Stretching type elevator shaft opening and shaft protection device

Abstract

The utility model provides a stretching type elevator shaft opening and shaft protection device which comprises an elevator shaft opening protection device and an elevator shaft protection device, the elevator shaft opening protection device comprises a protection grid and a first positioning moving mechanism, and the first positioning moving mechanism is used for fixing the protection grid to the outer side of an elevator shaft opening; the elevator shaft protection device comprises a second positioning mechanism, a supporting frame and a fish scale type protection plate, the second positioning mechanism can be fixed to the inner side of an elevator shaft opening, the supporting frame is arranged on the second positioning mechanism and can be adjusted in a telescopic mode, and the fish scale type protection plate is arranged on the supporting frame. And the fish scale type protection plate can be telescopically adjusted in the front-back direction and the left-right direction. The elevator shaft mouth protection device in the protection device can adapt to shaft mouths of different sizes, meanwhile, disassembly and transportation are convenient, the elevator shaft protection device can adapt to shaft ways of different sizes, meanwhile, inclination of a certain angle can be achieved, and entrapped garbage can be cleared away easily.

Description

Technical Field

[0001] This utility model relates to the field of elevator shaft construction technology, specifically a tension-type elevator shaft opening and shaft protection device. Background Technology

[0002] With the rapid development of science and technology and the economy, high-rise buildings have emerged in large numbers, and elevators have become an indispensable means of transportation in high-rise buildings. During the construction of high-rise buildings, the safety protection of elevator shafts has become a key aspect of safety management. Existing elevator shaft protective devices have the following problems: 1. Most existing elevator shaft protective devices are fixed with expansion bolts, which, while providing high safety, can easily cause damage to the building structure; 2. The protective dimensions of existing elevator shaft protective devices are not adjustable, making them unsuitable for elevator shafts of different sizes, resulting in poor adaptability. Furthermore, the fixed size of the protective frame makes transportation and storage difficult, and the time spent transporting items between floors is long; 3. The existing elevator shaft protective devices cannot be adjusted in size, making them unsuitable for protecting shafts of different sizes. Additionally, the lack of angle adjustment makes it impossible to quickly and effectively clean up debris. Utility Model Content

[0003] The purpose of this utility model is to provide a stretchable elevator shaft opening and shaft protection device. The elevator shaft opening protection device can adapt to shaft openings of different sizes and is easy to disassemble and transport. The elevator shaft protection device can adapt to shafts of different sizes and can tilt at a certain angle, which is conducive to the cleaning of trapped garbage.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a stretchable elevator shaft and shaft protection device, including an elevator shaft protection device and an elevator shaft protection device. The elevator shaft protection device includes a protective grille and a first positioning and moving mechanism. The first positioning and moving mechanism is used to fix the protective grille on the outside of the elevator shaft and can move up and down on the protective grille. The elevator shaft protection device includes a second positioning mechanism, a support frame, and a fish-scale protective plate. The second positioning mechanism can be fixed on the inside of the elevator shaft. The support frame is set on the second positioning mechanism and can swing freely up and down relative to the second positioning mechanism. The support frame can be telescopically adjusted. The fish-scale protective plate is set on the support frame and can be telescopically adjusted in the front-back and left-right directions. During the process of the first positioning and moving mechanism moving upward along the protective grille, the first positioning and moving mechanism can pull the support frame to swing upward synchronously.

[0005] Preferably, the protective grille includes an upper support crossbar, a lower support crossbar, and a protective vertical bar. The upper support crossbar and the lower support crossbar respectively pass through the upper and lower parts of a plurality of vertically arranged protective vertical bars. The upper support crossbar and the lower support crossbar are detachably connected to the protective vertical bars. A detachable limiting nut is provided at both ends of the upper support crossbar and the lower support crossbar.

