Stage lifting steps

Abstract

The present invention discloses a stage lifting step, which relates to the field of lifting steps, including a base and a limit rod, and the limit rod is distributed on both sides of the base, and a cylinder is installed inside the base, and the cylinders are respectively a first cylinder and a second cylinder, and a support plate is connected above the output end of the cylinder and located above the base, and a plurality of groups of movable blocks are movably installed at the bottom of the support plate, and each group of movable blocks is aligned with the output end of the cylinder, and a bellows is provided at the top of the movable block located inside the support plate. The present invention can push the movable block to squeeze the bellows when the wheelchair is moved to the top of the support plate through the movable blocks, clamps, conduction mechanisms and hydraulic cylinders, and when the support plate is supported and pushed, the hydraulic oil in the bellows enters the hydraulic belt and the hydraulic cylinder respectively through each group of pipes, and the hydraulic cylinder pushes the clamps to move to the position of the wheelchair tire, and the hydraulic belt expands to clamp the tire.

Description

Technical Field

[0001] The invention relates to the field of lifting steps, in particular to a stage lifting step. Background Art

[0002] With the continuous development of the economy, people's material living standards are gradually improving, and entertainment and cultural life are becoming more colorful. More and more people choose to watch stage performances during business hours, so the requirements for stage effects are getting higher and higher. In order to make the stage beautiful and tidy, a higher stage will be used to facilitate the display of performances.

[0003] In the existing stage, when characters appear on stage, they usually need to climb higher steps. The existing steps are usually made of metal frames and metal plates. During use, if a disabled person needs to climb the steps, he usually needs help from others to move the wheelchair. For ease of use, lifting steps are usually used.

[0004] However, in order to reduce the occupied space, the existing lifting steps usually need to be hidden during use. During use, the steps are put away and assembled when in use. The assembly speed is not only slow but also has low stability. Secondly, when people are lifted or lowered through the steps, it is usually necessary to use a baffle to intercept the wheelchair to prevent the wheelchair from falling from the lifting steps during the lifting process. The existing interception plate is usually raised from the outside of the steps. After rising, the wheelchair cannot be restricted in time and can only be intercepted when the wheelchair deviates to the edge of the steps. In this process, it is still easy to cause injuries due to the inertia of the wheelchair, and the use effect is poor. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a stage lifting step to solve the technical problems of slow step lifting speed and poor interception effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a stage lifting step, comprising a base and a limit rod, and the limit rods are distributed on both sides of the base, a cylinder is installed inside the base, and the cylinders are respectively a first cylinder and a second cylinder, and a support plate is connected above the output end of the cylinder and located above the base, and a plurality of groups of movable blocks are movably installed at the bottom end of the support plate, and each group of movable blocks is aligned with the output end of the cylinder, and the top of the movable block is located inside the support plate and a bellows is opened, and the inside of the bellows is filled with hydraulic oil, and the top of the bellows is connected to a transmission mechanism, and two groups of output ends of the transmission mechanism are respectively connected with a clamping plate and a hydraulic cylinder, and the clamping plate is fixed on the output end of the hydraulic cylinder, and the clamping plate is located above the support plate, and the top of the clamping plate is connected with a hydraulic belt, and the inside of the hydraulic belt is a cavity, and a step plate arranged equidistantly is opened on one side of the support plate between the limit rods, and a first docking groove is opened at the edge of the support plate, and a first docking groove and a second docking groove are opened at the edge of each group of the step plates, and the support plate is transmission-connected to the step plate through the docking groove.

[0007] By adopting the above technical solution, the wheelchair can be limited by the support plate and the structure on the support plate. When the support plate is pushed upward by the cylinder, the clamping plate is pushed to move by the hydraulic cylinder to clamp the wheelchair tire.

[0008] The present invention is further configured such that a hollow frame is connected to one side of the support plate between the limiting rods, and the step plates are equidistantly arranged above the hollow frame.

[0009] By adopting the above technical solution, the step board can be limited to facilitate going onto the stage.

[0010] The present invention is further configured such that limit blocks are provided on both sides of the support plate, a guide groove is provided at the bottom end of the limit rod, and the limit block is engaged and connected with the limit rod through the guide groove, an electricity connection structure is provided inside the limit block, and an electricity connection rod is provided at the top of the inner wall of the guide groove, and the electricity connection structure contacts the electricity connection rod to supply power to the support plate.

