Portable protection device for elevator shaft

Abstract

The utility model discloses a portable protective device for an elevator shaft, which comprises a fixed rod and a foldable protective frame, the protective frame is detachably connected with a protective net, the protective frame is connected with the fixed rod through a folding mechanism, and the fixed rod is provided with an elastic limiting mechanism for limiting the folding mechanism. When the folding mechanism moves to the position above the elastic limiting mechanism, the folding mechanism drives the protection frame to stretch, the stretched protection frame is matched with the elevator shaft in a stopping mode, then a protection net is connected to the protection frame in a hanging mode, the protection device is placed into the elevator shaft, and installation of the protection device can be completed. The protection device is pulled out of the elevator shaft, and then the protection frame can be disassembled. The mounting process and the dismounting process of the protective device do not need to screw screws, so that the mounting process and the dismounting process are more convenient, and the technical problem that the mounting process and the dismounting process of the protective device are inconvenient in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator shaft protection, in particular to a convenient protection device for an elevator shaft. Background Art

[0002] Elevator shafts at construction sites are a significant source of danger, making elevator protection crucial. Currently, there are two common methods for protecting elevator shafts. One involves erecting a steel frame, starting from the basement and extending all the way to the top floor, with wooden formwork platforms used every three floors. This method is expensive, requiring significant labor for installation and removal, and the cost of renting steel pipes and using wooden formwork also increases the cost. The other method involves installing expansion screws or bolts around the perimeter of the elevator shaft, and then securing a protective net with these bolts to form a protective layer.

[0003] For example, a Chinese patent with authorization publication number CN217949830U discloses a rotatable elevator shaft protection device, including a shaft and embedded pipes, wherein a plurality of embedded pipes are fixedly embedded at both ends of one side of the corresponding shaft, and a hook head bolt is inserted into the interior of the plurality of embedded pipes, one end of the hook head bolt is fixedly provided with a threaded section, and the threaded section extends to the outside of the shaft, and the inner end of the hook head bolt is fixedly provided with a hook head section, and the upper sides of two adjacent hook head sections are clamped with steel pipes, and a horizontal net is provided between the plurality of steel pipes, and the four corners of the horizontal net are fixed to the steel pipes on both sides by steel wire.

[0004] However, when installing or removing the hook bolts in the above-mentioned public documents, workers are required to perform high-altitude operations in the elevator shaft and tighten the bolts one by one to install or remove the protective device. The installation efficiency and removal efficiency of the protective device are not high by tightening the bolts one by one. The installation and removal processes of the protective device are not convenient, and the protective device cannot be installed and removed quickly. Utility Model Content

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a convenient protective device for an elevator shaft, which solves the technical problem of inconvenient installation and disassembly processes of the protective device in the prior art.

[0006] The technical solution of the present utility model is achieved as follows: a convenient protective device for an elevator shaft, comprising a fixed rod and a foldable protective frame, wherein a protective net is detachably connected to the protective frame, the protective frame is connected to the fixed rod through a folding mechanism, and the fixed rod is provided with an elastic limiting mechanism for limiting the folding mechanism. When the folding mechanism moves along the fixed rod to below the elastic limiting mechanism, the folding mechanism drives the protective frame to fold, and the folded protective frame is disengaged from the blocking cooperation with the elevator shaft; when the folding mechanism moves along the fixed rod to above the elastic limiting mechanism, the folding mechanism is blocked and cooperated with the elastic limiting mechanism, and the folding mechanism drives the protective frame to extend, and the extended protective frame is blocked and cooperated with the elevator shaft.

[0007] Preferably, the folding mechanism includes a sliding sleeve, which is slidably connected to the fixed rod, and a first connecting rod is provided between the sliding sleeve and the protective frame, and the two ends of the first connecting rod are hinged to the sliding sleeve and the protective frame respectively, and a second connecting rod is provided on the fixed rod, and the top of the second connecting rod is hinged to the fixed rod, and the bottom of the second connecting rod is hinged to the first connecting rod.