[0006] Furthermore, the first positioning and moving mechanism includes a first moving positioning seat and a first adjusting rod. A first moving positioning seat is fitted onto the protective vertical rod on the left and right sides of the protective grille. A first internal threaded tube is provided on each first moving positioning seat. The two first internal threaded tubes are distributed in a left-right opposite state. The two ends of the first adjusting rod are respectively fitted into the two first internal threaded tubes. By rotating the first adjusting rod, the two first moving positioning seats can be moved away from or closer to each other. A set screw is provided on the first positioning moving seat to realize its positioning on the corresponding protective vertical rod.

[0007] Furthermore, the second positioning mechanism includes a second positioning seat and a second adjusting rod. The second positioning seat includes two L-shaped clamping plates and a second internally threaded tube. The two L-shaped clamping plates are fixed together by welding and are perpendicular to each other. The two L-shaped clamping plates of the second positioning seat can be respectively snapped onto the two side walls of the right-angle opening on the outer side of the elevator shaft. The second internally threaded tube is horizontally fixed on the upper L-shaped clamping plate. The two ends of the second adjusting rod are respectively fitted with a second internally threaded tube. By rotating the second adjusting rod, the two second positioning seats can be moved away from or closer to each other.

[0008] Furthermore, the support frame includes two telescopic support rods, each of which includes a fixed tube and an adjusting tube. The adjusting tube is sleeved inside one end of the corresponding fixed tube, and a set screw for positioning the adjusting tube is provided on the fixed tube. The fixed tube is rotatably sleeved on the outside of the corresponding second internal threaded tube.

[0009] Furthermore, the fish-scale protective plate includes three adjustable telescopic protective plates. Each adjustable telescopic protective plate includes a rectangular support frame, a fixed protective plate, and an adjustable protective plate. The fixed protective plate is fixedly mounted on the rectangular support frame. The two adjustable protective plates are slidably mounted on opposite sides of the rectangular support frame, with the adjustable protective plates located below the fixed protective plates. All three rectangular support frames are fitted onto the two adjusting tubes, and the rectangular support frames are provided with set screws for positioning them on the adjusting tubes. The front end of the middle set of adjustable telescopic protective plates is located above the rear end of the front set of adjustable telescopic protective plates, and the rear end of the middle set of adjustable telescopic protective plates is located below the front end of the rear set of adjustable telescopic protective plates.

[0010] Furthermore, a rack is fixedly installed on the left side wall of the protective longitudinal rod located on the right side of the protective grille. A freely rotatable support shaft is installed on the first movable positioning seat adjacent to the rack. A gear is fixedly installed at the front end of the support shaft, and the gear meshes with the rack. An insertion interface is provided on the front end face of the gear. A drum is fixedly installed at the rear of the support shaft, and a steel wire rope is wound on the drum. The movable end of the steel wire rope passes through the guide ring provided in the middle of the first adjusting rod and is fixedly connected to the rear end of the two adjusting tubes.

[0011] Furthermore, a kick plate is provided on the bottom front side of the protective grille.

[0012] The beneficial effects of this utility model are as follows: The utility model has a simple structure and is easy to manufacture; the protective longitudinal rod is connected to the upper and lower support crossbars using a set screw, and the limiting nut can be disassembled, thus facilitating the assembly and disassembly of the protective grille and making it easy to transport the protective grille between floors; the distance between the two first movable positioning seats can be adjusted using the first adjusting rod, thus achieving non-destructive locking and fixing of the protective grille in elevator shafts of different widths; the angle of the fish-scale protective plate can be adjusted using a steel wire rope, thus facilitating the cleaning of construction waste on the fish-scale protective plate; simultaneously, the fish-scale protective plate can be adjusted in the front-back and left-right directions, enabling this utility model to achieve safety protection for elevator shafts of different sizes. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a side view of the overall structure of this utility model;

[0016] Figure 3 A schematic diagram of the overall structure of the elevator shaft protection device;

[0017] Figure 4 This is a schematic diagram showing the installation of the elevator shaft protection device at the elevator shaft opening.