[0011] By adopting the above technical solution, the mechanism inside the support plate can be powered after the support plate moves to the top end.

[0012] The present invention is further configured such that a solenoid valve is connected to the side of the support plate close to the step plate, and the output end of the solenoid valve is connected to a telescopic cylinder, the output end of the telescopic cylinder extends to the outside of the support plate, the solenoid valve is connected to the conduction mechanism close to the step plate, and the solenoid valve is connected to the power connection structure inside the limit block through a wire.

[0013] By adopting the above technical solution, it is convenient to send the hydraulic oil in the transmission mechanism into the telescopic cylinder through the solenoid valve.

[0014] The present invention is further configured such that a moving rod is opened inside the step plate, and both ends of the moving rod extend to the outside of the step plate, a baffle is connected to the middle part of the moving rod, and a spring is symmetrically arranged about the baffle, a cavity is opened inside the step plate on the outside of the spring, and the end of the spring is fixed to the inner wall of the cavity.

[0015] By adopting the above technical solution, the moving rod can be pushed to move through the output end of the telescopic cylinder, so that the moving rods are plugged into each other to fix the step plate.

[0016] The present invention is further configured such that the conduction structure includes a conduit, a threaded pipe and a connecting pipe, the conduit is connected to the corrugated pipe, and a section of the conduit is connected to the threaded pipe, the threaded pipe is connected to the hydraulic belt at the top of the splint, the connecting pipe is located between the conduit and the hydraulic cylinder, and the conduit is connected to the hydraulic cylinder through the connecting pipe.

[0017] By adopting the above technical solution, the hydraulic oil can be transmitted through the conduction structure, so that the hydraulic oil enters into each group of mechanisms inside the support plate.

[0018] The present invention is further configured such that a slider is provided at the bottom end of the splint, and a groove is provided at the top end of the support plate, the splint is located inside the groove, a slide groove connected to the inside of the support plate is provided on the inner wall of the groove, and the splint is slidably connected to the slide groove via the slider.

[0019] By adopting the above technical solution, the clamping plate can be conveniently limited.

[0020] In summary, the present invention mainly has the following beneficial effects:

[0021] 1. The present invention provides multiple groups of cylinders, support plates, step plates and multiple groups of docking grooves. When the steps are raised, the support plates are first pushed upward by the multiple groups of cylinders, and the support plates are aligned with the docking grooves on the sides of the step plates through the docking grooves on the sides, thereby driving the step plates to move upward. The step plates are also driven upward by each other through the docking grooves in turn until a complete plate surface is formed, thereby improving the installation speed and effectively solving the problem of slow step lifting speed.

[0022] 2. The present invention, through the provision of movable blocks, clamping plates, conducting mechanisms and hydraulic cylinders, can, after the wheelchair is moved above the support plate, push the movable blocks to squeeze the bellows when supporting and pushing the support plate, and the hydraulic oil in the bellows respectively enters the hydraulic belt and the hydraulic cylinder through various groups of pipes, and the hydraulic cylinder pushes the clamping plates to move toward the wheelchair tire position, and the hydraulic belt expands to clamp the tire, thereby conveniently clamping tires of different sizes, improving the clamping effect, and effectively solving the problem of poor interception effect.

[0023] 3. The present invention also opens the solenoid valve before moving the wheelchair by means of the solenoid valve, telescopic cylinder, step plate and transmission control of the first cylinder and the second cylinder, so that the hydraulic oil in the conduction mechanism close to the step plate enters the telescopic cylinder, is inserted into the interior of the step plate through the output end of the telescopic cylinder, and squeezes each group of moving rods to limit and fix the step plate to avoid separation of the step plate and the support plate during the movement of the wheelchair. Secondly, the hydraulic oil in the hydraulic belt can be extracted to avoid the hydraulic belt blocking the movement of the wheelchair during the movement of the wheelchair. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the cross-section internal structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the support plate structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the unstressed structure of the support plate of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the support plate of the present invention after being subjected to force;

[0029] Figure 6 It is a schematic diagram of the support plate fixing structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the support plate return structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the bellows and pipeline installation structure of the present invention;

[0032] Fig. 9 It is a schematic diagram of the splint structure of the present invention;

[0033] Fig.10 It is a schematic diagram of the top view structure of the support plate of the present invention;

[0034] Fig.11 It is a schematic diagram of the internal transmission structure of the support plate and each group of step plates of the present invention.

