Fall protection device

Abstract

A fall protection device, comprising an anti-falling body (100) and a rescue mechanism (40). The anti-falling body (100) comprises a housing assembly (10), and a transmission shaft (11), a rope pulley assembly (30) and a first transmission assembly (20) arranged in the housing assembly (10). The rope pulley assembly (30) and the first transmission assembly (20) are transmittingly connected to the transmission shaft (11), respectively. The rescue mechanism (40) is arranged on the housing assembly (10), and the rescue mechanism (40) comprises a second transmission assembly (41) and a rescue shaft (42). The second transmission assembly (41) is adapted to switch between a rescue state and a non-rescue state; in the rescue state, the second transmission assembly (41) transmittingly engages with the first transmission assembly (20), and by driving the rescue shaft (42) to move, the rope pulley assembly (30) moves synchronously; and in the non-rescue state, the second transmission assembly (41) is separated from the first transmission assembly (20).

Description

fall protection equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310900320.1 filed on July 20, 2023, with application name “Fall Protection Device” and Chinese patent application No. 202321924670.3 filed on July 20, 2023, with application name “Fall Protection Buffering Rescue Device”, all of which are incorporated into this application by reference. Technical Field

[0003] The present invention relates to the technical field of anti-fall equipment, and in particular to a fall protection device. Background Art

[0004] A fall protection automatic speed controller, also known as a fall arrester, is used to protect workers from falling at heights. Mounted on an anchor point, the automatic speed controller contains a retractable safety rope, the end of which is connected to the worker's safety belt. If a worker falls, the rope is quickly pulled out, triggering the internal mechanism of the speed controller to lock and brake within a specified distance, protecting the worker.

[0005] In the related art, when a worker falls accidentally and is braked and protected by the fall protection speed differential automatic controller, other rescuers are required to connect the rescue rope to the safety belt of the worker who fell accidentally, and then transfer the worker who fell accidentally to the platform by raising and lowering the rescue rope.

[0006] During the above rescue process, if the working area where the worker who has fallen accidentally is located is small, or the worker who has fallen accidentally is in a coma due to the impact of the fall, it is difficult to connect the rescue rope to the safety belt of the worker who has fallen accidentally, which adds difficulties and challenges to the rescue work. If the rescue time is too long, it may endanger the life safety of the worker.

[0007] Summary of the Invention

[0008] The present invention provides a fall protection device with an additional rescue function. During the rescue process, there is no need to additionally connect a rescue rope to the safety belt of an operator who accidentally falls. The rescue work is simple and time-saving, and is not affected by the space restrictions of the operating area or the status of the operator.

[0009] In order to achieve the above object, the present invention provides a fall protection device, comprising:

[0010] The anti-fall body includes a housing assembly, and a transmission shaft, a rope pulley assembly, and a first transmission assembly arranged in the housing assembly, wherein the rope pulley assembly and the first transmission assembly are respectively connected to the transmission shaft in a transmission manner;

[0011] A rescue mechanism is provided in the housing assembly, and the rescue mechanism includes a second transmission assembly and a rescue shaft. The second transmission assembly is suitable for switching between a rescue state and a non-rescue state. In the rescue state, the second transmission assembly cooperates with the first transmission assembly to drive the rescue shaft to move, thereby causing the pulley assembly to move synchronously; in the non-rescue state, the second transmission assembly is separated from the first transmission assembly.

[0012] The fall protection device provided by the present invention is capable of switching between a rescue state and a non-rescue state by arranging a rescue mechanism on the shell assembly of the fall protection body. When the second transmission assembly is in the rescue state, the second transmission assembly cooperates with the first transmission assembly to drive the rescue shaft to move, so that the pulley assembly moves synchronously to realize rope collection and rope release, thereby lifting the accidentally fallen worker to the platform, or lowering the accidentally fallen worker to the platform for rescue. This rescue process does not require the additional connection of the rescue rope to the safety belt of the accidentally fallen worker. The rescue work is simple, time-consuming, and not affected by the space restrictions of the working area or the state of the worker. When the second transmission assembly is in the non-rescue state, the second transmission assembly is separated from the first transmission assembly, which is equivalent to the fall protection device maintaining its original fall protection function. Even if a rescue mechanism is added, the use of the original function of the fall protection device will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0014] FIG1 is a perspective view of a fall protection device provided in an embodiment of the present invention;

[0015] FIG2 is a side view of a fall protection device provided by an embodiment of the present invention;

[0016] FIG3 is a front view of a fall protection device provided in an embodiment of the present invention;

[0017] FIG4 is a cross-sectional view taken along line AA in FIG3 ;

[0018] 5 is a cross-sectional view of the layout structure of the fall protection device provided in an embodiment of the present invention;

[0019] 6 is a cross-sectional view of a locking mechanism of a fall protection device provided in an embodiment of the present invention;

[0020] FIG7 is a schematic diagram of an exploded view of the structure of the fall protection device provided by the present invention;

[0021] FIG8 is a second exploded schematic diagram of the structure of the fall protection device provided by the present invention.

[0022] Figures: 100, anti-fall body; 10, housing assembly; 11, transmission shaft; 12, housing body; 121, first accommodating chamber; 122, second accommodating chamber; 13, first cover; 14, second cover; 15, lifting ring; 20, first transmission assembly; 21, first transmission gear; 22, first friction plate; 23, first pressure plate; 24, nut; 25, disc spring; 30, pulley assembly; 31, wheel body; 311, wheel body; 312, stopper; 313, baffle; 32, rope; 40, rescue mechanism; 41, second transmission assembly; 411, second transmission gear; 412, gear sleeve; 4121, sleeve body; 4122, limiting portion; 42, rescue shaft; 421, threaded segment; 422. Limiting section; 43. Ratchet assembly; 431. Ratchet body; 432. Check member; 4321. Check member; 4322. Elastic member; 4323. Fastener; 433. Second friction plate; 44. Limiting assembly; 441. Limiting sleeve; 4411. First limiting groove; 4412. Second limiting groove; 442. Limiting member; 45. Driving component; 451. Handle; 452. Grip; 46. Bushing; 47. Support sleeve; 471. Guide hole; 50. Locking assembly; 51. Gear body; 52. Brake plate; 53. Swing lock block; 54. Elastic element; 55. Third friction plate; 56. Second pressure plate; 60. Rope return assembly; 61. Rope return spring; 62. Adjusting ring. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] With current fall protection devices, when a worker falls accidentally and is braked by the fall protection speed differential automatic controller, other rescuers are required to connect the rescue rope to the safety belt of the worker who has fallen accidentally, and then transfer the worker who has fallen accidentally to the platform by raising and lowering the rescue rope.

