Prefabricated frame structure for smart cultural tourism cabin and its connection method

Abstract

This invention discloses a prefabricated frame structure and its connection method for a smart cultural tourism cabin. The structure includes a first longitudinal beam and a second longitudinal beam. The first and second longitudinal beams are respectively vertically connected to a first crossbeam and a second crossbeam in the horizontal direction. A connector is provided at the connecting end of the first longitudinal beam, and a connecting sleeve that mates with the connector is provided at the connecting end of the second longitudinal beam. When the connector is connected to the connecting sleeve, the first and second longitudinal beams achieve an opposing insertion connection. This invention, by providing interlocking connectors and connecting sleeves at the connecting ends of the first and second longitudinal beams, and by providing interlocking first and second crossbeams in the horizontal direction, enables quick and convenient connection of the first and second longitudinal beams and the first and second crossbeams, thereby improving the assembly efficiency of the building frame and enhancing the connection strength through the connectors and locking bolts.

Description

Technical Field

[0001] This invention relates to the field of steel structure building frame connection equipment technology, specifically a prefabricated frame structure for a smart cultural tourism cabin and its connection method. Background Technology

[0002] Chinese Patent Publication No. CN112127472A discloses a frame connection system for multi-story buildings, comprising at least two square frames, each including columns and beams. The columns and beams are connected by connectors, and the beams are connected to the connectors to form the plane of the frame. The connectors include corner column connectors, side column connectors, and center column connectors. The corner column connectors are connected to columns at their upper and lower ends. The edges of the upper and lower planes of the frame are connected by columns and corner column connectors. The side column connectors are connected to columns at their upper and lower ends. The outer surfaces of the upper and lower planes of the frame, excluding the edges and corners, are connected by columns and side column connectors. The center column connectors are connected to columns at their upper and lower ends. The interior surfaces of the upper and lower planes of the frame are connected by columns and center column connectors. However, in practical use, the following drawbacks still exist: the above frame structure requires a large number of bolts and welding during installation, resulting in complex and inefficient installation. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated frame structure for smart cultural tourism cabins and its connection method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A prefabricated frame structure for a smart cultural tourism cabin includes a first longitudinal beam and a second longitudinal beam. The first longitudinal beam and the second longitudinal beam are respectively vertically connected to a first crossbeam and a second crossbeam in the horizontal direction. The first longitudinal beam is provided with a connector at its connecting end, and the second longitudinal beam is provided with a connecting sleeve that mates with the connector at its connecting end. When the connector is connected to the connecting sleeve, the first longitudinal beam and the second longitudinal beam are connected by an opposing insertion, and the first crossbeam and the second crossbeam are connected by a snap-fit ​​connection.

[0006] Preferably, the connector includes two sets of vertically spaced first connecting plates, which are connected by a horizontally arranged second connecting plate. The second connecting plate has a vertically formed first connecting groove. The connecting sleeve includes a connecting frame, in which a support plate for supporting the second connecting plate is horizontally arranged. The support plate has multiple sets of third connecting plates vertically arranged. The connecting frame has a vertically formed second connecting groove that penetrates its top plate and the support plate. When the connector and the connecting sleeve are connected, the first connecting plate is engaged in the second connecting groove, and the third connecting plate is engaged in the first connecting groove.

[0007] Preferably, the first longitudinal beam is provided with a connector for connecting the connector head and the connecting sleeve. The connector includes a rod, with a threaded end and a first nut located on the first longitudinal beam at both ends. The rod passes through the mounting hole on the first longitudinal beam, the second connecting hole on the top plate of the connecting frame, and the first connecting hole on the second connecting plate in sequence, so that the threaded end at the bottom is threadedly connected to the threaded hole on the support plate.

[0008] Preferably, an expansion joint is provided on the first connecting hole, so that when the rod enters the first connecting hole, it drives the second connecting plate to extend along the length direction.

[0009] Preferably, the first crossbeam is provided with a protrusion, and the second crossbeam is provided with a groove that mates with the protrusion.

[0010] Preferably, the protrusion is provided with multiple sets of hooks along its length, the groove is provided with multiple sets of slots that cooperate with the hooks, and the first or second crossbeam is provided with a driving member for driving the hooks into the slots.

