingenious gravity balance design. Furthermore, due to the harsh operating conditions and critical importance of the counterweight system to the normal operation of the ship lift, its maintenance is also crucial.

[0003] Currently, maintenance platforms are often fixed to mechanical equipment to facilitate maintenance. However, counterweight systems have complex structures and a large number of counterweights, making traditional fixed maintenance platforms unsuitable for counterweight maintenance due to the difficulty in disassembling and reassembling them. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a counterweight maintenance platform that is applicable to the maintenance of counterweights.

[0005] The objective of this utility model is achieved through the following technical solution: A counterweight maintenance platform, comprising: Two longitudinal walkways, with each end of the two longitudinal walkways being placed on two concrete locking beams. The longitudinal walkways include a first platform, several second platforms, and a third platform that are detachably connected in sequence along the longitudinal direction. The transverse walkway has its two ends respectively engaged and longitudinally limited to two longitudinal walkways. The transverse walkway includes several second platforms that can be detachably connected in sequence along the transverse direction. The sides of the first, second, and third platforms are all detachably connected with railings; The first platform includes a first square frame, and two first connecting ears are respectively provided on both sides of one end of the first square frame; The second platform includes a second square frame, with two second connecting ears on each side of one end of the second square frame and two third connecting ears on each side of the other end of the second square frame. The third platform includes a third-dimensional frame, with two fourth connecting ears on each side of one end of the third-dimensional frame; Among them, the two first connecting ears are used to detachably connect the two second connecting ears respectively, the two fourth connecting ears are used to detachably connect the two third connecting ears respectively, and the two second connecting ears of the second square frame are used to detachably connect the two third connecting ears of the adjacent second square frame respectively.

[0006] Furthermore, the first square frame includes a first square frame and a first grid disposed within the first square frame; the second square frame includes a second square frame and a second grid disposed within the second square frame; and the third square frame includes a third square frame and a third grid disposed within the third square frame. The second and third connecting ears at both ends of the transverse walkway are used to engage and be longitudinally limited within the two first grids, the two second grids, or the two third grids, respectively.

[0007] Furthermore, within the first grid, several grid plates are uniformly arranged along the length direction of the first grid, and each grid plate extends along the width direction of the first grid; within the second grid, several grid plates are uniformly arranged along the length direction of the second grid, and each grid plate extends along the width direction of the second grid; within the second grid, several grid plates are uniformly arranged along the length direction of the second grid, and each grid plate extends along the width direction of the second grid. The lower part of the second connecting ear at one end of the transverse walkway is used to be inserted vertically between two adjacent grid plates on a longitudinal walkway, and the lower part of the third connecting ear at the other end of the transverse walkway is used to be inserted vertically between two adjacent grid plates on another longitudinal walkway.

[0008] Furthermore, the lower ends of both the second and third connecting ears are lower than the lower end of the second square frame.

[0009] Furthermore, the first square frame includes two first longitudinal channel steels and two first transverse channel steels. The two ends of one first transverse channel steel are respectively fixedly connected to one end of the two first longitudinal channel steels, and the two ends of the other first transverse channel steel are respectively fixedly connected to the other end of the two first longitudinal channel steels. The second square frame includes two second longitudinal channel steels and two second transverse channel steels. The two ends of one second transverse channel steel are respectively fixedly connected to one end of the two second longitudinal channel steels, and the two ends of the other second transverse channel steel are respectively fixedly connected to the other end of the two second longitudinal channel steels. The third square frame includes two third longitudinal channel steels and two third transverse channel steels. The two ends of one third transverse channel steel are respectively fixedly connected to one end of the two third longitudinal channel steels, and the two ends of the other third transverse channel steel are respectively fixedly connected to the other end of the two third longitudinal channel steels.

