Safety suspension device for high-altitude construction

Through the longitudinal clamping and lateral adjustment components in the guide adjustment unit, the problem of poor applicability of the suspension system in different scenarios is solved, and the safety and life of the suspension rope is improved.

CN223062080UActive Publication Date: 2025-07-04CHINA CONSTR SEVENTH ENG DIVISION CORP LTD +1
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Patent Information

Application Number
CN202422084047.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-27
Publication Date
2025-07-04
Estimated Expiration
2034-08-27

AI Technical Summary

Technical Problem

The existing high-altitude construction suspension system cannot be used for hanging ropes and suspension frames of different diameters, causing the rope to rub against other components, affecting safety and service life.

Method used

Using a guide adjustment unit including a longitudinal clamping assembly and a transverse adjustment assembly, the pulley position is adjusted through an elastic guide assembly and an electric screw to adapt to suspended ropes of different diameters, and limit the swing of the rope to reduce friction.

Benefits of technology

The scope of application of suspension devices has been expanded, the safety and service life of suspension ropes have been improved, the friction between ropes and other components has been reduced, and the reliability of suspension ropes in different scenarios is ensured.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a high-altitude construction safety suspension device which solves the technical problem that an existing high-altitude construction suspension system is poor in reliability when being switched and used in different scenes. The device comprises a fixed box provided with a winding unit, the winding unit is used for winding and unwinding a suspension rope, a positioning frame is arranged at the bottom of the fixed box, and a guide adjusting unit used for guiding the suspension rope is arranged on the positioning frame. The guide adjusting unit comprises a longitudinal clamping assembly and a transverse adjusting assembly arranged on the longitudinal clamping assembly, and the transverse adjusting assembly comprises two pulleys located on the two sides of the hanging rope respectively. Compared with the prior art, according to the safety suspension device for high-altitude construction, the push plate is pushed to the middle of the movable groove through the longitudinal clamping assembly, the pulley is driven to clamp the suspension rope, the swing amplitude of the suspension rope in the using process is limited, friction between the suspension rope and other parts is reduced, and the safety of the suspension rope is improved. And reliable application in different scenes is realized.
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Description

Technical Field

[0001] The utility model relates to the technical field of suspension construction devices, in particular to a high-altitude construction safety suspension device. Background Art

[0002] In a building construction site, in order to facilitate construction workers to work at heights, a suspension system such as an external hanging basket or a suspension rope is usually used to lift personnel or items. The suspension systems in the prior art generally wind and release the ropes through a driving motor. Due to different construction requirements and application scenarios, suspension ropes of different diameters need to be equipped or different suspension systems need to be used. For example, the suspension ropes of suspension systems for different material transfers, and the suspension ropes of suspension systems for carrying different numbers of workers. In order to have corresponding load-bearing capacities and avoid potential safety hazards, corresponding suspension ropes are required.

[0003] Therefore, the following problems exist: Firstly, the suspension systems in the prior art cannot be applied to suspension ropes of different diameters. If the suspension ropes of the suspension system are replaced to meet the different requirements of different application scenarios, the angles and positions of the suspension ropes in contact with the components will change, resulting in adverse friction, which will affect the safety and service life of the suspension ropes. Secondly, the suspension systems in the prior art cannot be applied to different suspension frames. If the suspension frames of the suspension system are replaced to meet the different requirements of different application scenarios, the positions and inclination directions of the suspension ropes will change, and the suspension ropes will rub against objects such as walls with the swing of the suspension frame, which will also affect the safety and service life of the suspension ropes.

[0004] Therefore, it is necessary to design a high-altitude operation suspension device with a wide application range, flexible use and high safety performance.

[0005] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background art of the present utility model, and should not be regarded as an admission or any form of suggestion that the above technical information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0006] In view of the above deficiencies in the background art, the present utility model provides a high-altitude construction safety suspension device, which solves the technical problem of poor reliability of the existing high-altitude construction suspension system when switching and using in different scenarios.

[0007] The technical solution of the present application is as follows:

[0008] A high-altitude construction safety suspension device includes a fixed box provided with a winding unit, the winding unit is used to reel in and out a suspension rope, a positioning frame is provided at the bottom of the fixed box, a guiding adjustment unit for guiding the suspension rope is provided on the positioning frame, the guiding adjustment unit includes a longitudinal clamping assembly and a transverse adjustment assembly arranged on the longitudinal clamping assembly, and the transverse adjustment assembly includes two pulleys respectively located on both sides of the suspension rope.

