Pyramid-shaped rigid protective cage for elevator shaft opening

Abstract

The invention relates to the field of building construction elevator shaft opening protection, which comprises a bottom quadrilateral frame, a plurality of edge quadrilateral frames are arranged at the top of the bottom quadrilateral frame, a plurality of inclined main ribs are fixed between the bottom quadrilateral frame and the plurality of edge quadrilateral frames, and a reinforced bearing column is arranged in the middle of the bottom quadrilateral frame. A plurality of cross-shaped reinforcing ribs are fixed to the peripheral face of the reinforcing bearing column, one end of each cross-shaped reinforcing rib is fixed to the surface of the bottom quadrilateral frame, a U-shaped hoisting hole is fixed to the top of each cross-shaped reinforcing rib, and one end of each oblique main rib is fixed to the surface of the corresponding U-shaped hoisting hole. The bottom quadrilateral frame, the inclined main ribs and the cross-shaped reinforcing ribs are made of deformed steel bars; the pyramid-shaped three-dimensional truss and all-welded integrated structure is adopted, vertical impact can be converted into diagonal bracing axial pressure, the anti-rollover capacity and the anti-deviation capacity are outstanding, heavy object falling can be borne, damage is avoided, and severe construction environments can be resisted.

Description

Technical Field

[0001] This application relates to the field of elevator shaft protection in building construction, and in particular to a pyramid-shaped rigid protective cage for elevator shaft openings. Background Technology

[0002] During construction, elevator shafts are one of the major hazards on site, and accidents involving falling personnel or materials are very likely to occur, making safety protection of paramount importance.

[0003] Currently, common protective methods involve laying flat protective covers or erecting straight guardrails above the opening. These traditional methods have many drawbacks. Flat covers are easily moved or damaged and have no obvious warning effect; straight guardrails lack stability and may fail and collapse when subjected to lateral impact; in addition, both methods lack a three-dimensional warning effect and still pose safety hazards in poor lighting conditions.

[0004] Therefore, there is an urgent need for a new type of protective device that is structurally stable, highly warning, and not easily moved. Summary of the Invention

[0005] This application is designed for the protection of elevator shaft openings in building construction and is also compatible with vertical openings such as pipe shafts. Its unique pyramid structure effectively prevents personnel and materials from falling, eliminating the risk of falls from heights into elevator shafts. The rigid, fully reinforced welded structure provides load-bearing and impact resistance far exceeding traditional cover plates, capable of withstanding heavy impacts without deformation, making it suitable for high-load applications in shaft openings. Furthermore, its three-dimensional shape and highly visible warning coating provide multi-angle, long-distance alerts to personnel and equipment to avoid dangerous areas in elevator shafts. The welded lifting holes allow for quick assembly, disassembly, and relocation with tower cranes and other equipment. Standardized production according to common shaft opening dimensions improves efficiency and reduces costs. The grid structure balances protection and ventilation, allowing for ventilation to prevent gas accumulation and introducing light, facilitating operations within the elevator shaft. The entire system integrates rigid protection, active warning, and convenient relocation, providing comprehensive safety protection for building elevator shafts and similar vertical openings, offering a pyramid-shaped rigid protective cage for elevator shafts.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: A pyramid-shaped rigid protective cage for elevator shaft openings includes a bottom quadrilateral frame, multiple side quadrilateral frames on the top of the bottom quadrilateral frame, multiple diagonal main ribs fixed between the bottom quadrilateral frame and the multiple side quadrilateral frames, a reinforcing load-bearing column at the middle position of the bottom quadrilateral frame, multiple cross reinforcing ribs fixed on the outer periphery of the reinforcing load-bearing column, one end of the cross reinforcing ribs being fixed to the surface of the bottom quadrilateral frame, a U-shaped hoisting hole fixed on the top of the cross reinforcing ribs, and one end of the diagonal main ribs being fixed to the surface of the U-shaped hoisting hole. The outer surfaces of the bottom quadrilateral frame, the side quadrilateral frame, and the diagonal main reinforcement are coated with a warning coating. The bottom quadrilateral frame, the side quadrilateral frame, the diagonal main reinforcement, and the cross reinforcement are made of threaded steel.