[0010] Furthermore, several first mounting plates are evenly arranged along the length direction on the outer side of the first longitudinal channel steel, and a first plug for vertically inserting the railing is fixedly connected to all the first mounting plates; several second mounting plates are evenly arranged along the length direction on both sides of the second longitudinal channel steel, and a second plug for vertically inserting the railing is fixedly connected to all the second mounting plates; several third mounting plates are evenly arranged along the length direction on both sides of the third longitudinal channel steel, and a third plug for vertically inserting the railing is fixedly connected to all the third mounting plates.

[0011] Furthermore, the railing includes two first vertical inserts and one first horizontal bar. The upper ends of the two first vertical inserts are integrally fixedly connected to the two ends of the first horizontal bar, and several second horizontal bars are fixedly connected between the two first vertical inserts. The railing also includes several second vertical rods fixedly connected to several second horizontal bars, with the upper end of the second vertical rods fixedly connected to the first horizontal bar.

[0012] Furthermore, kick plates are fixedly connected to the lower parts of the two first vertical rods and several second vertical rods.

[0013] Furthermore, the lower four corners of the first platform are equipped with casters with brakes, and the lower end of the third platform is equipped with a support block. The support block and the fourth connecting lug are located at the two ends of the third platform, and the height of the support block matches the height of the caster. Furthermore, the first square frame is fixedly connected to a first filler plate at the same end as the first connecting ear, the second square frame is fixedly connected to both ends of a second filler plate, and the third square frame is fixedly connected to a third filler plate at the same end as the fourth connecting ear.

[0014] The beneficial effects of this utility model are as follows: The entire counterweight maintenance platform can be quickly and freely assembled from the first platform, the second platform, the third platform, and the railings, depending on the structure of the counterweight system and the specific conditions of the counterweights, so as to be suitable for counterweight maintenance. Attached Figure Description

[0015] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings. Wherein: Figure 1 An installation diagram of this utility model is shown; Figure 2 This shows a schematic diagram of the structure of the first platform in this utility model; Figure 3 This shows a schematic diagram of the structure of the second platform in this utility model; Figure 4 This shows a schematic diagram of the structure of the third platform in this utility model; Figure 5 This invention displays a schematic diagram of the railing structure. Figure 6 A schematic diagram of the structure of this utility model is shown; Figure 7 Showing Figure 6 A magnified view of a section at point A in the middle; In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0016] Figure label: 1. Concrete locking beam; 2. Counterweight locking layer; 3. Transverse walkway; 4. Longitudinal walkway; 5. Casters; 6. First platform; 601. First longitudinal channel steel; 602. First transverse channel steel; 603. First grid; 604. First connecting lug; 605. First mounting plate; 606. First insert; 607. First gap-filling plate; 7. Second platform; 701. Second longitudinal channel steel; 702. Second transverse channel steel; 703. Second grid; 704. Second gap-filling plate; 705. Second... 706. Connecting ear; 707. Second mounting plate; 708. Second insert; 709. Third connecting ear; 800. Third platform; 801. Third longitudinal channel steel; 802. Third transverse channel steel; 803. Third grid; 804. Fourth connecting ear; 805. Third mounting plate; 806. Third insert; 807. Support; 808. Third filler plate; 9. Railing; 901. First vertical insert; 902. First horizontal bar; 903. Second horizontal bar; 904. Second vertical insert; 905. Kickboard. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] This utility model provides a counterweight maintenance platform, such as Figure 1-7 As shown, it includes: Two longitudinal walkways 4, with their ends respectively used to place two concrete locking beams 1. The longitudinal walkways 4 include a first platform 6, several second platforms 7 and a third platform 8 bolted together in sequence along the longitudinal direction. The transverse walkway 3 has its two ends respectively engaged and longitudinally limited on two longitudinal walkways 4. The transverse walkway 3 includes several second platforms 7 that are detachably connected in sequence along the transverse direction. The sides of the first platform 6, the second platform 7, and the third platform 8 are all fitted with railings 9; The first platform 6 includes a first square frame, and two first connecting ears 604 are symmetrically arranged on both sides of one end of the first square frame; The second platform 7 includes a second square frame, with two second connecting ears 705 symmetrically arranged on both sides of one end of the second square frame, and two third connecting ears 708 symmetrically arranged on both sides of the other end of the second square frame. The third platform 8 includes a third-dimensional frame, and two fourth connecting ears 804 are symmetrically arranged on both sides of one end of the third-dimensional frame; Among them, the two first connecting ears 604 are used to bolt the two second connecting ears 705 respectively, the two fourth connecting ears 804 are used to bolt the two third connecting ears 708 respectively, and the two second connecting ears 705 of the second square frame are used to bolt the two third connecting ears 708 of the adjacent second square frame respectively.