[0025] During the above-mentioned rescue process, if the work area where the worker accidentally falls is small (for example, underground or in a sewer), or if the worker accidentally falls unconscious due to the impact of the fall, it is difficult to connect the rescue rope to the worker's safety belt, which increases the difficulty and challenge of the rescue work. If the rescue time is too long, it may endanger the worker's life. To this end, the present invention provides a fall protection device that integrates a rescue device and a fall protection device so that the fall protection device has a rescue function.

[0026] The embodiments of the present invention are described below with reference to Figures 1 to 8. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any limitation to the present invention.

[0027] The fall protection device provided by the embodiments of the present invention includes a speed differential automatic controller, a self-locking speed differential, and a speed differential fall arrester. This fall protection device can be applied to lifting equipment such as free-climbing devices, elevators, and manned lifting devices for offshore platforms. It can also be applied to protective structures such as lifelines, safety ropes, and safety belts used in aerial work. Examples of aerial work include circuit maintenance, high-altitude glass curtain wall cleaning, and aerial installation.

[0028] As shown in Figure 1, it is a three-dimensional diagram of a fall protection device provided in an embodiment of the present invention; Figure 2 is a side view of a fall protection device provided in an embodiment of the present invention; Figure 3 is a front view of a fall protection device provided in an embodiment of the present invention; Figure 4 is a sectional view along line AA in Figure 3; Figure 5 is a sectional view of the layout structure of the fall protection device provided in an embodiment of the present invention; Figure 6 is a sectional view of the locking mechanism of the fall protection device provided in an embodiment of the present invention; Figure 7 is one of the structural explosion diagrams of the fall protection device provided in the present invention; Figure 8 is a second structural explosion diagram of the fall protection device provided in the present invention.

[0029] The fall protection device provided in the embodiment of the present invention includes a fall protection body 100 and a rescue mechanism 40, which is equivalent to the fall protection body 100 being the original fall protection device and the rescue mechanism 40 being a new fall protection device attached to the fall protection device so that the fall protection device has a rescue function.

[0030] Among them, the anti-fall body 100 includes a shell assembly 10, and a transmission shaft 11, a pulley assembly 30 and a first transmission assembly 20 arranged in the shell assembly 10. The pulley assembly 30 and the first transmission assembly 20 are respectively connected to the transmission shaft 11. When the pulley assembly 30 rotates, it can drive the transmission shaft 11 to rotate synchronously, and then the transmission shaft 11 drives the first transmission assembly 20 to move synchronously; conversely, the first transmission assembly 20 can also drive the transmission shaft 11 to move, and then the transmission shaft 11 drives the pulley assembly 30 to move.

[0031] The rescue mechanism 40 is arranged in the shell assembly 10. The rescue mechanism 40 includes a second transmission assembly 41 and a rescue shaft 42. The second transmission assembly 41 can switch between a rescue state and a non-rescue state. In the rescue state, the second transmission assembly 41 cooperates with the first transmission assembly 20 to drive the rescue shaft 42 to move to drive the transmission shaft 11 to move, so that the pulley assembly 30 moves synchronously to reel in and release the rope, that is, the movement of the rescue shaft 42 can transmit the torque to the transmission shaft 11 through the second transmission assembly 41 and the first transmission assembly 20, so that the transmission shaft 11 drives the pulley assembly 30 to move; in the non-rescue state, the second transmission assembly 41 is separated from the first transmission assembly 20. At this time, the second transmission assembly 41 and the first transmission assembly 20 can be staggered by a certain position, or there is a certain gap between the second transmission assembly 41 and the first transmission assembly 20, and the second transmission assembly 41 and the first transmission assembly 20 cannot transmit the torque between the rescue shaft 42 and the transmission shaft 11 to each other.

[0032] It will be appreciated that the fall protection device provided in the embodiments of the present invention, by providing a rescue mechanism 40 on the housing assembly 10 of the fall protection body 100, allows the second transmission assembly 41 of the rescue mechanism 40 to switch between a rescue state and a non-rescue state. When in the rescue state, the second transmission assembly 41 cooperates with the first transmission assembly 20, driving the rescue shaft 42 to move the transmission shaft 11, causing the sheave assembly 30 to move synchronously to reel in and release the rope, thereby lifting a fallen worker to the platform or lowering the fallen worker to the platform for rescue. This rescue process eliminates the need to connect the rescue rope 32 to the worker's safety belt, simplifying the rescue operation and shortening the time required. The rescue operation is not affected by the spatial constraints of the work area or the worker's condition. When in the non-rescue state, the second transmission assembly 41 is separated from the first transmission assembly 20, effectively maintaining the fall protection device's original fall protection function. The addition of the rescue mechanism 40 does not affect the original function of the fall protection device.

[0033] As shown in Figures 4 and 7, in some embodiments of the present invention, the rescue mechanism 40 further includes a ratchet assembly 43 and a limiting assembly 44. The rescue shaft 42 is provided with a threaded section 421 and a limiting section 422 at intervals along its axial direction, and the second transmission assembly 41 is threadedly connected to the threaded section 421; the ratchet assembly 43 is provided between the threaded section 421 and the limiting section 422, and the ratchet assembly 43 and the rescue shaft 42 are relatively rotatable; the limiting assembly 44 is provided on the side of the limiting section 422 away from the ratchet assembly 43, so as to keep the second transmission assembly 41 in a rescue state or a non-rescue state, that is, the limiting assembly 44 can limit the rescue shaft 42 to the housing assembly 10 to prevent the rescue shaft 42 from moving arbitrarily along its own axial direction.