[0009] On the basis of the above technical solution, as a preferred embodiment of the high-altitude construction safety suspension device, the longitudinal clamping assembly includes elastic guide assemblies symmetrically arranged on the front and rear sides of the positioning frame, and the front and rear elastic guide assemblies are respectively connected to push plates, and the lateral adjustment assembly includes an electric screw arranged on the push plate, and the pulley is connected to the electric screw through a screw slide.

[0010] On the basis of the above technical solution, as a preferred implementation mode of the high-altitude construction safety suspension device, a movable groove is provided on the positioning frame, and the two ends of the push plate are respectively slidably matched with the inner walls on the left and right sides of the movable groove, and one end of the elastic guide component is slidably matched with the guide hole on the front side wall or the rear side wall of the movable groove, and the other end is fixedly connected to the push plate.

[0011] On the basis of the above technical solution, as a preferred implementation of the high-altitude construction safety suspension device, guide grooves are provided on the inner walls on both sides of the movable groove, and the two ends of the push plate are respectively slidably matched with the guide grooves on both sides.

[0012] On the basis of the above technical solution, as a preferred implementation mode of the high-altitude construction safety suspension device, a guide groove which is away from the elastic guide assembly and perpendicular to the elastic guide assembly is provided on the push plate, the electric screw is arranged in parallel in the guide groove, and the three outer walls of the screw slide are slidably matched with the guide groove.

[0013] On the basis of the above technical solution, as a preferred implementation of the high-altitude construction safety suspension device, the pulley is rotatably arranged on a mounting frame through a rotating shaft, and the mounting frame is a U-shaped structure with an opening facing away from the screw slide, and the pulley is located in a groove of the U-shaped structure.

[0014] On the basis of the above technical solution, as a preferred embodiment of the high-altitude construction safety suspension device, the elastic guide assembly includes a guide column that is slidably fitted with the guide hole, and the end of the guide column facing away from the guide hole is connected to the push plate. A spring is provided on the outer sleeve of the guide column, and the two ends of the spring are respectively connected to the positioning frame and the push plate.

[0015] On the basis of the above technical solution, as a preferred embodiment of the high-altitude construction safety suspension device, each of the push plates is connected to at least three of the elastic guiding components, and the elastic guiding components on the push plate are arranged at equal intervals.

[0016] On the basis of the above technical solution, as a preferred embodiment of the high-altitude construction safety suspension device, the winding unit includes a winding shaft rotatably arranged in the fixed box, and the winding shaft is connected to the driving motor through a transmission shaft.

[0017] On the basis of the above technical solution, as a preferred embodiment of the high-altitude construction safety suspension device, the driving motor is arranged outside the fixed box, the fixed box is connected with a protection plate for protecting the driving motor, and the fixed box is provided with an observation window for observing the inside.

[0018] Compared with the prior art, the technical solution provided by the present utility model has the following beneficial effects:

[0019] A high-altitude construction safety suspension device provided by the present utility model drives the guide post to move in the guide hole through the spring rebound, so as to push the push plate towards the middle of the movable slot, drive the pulley to clamp the suspension rope, limit the swing amplitude of the suspension rope during use, and reduce the friction between the suspension rope and other components.

[0020] When the suspension rope longitudinally sways inside the positioning frame, the thrust generated by the suspension rope will drive one of the push plates to move backward, causing the spring behind the push plate to contract, but the spring behind the other push plate will get an extension space and will push the push plate towards the suspension rope to fit, so that the suspension rope is always located between the two pulleys, avoiding the suspension rope falling off between the two pulleys during use.

[0021] Through the cooperation of the spring and the push plate, the distance between the two pulleys can be changed, so as to clamp suspension ropes of different diameters, expanding the scope of application. Moreover, the surface of the pulley in contact with the suspension rope is arc-shaped, which is more suitable for the suspension rope, making the pressure and friction force at each part of the suspension rope more uniform.

[0022] By adjusting the electric screw rod and moving the position of the positioning screw rod slider, the screw rod slider can drive the pulley on the mounting frame to move horizontally relative to the push plate, facilitating the suspension rope to follow the pulley for position adjustment during the winding process, and making the suspension ropes on the winding shaft evenly distributed. Description of the Drawings

[0023] To more clearly illustrate the embodiments of the present utility model, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the safety suspension device for high-altitude construction;

[0025] Figure 2 It is a schematic diagram of the internal structure of the fixed box in the safety suspension device for high-altitude construction;

[0026] Figure 3 It is a schematic diagram of the overall structure of the positioning frame in the safety suspension device for high-altitude construction;

[0027] Figure 4 It is a schematic diagram of the overall structure of the pulley in the safety suspension device for high-altitude construction.

