A concrete formwork support system

Abstract

The utility model discloses a concrete formwork support system relates to building construction technical field, including base, first bracing piece and bracing plate, still include: height adjusting subassembly, install in the top of base, be used for fine adjustment bracing plate's height, angle adjusting subassembly, install in the both ends of first bracing piece, the utility model discloses through setting up angle adjusting subassembly in the both ends of first bracing piece, and connecting base and bracing plate respectively, and angle adjusting subassembly can realize angle adjustment and keep in certain angle fixed, thereby in actual use process can adjust according to the need of being used as top die or side die, when needing to be used as top die, make bracing plate with ground parallel, and the structure is used for supporting such structure as house roof, when needing to be used as side die, make first bracing piece lean, and bracing plate is perpendicular to ground simultaneously, can provide support to vertical concrete formwork, realizes integrated multi -use.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a concrete formwork support system. Background Technology

[0002] In concrete pouring construction, the formwork support system is a core component ensuring structural quality and construction safety. Traditional support systems need to be differentiated based on the construction location; for example, the support requirements for top formwork (such as horizontal structures like roofs and floor slabs) and side formwork (such as vertical structures like walls and columns) are drastically different. Top formwork must bear the weight of the concrete and construction loads, requiring the support system to have sufficient vertical bearing capacity; side formwork, on the other hand, must resist the lateral pressure of the concrete to prevent bulging or displacement. The independent design of these two types of support systems makes it difficult to effectively optimize material and labor costs, becoming a key factor restricting construction efficiency.

[0003] In existing technologies, side formwork support typically employs a combination of wooden formwork and sleepers: horizontal sleepers are fixed to the outside of the formwork, and then scaffolding or diagonal braces are used to provide multi-point support for the sleepers to distribute the lateral pressure of the concrete. Top formwork support, on the other hand, is mostly based on vertical members (such as steel or wooden supports), using adjustable telescopic structures to adapt to different floor height requirements. Some systems also integrate early stripping devices to accelerate formwork turnover. While these solutions demonstrate technological maturity in specific scenarios, their highly customized structural forms and component specifications make it difficult to achieve compatibility and shared support systems between top and side formwork.

[0004] Due to the significant differences in the stress characteristics, installation methods, and accessory standards of the top formwork and side formwork, the existing support system requires the configuration of special components for different construction parts. That is, the side formwork support and the top formwork support require different support systems, which increases the pressure on material inventory and the complexity of on-site management. It also requires repeated handling of the support system during the construction process, which not only increases the overall cost but also limits the adaptability of the support system in complex structures or irregular spaces. Utility Model Content

[0005] The purpose of this invention is to provide a concrete formwork support system to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A concrete formwork support system includes a base, a first strut, and a support plate; it also includes: a height adjustment component installed on the top of the base for fine-tuning the height of the support plate; an angle adjustment component installed at both ends of the first strut; the angle adjustment component located at the bottom of the first strut is connected to the height adjustment component for adjusting the tilt angle of the first strut, and the angle adjustment component located at the top of the first strut is connected to the support plate for adjusting the tilt angle of the support plate; the angle adjustment component includes two U-shaped plates, both of which are detachably connected to the first strut, one of which... A connecting rod is hinged to one side of the U-shaped plate, and a limiting rod is fixedly connected to the other U-shaped plate. A strip groove is opened on the side wall of the connecting rod, and the limiting rod is slidably connected to the strip groove. A mating plate is hinged to the end of the connecting rod away from the U-shaped plate. Two fixing blocks are fixedly connected to one side of the connecting rod. A first screw is rotatably connected between the sides of the two fixing blocks that are close to each other. A first slider is threaded to the outside of the first screw. The first slider is slidably connected to the connecting rod. A second support rod is hinged to the side of the first slider away from the connecting rod. The end of the second support rod away from the first slider is hinged to the mating plate.