[0008] Preferably, at least two of the first connecting rods are hinged on the sliding sleeve, and at least two of the second connecting rods are hinged on the corresponding fixed rod.

[0009] Preferably, a hook is provided on the inner side of the protection frame, and the hook is connected to the protection net.

[0010] Preferably, the protective frame is a quadrilateral frame.

[0011] Preferably, the protective frame includes eight first frame bodies and four second frame bodies, any two first frame bodies are hinged to form a frame side wall, the four second frame bodies are located at the four corners of the protective frame, a frame side wall is set between the two second frame bodies, and the first frame body is hinged to the second frame body.

[0012] Preferably, any two of the first frame bodies are connected by a first hinge; the first frame body and the second frame body are connected by a second hinge. The second frame body is an L-shaped structure, and the two ends of the second frame body are hinged to the first frame bodies of the two frame side walls respectively.

[0013] Preferably, the elastic limiting mechanism includes a limiting groove arranged on the fixed rod, a spring is provided in the limiting groove, one end of the spring is connected to the inner wall of the limiting groove, and the other end of the spring is connected to the limiting block. When the limiting block is pushed out of the limiting groove by the spring, the limiting block cooperates with the sliding sleeve to stop.

[0014] Preferably, a fixed block is provided on the side wall of the limit groove, and the limit block includes a first limit block and a second limit block connected to each other, the first limit block is slidably connected to the limit groove and is stopped in the limit groove by the fixed block, the second limit block is plugged into the limit groove and can extend out of the limit groove, and the part of the second limit block extending out of the limit groove is stopped and engaged with the sliding sleeve.

[0015] Preferably, the second limiting block is a trapezoidal limiting block.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model controls the state of the protective frame by adjusting the position of the folding mechanism. When the folding mechanism moves along the fixed rod to above the elastic limiting mechanism, the folding mechanism cooperates with the elastic limiting mechanism stop, and the folding mechanism drives the first frame body and the second frame body to extend into a protective frame that cooperates with the elevator shaft stop. After the protective frame cooperates with the elevator shaft stop, the protective net is hung on the protective frame, and the protective device is placed in the elevator shaft to complete the installation of the protective device; the protective device can be pulled out at any time above the elevator shaft to complete the disassembly of the protective device. The installation and disassembly processes of the protective device do not require screwing, which greatly improves efficiency and makes the installation and disassembly processes of the protective device more convenient.

[0018] 2. After the protective device of the present invention is assembled, the protective device is placed downward from the top of the elevator shaft, and the protective frame of the protective device cooperates with the top surface stop of the elevator shaft to complete the protection in the vertical direction of the elevator shaft, preventing the protective device from moving downward in the vertical direction of the elevator shaft. At the same time, the first connecting rod on the protective device abuts against the inner wall of the elevator shaft to prevent the protective device from moving in the horizontal direction of the elevator shaft, and the protective device is limited on the elevator shaft in two vertical directions, thereby improving the protective strength of the protective device; when removing the protective device, the protective device can be directly pulled out from the top of the elevator shaft to complete the removal of the protective device from the elevator shaft, which greatly improves the installation and removal efficiency of the protective device, and the protective device of the present application does not require entering the elevator shaft for high-altitude operations, which greatly reduces the danger of installing and removing the protective device, and avoids the dangerous situations caused by entering the elevator shaft and performing installation and removal work at high altitudes.

[0019] 3. After the protective device of the present invention is disassembled, the position of the folding mechanism can be controlled by controlling the elastic limiting mechanism. After pressing the elastic limiting mechanism with one button, the folding mechanism can be moved below the elastic limiting mechanism to complete the folding of the protective device, thereby reducing the space occupied by the protective device and avoiding the situation where the protective device occupies a large space after disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a three-dimensional diagram of the connection between the protective frame and the folding mechanism of the present invention.

[0022] Figure 2 It is a three-dimensional diagram of the protective frame of the present utility model.

[0023] Figure 3 It is a three-dimensional diagram of the connection between the folding mechanism and the elastic limiting mechanism of the utility model.

