A liftable scaffold

Abstract

The present application relates to a kind of liftable scaffold, including operating platform and the scaffold assembly for supporting operating platform, scaffold assembly includes the support frame being respectively arranged in the both sides of operating platform and the adjusting mechanism installed on support frame, operating platform is provided with the lifting sliding sleeve of sliding sleeve in support frame, adjusting mechanism includes limiting assembly and lifting assembly, limiting assembly is used to lock lifting sliding sleeve on support frame, lifting assembly is connected with operating platform and can drive operating platform to lift, the purpose of the present application is to provide a kind of liftable scaffold, to solve the technical problems that the unlocking state of existing liftable scaffold cannot be kept, lifting is laborious, hole position is difficult to align.

Description

Technical Field

[0001] This invention belongs to the technical field of construction auxiliary equipment, and in particular relates to a liftable scaffold. Background Technology

[0002] Scaffolding is an indispensable auxiliary tool on construction sites such as building and decoration sites. Existing small lifting scaffolding, such as the Chinese utility model patent with publication number "CN207761264U", discloses a lifting scaffolding, which includes a platform, a horizontal frame and a leg assembly. It mainly adjusts the height of the operating platform by sliding the lifting sleeve along the leg pole and uses a pin-type component for positioning.

[0003] However, the above-mentioned lifting scaffolding structure has the following technical problems in actual use. First, the unlocked state of the latch cannot be maintained. When adjusting the height, the operator needs to continuously pull the latch assembly outward by hand to keep it in the position of exiting the positioning hole, while also freeing up his hand to raise or lower the platform. This is inconvenient, and if the latch is not careful, it will spring back and jam, causing the adjustment to be interrupted. Second, the lifting operation is laborious. Due to the weight of the platform itself plus the possible weight of the materials, relying entirely on manual labor to lift or lower it is labor-intensive, and it is difficult to accurately control the displacement during the lifting process, which increases the difficulty of adjustment. Finally, it is difficult to align the holes after lifting or lowering. When the platform is raised or lowered to near the target height, the connecting hole on the lifting sleeve and the positioning hole on the leg are often misaligned. It is necessary to repeatedly fine-tune the position of the platform to align them and insert the latch. The whole process is both time-consuming and laborious. Summary of the Invention

[0004] The purpose of this invention is to provide a liftable scaffold to solve the technical problems of existing liftable scaffolds, such as the inability to maintain the unlocked state, the difficulty in lifting, and the difficulty in aligning the holes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a liftable scaffold, comprising an operating platform and a scaffold assembly for supporting the operating platform. The scaffold assembly includes support frames respectively disposed on both sides of the operating platform and an adjustment mechanism mounted on the support frames. The operating platform is provided with a lifting sleeve that is slidably fitted onto the support frames. The adjustment mechanism includes a limiting component and a lifting component. The limiting component is used to lock the lifting sleeve onto the support frames. The lifting component is connected to the operating platform and can drive the operating platform to rise and fall.

[0006] Preferably, the support frame includes two legs and a crossbar connecting the two legs. The legs are provided with a plurality of transversely penetrating positioning holes spaced apart along their longitudinal direction. The lifting sleeve is provided with a connecting hole that can be horizontally aligned with the positioning holes. The lifting sleeve is slidably fitted onto the legs.

[0007] Preferably, the limiting component includes a pin that can be inserted into the aligned connecting hole and positioning hole to lock the lifting sleeve on the foot rod. The end of the pin away from the connecting hole is provided with a drive rod, and a movable part that can rotate relative to the drive rod is sleeved on the drive rod. By pulling the movable part outward, the pin can be driven out of the connecting hole and positioning hole.

[0008] Preferably, the foot rod is provided with a column, and a gap is formed between the column and the foot rod for the lifting sleeve to move. A first drive chamber is provided on the outside of the column, and a through hole is opened on the column. The pin is movably disposed in the first drive chamber and can extend or retract through the through hole. A return spring for driving the pin to extend and reset is also provided in the first drive chamber.

[0009] Preferably, a second drive compartment is provided at the end of the first drive compartment away from the column. A limiting ring is provided on the outer wall of the second drive compartment. A groove is provided on the limiting ring. An abutment part matching the groove is provided on the movable part. By pulling the movable part outward to make the abutment part pass through the groove, rotating the movable part can make the abutment part lock against the outer wall of the limiting ring, thereby keeping the pin in the unlocked position.

