Aluminum formwork support device

Abstract

An aluminum formwork support device is used with aluminum formwork and comprises: two ground connection seats, a load-bearing member, and a support component. The first connecting part of each ground connection seat is inserted along the embedding axis into the cement slurry floor. The cement slurry floor solidifies to form a cement floor to encapsulate the first connecting part. The second connecting part is located on the surface of the cement floor and forms an insertion space along the penetrating axis. In addition, the two opposite ends of the load-bearing member are inserted along the penetrating axis into the insertion space of one of the ground connection seats, and the support component connects the load-bearing member and the aluminum formwork. Thus, before the cement slurry floor solidifies into a cement floor, the first connecting part of the ground connection seat is pre-embedded inside the cement slurry floor, and then the support component can be connected between the load-bearing member and the aluminum formwork, thereby avoiding the support component being directly connected to the cement floor by fasteners, and relatively reducing the risk of fasteners damaging the pre-embedded lines inside the cement floor.

Description

Technical Field

[0001] This invention relates to an aluminum formwork support device for building construction, and more particularly to an aluminum formwork support device that can effectively reduce the risk of damage to wires embedded in the cement floor by fasteners during the process of connecting the aluminum formwork support device to the cement floor through fasteners. Prior Technology

[0002] In the foundation engineering of concrete buildings, construction workers first need to tie multiple steel bars into a steel structure. Then, the construction workers place multiple interconnected formworks along the outline of the steel structure, so that the multiple formworks together form a grouting space to accommodate the steel structure. Next, concrete is poured into the grouting space and waited for the concrete to solidify and take shape inside the grouting space, so that the concrete and the steel structure together form the walls or beams and columns of the building.

[0003] Currently, the most common formwork is wooden formwork, which is easy to cut into various shapes, allowing the walls and beams of buildings to have various shapes and outlines. However, wooden formwork is prone to rotting when exposed to rainwater, which limits its service life. With the continuous advancement of technology, in order to improve the short service life of wooden formwork, there is now an aluminum formwork made of aluminum. When aluminum formwork is installed, it is used with aluminum formwork support devices. When concrete is poured into the grouting space formed by the aluminum formwork, the aluminum formwork support devices can effectively prevent the aluminum formwork from deforming or collapsing due to pressure during the concrete grouting process, thereby improving the efficiency and durability of the aluminum formwork.

[0004] However, when aluminum formwork support devices are used with aluminum formwork, one end of the support device is connected to the aluminum formwork, while the other end is connected to the concrete floor through fasteners. During the fastener installation process in the concrete floor, the wiring embedded in the concrete floor may be damaged. Therefore, the process of connecting the aluminum formwork support device between the aluminum formwork and the concrete floor needs to be carefully evaluated, and effective preventive measures should be taken to ensure the safety of the project. This can relatively avoid the need to spend time repairing the wiring embedded in the concrete floor later. Summary of the Invention

[0005] The main objective of this invention is to improve the structural formwork support device, so that when the improved aluminum formwork support device is connected between the aluminum formwork and the cement floor, the improved aluminum formwork support device can effectively reduce the risk of damaging the wiring embedded in the cement floor. This not only ensures the construction safety of the improved aluminum formwork support device during construction, but also reduces the risk of construction accidents.

[0006] The secondary objective of this invention is to improve the structural form of the mud floor connector. The improved mud floor connector allows the second connecting part to be selectively disassembled into the first connecting part, so that the first connecting part of the improved mud floor connector can be freely embedded in any position of the cement floor. When the carrier is assembled into the mud floor connector, the opposite ends of the carrier can be inserted into the insertion space of one of the second connecting parts respectively. Then, the second connecting parts of the two rear mud floor connectors can be moved and adjusted relative to the carrier according to the interval between the first connecting parts of the two rear mud floor connectors, and then the second connecting part is connected to the first connecting part to facilitate the assembly of the carrier into the mud floor connector.

[0007] To achieve the aforementioned objectives, the present invention provides an aluminum formwork support device, which is used in conjunction with an aluminum formwork and includes: two soil connection seats, a bearing member, and a support assembly.

[0008] Each of the aforementioned mud floor connectors is provided with a first connecting part and a second connecting part. The first connecting part is inserted into a cement slurry floor along a buried axis. The cement slurry floor solidifies to form a cement floor that can cover the first connecting part. The second connecting part is located on the surface of the cement floor and forms an insertion space along a through axis that intersects the buried axis.

