Rotary ladder stand

Abstract

The invention relates to the technical field of building facilities, in particular to a rotary ladder stand which comprises a chassis, a base is mounted on the chassis through a mounting mechanism, a plurality of supporting columns are welded to the base, and every two adjacent supporting columns are in threaded connection through a threaded rod; the supporting column is sleeved with a plurality of sleeves through limiting rods. Step plates are welded to the side walls of the sleeves, and the multiple step plates are evenly and spirally distributed around the supporting column. Through cooperation of the base, the supporting column and the step plates, the step plates are made of anti-skid corrugated steel plates, a 19-degree rising included angle is formed between every two adjacent steps, the step plates are spirally distributed around the supporting column, the ladder stand guardrails and the spiral handrails are welded to the edges, and according to the structure, the horizontal projection area is reduced through a rotating rising path, and the space utilization rate is increased; dynamic space utilization is achieved through the rotation design of the ladder body, the safety is guaranteed, and meanwhile the surrounding space occupied by the crawling ladder is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of building facilities, in particular to a rotary ladder. Background Art

[0002] A ladder is a component used for vertical transportation between floors in a building, and is used for transportation between floors and when there is a large height difference; a spiral ladder refers to a staircase on the same floor that requires multiple turns when walking, and a spiral ladder can reduce the slope of the ladder.

[0003] A Chinese patent with the announcement number CN214532098U discloses a vertically segmented, combined, rotating ladder comprising multiple ladder units and multiple connecting platforms. One side of the connecting platform is detachably connected to a wall, and the other side of the connecting platform is detachably connected to two adjacent ladder units. The ladder units comprise two side panels and multiple ladder treads. The adjacent sides of the two side panels each have multiple slots for the ladder treads to be placed. The multiple slots are parallel to each other, and the side panels are also provided with limiters for securing the ladder treads. The connecting platform is provided to connect two adjacent ladder units, and the connecting platform is detachably mounted on the wall. The ladder units further comprise two side panels and multiple ladder treads. The multiple ladder treads are detachably mounted between the two side panels, making the entire ladder unit a detachable structure, which facilitates disassembly.

[0004] In the current existing technology, the above-mentioned vertical segmented combined rotating ladder has the advantage of being easy to install and disassemble, but the ladder requires a large vertical projection space, and its side and rear areas are difficult to effectively utilize, resulting in space waste and affecting the functional layout.

[0005] To this end, the present invention provides a rotary ladder. Summary of the Invention

[0006] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the ladder occupies a large vertical projection space, and its side and rear areas are difficult to effectively utilize, resulting in space waste and affecting the functional layout.

[0007] In order to solve the above technical problems, the present invention provides a rotary ladder, including a chassis, a base is installed on the chassis through an installation mechanism, and a pillar is welded on the base, wherein a plurality of pillars are provided, and two adjacent pillars are threadedly connected by a threaded rod; a plurality of sleeves are provided on the pillars through a limiting rod sleeve, and step plates are welded on the side walls of the sleeves, and the plurality of step plates are evenly distributed spirally around the pillars, the width of the step plate close to the end of the pillar is smaller than the end away from the pillar, and two adjacent step plates form an ascending angle of 19°; the top of the step plate is installed with a guardrail through a limiting assembly, and two spiral handrails are welded to the plurality of guardrails.

[0008] In one embodiment of the present invention, the top of the step plate is fixed with a limit block, the bottom of the step plate is fixed with a fixed column, and the limit blocks are inserted into adjacent fixed columns; a pressure sensor is provided at the connection between the limit blocks and the fixed columns.

[0009] In one embodiment of the present invention, the limiting assembly includes an insertion rod fixed to the top of the step plate, two sliding grooves are symmetrically opened at the top of the insertion rod, trapezoidal blocks are slidably connected in the sliding grooves, two springs are fixed between the trapezoidal blocks and the inner walls of the sliding grooves, and slots are opened at the bottom of the guardrail, and the trapezoidal blocks are inserted in the slots.