[0024] Figure 4 This is a top view of the connection between the protective device of the utility model and the elevator shaft.

[0025] Figure 5 This is a side view of the connection between the protective device of the utility model and the elevator shaft.

[0026] In the figure, 1 is a fixed rod, 2 is a sliding sleeve, 3 is a first connecting rod, 4 is a second connecting rod, 5 is a protective net, 6 is a first hinge, 7 is a hook, 8 is a limit groove, 9 is a spring, 10 is a limit block, 11 is a fixed block, 12 is a first limit block, 13 is a second limit block, 14 is an elevator shaft, 15 is a first frame body, 16 is a second frame body, and 17 is a second hinge. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1, a convenient protective device for an elevator shaft, such as Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown, the protective frame comprises a fixed rod 1 and a foldable protective frame, to which a protective net 5 is detachably connected. The protective frame is connected to the fixed rod 1 via a folding mechanism. The fixed rod 1 is provided with an elastic limiting mechanism for limiting the folding mechanism. When the folding mechanism moves along the fixed rod 1 to below the elastic limiting mechanism, the folding mechanism drives the protective frame to fold, and the folded protective frame is disengaged from the elevator shaft 14. When the folding mechanism moves along the fixed rod 1 to above the elastic limiting mechanism, the folding mechanism engages with the elastic limiting mechanism, and the folding mechanism drives the protective frame to extend, and the extended protective frame is locked with the elevator shaft 14. The protective frame is disposed above the fixed rod 1. The state of the protective frame is controlled by adjusting the position of the folding mechanism. When the folding mechanism moves along the fixed rod to above the elastic limiting mechanism, the folding mechanism cooperates with the elastic limiting mechanism, and the folding mechanism drives the first frame body and the second frame body to extend into a protective frame that cooperates with the elevator shaft 14. After the protective frame cooperates with the elevator shaft 14, the protective net 5 is hung on the protective frame, and the protective device is placed in the elevator shaft 14 to complete the installation of the protective device; the protective device can be pulled out from bottom to top above the elevator shaft 14 to complete the disassembly of the protective device. The disassembly process of the protective device is relatively convenient, and the installation and disassembly processes of the protective device do not require screwing, which greatly improves efficiency. The installation and disassembly processes of the protective device are more convenient, which solves the technical problem of the inconvenient installation and disassembly processes of the protective device in the prior art.

[0029] Example 2, a convenient protective device for an elevator shaft, based on Example 1, as Figure 1 and Figure 5 As shown, the folding mechanism includes a sleeve 2 that is slidably connected to a fixed rod 1. A first connecting rod 3 is disposed between the sleeve 2 and the protective frame. The ends of the first connecting rod 3 are hinged to the sleeve 2 and the protective frame, respectively. A second connecting rod 4 is disposed on the fixed rod 1, located above the sleeve 2. The top of the second connecting rod 4 is hinged to the fixed rod 1, and the bottom of the second connecting rod 4 is hinged to the first connecting rod 3. When the sleeve 2 moves below the elastic stop mechanism, it drives the first and second connecting rods 3 and 4 to retract toward the fixed rod 1, thereby retracting the protective frame. Once retracted, the protective frame disengages from the elevator shaft 14. When the sleeve 2 moves above the elastic stop mechanism, it drives the first and second connecting rods 3 and 4 to extend away from the fixed rod 1, thereby extending the protective frame. Once extended, the protective frame engages the elevator shaft 14. After the protective device is removed, the folding mechanism completes its folding, reducing the space occupied by the protective device and avoiding the situation where the protective device occupies a large space after removal.

[0030] Example 3, a convenient protective device for an elevator shaft, based on Example 2, as Figure 1 and Figure 5 As shown, at least two first connecting rods 3 are hinged on the sliding sleeve 2, and at least two second connecting rods 4 are hinged on the corresponding fixed rod 1. Preferably, four first connecting rods 3 are hinged on the sliding sleeve 2, and four second connecting rods 4 are hinged on the corresponding fixed rod 1. The four first connecting rods 3 are symmetrically arranged along the circumference of the sliding sleeve 2. The four first connecting rods 3 are respectively hinged to the four second connecting rods 4. The arrangement of the second connecting rods 4 enables the sliding sleeve 2 to drive the first connecting rods 3 to retract or extend when the sliding sleeve 2 moves.