[0009] The aforementioned carrier is inserted into the insertion space of one of the aforementioned mud-ground connecting seats at its opposite ends along the aforementioned through-axis, such that the central section of the aforementioned carrier is set as an exposed section located between the two aforementioned second connecting parts, and the aforementioned support assembly is connected between the aforementioned exposed section and the aluminum template.

[0010] The aforementioned mud connector has a mud joint constituting the first connection part, a mud connecting frame constituting the second connection part, and a mud connector that can connect the mud connecting frame to the mud joint. The mud joint has a screw hole inside, and the mud connector passes through the mud connecting frame to be screwed into the screw hole. The mud connecting frame has a cover plate, two side plates, and two extension plates. The opposite ends of the cover plate respectively form the side plates, and each of the side plates extends toward the other side plate to form the extension plate, so that the cover plate, the two side plates, and the two extension plates together form the insertion space.

[0011] In one embodiment, the two aforementioned extension plates contact the aforementioned cement floor, such that the aforementioned cover plates are spaced apart above the aforementioned cement floor. When the aforementioned mud floor connector passes through the aforementioned mud floor connecting frame to be spirally fitted into the aforementioned screw hole, a portion of the aforementioned mud floor connector is located inside the aforementioned screw hole, while another portion of the aforementioned mud floor connector is located inside the aforementioned insertion space, and the remaining portion of the aforementioned mud floor connector is located outside the aforementioned insertion space.

[0012] In another embodiment, the cover plate contacts the cement floor, such that the two extension plates are spaced apart above the cement floor. When the mud floor connector passes through the mud floor connecting frame to be screwed into the screw hole, a portion of the mud floor connector is located inside the insertion space, while the remaining portion of the mud floor connector is located inside the screw hole.

[0013] In the two embodiments described above, the cover plate forms a through hole communicating with the insertion space, and the two extension plates are arranged at intervals to form a communicating opening communicating with the insertion space between the two extension plates. Both the through hole and the communicating opening are located opposite the screw hole, so the mud connector can be inserted into the through hole, the communicating opening and the screw hole at the same time.

[0014] Furthermore, the aforementioned insertion space is divided into a first penetration area and a second penetration area through the aforementioned mud connector. The first penetration area can be penetrated by the aforementioned support member, while the aforementioned second penetration area can be penetrated by an auxiliary support member. The aforementioned mud connector is provided with a plurality of conical steps and a plurality of annular grooves on its periphery. The aforementioned screw holes are formed inside a portion of the aforementioned conical steps, and each of the aforementioned annular grooves is located between every two adjacent conical steps.

[0015] Furthermore, the aforementioned mud connector has a hole cover, and when the aforementioned mud connector frame is separated from the aforementioned mud joint, the hole cover can be connected to the aforementioned screw hole, so that the hole cover can cover the aforementioned screw hole.

[0016] In addition, the aforementioned support assembly has a carrier mounting bracket and a support rod. The carrier mounting bracket is connected to the aforementioned exposed section. The two ends of the support rod are respectively pivotally connected to the aforementioned aluminum template and the carrier mounting bracket. The support rod has a first adjusting bolt pivotally connected to the aforementioned aluminum template, a second adjusting bolt pivotally connected to the aforementioned carrier mounting bracket, and a main support sleeve located between the aforementioned first adjusting bolt and the second adjusting bolt. The aforementioned first adjusting bolt and the second adjusting bolt are respectively spirally fitted into the opposite ends of the aforementioned main support sleeve, so that the aforementioned first adjusting bolt and the second adjusting bolt can move relative to the aforementioned main support sleeve by rotation, so that the overall length of the aforementioned support rod can be extended or contracted.

[0017] The invention is characterized in that, before the cement slurry floor solidifies into a cement floor, the first connecting part of the mud floor connector is pre-embedded inside the cement slurry floor, and then the support component can be connected between the bearing member and the aluminum formwork. This avoids the support component being directly connected to the cement floor through the fasteners, which can reduce the risk of the fasteners damaging the wiring pre-embedded inside the cement floor. In this way, it can not only ensure the construction safety of the improved aluminum formwork support device during construction, but also reduce the risk of construction accidents.