[0011] Preferably, the driving component is a protrusion integrally disposed inside the groove.

[0012] Preferably, the driving component is a locking bolt disposed inside the protrusion. The locking bolt includes a screw rod with a second nut and a thread at both ends, respectively. A sleeve is sleeved on the screw rod. A third nut is disposed on one end of the sleeve near the second nut. A driving nut that is threadedly connected to the screw rod is integrally disposed on the other end of the sleeve. The lower part of the sleeve is provided with two sets of vertical dividing grooves and three sets of horizontal bending control grooves, thereby dividing the sleeve from top to bottom into a sleeve part, a second bending plate, and a first bending plate. When the driving nut moves upward along the screw rod, the second bending plate and the first bending plate unfold to both sides, thereby driving the hook to enter the slot.

[0013] Preferably, the first longitudinal beam and the second longitudinal beam are vertically connected in the vertical direction to a first column and a second column that can be interlocked with each other.

[0014] The present invention also provides a connection method, including the prefabricated frame structure for a smart cultural tourism cabin described above, and further including the following specific steps:

[0015] S1: Keep the height of the second connecting plate in the connector between the third connecting plate and the top plate of the connecting frame, and insert the first connecting plate into the second connecting groove in the connecting sleeve.

[0016] S2: Move the first longitudinal beam down so that the third connecting plate is engaged in the first connecting groove, and at the same time, make the protrusion on the first crossbeam engage in the groove on the second crossbeam;

[0017] S3: Install the connector so that the rod of the connector passes through the mounting hole, the second connecting hole and the first connecting hole on the first longitudinal beam in sequence, and finally the threaded end of the lower end of the connector is threadedly connected to the threaded hole.

[0018] S4: Under the action of the protrusion, the hook on the protrusion is driven into the slot or the locking bolt is installed, so that the locking bolt passes through the mounting hole on the first crossbeam into the slot in sequence. The second nut is rotated, and the lower driving nut is driven to move upward along the screw, thereby driving the first bending plate and the second bending plate to unfold to both sides, thereby driving the hook into the slot.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention provides a connector and a connecting sleeve that can be interlocked at the connection end of the first longitudinal beam and the second longitudinal beam. At the same time, by providing a first crossbeam and a second crossbeam that can be interlocked in the horizontal direction, the first longitudinal beam and the second longitudinal beam, the first crossbeam and the second crossbeam can be quickly and conveniently disassembled and assembled, and can be reused, which greatly improves the assembly efficiency of the house frame.

[0021] 2. The first and second crossbeams in this invention adopt a "convex-concave" design, with the "convex groove" and "recessed groove" tightly connected, which greatly improves the overall lateral stiffness of the structure. At the same time, the "convex-concave" design in the crossbeams also improves the longitudinal connection strength of the structure. Furthermore, the "convex groove" and "recessed groove" positioning greatly reduces the positioning difficulty and improves the assembly speed compared to bolt connection and welding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the steel frame structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the various connecting beams in the frame structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of each connecting beam in the frame structure of the present invention from another angle;

[0025] Figure 4 for Figure 2 Enlarged schematic diagram of the structure in area B;

[0026] Figure 5 for Figure 3 Enlarged schematic diagram of the structure in area C;

[0027] Figure 6 This is a schematic diagram of the first and second crossbeams of the present invention;

[0028] Figure 7 for Figure 6 Enlarged schematic diagram of the structure in area A;

[0029] Figure 8 This is a schematic diagram of the assembly structure of the connector and connecting sleeve of the present invention;

[0030] Figure 9 This is an exploded view of the assembly structure of the connector and connecting sleeve of the present invention;

[0031] Figure 10 This is a schematic diagram of the locking bolt structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the first and second bent plates in the unfolded state of the locking bolt of the present invention;

[0033] Figure 12 This is a schematic diagram of the assembly structure of the first and second crossbeams of the present invention (the driving component is a locking bolt);

[0034] Figure 13 This is a schematic diagram of the assembly structure of the first and second crossbeams of the present invention (the driving component is a protrusion);