[0007] Preferably, the warning coating is made of warning paint material and the coating thickness is not less than 0.5 mm.

[0008] Preferably, it further includes a reinforcement component acting on the reinforced load-bearing column. The reinforcement component includes a movable seat disposed at the bottom of the reinforced load-bearing column, a first threaded rod rotatably connected to both sides of the inner cavity of the movable seat, a first threaded sleeve threadedly connected to the outer circumferential surface of the first threaded rod, a pin fixed to the two first threaded sleeves on opposite sides, a guide bar inserted through the upper and lower ends of the first threaded sleeve, and a rotating component acting on the first threaded rod. The pin is slidably inserted into both sides of the movable seat, and the opposite ends of the two adjacent guide bars are fixed to the inner wall of the movable seat.

[0009] Preferably, the rotating component includes a motor fixed to the top of the inner cavity of the reinforcing load-bearing column, a connecting shaft fixed to the output end of the motor, a sleeve sleeved on the outer circumferential surface of the connecting shaft, a first bevel gear fixedly sleeved on the bottom of the outer circumferential surface of the sleeve, a second bevel gear fixedly sleeved on the outer circumferential surface of the first threaded rod near the position of the first bevel gear, two grooves formed on the outer circumferential surface of the connecting shaft, and an abutting block inserted into the inner cavity of the groove.

[0010] Preferably, the two abutting blocks are fixed to the inner circumferential surface of the sleeve on the side that is far apart from each other, the first bevel gear is meshed with the two second bevel gears, and the sleeve is rotatably connected to the inner wall of the movable seat.

[0011] Preferably, the reinforcement assembly further includes a support plate fixed at the middle position of the inner cavity of the movable seat, a second threaded rod rotatably connected to one side of the bottom of the support plate, a limiting shaft fixed to the other side of the bottom of the support plate, a second threaded sleeve threadedly connected to the outer circumferential surface of the second threaded rod, a limiting sleeve slidably sleeved on the outer circumferential surface of the limiting shaft, an adjusting component acting on the second threaded rod, and clamping rings fixed to the outer circumferential surface of the sleeve near the upper and lower ends of the second threaded sleeve.

[0012] Preferably, one side of the limiting sleeve is fixed to the outer peripheral surface of the sleeve, one side of the second threaded sleeve is fixed to the outer peripheral surface of the sleeve, one end of the two clamping rings is close to each other and fits against the surfaces of the second threaded sleeve and the limiting sleeve, the second threaded sleeve is fixed to the surface of one end of the limiting shaft, and the connecting shaft and the support plate are configured to be rotatably connected through each other.

[0013] Preferably, the adjusting component includes a hydraulic cylinder fixed to one side of the top of the support plate, a collar sleeved on the outer circumferential surface of the connecting shaft, a connecting shaft fixed to one side of the bottom of the collar, and a circular gear fixedly sleeved on the connecting shaft at a position close to the outer circumferential surface of the rotating cylinder. The connecting shaft is slidably inserted into the top of the inner wall of the rotating cylinder, and the two circular gears are meshed together. The output end of the hydraulic cylinder is fixed to the other side of the bottom of the collar.

[0014] Preferably, the adjusting component further includes a rotating cylinder rotatably connected to one side of the top of the support plate, two embedded shafts fixed to the inner cavity of the rotating cylinder, a magnetic suction seat slidably sleeved on the outer circumferential surface of the two embedded shafts, a magnetic suction groove formed at the top of the second threaded rod, and a spring fixed to the top of the magnetic suction seat. One end of the spring is fixed to the top of the inner wall of the rotating cylinder, and one end of the magnetic suction seat passes through the rotating cylinder and the support plate and extends into the interior of the magnetic suction groove.