[0018] In addition, the mud floor connector has a mud floor joint, a mud floor connecting frame, and a mud floor connector. The mud floor joint constitutes the first connecting part, and the mud floor connecting frame constitutes the second connecting part. The mud floor connector is used to connect the mud floor connecting frame to the mud floor joint, allowing the mud floor connecting frame to be selectively assembled or removed from the mud floor joint through the mud floor connector. This allows the mud floor joint to be freely embedded in any position on the cement floor. When the load-bearing member is assembled with the mud floor connecting frame, the opposite ends of the load-bearing member can be inserted into the insertion space of one of the mud floor connecting frames. Then, the two mud floor connecting frames can be moved and adjusted relative to the load-bearing member according to the distance between the two mud floor joints. The mud floor connecting frame is then connected to the mud floor joint through the mud floor connector to facilitate the quick assembly of the load-bearing member with the mud floor connector. Simple Explanation of the Diagram

[0019] Figure 1 is a schematic diagram of the aluminum formwork support device of the present invention used in conjunction with aluminum formwork; Figure 2 is a perspective view of the aluminum template support device of the present invention; Figure 3 is an exploded view of the aluminum template support device of the present invention; Figure 4 is an exploded view of the mud-ground connection seat in Figure 3; Figure 5 is an exploded cross-sectional view of the mud-ground connector embedded in the cement slurry floor in Figure 3; Figure 6 is a cross-sectional view of the mud-ground connector embedded in the cement slurry floor in Figure 3; Figure 7A is a schematic diagram showing the two extension plates of the mud floor connection frame in contact with the cement floor; Figure 7B is a schematic diagram of the cover plate of the mud floor connection frame contacting the cement floor; Figure 8 is a schematic diagram showing that the mud-ground connecting seat is simultaneously penetrated by both the bearing component and the auxiliary bearing component; Figure 9 is an exploded view of the support components in Figure 3; Figure 10 is a partial cross-sectional view of the support component; Figure 11 is a schematic diagram of the support component connected to the load-bearing member; and Figure 12 is a schematic diagram showing how the cap can cover the screw hole. Implementation

[0020] To facilitate a deeper and more detailed understanding of the structure, use, and features of the present invention, preferred embodiments are described below in conjunction with the accompanying drawings:

[0021] Please refer to Figures 1, 2 and 3. The aluminum formwork support device 1 of the present invention is disposed between an aluminum formwork 40 and a cement floor 50. The aluminum formwork support device 1 is mainly composed of two cement floor connecting seats 10, a bearing member 20 and a support component 30.

[0022] Please refer to Figures 3, 4, and 5. Each cement floor connector 10 has two parts: a first connecting part 11 and a second connecting part 12. The first connecting part 11 is inserted into a cement floor 60 along a longitudinally oriented burial axis L1 (as shown in Figure 6). However, during the burial process of the first connecting part 11 into the cement floor 60, even if the first connecting part 11 comes into contact with the wires pre-embedded inside the cement floor 60, the good fluidity of the cement floor 60 allows the wires to be pushed away by the first connecting part 11. The first connecting part 11 will be displaced upon contact with the wire, thus avoiding damage to the wire. The cement slurry floor 60 solidifies to form a cement floor 50 to cover the first connecting part 11, while the second connecting part 12 is located on the surface of the cement floor 50. The second connecting part 12 forms an insertion space 13 along a transverse through-axis L2 (as shown in Figure 6). As shown, the embedded axis L1 is intersected and arranged at the through-axis L2. In a preferred embodiment, the embedded axis L1 is arranged perpendicularly to the through-axis L2.

[0023] Please refer to Figures 3, 4, 5, and 6. In this embodiment, the mud floor connector 10 has three parts: a mud floor joint 14, a mud floor connecting frame 15, and a mud floor connector 16. The mud floor joint 14 is embedded in the cement slurry floor 60, so that the mud floor joint 14 is a separate component of the first connecting portion 11 of the mud floor connector 10. The mud floor joint 14 has a plurality of conical steps 141, and a screw hole 142 is formed by recessing from one end of the mud floor joint 14 toward the interior of the mud floor joint 14. The screw hole 142 is formed inside a portion of the conical steps 141. In the process, the mud joint 14 is provided with a plurality of annular grooves 143 around its periphery. Each annular groove 143 is located between every two adjacent conical steps 141, so that when the mud joint 14 is embedded in the cement slurry floor 60, the cement slurry of the cement slurry floor 60 will flow into the interior of each annular groove 143. When the cement slurry floor 60 solidifies into a cement floor 50, the interior of each annular groove 143 will contain the solid cement of the cement floor 50, which can prevent the mud joint 14 from detaching from the cement floor 50, thereby relatively improving the structural strength of the mud joint 14 connected to the cement floor 50.