[0018] Figure 5 This is the front view of the adjustable telescopic guard plate;

[0019] Figure 6 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 7 for Figure 3 Enlarged view at point B in the middle;

[0021] Figure 8 for Figure 4 Enlarged view at point C;

[0022] Figure 9 This is a schematic diagram illustrating the application state of this utility model;

[0023] In the diagram: 1. Elevator shaft protection device; 11. Upper support crossbar; 111. Limiting nut; 12. Lower support crossbar; 13. Protective longitudinal bar; 14. Kick plate; 15. Rack; 2. First positioning and moving mechanism; 21. First moving positioning seat; 211. First internal threaded pipe; 212. Support shaft; 213. Gear; 2131. Insertion interface; 214. Drum; 215. Wire rope; 22. First adjusting rod; 23. Guide ring; 3. Second positioning mechanism; 31. Second positioning seat; 311. L-shaped clamp; 312. Second internal threaded pipe; 32. Second adjusting rod; 4. Support frame; 41. Fixed pipe; 42. Adjusting pipe; 5. Fish scale protective plate; 51. Adjustable telescopic protective plate; 511. Rectangular support frame; 5111. Guide rail; 512. Fixed protective plate; 513. Adjustable protective plate; 6. Elevator shaft; 7. Elevator shaft; 8. Building structure. Detailed Implementation

[0024] The following will describe specific embodiments and appendices. Figure 1-9 The technical solutions in the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] Elevators are used as a means of transportation in existing high-rise buildings. Elevators are generally installed in the elevator shaft 7 of the main building 8. At the same time, the elevator shaft 7 is connected to each floor through the elevator shaft opening 6 designed for each floor.

[0026] This utility model provides a tension-type elevator shaft and shaft protection device (such as...). Figure 1 As shown, the system includes an elevator shaft opening protection device 1 and an elevator shaft protection device. The elevator shaft opening protection device 1 is used to protect the elevator shaft opening 6 during construction to prevent construction workers from accidentally entering the elevator shaft opening 6 and falling into the elevator shaft 7. The elevator shaft protection device is used to protect the elevator shaft 7 during construction to prevent objects from falling from heights into the elevator shaft 7. The elevator shaft opening protection device 1 includes a protective grille and a first positioning and moving mechanism 2. The first positioning and moving mechanism 2 is used to fix the protective grille to the outside of the elevator shaft opening 6 and can move up and down on the protective grille. The elevator shaft protection device includes a second positioning mechanism 3, a support frame 4, and a fish-scale protective plate 5. The second positioning mechanism 3 can be fixed to the inside of the elevator shaft opening 6, and the support frame 4 is set on the second positioning mechanism 3 and supports... The support frame 4 can swing freely up and down relative to the second positioning mechanism 3. The support frame 4 can be telescopically adjusted. The fish-scale protective plate 5 is set on the support frame 4, and the fish-scale protective plate 5 can be telescopically adjusted in the front-back and left-right directions. By utilizing the front-back and left-right telescopic adjustment capability of the fish-scale protective plate 5, protection of elevator shafts 7 of different sizes can be achieved, thereby improving the protection flexibility of this utility model. During the process of the first positioning moving mechanism 2 moving upward along the protective grille, the first positioning moving mechanism 2 can pull the support frame 4 to swing upward synchronously. During the upward swing of the support frame 4, the garbage intercepted on the fish-scale protective plate 5 will continuously slide to the position of the protective grille under the action of gravity, thereby allowing cleaning personnel to clean up the garbage without entering the elevator shaft 7, thus improving the safety of garbage cleaning.

