Anti-falling buffer system of construction hoist

Abstract

The invention discloses an anti-falling buffer system of a construction hoist, which is applied to the related technical field of the hoist, a mechanical multi-stage buffer energy consumption unit is additionally arranged on a vertical column of the hoist, a key second safety defense line is provided for abnormal falling of a cage, the core is that the system does not depend on electric power, and even when power is cut off, the system is safe and reliable. The plurality of reverse suppressors can continuously absorb the falling energy through compression energy consumption of the rubber sheets and bending fracture of the guide rods in sequence, so that the final landing speed and impact force of the cage are remarkably reduced; meanwhile, aiming at the problem of possible transient secondary acceleration of the cage at the moment that the reverse suppressor is separated from the upright post, a secondary acceleration suppression unit is additionally arranged, and the secondary acceleration amplitude generated by the cage can be effectively suppressed at the moment that a certain reverse suppressor is separated from the I-shaped upright post, so that the whole buffer speed reduction process is more continuous and smoother, and the service life of the cage is prolonged. The obvious pause feeling is reduced, and the impact on personnel in the cage is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of elevators, and in particular to a fall protection buffer system for construction elevators. Background Technology

[0002] Construction hoists are lifting machines that vertically transport people or goods. The platform is often equipped with various horizontal conveying devices as connecting devices for conveyor lines at different heights. They are generally hydraulically driven, hence the name hydraulic hoist. Besides transporting goods at different heights, they are widely used in high-altitude installation, maintenance, and other construction operations. Currently, construction hoists commonly use electrical or electromechanical linkage braking systems as the primary fall prevention measure. This system can brake suddenly upon detecting overspeed, and its effectiveness has been widely verified.

[0003] However, existing fall protection technologies still have room for improvement. First, the brake system is highly dependent on the power and control system, and is at risk of failure in the event of an unexpected power outage or electrical fault. For example, Chinese patent CN115549527B discloses a brake control system for a construction hoist, and Chinese patent CN104753403B discloses a motor brake control system for a construction hoist. Second, as an active braking device, it may experience insufficient braking force or insufficient buffering after a single braking under extreme conditions (such as brake surface wear or excessive impact load), leading to secondary acceleration of the hoist cage. This results in the cage ultimately impacting the bottom at a high speed, generating a huge impact force and posing a significant safety hazard. Summary of the Invention

[0004] The core of this invention lies in adding a mechanical multi-stage buffer energy dissipation unit to the elevator column, providing a crucial second line of defense against abnormal cage falls. Furthermore, it is electricity-free; even in the event of a power outage, multiple reverse suppressors can sequentially absorb falling energy through the compression of rubber sheets and the bending and breakage of guide rods, thereby significantly reducing the final landing speed and impact force of the cage. Simultaneously, the secondary acceleration suppression unit effectively suppresses the secondary acceleration amplitude of the cage after buffering, reducing jolting sensations and minimizing damage.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A fall protection buffer system for a construction hoist includes a controller mounted on the hoist, a speed sensor mounted on the hoist cage, a brake system mounted on the hoist cage lifting wheels, and a multi-stage buffer energy dissipation unit mounted on the I-shaped column of the hoist. The multi-stage buffer energy dissipation unit includes multiple reverse suppressors mounted on the end of the I-shaped column near the hoist cage. Each reverse suppressor includes a stepped back plate and a trapezoidal stop connected to the middle of the stepped back plate via a rotating shaft and a torsion spring. An electromagnetic plate is fixedly mounted on the upper half of the stepped back plate near the end face of the trapezoidal stop. The on / off state of the electromagnetic plate is controlled by the controller. Vertical guide rails are fixedly connected to the left and right inner walls of the I-shaped column, and the two ends of the rotating shaft are slidably connected to the two vertical guide rails respectively. Multiple guide rods are fixedly connected to the back of the stepped back plate. Multiple sets of guide grooves are chiseled on the I-shaped column, each corresponding to a multiple reverse suppressor. The number of guide grooves in each set is consistent with the number of guide rods on the corresponding reverse suppressor. The guide rods move through the guide grooves and are fastened with fastening nuts. A rubber sheet is fixedly connected to the bottom of the guide groove, and the guide rods and the rubber sheet are in contact with each other.

[0007] Furthermore, the rubber sheet is made of a high-toughness material, the upper and lower edges of the guide groove are semi-circular, the middle is rectangular, and a gap is left directly below the connection between the guide rod and the stepped back plate. The depth of the gap is no more than 2 / 3 of the diameter of the guide rod.