[0034] When the second transmission assembly 41 switches to the rescue state, the limit assembly 44 limits the position of the rescue shaft 42, thereby keeping the second transmission assembly 41 in the rescue state. At this time, the second transmission assembly 41 and the first transmission assembly 20 are in transmission cooperation, and there are the following two rescue situations:

[0035] For example, if a worker who has fallen accidentally is located underground or in a sewer and needs to be lifted to the ground (platform), the rescue shaft 42 can be driven forward to rotate so that the rescue shaft 42 drives the second transmission assembly 41 to move to the extrusion ratchet assembly 43 until the friction force generated between the second transmission assembly 41 and the ratchet assembly 43 can drive the second transmission assembly 41 to rotate, thereby driving the first transmission assembly 20 to rotate. The first transmission assembly 20 drives the transmission shaft 11 to rotate, so that the pulley assembly 30 rotates to collect the rope, thereby lifting the worker who has fallen accidentally.

[0036] When lifting an operator who has fallen accidentally, if the forward driving force of the rescue shaft 42 disappears, the operator who has fallen accidentally will quickly pull out the rope 32 of the sheave assembly 30 under the action of his own gravity, so that the sheave assembly 30 rotates, and then the sheave assembly 30 drives the transmission shaft 11 to rotate. The transmission shaft 11 has a tendency to drive the first transmission assembly 20 to rotate, and the first transmission assembly 20 has a tendency to drive the second transmission assembly 41 to rotate. Since the second transmission assembly 41 is in squeeze contact with the ratchet assembly 43, and the position of the ratchet assembly 43 remains fixed, the friction between the second transmission assembly 41 and the ratchet assembly 43 will limit the rotation of the second transmission assembly 41. When the second transmission assembly 41 cannot rotate, the first transmission assembly 20 that is in transmission cooperation with the second transmission assembly 41 cannot continue to rotate, and the operator who has fallen accidentally will not be at risk of falling again.

[0037] For example, if a worker accidentally falls in mid-air and needs to be lowered to the ground (platform), the rescue shaft 42 is driven in the reverse direction to cause the rescue shaft 42 to drive the second transmission assembly 41 to move away from the ratchet assembly 43 until the friction between the second transmission assembly 41 and the ratchet assembly 43 disappears. Under the action of the worker's own weight, the worker quickly pulls out the rope 32 of the sheave assembly 30 to descend. During the descent, the sheave assembly 30 rotates to drive the transmission shaft 11, which in turn drives the first transmission assembly 20. The first transmission assembly 20 drives the second transmission assembly 41, causing the second transmission assembly 41 to gradually move closer to the ratchet assembly 43, squeezing the ratchet assembly 43 and generating friction between the second transmission assembly 41 and the ratchet assembly 43. At this time, continue to drive the rescue shaft 42 in the reverse direction to rotate, so that the rescue shaft 42 drives the second transmission assembly 41 to move a certain distance away from the ratchet assembly 43 until the friction generated between the second transmission assembly 41 and the ratchet assembly 43 disappears. The worker who accidentally falls will quickly pull out the rope 32 of the pulley assembly 30 under the action of his own gravity to descend. Repeating this process can land the worker who accidentally falls.

[0038] When the worker who has fallen accidentally is lowered, if the reverse driving force of the rescue shaft 42 disappears, the worker who has fallen accidentally will quickly pull out the rope 32 of the pulley assembly 30 under the action of his own gravity, so that the pulley assembly 30 rotates, and then the pulley assembly 30 drives the transmission shaft 11 to rotate, and the transmission shaft 11 drives the first transmission assembly 20 to rotate, and the first transmission assembly 20 drives the second transmission assembly 41 to rotate until the second transmission assembly 41 is squeezed into contact with the ratchet assembly 43, and the position of the ratchet assembly 43 remains fixed. Therefore, the friction between the second transmission assembly 41 and the ratchet assembly 43 will limit the rotation of the second transmission assembly 41. When the second transmission assembly 41 cannot rotate, the first transmission assembly 20 that is coordinated with the second transmission assembly 41 cannot continue to rotate, and the worker who has fallen accidentally will not be at risk of falling again.

[0039] This is equivalent to when the rescue organization 40 switches to the rescue state, no matter whether the rescue organization 40 lifts the worker who has fallen accidentally or drops the worker who has fallen accidentally, the rescue organization 40 has the anti-fall function of the fall protection device, which can avoid the accidental falling of the fall protection device during the rescue process, so as to make the fall protection device safer.

[0040] In addition, the forward drive and reverse drive mentioned in the above embodiments are relative concepts. For example, if the forward drive is clockwise rotation, then the reverse drive is counterclockwise rotation. Alternatively, the forward drive may be counterclockwise rotation and the reverse drive may be clockwise rotation.

[0041] As shown in Figures 4 and 7, in some embodiments of the present invention, the limiting assembly 44 includes a limiting sleeve 441 and a limiting member 442. The limiting sleeve 441 is a cylinder corresponding to the structure of the rescue shaft 42. The limiting sleeve 441 is sleeved on the rescue shaft 42. The limiting sleeve 441 and the rescue shaft 42 can be interference fit or plane fit, and can also be fixed by key connection so that the limiting sleeve 441 can move synchronously with the rescue shaft 42.

[0042] The outer circumferential surface of the limiting sleeve 441 is provided with a first limiting groove 4411 and a second limiting groove 4412 , and the first limiting groove 4411 and the second limiting groove 4412 are spaced apart along the axial direction of the limiting sleeve 441 .

[0043] The limiting member 442 is movably provided on the housing assembly 10 and cooperates with the first limiting groove 4411 or the second limiting groove 4412 to limit the position so as to keep the second transmission assembly 41 in the rescue state or the non-rescue state.