[0010] In one embodiment of the present invention, the mounting mechanism includes a cavity opened inside the base, a gear ring is rotatably connected to the inner wall of the cavity via a bearing, four gear columns are rotatably connected to the inner wall of the cavity via a rotating shaft, and the gear columns are all engaged with the gear ring; four racks are slidably connected to the bottom inner wall of the cavity, and the racks are respectively engaged with adjacent gear columns; the bottoms of the racks are fixed with L-shaped plugs, and the chassis is fixed with limiting slots, and the L-shaped plugs are all inserted into the limiting slots; a first motor is provided at the top of one of the rotating shafts.

[0011] In one embodiment of the present invention, four sliding openings are formed at the bottom of the base, and the L-shaped inserts are all slidably connected in the sliding openings.

[0012] In one embodiment of the present invention, a connecting column is fixed to the bottom of the lowest step plate, and the bottom of the connecting column is fixed to the top of the chassis.

[0013] In one embodiment of the present invention, an LED light string is provided on the outside of the sleeve, and the LED light string is spirally wound on the outside of the sleeve; a solar panel is installed on the top of the pillar, and an energy storage mechanism is fixedly connected to the rear wall of the solar panel, and the energy storage mechanism is electrically connected to the LED light string.

[0014] In one embodiment of the present invention, a side plate is fixedly connected to the top side wall of the pillar, a second motor is fixedly connected to the top of the side plate, and a first gear is fixedly connected to the output shaft of the second motor; a connecting plate is rotatably connected to the pillar through a rotating tube, the solar panel is fixed to the side wall of the connecting plate, a second gear is fixedly connected to the outer wall of the rotating tube, and the first gear is meshed with the second gear.

[0015] In one embodiment of the present invention, the step plate is made of one of corrugated steel, carbon fiber composite material or aluminum alloy.

[0016] In one embodiment of the present invention, a vibration sensor is fixed to the bottom of each step plate; a warning light is provided on the spiral handrail, and the vibration sensor is electrically connected to the warning light.

[0017] The above technical solution of the present invention has the following advantages over the prior art:

[0018] The rotating ladder described in the present invention is made of a base, pillars and step plates. The step plates are made of non-slip corrugated steel plates. A 19° rising angle is formed between adjacent steps, which are spirally distributed around the pillars. Ladder guardrails and spiral handrails are welded to the edges. This structure reduces the horizontal projection area by rotating the ascending path, thereby improving space utilization. The rotating design of the ladder body realizes dynamic space utilization, greatly reducing the ladder's occupation of surrounding space while ensuring safety.

[0019] The rotary ladder described in the present invention cooperates with a gear ring, a gear column and a rack, and by placing the base on the top of the chassis accordingly, turning on the first motor, and driving the rotating shaft to rotate through the output shaft of the first motor, driving the connected gear column to rotate through the rotating shaft, driving the gear ring to rotate through the gear column, and driving the other three gear columns to rotate through the gear ring, and releasing two to achieve synchronous rotation of the four gear columns, driving the rack to move through the gear column, and driving the L-shaped plug to move through the rack, the L-shaped plug is inserted into the limit groove, and the base and chassis are fixed together to achieve installation of the base and the pillar. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a perspective view of the present invention;

[0022] Figure 2 It is an exploded view of the step plate and the fixed column in the present invention;

[0023] Figure 3 is a cross-sectional view of the guardrail of the present invention;

[0024] Figure 4 is a three-dimensional diagram of the sleeve in the present invention;

[0025] Figure 5 is a three-dimensional diagram of the L-shaped plug in the present invention;

[0026] Figure 6 It is a three-dimensional diagram of the gear ring and the gear column in the present invention;

[0027] Figure 7 is a perspective view of the first gear and the second gear in the present invention;

