Liftable supporting device and lifting method

Abstract

The invention belongs to the technical field of lifting devices, and discloses a liftable supporting device and a lifting method. The liftable supporting device comprises a lifting mechanism, a supporting assembly, a locking assembly and a driving piece. The lifting mechanism comprises two lifting assemblies, each lifting assembly comprises a connecting piece and a lifting piece arranged on the connecting piece, and each lifting piece comprises a first connecting rod and a second connecting rod which are hinged to each other; the supporting assembly comprises a base and a jacking piece, the base is used for being connected with the bottom supporting piece, and the jacking piece is used for supporting a construction building; the locking assembly comprises a screw rod and a plurality of nuts, and the nuts are distributed at the two ends of the screw rod and can lock the two lifting assemblies. The driving part can extend to drive the two lifting assemblies to get close to each other so that the jacking part can ascend. The liftable supporting device provided by the invention can be lifted to different heights to support a construction building, and has good supporting stability. According to the lifting method, multi-stage adjustment of the supporting height of the lifting supporting device can be achieved, and the precision of the supporting height is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting devices, and in particular, to a liftable support device and a lifting method. Background Art

[0002] In the field of construction, temporary support devices, as key support structures, directly affect construction safety and efficiency with their performance. Currently, the commonly used temporary support devices mainly include the following: First, sand cylinders, which adjust the support height by the amount of sand filling, are applicable to large-scale projects such as bridges. However, the sand is prone to settlement, resulting in low accuracy of the support height. Second, reinforced concrete support devices have good support effects, but they have a long production cycle, are difficult to disassemble, and cannot be reused. Third, steel support devices have high strength and are easy to install, but the support height is fixed and cannot be adjusted. Fourth, hydraulic support devices are applicable to complex working conditions such as bridge jacking, but they have poor environmental adaptability, high maintenance technical requirements, and high construction costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a liftable support device and a lifting method, which can accurately adjust the support height and improve the support stability for large loads.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A liftable support device, which includes:

[0006] A lifting mechanism, including two sets of lifting components arranged oppositely along a first direction. The lifting component includes a connecting piece and a lifting member arranged on the connecting piece. The lifting member includes a first connecting rod and a second connecting rod that are hinged to each other.

[0007] A support component, including a base and a jacking member. The base is used to connect the bottom support member. The bottom end of the second connecting rod is hinged to the base, and the top end of the first connecting rod is hinged to the jacking member. The jacking member is used to support the construction building.

[0008] A locking component, including a screw rod extending along the first direction and a plurality of nuts. The screw rod is arranged on two of the connecting pieces, and the nuts are distributed at both ends of the screw rod and can lock the two sets of lifting components.

[0009] A driving member is arranged on the screw rod and between the nut and the connecting piece. The driving member can extend to drive the two sets of lifting components to approach each other. When the two sets of lifting components approach each other, the jacking member rises.

[0010] In the above liftable support device, the connecting piece extends along a second direction, and the second direction is perpendicular to the first direction. At least two lifting members are arranged on each connecting piece.

[0011] The above-mentioned liftable support device, wherein the connecting member is connected to the first link; or, the connecting member is connected to the second link; or, the lifting assembly further includes a third link, and the connecting member and the lifting member are connected through the third link.

[0012] The above-mentioned liftable support device, wherein one end of the third link is fixedly connected to the connecting member, the other end of the third link is hinged to the lifting member, and the first link, the second link and the third link share a hinge shaft.

[0013] The above-mentioned liftable support device, wherein two third links are provided corresponding to each lifting member, and the two third links are spaced along the second direction and connected to both sides of the lifting member.

[0014] The above-mentioned liftable support device, wherein the locking assembly includes a plurality of screws, the plurality of screws are spaced along the second direction, and each screw is sleeved with a driving member, and the driving members move synchronously.

[0015] The above-mentioned liftable support device, wherein the driving member is a through-hole jack.

[0016] The above-mentioned liftable support device, wherein the jacking member includes a top plate and a side plate fixedly connected, the top plate is arranged at the top of the side plate, the top plate is used to support the construction building, and the side plate is hinged to the first link.