[0008] By adopting the above technical solution, angle adjustment components are installed at both ends of the first support rod, and connected to the base and support plate respectively. These angle adjustment components allow for angle adjustment and fixation at a specific angle, enabling adjustments as needed for top or side formwork during actual use. Specifically, when used as top formwork, the lower angle adjustment component is adjusted until the adapter rods on both components are perpendicular to the ground, making the first support rod perpendicular to the ground as well. The upper angle adjustment component is then adjusted to make the support plate parallel to the ground, allowing the structure to support structures such as roofs (providing vertical support). When used as side formwork (such as walls), the two angle adjustment components are coordinated to tilt the first support rod while keeping the support plate perpendicular to the ground, providing support for vertical concrete formwork and achieving multi-purpose functionality.

[0009] A further improvement of the present invention is that: a mounting block is fixedly connected to one side of the U-shaped plate, a second screw is rotatably connected to the mounting block, a number of through holes are equidistantly spaced along the axial direction on the side wall of the support rod, the second screw passes through the through holes, and nuts are threadedly connected to the outside of the second screw and on both sides of the first support rod.

[0010] Using the above technical solution, by fixing the U-shaped plate to the first support rod using the second screw and two nuts, the extension length of the second screw on both sides of the first support rod can be adjusted by the two nuts, thereby controlling the angle between the adapter rod and the first support rod. Referring to the figure, in the upper angle adjustment assembly, the upper U-shaped plate is offset to the left relative to the lower U-shaped plate (left side of the plan view) and is fixed with two nuts. The adapter rod is pushed and tilted by the limiting rod, and the strip groove is repositioned. Through the above adjustment, the angle adjustment can be optimized, making the angle adjustment range wider.

[0011] A further improvement of the present invention is that the first support rod includes a hollow rod and a core rod, the core rod is movably inserted into the hollow rod and fixed by bolts, and the first support rod is composed of different numbers of hollow rods and core rods in an alternating combination to form the required length.

[0012] Using the above technical solution, the first support rod is set as a modular structure assembled from hollow rods and core rods. The outer shape of the core rod matches the inner shape of the hollow rod, and both have several through holes equidistantly opened along the axial direction on their outer surfaces. A suitable number of core rods and hollow rods are selected according to the required length of the first support rod, with the difference between the two numbers not exceeding one. They are arranged in an interlocking manner, interlocked with each other, and fixed with bolts. The length can be quickly adjusted by aligning the different holes of the two. After adjustment, it is necessary to ensure that the difference between the distance to the target length is not greater than the distance between two through holes. The state to be achieved during adjustment is: when it is less than the target length, it will be greater than the target length when it is extended by one hole. After completing the above adjustment, a final fine adjustment is made using the height adjustment component.

[0013] A further improvement of the present invention is that the height adjustment component includes a scissor jack, the top of which is connected to the bottom of the docking plate by bolts, and the bottom of which is connected to the base by bolts.

[0014] Using the above technical solution, after coarsely adjusting the length of the first support rod, the distance between the connecting plate and the base, i.e. the height of the top of the first support rod from the bottom surface, can be precisely adjusted by rotating the screw of the scissor jack until the support plate is pressed against the concrete formwork.

[0015] A further improvement of this utility model is that: four mounting holes are provided on the support plate, the mounting holes are used to install clamps, and the clamps are used to hold the sleepers on the concrete formwork.

[0016] Using the above technical solution, when supporting the side formwork, it is necessary to support the sleepers of the formwork. Therefore, mounting holes for installing clamps are opened on the support plate. When in use, the sleepers can be fixed by the clamps to support the side formwork.

[0017] A further improvement of this utility model is that it also includes a crossbeam for connecting two adjacent and independent first struts, and the crossbeam is installed on the through hole by bolts.

[0018] The above technical solution requires multiple support structures to work together in the support system. By setting crossbeams between each independent support structure and connecting the crossbeams to the through holes, the independent support structures can restrain each other, thereby improving the stability of the support.

[0019] A further improvement of this utility model is that it also includes an extension plate, which is bolted to one of the through holes of the first support rod. The screw rod on the scissor jack is externally threaded with a screw sleeve, and two pivot pins are symmetrically fixed to the outside of the screw sleeve. Two reinforcing rods are hinged to the side of the extension plate away from the first support rod by a half-threaded bolt. The bottom end of the reinforcing rod is provided with an insertion hole, and the pivot pin is inserted into the insertion hole.