[0008] Furthermore, an upper pressure sensor and a lower pressure sensor are respectively installed on the stepped back plate and the electromagnetic plate at the ends away from the I-shaped column. The upper pressure sensor is located above the lower pressure sensor, and the upper pressure sensor and the lower pressure sensor correspond to the middle of the long right-angle end and the short right-angle end of the trapezoidal block, respectively. A rubber pad is fixedly attached to the outer end of the trapezoidal block near the upper half of the stepped back plate.

[0009] Furthermore, the trapezoidal stop is tilted when not subjected to external force, and the angle between the trapezoidal stop and the upper part of the stepped back plate is 30-60°. When the trapezoidal stop is in a vertical state, it does not contact the vertically moving cage. When the trapezoidal stop is in a horizontal state, the length of the trapezoidal stop and the cage coinciding at the top view angle is not less than half the length of the trapezoidal stop.

[0010] Optionally, the multi-stage buffer energy dissipation unit also includes a secondary acceleration suppression unit installed in the vertical guide rail. The secondary acceleration suppression unit includes a retaining strip fixedly connected between the left and right inner walls of the vertical guide rail and multiple tensile strips that transversely penetrate the two retaining strips and the vertical guide rail.

[0011] Furthermore, the retaining strips are made of elastic, wear-resistant, and high-temperature resistant material, and the distance between the two retaining strips is less than the diameter of the shaft. At the ends of the two retaining strips that are close to each other, multiple corresponding metal springs are fixedly embedded. The cross-section of the metal springs is arc-shaped and matches the shaft.

[0012] Furthermore, the tensile strip includes two pairs of opposing spherical limiting hemispheres, a metal strip that moves through the two pairs of limiting hemispheres, and an outer sheath wrapped around the outer end of the metal strip. The two pairs of limiting hemispheres are located on both sides of the vertical guide rail and abut against the vertical guide rail. The limiting hemisphere includes a limiting layer and a spacer layer fixedly connected to the end of the limiting layer. The limiting layer and the spacer layer are fixedly connected.

[0013] Furthermore, the occupant layers of the two limiting hemispheres are in contact with each other. The limiting layer is a rigid structure, while the occupant layer is an elastic structure. The maximum diameter of the limiting layer is 3-5 times the diameter of the metal strip.

[0014] Furthermore, the distance between two adjacent tensile bars is less than the distance between two reverse suppressors, and not more than three times the distance between the upper and lower inner walls of the guide groove. The limit position when the middle of the metal bar is stretched downward is lower than the position of the next tensile bar.

[0015] Compared with the prior art, the advantages of this invention are: (1) By installing a mechanical multi-stage buffer energy dissipation unit on the elevator column, a crucial second line of defense is provided for abnormal cage falls. Its core is that it does not rely on electricity. Even in the event of a power outage, multiple reverse suppressors can absorb the energy of the fall in sequence through the compression of the rubber sheet and the bending and breaking of the guide rod, thereby significantly reducing the final landing speed and impact force of the cage.

[0016] (2) At the same time, in response to the problem of a brief secondary acceleration that may occur when the cage separates from the reverse suppressor and the column, a secondary acceleration suppression unit was added. In this unit, a continuous buffer structure composed of multiple tensile bars is arranged in the path of the reverse suppressor sliding down the guide rail after it detaches. It can smoothly and continuously receive and buffer the falling reverse suppressor, effectively suppressing the speed rebound caused by the complete failure of a single reverse suppressor, making the entire deceleration process smoother and reducing the sense of jerking. This further optimizes the buffer performance and improves the continuity and reliability of fall protection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the fall protection system of the present invention; Figure 2 This is a schematic diagram of the invention installed on an elevator; Figure 3 This is a schematic diagram of the invention during the lifting of the cage; Figure 4This is a schematic diagram of the invention during cage descent; Figure 5 This is a perspective view of the reverse suppressor of the present invention; Figure 6 This is a schematic diagram showing the change of the reverse suppressor when the cage of the present invention rises; Figure 7 This is a schematic diagram illustrating the change of the reverse suppressor when the cage descends abnormally according to the present invention; Figure 8 This is a partial schematic diagram of the back side of the I-shaped column corresponding to the reverse suppressor of the present invention; Figure 9 This is a top view of the I-shaped column after the reverse suppressor is installed according to the present invention; Figure 10 This is a schematic diagram of the secondary acceleration suppression unit on the side wall of the I-shaped column of the present invention; Figure 11 This is a front view of the suppression rope of the present invention; Figure 12 This is a schematic diagram of the secondary acceleration suppression unit of the present invention when the reverse suppressor separates from the I-shaped column.