[0035] In the figure: 1. base; 101. hollow frame; 2. limit rod; 201. guide groove; 3. support plate; 301. limit block; 302. slide groove; 4. step plate; 401. moving rod; 402. baffle; 403. spring; 404. cavity; 501. first cylinder; 502. second cylinder; 6. movable block; 7. splint; 701. hydraulic belt; 702. slider; 8. conduit; 9. hydraulic cylinder; 10. threaded pipe; 11. connecting pipe; 12. bellows; 13. solenoid valve; 14. telescopic cylinder; 15. first docking groove; 16. second docking groove. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] The following describes an embodiment of the present invention based on its overall structure.

[0038] A stage lifting step, such as Figures 1 to 11 As shown, it includes a base 1 and a limit rod 2, and the limit rod 2 is distributed on both sides of the base 1, and a cylinder is installed inside the base 1, and the cylinders are respectively a first cylinder 501 and a second cylinder 502, and the output end of the cylinder is located above the base 1 and is connected to a support plate 3. When the wheelchair is moved, multiple groups of cylinders are started, and the output ends of the cylinders are inserted under the support plate 3. Multiple groups of movable blocks 6 are movably installed at the bottom of the support plate 3, and each group of movable blocks 6 is aligned with the output end of the cylinder. The top of the movable block 6 is located inside the support plate 3 and a bellows 12 is opened, and the inside of the bellows 12 is filled with hydraulic oil. The top of the bellows 12 is connected to a conduction mechanism, and the two groups of output ends of the conduction mechanism are respectively connected to a clamping plate 7 and a hydraulic cylinder 9, and the clamping plate 7 is fixed on the output end of the hydraulic cylinder 9, and the clamping plate 7 is located Above the support plate 3, the top of the clamping plate 7 is connected with a hydraulic belt 701, the interior of the hydraulic belt 701 is a cavity, and it pushes different movable blocks 6 to move, so that the movable blocks 6 squeeze the bellows 12, and the hydraulic oil in the bellows 12 is injected into the transmission mechanism, and the hydraulic oil is sent to the inside of the clamping plate 7 and the hydraulic cylinder 9 through the transmission mechanism, pushing the hydraulic belt 701 to protrude, pushing the hydraulic cylinder 9 to start, and the output end of the hydraulic cylinder 9 pushes the clamping plate 7 to move, so that the two groups of clamping plates 7 move toward the wheelchair tire direction until the wheelchair tire is clamped, and at this time, the protruding hydraulic belt 701 limits the wheelchair tire, and can limit and fix the wheelchair during the movement process to prevent the wheelchair from shifting during the movement process, and can limit tires of different positions and sizes by moving the clamping plate 7;

[0039] An equidistantly arranged step plate 4 is provided on one side of the support plate 3 between the limit rods 2, a first docking groove 15 is provided on the edge of the support plate 3, and a first docking groove 15 and a second docking groove 16 are provided on the edge of each group of step plates 4. The pressure output by the cylinder is transmitted to the support plate 3, and the support plate 3 is pushed to move upward through the limit block 301, and the support plate 3 drives the wheelchair to move upward synchronously, and the clamping plate 7 limits the wheelchair. When the first docking groove 15 on the edge of the support plate 3 fits with the second docking groove 16 on the edge of the step plate 4, the support plate 3 drives the step plate 4 to move upward, and in turn drives multiple groups of step plates 4 to move upward synchronously;