[0024] Furthermore, the mud floor connecting frame 15 of the mud floor connecting seat 10 has a cover plate 151, two side plates 152, and two extension plates 153. The opposite ends of the cover plate 151 form side plates 152, and each side plate 152 extends from the end away from the cover plate 151 toward the other side plate 152 to form an extension plate 153, so that the cross-section of the mud floor connecting frame 15 is approximately U-shaped. The cover plate 151, the two side plates 152, and the two extension plates 153 together form an insertion space 13. The cover plate 151 forms a through hole 154 communicating with the insertion space 13, and the two extension plates 153 are arranged at intervals to form a communicating opening 155 communicating with the insertion space 13 between the two extension plates 153. The through hole 154 and the communicating opening 155 are located on opposite sides of the insertion space 13. In this embodiment, when the mud floor connecting frame 15 contacts the cement floor... At 50°, both the through hole 154 and the connecting opening 155 are located opposite the screw hole 142, as shown in the figure. The mud connector 16 of the mud connector 10 has a connecting head 161 and a connecting body 162. The transverse cross-sectional profile of the connecting head 161 is between the profile of the through hole 154 and the profile of the connecting opening 155. The connecting body 162 is formed at one end of the connecting head 161. The transverse cross-sectional profile of the connecting body 162 is smaller than that of the connecting head 161. The connecting body 162 can pass through the through hole 154 of the mud connector frame 15, the connecting opening 155 of the mud connector frame 15, and the screw hole 142 of the mud connector 14. This allows the mud connector 16 to pass through the mud connector frame 15 and be screwed into the screw hole 142. The mud connector 16 can then be used to selectively assemble and disassemble the mud connector 14 from the mud connector frame 15.

[0025] Please refer to Figure 7A. The two extension plates 153 of the dirt floor connector 15 contact the cement floor 50, such that the cover plates 151 of the dirt floor connector 15 are spaced apart above the cement floor 50. When the connecting body 162 of the dirt floor connector 16 sequentially passes through the through hole 154 and the communicating opening 155 of the dirt floor connector 15 to be screwed into the screw hole 142 of the dirt floor connector 14, the connecting head 161 of the dirt floor connector 16 cannot pass through the through hole 154 of the dirt floor connector 15 and will contact the cover plate 151. This makes the connecting head 161 located outside the insertion space 13 of the dirt floor connector 15, while a part of the connecting body 162 is located in the screw hole 142 of the dirt floor connector 14. Inside 42, the remaining part of the connecting body 162 is located inside the insertion space 13. However, the mud floor connecting frame 15 is only for illustrative purposes when the two extension plates 153 are in contact with the cement floor 50. That is, as shown in Figure 7B, the cover plate 151 of the mud floor connecting frame 15 is in contact with the cement floor 50, so that the two extension plates 153 are arranged at intervals above the cement floor 50. When the connecting body 162 passes through the connecting opening 155 and the through hole 154 in sequence, the connecting head 161 will pass through the connecting opening 155 to contact the cover plate 151, so that the connecting head 161 is located inside the insertion space 13, while the entire connecting body 162 is located inside the screw hole 142.