[0018] Explanation of the labels in the diagram: 1 Reverse suppressor, 11 Stepped back plate, 12 Trapezoidal stop, 13 Rotating shaft, 14 Electromagnetic plate, 101 Rubber pad, 102 Upper pressure sensor, 103 Lower pressure sensor, 21 Guide rod, 22 Rubber sheet, 201 Guide groove, 202 Fastening nut, 203 Vertical guide rail, 3 Tensile strip, 4 Shaft retaining strip, 311 Limiting layer, 312 Occupant layer, 32 Metal strip, 33 Outer sheath. Detailed Implementation

[0019] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0020] First implementation method: like Figure 1 A fall protection buffer system for a construction hoist includes a controller mounted on the hoist, a speed sensor mounted on the hoist cage, a brake system mounted on the hoist cage's lifting wheels, and a multi-stage buffer energy dissipation unit mounted on the hoist's I-shaped columns. The brake system is a conventional fall protection mechanism for hoists in the prior art. Based on this, this solution adds a multi-stage buffer energy dissipation unit, which can provide a multi-stage buffering effect on the hoist cage when it falls abnormally, thereby effectively suppressing its acceleration and ensuring that its instantaneous speed upon landing is not too high, thus significantly reducing safety hazards.

[0021] The speed sensor is used to monitor the speed of the cage during its descent. When the cage's descent speed exceeds the preset safety threshold, the brake system can be triggered to slow down the cage. If the slowdown effect is not obvious or limited, the controller can trigger a multi-level buffer energy dissipation unit to assist the brake system in buffering and dissipating energy during the cage's descent. This provides a mechanical energy dissipation and speed reduction mechanism that does not rely on the power system in the event of an abnormal cage fall, thus establishing a safety barrier for life and property.

[0022] like Figure 2 and Figure 5 In the diagram, 'a' represents the hoisting cage and 'b' represents the I-shaped column. The multi-stage buffer energy dissipation unit includes multiple reverse suppressors 1 installed on the end of the I-shaped column near the hoisting cage. Each reverse suppressor 1 includes a stepped back plate 11 and a trapezoidal stop 12 connected to the middle of the stepped back plate 11 via a rotating shaft 13 and a torsion spring. An electromagnetic plate 14 is fixedly installed on the upper half of the stepped back plate 11 near the end face of the trapezoidal stop 12. The on / off state of the electromagnetic plate 14 is controlled by a controller. Vertical guide rails 203 are fixedly connected to the left and right inner walls of the I-shaped column. The two ends of the rotating shaft 13 are slidably connected to the two vertical guide rails 203 respectively. The trapezoidal stop 12 is tilted when not subjected to external force, and the angle between the trapezoidal stop 12 and the upper half of the stepped back plate 11 is 30-60°. Figure 4 and Figure 6 When the trapezoidal stop 12 is in a vertical position, it does not contact the vertically moving cage. Figure 3 This ensures that during the ascent of the hoisting cage, when the cage pushes against the trapezoidal stop 12, the trapezoidal stop 12 has sufficient space to rotate towards the upper part of the stepped back plate 11, making it less likely for the trapezoidal stop 12 to affect the ascent of the hoisting cage. Figure 4 and Figure 7 When the trapezoidal stop 12 is in a horizontal state, the length of the trapezoidal stop 12 that coincides with the cage from a top-down angle is not less than half the length of the trapezoidal stop 12. When the cage falls abnormally, the electromagnetic plate 14 automatically cuts off the power. At this time, the trapezoidal stop 12 is in an inclined state, and the bottom of the cage can come into contact with the trapezoidal stop 12, which gradually makes it horizontal. The length of the two overlaps is greater than half of the trapezoidal stop 12, so that the center of force of the trapezoidal stop 12 is biased towards the rotating shaft 13, making the guide rod 21 less likely to break prematurely. At the same time, the area of ​​the trapezoidal stop 12 in the opposite direction of the cage is relatively large, and the effect is better.