[0028] Explanation of the reference numerals in the specification: 1. chassis; 2. base; 21. pillar; 22. sleeve; 23. threaded rod; 3. step plate; 31. guardrail; 32. fixing column; 33. connecting column; 34. limit block; 35. plug-in rod; 36. trapezoidal block; 37. spring; 38. spiral handrail; 4. first motor; 41. L-shaped plug-in block; 42. sliding mouth; 43. rack; 44. gear column; 45. gear ring; 5. LED light string; 6. solar panel; 61. energy storage mechanism; 62. side panel; 63. second motor; 64. first gear; 65. connecting plate; 66. second gear. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0030] See also Figure 1 - Figure 7 The present invention provides a rotary ladder, comprising a chassis 1, a base 2 being mounted on the chassis 1 through a mounting mechanism, a pillar 21 being welded to the base 2, wherein a plurality of pillars 21 are provided, and two adjacent pillars 21 are threadedly connected by a threaded rod 23; a plurality of sleeves 22 are provided on the pillars 21 through a limiting rod sleeve, and a step plate 3 is welded on the side wall of the sleeve 22, and the plurality of step plates 3 are evenly distributed spirally around the pillars 21, and the width of the step plate 3 is smaller at the end close to the pillar 21 than at the end away from the pillar 21, and an ascending angle of 19° is formed between two adjacent step plates 3; a guardrail 31 is mounted on the top of each step plate 3 through a limiting assembly, and two spiral handrails 38 are welded together on the plurality of guardrails 31.

[0031] A staircase is a component used for vertical transportation between floors in a building, and is used for transportation between floors or when there is a large height difference. A spiral staircase refers to a staircase that requires multiple turns when walking on the same floor. A spiral staircase can reduce the slope of the staircase. When in use, the stair plate 3 provided by the present invention is composed of a base 2, a support 21 and a stair plate 3. The stair plate 3 is made of anti-slip corrugated steel plate, and an ascending angle of 19° is formed between adjacent steps. The stair plate 3 is spirally distributed around the support 21, and a ladder guardrail 31 and a spiral handrail 38 are welded to the edge. This structure reduces the horizontal projection area by rotating the ascending path, thereby improving space utilization. The rotating design of the ladder body realizes dynamic space utilization, while ensuring safety. At the same time, it greatly reduces the occupation of the surrounding space by the ladder.

[0032] The support 21 is connected by a threaded rod 23, which makes it easy to adjust the height of the support 21. The sleeve 22 and the limiting rod slide together to limit one end of the step plate 3 to prevent sliding.

[0033] Furthermore, if Figure 2 As shown, the top of the step plate 3 is fixed with a limit block 34, the bottom of the step plate 3 is fixed with a fixed column 32, and the limit blocks 34 are inserted into adjacent fixed columns 32; pressure sensors are provided at the connection between the limit blocks 34 and the fixed columns 32.

[0034] When the limit block 34 provided by the present invention is in use, one end of the step plate 3 slides through the sleeve 22 and the limit rod to limit one end of the step plate 3 to prevent sliding; the other end of the step plate 3 slides through the fixed column 32 and the limit block 34 to prevent the other end of the step plate 3 from sliding, thereby fixing the step plate 3. A pressure sensor is provided at the connection between the limit block 34 and the fixed column 32 to facilitate monitoring the pressure of the step plate 3. When the pressure plate is greater than the set value, the weight is reduced in time to prevent damage to the step plate 3 and cause installation hazards.

[0035] Furthermore, if Figure 3 As shown, the limiting assembly includes an insertion rod 35 fixed to the top of the step plate 3, and two sliding grooves are symmetrically opened at the top of the insertion rod 35. Trapezoidal blocks 36 are slidably connected in the sliding grooves, and two springs 37 are fixed between the trapezoidal blocks 36 and the inner wall of the sliding grooves. The bottom of the guardrail 31 is provided with a slot, and the trapezoidal blocks 36 are inserted in the slots.

[0036] When the limiting assembly provided by the present invention is in use, by inserting the guardrail 31 on the outside of the insertion rod 35, during the insertion process, the guardrail 31 presses the trapezoidal block 36, the trapezoidal block 36 slides inward, and the spring 37 is compressed until the slot moves to one side of the trapezoidal block 36. Under the action of the spring 37, the trapezoidal block 36 quickly resets to achieve the maximum limit of the guardrail 31, and the connection between the guardrail 31 and the step plate 3 can also be reinforced by welding to ensure the stability of the guardrail 31.

[0037] Furthermore, if Figure 5 and Figure 6 As shown, the mounting mechanism includes a cavity opened inside the base 2, and a gear ring 45 is rotatably connected to the inner wall of the cavity through a bearing, and four gear columns 44 are rotatably connected to the inner wall of the cavity through a rotating shaft, and the gear columns 44 are all engaged with the gear ring 45; four racks 43 are slidably connected to the bottom inner wall of the cavity, and the racks 43 are respectively engaged with adjacent gear columns 44; the bottoms of the racks 43 are fixed with L-shaped plugs 41, and the chassis 1 is fixed with limiting grooves, and the L-shaped plugs 41 are all inserted in the limiting grooves; a first motor 4 is provided at the top of one of the rotating shafts.