[0027] Based on the above embodiments, the specific implementation of the protective grille is as follows: The protective grille includes an upper support horizontal bar 11, a lower support horizontal bar 12, and protective vertical bars 13. The upper support horizontal bar 11 and the lower support horizontal bar 12 respectively pass through the upper and lower parts of several vertically arranged protective vertical bars 13. The multiple protective vertical bars 13, together with the upper support horizontal bar 11 and the lower support horizontal bar 12, form a grille shape, which not only achieves isolation and protection but also has a small overall weight. The upper support horizontal bar 11 and the lower support horizontal bar 12 are detachably fixed to the protective vertical bars 13. Specifically, a set screw is provided at the upper and lower parts of each protective vertical bar 13 to fix the protective vertical bar 13 to the upper support horizontal bar 11 and the lower support horizontal bar 12. Adjacent protective elements can also be configured according to actual needs. To facilitate the adjustment of the spacing of the longitudinal bars 13 and the transfer of the protective grille after disassembly, a detachable limiting nut 111 is provided at both ends of the upper support crossbar 11 and the lower support crossbar 12. In this specific embodiment, a shoulder and an external thread are provided at both ends of the upper support crossbar 11 and the lower support crossbar 12, respectively. The shoulder is used to fix the limiting nut 111. The limiting nut 111 can effectively prevent the loose protective longitudinal bars 13 from slipping off from both ends of the upper support crossbar 11 and the lower support crossbar 12, thereby improving the reliability of the protective grille. Furthermore, in practical applications, the length of the upper support crossbar 11 and the lower support crossbar 12 can be appropriately increased according to the width data of elevator shaft openings 6 of different widths, so that the protective grille can achieve isolation and protection for elevator shaft openings 6 of different widths.

[0028] Based on the above embodiments, the specific implementation of the first positioning and moving mechanism is as follows: The first positioning and moving mechanism includes a first moving positioning seat 21 and a first adjusting rod 22. A first moving positioning seat 21 is fitted onto each of the protective longitudinal rods 13 on the left and right sides of the protective grille. A first internal threaded tube 211 is provided on each of the first moving positioning seats 21. The two first internal threaded tubes 211 are distributed in a left-right opposite state. The two ends of the first adjusting rod 22 are correspondingly fitted into the two first internal threaded tubes 211. By rotating the first adjusting rod 22, the two first moving positioning seats 21 can be moved away from or closer to each other. The cooperation relationship between the first adjusting rod 22 and the two first internal threaded tubes 211 is similar to that of existing turnbuckles. Therefore, the cooperation relationship between the first adjusting rod 22 and the two first internal threaded tubes 211 is not specified here. To elaborate further, in practical application, the width of the protective grille is adjusted according to the specific width of the elevator shaft opening 6. After adjusting the width of the protective grille, the two first movable positioning seats 21 are adjusted using the first adjusting rod 22, so that the two first movable positioning seats 21 press against the two side walls of the elevator shaft opening 6 respectively, thereby fixing the protective grille. In the above-mentioned fixing process of the first movable positioning seats 21, there is no need to damage the side walls of the elevator shaft opening 6, which improves the integrity protection of the building body 8. In order to improve the fixing effect of the first positioning movable seats 21 on the protective longitudinal rod 13, a set screw is provided on the first positioning movable seats 21 to realize its positioning on the corresponding protective longitudinal rod 13. When the adjustment and movement of the first movable positioning seats 21 is completed, and further fixing of the first movable positioning seats 21 is required, the set screw is tightened.

[0029] Based on the above embodiments, the specific implementation of the second positioning mechanism is as follows: The second positioning mechanism includes a second positioning seat 31 and a second adjusting rod 32. The second positioning seat 31 includes two L-shaped clamping plates 311 and a second internally threaded tube 312. The two L-shaped clamping plates 311 are fixed together by welding, and the two L-shaped clamping plates 311 are perpendicular to each other. The two L-shaped clamping plates 311 of the second positioning seat 31 can be respectively snapped onto the two side walls of the outer right-angle opening of the elevator shaft opening 6. The second internally threaded tube 312 is horizontally fixed on the upper L-shaped clamping plate 311. The two ends of the second adjusting rod 32 are respectively fitted with a second internal threaded tube 312. By rotating the second adjusting rod 32, the two second positioning seats 31 can be moved away from or closer to each other. By pressing the two second positioning seats 31 with the second adjusting rod 32, the two second positioning seats 31 can be fixedly locked on the outside of the elevator shaft opening 6 of different widths. The cooperation relationship between the two ends of the second adjusting rod 32 and the two second internal threaded tubes 312 is the same as the design cooperation relationship of the existing turnbuckle. Therefore, the cooperation relationship between the two ends of the second adjusting rod 32 and the two second internal threaded tubes 312 will not be described in detail here.