[0023] like Figure 8Multiple guide rods 21 are fixedly connected to the back of the stepped back plate 11. Multiple sets of guide grooves 201 are chiseled on the I-shaped column, each corresponding to a different reverse suppressor 1. The number of guide grooves 201 in each set matches the number of guide rods 21 on the corresponding reverse suppressor 1. The guide rods 21 movably pass through the guide grooves 201 and are securely connected to fastening nuts 202. A rubber sheet 22 is fixedly connected to the bottom of the guide groove 201, and the guide rods 21 and the rubber sheet 22 are in contact. The rubber sheet 22 is made of a high-toughness material. The upper and lower edges of the guide groove 201 are semi-circular, and the middle is rectangular, allowing for a large vertical distribution of the rubber sheet 22. When the reverse suppressor 1 is squeezed by the falling cage, the rubber sheet 22... The rubber sheet 22 can be gradually compressed, thereby consuming a certain amount of energy and buffering the cage. A gap is left directly below the connection between the guide rod 21 and the stepped back plate 11. The depth of the gap is no more than 2 / 3 of the diameter of the guide rod 21. As the cage continues to fall, when the rubber sheet 22 is squeezed to its limit, the gap on the guide rod 21 will gradually crack and bend until the reverse suppressor 1 separates from the I-shaped column. At this time, the reverse suppressor 1 moves down with the cage along the two vertical guide rails 203 until it contacts the next reverse suppressor 1, and the above process is repeated. Under the action of multiple reverse suppressors 1, multi-level buffering of the cage is achieved, thereby effectively reducing the falling speed of the cage and reducing safety hazards.

[0024] An upper pressure sensor 102 and a lower pressure sensor 103 are respectively installed on the stepped back plate 11 and the electromagnetic plate (14) at the ends away from the I-shaped column. The upper pressure sensor 102 is located above the lower pressure sensor 103, and the upper pressure sensor 102 and the lower pressure sensor 103 correspond to the middle of the long right-angle end and the short right-angle end of the trapezoidal stop 12, respectively. A rubber pad 101 is fixedly attached to the outer end of the trapezoidal stop 12 near the upper half of the stepped back plate 11. When the cage is descending normally, the controller controls the electromagnetic plate 14 to be energized, so that it generates a magnetic attraction force on the trapezoidal stop 12, thereby causing it to descend. Gradually, it comes into contact with the stepped back plate 11, thus avoiding the cage and preventing it from affecting the cage's descent. The upper pressure sensor 102 can monitor whether the trapezoidal stop 12 has avoided the cage in place, making it easy to detect trapezoidal stop 12 that has not rotated as expected, thereby effectively ensuring the normal operation of the elevator. In case of abnormal fall, after the cage squeezes the trapezoidal stop 12, the trapezoidal stop 12 approaches the lower half of the stepped back plate 11, causing the lower pressure sensor 103 to be subjected to force. Based on its data, it can reflect the force when the cage falls. The controller, combined with the data from the speed sensor, can make an effective judgment on the condition of the cage.

[0025] In addition, it is worth noting that when the elevator falls abnormally, the electromagnetic plate 14 is in a de-energized state. That is, the setting of this multi-stage buffer energy dissipation unit does not depend on electricity. When the elevator is working, if there is an unexpected power outage, multiple reverse suppressors 1 can play a multi-stage support role at the bottom of the reverse suppressor 1, thereby effectively preventing the cage from falling directly due to an unexpected power outage and further improving safety.

[0026] When a falling signal is detected in the hoist cage, the existing brake system is triggered, and the electromagnetic plate 14 is automatically de-energized. This causes multiple reverse suppressors 1 to tilt naturally. As the cage falls, they deflect along with the cage until it is horizontal. As it continues to fall, the reverse suppressor 1 disengages from the hoist. Then, the next reverse suppressor 1 repeats the above process, achieving multi-level buffering. By installing mechanical multi-stage buffer energy dissipation units on the elevator column, a crucial second line of defense is provided for abnormal cage falls. Its core feature is that it does not rely on electricity; even in the event of a power outage, multiple reverse suppressors 1 can continuously absorb falling energy through compression energy dissipation and adaptive bending fracture, thereby significantly reducing the final landing speed and impact force of the cage.

[0027] Second implementation method: This embodiment adds a secondary acceleration suppression unit based on the first embodiment, while the rest remains the same as the first embodiment.