[0015] In summary, this application has the following technical effects: 1. More stable structure and stronger impact resistance: Compared with the existing planar protection which is prone to deformation and relies on adjustable parts which are prone to loosening, this application adopts a pyramid-shaped three-dimensional truss + fully welded integrated structure, which can convert vertical impact into diagonal bracing axial pressure, with outstanding anti-overturning and anti-displacement capabilities, can withstand heavy objects falling without damage, and can also withstand harsh construction environments.

[0016] 2. Excellent reusability and outstanding economy: Existing protective equipment is easily damaged by on-site welding and can only be used once. The modular prefabrication design of this application enables non-destructive assembly and disassembly. A single set can be reused multiple times, which greatly reduces material waste and construction costs. The assembly and disassembly efficiency is also much higher than that of traditional methods.

[0017] 3. Efficient installation and dismantling without affecting construction progress: Traditional protective installation and dismantling is time-consuming. This application uses prefabricated integral components with welding and fixing hoisting holes on the top, which can be quickly installed and dismantled without mechanical assistance, effectively ensuring the continuity of construction progress.

[0018] 4. Clear warnings and good durability: Existing protective warnings are blurry and prone to rust. This application uses high-visibility warning paint and professional anti-corrosion treatment, which has a long service life and can reduce later maintenance costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 from the front view; Figure 2 This is a structural schematic diagram of Embodiment 1 from the front view; Figure 3 This is a top view of the structure of Embodiment 1; Figure 4This is a schematic cross-sectional view of the three-dimensional structure in the front view of Embodiment 2; Figure 5 It is in this application Figure 4 Enlarged structural diagram at point A; Figure 6 It is in this application Figure 4 Enlarged structural diagram at point B; Figure 7 It is in this application Figure 4 Enlarged structural diagram at point C; Figure 8 It is in this application Figure 4 Enlarged structural diagram at point D; Figure 9 This is a three-dimensional structural diagram of a partial structure of Embodiment 2.

[0020] In the diagram: 1. Bottom quadrilateral frame; 2. Side quadrilateral frame; 3. Diagonal main rib; 4. Reinforced load-bearing column; 5. Cross-shaped reinforcing rib; 6. U-shaped hoisting hole; 7. Warning coating; 8. Movable seat; 9. Sleeve; 10. First bevel gear; 11. First threaded rod; 12. Second bevel gear; 13. Guide bar; 14. First threaded sleeve; 15. Pin; 16. Motor; 17. Connecting shaft; 18. Second threaded rod; 19. Second threaded sleeve; 20. Limiting shaft; 21. Limiting sleeve; 22. Groove; 23. Abutment block; 24. Support plate; 25. Collar; 26. Hydraulic cylinder; 27. Rotating cylinder; 28. Embedded shaft; 29. ​​Magnetic seat; 30. Magnetic groove; 31. Spring; 32. Connecting shaft; 33. Circular gear; 34. Clamping ring. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1 Reference Figure 1 —3, including a bottom quadrilateral frame 1, a number of side quadrilateral frames 2 on the top of the bottom quadrilateral frame 1, a number of diagonal main ribs 3 fixed between the bottom quadrilateral frame 1 and the number of side quadrilateral frames 2, a reinforced load-bearing column 4 at the middle position of the bottom quadrilateral frame 1, a number of cross reinforcing ribs 5 fixed on the outer periphery of the reinforced load-bearing column 4, one end of the cross reinforcing rib 5 fixed to the surface of the bottom quadrilateral frame 1, a U-shaped hoisting hole 6 fixed on the top of the cross reinforcing rib 5, and one end of the diagonal main rib 3 fixed to the surface of the U-shaped hoisting hole 6; The outer surfaces of the bottom quadrilateral frame 1, the side quadrilateral frame 2, and the diagonal main rib 3 are coated with a warning coating 7. The bottom quadrilateral frame 1, the side quadrilateral frame 2, the diagonal main rib 3, and the cross reinforcing rib 5 are made of threaded steel. The warning coating 7 is made of warning paint material and the coating thickness is not less than 0.5mm.