[0017] The above-mentioned liftable support device, wherein the top plate includes a jacking plane, and a buffer layer is arranged on the jacking plane.

[0018] A lifting method, using the above-mentioned liftable support device, which includes:

[0019] S1: Install the liftable support device on the bottom support member;

[0020] S2: Tighten the nut close to the driving member, the driving member extends and pushes against the nut and the connecting member, so that the two sets of lifting assemblies approach each other, driving the jacking member to rise;

[0021] S3: After the driving member extends to the maximum stroke, tighten the nut away from the driving member to lock the lifting assembly, adjust the driving member to the shortened state, tighten the nut close to the driving member, so that the driving member is pressed tightly between the nut and the connecting member, the driving member extends and pushes against the nut and the connecting member, so that the two sets of lifting assemblies approach each other, driving the jacking member to rise;

[0022] S4: Repeat step S3 until the jacking member reaches the set height.

[0023] Advantages of the present invention:

[0024] The liftable support device provided by the present invention, when in use, connects the base to the bottom support member to provide a support function. The positional relationship among the nut, the driving member, and the connecting member can be adjusted multiple times. By extending the driving member to push against the nut and the connecting member, the two sets of lifting components move towards each other, driving the jacking member to rise. After reaching the set height position, the nut is adjusted to lock the two sets of lifting components to prevent them from descending, thereby improving the support stability. The liftable support device provided by the present invention can be lifted to different heights to support a construction building and has good support stability.

[0025] For the lifting method provided by the present invention, after the driving member extends to its maximum stroke, first, tighten the nut far from the driving member to lock the lifting component, adjust the driving member to the shortened state, and then, tighten the nut close to the driving member so that the driving member is tightly pressed between the nut and the connecting member. The driving member extends to push against the nut and the connecting member, and the two sets of lifting components approach each other, driving the jacking member to rise. The lifting method provided by the present invention can achieve multi-stage adjustment of the support height of the liftable support device, improving the accuracy of the support height. Moreover, by adjusting with a driving member with a small stroke, the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the liftable support device provided by an embodiment of the present invention;

[0027] Figure 2 is a first schematic diagram of the cooperation of the lifting mechanism, the locking component, and the driving component provided by an embodiment of the present invention;

[0028] Figure 3 is a second schematic diagram of the cooperation of the lifting mechanism, the locking component, and the driving component provided by an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Lifting mechanism; 11. Lifting component; 111. Connecting member; 112. Lifting member; 1121. First connecting rod; 1122. Second connecting rod; 113. Third connecting rod;

[0031] 2. Support component; 21. Base; 22. Jacking member; 221. Top plate; 222. Side plate;

[0032] 3. Locking component; 31. Screw rod; 32. Nut;

[0033] 4. Driving member;

[0034] 5. Hinge shaft;

[0035] 6. Cross beam;

[0036] 100. Bottom support member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of the present invention, unless otherwise clearly defined and limited, the "above" or "below" of the first feature with respect to the second feature may include direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the "above", "above", and "on" of the first feature with respect to the second feature include that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below", and "under" of the first feature with respect to the second feature include that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0040] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] The present invention provides a liftable support device and a lifting method, which can accurately adjust the support height and improve the support stability for large loads.

[0042] As Figures 1 to 3As shown, the liftable support device includes a lifting mechanism 1, a support assembly 2, a locking assembly 3, and a driving member 4. The lifting mechanism 1 includes two sets of lifting components 11 arranged oppositely in the first direction. The lifting component 11 includes a connecting member 111 and a lifting member 112 provided on the connecting member 111. The lifting member 112 includes a first connecting rod 1121 and a second connecting rod 1122 that are hinged to each other; the support assembly 2 includes a base 21 and a jacking member 22. The base 21 is used to connect to the bottom support member 100. The bottom end of the second connecting rod 1122 is hinged to the base 21, and the top end of the first connecting rod 1121 is hinged to the jacking member 22. The jacking member 22 is used to support the construction building; the locking assembly 3 includes a screw rod 31 extending in the first direction and a plurality of nuts 32. The screw rod 31 is provided on the two connecting members 111, and the nuts 32 are distributed at both ends of the screw rod 31 and can lock the two sets of lifting components 11; the driving member 4 is provided on the screw rod 31 and between the nut 32 and the connecting member 111. The driving member 4 can extend to drive the two sets of lifting components 11 to approach each other. When the two sets of lifting components 11 approach each other, the jacking member 22 rises.