[0020] When the above technical solution is adopted, the force is fully applied to the first support rod when supporting the side formwork. In order to improve the stability of the side formwork support, an extension plate is installed on the through hole of the first support rod, and a reinforcing rod is installed between the extension plate and the threaded sleeve to provide reinforced support and improve the stability of the support.

[0021] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0022] 1. This utility model provides a concrete formwork support system. By setting angle adjustment components at both ends of the first support rod and connecting them to the base and support plate respectively, the angle adjustment components can adjust the angle and keep it fixed at a certain angle. Thus, in actual use, it can be adjusted according to the need to use it as a top formwork or a side formwork. When it is needed as a top formwork, the support plate is made parallel to the ground, and the structure is used to support structures such as roofs. When it is needed as a side formwork, the first support rod is tilted, and the support plate is perpendicular to the ground, so as to provide support for vertical concrete formwork, realizing multiple uses in one unit.

[0023] 2. This utility model provides a concrete formwork support system. The first support rod is set as a modular structure assembled from hollow rods and core rods. The outer shape of the core rod matches the inner shape of the hollow rod, and both have several through holes equidistantly opened along the axial direction on their outer surfaces. A suitable number of core rods and hollow rods are selected according to the required length of the first support rod, with the difference between the two numbers not exceeding one. They are arranged in an interlocking manner, interlocked with each other, and fixed with bolts. The length can be quickly adjusted by aligning the different holes. After adjustment, it is necessary to ensure that the difference between the distance to the target length is not greater than the distance between two through holes. The state to be achieved during adjustment is: when it is less than the target length, it will be greater than the target length when it is extended by one hole. After completing the above adjustment, a final fine adjustment is made using a height adjustment component.

[0024] 3. This utility model provides a concrete formwork support system. By setting up crossbeams, which can be installed on through holes to connect the individual units, the independent support structures can restrain each other, thereby improving the stability of the support. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the single-unit structure of the present invention in the state of supporting the top mold;

[0027] Figure 2 This is a schematic diagram of the single-unit structure of the present invention in the side mold support state;

[0028] Figure 3 This is a structural schematic diagram of the top mold assembly support state of this utility model;

[0029] Figure 4 This is a structural schematic diagram of the side mold assembly support state of this utility model;

[0030] Figure 5 This is a schematic diagram of the disassembled structure of this utility model;

[0031] Figure 6 This is a schematic diagram of the angle adjustment component of this utility model in two different angle states (the left docking plate is parallel to the ground, and the right docking plate is perpendicular to the ground).

[0032] Figure 7 This is a schematic diagram showing the disassembled structure of the hollow rod and the core rod of this utility model;

[0033] Figure 8 This utility model Figure 6 Enlarged view of point A in the middle.

[0034] In the diagram: 1. First support rod; 101. Hollow rod; 102. Core rod; 103. Through hole; 2. Base; 3. Support plate; 4. Angle adjustment assembly; 401. Connecting plate; 402. Adapter rod; 403. Second support rod; 404. Fixing block; 405. First screw; 406. First slider; 411. U-shaped plate; 412. Mounting block; 413. Second screw; 414. Strip groove; 415. Limiting rod; 5. Height adjustment assembly; 601. Reinforcing rod; 602. Extension plate; 603. Screw sleeve; 604. Turning pin; 7. Crossbeam. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to embodiments:

[0036] Example 1

[0037] like Figure 1 , Figure 6 and Figure 8As shown, this utility model provides a concrete formwork support system, including a base 2, a first support rod 1, and a support plate 3; it also includes: a height adjustment component 5, installed on the top of the base 2, for fine-tuning the height of the support plate 3; an angle adjustment component 4, installed at both ends of the first support rod 1; the angle adjustment component 4 located at the bottom of the first support rod 1 is connected to the height adjustment component 5, for adjusting the tilt angle of the first support rod 1, and the angle adjustment component 4 located at the top of the first support rod 1 is connected to the support plate 3, for adjusting the tilt angle of the support plate 3; the angle adjustment component 4 includes two U-shaped plates 411, both U-shaped plates 411 are detachably connected to the first support rod 1, and one side of one U-shaped plate 411 is hinged to a transition rod 402, the other... A limiting rod 415 is fixedly connected to a U-shaped plate 411. A strip groove 414 is provided on the side wall of the adapter rod 402. The limiting rod 415 is slidably connected to the strip groove 414. A docking plate 401 is hinged to the end of the adapter rod 402 away from the U-shaped plate 411. Two fixing blocks 404 are fixedly connected to one side of the adapter rod 402. A first screw 405 is rotatably connected between the two fixing blocks 404 on the side that is close to each other. A first slider 406 is threadedly connected to the outside of the first screw 405. The first slider 406 is slidably connected to the adapter rod 402. A second support rod 403 is hinged to the side of the first slider 406 away from the adapter rod 402. The end of the second support rod 403 away from the first slider 406 is hinged to the docking plate 401.