[0030] Based on the above embodiments, the specific implementation of the support frame 4 is as follows: The support frame 4 includes two telescopic support rods, each of which includes a fixed tube 41 and an adjusting tube 42. The adjusting tube 42 is sleeved inside one end of the corresponding fixed tube 41. A set screw is provided on the fixed tube 41 for positioning the adjusting tube 42. The adjusting tube 42 is adjusted and positioned inside the fixed tube 41 by the set screw, thereby realizing the telescopic adjustment of the telescopic support rod. The fixed tube 41 is rotatably sleeved on the outside of the corresponding second internal threaded tube 312. By rotating the fixed tube 41 outside the second internal threaded tube 312, the overall rotation adjustment of the entire support frame 4 can be realized.

[0031] Based on the above embodiments, the specific implementation of the fish-scale protective plate is as follows: The fish-scale protective plate includes three adjustable telescopic protective plates 51. Each adjustable telescopic protective plate 51 includes a rectangular support frame 511, a fixed protective plate 512, and an adjustable protective plate 513. The fixed protective plate 512 is fixedly mounted on the rectangular support frame 511. The two adjustable protective plates 513 are slidably mounted on both sides of the rectangular support frame 511, and the adjustable protective plates 513 are located below the fixed protective plates 512. Specifically, two guide rails 5111 are fixedly mounted on both sides of the rectangular support frame 511, and a T-shaped groove is provided on the guide rail 5111. Two T-shaped guide blocks that cooperate with the two T-shaped grooves are provided at the bottom of the adjustable protective plate 513. The movement and adjustment of the adjustable protective plate 513 are realized by sliding the T-shaped guide blocks in the T-shaped grooves. At the same time, to facilitate the positioning of the adjustable protective plate 513 on the guide rails 5111... Here, multiple set screws are provided on one side of the guide rail 5111 to press and fix the T-shaped guide block. By adjusting the left and right adjustment capability of the protective plate 513, the width of the adjustable telescopic protective plate 51 in the left and right directions can be adjusted. The three rectangular support frames 511 are all sleeved on the two adjusting tubes 42, and set screws are provided on the rectangular support frames 511 to position them on the adjusting tubes 42. By adjusting the movement capability of the rectangular support frames 511 on the adjusting tubes 42, the movement adjustment of the adjustable telescopic protective plate 51 on the adjusting tubes 42 can be realized. The front end of the middle set of adjustable telescopic protective plates 51 is located above the rear end of the front set of adjustable telescopic protective plates 51, and the rear end of the middle set of adjustable telescopic protective plates 51 is located below the front end of the rear set of adjustable telescopic protective plates 51. By utilizing the above-mentioned distribution relationship of the three adjustable telescopic protective plates 51 from high to low, it is convenient to realize the length adjustment of the fish scale protective plate 5 in the front and back directions.