[0019] It is understandable that the entire counterweight maintenance platform can be quickly and freely assembled from the first platform 6, the second platform 7, the third platform 8 and the railing 9. The lengths of the longitudinal walkway 4 and the transverse walkway 3 can be adjusted by changing the number of second platforms 7 used. In other words, the counterweight maintenance platform can be freely assembled, has an adjustable length and strong versatility, and can adapt to counterweight maintenance in different occasions and for different maintenance tasks.

[0020] It should be noted that the lateral distances between the outer sides of the two first connecting ears 604, the lateral distances between the inner sides of the two second connecting ears 705, the lateral distances between the outer sides of the two third connecting ears 708, and the lateral distances between the inner sides of the two fourth connecting ears 804 are all matched; or, the lateral distances between the inner sides of the two first connecting ears 604, the lateral distances between the outer sides of the two second connecting ears 705, the lateral distances between the inner sides of the two third connecting ears 708, and the lateral distances between the outer sides of the two fourth connecting ears 804 are all matched. This arrangement allows the first connecting ears 604 to fit snugly against each other when bolted to the second connecting ears 705, allows the fourth connecting ears 804 to fit snugly against each other when bolted to the third connecting ears 708, and allows the second connecting ears 705 on the second square frame to fit snugly against each other when bolted to the third connecting ears 708 on an adjacent second square frame. This makes it easier to accurately locate the connection position and achieve a stable connection when these bolted connection structures are connected.

[0021] It should be noted that the two concrete locking beams 1 are the original structure inside the counterweight well and are located on one side of the counterweight locking layer 2; in addition, at least two bolt connections are provided between the two connecting ears to make the connection between the two platforms more stable.

[0022] In one embodiment, the first square frame includes a first square frame and a first grid 603 disposed within the first square frame, the second square frame includes a second square frame and a second grid 703 disposed within the second square frame, and the third square frame includes a third square frame and a third grid 803 disposed within the third square frame. The second connecting ears 705 and the third connecting ears 708 at both ends of the transverse walkway 3 are used to snap into and be longitudinally limited within the two first grids 603, the two second grids 703, or the two third grids 803, respectively.

[0023] In one embodiment, a plurality of grid plates within a first grid 603 are uniformly arranged along the length direction of the first grid 603, and the plurality of grid plates within the first grid 603 extend along the width direction of the first grid 603; a plurality of grid plates within a second grid 703 are uniformly arranged along the length direction of the second grid 703, and the plurality of grid plates within the second grid 703 extend along the width direction of the second grid 703; a plurality of grid plates within a second grid 703 are uniformly arranged along the length direction of the second grid 703, and the plurality of grid plates within the second grid 703 extend along the width direction of the second grid 703. The lower part of the second connecting ear 705 at one end of the transverse walkway 3 is used to be inserted vertically between two adjacent grid plates on a longitudinal walkway 4, and the lower part of the third connecting ear 708 at the other end of the transverse walkway 3 is used to be inserted vertically between two adjacent grid plates on another longitudinal walkway 4.