[0010] Preferably, the end of the drive rod away from the pin is provided with a rotating disk, and the rotating disk is provided with a handle. By operating the handle, the drive rod can be driven to rotate. The drive rod is also fixed with a mating part, which rotates synchronously with the drive rod. The second drive compartment is provided with a docking assembly that mates with the mating part.

[0011] Preferably, the docking assembly includes a connecting plate hinged to the outer wall of the second drive compartment and a docking rod mounted on the connecting plate. The docking hole portion is cylindrical, with a plurality of guide holes evenly spaced on its circumference. One end of the docking rod has a guide head that mates with the guide hole, and the other end has a drive seat that can elastically press the guide head into the guide hole.

[0012] Preferably, the lifting assembly includes a winding drum and a steel wire guide rope wound on the winding drum. The winding drum is sleeved on the drive rod and can rotate synchronously with the drive rod. The winding drum is located inside the second drive chamber. The top of the second drive chamber has an opening for the steel wire guide rope to extend out. The steel wire guide rope extends upward through the opening, passes through the guide seat set on the top of the support frame, and is then fixed on the operating platform.

[0013] Preferably, the spacing between adjacent guide holes matches the spacing between adjacent positioning holes, so that when the drive rod is rotated to retract or extend the wire guide rope, when the guide head engages in one of the guide holes, the connecting hole aligns with a set of positioning holes, and when the drive rod is rotated until the guide head engages in the next guide hole, the connecting hole aligns with another set of positioning holes.

[0014] Preferably, the lower end of the tripod assembly is connected to a wheel frame, and the wheel frame is provided with wheels and brakes.

[0015] Compared with the prior art, the present invention has the following advantages through the above technical solution: By setting a limiting ring sleeve outside the drive chamber and setting a mating part on the movable part, the mating part can be locked against the outer wall of the limiting ring sleeve after the pin is pulled outward and the movable part is rotated, thereby keeping the pin in the unlocked position of the exit positioning hole. This solves the technical problem in the prior art that the operator needs to continuously pull the pin to raise and lower the platform, while avoiding the safety hazards caused by the pin's accidental rebound, and improving the convenience and safety of operation. In addition, by setting an integrated structure that links the lifting component and the limiting component, convenience is provided during the lifting operation. Specifically, by setting the winding drum sleeve on the pin drive rod and making it rotate synchronously with the drive rod, the drive rod drives the winding drum to wind the steel wire guide rope. The steel wire guide rope pulls the operating platform through the guide seat, so that turning the handle can easily and effortlessly drive the platform to raise and lower, solving the technical problems of laborious manual lifting and difficulty in precise displacement control.