[0035] In the diagram: 1 First longitudinal beam, 2 Second longitudinal beam, 3 First crossbeam, 31 Protrusion, 32 Hook, 4 Second crossbeam, 41 Groove, 42 Slot, 5 First column, 6 Second column, 7 Connector, 71 First connecting plate, 72 Second connecting plate, 73 First connecting groove, 74 First connecting hole, 75 Expansion joint, 8 Connecting sleeve, 81 Connecting frame, 82 Support plate, 83 Third connecting plate, 84 Second connecting groove, 85 Second connecting hole, 86 Threaded hole, 9 Connector, 91 Rod, 92 Threaded end, 93 First nut, 10 Protrusion, 111 Locking bolt, 111 Screw, 112 Second nut, 113 Sleeve, 114 Third nut, 115 Drive nut, 116 Bending control groove, 117 First bending plate, 118 Second bending plate, 119 Sleeve. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1-13 The present invention provides a technical solution:

[0038] Example 1:

[0039] A prefabricated frame structure for a smart cultural tourism cabin includes multiple sets of first longitudinal beams 1 and second longitudinal beams 2. Both the first longitudinal beams 1 and the second longitudinal beams 2 are square steel structures. The first longitudinal beams 1 and the second longitudinal beams 2 are respectively vertically connected to first crossbeams 3 and second crossbeams 4 in the horizontal direction. The connecting end of the first longitudinal beam 1 is provided with a connector 7, and the connecting end of the second longitudinal beam 2 is provided with a connecting sleeve 8 that cooperates with the connector 7. When the connector 7 is connected to the connecting sleeve 8, the first longitudinal beam 1 and the second longitudinal beam 2 are connected by an opposing insertion, and the first crossbeam 3 and the second crossbeam 4 are connected by a snap-fit ​​connection. In the technical solution of this embodiment, the connector 7 is located inside the connecting end of the first longitudinal beam 1, and the connecting sleeve 8 is located outside the connecting end of the second longitudinal beam 2, so that when the connector 7 and the connecting sleeve 8 are connected, the first longitudinal beam 1 and the second longitudinal beam 2 are tightly connected.

[0040] The connector 7 includes two sets of vertically spaced first connecting plates 71, which are connected by two sets of horizontally spaced second connecting plates 72 to form a "well" structure. The two sets of second connecting plates 72 are symmetrically spaced, and each second connecting plate 72 has two sets of vertically spaced first connecting grooves 73. The connecting sleeve 8 includes a connecting frame 81, which is a rectangular frame structure without a left side or bottom surface. A support plate 82 for supporting the second connecting plates 72 is horizontally arranged inside the connecting frame 81. When the connector 7 is inserted into the connecting sleeve 8, the second connecting plates 72 are supported on the support plate 82. Multiple sets of third connecting plates 83 are vertically arranged on the support plate 82. In this embodiment, the third connecting plates 83 have a total of Two sets of third connecting plates 83 are provided (the number of which is consistent with the number of first connecting slots 73), and the third connecting plate 83 is connected to the front and rear side plates of the connecting frame 81 in the height direction. Two sets of second connecting slots 84 are vertically provided on the connecting frame 81, penetrating its top plate and support plate 82. When the connector 7 and the connecting sleeve 8 are connected, the first connecting plate 71 is engaged in the second connecting slot 84, and the third connecting plate 83 is engaged in the first connecting slot 73. As can be seen from the above structural description, by setting the connector 7 and the connecting sleeve 8 at both ends of the first longitudinal beam 1 and the second longitudinal beam 2, the first longitudinal beam 1 and the second longitudinal beam 2 are quickly connected, thereby improving the assembly efficiency, avoiding the cumbersome operation of bolts and welding in the prior art, and at the same time, enabling each connecting component to be reused.