[0038] In this embodiment, by setting angle adjustment components 4 at both ends of the first support rod 1 and connecting them to the base 2 and the support plate 3 respectively, the angle adjustment components 4 can adjust the angle and maintain it at a fixed angle. This allows for adjustment during actual use as a top or side formwork. Specifically, when used as a top formwork, the lower angle adjustment component 4 is adjusted so that the adapter rods 402 on both angle adjustment components 4 are perpendicular to the ground, making the first support rod 1 perpendicular to the ground as well. The upper angle adjustment component 4 is then adjusted so that the support plate 3 is parallel to the ground, allowing the structure to support structures such as roofs (providing vertical support). When used as a side formwork (such as a wall), the two angle adjustment components 4 are coordinated to tilt the first support rod 1 while keeping the support plate 3 perpendicular to the ground, providing support for the vertical concrete formwork and achieving multiple uses in one unit.

[0039] The specific adjustment method is as follows: one end of the first screw 405 extends to the other side of the fixed block 404 and is fixedly connected to a screw head. By rotating the screw head, the first screw 405 is rotated, which drives the first slider 406 to slide on the adapter rod 402. Since the first slider 406 is hinged to the second support rod 403 and slidably connected to the adapter rod 402, and the adapter rod 402 is hinged to the docking plate 401, and the docking plate 401 is hinged to the second support rod 403, the above two hinge points and the first slider 406 (three points) together form a triangular structure, which can provide stable support when the slider is not moving, and the angle of the adapter rod 402 can be adjusted by adjusting the position of the first slider 406. The base 2 is fixed to the ground by ground stakes.

[0040] Example 2

[0041] like Figure 1 , Figure 2 and Figure 5 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, a mounting block 412 is fixedly connected to one side of the U-shaped plate 411, and a second screw 413 is rotatably connected to the mounting block 412. The side wall of the support rod has several through holes 103 at equal intervals along the axial direction. The second screw 413 passes through the through holes 103, and nuts are threadedly connected to the outside of the second screw 413 and on both sides of the first support rod 1.

[0042] The above adjustment process relies on the sliding of the first slider 406 to achieve adjustment. Since the angle between the docking plate 401 and the adapter rod 402 in the above scheme is adjusted by the sliding of the first slider 406 on the adapter rod 402, if a larger angle adjustment is required, the length of the adapter rod 402 must be increased, which increases the lever arm, thereby reducing the stability of the support and limiting the adjustable range.

[0043] In this embodiment, by fixing the U-shaped plate 411 to the first support rod 1 using the second screw 413 and two nuts, the extension length of the second screw 413 on both sides of the first support rod 1 can be adjusted by the two nuts, thereby controlling the angle between the adapter rod 402 and the first support rod 1. (Refer to...) Figure 5 In the upper angle adjustment component 4, the upper U-shaped plate 411 is offset to the left relative to the lower U-shaped plate 411 (left side of the plan view in this figure) and is fixed with two nuts. The adapter rod 402 is pushed and tilted by the limiting rod 415. The strip groove 414 makes way. Through the above adjustment, the angle adjustment can be optimized, so that the angle adjustment range is wider.

[0044] Example 3

[0045] like Figure 1 , Figure 2 and Figure 7As shown, based on Embodiment 2, this utility model provides a technical solution: preferably, the first support rod 1 includes a hollow rod 101 and a core rod 102, the core rod 102 is movably inserted into the hollow rod 101 and fixed by bolts, and the first support rod 1 is formed by alternating combinations of different numbers of hollow rods 101 and core rods 102 to the required length.