[0044] For example, when the second transmission assembly 41 is in the non-rescue state, the limiting member 442 passes through the housing assembly 10 and is confined within the first limiting groove 4411 to limit the axial movement of the rescue shaft 42. Since the first limiting groove 4411 is provided on the outer circumferential surface of the limiting sleeve 441, that is, the first limiting groove 4411 is provided along the circumference of the limiting sleeve 441, when the rescue shaft 42 rotates, the first limiting groove 4411 rotates under the guidance of the limiting member 442 to maintain the position of the rescue shaft 42, thereby accurately pairing the second transmission assembly 41 with the first transmission assembly 20.

[0045] When the second transmission assembly 41 is in the rescue state, the limiting piece 442 is pulled out from the shell assembly 10 to disengage the limiting piece 442 from the first limiting groove 4411, pushing the rescue shaft 42 to move along its own axial direction, so that the limiting sleeve 441 moves with the rescue shaft 42, and the second limiting groove 4412 is located at the position of the limiting piece 442, and the limiting piece 442 is inserted into the second limiting groove 4412 to limit the position of the rescue shaft 42. At this time, the second transmission assembly 41 is accurately matched with the first transmission assembly 20.

[0046] Among them, the limiting member 442 can be a component such as a plunger, a pin or a bolt. An external thread can be provided on the outer circumferential surface of the limiting member 442, and a threaded hole can be provided on the shell assembly 10. The limiting member 442 is threadedly connected in the threaded hole of the shell assembly 10. The preload force is adjusted and the positioning and limiting functions are realized by controlling the screw-in depth of the limiting member 442.

[0047] In addition, the limiting assembly 44 can also be a limiting protrusion arranged on the rescue shaft 42, and a limiting sleeve arranged on the shell assembly 10, with two limiting grooves spaced apart on the inner wall surface of the limiting sleeve. The limiting sleeve is fixed to the outer surface of the shell assembly 10 by fasteners such as bolts, and the position of the rescue shaft 42 is switched by adjusting the position of the limiting protrusion and the two limiting grooves.

[0048] As shown in Figures 4 to 7, in some embodiments of the present invention, the ratchet assembly 43 includes a ratchet body 431 and a non-return component 432. The ratchet body 431 and the rescue shaft 42 are relatively rotatable, that is, the ratchet body 431 can rotate relative to the rescue shaft 42, and the rescue shaft 42 can also rotate relative to the ratchet body 431. The non-return component 432 is provided in the housing assembly 10. The non-return component 432 is located between two adjacent ratchet teeth of the ratchet body 431, or the non-return component 432 abuts against the tooth top of one of the ratchet teeth of the ratchet body 431 to limit the rotation direction of the ratchet body 431, so that the ratchet body 431 rotates in one direction, restricting the ratchet assembly 43 from returning.

[0049] That is, when the ratchet body 431 rotates along the setting direction of the ratchet teeth, the ratchet teeth squeeze the non-return component 432, so that the non-return component 432 is elastically deformed, and the non-return component 432 slides from the tooth back of the ratchet teeth, and the non-return component 432 does not restrict the rotation of the ratchet body 431.

[0050] When the ratchet body 431 rotates in the direction opposite to the setting direction of the ratchet teeth, the anti-return component 432 recovers its elastic deformation to stop the ratchet body 431 from rotating, so that the ratchet body 431 remains stationary.

[0051] For example, when lifting a worker who has fallen accidentally, if the forward driving force of the rescue shaft 42 disappears, the worker who has fallen accidentally will quickly pull out the rope 32 of the sheave assembly 30 under the action of his own gravity, so that the sheave assembly 30 rotates, and then the sheave assembly 30 drives the transmission shaft 11 to rotate. The transmission shaft 11 has a tendency to drive the first transmission assembly 20 to rotate, and the first transmission assembly 20 has a tendency to drive the second transmission assembly 41 to rotate. The second transmission assembly 41 is in squeeze contact with the ratchet body 431, and the ratchet body 431 is positioned by the non-return component 432, so that the position of the ratchet body 431 remains unchanged. Therefore, the friction between the second transmission assembly 41 and the ratchet body 431 will limit the rotation of the second transmission assembly 41. When the second transmission assembly 41 cannot rotate, the first transmission assembly 20 that is in transmission with the second transmission assembly 41 cannot continue to rotate, and the worker who has fallen accidentally will not be at risk of falling again.

[0052] For example, when an operator who has fallen accidentally is lowered, if the reverse driving force of the rescue shaft 42 disappears, the operator who has fallen accidentally will quickly pull out the rope 32 of the pulley assembly 30 under the action of his own gravity, so that the pulley assembly 30 rotates, and then the pulley assembly 30 drives the transmission shaft 11 to rotate, and the transmission shaft 11 drives the first transmission assembly 20 to rotate, and the first transmission assembly 20 drives the second transmission assembly 41 to rotate until the second transmission assembly 41 is squeezed into contact with the ratchet body 431. The ratchet body 431 is positioned by the non-return component 432 to keep the position of the ratchet body 431 fixed. Therefore, the friction between the second transmission assembly 41 and the ratchet body 431 will limit the rotation of the second transmission assembly 41. When the second transmission assembly 41 cannot rotate, the first transmission assembly 20 that is transmitted with the second transmission assembly 41 cannot continue to rotate, and the operator who has fallen accidentally will not be at risk of falling again.

[0053] In the embodiment of the present invention, the ratchet body 431 is positioned by the anti-return component 432 to prevent the ratchet body 431 from reversing and keep the ratchet body 431 relatively still, thereby enabling the second transmission assembly 41 to have a good anti-falling function in the rescue state.

[0054] As shown in Figures 5 and 7, specifically, the check component 432 includes a check member 4321, an elastic member 4322 and a fastener 4323. The check member 4321 abuts against the ratchet body 431, the elastic member 4322 is respectively connected to the check member 4321 and the fastener 4323, and the fastener 4323 is fixedly connected to the shell assembly 10.