[0043] For the liftable support device provided by the present invention, during use, the base 21 is connected to the bottom support member 100 to provide a supporting effect. The positional relationship among the nut 32, the driving member 4, and the connecting member 111 can be adjusted multiple times. By extending the driving member 4 to push against the nut 32 and the connecting member 111, the two sets of lifting components 11 move towards each other, driving the jacking member 22 to rise. After reaching the set height position, the nut 32 is adjusted to lock the two sets of lifting components 11 to prevent descent and improve the supporting stability. The liftable support device provided by the present invention can be lifted to different heights to support the construction building and has good supporting stability.

[0044] In this embodiment, referring to Figure 2 and Figure 3 , the first connecting rod 1121 and the second connecting rod 1122 are hinged in a checkmark shape to form the lifting member 112. The two sets of lifting members 112 are connected to the connecting member 111 to form the lifting component 11. The two sets of lifting components 11 are hinged to the base 21 and the jacking member 22 to form a rhombus-shaped lifting mechanism 1. When the two sets of lifting components 11 approach each other, the angle between the first connecting rod 1121 and the second connecting rod 1122 of each lifting member 112 becomes larger, and the lifting mechanism 1 rises; when the two sets of lifting components 11 move away from each other, the angle between the first connecting rod 1121 and the second connecting rod 1122 of each lifting member 112 becomes smaller, and the lifting mechanism 1 descends. In other embodiments, the lifting mechanism 1 can also be a parallelogram structure, which has good stability.

[0045] The connecting member 111 is used to connect the lifting member 112. Exemplarily, the connecting member 111 extends in the second direction, and the second direction is perpendicular to the first direction. At least two lifting members 112 are provided on each connecting member 111 to improve the stability of the lifting process. The first direction is asFigure 1 As shown in the X direction, the second direction is as Figure 1 shown in the Y direction.

[0046] Optionally, referring to Figure 1 , two lifting members 112 are provided on each connecting member 111, which is convenient for installation. In other embodiments, three or more lifting members 112 may also be provided on each connecting member 111 to improve the lifting stability.

[0047] In this embodiment, the shape of the connecting member 111 is not specifically limited. Exemplarily, the connecting member 111 is rod-shaped, which is simple to process and convenient for connection. The connecting member 111 can be a square rod or a round rod. In this embodiment, referring to Figure 2 and Figure 3 , the connecting member 111 is a square rod, which can avoid torsion and improve stability.

[0048] The connecting member 111 is connected to the first connecting rod 1121; or, the connecting member 111 is connected to the second connecting rod 1122; or, the lifting assembly 11 further includes a third connecting rod 113, and the connecting member 111 is connected to the lifting member 112 through the third connecting rod 113. The driving member 4 applies a force to the connecting member 111, and the two connecting members 111 move towards each other, so that the angle between the first connecting rod 1121 and the second connecting rod 1122 of each connecting member 111 becomes larger, and the lifting member 112 rises, driving the jacking member 22 to rise.

[0049] Optionally, when the connecting member 111 is connected to the first connecting rod 1121, it can be connected by pin hinge. Optionally, when the connecting member 111 is connected to the second connecting rod 1122, it can be connected by pin hinge.