[0028] Explanation of the reference numerals in the drawings: 1, fixed box; 2, observation window; 3, mounting plate; 4, screw hole; 5, suspension ring; 6, suspension rope; 7, protective plate; 8, drive motor; 9, transmission shaft; 10, winding shaft; 11, positioning frame; 12, guide post; 13, spring; 14, push plate; 15, movable groove; 16, guide groove; 17, electric lead screw; 18, lead screw slider; 19, mounting frame; 20, pulley; 21, rotating shaft. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the core concept of the present utility model and the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0030] These embodiments are provided in this application to make this application thorough and complete, and to fully convey the scope of this application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0031] It should be noted that in the description of this application, unless otherwise specified, "several" means greater than or equal to two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", etc. is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0032] In addition, the "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the elements before this word are covered by the elements listed after this word, and do not exclude the possibility of also covering other elements.

[0033] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0034] All terms used in this application have the same meanings as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0035] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0036] A safety suspension device for high-altitude construction, such as Figure 1 and Figure 2As shown in the figure, it includes a fixed box 1 provided with a winding unit for winding and unwinding a suspension rope 6. A positioning frame 11 is provided at the bottom of the fixed box 1, and a guiding and adjusting unit for guiding the suspension rope 6 is provided on the positioning frame 11. The guiding and adjusting unit includes a longitudinal clamping assembly and a transverse adjusting assembly provided on the longitudinal clamping assembly. The transverse adjusting assembly includes two pulleys 20 respectively located on both sides of the suspension rope 6. The longitudinal clamping assembly can adjust the longitudinal position of the suspension rope 6, and the transverse adjusting assembly can dynamically adjust the winding position of the suspension rope 6. At the same time, the two pulleys 20 cooperate with the longitudinal clamping assembly to be applicable to suspension ropes 6 of different specifications.

[0037] The longitudinal clamping assembly includes elastic guiding assemblies symmetrically arranged on the front side and the rear side of the positioning frame 11. Push plates 14 are respectively connected to the elastic guiding assemblies on the front side and the rear side. The transverse adjusting assembly includes an electric lead screw 17 provided on the push plate 14. The pulley 20 is connected to the electric lead screw 17 through a lead screw slider 18. The drive motor of the electric lead screw 17 can be either built into the push plate 14 or externally placed outside the push plate 14, as long as reliable transmission is ensured and the displacement of the pulley 20 is not affected.

[0038] Specifically, as shown in Figure 3 and Figure 4 the figure, an activity slot 15 is provided on the positioning frame 11. The two ends of the push plate 14 are respectively in sliding fit with the inner walls on the left and right sides of the activity slot 15. One end of the elastic guiding assembly is in sliding insertion fit with a guiding hole on the front side wall or the rear side wall of the activity slot 15, and the other end is fixedly connected to the push plate 14.

[0039] Furthermore, guiding grooves are provided on the inner walls on the left and right sides of the activity slot 15, and the two ends of the push plate 14 are respectively in sliding fit with the guiding grooves on both sides.

[0040] On the basis of the above technical solution, as a preferred implementation manner of the high-altitude construction safety suspension device, a guiding slot 16 is provided on the push plate 14, which faces away from the elastic guiding assembly and is perpendicular to the elastic guiding assembly. The electric lead screw 17 is arranged in parallel in the guiding slot 16, and the three outer walls of the lead screw slider 18 are in sliding fit with the guiding slot 16.

[0041] On the basis of the above technical solution, as a preferred implementation manner of the high-altitude construction safety suspension device, the pulley 20 is rotatably arranged on an installation frame 19 through a rotating shaft 21. The installation frame 19 is a U-shaped structure with an opening facing away from the lead screw slider 18, and the pulley 20 is located inside the notch of the U-shaped structure.

[0042] On the basis of the above technical solution, as a preferred implementation manner of the high-altitude construction safety suspension device, the elastic guiding assembly includes a guiding column 12 that is slidably inserted and matched with the guiding hole. One end of the guiding column 12 away from the guiding hole is connected to the pushing plate 14. A spring 13 is sleeved outside the guiding column 12. Two ends of the spring 13 are respectively abutted against the positioning frame 11 and the pushing plate 14.

[0043] Furthermore, at least three of the elastic guiding assemblies are connected to each pushing plate 14, and the elastic guiding assemblies on the pushing plate 14 are arranged at equal intervals.