[0055] When the ratchet body 431 rotates along the setting direction of the ratchet teeth, the ratchet teeth press the backstop 4321 to elastically deform the elastic member 4322 and the backstop 4321 slides from the tooth back of the ratchet teeth.

[0056] When the ratchet body 431 rotates in the direction opposite to the setting direction of the ratchet teeth, the elastic member 4322 recovers its elastic deformation to push up the stop member 4321 . The stop member 4321 blocks the ratchet body 431 from rotating, so that the ratchet body 431 remains stationary.

[0057] The stopper 4321 may be a push pin, the elastic member 4322 may be a spring, a spring sheet, etc., and the fastener 4323 may be a screw, a bolt, etc. In order to make the stopper 4321 slide more easily from the back of the ratchet tooth, the stopper 4321 may be configured as a hemispherical structure.

[0058] In addition, in addition to the above-mentioned structure, the anti-return component 432 can also be an elastic pin, an elastic plunger, or other positioning component for preventing the ratchet body 431 from reversing.

[0059] As shown in Figures 4 and 7, in some embodiments of the present invention, in order to increase the friction coefficient of the ratchet body 431, a second friction plate 433 is provided on at least one side of the ratchet body 431. That is, the second friction plate 433 can be provided on either side of the ratchet body 431, the second friction plate 433 being located between the second transmission assembly 41 and the ratchet body 431, or the second friction plate 433 being located between the ratchet body 431 and the limiting section 422. Alternatively, the second friction plate 433 can be provided on both sides of the ratchet body 431.

[0060] The second friction plate 433 is rotatably arranged with the rescue shaft 42. That is, a through hole is provided in the center of the second friction plate 433, and the second friction plate 433 is sleeved on the rescue shaft 42 so as to be able to rotate relative to the rescue shaft 42 to achieve buffering.

[0061] Specifically, accommodating grooves corresponding to the structure of the second friction plate 433 may be opened on both sides of the ratchet body 431 , and the second friction plate 433 is embedded in the accommodating grooves to form an integral component with the ratchet body 431 .

[0062] Drive the rescue shaft 42 in the forward direction to rotate, so that the rescue shaft 42 drives the second transmission assembly 41 to move to squeeze the second friction plate 433 and the ratchet body 431, until the friction force generated between the second transmission assembly 41 and the second friction plate 433 and the ratchet body 431 can drive the second transmission assembly 41 to rotate, thereby driving the first transmission assembly 20 to rotate, and then driving the rope pulley assembly 30 to rotate through the transmission shaft 11 to collect the rope, so as to achieve the lifting of the worker who accidentally fell.

[0063] During the rescue process, the second transmission component 41 moves to squeeze the second friction plate 433 and the ratchet body 431 until the friction force generated between the second transmission component 41 and the second friction plate 433 and the ratchet body 431 can drive the second transmission component 41 to rotate, or the method of stopping the second drive component can be the same as the above method, which will not be repeated here.

[0064] In an embodiment of the present invention, a second friction plate 433 is provided on at least one side of the ratchet body 431 to increase the friction between the second transmission component 41 and the ratchet body 431, so that the friction force generated by the second transmission component 41 squeezing the ratchet body 431 and the second friction plate 433 is more stable, ensuring that the operation of the rescue mechanism 40 is more reliable.

[0065] Furthermore, since the second friction plate 433 and the rescue shaft 42 are rotatably arranged, if the fallen person is at risk of falling again during the rescue process of the rescue mechanism 40, the ratchet assembly 43 can brake the fallen person within a limited distance and provide buffering at the same time, so as to reduce the falling impact force on the fallen person and further improve the safety and reliability of the fall protection device.

[0066] As shown in FIG. 7 , in some embodiments of the present invention, the second transmission assembly 41 includes a second transmission gear 411 , and the second transmission gear 411 is threadedly engaged with the threaded section 421 of the rescue shaft 42 .

[0067] Drive the rescue shaft 42 in the forward direction to rotate, so that the rescue shaft 42 drives the second transmission gear 411 to move to squeeze the second friction plate 433 and the ratchet body 431, until the friction force generated between the second transmission gear 411 and the second friction plate 433 and the ratchet body 431 can drive the second transmission gear 411 to rotate, thereby driving the first transmission assembly 20 to rotate, and then driving the pulley assembly 30 to rotate through the transmission shaft 11 to collect the rope, so as to achieve the lifting of the worker who fell accidentally.

[0068] As shown in Figures 4 and 7, in some embodiments of the present invention, the second transmission assembly 41 also includes a gear sleeve 412, which is threadedly engaged with the threaded section 421 of the rescue shaft 42, and the second transmission gear 411 is sleeved on the gear sleeve 412 and fixedly connected to the gear sleeve 412.

[0069] Drive the rescue shaft 42 in the forward direction to rotate, so that the rescue shaft 42 drives the gear sleeve 412 and the second transmission gear 411 to move to squeeze the second friction plate 433 and the ratchet body 431, until the friction force generated between the gear sleeve 412 and the second transmission gear 411 and the second friction plate 433 and the ratchet body 431 can drive the second transmission gear 411 to rotate, thereby driving the first transmission assembly 20 to rotate, and then driving the pulley assembly 30 to rotate through the transmission shaft 11 to collect the rope, so as to achieve the lifting of the worker who accidentally fell.

[0070] In this embodiment of the present invention, the second transmission gear 411 is threadedly connected to the threaded section 421 of the rescue shaft 42 via the gear sleeve 412. This simplifies the structural configuration of the second transmission gear 411 and reduces the production cost of the second transmission gear 411. Furthermore, the second transmission gear 411 is secured by the gear sleeve 412, making it easy to replace the gear sleeve 412. The cooperation between the rescue shaft 42 and the gear sleeve 412 is similar to a screw-nut pair, with the rescue shaft 42 acting as a screw and the gear sleeve 412 acting as a screw-nut.