[0046] Due to practical needs, the supported templates have different heights (such as the top formwork being affected by the floor height), making it necessary to adjust the length of the first support rod 1. Although there are existing technical solutions to meet these requirements, traditional techniques typically rely entirely on screw adjustment. Due to the influence of the screw's helix angle, the screw needs to rotate multiple times to drive the support rod (the first support rod 1 in this solution) to extend or retract a small amount of length. Furthermore, to ensure support stability, it is inconvenient to improve the screw's helix angle (increasing the helix angle can cause the screw to rotate under pressure, i.e., it cannot self-lock). Therefore, this results in a large workload for adjusting the support rod length.

[0047] In this embodiment, the first support rod 1 is configured as a modular structure assembled from a hollow rod 101 and a core rod 102. The outer shape of the core rod 102 matches the inner shape of the hollow rod 101, and both have several through holes 103 equidistantly opened along the axial direction on their outer surfaces. A suitable number of core rods 102 and hollow rods 101 are selected according to the required length of the first support rod 1, with the difference between the two numbers not exceeding one. They are arranged in an interlocking manner, interlocked with each other, and fixed with bolts. The length can be quickly adjusted by aligning the different hole positions of the two. After adjustment, it is necessary to ensure that the difference between the distance to the target length is not greater than the distance between two through holes 103. The state to be achieved during adjustment is: less than the target length, and when extended by one hole position, it will be greater than the target length. After completing the above adjustment, the height adjustment component 5 is used to make a final fine adjustment.

[0048] like Figure 3 , Figure 4 and Figure 5 As shown, preferably, the height adjustment assembly 5 includes a scissor jack, the top of which is bolted to the bottom of the docking plate 401, and the bottom of which is bolted to the base 2.

[0049] In this embodiment, after the coarse adjustment of the length of the first support rod 1 is completed using the above scheme, the distance between the docking plate 401 and the base 2 can be precisely adjusted by rotating the screw of the scissor jack, that is, the height of the top of the first support rod 1 from the bottom surface, until the support plate 3 is pressed against the concrete formwork.

[0050] like Figure 2 and Figure 4 As shown, preferably, the support plate 3 has four mounting holes for mounting clamps, which are used to hold the sleepers on the concrete formwork.

[0051] In this embodiment, when supporting the side mold, it is necessary to support the sleepers of the template. Therefore, mounting holes for installing clamps are opened on the support plate 3. When in use, the sleepers can be fixed by the clamps to support the side mold.

[0052] like Figure 3 and Figure 4 As shown, preferably, it also includes a crossbeam 7 for connecting two adjacent and independent first struts 1, and the crossbeam 7 is bolted to the through hole 103.

[0053] In this embodiment, the support system requires multiple support structures to work together. By setting a crossbeam 7 between each independent support structure and connecting the crossbeam 7 to the through hole 103, the independent support structures can restrain each other, thereby improving the stability of the support.

[0054] like Figure 2 , Figure 4 and Figure 5 As shown, preferably, it also includes an extension plate 602, which is bolted to one of the through holes 103 of the first support rod 1. The screw rod on the scissor jack is externally threaded with a screw sleeve 603. Two pivot pins 604 are symmetrically fixed to the outside of the screw sleeve 603. Two reinforcing rods 601 are hinged to the side of the extension plate 602 away from the first support rod 1 by a half-threaded bolt. The bottom end of the reinforcing rod 601 is provided with an insertion hole, and the pivot pin 604 is inserted into the insertion hole.

[0055] In this embodiment, when supporting the side template, the force is entirely applied to the first support rod 1. To improve the stability of the side template support, an extension plate 602 is installed on the through hole 103 on the first support rod 1, and a reinforcing rod 601 is installed between the extension plate 602 and the threaded sleeve 603 to provide reinforced support and improve the stability of the support.

[0056] The working principle of this concrete formwork support system will be explained in detail below.

[0057] like Figures 1-8 As shown, the top formwork is supported by adjusting the lower angle adjustment component 4 so that the adapter rods 402 on both angle adjustment components 4 are perpendicular to the ground, so that the first support rod 1 is also perpendicular to the ground; and adjusting the upper angle adjustment component 4 so that the support plate 3 is parallel to the ground, so that the structure can be used to support structures such as roofs (providing vertical support).