[0024] It is understandable that when the lower part of the second connecting ear 705 at one end of the transverse walkway 3 is used to be vertically engaged between two adjacent grid plates on a longitudinal walkway 4, the two adjacent grid plates on the longitudinal walkway 4 can restrict the longitudinal movement of the second connecting ear 705, thereby restricting the longitudinal movement of one end of the transverse walkway 3; when the lower part of the third connecting ear 708 at the other end of the transverse walkway 3 is used to be vertically engaged between two adjacent grid plates on another longitudinal walkway 4, the two adjacent grid plates on the other longitudinal walkway 4 can restrict the longitudinal movement of the third connecting ear 708, thereby restricting the longitudinal movement of the other end of the transverse walkway 3; therefore, this arrangement can restrict the longitudinal movement of the transverse walkway 3.

[0025] In one embodiment, the lower ends of the second connecting ear 705 and the third connecting ear 708 are both lower than the lower end of the second square frame, that is, the lower parts of the second connecting ear 705 and the third connecting ear 708 can protrude and be inserted between two adjacent grid plates.

[0026] In one embodiment, the first square frame includes two first longitudinal channel steels 601 and two first transverse channel steels 602. The two ends of one first transverse channel steel 602 are respectively fixedly connected to one end of the two first longitudinal channel steels 601, and the two ends of the other first transverse channel steel 602 are respectively fixedly connected to the other end of the two first longitudinal channel steels 601. The second square frame includes two second longitudinal channel steels 701 and two second transverse channel steels 702. The two ends of one second transverse channel steel 702 are respectively fixedly connected to one end of the two second longitudinal channel steels 701, and the two ends of the other second transverse channel steel 702 are respectively fixedly connected to the other end of the two second longitudinal channel steels 701. The third square frame includes two third longitudinal channel steels 801 and two third transverse channel steels 802. The two ends of one third transverse channel steel 802 are respectively fixedly connected to one end of the two third longitudinal channel steels 801, and the two ends of the other third transverse channel steel 802 are respectively fixedly connected to the other end of the two third longitudinal channel steels 801.

[0027] It should be noted that the openings of the first longitudinal channel steel 601, the first transverse channel steel 602, the second longitudinal channel steel 701, the second transverse channel steel 702, the third longitudinal channel steel 801, and the third transverse channel steel 802 are all arranged facing outwards.

[0028] In one embodiment, three first mounting plates 605 are evenly arranged along the length direction on the outer side of the first longitudinal channel steel 601, and a first plug-in 606 for vertically inserting the railing 9 is fixedly connected to each first mounting plate 605; three second mounting plates 706 are evenly arranged along the length direction on both sides of the second longitudinal channel steel 701, and a second plug-in 707 for vertically inserting the railing 9 is fixedly connected to each second mounting plate 706; three third mounting plates 805 are evenly arranged along the length direction on both sides of the third longitudinal channel steel 801, and a third plug-in 806 for vertically inserting the railing 9 is fixedly connected to each third mounting plate 805.

[0029] In one embodiment, the railing 9 includes two first vertical rods 901 and a first horizontal rod 902. The upper ends of the two first vertical rods 901 are integrally fixedly connected to the two ends of the first horizontal rod 902, and two second horizontal rods 903 are welded between the two first vertical rods 901. The railing 9 also includes a second vertical rod 904 welded to the two second horizontal bars 903, with the first horizontal bar 902 welded to the upper end of the second vertical rod 904.

[0030] It should be noted that the railing 9 can be inserted into the three first inserts 606 outside the first longitudinal channel steel 601 by inserting two first vertical inserts 901 and two vertical inserts 904 into the three second inserts 707 outside the second longitudinal channel steel 701; the railing 9 can be inserted into the three third inserts 806 outside the third longitudinal channel steel 801 by inserting two first vertical inserts 901 and two vertical inserts 904 into the three third inserts 806 outside the third longitudinal channel steel 801. In addition, by setting up railing 9, it can be ensured that personnel can safely enter and exit the maintenance platform and smoothly and safely reach the counterweight waiting to be maintained.

[0031] It should also be noted that the two first vertical inserts 901 and the first horizontal insert 902 can be made from the same round tube.