[0040] Limit blocks 301 are provided on both sides of the support plate 3, a guide groove 201 is provided at the bottom end of the limit rod 2, and the limit block 301 is connected with the limit rod 2 through the guide groove 201, an electric connection structure is provided inside the limit block 301, and an electric connection rod is provided at the top of the inner wall of the guide groove 201, the electric connection structure contacts the electric connection rod to supply power to the support plate 3, and a solenoid valve 13 is connected to the side of the support plate 3 close to the step plate 4, and the output end of the solenoid valve 13 is connected to the telescopic cylinder 14, and the output end of the telescopic cylinder 14 extends to the support plate 3. On the outside of the support plate 3, the solenoid valve 13 is connected to the conduction mechanism close to the step plate 4, and the solenoid valve 13 is connected to the power connection structure inside the limit block 301 through a wire. A moving rod 401 is provided inside the step plate 4, and both ends of the moving rod 401 extend to the outside of the step plate 4. A baffle 402 is connected to the middle part of the moving rod 401, and a spring 403 is symmetrically arranged about the baffle 402. A cavity 404 is provided inside the step plate 4 on the outside of the spring 403, and the end of the spring 403 is fixed. On the inner wall of the cavity 404, the limit block 301 on the side of the support plate 3 is plugged into the plug in the guide groove 201, connecting the support plate 3 to the external power supply. At this time, the solenoid valve 13 is powered on and opened, and the hydraulic oil inside the bellows 12 close to the stage enters the telescopic cylinder 14, causing the hydraulic belt 701 connected to the group of bellows 12 and the hydraulic oil pressure inside the hydraulic cylinder 9 to drop instantly. At this time, the group of hydraulic belts 701 deflates and no longer limits the wheelchair tire, so that the wheelchair can be easily pushed to move, and when the wheelchair presses over the hydraulic belt 701, the hydraulic oil pressure inside the hydraulic cylinder 9 is reduced. When belt 701 is moved, the hydraulic oil in the hydraulic belt 701 will also be squeezed out, allowing more hydraulic oil to enter the telescopic cylinder 14. The output end of the telescopic cylinder 14 will be inserted into the adjacent step plate 4, pushing the moving rod 401 in the step plate 4, so that the end of the moving rod 401 is inserted into another group of step plates 4, and each group of step plates 4 is connected together through the moving rod 401. Each group of step plates 4 is temporarily connected to the support plate 3 through the output end of the telescopic cylinder 14, and the wheelchair is moved to the stage through the step plates 4.

[0041] See also Figure 1 and Figure 2One side of the support plate 3 is connected with a hollow frame 101 between the limiting rods 2, and the step plates 4 are equidistantly arranged above the hollow frame 101, which can limit the step plates 4, thereby facilitating the up and down of the steps.

[0042] See also Figures 4 to 9 The conduction structure includes a conduit 8, a threaded tube 10 and a connecting tube 11. The conduit 8 is connected to the bellows 12, and a section of the conduit 8 is connected to the threaded tube 10. The threaded tube 10 is connected to the hydraulic belt 701 at the top of the splint. The connecting tube 11 is located between the conduit 8 and the hydraulic cylinder 9, and the conduit 8 is connected to the hydraulic cylinder 9 through the connecting tube 11, which can facilitate the transfer of hydraulic oil to the splint and the hydraulic cylinder, thereby facilitating the adjustment of the support plate.

[0043] See also Figure 3 and Fig.10 A slider 702 is provided at the bottom end of the splint 7, and a groove is provided at the top end of the support plate 3. The splint 7 is located inside the groove, and a slide groove 302 connected to the inside of the support plate 3 is provided on the inner wall of the groove. The splint 7 is slidably connected to the slide groove 302 through the slider 702, which is convenient for limiting the position of the splint 7, and the slider 702 slides in the slide groove 302 to limit the position of the splint 7.

[0044] The working principle of the present invention is as follows: when a person using a wheelchair needs to go on the stage, the wheelchair is first pushed onto the support plate 3 and positioned in the empty slot provided at the top of the support plate 3, multiple groups of cylinders are started, the output ends of the cylinders are inserted under the support plate 3, and different movable blocks 6 are pushed to move, so that the movable blocks 6 squeeze the bellows 12, the hydraulic oil in the bellows 12 is injected into the conduit 8, and enters the threaded tube 10 and the connecting tube 11 along the two ends of the conduit 8 respectively, the hydraulic oil in the threaded tube 10 is injected into the clamping plate 7, and the hydraulic belt 701 is pushed to unfold, and at this time, the hydraulic oil in the connecting tube 11 is injected into the hydraulic cylinder 9, and the hydraulic cylinder 9 is pushed to start, and the output end of the hydraulic cylinder 9 pushes the clamping plate 7 to move, so that the two groups of clamping plates 7 move toward the wheelchair tire direction until the wheelchair tire is clamped, and at this time, the protruding hydraulic belt 701 limits the wheelchair tire, and can limit and fix the wheelchair during the movement process to prevent the wheelchair from shifting during the movement process, and can limit the tires of different positions and sizes by moving the clamping plate 7, thereby improving the use efficiency;