[0058] Supporting the side formwork: By coordinating the two angle adjustment components 4 at the top and bottom, the first support rod 1 is tilted, and the support plate 3 is perpendicular to the ground, thus providing support for the vertical concrete formwork.

[0059] The adjustment method of the angle adjustment component 4 is as follows: by rotating the screw head, the first screw 405 is rotated, which drives the first slider 406 to slide on the adapter rod 402. Since the first slider 406 is hinged to the second support rod 403 and slidably connected to the adapter rod 402, and the adapter rod 402 is hinged to the docking plate 401, and the docking plate 401 is hinged to the second support rod 403, the above two hinge points and the first slider 406 (three points) together form a triangular structure, which can provide stable support when the slider is not moving, and the angle of the adapter rod 402 can be adjusted by adjusting the position of the first slider 406.

[0060] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A concrete formwork support system, comprising a base (2), a first strut (1), and a support plate (3); characterized in that, Also includes: The height adjustment component (5) is installed on the top of the base (2) and is used to fine adjust the height of the support plate (3); Angle adjustment components (4) are installed at both ends of the first strut (1); An angle adjustment component (4) located at the bottom of the first support rod (1) is connected to a height adjustment component (5) for adjusting the tilt angle of the first support rod (1). An angle adjustment component (4) located at the top of the first support rod (1) is connected to a support plate (3) for adjusting the tilt angle of the support plate (3). The angle adjustment assembly (4) includes two U-shaped plates (411), both of which are detachably connected to the first support rod (1). One side of one of the U-shaped plates (411) is hinged to a transition rod (402), and a limit rod (415) is fixedly connected to the other U-shaped plate (411). A strip groove (414) is provided on the side wall of the transition rod (402), and the limit rod (415) is slidably connected to the strip groove (414). A mating plate (401) is hinged to the end of the transition rod (402) away from the U-shaped plate (411). Two fixing blocks (404) are fixedly connected to one side of the adapter rod (402). A first screw (405) is rotatably connected between the two fixing blocks (404) on the side that is close to each other. A first slider (406) is connected to the external thread of the first screw (405). The first slider (406) is slidably connected to the adapter rod (402). A second support rod (403) is hinged to the side of the first slider (406) away from the adapter rod (402). The end of the second support rod (403) away from the first slider (406) is hinged to the docking plate (401).

2. The concrete formwork support system according to claim 1, characterized in that: A mounting block (412) is fixedly connected to one side of the U-shaped plate (411). A second screw (413) is rotatably connected to the mounting block (412). Several through holes (103) are equidistantly spaced along the axial direction on the side wall of the first support rod (1). The second screw (413) passes through the through holes (103). Nuts are threadedly connected to the outside of the second screw (413) and on both sides of the first support rod (1).

3. A concrete formwork support system according to claim 2, characterized in that: The first support rod (1) includes a hollow rod (101) and a core rod (102). The core rod (102) is movably inserted into the hollow rod (101) and fixed by bolts. The first support rod (1) is formed by alternating combinations of different numbers of hollow rods (101) and core rods (102) to the required length.

4. A concrete formwork support system according to claim 3, characterized in that: The height adjustment assembly (5) includes a scissor jack, the top of which is bolted to the bottom of the docking plate (401), and the bottom of which is bolted to the base (2).

5. A concrete formwork support system according to claim 4, characterized in that: The support plate (3) has four mounting holes for installing clamps, which are used to hold sleepers on the concrete formwork.

6. A concrete formwork support system according to claim 5, characterized in that: It also includes a crossbeam (7) for connecting two adjacent and independent first struts (1), the crossbeam (7) being bolted onto the through hole (103).

7. A concrete formwork support system according to claim 6, characterized in that: It also includes an extension plate (602), which is bolted to one of the through holes (103) of the first support rod (1). The screw on the scissor jack is externally threaded with a screw sleeve (603). Two pivot pins (604) are symmetrically fixed to the outside of the screw sleeve (603). Two reinforcing rods (601) are hinged to the side of the extension plate (602) away from the first support rod (1) by a half-threaded bolt. The bottom end of the reinforcing rod (601) is provided with an insertion hole, and the pivot pin (604) is inserted into the insertion hole.

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