[0026] Please refer to Figures 3 and 7A. One end of the carrier 20 is inserted into the insertion space 13 of one of the mud-brick connectors 10 along the through-axis L2, so that one end of the carrier 20 can contact the mud-brick connector 16 of one of the mud-brick connectors 10. One end of the carrier 20 is inserted into the insertion space 13 of the other mud-brick connector 10 along the through-axis L2, so that the other end of the carrier 20 can contact the mud-brick connector 16 of the other mud-brick connector 10. Thus, the central section of the carrier 20 is not covered by the mud-brick connection frames 15 of the two mud-brick connectors 10 and is set as an exposed section 21 located at the two second connecting parts 12. In a preferred embodiment, the opposite ends of the carrier 20 can first be inserted into the insertion space 13 of one of the mud-brick connection frames 15 respectively. Subsequently, the two mud-brick connectors... The connecting frame 15 moves relative to the carrier 20 so that the distance between the two mud-ground connecting frames 15 can match the spacing between the two mud-ground joints 14. Then, the mud-ground connecting frame 15 is connected to the mud-ground joint 14 through the mud-ground connector 16, so that the carrier 20 can be quickly assembled into the mud-ground connector 10. However, the mud-ground connector 10 is only illustratively described by the carrier 20. As shown in Figure 8, the insertion space 13 of the mud-ground connecting frame 15 is divided into a first through area 131 and a second through area 132 through the mud-ground connector 16 of the mud-ground connector 10. The first through area 131 can be through the carrier 20, and the second through area 132 can be through an auxiliary carrier 70, so that a single mud-ground connector 10 can be connected to both the carrier 20 and the auxiliary carrier 70 at the same time.

[0027] Please refer to Figures 3, 9, 10, and 11. The support assembly 30 has three parts: a carrier mounting frame 31, a plurality of fasteners 32, and a support rod 33. The carrier mounting frame 31 is connected to the exposed section 21 of the carrier 20 through the plurality of fasteners 32, so that the fasteners 32 can avoid penetrating the cement floor 50, which can reduce the risk of the fasteners 32 damaging the wiring embedded in the cement floor 50. The two ends of the support rod 33 are pivotally connected to the aluminum template 40 and the carrier mounting frame 31, respectively. As shown in the figure, the support rod 33 has a first adjusting bolt 331 pivotally connected to the aluminum template 40, a second adjusting bolt 332 pivotally connected to the carrier mounting frame 31, and a main support sleeve 333 located between the first adjusting bolt 331 and the second adjusting bolt 332. The first adjusting bolt 331 and the second adjusting bolt 332 are respectively spirally engaged. At the opposite ends of the main support sleeve 333, when the first and second adjusting bolts 331 and 332 are respectively connected to the aluminum template 40 and the support mounting bracket 31, the support mounting bracket 31 can rotate to allow the first and second adjusting bolts 331 and 332 to move simultaneously, so that the overall length of the support rod 33 can be extended or retracted. In this embodiment, the support mounting bracket 31 rotates clockwise to allow the first and second adjusting bolts 331 and 332 to extend outward, so that the first and second adjusting bolts 331 and 332 move away from each other and increase the overall length of the support rod 33. Conversely, the support mounting bracket 31 rotates counterclockwise to allow the first and second adjusting bolts 331 and 332 to retract inward, so that the first and second adjusting bolts 331 and 332 move closer to each other and shorten the overall length of the support rod 33.

[0028] Please refer to Figure 12. The mud connector 10 further has a hole cover 17. When the aluminum formwork 40 is grouted and demolding is to be carried out, the mud connector 16 of the mud connector 10 is disengaged from the screw hole 142 of the mud joint 14, so that the mud connecting frame 15 of the mud connector 10 can be separated from the mud joint 14. When the mud connecting frame 15 is separated from the mud joint 14, the hole cover 17 can be connected to the screw hole 142, so that the hole cover 17 can cover the screw hole 142 to prevent dust from entering the interior of the screw hole 142.

[0029] The embodiments described above are only for the convenience of illustrating the present invention and are not intended to limit it. Various simple modifications and alterations made by those skilled in the art based on the scope of the patent application and the description of the invention without departing from the technical scope of the present invention should still be included in the following patent application scope.

[0030] 1: Aluminum formwork support device 10: Mud-ground connector 11: First connecting part 12: Second connecting part 13: Insertion Space 131: First tunneling area 132: Second tunneling area 14: Mud joint 141: Conical step 142: Screw hole 143: Circular slot 15: Mud-ground connection frame 151: Cover plate 152: Side panel 153: Extension board 154: Through hole 155: Connecting opening 16: Mud-ground connector 161: Connect the head 162: Connecting the body 17: Hole Cover 20: Bearing component 21: Exposed Section 30: Support components 31: Load-bearing component mounting bracket 32: Locking hardware 33: Support rod 331: First adjusting bolt 332: Second adjusting bolt 333: Main support sleeve 40: Aluminum formwork 50: Cement floor 60: Cement grout floor 70: Auxiliary load-bearing components L1: Embedded axis L2: Through axis