[0031] Example 4, a convenient protective device for an elevator shaft, based on Example 3, as Figure 1 、 Figure 2 and Figure 4 As shown, the inner wall of the protective frame is provided with a hook 7, which is connected to the protective net 5. The protective frame is first extended, and after the protective frame is engaged with the elevator shaft 14, the protective net 5 is hung on the hook 7 of the protective frame. When the protective device is disassembled, the protective net 5 is first removed, and then the first frame body 15 and the second frame body 16 are retracted.

[0032] Example 5, a convenient protective device for an elevator shaft, based on Example 4, as Figure 1 and Figure 2 As shown, the protective frame is a quadrilateral frame. On the one hand, the quadrilateral frame can be adapted to the elevator shaft 14. On the other hand, the four corners of the quadrilateral frame are respectively hinged with a first connecting rod 3, which facilitates the first connecting rod 3 to control the folding and retraction of the protective frame.

[0033] Example 6, a convenient protective device for an elevator shaft, based on Example 5, as Figure 1 As shown, the protective frame includes eight first frame bodies 15 and four second frame bodies 16. Any two first frame bodies 15 are hinged to form a frame side wall. The four second frame bodies 16 are located at the four corners of the protective frame. A frame side wall is set between the two second frame bodies 16. The first frame bodies 15 and the second frame bodies 16 are hinged. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to retract toward the fixed rod 1, the second frame bodies 16 first retract toward the fixed rod 1. At the same time, the first frame bodies 15 and the second frame bodies 16 retract toward the fixed rod 1, realizing the folding and folding of the protective frame. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to extend away from the fixed rod 1, the first frame body 15 extends away from the fixed rod 1, and then the second frame body 16 extends away from the fixed rod 1, finally forming a quadrilateral frame.

[0034] Example 7, a convenient protective device for an elevator shaft, based on Example 5, as Figure 1 and Figure 2 As shown, any two of the first frame bodies 15 are connected by a first hinge 6; the first frame body 15 and the second frame body 16 are connected by a second hinge 17. The second frame body 16 is an L-shaped structure, with its ends hinged to the first frame bodies 15 on the two frame side walls. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to retract toward the fixed rod 1, the second frame body 16 approaches the fixed rod 1, then drives the end of the first frame body 15 away from the first hinge 6 toward the fixed rod 1, achieving the folding and retraction of the protective frame. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to extend away from the fixed rod 1, the first frame body 15 extends away from the fixed rod 1, and then the second frame body 16 extends away from the fixed rod 1, ultimately forming a quadrilateral frame. The first hinge 6 is provided to facilitate the rotation and folding of the two first frame bodies 15; the second hinge 17 is provided to facilitate the movement of the second frame body 16 relative to the first frame body 15 to ensure that the first connecting rod 3 can be retracted toward the fixed rod 1.

[0035] Example 8, a convenient protective device for an elevator shaft, based on any one of Examples 2 to 7, as Figure 3 As shown, the elastic limiting mechanism includes a limiting groove 8 provided on the fixed rod 1, wherein a spring 9 is provided in the limiting groove 8, one end of the spring 9 is connected to the inner wall of the limiting groove 8, and the other end of the spring 9 is connected to a limiting block 10. When the limiting block 10 is pushed out of the limiting groove 8 by the spring 9, the limiting block 10 is engaged with the sliding sleeve 2. By pressing the limiting block 10 into the limiting groove 8, the sliding sleeve 2 can be controlled to slide along the fixed rod 1. When the spring 9 is in a normal state, the limiting block 10 is pushed out of the limiting groove 8 by the spring 9, that is, when the spring 9 is in a normal state, the limiting block 10 and the sliding sleeve 2 are in a blocking engagement state.