[0032] Based on the above embodiments, the specific implementation of the first positioning and moving mechanism 2 being able to synchronously pull the support frame 4 upward during its upward movement is as follows: A rack 15 is fixedly installed on the left side wall of the protective vertical rod 13 located on the right side of the protective grille; a freely rotatable support shaft 212 is installed on the first moving positioning seat 21 adjacent to the rack 15; a gear 213 is fixedly installed at the front end of the support shaft 212; the gear 213 meshes with the rack 15; when the first moving positioning seat 21 needs to be moved, it can be achieved by rotating the gear 213; since there is only one first moving positioning seat 21... A combination of gears and racks is provided on the side. Therefore, when one first movable positioning seat 21 is moved by gear 213, in order to facilitate the smooth movement of the other first movable positioning seat 21 by using the first adjusting rod 22, the corresponding first movable positioning seat 21 can be moved manually. A plug interface 2131 is provided on the front end face of the gear 213. The gear 213 can be driven by an Allen wrench or directly driven by a motor. A drum 214 is fixedly provided at the rear of the support shaft 212. A steel wire rope 215 is wound on the drum 214. The movable end passes through the guide ring 23 set in the middle of the first adjusting rod 22 and is fixedly connected to the rear ends of the two adjusting tubes 42. In actual application, the drum 214 is fixedly connected to the support shaft 212. Therefore, when the support shaft 212 rotates, the drum 214 rotates. The rotation of the drum 214 realizes the winding of the wire rope 215, which in turn enables the fish-scale protective plate 5 to swing upward. When the fish-scale protective plate 5 tilts and swings to a certain extent, the garbage on it automatically rolls to the protective grid under the action of gravity, which facilitates the subsequent cleaning of the garbage. During normal use of the fish-scale protective plate 5, the first movable positioning seat 21 is used to... The set screw can fix the first movable positioning seat 21. After the first movable positioning seat 21 is fixed, it can effectively prevent the gear 213 from rotating, and then effectively prevent the support shaft 212 from rotating, and then effectively prevent the fish scale protective plate 5 from swinging downwards. In order to further improve the placement stability of the fish scale protective plate 5, a stop block can be fixed at a certain position of the wire rope 215 or a set screw for rotating and positioning the support shaft 212 can be set on the first movable positioning seat 21. The guide ring 23 is used to block the movement of the stop block or the front end of the set screw is inserted into the positioning groove of the support shaft 212 to fix the fish scale protective plate.

[0033] To further improve the protective effect of the protective grille, a kick plate 14 is installed at the bottom front side of the protective grille. The kick plate 14 is fixed by the L-shaped clips installed on each of the protective longitudinal bars 13.

[0034] During the installation and fixing of this utility model, firstly, adjust the distance between the two first movable positioning seats 21 according to the width of the elevator shaft opening, so that the protective grille can be fixed at the elevator shaft opening 6 using the two first movable positioning seats 21 and the first adjusting rod 22. Then, adjust the size of the fish-scale protective plate 5 according to the size of the elevator shaft 7, so that the fish-scale protective plate 5 can achieve closed protection of the elevator shaft 7. After completing the size adjustment of the protective grille and the fish-scale protective plate 5, first fix the protective grille on the elevator shaft opening 6 and make the first positioning and moving mechanism located in the lower area of ​​the protective grille. Then, use hoisting tools to lift the entire elevator shaft protection device and move the elevator shaft. The protective device causes the two second positioning seats 31 to be locked onto the outer edge of the lower inner side of the elevator shaft opening 6. Then, the second adjusting rod 32 is rotated so that the two second positioning seats 31 are fixed at the corresponding right angle openings. After the two second positioning seats 31 are fixed, one end of the wire rope 215 is passed through the guide ring 23. Then, the fish scale protective plate 5 is slowly lowered using the hoisting equipment, thereby achieving the tilting placement of the fish scale protective plate 5. When the fish scale protective plate 5 is tilted into place, the wire rope 215 is tightened and its movable end is fixed on the drum 214. After the wire rope 215 is fixed, the hoisting equipment releases the fish scale protective plate 5, and then the fish scale protective plate 5 is installed.

[0035] In this utility model, "upper", "lower", "front", "back", "left", and "right" are all relative positions used to facilitate the description of positional relationships, and therefore cannot be understood as absolute positions to limit the scope of protection.

[0036] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0037] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. For those skilled in the art, several improvements and modifications can be made without departing from the concept of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A stretchable elevator shaft opening and shaft guard, characterized in that, The system includes an elevator shaft opening protection device and an elevator shaft protection device. The elevator shaft opening protection device includes a protective grille and a first positioning and moving mechanism. The first positioning and moving mechanism is used to fix the protective grille to the outside of the elevator shaft opening and can move up and down on the protective grille. The elevator shaft protection device includes a second positioning mechanism, a support frame, and a fish-scale protective plate. The second positioning mechanism can be fixed to the inside of the elevator shaft opening. The support frame is mounted on the second positioning mechanism and can swing freely up and down relative to the second positioning mechanism. The support frame can be telescopically adjusted. The fish-scale protective plate is mounted on the support frame and can be telescopically adjusted in the front-back and left-right directions. As the first positioning and moving mechanism moves upward along the protective grille, it can pull the support frame to swing upward synchronously.