[0016] Meanwhile, this invention also includes a linkage alignment mechanism. Specifically, a cylindrical alignment part is fixed on the drive rod, and multiple guide holes are equidistantly opened on the circumference of the alignment part. The spacing between these guide holes is set to match the spacing of adjacent positioning holes and adjacent connecting holes on the foot rod. At the same time, a docking assembly is provided on the outer wall of the second drive compartment, and its elastic guide head is always pressed against the circumference of the alignment part under the action of spring force. When the operator turns the handle, the drive rod synchronously drives the winding drum and the alignment part to rotate together. The winding drum winds up and unwinds the steel wire guide rope to drive the platform to rise and fall, while the alignment part rotates relative to the docking assembly. As the platform continues to rise or fall, the connecting hole on the lifting sleeve gradually approaches the next target positioning hole in the vertical direction. At this time, the circumference of the alignment part also rotates synchronously, and the guide holes opened on it move towards the direction of the elastic guide head. When the connecting hole moves to the moment when it is horizontally aligned with a certain set of positioning holes, one of the guide holes on the alignment part also rotates to the position facing the elastic guide head, and the guide head is locked into the guide hole under the action of spring force. This locking action provides clear feedback, allowing the operator to determine the precise alignment of the connecting hole and the positioning hole simply by feeling the guide head engage with the guide hole during rotation, without needing to visually inspect the hole position. Releasing the movable part at this point allows the pin to automatically pass through the connecting hole and positioning hole under the drive of the return spring, completing the locking process. Therefore, each engagement indicator of the guide head engaging with the guide hole precisely corresponds to the alignment of the center of the connecting hole with a set of positioning holes. The operator only needs to rotate the handle while sensing the engagement position to achieve precise hole alignment in one step during lifting and lowering, avoiding the tedious operation of repeated fine-tuning and trial insertion in traditional methods. This improves the efficiency and accuracy of scaffold height adjustment and solves the technical problem of difficult hole alignment in existing lifting scaffolds. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the tripod assembly and the lifting slide sleeve of the present invention; Figure 5 This is a side view of the pin locking state structure of the present invention; Figure 6This is a schematic diagram of the locking state structure of the pin of the present invention; Figure 7 For the present invention Figure 6 A partially enlarged structural diagram; Figure 8 This is a side view of the latch in the unlocked state of the present invention. Figure 9 This is a schematic diagram of the latch unlocking state structure of the present invention; Figure 10 For the present invention Figure 9 A partially enlarged structural diagram; Figure 11 This is a schematic diagram of the mating assembly and the mating hole of the present invention. Figure 12 This is a schematic diagram of the drive rod structure of the present invention; The invention reference information is as follows: 1. Operating platform; 2. Leg assembly; 4. Column; 5. Second drive compartment; 6. Docking assembly; 7. Wheel frame; 101. Lifting sleeve; 102. Connecting hole; 201. Support frame; 202. Leg rod; 203. Crossbar; 204. Positioning hole; 205. Guide seat; 301. Limiting assembly; 302. Lifting assembly; 303. Pin; 304. Drive rod; 305. Moving part; 306. Abutment part; 307. Rotating disk; 308. Handle; 309. Alignment part; 310. Guide hole; 311. Winding spool; 312. Steel wire guide rope; 401. Gap; 402. First drive compartment; 403. Return spring; 501. Limiting ring; 502. Through groove; 601. Connecting plate; 602. Docking rod; 603. Drive seat; 701. Wheel; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The following will refer to the appendices in the embodiments of the present invention. Figure 1-12 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0022] like Figure 1-3 As shown: A height-adjustable scaffold includes an operating platform 1 for construction workers to stand on and place materials, and a scaffold assembly 2 for stabilizing support and adjusting the height of the operating platform. The scaffold assembly 2 consists of support frames 201 vertically arranged on both sides of the operating platform 1, and an adjustment mechanism integrated into the support frames 201. The operating platform 1 and the scaffold assembly 2 are movably connected. Specifically, a lifting sleeve 101 is fixedly installed on the side of the operating platform 1. The lifting sleeve 101 has through holes that match the cross-sectional shape of the leg rods 202 of the support frame 201, allowing it to slidably fit onto the support frame 201, thus providing a lifting track for the operating platform 1. The adjustment mechanism includes a limit component 301 and a lifting component 302. The function of the limit component 301 is to securely lock the operating platform 1 onto the support frame 201 after it reaches the target working height, bearing all loads on the platform and above to ensure construction safety. The lifting component 302 is directly connected to the operating platform 1. Its function is to actively drive the operating platform 1 to rise or fall by manual operation in the unlocked state, replacing the traditional method of pure manual lifting.

[0023] like Figure 1-3As shown: Each support frame 201 includes two parallel, vertically arranged leg rods 202 and multiple crossbars 203 for connecting the two leg rods 202 into a frame structure. During the lifting process, an operator needs to be positioned at each leg rod 202. When lifting is required, all operators should move synchronously. Alternatively, one side can be lifted first, followed by the other side. On each leg rod 202, multiple positioning holes 204 are provided at equal intervals or predetermined intervals along its longitudinal direction (i.e., the height direction). These positioning holes 204 are transversely through, completely penetrating the cross-section of the leg rod 202, for easy locking with pins. Corresponding to these positioning holes 204, a connecting hole 102 is provided on the lifting sleeve 101. The inner surface of the lifting sleeve 101 slides against the outer surface of the leg rod 202, and the axial direction of the connecting hole 102 is parallel to the axial direction of the positioning hole 204. When the lifting sleeve 101 slides along the foot rod 202 to a specific position, the connecting hole 102 can be horizontally aligned with the positioning hole 204 at a certain height, forming a complete channel through which the locking pin can pass.

[0024] like Figure 4 As shown: The limiting component 301 includes a pin 303, the cross-sectional shape and size of which match the connecting hole 102 and the positioning hole 204. When the connecting hole 102 and the positioning hole 204 are aligned, the pin 303 can be inserted laterally and pass through both holes to form a locking state, thereby completely locking the position of the lifting sleeve 101 onto the foot rod 202. At the end of the pin 303 away from the connecting hole 102, a drive rod 304 is fixedly connected, which acts as a transmission shaft to transmit external linear pull to the pin 303. A movable part 305 is movably sleeved on the drive rod 304. The movable part 305 can rotate independently relative to the drive rod 304. Specifically, the movable part is axially positioned on the drive rod by bearings or steps and snap rings. When the operator needs to unlock, the movable part 305 is pulled outward along the axis of the drive rod 304. Since there is no relative displacement between the movable part 305 and the drive rod 304 in the axial direction, the pulling force is transmitted to the pin 303 through the drive rod 304, thereby causing the pin 303 to overcome the resistance and exit from the connecting hole 102 and the positioning hole 204.