[0036] Example 9, a convenient protective device for an elevator shaft, based on Example 8, as Figure 3 As shown, a fixing block 11 is provided on the side wall of the limiting groove 8. The limiting block 10 includes a first limiting block 12 and a second limiting block 13 connected to each other. The first limiting block 12 is slidably connected to the limiting groove 8 and is blocked in the limiting groove 8 by the fixing block 11. The second limiting block 13 is plugged into the limiting groove 8 and can extend out of the limiting groove 8. The portion of the second limiting block 13 extending out of the limiting groove 8 is blocked and engaged with the sliding sleeve 2. The fixing block 11 is provided at the opening of the limiting groove 8, ensuring that the first limiting block 12 is blocked in the limiting groove 8, and preventing the limiting block 10 from sliding out of the limiting groove 8 as a whole, thereby preventing the limiting block 10 from being disengaged from the limiting groove 8.

[0037] Example 10, a convenient protective device for an elevator shaft, based on Example 9, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the second limit block 13 is a trapezoidal limit block. The second limit block 13 is used to cooperate with the sliding sleeve 2 for blocking. When the second limit block 13 is a trapezoidal limit block, the upper bottom surface or the lower bottom surface of the trapezoidal limit block cooperates with the sliding sleeve 2 for blocking. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to retract toward the fixed rod 1, thereby driving the protective frame to retract, that is, when the sliding sleeve 2 moves downward along the fixed rod 1, the upper bottom surface of the trapezoidal limit block cooperates with the sliding sleeve 2 for blocking. When the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to extend in the direction away from the fixed rod 1, thereby driving the protective frame to extend, that is, when the sliding sleeve 2 When moving upward along the fixed rod 1, the lower bottom surface of the trapezoidal limit block cooperates with the sliding sleeve 2; the length of the upper bottom surface is smaller than the length of the lower bottom surface. When pressing the second limit block 13, it is convenient to move the sliding sleeve 2 from the upper bottom surface of the trapezoidal limit block to the lower bottom surface of the trapezoidal limit block. At the same time, the length of the lower bottom surface is greater than the length of the upper bottom surface, so that when the protective frame is in the retracted state, the sliding sleeve 2 can be easily disengaged from the stop on the upper bottom surface of the trapezoidal limit block; when the protective frame is in the extended state, the sliding sleeve 2 will not be easily disengaged from the stop on the lower bottom surface of the trapezoidal limit block.

[0038] When implementing Example 10, when installing the protective device, first press the second limit block 13, so that the sliding sleeve 2 passes over the second limit block 13 and moves up along the fixed rod 1, and moves the sliding sleeve 2 toward the lower bottom surface of the second limit block 13. At this time, the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to extend in the direction away from the fixed rod 1, and then drives the first frame body 15 and the second frame body 16 to extend to form a protective frame. When the protective frame is extended to the right position, the sliding sleeve 2 is blocked and matched with the lower bottom surface of the second limit block 13, and then the protective net 5 is hung on the hook 7 of the protective frame. , a protective device can be formed, and then the protective device is placed downward from the top of the elevator shaft 14. The protective frame of the protective device cooperates with the top surface of the elevator shaft 14 to complete the protection in the vertical direction of the elevator shaft 14, preventing the protective device from moving downward in the vertical direction of the elevator shaft 14. At the same time, the first connecting rod 3 on the protective device abuts against the inner wall of the elevator shaft 14, preventing the protective device from moving in the horizontal direction of the elevator shaft 14, and limiting the protective device on the elevator shaft 14 in two vertical directions, thereby improving the protective strength of the protective device.