[0041] In order to improve the stability of the connection between the connector 7 and the connecting sleeve 8, a connecting member 9 for connecting the connector 7 and the connecting sleeve 8 is detachably provided on the first longitudinal beam 1. In the technical solution of this embodiment, two groups of connecting members 9 are provided. The connecting member 9 includes a rod portion 91. Threaded ends 92 are provided at both ends of the rod portion 91, and a first nut 93 located on the first longitudinal beam 1. The rod portion 91 sequentially passes through the mounting hole on the first longitudinal beam 1, the second connection hole 85 on the top plate of the connecting frame 81, and the first connection hole 74 on the second connecting plate 72, so that the lower threaded end 92 is threadedly connected to the threaded hole 86 on the support plate 82;

[0042] The diameter of the rod portion 91 is larger than the diameter of the first connection hole 74. An expansion slit 75 is provided in the first connection hole 74 (so that the first connection hole 74 forms an expansion hole structure), so that when the rod portion 91 enters the first connection hole 74, it can drive the second connecting plate 72 to extend in the length direction. The advantage of this setting is that the second connecting plate 72 can extend (expand) in the length direction, greatly improving the acting force between the connector 7 and the connecting sleeve 8, enabling the first connecting plate 71 to be tightly clamped into the second connection groove 84 and the first connection groove 73 to be tightly clamped to the third connecting plate 83, improving the stability of the connection between the first longitudinal beam 1 and the second longitudinal beam 2, reducing the tiny gaps at the connection in the traditional connection, and greatly improving the integrity of the frame structure;

[0043] In order to enable the first cross beam 3 and the second cross beam 4 to be connected conveniently and quickly, a convex portion 31 is provided on the first cross beam 3, and a groove 41 matching the convex portion 31 is provided on the second cross beam 4. That is, the cross section of the first cross beam 3 is a "convex" - shaped structure, and the cross section of the second cross beam 4 is a "concave" - shaped structure; The first cross beam 3 and the second cross beam 4 adopt a "convex - concave" design, and the convex portion 31 is tightly connected to the groove 41 by clamping, greatly improving the overall lateral stiffness of the structure; At the same time, the "convex - concave" design in the cross beam also improves the longitudinal connection strength of the structure. Moreover, compared with bolt connection and welding, the "convex - groove" and "concave - groove" cooperation for positioning greatly reduces the positioning difficulty and improves the assembly speed;

[0044] In order to enable the first cross beam 3 and the second cross beam 4 to be firmly connected, multiple groups of hooks 32 are provided along the length direction of the convex portion 31, and multiple groups of slots 42 matching the hooks 32 are provided in the groove 41. A driving member for driving the hooks 32 into the slots 42 is provided on the first cross beam 3 or the second cross beam 4;

[0045] The driving member is a convex block 10 integrally provided inside the groove 41. When the convex portion 31 of the first cross beam 3 enters the groove 41, the hooks 32 on both sides of the convex portion 31 contact the convex block 10, and then drive the hooks 32 to move to both sides and then enter the slots 42, realizing the firm connection and locking of the first cross beam 3 and the second cross beam 4;

[0046] The first longitudinal beam 1 and the second longitudinal beam 2 are vertically connected in the vertical direction to a first column 5 and a second column 6 that can be interlocked with each other. The first column 5 and the second column 6 provide vertical support for the entire frame. The first column 5 is provided with a groove, and the second column 6 is provided with a protrusion that matches the groove. When the first longitudinal beam 1 and the second longitudinal beam 2 are inserted into each other, the protrusion of the second column 6 is interlocked with the groove of the first column 5.

[0047] The present invention also provides a connection method, including the above-mentioned prefabricated frame structure for a smart cultural tourism cabin, and further including the following specific steps:

[0048] S1: Keep the height of the second connecting plate 72 in the connector 7 between the top plate of the third connecting plate 83 and the connecting frame 81, that is, the initial installation height of the first longitudinal beam 1 should be slightly higher than the second longitudinal beam 2, and insert the first connecting plate 71 into the second connecting groove 84 in the connecting sleeve 8.

[0049] S2: Move the first longitudinal beam 1 down so that the third connecting plate 83 is engaged in the first connecting groove 73, and at the same time, make the protrusion 31 on the first cross beam 3 engaged in the groove 41 on the second cross beam 4.

[0050] S3: Install two sets of connectors 9, so that the rod 91 of the connector 9 passes through the mounting hole, the second connecting hole 85 and the first connecting hole 74 on the first longitudinal beam 1 in sequence, and finally the threaded end 92 at the lower end of the connector 9 is threadedly connected to the threaded hole 86.