[0032] In one embodiment, a kick plate 905 is fixedly connected to the lower part of the two first vertical rods 901 and the second vertical rod 904.

[0033] In one embodiment, casters 5 with brakes are provided at the four corners of the lower end of the first platform 6 to facilitate the quick assembly of the maintenance platform and the quick maintenance of the counterweight; a support 807 is provided at the lower end of the third platform 8, and the support 807 and the fourth connecting lug 804 are located at the two ends of the third platform 8 respectively. The height of the support 807 matches the height of the casters 5 to ensure that the height of the two ends of the longitudinal walkway 4 is consistent.

[0034] In one embodiment, a first square frame is welded with a first filler plate 607 at the same end as the first connecting ear 604, a second square frame is welded with a second filler plate 704 at both ends, and a third square frame is welded with a third filler plate 808 at the same end as the fourth connecting ear 804.

[0035] Understandably, the first gap-filling plate 607, the second gap-filling plate 704, and the third gap-filling plate 808 can fill the gaps between the platforms to further improve safety performance.

[0036] The maintenance process for the counterweight is as follows: The counterweight block is first raised to the top of the counterweight locking layer 2 to free up the counterweight well. Two longitudinal walkways 4 and one transverse walkway 3 are assembled in the counterweight locking layer 2; The two longitudinal walkways 4 are longitudinally erected between the two concrete locking beams 1 at the edge of the counterweight well cavity, and then the brake device on the caster 5 is stepped on. The two ends of the transverse walkway 3 are placed on the two longitudinal walkways 4, and the lower parts of the second connecting ears 705 and the third connecting ears 708 at both ends of the transverse walkway 3 are respectively inserted between two adjacent grid plates on the two longitudinal walkways 4 to restrict the longitudinal sliding of the transverse walkway 3. The counterweight is raised and lowered, allowing maintenance personnel to enter the maintenance platform and reach the counterweight's position to carry out maintenance work.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", 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, they should not be construed as limitations on this utility model.

[0038] While specific embodiments of the present invention have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A counterweight maintenance platform, characterized in that, include: Two longitudinal walkways (4), the two ends of the two longitudinal walkways (4) are respectively used to place two concrete locking beams (1), the longitudinal walkways (4) include a first platform (6), several second platforms (7) and a third platform (8) that are detachably connected in the longitudinal direction. The transverse walkway (3) has its two ends respectively engaged and longitudinally limited on the two longitudinal walkways (4). The transverse walkway (3) includes a number of second platforms (7) that are detachably connected in the transverse direction. The first platform (6), the second platform (7) and the third platform (8) are all detachably connected to railings (9); The first platform (6) includes a first square frame, and two first connecting ears (604) are respectively provided on both sides of one end of the first square frame. The second platform (7) includes a second square frame, with two second connecting ears (705) respectively provided on both sides of one end of the second square frame, and two third connecting ears (708) respectively provided on both sides of the other end of the second square frame. The third platform (8) includes a third-dimensional frame, and two fourth connecting ears (804) are respectively provided on both sides of one end of the third-dimensional frame. Among them, the two first connecting ears (604) are used to detachably connect the two second connecting ears (705) respectively, the two fourth connecting ears (804) are used to detachably connect the two third connecting ears (708) respectively, and the two second connecting ears (705) of the second square frame are used to detachably connect the two third connecting ears (708) of the adjacent second square frame respectively.

2. The counterweight maintenance platform according to claim 1, characterized in that, The first square frame includes a first square frame and a first grid (603) disposed within the first square frame; the second square frame includes a second square frame and a second grid (703) disposed within the second square frame; and the third square frame includes a third square frame and a third grid (803) disposed within the third square frame. The second connecting ears (705) and the third connecting ears (708) at both ends of the transverse walkway (3) are used to engage and be longitudinally limited within the two first grids (603), the two second grids (703), or the two third grids (803), respectively.