[0039] When removing the protective device, first pull out the protective device from above the elevator shaft 14, then disengage the protective net 5 from the hook 7, remove the protective net 5 from the protective frame, and then press the second limit block 13 to make the sliding sleeve 2 pass over the second limit block 13 and move down along the fixed rod 1, and move the sliding sleeve 2 toward the upper bottom surface of the second limit block 13. At this time, the sliding sleeve 2 drives the first connecting rod 3 and the second connecting rod 4 to retract toward the direction of the fixed rod 1, and then drives the first frame body 15 and the second frame body 16 to retract. When the protective frame is retracted into place, the sliding sleeve 2 is located below the upper bottom surface of the second limit block 13, and the protective device can be folded to complete the disassembly of the protective device.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable protective device for an elevator shaft, characterized in that: The invention comprises a fixed rod (1) and a foldable protective frame, wherein a protective net (5) is detachably connected to the protective frame, and the protective frame is connected to the fixed rod (1) via a folding mechanism. The fixed rod (1) is provided with an elastic limiting mechanism for limiting the folding mechanism. When the folding mechanism moves along the fixed rod (1) to below the elastic limiting mechanism, the folding mechanism drives the protective frame to fold, and the folded protective frame is disengaged from the stop engagement with the elevator shaft (14); when the folding mechanism moves along the fixed rod (1) to above the elastic limiting mechanism, the folding mechanism stops and engages with the elastic limiting mechanism, and the folding mechanism drives the protective frame to extend, and the extended protective frame stops and engages with the elevator shaft (14).

2. The portable protective device for an elevator shaft according to claim 1, characterized in that: The folding mechanism comprises a sliding sleeve (2), the sliding sleeve (2) being slidably connected to the fixed rod (1), a first connecting rod (3) being provided between the sliding sleeve (2) and the protective frame, the two ends of the first connecting rod (3) being hinged to the sliding sleeve (2) and the protective frame respectively, a second connecting rod (4) being provided on the fixed rod (1), the top of the second connecting rod (4) being hinged to the fixed rod (1), and the bottom of the second connecting rod (4) being hinged to the first connecting rod (3).

3. The portable protective device for an elevator shaft according to claim 2, characterized in that: At least two of the first connecting rods (3) are hinged on the sliding sleeve (2), and at least two of the second connecting rods (4) are hinged on the corresponding fixed rod (1).

4. The portable protective device for an elevator shaft according to claim 3, characterized in that: A hook (7) is provided on the inner side of the protection frame, and the hook (7) is connected to the protection net (5).

5. The portable protective device for an elevator shaft according to claim 4, characterized in that: The protective frame is a quadrilateral frame.

6. The portable protective device for an elevator shaft according to claim 5, characterized in that: The protective frame includes eight first frame bodies (15) and four second frame bodies (16), any two first frame bodies (15) are hinged to form a frame side wall, the four second frame bodies (16) are located at the four corners of the protective frame, a frame side wall is set between the two second frame bodies (16), and the first frame body (15) and the second frame body (16) are hinged.

7. The portable protective device for an elevator shaft according to claim 6, characterized in that: Any two of the first frame bodies (15) are connected via a first hinge (6); and the first frame body (15) and the second frame body (16) are connected via a second hinge (17).

8. The portable protective device for an elevator shaft according to any one of claims 2 to 7, characterized in that: The elastic limiting mechanism comprises a limiting groove (8) provided on the fixing rod (1), a spring (9) being provided in the limiting groove (8), one end of the spring (9) being connected to the inner wall of the limiting groove (8), and the other end of the spring (9) being connected to the limiting block (10), and when the limiting block (10) is pushed out of the limiting groove (8) by the spring (9), the limiting block (10) is engaged with the sliding sleeve (2) for blocking.

9. The portable protective device for an elevator shaft according to claim 8, characterized in that: A fixed block (11) is provided on the side wall of the limiting groove (8), and the limiting block (10) includes a first limiting block (12) and a second limiting block (13) connected to each other, the first limiting block (12) is slidably connected to the limiting groove (8) and is stopped in the limiting groove (8) by the fixed block (11), the second limiting block (13) is plugged into the limiting groove (8) and can extend out of the limiting groove (8), and the portion of the second limiting block (13) extending out of the limiting groove (8) is stopped and engaged with the sliding sleeve (2).

10. The portable protective device for an elevator shaft according to claim 9, characterized in that: The second limiting block (13) is a trapezoidal limiting block.

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