[0045] After the wheelchair tire is clamped, the hydraulic oil in the bellows 12 cannot continue to be discharged. At this time, the pressure output by the cylinder is transmitted to the support plate 3, and the support plate 3 is pushed to move upward through the limit block 301, and the support plate 3 drives the wheelchair to move upward synchronously, and the clamping plate 7 limits the wheelchair. When the first docking groove 15 on the edge of the support plate 3 is fitted with the second docking groove 16 on the edge of the step plate 4, the support plate 3 drives the step plate 4 to move upward, and in turn drives multiple groups of step plates 4 to move upward synchronously until they move to the bottom of the limit rod 2, limiting the support plate 3 and the step plate 4. At this time, the limit block 301 on the side of the support plate 3 is plugged into the plug in the guide groove 201, connecting the support plate 3 to the external power supply. At this time, the solenoid valve 13 is powered on and opened, and the hydraulic oil inside the bellows 12 close to the stage is released. The hydraulic belt 701 is compressed and no longer limits the wheelchair tire, so the wheelchair can be easily pushed to move. When the wheelchair passes over the hydraulic belt 701, the hydraulic oil in the hydraulic belt 701 is squeezed out, so that more hydraulic oil enters the telescopic cylinder 14. The output end of the telescopic cylinder 14 is inserted into the adjacent step plate 4, and the moving rod 401 in the step plate 4 is pushed, so that the end of the moving rod 401 is inserted into another group of step plates 4. The groups of step plates 4 are connected together through the moving rod 401, and the groups of step plates 4 are temporarily connected to the support plate 3 through the output end of the telescopic cylinder 14. The wheelchair moves to the stage through the step plates 4.

[0046] After the wheelchair leaves the step plate 4, the step needs to be returned to its original position. At this time, the second cylinder 502 close to the stage is first started, so that the output end of the second cylinder 502 is first separated from the movable block 6. At this time, under the gravity of the movable block 6 itself, the bellows 12 is pulled back to its original position, and the bellows 12 extracts the hydraulic oil in the conduit 8, thereby extracting the hydraulic oil in the telescopic cylinder 14. The output end of the telescopic cylinder 14 returns to its original position, and each group of moving rods 401 also returns to its original position under the action of the spring, so that the support plate 3 and each group of step plates 4 are separated, and then the first cylinder is started. 501, the output end of the first cylinder 501 also moves downward, and the support plate 3 also moves downward. During the descent, the support plate 3 is separated from the external power supply, the solenoid valve 13 is closed, and the output end of the second cylinder 502 squeezes the movable block 6 again, so that the hydraulic belt 701 and the hydraulic cylinder 9 corresponding to the group of movable blocks 6 are re-injected with sufficient hydraulic oil, and expand again, and the remaining step plates 4 also move downward until each group of step plates 4 fits with the corresponding hollow frame 101, and the support plate 3 is engaged with the base 1 (the above process is also the process of the wheelchair from the dance floor to the dance floor). When the wheelchair reaches the support plate 3 on the platform, the process of operation inside the support plate 3 is that when the wheelchair returns to its original position, the cylinder is first started in the previous manner to push the support plate 3 and each group of step plates 4 to move upward, and connected through the telescopic cylinder 14 and the moving rod 401, and then the wheelchair is pushed through the step plate 4 to reach the support plate 3, and then the second cylinder 502 is first started to move downward, contact the extrusion between the telescopic cylinder 14 and each group of moving rods 401, so that the step plate 4 is separated from the support plate 3, and then the first cylinder 501 is started to drive the support plate 3 to move downward and contact the output end of the second cylinder 502 again. In this process, the movable block 6 will be pushed again to re-inject the hydraulic oil into the corresponding hydraulic belt 701 and the hydraulic cylinder 9, and the wheelchair tire is further limited and clamped), the output end of each group of cylinders continues to separate from the support plate 3, the movable block 6 pulls the bellows 12 back to its original position, the hydraulic oil re-enters the bellows 12, and the hydraulic belts 701 and the hydraulic cylinder 9 of each group are also returned to their original positions, releasing the limit on the wheelchair tire, making it convenient for the wheelchair to leave and for subsequent use.