[0023] This application requires the fabrication of a bottom quadrilateral frame 1 of corresponding dimensions according to the design dimensions and the elevator shaft opening dimensions. The bottom quadrilateral frame 1 shall be made of 12mm diameter threaded steel, the side quadrilateral frames 2 shall be made of 8mm diameter threaded steel, and the diagonal main reinforcement 3 shall be made of 12mm diameter threaded steel. Both ends of the reinforcement 5 shall be welded and fixed to the bottom quadrilateral frame 1, the side quadrilateral frames 2, and the U-shaped lifting holes 6. The cross reinforcing ribs 5 shall be made of 12mm diameter threaded steel and welded to the reinforcing load-bearing columns 4 for reinforcement. The top shall be welded and reinforced at the intersection with the diagonal main reinforcement 3. The installation process is as follows: 1. Hoist the prefabricated protective device to the top of the elevator shaft through the U-shaped hoisting hole 6; 2. Adjust the position so that the bottom quadrilateral frame 1 is on the wellhead edge component; 3. Check the overall stability of the protective structure, ensure that all connections are secure, and complete the installation. 4. After the construction of the wellhead is completed, the protective device can be lifted off as a whole through the U-shaped lifting hole 6 and transferred to the next target elevator wellhead for reuse. The entire process does not require disassembly of components, avoiding structural damage and achieving efficient recycling.

[0024] Compared to traditional methods such as laying flat protective covers or erecting straight protective railings above openings, the use of a pyramid-shaped three-dimensional truss + fully welded integrated structure can convert vertical impact into axial pressure of diagonal bracing, with outstanding resistance to overturning and displacement, can withstand heavy objects falling without damage, and can also withstand harsh construction environments, with the characteristics of more stable structure and stronger impact resistance. Furthermore, it boasts superior reusability and economic efficiency. Existing protective devices are prone to damage due to on-site welding and can only be used once. This application achieves non-destructive assembly and disassembly through modular prefabrication design, allowing a single set to be reused multiple times, significantly reducing material waste and construction costs. The assembly and disassembly efficiency is also far higher than that of traditional methods.

[0025] Efficient installation and dismantling without affecting construction progress: Traditional protective installation and dismantling is time-consuming. This application uses prefabricated integral components with welding and fixing hoisting holes on the top, which can be quickly installed and dismantled without mechanical assistance, effectively ensuring the continuity of construction progress.

[0026] Clear warnings and good durability: Existing protective warnings are blurry and prone to rust. This application uses high-visibility warning paint and professional anti-corrosion treatment, which has a long service life and can reduce later maintenance costs.

[0027] Example 2 Reference Figure 4—9, also includes a reinforcement component acting on the reinforced load-bearing column 4. The reinforcement component includes a movable seat 8 disposed at the bottom of the reinforced load-bearing column 4, a first threaded rod 11 rotatably connected to both sides of the inner cavity of the movable seat 8, a first threaded sleeve 14 threadedly connected to the outer circumferential surface of the first threaded rod 11, a pin 15 fixed to one side of the two first threaded sleeves 14 that are far apart from each other, a guide bar 13 inserted through the upper and lower ends of the first threaded sleeve 14, and a rotating component acting on the first threaded rod 11. The pin 15 is slidably inserted and connected to both sides of the movable seat 8, and the two adjacent guide bars 13 are fixed to the inner wall of the movable seat 8 at the ends that are far apart from each other. The rotating component enables the two first threaded rods 11 to rotate in opposite directions. Due to the resisting and limiting effect of the guide bar 13 on the first threaded sleeve 14, the first threaded sleeve 14 can only move in the horizontal direction. Thus, the first threaded sleeve 14 can move in a direction away from each other under the cooperation of the thread structure of its inner wall and the outer circumference of the first threaded rod 11. This allows the pin 15 to extend out of the movable seat 8 until it is embedded deep into the inner wall of the wellhead, thereby reinforcing the device and preventing it from shifting under the action of external wind force, which would lead to poor protection. This improves the applicability of the device.