[0050] In this embodiment, the connecting member 111 is connected to the lifting member 112 through the third connecting rod 113. Specifically, one end of the third connecting rod 113 is fixedly connected to the connecting member 111, and the other end of the third connecting rod 113 is hinged to the lifting member 112. The first connecting rod 1121, the second connecting rod 1122 and the third connecting rod 113 share a hinge shaft 5. The structure is simple and the cost is reduced. The driving member 4 applies a force to the connecting member 111, and the connecting member 111 moves under the force to push the hinge shaft 5. The hinge shaft 5 drives the first connecting rod 1121 and the second connecting rod 1122 to move, so that the first connecting rod 1121 and the second connecting rod 1122 rotate relative to each other, changing the angle between the first connecting rod 1121 and the second connecting rod 1122, and realizing the rise or fall of the lifting mechanism 1.

[0051] It should be noted that the shapes of the first connecting rod 1121, the second connecting rod 1122 and the third connecting rod 113 can be rod-shaped or plate-shaped. In this embodiment, referring to Figures 1 to 3, the first link 1121, the second link 1122, and the third link 113 are all plate-shaped, which is convenient for processing hinge holes and easy to install.

[0052] The third link 113 is used to connect the lifting member 112 and the connecting member 111. In this embodiment, the number of the third links 113 is not specifically limited. Optionally, two third links 113 are provided corresponding to each lifting member 112, and the two third links 113 are spaced along the second direction and connected to both sides of the lifting member 112. The two third links 113 are arranged on both sides of the lifting member 112. During the process that the third link 113 drives the first link 1121 and the second link 1122 to rotate relative to each other, the lifting member 112 is more evenly stressed, the lifting process is more stable, and the movement stability is improved.

[0053] The locking assembly 3 is used to lock the lifting mechanism 1. In this embodiment, the locking assembly 3 includes a plurality of screws 31, the plurality of screws 31 are spaced along the second direction, and a driving member 4 is sleeved on each screw 31, and the driving members 4 move synchronously. The movement stability of the lifting mechanism 1 is improved.

[0054] Exemplarily, the locking assembly 3 includes two screws 31, a driving member 4 is sleeved on each screw 31, and nuts 32 are respectively screwed at both ends of the screw 31. For the convenience of description, the nut 32 close to the driving member 4 is the proximal nut, and the nut 32 far from the driving member 4 is the distal nut. The driving member 4 is arranged between the proximal nut and the connecting member 111. When the driving member 4 extends to push the proximal nut and the connecting member 111, since the nut 32 is fixedly connected to the screw 31, the driving member 4 will push the connecting member 111 to move. The connecting member 111 drives the third link 113 to move, and the first link 1121 and the second link 1122 rotate around the hinge shaft 5, and the included angle between the first link 1121 and the second link 1122 becomes larger, and the lifting mechanism 1 rises, driving the jacking member 22 to move upward. The distal nut abuts against the connecting member 111, which can lock the lifting mechanism 1 and improve the support stability.

[0055] In this embodiment, the driving member 4 is a through-hole jack, which has a large driving force, and the through-hole jack can pass through the screw 31, saving installation space. In other embodiments, the driving member 4 can be a hydraulic cylinder, which is easy to obtain.

[0056] The jacking member 22 is used to support the building mechanism. The jacking member 22 can be plate-shaped or block-shaped. In this embodiment, refer to Figure 2 and Figure 3 , the jacking member 22 includes a top plate 221 and a side plate 222. The top plate 221 is arranged at the top end of the side plate 222. The top plate 221 is used to support the construction building, and the side plate 222 is hinged to the first link 1121. The plate-shaped side plate 222 is convenient for opening hinge holes and hinging with the first link 1121.

[0057] Optionally, one lifting member 22 may be provided. The side plate 222 of the lifting member 22 is hinged to the first link 1121 of each lifting member 112, and the structure is simple. Since there is a gap between the lifting members 112, it is necessary for the lifting member 22 to cover all the lifting members 112. Therefore, the lifting member 22 may have a large supporting surface to improve the supporting effect.

[0058] Optionally, a plurality of lifting members 22 are provided, and the number of the lifting members 22 is the same as the number of the lifting members 112 in each set of lifting assemblies 11. Exemplarily, referring to Figure 3 , two lifting members 22 are provided. One of the lifting members 22 is hinged to the lifting members 112 on the same side of two sets of lifting assemblies 11, and the other lifting member 22 is hinged to the remaining two lifting members 112. The two lifting members 22 are fixedly connected by a cross beam 6. After the lifting member 22 is damaged, only the damaged lifting member 22 needs to be replaced, which reduces the cost and improves the maintenance efficiency.