[0028] like Figures 9-10 The multi-stage buffer energy dissipation unit also includes a secondary acceleration suppression unit installed in the vertical guide rail 203. The secondary acceleration suppression unit includes a retaining rubber strip 4 fixedly connected between the left and right inner walls of the vertical guide rail 203 and multiple tensile strips 3 that transversely penetrate the two retaining rubber strips 4 and the vertical guide rail 203. The retaining rubber strips 4 are made of elastic, wear-resistant, and high-temperature resistant material, and the distance between the two retaining rubber strips 4 is less than the diameter of the rotating shaft 13, so that after the rotating shaft 13 is separated from the metal spring, it is press-fitted with the retaining rubber strip 4, thereby press-fitting the reverse suppressor 1 with the two retaining rubber strips 4, which can also suppress the cage. The falling speed is buffered and suppressed to a certain extent. The two retaining strips 4 are fixedly inlaid with multiple corresponding metal springs at their close ends. The cross-section of the metal springs is arc-shaped and matches the rotating shaft 13. The setting of the metal springs can create a relatively stable rotation environment for the rotating shaft 13, which facilitates the smooth rotation of the trapezoidal stop 12. At the same time, due to the elasticity of the metal springs, when the guide rod 21 breaks and the reverse suppressor 1 separates from the I-shaped column, the metal springs can deform under the pressure of the rotating shaft 13, so that the rotating shaft 13 enters between the two retaining strips 4.

[0029] like Figure 11The tensile strip 3 includes two pairs of opposing spherical limiting hemispheres, a metal strip 32 that moves between the two pairs of limiting hemispheres, and an outer sheath 33 wrapped around the outer end of the metal strip 32. The outer sheath 33 is an elastic structure, mainly used to protect the metal strip 32, making it less prone to corrosion due to exposure to air, thereby effectively ensuring the buffer protection of the metal strip 32 when the cage falls abnormally. The two pairs of limiting hemispheres are located on both sides of the vertical guide rail 203 and abut against the vertical guide rail 203. The limiting hemispheres include a limiting layer 311 and a spacer layer 312 fixedly connected to the end of the limiting layer 311. The limiting layer 311 and the spacer layer 312 is fixedly connected, with the two limiting hemispheres' occupant layers 312 in contact with each other. The limiting layer 311 is a rigid structure, while the occupant layer 312 is an elastic structure. The maximum diameter of the limiting layer 311 is 3-5 times the diameter of the metal strip 32. The distance between two adjacent tensile strips 3 is less than the distance between two reverse suppressors 1, and not greater than 3 times the distance between the upper and lower inner walls of the guide groove 201. The extreme position of the metal strip 32 when stretched downwards is lower than the position of the next tensile strip 3. When the reverse suppressor 1 separates from the I-shaped column, the rotating shaft 13 can abut against the tensile strip 3 when it falls along the vertical guide rail 203. Figure 12 Under the downward compressive force of the rotating shaft 13, due to the elasticity of the occupant layer 312, the two ends of the tensile strip 3 can move towards the middle, making the effective length of the metal strip 32 longer. When it breaks under the compression of the rotating shaft 13, the middle part can approach the next tensile strip 3, and it reaches the next tensile strip 3 before it is stretched to the limit position, causing the next tensile strip 3 to undergo downward stretching deformation. That is, after it breaks, the next tensile strip 3 can immediately take over the previous tensile strip 3 to produce a suppressive buffering effect on the downward movement of the reverse suppressor 1. The whole suppressive buffering process is relatively continuous, thereby effectively reducing the amplitude of secondary acceleration caused by the disappearance of the temporary buffering force of the reverse suppressor 1 when the cage falls between the two reverse suppressors 1, thereby further improving the fall prevention effect and reducing safety hazards.

[0030] Meanwhile, by setting multiple anti-tensile strips 3, when a certain reverse suppressor 1 separates from the I-shaped column, it can effectively suppress the secondary acceleration amplitude generated by the cage, making the entire buffer deceleration process more continuous and smooth, reducing obvious jerking sensation, and reducing the impact on the personnel inside the cage.