[0025] In this embodiment, the pin 303 is a double-headed pin structure, including an upper locking pin and a lower locking pin arranged in parallel. At the same time, a connecting plate is provided on the rear end of the upper locking pin and the lower locking pin, that is, on the side away from the connecting hole 102. A mounting hole is provided on the side of the connecting plate away from the upper locking pin and the lower locking pin. One end of the drive rod 304 extends into the mounting hole and is axially limited therein. At the same time, the drive rod 304 can rotate in the mounting hole. This structure makes it so that the drive rod 304 will not drive the pin 303 to rotate during rotation, but can drive the pin 303 to move synchronously during the pulling process.

[0026] like Figure 5-10 As shown: A column 4 is provided outside the foot rod 202, and the column 4 is arranged parallel to the foot rod 202, with a space 401 reserved between them to accommodate the side wall of the lifting sleeve 101. The lifting sleeve 101 can slide along the foot rod 202 within the gap 401, while the column 4 protects it from the outside. On the outside of the column 4, a first drive chamber 402 is fixedly installed. In this embodiment, the first drive chamber 402 consists of two horizontal plates fixed to the outside of the column 4 and a vertical plate, which together enclose the column 4. On the side wall of the column 4, a through hole is provided corresponding to the position of the pin 303. The pin 303 is movably disposed inside the first drive chamber 402, and its front end can extend or retract through the through hole to perform locking or unlocking actions. Inside the first drive chamber 402, there is also an elastic element, namely a return spring 403. One end of the return spring 403 abuts against the inner wall of the first drive chamber 402, and the other end abuts against the shoulder of the pin 303 or the drive rod 304. It always applies an elastic thrust to the pin 303 extending in the direction of the foot rod 202. In this embodiment, the upper and lower ends of the connecting plate are sleeved on the smooth rod located on the upper and lower sides of the first drive chamber 402, and the two ends of the return spring 403 abut against the vertical plate and the connecting plate respectively.

[0027] The reset spring 403 enables the automatic locking function of the pin. When the pin 303 is pulled out to unlock, as long as the operator releases their hand, the spring force will automatically drive the pin 303 to move to the locked position. Once the connecting hole 102 is aligned with the positioning hole 204, the pin 303 will automatically insert and lock instantly, improving the safety and convenience of operation.

[0028] like Figure 5-10 As shown: The end of the first drive chamber 402 furthest from the column 4 is connected to a second drive chamber 5. The second drive chamber 5 is used to house the lifting assembly 302. A limiting ring 501 is fixedly installed on the outer wall of the second drive chamber 5, and one or more grooves 502 of a specific shape are formed thereon. Correspondingly, the movable part 305 has an outwardly protruding abutment part 306 that matches the shape and size of the groove 502. When the operator pulls the movable part 305 outward, causing the pin 303 to completely exit the connecting hole 102 and the positioning hole 204 and be in the unlocked position, the abutment part 306 can pass through the groove 502. At this time, the operator only needs to rotate the movable part 305 by an angle to make the position of the abutment part 306 displace the groove 502, and then release the hand. The abutment part 306 will then press tightly against the outer wall of the limiting ring 501, forming a stable locking state.

[0029] like Figure 1-10As shown: A rotating disk 307 is provided at the end of the drive rod 304 away from the pin 303. A handle 308 is installed on the eccentric position or outer edge of the rotating disk 307. By cranking the handle 308, the operator can apply a torque to drive the drive rod 304 to rotate around its own axis. A mating part 309 is also fixedly installed on the drive rod 304. The mating part 309 and the drive rod 304 are rigidly connected by a key connection, pin connection, or integral molding to ensure that the two can rotate synchronously. At the same time, a docking assembly 6 is provided on the outside of the second drive chamber 5 to cooperate with the mating part 309.