[0028] Reference Figure 4 —9, the rotating component includes a motor 16 fixed to the top of the inner cavity of the reinforcing support column 4, a connecting shaft 17 fixed to the output end of the motor 16, a sleeve 9 sleeved on the outer circumferential surface of the connecting shaft 17, a first bevel gear 10 fixedly sleeved on the bottom of the outer circumferential surface of the sleeve 9, a second bevel gear 12 fixedly sleeved on the outer circumferential surface of the first threaded rod 11 near the position of the first bevel gear 10, two grooves 22 opened on the outer circumferential surface of the connecting shaft 17, and abutting blocks 23 inserted into the inner cavity of the grooves 22. The side of the two abutting blocks 23 that is far away from each other is fixed to the inner circumferential surface of the sleeve 9. The first bevel gear 10 and the two second bevel gears 12 are meshed and connected. The sleeve 9 is rotatably connected to the inner wall of the movable seat 8. By starting the motor 16, the connecting shaft 17 is rotated, which causes the sleeve 9 to rotate under the contact action between the inner wall of the groove 22 and the surface of the contact block 23. The rotation of the sleeve 9 drives the first bevel gear 10 to rotate, so that the two first threaded rods 11 can rotate synchronously and in opposite directions under the meshing action between the first bevel gear 10 and the second bevel gear 12.

[0029] Reference Figure 4—9, the reinforcement assembly also includes a support plate 24 fixed at the middle position of the inner cavity of the movable seat 8, a second threaded rod 18 rotatably connected to one side of the bottom of the support plate 24, a limiting shaft 20 fixed to the other side of the bottom of the support plate 24, a second threaded sleeve 19 threadedly connected to the outer peripheral surface of the second threaded rod 18, a limiting sleeve 21 slidably sleeved on the outer peripheral surface of the limiting shaft 20, an adjusting component acting on the second threaded rod 18, and clamping rings 34 fixed to the outer peripheral surface of the sleeve 9 near the upper and lower ends of the second threaded sleeve 19. One side of the limiting sleeve 21 is fixed to the outer peripheral surface of the sleeve 9, and one side of the second threaded sleeve 19 is fixed to the outer peripheral surface of the sleeve 9. The ends of the two clamping rings 34 that are close to each other are in contact with the surfaces of the second threaded sleeve 19 and the limiting sleeve 21. The surface of the second threaded sleeve 19 is fixed to one end of the limiting shaft 20. The connecting shaft 17 and the support plate 24 are configured to be rotatably connected through each other. By adjusting the components, the motor 16 can drive the second threaded rod 18 to rotate when it starts. Since the limiting sleeve 21 can only slide on the outer circumferential surface of the limiting shaft 20, the connection between the limiting sleeve 21 and the second threaded sleeve 19 can limit the movement trajectory of the second threaded sleeve 19, so that it can only move in the vertical direction. Thus, the second threaded sleeve 19 can move in the vertical direction under the cooperation of the thread structure of the second threaded rod 18 and the abutment of the second threaded sleeve 19 and the clamping ring 34. This allows the sleeve 9 to move in the vertical direction, thereby adjusting the height of the movable seat 8 and adjusting the depth of the pin 15 embedded in the inner wall of the wellhead. This makes it convenient for the user to adjust the reinforcement position according to the actual situation.

[0030] Reference Figure 4 —9, the adjusting components include a hydraulic cylinder 26 fixed to one side of the top of the support plate 24, a collar 25 sleeved on the outer circumferential surface of the connecting shaft 17, a connecting shaft 32 fixed to one side of the bottom of the collar 25, and a round gear 33 fixedly sleeved on the connecting shaft 17 at a position close to the outer circumferential surface of the rotating cylinder 27. The connecting shaft 32 is slidably inserted into the top of the inner wall of the rotating cylinder 27, and the two round gears 33 are meshed together. The output end of the hydraulic cylinder 26 is fixed to the other side of the bottom of the collar 25. By controlling the output end of the hydraulic cylinder 26, the collar 25 can move in the vertical direction, thereby allowing the connecting shaft 32 to extend in the vertical direction with the inner cavity of the rotating cylinder 27. When the connecting shaft 17 rotates, the rotating cylinder 27 can rotate under the meshing action between the two spur gears 33.