[0059] Specifically, the top plate 221 and the side plate 222 are fixedly connected, and the side plate 222 is provided with a hinge hole for passing through a pin shaft to be hinged to the first link 1121, which is convenient for connection. In this embodiment, referring to Figure 2 , the side plate 222 is provided with two hinge holes, a pin shaft is passed through the hinge holes, and the pin shaft is passed through the first link 1121, so that the first link 1121 and the lifting member 22 are hinged.

[0060] The side plate 222 and the top plate 221 may be connected by bolts or welded. Exemplarily, the side plate 222 and the top plate 221 are welded and fixed, which is convenient for operation and has high connection strength.

[0061] In this embodiment, the top plate 221 includes a lifting plane, and a buffer layer is provided on the lifting plane. The impact of the construction building on the lifting member 22 is reduced. Specifically, the buffer layer may be a rubber pad, which has good elasticity and can effectively absorb the impact, improving the stability of the liftable support device. In other embodiments, the buffer layer may also be a polyurethane sponge, which has low cost.

[0062] The present invention also provides a lifting method, which uses the above liftable support device, including:

[0063] S1: Install the lift support device on the bottom support member 100; S2: Tighten the nut 32 near the drive member 4. The drive member 4 extends and pushes against the nut 32 and the connecting member 111, causing the two sets of lifting components 11 to approach each other and driving the lifting member 22 to rise; S3: After the drive member 4 extends to its maximum stroke, tighten the nut 32 away from the drive member 4 to lock the lifting component 11. Adjust the drive member 4 to the shortened state, then tighten the nut 32 near the drive member 4 so that the drive member 4 is clamped between the nut 32 and the connecting member 111. The drive member 4 extends and pushes against the nut 32 and the connecting member 111, causing the two sets of lifting components 11 to approach each other and driving the lifting member 22 to rise; S4: Repeat step S3 until the lifting member 22 reaches the set height.

[0064] For the lifting method provided by the present invention, after the drive member 4 extends to its maximum stroke, first, tighten the nut 32 away from the drive member 4 to lock the lifting component 11. Adjust the drive member 4 to the shortened state. Then, tighten the nut 32 near the drive member 4 so that the drive member 4 is clamped between the nut 32 and the connecting member 111. Finally, the drive member 4 extends and pushes against the nut 32 and the connecting member 111, and the two sets of lifting components 11 approach each other, driving the lifting member 22 to rise. The lifting method provided by the present invention can achieve multi-stage adjustment of the support height of the lift support device, improving the accuracy of the support height. Moreover, by adjusting with a drive member 4 with a small stroke, the cost is reduced.

[0065] In step S1, the base 21 and the bottom support member 100 can be connected by bolts, which is convenient for connection and has high stability.

[0066] In step S2, the drive member 4 is sleeved on the screw 31, and the proximal nut is tightened so that the drive member 4 abuts against the proximal nut and the connecting member 111, facilitating the pushing of the connecting member 111 to drive the two lifting components 11 to approach each other to lift the lifting mechanism 1.

[0067] In step S3, the stroke of the drive member 4 is short, and the drive member 4 needs to be reset multiple times to increase the lift of the lifting mechanism 1. During the reset process, the distal nut needs to be tightened to prevent the lifting mechanism 1 from descending after the drive member 4 shortens, reducing potential safety hazards and improving support stability.