[0038] The mounting mechanism provided by the application needs to fix the base plate 1 and the base 2 when in use, the base 2 is placed on the top of the base plate 1, the first motor 4 is started, the output shaft of the first motor 4 drives the rotating shaft to rotate, the rotating shaft drives the connected tooth column 44 to rotate, the tooth column 44 drives the tooth ring 45 to rotate, the tooth ring 45 drives the other three tooth columns 44 to rotate, and the synchronous rotation of the four tooth columns 44 is realized, the tooth column 44 drives the rack 43 to move, the rack 43 drives the L-shaped plug block 41 to move, the L-shaped plug block 41 is inserted into the limiting groove, the base 2 and the base plate 1 are fixed together, and the installation of the base 2 and the support column 21 is realized.

[0039] Further, as shown in Figure 5 The bottom of the base 2 is provided with four sliding openings 42, and the L-shaped plug block 41 is slidably connected in the sliding opening 42.

[0040] The sliding opening 42 provided by the application is used in the movement process of the L-shaped plug block 41, the L-shaped plug block 41 slides in the sliding opening 42, and the sliding opening 42 limits the horizontal movement of the L-shaped plug block 41.

[0041] Further, as shown in Figure 1 The bottom of the lowermost one of the stepped plates 3 is fixedly connected with a connecting column 33, and the bottom of the connecting column 33 is fixedly connected to the top of the base plate 1.

[0042] The connecting column 33 provided by the application is used to support and reinforce the top stepped plate 3 in use, thereby improving the stability of the stepped plate 3.

[0043] Further, as shown in Figure 1 The outer side of the sleeve 22 is provided with an LED lamp string 5, the LED lamp string 5 is spirally wound on the outer side of the sleeve 22, the top of the support column 21 is provided with a solar panel 6, the rear wall of the solar panel 6 is fixedly connected with an energy storage mechanism 61, and the energy storage mechanism 61 is electrically connected with the LED lamp string 5.

[0044] The LED lamp string 5 provided by the application is used for lighting the stepped plate 3 in use, the LED lamp string 5 is spirally wound on the outer side of the sleeve 22 to ensure that the light uniformly covers the entire rotating path, the spiral handrail 38 is further provided with a human body infrared sensor and a light sensor, the human body infrared sensor is used to automatically turn on the light when a person approaches the ladder, and the light is automatically turned off after the person leaves, thereby avoiding manual operation, and the brightness or the light is automatically adjusted according to the ambient light intensity.

[0045] Further, as shown in Figure 7As shown, a side plate 62 is fixedly connected to the top side wall of the pillar 21, a second motor 63 is fixedly connected to the top of the side plate 62, and a first gear 64 is fixedly connected to the output shaft of the second motor 63; a connecting plate 65 is rotatably connected to the pillar 21 through a rotating tube, the solar panel 6 is fixedly connected to the side wall of the connecting plate 65, and a second gear 66 is fixedly connected to the outer wall of the rotating tube, and the first gear 64 is meshed with the second gear 66.

[0046] When in use, the first gear 64 and the second gear 66 provided by the present invention are used to supplement power for the LED light string 5 by setting a solar panel 6, and are equipped with a lithium battery pack energy storage mechanism 61 to store electrical energy for powering the battery; in order to improve the power storage capacity of the solar panel 6, the solar panel 6 needs to rotate with the rotation of the sun, and by turning on the second motor 63, the first gear 64 is driven to rotate by the output shaft of the second motor 63, and the second gear 66 is driven to rotate by the first gear 64, and the rotating tube is driven to rotate by the second gear 66, and the connecting plate 65 is driven to rotate by the rotating tube, and the solar panel 6 is driven to rotate by the connecting plate 65, thereby improving the absorption rate of solar energy.

[0047] Furthermore, if Figure 1 As shown, the material of the step plate 3 is one of corrugated steel, carbon fiber composite material or aluminum alloy.