[0031] The adjustment components also include a rotating cylinder 27 rotatably connected to one side of the top of the support plate 24, two embedded shafts 28 fixed in the inner cavity of the rotating cylinder 27, a magnetic suction seat 29 slidably sleeved on the outer circumferential surface of the two embedded shafts 28, a magnetic suction groove 30 opened at the top of the second threaded rod 18, and a spring 31 fixed to the top of the magnetic suction seat 29. One end of the spring 31 is fixed to the top of the inner wall of the rotating cylinder 27, and one end of the magnetic suction seat 29 passes through the rotating cylinder 27 and the support plate 24 and extends into the interior of the magnetic suction groove 30. When the connecting shaft 32 moves vertically downwards, it abuts against the magnetic suction seat 29, causing it to move vertically downwards under the limiting action of the embedded shaft 28. This causes the spring 31 to deform until the bottom of the magnetic suction seat 29 passes through the rotating cylinder 27 and the support plate 24 and extends into the interior of the magnetic suction groove 30. Under the magnetic attraction between the magnetic suction seat 29 and the inner wall of the magnetic suction groove 30, the second threaded rod 18 can rotate. After the movable seat 8 has moved a certain distance into the wellhead, the output end of the hydraulic cylinder 26 is controlled to move the collar 25 vertically upwards. Under the restoring force of the spring 31, the magnetic suction seat 29 is reset, and the second threaded rod 18 stops rotating. This prevents the movable seat 8 from moving vertically, thus completing the height adjustment.

[0032] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An elevator shaft mouth pyramid type rigid protective cage, comprising a bottom quadrilateral frame (1), a plurality of side quadrilateral frames (2) provided on the top of the bottom quadrilateral frame (1), a plurality of inclined main bars (3) fixed between the bottom quadrilateral frame (1) and the plurality of side quadrilateral frames (2), a reinforced load-bearing column (4) provided at the middle position of the bottom quadrilateral frame (1), a plurality of cross reinforcing bars (5) fixed on the outer circumferential surface of the reinforced load-bearing column (4), one end of the cross reinforcing bars (5) fixed to the surface of the bottom quadrilateral frame (1), a U-shaped hoisting hole (6) fixed to the top of the cross reinforcing bars (5), and one end of the inclined main bars (3) fixed to the surface of the U-shaped hoisting hole (6). The outer surfaces of the bottom quadrilateral frame (1), the side quadrilateral frame (2) and the inclined main bars (3) are coated with a warning coating (7), and the bottom quadrilateral frame (1), the side quadrilateral frame (2), the inclined main bars (3) and the cross reinforcing bars (5) are made of threaded steel material.

2. An elevator shaft doorway pyramid rigid protective cage according to claim 1, characterized in that: The warning coating (7) is made of warning paint material, and the coating thickness is not less than 0.5mm.

3. An elevator shaft opening pyramid rigid protective cage according to claim 1, characterized in that: It also comprises a reinforcing assembly acting on the reinforced load-bearing column (4), which comprises a movable seat (8) provided at the bottom of the reinforced load-bearing column (4), a first threaded rod (11) rotatably connected to the inner cavities of the movable seat (8), a first threaded sleeve (14) threadedly connected to the outer circumferential surface of the first threaded rod (11), a latch (15) fixed to the sides of the two first threaded sleeves (14) away from each other, a guide strip (13) penetratingly inserted into the upper and lower ends of the first threaded sleeve (14), and a rotating component acting on the first threaded rod (11), the latch (15) and the movable seat (8) are slidably and insertingly connected, and one end of the guide strip (13) at two adjacent positions away from each other is fixed to the inner wall of the movable seat (8).