[0071] As shown in Figure 7, in some embodiments of the present invention, the gear sleeve 412 includes a sleeve body 4121 and a limiting portion 4122 protruding from the surface of the sleeve body 4121, so that the longitudinal cross-section of the gear sleeve 412 is similar to a "T" shape, and the longitudinal cross-section of the gear sleeve 412 is a cross-section along the axial direction of the gear sleeve 412.

[0072] The second transmission gear 411 is sleeved within the sleeve body 4121. A flat surface is machined on the outer circumferential surface of the sleeve body 4121, and the second transmission gear 411 is provided with a flat surface corresponding to the flat surface. The second transmission gear 411 and the sleeve body 4121 are connected via the flat surface to restrict relative movement between the second transmission gear 411 and the sleeve body 4121. The second transmission gear 411 is also fixedly connected to a stopper 4122 via fasteners such as screws and bolts to restrict axial movement of the second transmission gear 411 along the sleeve body 4121. The stopper 4122 serves to limit the position of the second transmission gear 411, preventing it from contacting other components of the fall protection device and causing wear.

[0073] Alternatively, the gear sleeve 412 may be a cylindrical sleeve, with a width greater than or equal to that of the second transmission gear 411. A threaded hole is provided at the center of the gear sleeve 412, through which the gear sleeve 412 engages with the threaded section 421 of the rescue shaft 42. A flat surface is machined on the outer circumferential surface of the gear sleeve 412, and the second transmission gear 411 is provided with a flat surface corresponding to the flat surface. The second transmission gear 411 and the gear sleeve 412 are connected by the flat surface to restrict relative movement between the second transmission gear 411 and the gear sleeve 412.

[0074] As shown in Figures 4, 5 and 7, in some embodiments of the present invention, the rescue shaft 42 has a first end and a second end that are relatively arranged. The first end is passed through the shell assembly 10, extends out of the shell assembly 10 and is located outside the shell assembly 10. The first end is provided with a driving component 45 for driving the rescue shaft 42 to move, and the second end is guided and cooperated with the shell assembly 10.

[0075] When it is necessary to lift a worker who has fallen accidentally to the ground (platform), the rescue shaft 42 is driven in the forward direction by the driving component 45, so that the rescue shaft 42 drives the second transmission assembly 41 to move to the extrusion ratchet assembly 43 until the friction force generated between the second transmission assembly 41 and the ratchet assembly 43 can drive the second transmission assembly 41 to rotate, thereby driving the first transmission assembly 20 to rotate, and then driving the rope pulley assembly 30 to rotate through the transmission shaft 11 to collect the rope, so as to achieve the lifting of the worker who has fallen accidentally.

[0076] As shown in FIG7 , the rescue shaft 42 is a stepped shaft, and the limiting section 422 can be a limiting step provided on the rescue shaft 42 , or a limiting groove provided on the rescue shaft 42 , in which a retaining spring or a stop plate is provided.

[0077] When the limiting section 422 is an upper limiting groove provided on the rescue shaft 42 and a retaining spring is provided in the limiting groove, the limiting section 422 can also be limited by the limiting assembly 44 .

[0078] When driving the rescue shaft 42 in the forward direction, the rescue shaft 42 drives the gear sleeve 412 and the second transmission gear 411 to move to squeeze the second friction plate 433 and the ratchet body 431, and friction occurs between the second friction plate 433 or the ratchet body 431 and the limiting section 422. The position of the second friction plate 433 or the ratchet body 431 is limited by the limiting section 422, so that the friction force generated between the gear sleeve 412 and the second transmission gear 411 and the second friction plate 433 and the ratchet body 431 can drive the second transmission gear 411 to rotate, thereby driving the first transmission assembly 20 to rotate, and then driving the pulley assembly 30 to rotate through the transmission shaft 11 to collect the rope, so as to lift the operator who accidentally fell.

[0079] Specifically, the driving component 45 can be a driving component 45 that is driven manually. For example, the driving component 45 includes a handle 451 and a grip 452. As shown in Figures 1, 2, and 4 to 8, a connecting block is provided at the first end of the rescue shaft 42 along the axial extension. The cross-sectional shape of the connecting block can be a polygon, and the polygon can be a regular polygon, an irregular polygon, a convex polygon, or a concave polygon. That is, the connecting block has multiple connecting planes. When the cross-sectional shape of the connecting block is a square, a square hole that is adapted to the shape of the connecting block is provided on the handle 451. The handle 451 is sleeved on the connecting block through the square hole and clamped with the connecting block, that is, the handle 451 has an interference fit with the connecting block.

[0080] In addition, in order to prevent the handle 451 from being separated from the connecting block, a gasket and a bolt may be used to fix the handle 451 to the connecting block.

[0081] As shown in Figures 4, 5 and 7, in some embodiments of the present invention, the second end of the rescue shaft 42 is provided with a brass bushing 46, which can reduce the friction of the rescue shaft 42 moving along the axial direction, so that the rescue shaft 42 can switch positions more smoothly.

[0082] In addition, a support sleeve 47 is provided on the housing assembly 10 . The support sleeve 47 defines a guide hole 471 . The bushing 46 is disposed in the guide hole 471 and slidably engages with the wall of the guide hole 471 .

[0083] When it is necessary to lift a worker who has fallen accidentally to the ground (platform), it is necessary to first pull out the limit piece 442, and then push the rescue shaft 42 to move through the driving component 45, so that the bushing 46 slides along the hole wall of the guide hole 471, so that the position of the rescue shaft 42 changes, and then drives the second transmission component 41 to move to switch to the rescue state.

[0084] Among them, the support sleeve 47 can be integrally formed with the shell assembly 10, and the support sleeve 47 can also be an independent component. When the support sleeve 47 is set independently, a mounting hole or positioning shaft is prefabricated on the shell assembly 10 to fix the support sleeve 47 on the mounting hole or positioning shaft.