Claims

1. An aluminum formwork support device, used in conjunction with an aluminum formwork, comprising: two mud-ground connectors, each of the mud-ground connectors having a first connecting portion and a second connecting portion, the first connecting portion being inserted into a cement slurry floor along an embedded axis, the cement slurry floor solidifying to form a cement floor capable of covering the first connecting portion, and the second connecting portion being located on the surface of the cement floor and forming an insertion space along a through-axis intersecting the embedded axis; a carrier member, inserted at opposite ends into the insertion space of one of the mud-ground connectors along the through-axis, such that the central section of the carrier member is an exposed section located between the two second connecting portions; and a support assembly connected between the exposed section and the aluminum formwork.

2. The aluminum formwork support device as described in claim 1, wherein, The aforementioned mud connector has a mud joint constituting the first connection portion, a mud connecting frame constituting the second connection portion, and a mud connector capable of connecting the mud connecting frame to the mud joint. The mud joint has a screw hole inside, and the mud connector passes through the mud connecting frame to be screwed into the screw hole.

3. The aluminum formwork support device as described in claim 2, wherein, The aforementioned mud-ground connection frame has a cover plate, two side plates and two extension plates. The opposite ends of the cover plate respectively form the side plates, and each of the side plates extends toward the other side plate to form the extension plate, such that the cover plate, the two side plates and the two extension plates together form the insertion space.

4. The aluminum formwork support device as described in claim 3, wherein, The cover plate forms a through hole that communicates with the insertion space, and the two extension plates are arranged at intervals to form a connecting opening that communicates with the insertion space between the two extension plates. Both the through hole and the connecting opening are located opposite the screw hole, so the mud connector can be inserted into the through hole, the connecting opening and the screw hole at the same time.

5. The aluminum formwork support device as described in claim 3, wherein, The two aforementioned extension plates contact the aforementioned cement floor, such that the aforementioned cover plates are spaced apart above the aforementioned cement floor. When the aforementioned mud floor connector passes through the aforementioned mud floor connecting frame to be spirally fitted into the aforementioned screw hole, a portion of the aforementioned mud floor connector is located inside the aforementioned screw hole, while another portion of the aforementioned mud floor connector is located inside the aforementioned insertion space, and the remaining portion of the aforementioned mud floor connector is located outside the aforementioned insertion space.

6. The aluminum formwork support device as described in claim 3, wherein, The cover plate contacts the cement floor, such that the two extension plates are spaced apart and arranged above the cement floor. When the mud floor connector passes through the mud floor connection frame and is screwed into the screw hole, a portion of the mud floor connector is located inside the insertion space, while the remaining portion of the mud floor connector is located inside the screw hole.

7. The aluminum formwork support device as described in claim 2, wherein, The aforementioned insertion space is divided into a first penetration area and a second penetration area by the aforementioned mud connector. The first penetration area can be penetrated by the aforementioned support member, while the second penetration area can be penetrated by an auxiliary support member.

8. The aluminum formwork support device as described in claim 2, wherein, The aforementioned mud joint has a plurality of conical steps and a plurality of annular grooves on its periphery. The aforementioned screw holes are formed inside a portion of the aforementioned conical steps, and each of the aforementioned annular grooves is located between every two adjacent conical steps.

9. The aluminum formwork support device as described in claim 2, wherein, The aforementioned mud connector further has a hole cover, and when the aforementioned mud connector frame is separated from the aforementioned mud joint, the aforementioned hole cover can be connected to the aforementioned screw hole, so that the aforementioned hole cover can cover the aforementioned screw hole.

10. The aluminum formwork support device as described in claim 1, wherein, The aforementioned support assembly has a carrier mounting bracket and a support rod. The carrier mounting bracket is connected to the exposed section. The two ends of the support rod are pivotally connected to the aluminum template and the carrier mounting bracket, respectively. The support rod has a first adjusting bolt pivotally connected to the aluminum template, a second adjusting bolt pivotally connected to the carrier mounting bracket, and a main support sleeve located between the first adjusting bolt and the second adjusting bolt. The first adjusting bolt and the second adjusting bolt are respectively spirally fitted into the opposite ends of the main support sleeve, so that the first adjusting bolt and the second adjusting bolt can move relative to the main support sleeve by rotation, so that the overall length of the support rod can be extended or contracted.

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