4. An elevator shaft doorway pyramidal rigid protective cage according to claim 3, characterized in that: The rotating component comprises a motor (16) fixed to the top of the inner cavity of the reinforced load-bearing column (4), a connecting shaft (17) fixed to the output end of the motor (16), a sleeve (9) sleeved on the outer circumferential surface of the connecting shaft (17), a first bevel gear (10) fixedly sleeved on the outer circumferential surface of the sleeve (9), a second bevel gear (12) fixedly sleeved on the outer circumferential surface of the first threaded rod (11) near the first bevel gear (10), two strip grooves (22) formed on the outer circumferential surface of the connecting shaft (17), and a resisting block (23) inserted into the inner cavity of the strip groove (22).

5. An elevator shaft doorway pyramidal rigid protective cage according to claim 4, characterized in that: One side of the two resisting blocks (23) away from each other is fixed to the inner circumferential surface of the sleeve (9), the first bevel gear (10) and the two second bevel gears (12) are in meshing connection, and the sleeve (9) and the inner wall of the movable seat (8) are in through rotary connection.

6. An elevator shaft doorway pyramidal rigid protective cage according to claim 4, characterized in that: The reinforcing assembly further comprises a support plate (24) fixed at the middle position of the inner cavity of the movable seat (8), a second threaded rod (18) rotatably connected to one side of the bottom of the support plate (24), a limiting shaft (20) fixed to the other side of the bottom of the support plate (24), a second threaded sleeve (19) threadedly connected to the outer periphery of the second threaded rod (18), a limiting sleeve (21) slidingly sleeved on the outer periphery of the limiting shaft (20), an adjusting component acting on the second threaded rod (18), and a clamping ring (34) fixed to the outer periphery of the sleeve (9) near the upper and lower ends of the second threaded sleeve (19).

7. An elevator shaft doorway pyramidal rigid protective cage according to claim 6, characterized in that: One side of the limiting sleeve (21) is fixed to the outer periphery of the sleeve (9), one side of the second threaded sleeve (19) is fixed to the outer periphery of the sleeve (9), the ends of the two clamping rings (34) close to each other are in contact with the surfaces of the second threaded sleeve (19) and the limiting sleeve (21), the second threaded sleeve (19) is fixed to the surface of one end of the limiting shaft (20), and the connecting shaft (17) and the support plate (24) are in through rotary connection.

8. An elevator shaft doorway pyramidal rigid protective cage according to claim 6, characterized in that: The adjusting component comprises a hydraulic cylinder (26) fixed to one side of the top of the support plate (24), a sleeve ring (25) sleeved on the outer periphery of the connecting shaft (17), a connecting shaft (32) fixed to one side of the bottom of the sleeve ring (25), and a circular gear (33) fixedly sleeved on the outer periphery of the connecting shaft (17) and the rotary cylinder (27) at a position close to each other, the connecting shaft (32) and the top of the inner wall of the rotary cylinder (27) are in sliding insertion connection, the two circular gears (33) are in meshing connection, and the output end of the hydraulic cylinder (26) is fixed to the other side of the bottom of the sleeve ring (25).

9. An elevator shaft doorway pyramidal rigid protective cage according to claim 8, characterized in that: The adjusting component further comprises a rotary cylinder (27) rotatably connected to one side of the top of the support plate (24), two embedded shafts (28) fixed in the inner cavity of the rotary cylinder (27), a magnetic suction seat (29) slidingly sleeved on the outer peripheries of the two embedded shafts (28), a magnetic suction groove (30) opened in the top of the second threaded rod (18), and a spring (31) fixed to the top of the magnetic suction seat (29), one end of the spring (31) is fixed to the top of the inner wall of the rotary cylinder (27), and one end of the magnetic suction seat (29) penetrates through the rotary cylinder (27) and the support plate (24) and extends into the inside of the magnetic suction groove (30).

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