[0048] Example 1:

[0049] The step plate 3 is made of anti-slip corrugated steel plate, has a length of 650 mm, and a width gradually changing from 100 mm to 350 mm. Adjacent steps form a 19° rising angle and are spirally distributed around the pillars 21.

[0050] Example 2:

[0051] The step plate 3 is made of carbon fiber composite material, with a length of 650mm and a width gradually changing from 100mm to 350mm. Adjacent steps form a 19° rising angle and are spirally distributed around the pillars 21. The step surface is coated with an anti-slip nano-coating.

[0052] Example 3:

[0053] The step plate 3 is made of aluminum alloy, has a length of 650 mm, and a width gradually changing from 100 mm to 350 mm. Adjacent steps form a 19° rising angle and are spirally distributed around the pillars 21. The step surface is coated with an anti-slip nano-coating.

[0054] By adopting the step plate 3 made of carbon fiber composite material, the weight is reduced while the bending resistance is maintained.

[0055] Furthermore, if Figure 1The bottom of the step plate 3 is fixed with a vibration sensor, and the spiral handrail 38 is provided with a warning light, and the vibration sensor is electrically connected with the warning light.

[0056] The vibration sensor provided by the application can trigger an alarm and make the warning light flash when the ladder shakes violently due to a collision.

[0057] Working principle: the ladder is a component used for vertical traffic between floors in a building, and is used for traffic connection between floors and when the height difference is large; the rotating ladder refers to a staircase that needs to be turned multiple times when walking in the same floor, and the rotating ladder can reduce the slope of the ladder; the step plate 3 provided by the application is used in the rotating ladder, which is composed of the base 2, the support column 21 and the step plate 3; the step plate 3 is made of anti-skid corrugated steel plate, and a 19° upward included angle is formed between adjacent steps, and is spirally distributed around the support column 21; the ladder guard 31 and the spiral handrail 38 are welded on the edge; this structure reduces the horizontal projection area through the rotating upward path, improves the space utilization rate, realizes dynamic utilization of space through the rotating design of the ladder body, and greatly reduces the occupation of the surrounding space by the ladder while ensuring safety.

[0058] One end of the step plate 3 is limited by the sleeve 22 and the limiting rod, and the other end of the step plate 3 is limited by the fixed column 32 and the limiting block 34, so as to prevent the step plate 3 from sliding; the connection between the limiting block 34 and the fixed column 32 is provided with a pressure sensor, so as to facilitate monitoring the pressure of the step plate 3; when the pressure is greater than a set value, the weight is reduced in time, so as to prevent damage to the step plate 3 and cause safety hazards.

[0059] When it is necessary to fix the base plate 1 and the base 2, the base 2 is placed on the top of the base plate 1, the first motor 4 is started, the output shaft of the first motor 4 drives the rotating shaft to rotate, the connected tooth column 44 rotates, the tooth ring 45 rotates, the other three tooth columns 44 rotate, the synchronous rotation of the four tooth columns 44 is realized, the tooth column 44 drives the tooth bar 43 to move, the L-shaped insertion block 41 moves, the L-shaped insertion block 41 is inserted into the limiting groove, the base 2 and the base plate 1 are fixed together, and the installation of the base 2 and the support column 21 is realized.

[0060] The LED light string 5 is spirally wound around the outside of the sleeve 22 to ensure that the light evenly covers the entire rotation path. The spiral handrail 38 is also equipped with a human infrared sensor and a light sensor. The human infrared sensor is used to automatically turn on the light when someone approaches the ladder and delay turning off the light after leaving, avoiding manual operation. The brightness or light switch is automatically adjusted according to the ambient light intensity. A solar panel 6 is provided to supplement the power for the LED light string 5, and a lithium battery pack energy storage mechanism 61 is provided to store electrical energy for battery power. In order to improve the power storage capacity of the solar panel 6, the solar panel 6 needs to rotate with the rotation of the sun. By turning on the second motor 63, the output shaft of the second motor 63 drives the first gear 64 to rotate, the first gear 64 drives the second gear 66 to rotate, the second gear 66 drives the rotating tube to rotate, the rotating tube drives the connecting plate 65 to rotate, and the connecting plate 65 drives the solar panel 6 to rotate, thereby improving the absorption rate of solar energy.