[0068] After step S4, the distal nut can be loosened to put the drive member 4 in an unloaded state. Due to its own gravity, the lifting mechanism 1 will descend and compress the drive member 4 to land slowly, improving stability. To further improve stability, when the drive member 4 is compressed to the reset state, the distal nut can be tightened, the proximal nut can be loosened to adjust the drive member 4 to the extended state, and then the distal nut can be loosened, and the lifting mechanism 1 will continue to descend.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A liftable support device, characterized in that: include: A lifting mechanism (1) comprises two groups of lifting assemblies (11) arranged opposite to each other along a first direction, the lifting assemblies (11) comprising a connecting member (111) and a lifting member (112) arranged on the connecting member (111), the lifting member (112) comprising a first connecting rod (1121) and a second connecting rod (1122) hinged to each other; A support assembly (2), comprising a base (21) and a lifting member (22), wherein the base (21) is used to connect to a bottom support member (100), the bottom end of the second connecting rod (1122) is hinged to the base (21), the top end of the first connecting rod (1121) is hinged to the lifting member (22), and the lifting member (22) is used to support a construction building; A locking assembly (3), comprising a screw rod (31) extending along the first direction and a plurality of nuts (32), wherein the screw rod (31) is arranged on the two connecting members (111), and the nuts (32) are distributed at both ends of the screw rod (31) and are capable of locking the two sets of lifting assemblies (11); A driving member (4) is arranged on the screw rod (31) and between the nut (32) and the connecting member (111). The driving member (4) can be extended to drive the two groups of lifting assemblies (11) to approach each other. When the two groups of lifting assemblies (11) approach each other, the lifting member (22) rises.

2. The liftable support device according to claim 1, characterized in that: The connecting member (111) extends along a second direction, the second direction is perpendicular to the first direction, and each of the connecting members (111) is provided with at least two lifting members (112).

3. The liftable support device according to claim 1, characterized in that: The connecting member (111) is connected to the first connecting rod (1121); or, the connecting member (111) is connected to the second connecting rod (1122); or, the lifting component (11) further includes a third connecting rod (113), and the connecting member (111) and the lifting member (112) are connected via the third connecting rod (113).

4. The liftable support device according to claim 3, characterized in that: One end of the third connecting rod (113) is fixedly connected to the connecting member (111), and the other end of the third connecting rod (113) is hinged to the lifting member (112); the first connecting rod (1121), the second connecting rod (1122) and the third connecting rod (113) share a hinge axis (5).

5. The liftable support device according to claim 3, characterized in that: Two third connecting rods (113) are provided corresponding to each lifting member (112), and the two third connecting rods (113) are connected to two sides of the lifting member (112) at intervals along the second direction.

6. The liftable support device according to claim 1, characterized in that: The locking assembly (3) comprises a plurality of screw rods (31), the plurality of screw rods (31) are arranged at intervals along the second direction, each screw rod (31) is sleeved with a driving member (4), and each driving member (4) moves synchronously.

7. The liftable support device according to claim 1, characterized in that: The driving member (4) is a through-hole jack.

8. The liftable support device according to any one of claims 1 to 7, characterized in that: The lifting member (22) comprises a top plate (221) and a side plate (222) which are fixedly connected, wherein the top plate (221) is arranged at the top end of the side plate (222), the top plate (221) is used to support the construction building, and the side plate (222) is hinged to the first connecting rod (1121).

9. The liftable support device according to claim 8, characterized in that: The top plate (221) comprises a lifting plane, and a buffer layer is arranged on the lifting plane.

10. A lifting method, using the liftable support device according to any one of claims 1 to 9, characterized in that: include: S1: Installing the liftable support device on the bottom support member (100); S2: Tighten the nut (32) close to the driving member (4), so that the driving member (4) extends to push against the nut (32) and the connecting member (111), so that the two sets of lifting components (11) are close to each other, driving the lifting member (22) to rise; S3: After the driving member (4) is extended to the maximum stroke, the nut (32) away from the driving member (4) is tightened to lock the lifting assembly (11), the driving member (4) is adjusted to a shortened state, and the nut (32) close to the driving member (4) is tightened so that the driving member (4) is pressed against between the nut (32) and the connecting member (111), and the driving member (4) is extended to push against the nut (32) and the connecting member (111), so that the two sets of lifting assemblies (11) are moved closer to each other, driving the lifting member (22) to rise; S4: Repeat step S3 until the lifting member (22) reaches the set height.

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