[0051] S4: Under the action of the protrusion 10, the hook 32 on the drive protrusion 31 enters the slot 42 or the locking bolt 11 is installed, so that the locking bolt 11 passes through the mounting hole on the first crossbeam 3 to the slot 42 in sequence. The second nut 112 is rotated, and the lower drive nut 115 is driven to move upward along the screw 111, thereby driving the first bending plate 117 and the second bending plate 118 to unfold to both sides, thereby driving the hook 32 to enter the slot 42.

[0052] Example 2:

[0053] The difference from the above embodiments is that:

[0054] The driving component is a locking bolt 11 located inside the protrusion 31. The locking bolt 11 includes a screw 111 with a second nut 112 and a thread at both ends. A sleeve 113 is fitted onto the screw 111. A third nut 114 is provided on the end of the sleeve 113 near the second nut 112. The purpose of the third nut 114 is to prevent the sleeve 113 from rotating when the screw 111 is rotated by the second nut 112. The operator can use a wrench to brake the third nut 114 so that it does not rotate. The sleeve 113 is integrated with a drive nut 115 at the other end, which is connected to the threaded end of the screw 111. The lower part of the sleeve 113 has two sets of vertical dividing grooves and three sets of horizontal bending control grooves 116, thus dividing the sleeve 113 from top to bottom into a connecting part 119, a second bending plate 118, and a first bending plate 117. The horizontal bending control grooves 116 are used to control the angle and starting position of the second bending plate 118 and the first bending plate 117, and the vertical dividing grooves are used to control the second bending... The number of plates 118 and 117 can be determined by either having three sets of vertical dividing slots, allowing the second bending plate 118 and the first bending plate 117 to unfold in three directions (three sets of the second bending plate 118 and the first bending plate 117 are arranged in a circular array), with the included angle between adjacent bending plates being exactly 120°, or by having four sets of vertical dividing slots (four sets of the second bending plate 118 and the first bending plate 117 are arranged in a circular array), allowing the second bending plate 118 and the first bending plate 117 to unfold in three directions (three sets of the second bending plate 118 and the first bending plate 117 are arranged in a circular array), with the included angle between adjacent bending plates being exactly 120°, or by having four sets of vertical dividing slots, allowing the second bending plate 118 and the first bending plate 117 to unfold in three directions (three sets of the second bending plate 118 and the first bending plate 117 are arranged in a circular array), with the included angle between adjacent bending plates being exactly 120°. The bending plates 117 unfold in four directions, and the included angle between adjacent bending plates is exactly 90°. The cross-sections of the second bending plate 118 and the first bending plate 117 are "C" shaped. The advantage of this design is that its tensile strength is greater than that of traditional expansion bolts. When the drive nut 115 moves upward along the screw 111, the second bending plate 118 and the first bending plate 117 unfold to both sides, thereby driving the hook 32 to enter the slot 42, and finally locking the first crossbeam 3 and the second crossbeam 4 after connection.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated frame structure for a smart cultural tourism cabin, characterized in that: It includes a first longitudinal beam (1) and a second longitudinal beam (2). The first longitudinal beam (1) and the second longitudinal beam (2) are respectively vertically connected to a first crossbeam (3) and a second crossbeam (4) in the horizontal direction. The first longitudinal beam (1) is provided with a connector (7) at the connecting end, and the second longitudinal beam (2) is provided with a connecting sleeve (8) that cooperates with the connector (7) at the connecting end. When the connector (7) is connected to the connecting sleeve (8), the first longitudinal beam (1) and the second longitudinal beam (2) are connected by opposite insertion, and the first crossbeam (3) and the second crossbeam (4) are connected by snap-fit. The connector (7) includes two sets of vertically spaced first connecting plates (71), which are connected by a horizontally arranged second connecting plate (72). The second connecting plate (72) has a vertically arranged first connecting groove (73). The connecting sleeve (8) includes a connecting frame (81), which has a horizontally arranged support plate (82) for supporting the second connecting plate (72). The support plate (82) has multiple sets of third connecting plates (83) arranged vertically. The connecting frame (81) has a vertically arranged second connecting groove (84) that penetrates its top plate and the support plate (82). When the connector (7) and the connecting sleeve (8) are connected, the first connecting plate (71) is engaged in the second connecting groove (84), and the third connecting plate (83) is engaged in the first connecting groove (73). The first crossbeam (3) is provided with a protrusion (31), and the second crossbeam (4) is provided with a groove (41) that matches the protrusion (31). The driving component is a locking bolt (11) that passes through the first crossbeam (3) and the protrusion (31). The locking bolt (11) includes a screw (111) with a second nut (112) and a thread at both ends. A sleeve (113) is fitted onto the screw (111). A third nut (114) is provided on one end of the sleeve (113) near the second nut (112). A driving nut (114) is integrally provided on the other end of the sleeve (113) and connected to the threaded end of the screw (111). 15) The lower part of the sleeve (113) is provided with two sets of vertical dividing grooves and three sets of horizontal bending control grooves (116), which divide the sleeve (113) from top to bottom into a sleeve part (119), a second bending plate (118) and a first bending plate (117). When the drive nut (115) moves upward along the screw (111), the second bending plate (118) and the first bending plate (117) unfold to both sides, thereby driving the hook (32) to enter the slot (42).