[0061] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A rotary ladder, comprising a chassis (1), a base (2) mounted on the chassis (1) via a mounting mechanism, a support (21) welded to the base (2), wherein a plurality of supports (21) are provided, and two adjacent supports (21) are threadedly connected via a threaded rod (23); a plurality of sleeves (22) are provided on the supports (21) via a limiting rod sleeve, and the ladder is characterized in that: A step plate (3) is welded on the side wall of the sleeve (22), and a plurality of the step plates (3) are evenly distributed in a spiral around the pillar (21). The width of the step plate (3) at one end close to the pillar (21) is smaller than that at the other end away from the pillar (21), and two adjacent step plates (3) form an ascending angle of 19°; a guardrail (31) is installed on the top of each step plate (3) through a limiting assembly, and two spiral handrails (38) are welded together on the plurality of guardrails (31).

2. A rotary ladder according to claim 1, characterized in that: The top of each step plate (3) is fixedly connected to a limit block (34), the bottom of each step plate (3) is fixedly connected to a fixed column (32), and each limit block (34) is inserted into an adjacent fixed column (32); and a pressure sensor is provided at the connection between each limit block (34) and the fixed column (32).

3. A rotary ladder according to claim 2, characterized in that: The limiting assembly includes an insertion rod (35) fixedly connected to the top of the step plate (3), two sliding grooves are symmetrically provided at the top of the insertion rod (35), a trapezoidal block (36) is slidably connected in the sliding groove, two springs (37) are fixedly connected between the trapezoidal block (36) and the inner wall of the sliding groove, and a slot is provided at the bottom of the guardrail (31), and the trapezoidal block (36) is inserted in the slot.

4. A rotary ladder according to claim 3, characterized in that: The mounting mechanism comprises a cavity opened inside the base (2); a gear ring (45) is rotatably connected to the inner wall of the cavity via a bearing; four gear posts (44) are rotatably connected to the inner wall of the cavity via a rotating shaft; the gear posts (44) are all engaged with the gear ring (45); four racks (43) are slidably connected to the inner wall of the bottom of the cavity; the racks (43) are respectively engaged with adjacent gear posts (44); the bottoms of the racks (43) are fixed with L-shaped plugs (41); the chassis (1) is fixed with limiting grooves, and the L-shaped plugs (41) are all inserted into the limiting grooves; a first motor (4) is provided at the top of one of the rotating shafts.

5. The rotary ladder according to claim 4, characterized in that: Four sliding openings (42) are provided at the bottom of the base (2), and the L-shaped plug-in blocks (41) are all slidably connected in the sliding openings (42).

6. The rotary ladder according to claim 5, characterized in that: A connecting column (33) is fixed to the bottom of the lowest step plate (3), and the bottom of the connecting column (33) is fixed to the top of the chassis (1).

7. The rotary ladder according to claim 6, characterized in that: An LED light string (5) is provided on the outside of the sleeve (22), and the LED light string (5) is spirally wound on the outside of the sleeve (22); a solar panel (6) is installed on the top of the support (21), and an energy storage mechanism (61) is fixedly connected to the rear wall of the solar panel (6), and the energy storage mechanism (61) is electrically connected to the LED light string (5).

8. The rotary ladder according to claim 7, characterized in that: A side plate (62) is fixedly connected to the top side wall of the pillar (21), a second motor (63) is fixedly connected to the top of the side plate (62), and a first gear (64) is fixedly connected to the output shaft of the second motor (63); a connecting plate (65) is rotatably connected to the pillar (21) through a rotating tube, the solar panel (6) is fixedly connected to the side wall of the connecting plate (65), a second gear (66) is fixedly connected to the outer wall of the rotating tube, and the first gear (64) is meshed with the second gear (66).

9. The rotary ladder according to claim 8, characterized in that: The material of the step plate (3) is one of corrugated steel, carbon fiber composite material or aluminum alloy.

10. The rotary ladder according to claim 9, characterized in that: The bottom of each step plate (3) is fixedly connected with a vibration sensor; a warning light is provided on the spiral handrail (38), and the vibration sensor is electrically connected to the warning light.

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