2. A stretchable elevator shaft opening and shaft guard according to claim 1, characterized in that The protective grille includes an upper support crossbar, a lower support crossbar, and a protective vertical bar. The upper and lower support crossbars pass through the upper and lower parts of several vertically arranged protective vertical bars, respectively. The upper and lower support crossbars are detachably connected to the protective vertical bars. A detachable limiting nut is provided at both ends of the upper and lower support crossbars.

3. A stretchable elevator shaft opening and shaft guard according to claim 2, characterized in that The first positioning and moving mechanism includes a first movable positioning seat and a first adjusting rod. A first movable positioning seat is fitted onto the protective vertical rod on the left and right sides of the protective grille. A first internal threaded tube is provided on each first movable positioning seat. The two first internal threaded tubes are distributed in a left-right opposite state. The two ends of the first adjusting rod are fitted into the two first internal threaded tubes respectively. By rotating the first adjusting rod, the two first movable positioning seats can be moved away from or closer to each other. A set screw is provided on the first movable positioning seat to realize its positioning on the corresponding protective vertical rod.

4. A stretchable elevator shaft opening and shaft guard according to claim 3, characterized in that The second positioning mechanism includes a second positioning seat and a second adjusting rod. The second positioning seat includes two L-shaped clamping plates and a second internally threaded tube. The two L-shaped clamping plates are fixed together by welding and are perpendicular to each other. The two L-shaped clamping plates of the second positioning seat can be respectively snapped onto the two side walls of the right-angle opening on the outer side of the elevator shaft. The second internally threaded tube is horizontally fixed on the upper L-shaped clamping plate. The two ends of the second adjusting rod are respectively fitted with a second internally threaded tube. By rotating the second adjusting rod, the two second positioning seats can be moved away from or closer to each other.

5. A stretchable elevator shaft opening and shaft guard according to claim 4, characterized in that The support frame includes two telescopic support rods, each of which includes a fixed tube and an adjusting tube. The adjusting tube is sleeved inside one end of the corresponding fixed tube, and a set screw for positioning the adjusting tube is provided on the fixed tube. The fixed tube is rotatably sleeved on the outside of the corresponding second internal threaded tube.

6. A stretchable elevator shaft opening and shaft guard according to claim 5, characterized in that The fish-scale protective plate includes three adjustable telescopic protective plates. Each adjustable telescopic protective plate includes a rectangular support frame, a fixed protective plate, and an adjustable protective plate. The fixed protective plate is fixedly mounted on the rectangular support frame. The two adjustable protective plates are slidably mounted on opposite sides of the rectangular support frame, with the adjustable protective plates located below the fixed protective plates. The three rectangular support frames are all fitted onto the two adjusting tubes, and the rectangular support frames are provided with set screws for positioning them on the adjusting tubes. The front end of the middle set of adjustable telescopic protective plates is located above the rear end of the front set of adjustable telescopic protective plates, and the rear end of the middle set of adjustable telescopic protective plates is located below the front end of the rear set of adjustable telescopic protective plates.

7. A telescoping elevator shaft access and shaft guard according to claim 6, wherein the inner shaft guard is mounted to the outer shaft guard by means of a hinge. A rack is fixedly installed on the left side wall of the protective longitudinal rod located on the right side of the protective grille. A freely rotatable support shaft is installed on the first movable positioning seat adjacent to the rack. A gear is fixedly installed at the front end of the support shaft, and the gear meshes with the rack. An insertion interface is provided on the front end face of the gear. A drum is fixedly installed at the rear of the support shaft, and a steel wire rope is wound on the drum. The movable end of the steel wire rope passes through the guide ring provided in the middle of the first adjusting rod and is fixedly connected to the rear end of the two adjusting tubes.

8. A stretchable elevator shaft opening and shaft guard according to claim 7, characterized in that A kick plate is installed on the bottom front side of the protective grille.

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