[0085] As shown in Figures 4, 5 and 7, in some embodiments of the present invention, the first transmission assembly 20 includes a first transmission gear 21 and a first friction plate 22, and the first friction plate 22 is pressed against both sides of the first transmission gear 21; wherein the first friction plate 22 is in transmission cooperation with the transmission shaft 11, and the first transmission gear 21 and the transmission shaft 11 can rotate relative to each other.

[0086] The first transmission gear 21 has a circular hole formed therein. The first transmission gear 21 is mounted on the transmission shaft 11 and is rotatable relative to the transmission shaft 11. The first friction plate 22 can be connected to the transmission shaft 11 by an interference fit or by a flat surface. When the first friction plate 22 is connected to the transmission shaft 11 by a flat surface, the cross-section of the transmission shaft 11 corresponding to the mounting location of the first friction plate 22 can be configured as a polygon. The polygon can be a regular polygon, an irregular polygon, a convex polygon, or a concave polygon. In other words, the transmission shaft 11 has multiple connection flat surfaces at corresponding locations. A through-hole is formed in the center of the first friction plate 22 to match the shape of the transmission shaft 11. After the first friction plate 22 is mounted on the transmission shaft 11, it can move synchronously with the transmission shaft 11.

[0087] In addition, a first pressure plate 23 can be set on the outside of the first friction plate 22, that is, the first pressure plate 23 is set on the side of the first friction plate 22 facing away from the first transmission gear 21, and a nut 24 and a disc spring 25 are set on the outside of the first pressure plate 23. The first pressure plate 23 is pressed against the first friction plate 22 and the first transmission gear 21 by the nut 24 and the disc spring 25.

[0088] The first pressure plate 23 is connected to the transmission shaft 11 in a planar manner. The first friction plate 22 and the transmission shaft 11 are capable of relative rotation, and the first transmission gear 21 is capable of relative rotation. During the fall arrest process, the transmission shaft 11 drives the first pressure plate 23 and the first friction plate 22 to rotate. The first friction plates 22 on either side of the first transmission gear 21 rotate relative to each other and rub against each other, dissipating the energy generated by the fall impact until the transmission shaft 11 stops rotating. Thus, during the fall arrest process, the relative rotational friction between the first friction plate 22 and the first transmission gear 21 acts as a buffer, reducing the instantaneous impact force acting on the worker during braking, thereby ensuring the worker's safety.

[0089] By providing the nut 24 and the disc spring 25, a certain pressure is generated on the first pressure plate 23, the first friction plate 22 and the first transmission gear 21, so that the first friction plate 22 and the first transmission gear 21 generate friction, forming a friction torque, which plays a buffering role and plays a certain compensation role for the first friction plate 22 after wear occurs, ensuring that the first friction plate 22 can be used multiple times to extend its service life.

[0090] In other embodiments, the first transmission assembly 20 may include only the first transmission gear 21, which is in transmission connection with the transmission shaft 11. For example, the first transmission gear 21 may be keyed to the transmission shaft 11, or the first transmission gear 21 may be fixedly connected to the sheave assembly 30. In the rescue state, the second transmission assembly 41 is in transmission cooperation with the first transmission gear 21, and the rescue shaft 42 is driven to move. The torque can be transmitted to the transmission shaft 11 through the second transmission assembly 41 and the first transmission gear 21, so that the transmission shaft 11 drives the sheave assembly 30 to move.

[0091] As shown in Figures 4 and 5 , in some embodiments of the present invention, the pulley assembly 30 includes a pulley body 31 and a rope 32. The pulley body 31 is drivingly connected to the transmission shaft 11, and the rope 32 is wound around the pulley body 31 and extends from the housing assembly 10. The rope 32 can be automatically returned to the housing assembly 10 by manual operation or by the rope return assembly 60 described below.

[0092] The wheel 31 can be keyed to the drive shaft 11 or connected to the drive shaft 11 via a flat surface. When the wheel 31 is keyed, a keyway is provided on the circumferential surface of the drive shaft 11 to provide a keyed connection between the wheel 31 and the drive shaft 11. Pulling the rope 32 along its free end rotates the wheel 31, which in turn rotates the drive shaft 11, transmitting the rotational force of the wheel 31 to the drive shaft 11.

[0093] When the wheel body 31 is connected to the transmission shaft 11 via a plane, the transmission shaft 11 can be configured as a prismatic column, that is, the cross-sectional shape of the transmission shaft 11 can be a polygon, which can be a regular polygon, an irregular polygon, a convex polygon, or a concave polygon. For example, if the cross-sectional shape of the portion of the transmission shaft 11 that mates with the wheel body 31 is a square, a through hole having the same cross-sectional shape as the transmission shaft 11 is formed in the wheel body 31, so that the wheel body 31 is interference-fitted onto the transmission shaft 11 through the through hole, thereby achieving a transmission connection between the wheel body 31 and the transmission shaft 11.

[0094] Specifically, the wheel body 31 includes a wheel body 311 and a stop portion 312. The stop portion 312 is provided at one end of the wheel body 311. The other end of the wheel body 311 is detachably connected to a baffle 313. A rope groove is defined between the baffle 313 and the stop portion 312. The rope 32 is limited in the rope groove, which can prevent the rope 32 from escaping from the wheel body 311 and being wound around the first transmission assembly 20 adjacent to the wheel body 311, thereby affecting the use of the first transmission assembly 20.

[0095] Since the second transmission assembly 41 is limited to the baffle 313 in the rescue state, the second transmission assembly 41 can be pushed into place, which facilitates the switching of the rescue mechanism 40. However, the baffle 313 is easily damaged by impact during a long period of time. Therefore, by detachably connecting the baffle 313 to the wheel body 311, it is convenient to remove and replace the baffle 313. In this way, if the baffle 313 is damaged, only the baffle 313 needs to be replaced without moving the entire wheel body 31.