2. The prefabricated frame structure for a smart cultural tourism cabin according to claim 1, characterized in that: The first longitudinal beam (1) is provided with a connector (9) for connecting the connector (7) and the connecting sleeve (8). The connector (9) includes a rod (91). The rod (91) has a threaded end (92) and a first nut (93) at both ends. When the connector (5) is installed, the first nut (53) is located on the upper surface of the first longitudinal beam (1), and the rod (91) passes through the mounting hole on the first longitudinal beam (1), the second connecting hole (85) on the top plate of the connecting frame (81), and the first connecting hole (74) on the second connecting plate (72) in sequence, so that the threaded end (92) at the bottom is threadedly connected to the threaded hole (86) on the support plate (82).

3. The prefabricated frame structure for a smart cultural tourism cabin according to claim 2, characterized in that: An expansion joint (75) is provided on the first connecting hole (74), so that when the rod (91) enters the first connecting hole (74), it drives the second connecting plate (72) to extend along the length direction.

4. The prefabricated frame structure for a smart cultural tourism cabin according to claim 1, characterized in that: The protrusion (31) is provided with multiple sets of hooks (32) along its length direction, and the groove (41) is provided with multiple sets of slots (42) that cooperate with the hooks (32). The first crossbeam (3) or the second crossbeam (4) is provided with a driving member for driving the hooks (32) into the slots (42).

5. The prefabricated frame structure for a smart cultural tourism cabin according to claim 1, characterized in that: The driving component is a protrusion (10) integrally disposed inside the groove (41).

6. A prefabricated frame structure for a smart cultural tourism cabin according to any one of claims 1-5, characterized in that: The first longitudinal beam (1) and the second longitudinal beam (2) are vertically connected to a first column (5) and a second column (6) that can be interlocked with each other.

7. A connection method, characterized in that: The prefabricated frame structure for a smart cultural tourism cabin, as described in any one of claims 1-6, further includes the following specific steps: S1: Keep the height of the second connecting plate (72) in the connector (7) between the top plate of the third connecting plate (83) and the connecting frame (81), and insert the first connecting plate (71) into the second connecting groove (84) in the connecting sleeve (8); S2: Move the first longitudinal beam (1) down so that the third connecting plate (83) is engaged in the first connecting groove (73), and at the same time, make the protrusion (31) on the first cross beam (3) engaged in the groove (41) on the second cross beam (4); S3: Install the connector (9) so that the rod (91) of the connector (9) passes through the mounting hole, the second connecting hole (85) and the first connecting hole (74) on the first longitudinal beam (1) in sequence, and finally the threaded end (92) at the lower end of the connector (9) is threadedly connected to the threaded hole (86). S4: Under the action of the protrusion (10), the hook (32) on the protrusion (31) is driven into the slot (42) or the locking bolt (11) is installed, so that the locking bolt (11) passes through the mounting hole on the first crossbeam (3) to the slot (42) in sequence. The second nut (112) is rotated, and the lower driving nut (115) is driven to move upward along the screw (111), thereby driving the first bending plate (117) and the second bending plate (118) to unfold to both sides, thereby driving the hook (32) to enter the slot (42).

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