[0031] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A fall protection buffer system for a construction hoist, comprising a controller mounted on the hoist, a speed sensor mounted on the hoist cage, a brake system mounted on the hoist cage's lifting wheels, and a multi-stage buffer energy dissipation unit mounted on the hoist's I-shaped column, characterized in that: The multi-level buffer energy dissipation unit includes multiple reverse suppressors (1) installed on the end of the I-shaped column near the cage. The reverse suppressor (1) includes a stepped back plate (11) and a trapezoidal stop (12) connected to the middle of the stepped back plate (11) by a rotating shaft (13) and a torsion spring. An electromagnetic plate (14) is fixedly installed on the upper half of the stepped back plate (11) near the end face of the trapezoidal stop (12). The power on and off of the electromagnetic plate (14) is controlled by a controller. Vertical guide rails (203) are fixedly connected to the left and right inner walls of the I-shaped column. The two ends of the rotating shaft (13) are slidably connected to the two vertical guide rails (203) respectively. The stepped back plate (11) has multiple guide rods (21) fixedly connected to its back side. The I-shaped column has multiple sets of guide grooves (201) respectively corresponding to multiple reverse suppressors (1). The number of guide grooves (201) in each set is consistent with the number of guide rods (21) on the corresponding reverse suppressor (1). The guide rods (21) move through the guide grooves (201) and are fastened with fastening nuts (202). A rubber sheet (22) is fixedly connected to the bottom of the guide grooves (201). The guide rods (21) and the rubber sheet (22) are in contact with each other.

2. The construction hoist fall protection buffer system according to claim 1, characterized in that: The rubber sheet (22) is made of a high-toughness material. The upper and lower edges of the guide groove (201) are semi-circular, and the middle part is rectangular. A gap is left directly below the connection between the guide rod (21) and the stepped back plate (11). The depth of the gap is no more than 2 / 3 of the diameter of the guide rod (21).

3. The construction hoist fall protection buffer system according to claim 2, characterized in that: The stepped back plate (11) and the electromagnetic plate (14) are respectively equipped with a lower pressure sensor (103) and an upper pressure sensor (102) at the ends away from the I-shaped column. The upper pressure sensor (102) is located above the lower pressure sensor (103), and the upper pressure sensor (102) and the lower pressure sensor (103) correspond to the middle of the long right-angle end and the short right-angle end of the trapezoidal stop (12), respectively. A rubber gasket (101) is fixedly attached to the outer end of the trapezoidal stop (12) near the upper half of the stepped back plate (11).

4. The construction hoist fall protection buffer system according to claim 3, characterized in that: When the trapezoidal stop (12) is not subjected to external force, it is in an inclined state, and the angle between the trapezoidal stop (12) and the upper part of the stepped back plate (11) is 30-60°. When the trapezoidal stop (12) is in a vertical state, it does not contact the cage that moves up and down. When the trapezoidal stop (12) is in a horizontal state, the length of the trapezoidal stop (12) that coincides with the cage from a top view angle is not less than half the length of the trapezoidal stop (12).

5. The construction hoist fall protection buffer system according to claim 4, characterized in that: The multi-level buffer energy dissipation unit also includes a secondary acceleration suppression unit installed in the vertical guide rail (203). The secondary acceleration suppression unit includes a retaining strip (4) fixedly connected between the left and right inner walls of the vertical guide rail (203) and multiple tensile strips (3) that transversely penetrate the two retaining strips (4) and the vertical guide rail (203).

6. The construction hoist fall protection buffer system according to claim 5, characterized in that: The retaining strip (4) is made of elastic, wear-resistant and high-temperature resistant material, and the distance between the two retaining strips (4) is less than the diameter of the rotating shaft (13). The two retaining strips (4) are fixedly inlaid with a number of corresponding metal springs at their close ends. The cross-section of the metal springs is arc-shaped and matches the rotating shaft (13).

7. The construction hoist fall protection buffer system according to claim 6, characterized in that: The tensile strip (3) includes two pairs of opposing spherical limiting hemispheres, a metal strip (32) that moves through the two pairs of limiting hemispheres, and an outer sheath (33) wrapped around the outer end of the metal strip (32). The two pairs of limiting hemispheres are located on both sides of the vertical guide rail (203) and abut against the vertical guide rail (203). The limiting hemisphere includes a limiting layer (311) and a occupant layer (312) fixedly connected to the end of the limiting layer (311). The limiting layer (311) and the occupant layer (312) are fixedly connected.

8. The construction hoist fall protection buffer system according to claim 7, characterized in that: The two limiting hemispheres have occupant layers (312) in contact with each other. The limiting layer (311) is a rigid structure, and the occupant layer (312) is an elastic structure. The maximum diameter of the limiting layer (311) is 3-5 times the diameter of the metal strip (32).

9. A construction hoist fall protection buffer system according to claim 8, characterized in that: The distance between two adjacent tensile bars (3) is less than the distance between two reverse suppressors (1) and not more than 3 times the distance between the upper and lower inner walls of the guide groove (201). The extreme position of the metal strip (32) when it is stretched downward is lower than the position of the next tensile bar (3).

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