[0047] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A stage lifting step, comprising a base (1) and a limiting rod (2), wherein the limiting rod (2) is distributed on both sides of the base (1), characterized in that: Cylinders are installed inside the base (1), and the cylinders are respectively a first cylinder (501) and a second cylinder (502). A support plate (3) is connected to the top of the output end of the cylinder, and a plurality of movable blocks (6) are movably installed at the bottom of the support plate (3). Each movable block (6) is aligned with the output end of the cylinder. The top of the movable block (6) is located inside the support plate (3) and is provided with a bellows (12). The bellows (12) is filled with hydraulic oil. The top of the bellows (12) is connected to a transmission mechanism. The two output ends of the transmission mechanism are respectively connected to a clamping plate (7) and a A hydraulic cylinder (9), the clamping plate (7) is fixed on the output end of the hydraulic cylinder (9), and the clamping plate (7) is located above the support plate (3), the top end of the clamping plate (7) is connected to a hydraulic belt (701), the interior of the hydraulic belt (701) is a cavity, and a step plate (4) is equidistantly arranged on one side of the support plate (3) between the limit rods (2), the edge of the support plate (3) is provided with a first docking groove (15), the edge of each group of the step plates (4) is provided with a first docking groove (15) and a second docking groove (16), and the support plate (3) is transmission-connected to the step plate (4) via the docking groove.

2. A stage lifting step according to claim 1, characterized in that: A hollow frame (101) is connected to one side of the support plate (3) between the limiting rods (2), and the step plates (4) are arranged equidistantly above the hollow frame (101).

3. The stage lifting step according to claim 1, characterized in that: Limit blocks (301) are provided on both sides of the support plate (3), a guide groove (201) is provided at the bottom end of the limit rod (2), and the limit block (301) is connected to the limit rod (2) by snapping through the guide groove (201), an electric connection structure is provided inside the limit block (301), and an electric connection rod is provided at the top end of the inner wall of the guide groove (201), and the electric connection structure contacts the electric connection rod to supply power to the support plate (3).

4. A stage lifting step according to claim 3, characterized in that: A solenoid valve (13) is connected to a side of the support plate (3) close to the step plate (4), and an output end of the solenoid valve (13) is connected to a telescopic cylinder (14). The output end of the telescopic cylinder (14) extends to the outside of the support plate (3). The solenoid valve (13) is connected to a conduction mechanism close to the step plate (4), and the solenoid valve (13) is connected to an electrical connection structure inside the limit block (301) through a wire.

5. The stage lifting step according to claim 1, characterized in that: A moving rod (401) is provided inside the step plate (4), and both ends of the moving rod (401) extend to the outside of the step plate (4); a baffle (402) is connected to the middle portion of the moving rod (401), and a spring (403) is symmetrically arranged with respect to the baffle (402); a cavity (404) is provided inside the step plate (4) and located outside the spring (403), and the end of the spring (403) is fixed to the inner wall of the cavity (404).

6. The stage lifting step according to claim 1, characterized in that: The conducting structure comprises a conduit (8), a threaded pipe (10) and a connecting pipe (11); the conduit (8) is connected to a bellows (12), and a section of the conduit (8) is connected to the threaded pipe (10); the threaded pipe (10) is connected to a hydraulic belt (701) at the top of a clamp (7); the connecting pipe (11) is located between the conduit (8) and a hydraulic cylinder (9), and the conduit (8) is connected to the hydraulic cylinder (9) through the connecting pipe (11).

7. The stage lifting step according to claim 1, characterized in that: The bottom end of the clamping plate (7) is provided with a sliding block (702), and the top end of the supporting plate (3) is provided with a groove, the clamping plate (7) is located inside the groove, and the inner wall of the groove is provided with a sliding groove (302) connected to the inside of the supporting plate (3), and the clamping plate (7) is slidably connected to the sliding groove (302) via the sliding block (702).

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