[0044] On the basis of the above technical solution, as a preferred implementation manner of the high-altitude construction safety suspension device, the winding unit includes a winding shaft 10 rotatably arranged in the fixed box 1. The winding shaft 10 is connected to a driving motor 8 through a transmission shaft 9. Of course, a reduction mechanism and a braking assembly same as those in the prior art are arranged between the driving motor 8 and the transmission shaft 9. Since its structure has nothing to do with the technical problem to be solved by this application, it will not be elaborated here.

[0045] Furthermore, the driving motor 8 is arranged outside the fixed box 1. The fixed box 1 is connected with a protection plate 7 for protecting the driving motor 8. An observation window 2 for observing the interior is arranged on the fixed box 1.

[0046] As a preferred implementation manner of the high-altitude construction safety suspension device, as Figures 1 - 4 shown, it includes a fixed box 1. An observation window 2 is opened on the front side of the fixed box 1. A mounting plate 3 is installed on one side of the fixed box 1 away from the observation window 2. A plurality of screw holes 4 are opened on the mounting plate 3. A winding shaft 10 is installed inside the fixed box 1. A suspension rope 6 is installed on the winding shaft 10. The other end of the suspension rope 6 is installed with a suspension ring 5. A driving motor 8 is installed on one side of the winding shaft 10. The driving motor 8 is installed on the fixed box 1. A transmission member is installed outside the suspension rope 6. A clamping member is installed at the bottom of the fixed box 1. A protection plate 7 is installed on one side of the fixed box 1. The driving motor 8 is located below the protection plate 7. The output end of the driving motor 8 is installed with a transmission shaft 9. The transmission shaft 9 is rotatably installed inside the fixed box 1. The winding shaft 10 is installed on the transmission shaft 9. By providing the observation window 2, the winding state of the suspension rope 6 on the winding shaft 10 wound inside the fixed box 1 can be observed, which is convenient for timely adjusting the position of the suspension rope 6 during the winding process.

[0047] Please refer to Figure 3, the clamping member includes a positioning frame 11, the positioning frame 11 is installed at the bottom of the fixed box 1, the positioning frame 11 is located below the winding shaft 10, an activity groove 15 is formed in the positioning frame 11, two push plates 14 are symmetrically installed in the activity groove 15, a plurality of guide columns 12 are installed on one side of the push plate 14, a spring 13 is sleeved outside the guide column 12, the top of the spring 13 is connected to the push plate 14, and the bottom of the spring 13 is connected to the positioning frame 11. A transmission member is installed on the side of the push plate 14 away from the guide column 12. A plurality of round holes are formed in the positioning frame 11, and one end of the guide column 12 away from the push plate 14 is inserted into the round hole. The spring 13 provided can drive the push plate 14 to push towards the middle of the activity groove 15, thereby clamping suspension ropes 6 with different diameters and restricting the position of the suspension ropes 6 to prevent the suspension ropes 6 from rubbing against the outer shell of the fixed box 1 during the shaking process.

[0048] Please refer to Figure 4 , the transmission member includes a lead screw slider 18, the lead screw slider 18 is inserted into the push plate 14, a guide groove 16 is formed in the push plate 14, an electric lead screw 17 is installed in the guide groove 16, an installation frame 19 is installed in front of the lead screw slider 18, a pulley 20 is installed on the installation frame 19, the lead screw slider 18 is connected to the electric lead screw 17, a rotating shaft 21 is rotatably installed on one side of the installation frame 19, the pulley 20 is installed on the rotating shaft 21, and the rotating shaft 21 installs the pulley 20 on the installation frame 19. The pulley 20 provided can assist in transmitting the suspension rope 6, improving the smoothness during the winding and unwinding process of the suspension rope 6.

[0049] Specific implementation method: Place the fixed box 1 at the position where it needs to be used, fix the installation plate 3 to the wall using bolts. After fixing, drive the motor 8 to rotate to drive the winding shaft 10 to rotate, thereby driving the suspension rope 6 to fall. The spring 13 rebounds to drive the guide column 12 to move in the round hole, thereby pushing the push plate 14 towards the middle of the activity groove 15, driving the pulley 20 to clamp the suspension rope 6, restricting the swinging amplitude of the suspension rope 6 during use, and reducing the probability of the suspension rope 6 breaking due to rubbing against sharp objects such as the wall.

[0050] When the suspension rope 6 sways horizontally inside the positioning frame 11, the thrust generated by the suspension rope 6 will drive one of the push plates 14 to move backward, causing the spring 13 behind the push plate 14 to contract, but the spring 13 behind the other push plate 14 will obtain an expansion space and will push the push plate 14 towards the suspension rope 6 to fit, so that the suspension rope 6 is always located between the two pulleys 20, preventing the suspension rope 6 from falling off between the two pulleys 20 during use.