3. The counterweight maintenance platform according to claim 2, characterized in that, Within the first grid (603), several grid plates are evenly arranged along the length direction of the first grid (603), and the grid plates within the first grid (603) all extend along the width direction of the first grid (603); within the second grid (703), several grid plates are evenly arranged along the length direction of the second grid (703), and the grid plates within the second grid (703) all extend along the width direction of the second grid (703); The lower part of the second connecting ear (705) at one end of the transverse walkway (3) is used to be inserted vertically between two adjacent grid plates on one of the longitudinal walkways (4), and the lower part of the third connecting ear (708) at the other end of the transverse walkway (3) is used to be inserted vertically between two adjacent grid plates on another of the longitudinal walkways (4).

4. The counterweight maintenance platform according to claim 3, characterized in that, The lower ends of the second connecting ear (705) and the third connecting ear (708) are both lower than the lower end of the second square frame.

5. A counterweight maintenance platform according to claim 2, characterized in that, The first square frame includes two first longitudinal channel steels (601) and two first transverse channel steels (602). One end of one first transverse channel steel (602) is fixedly connected to one end of the two first longitudinal channel steels (601), and the other end of the other first transverse channel steel (602) is fixedly connected to the other end of the two first longitudinal channel steels (601). The second square frame includes two second longitudinal channel steels (701) and two second transverse channel steels (702). One end of the second transverse channel steel (702) is fixedly connected to one end of the two second longitudinal channel steels (701), and the other end of the second transverse channel steel (702) is fixedly connected to the other end of the two second longitudinal channel steels (701). The third-dimensional frame includes two third longitudinal channel steels (801) and two third transverse channel steels (802). The two ends of one third transverse channel steel (802) are respectively fixedly connected to one end of the two third longitudinal channel steels (801), and the two ends of the other third transverse channel steel (802) are respectively fixedly connected to the other end of the two third longitudinal channel steels (801).

6. A counterweight maintenance platform according to claim 5, characterized in that, The outer sides of the first longitudinal channel steel (601) are uniformly provided with a plurality of first mounting plates (605) along the length direction, and a first plug-in (606) for vertically inserting the railing (9) is fixedly connected to all the first mounting plates (605); the two sides of the second longitudinal channel steel (701) are uniformly provided with a plurality of second mounting plates (706) along the length direction, and a second plug-in (707) for vertically inserting the railing (9) is fixedly connected to all the second mounting plates (706); the two sides of the third longitudinal channel steel (801) are uniformly provided with a plurality of third mounting plates (805) along the length direction, and a third plug-in (806) for vertically inserting the railing (9) is fixedly connected to all the third mounting plates (805).

7. A counterweight maintenance platform according to claim 1 or 6, characterized in that, The railing (9) includes two first vertical rods (901) and a first horizontal rod (902). The upper ends of the two first vertical rods (901) are integrally fixedly connected to the two ends of the first horizontal rod (902). A plurality of second horizontal rods (903) are fixedly connected between the two first vertical rods (901). The railing (9) also includes a plurality of second vertical rods (904) fixedly connected to a plurality of second horizontal rods (903), the upper ends of the second vertical rods (904) being fixedly connected to the first horizontal rods (902).

8. A counterweight maintenance platform according to claim 7, characterized in that, A kick plate (905) is fixedly connected to the lower part of the two first vertical inserts (901) and a plurality of second vertical inserts (904).

9. A counterweight maintenance platform according to claim 1, characterized in that, The first platform (6) is provided with casters (5) with brake devices at the four corners of its lower end. The third platform (8) is provided with a support (807) at its lower end. The support (807) and the fourth connecting ear (804) are located at the two ends of the third platform (8), respectively. The height of the support (807) matches the height of the caster (5).

10. A counterweight maintenance platform according to claim 1, characterized in that, The first square frame is fixedly connected to a first filler plate (607) at the same end as the first connecting ear (604), the second square frame is fixedly connected to two ends of a second filler plate (704), and the third square frame is fixedly connected to a third filler plate (808) at the same end as the fourth connecting ear (804).

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