[0030] like Figure 10-11 As shown: The docking assembly 6 includes a connecting plate 601, one end of which is hinged to the outer wall of the second drive chamber 5, and the other end is a movable end on which a docking rod 602 is fixedly mounted. The mating hole portion 309 is specifically designed as a cylinder, with a plurality of guide holes 310 evenly spaced at a predetermined specific interval on its circumferential surface. At one end of the docking rod 602 facing the mating hole portion 309, a guide head adapted to the contour of the guide holes 310 is provided. This guide head can be in the form of a ball head, a cone head, or a roller. In order to provide continuous and controllable pressure, a drive seat 603 is provided at the other end of the docking rod 602, that is, on the connecting plate 601. The drive seat 603 contains a compression spring. The elastic force of the spring acts on the docking rod 602, so that its guide head can always elastically press against the circumferential surface of the mating hole portion 309. When the alignment part 309 rotates with the drive rod 304, and a certain guide hole 310 is rotated to the position directly opposite the guide head, the guide head will automatically engage in the guide hole 310 under the elastic force of the drive seat 603, thus achieving rapid alignment.

[0031] Furthermore, by hinged to the outer wall of the second drive compartment 5, the connecting plate 601 can be folded and stored when not in use.

[0032] like Figure 12As shown, the lifting assembly 302 includes a winding drum 311, which is sleeved on the drive rod 304 through a central hole and circumferentially fixed to the drive rod 304 by a key, spline, or other structure to ensure synchronous rotation. The winding drum 311 is located entirely inside the second drive chamber 5. Specifically, the winding drum is axially fixed inside the second drive chamber. The drive rod and the winding drum are connected by a sliding key or spline, allowing it to slide relative to the winding drum axially and transmit torque. A flexible, high-strength tensile member, in this embodiment, is a steel wire guide rope 312 wound around the body of the winding drum 311. Correspondingly, an opening is provided at the top of the second drive chamber 5 for the steel wire guide rope 312 to extend smoothly. One end of the steel wire guide rope 312 is fixed to the winding drum 311, and the other end extends from the opening, extends upward to the top of the support frame 201, passes around the guide seat 205 installed here to change the direction of force (in this embodiment, the guide seat 205 is a pulley seat), and then hangs down and is finally fixed to a firm suspension point on the operating platform 1.

[0033] There is a preset matching relationship between the arc length spacing or angle value between adjacent guide holes 310 and the straight-line spacing between adjacent positioning holes 204. This matching relationship is achieved through transmission ratio calculation, that is, the diameter of the winding drum 311, the number of winding layers of the steel wire guide rope 312, and the transmission from the handle 308 to the drive rod 304 together determine the displacement of the operating platform 1 for each rotation of the drive rod 304. During the design, it is ensured that when the drive rod 304 rotates through the angle corresponding to a guide hole 310, the length of the steel wire guide rope 312 is exactly equal to the distance required for the connecting hole 102 on the lifting sleeve 101 to move from one positioning hole 204 to the next adjacent positioning hole 204. Therefore, when the operator rotates the handle 308 to perform the lifting operation and senses that the guide head is engaged in a guide hole 310, it means that the connecting hole 102 is precisely aligned with a set of positioning holes 204. Continuing to rotate until the guide head engages in the next guide hole 310, the connecting hole 102 will then be precisely aligned with the next set of positioning holes 204. In this way, the operator no longer needs to visually inspect the hole alignment repeatedly, nor does they need to make minor adjustments by tapping. Simply rotating the handle allows the operator to sense whether the holes are aligned. When aligned, simply releasing the movable part allows the pin 303 to automatically and precisely insert into the hole under the drive of the return spring 403, completing the locking process.

[0034] like Figure 1 As shown: To enhance the mobility of the entire scaffolding, a wheel frame 7 is connected and installed at the lower end of the scaffolding assembly 2, i.e., at the bottom of each leg 202. The wheel frame 7 is a support structure on which wheels 701 that can roll on the ground are mounted, and it is also equipped with brakes that can effectively lock the rotation of the wheels or the movement of the frame. The brakes can be shoe brakes acting on the wheel surface or outrigger brakes acting on the road surface.

[0035] The operation process of this invention is as follows: When adjusting the platform height, first pull the movable part 305 outward and rotate it so that the abutment part 306 engages with the limiting ring 501, while the pin 303 remains unlocked. Then, crank the handle 308 to drive the platform up or down via the steel wire guide rope 312. During cranking, the guide head of the docking component 6 will continuously engage and disengage from the guide hole 310 on the mating part 309, producing a clear sense of engagement. When near the target height, simply slow down until you feel the guide head engage with the guide hole 310, at which point the connecting hole 102 is precisely aligned with a set of positioning holes 204. At this point, rotate the movable part 305 in the opposite direction to disengage the abutment part 306 from the limiting ring 501, and the pin 303 will automatically pop out under the drive of the return spring 403, passing through the connecting hole 102 and the positioning hole 204 to complete the locking. The entire operation is smooth, effortless, and precise.