[0051] Through the cooperation of the spring 13 and the push plate 14, the distance between the two pulleys 20 can be changed, so as to clamp the suspension ropes 6 with different diameters, improve the adaptability of the pulleys 20, and the surface of the pulley 20 in contact with the suspension rope 6 is arc-shaped, which is more adaptable to the suspension rope 6 and reduces friction. The movement position of the lead screw slide seat 18 is restricted by the electric lead screw 17, so that the lead screw slide seat 18 can drive the mounting frame 19 to move horizontally on the push plate 14, which is convenient for driving the suspension rope 6 to adjust its position following the winding condition of the winding shaft 10 during the winding process of the suspension rope 6, so that the suspension ropes 6 on the winding shaft 10 are evenly distributed.

[0052] The above content shows and describes the basic principle, main features and beneficial effects of the present invention. The above 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 principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety suspension device for high-altitude construction, characterized in that: It includes a fixed box (1) provided with a winding unit for winding and unwinding a suspension rope (6). A positioning frame (11) is provided at the bottom of the fixed box (1), and a guiding and adjusting unit for guiding the suspension rope (6) is provided on the positioning frame (11). The guiding and adjusting unit includes a longitudinal clamping assembly and a transverse adjusting assembly provided on the longitudinal clamping assembly. The transverse adjusting assembly includes two pulleys (20) respectively located on both sides of the suspension rope (6).

2. The high-altitude construction safety suspension device according to claim 1, characterized in that: The longitudinal clamping assembly includes elastic guiding assemblies symmetrically arranged on the front side and the rear side of the positioning frame (11). Push plates (14) are respectively connected to the elastic guiding assemblies on the front side and the rear side. The transverse adjusting assembly includes an electric lead screw (17) provided on the push plate (14), and the pulley (20) is connected to the electric lead screw (17) through a lead screw slide block (18).

3. The safety suspension device for high-altitude construction according to claim 2, characterized in that: An activity groove (15) is provided on the positioning frame (11). Both ends of the push plate (14) are slidably matched with the inner walls on the left and right sides of the activity groove (15). One end of the elastic guiding assembly is slidably inserted into a guiding hole on the front side wall or the rear side wall of the activity groove (15), and the other end is fixedly connected to the push plate (14).

4. The high-altitude construction safety suspension device according to claim 3, wherein: Guiding grooves are provided on the inner walls on the left and right sides of the activity groove (15), and both ends of the push plate (14) are slidably matched with the guiding grooves on both sides respectively.

5. The safety suspension device for high-altitude construction according to claim 4, wherein: A guiding groove (16) departing from the elastic guiding assembly and perpendicular to the elastic guiding assembly is provided on the push plate (14). The electric lead screw (17) is arranged in parallel in the guiding groove (16), and the three outer walls of the lead screw slide block (18) are slidably matched with the guiding groove (16).

6. The safety suspension device for high-altitude construction according to any one of claims 3-5, characterized in that: The pulley (20) is rotatably arranged on a mounting frame (19) through a rotating shaft (21). The mounting frame (19) is a U-shaped structure with an opening facing away from the lead screw slide block (18), and the pulley (20) is located inside the notch of the U-shaped structure.

7. The high-altitude construction safety suspension device according to claim 6, characterized in that: The elastic guiding assembly includes a guiding column (12) slidably inserted into the guiding hole. One end of the guiding column (12) departing from the guiding hole is connected to the push plate (14). A spring (13) is sleeved outside the guiding column (12), and both ends of the spring (13) are respectively abutted against the positioning frame (11) and the push plate (14).

8. The high-altitude construction safety suspension device according to any one of claims 2-5 and 7, characterized in that: Each push plate (14) is connected to at least three of the elastic guiding assemblies, and the elastic guiding assemblies on the push plate (14) are arranged at equal intervals.

9. The high-altitude construction safety suspension device according to claim 8, characterized in that: The winding unit includes a winding shaft (10) rotatably arranged inside the fixed box (1). The winding shaft (10) is connected to a driving motor (8) through a transmission shaft (9).

10. The safety suspension device for high-altitude construction according to claim 9, wherein: The driving motor (8) is arranged outside the fixed box (1). The fixed box (1) is connected with a protection plate (7) for protecting the driving motor (8), and an observation window (2) for observing the interior is provided on the fixed box (1).