[0036] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A liftable scaffold, comprising an operating platform (1) and a scaffold assembly (2) for supporting the operating platform (1), characterized in that: The tripod assembly (2) includes a support frame (201) respectively disposed on both sides of the operating platform (1) and an adjustment mechanism installed on the support frame (201). The operating platform (1) is provided with a lifting sleeve (101) that is slidably sleeved on the support frame (201). The adjustment mechanism includes a limiting component (301) and a lifting component (302). The limiting component (301) is used to lock the lifting sleeve (101) on the support frame (201). The lifting component (302) is connected to the operating platform (1) and can drive the operating platform (1) to rise and fall.

2. The height-adjustable scaffolding according to claim 1, characterized in that: The support frame (201) includes two legs (202) and a crossbar (203) connecting the two legs (202). The legs (202) are provided with a plurality of transversely penetrating positioning holes (204) spaced apart along their longitudinal direction. The lifting sleeve (101) is provided with a connecting hole (102) that can be horizontally aligned with the positioning holes (204). The lifting sleeve (101) is slidably fitted onto the legs (202).

3. The height-adjustable scaffolding according to claim 2, characterized in that: The limiting component (301) includes a pin (303) that can be inserted into the aligned connecting hole (102) and positioning hole (204) to lock the lifting sleeve (101) onto the foot rod (202). A drive rod (304) is provided at one end of the pin (303) away from the connecting hole (102). A movable part (305) that can rotate relative to the drive rod (304) is sleeved on the drive rod (304). By pulling the movable part (305) outward, the pin (303) can be driven to exit the connecting hole (102) and positioning hole (204).

4. A height-adjustable scaffolding according to claim 3, characterized in that: The foot rod (202) is provided with a column (4) on the outside. A gap (401) is formed between the column (4) and the foot rod (202) for the lifting sleeve (101) to move. A first drive chamber (402) is provided on the outside of the column (4). A through hole is provided on the column (4). The pin (303) is movably disposed in the first drive chamber (402) and can extend or retract through the through hole. A return spring (403) is also provided in the first drive chamber (402) for driving the pin (303) to extend and reset.

5. A height-adjustable scaffold according to claim 4, characterized in that: The first drive chamber (402) is provided with a second drive chamber (5) at the end away from the column (4). A limiting ring (501) is provided on the outer wall of the second drive chamber (5). A groove (502) is provided on the limiting ring (501). An abutment (306) matching the groove (502) is provided on the movable part (305). By pulling the movable part (305) outward so that the abutment (306) passes through the groove (502), rotating the movable part (305) can make the abutment (306) abut against the outer wall of the limiting ring (501), thereby keeping the pin (303) in the unlocked position.

6. A height-adjustable scaffold according to claim 5, characterized in that: The drive rod (304) has a rotating disk (307) at one end away from the pin (303). The rotating disk (307) has a handle (308). By operating the handle (308), the drive rod (304) can be rotated. The drive rod (304) also has a mating hole (309) fixed on it. The mating hole (309) rotates synchronously with the drive rod (304). The second drive chamber (5) has a docking assembly (6) that mates with the mating hole (309).

7. A height-adjustable scaffold according to claim 6, characterized in that: The docking assembly (6) includes a connecting plate (601) hinged to the outer wall of the second drive chamber (5) and a docking rod (602) mounted on the connecting plate (601). The docking hole portion (309) is cylindrical, and a plurality of guide holes (310) are equally spaced on its circumferential surface. One end of the docking rod (602) has a guide head that cooperates with the guide hole (310), and the other end has a drive seat (603) that can elastically press the guide head into the guide hole (310).

8. A height-adjustable scaffold according to claim 3, characterized in that: The lifting assembly (302) includes a winding drum (311) and a steel wire guide rope (312) wound on the winding drum (311). The winding drum (311) is sleeved on the drive rod (304) and can rotate synchronously with the drive rod (304). The steel wire guide rope (312) is fixed on the operating platform (1) after passing through the guide seat (205) set at the top of the support frame (201).

9. A height-adjustable scaffold according to claim 7, characterized in that: The spacing between adjacent guide holes (310) matches the spacing between adjacent positioning holes (204).

10. A height-adjustable scaffold according to claim 1, characterized in that: The lower end of the tripod assembly (2) is connected to a wheel frame (7), on which a wheel (701) and a brake are provided.

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