[0096] In addition, since the baffle 313 and the wheel body 311 are rigidly connected by fasteners such as screws, and the first pressure plate 23 and the first friction plate 22 rotate synchronously with the wheel body 31, during the fall locking process, the wheel body 31 drives the transmission shaft 11 to rotate, and the rotation of the transmission shaft 11 drives the first pressure plate 23 in the first transmission assembly 20 to rotate, and the first friction plates 22 on both sides of the first transmission gear 21 and the first transmission gear 21 rotate and rub relative to each other to consume the energy generated by the fall impact until the transmission shaft 11 stops rotating, so as to prevent the falling person from being injured by excessive impact force.

[0097] It is understood that the baffle 313 can also be integrally formed with the wheel body 311, which is equivalent to providing the stopper 312 on both sides of the wheel body 311. In some embodiments, the baffle 313 can also be rigidly connected to the first transmission gear 21 via fasteners such as screws, so that the first transmission gear 21, the transmission shaft 11, and the wheel body 31 can rotate synchronously, ensuring stable torque transmission.

[0098] As shown in Figures 4 to 8, in some embodiments of the present invention, the anti-fall body 100 also includes a locking assembly 50 and a rope return assembly 60 that are transmission-connected to the transmission shaft 11. The locking assembly 50 is used to lock the fall protection device, and the rope return assembly 60 is used to collect the rope of the pulley assembly 30.

[0099] Specifically, the locking assembly 50 includes a tooth body 51, a brake plate 52, a swing lock block 53 and an elastic element 54; the tooth body 51 is fixed to the housing assembly 10, the brake plate 52 is transmission-connected to the transmission shaft 11, the swing lock block 53 is rotationally connected to the brake plate 52, and the elastic element 54 is respectively connected to the brake plate 52 and the swing lock block 53.

[0100] During use of the embodiment of the present invention, the brake plate 52 rotates together with the transmission shaft 11 , and the swing lock block 53 rotates along with the brake plate 52 . During the rotation, the end of the swing lock block 53 hits each tooth top on the tooth body 51 .

[0101] When the rotation speed of the transmission shaft 11 is less than the set value, the impact force between the swing lock block 53 and the tooth top of the tooth body 51 is less than the elastic force of the elastic element 54. The swing lock block 53 will not affect the rotation of the brake plate 52 under the action of the elastic element 54, that is, the swing lock block 53 will not enter the tooth root of the tooth body 51 and lock it, which can ensure the normal rotation of the transmission shaft 11.

[0102] When the rotational speed of the transmission shaft 11 exceeds a set value, the centrifugal force of the swing lock block 53 exceeds the elastic force of the elastic element 54. The swing lock block 53 overcomes the elastic force of the elastic element 54 and is thrown outward. The swing lock block 53 enters the root of the tooth body 51 and locks, causing the transmission shaft 11 to stop rotating. The rotation of the transmission shaft 11 drives the first pressure plate 23 and the first friction plate 22 to rotate. The first friction plates 22 on both sides of the first transmission gear 21 rotate relative to each other and rub against each other.

[0103] Therefore, when the operator loses control and falls, the rope 32 pulls the wheel body 31 to rotate rapidly, and the wheel body 31 synchronously drives the transmission shaft 11 to rotate rapidly. At this time, the rotation speed of the transmission shaft 11 exceeds the set value. The locking assembly 50 adopts the above principle to achieve locking to prevent the operator from falling accidentally, and can consume the energy generated by the fall impact when locking, which can play a buffering role and reduce the impact force on the operator, thereby improving the safety of the fall protection buffering and rescue device.

[0104] As shown in FIG4 and FIG5 , in some embodiments of the present invention, third friction plates 55 are provided on both sides of the brake plate 52 . The third friction plates 55 are in transmission cooperation with the transmission shaft 11 , and the brake plate 52 and the transmission shaft 11 can rotate relative to each other.

[0105] A second pressure plate 56 may be further provided on the outer side of the third friction plate 55 so that the second pressure plate 55 presses the third friction plate 55 and the brake plate 52 , and the second pressure plate 56 is connected to the transmission shaft 11 in a planar manner.

[0106] When the transmission shaft 11 rotates, the third friction plate 55 rotates with it, and the brake plate 52 rotates due to friction with the third friction plate 55, achieving braking. When the transmission shaft 11 stops rotating, the third friction plate 55 stops rotating along with the transmission shaft 11. At this time, the brake plate 52 continues to rotate due to inertia. The torque generated by the brake plate 52 is absorbed by the third friction plate 55, effectively mitigating impact and preventing excessive impact during the fall and locking process.

[0107] When the swing lock block 53 in the locking assembly 50 touches the tooth body 51, the torque generated by the impact force is greater than the torque generated by the friction between the two third friction plates 55 and the brake plate 52. The tooth body 51 will rotate relative to it, which will have a certain buffering effect on the impact force, reducing the impact on the falling person and avoiding injury.

[0108] Among them, the third friction plate 55 is also fixed to the transmission shaft 11 by the nut 24 and the disc spring 25. By setting the nut 24 and the disc spring 25, a certain pressure is generated on the second pressure plate 56, the third friction plate 55 and the brake plate 52, so that the third friction plate 55 and the brake plate 52 generate friction, forming a friction torque, which plays a buffering role and plays a certain compensation role for the third friction plate 55 after wear occurs, ensuring that the third friction plate 55 can be used multiple times to extend its service life.

[0109] As shown in Figures 4 to 8 , in some embodiments of the present invention, the rope return assembly 60 includes a rope return spring 61. One end of the rope return spring 61 is secured to the housing assembly 10, and the other end of the rope return spring 61 is secured to the transmission shaft 11. The rope return spring 61 is composed of a leaf spring wound continuously in a spiral, forming two free ends, designated as a first free end and a second free end. The first free end is secured in a slot in the housing assembly 10, and the second free end is secured in a slot in the transmission shaft 11.

[0110] Among them, the first free end can be directly connected to the shell assembly 10 or connected through an intermediate component. For example, the rope return assembly 60 includes an adjusting ring 62 and a rope return spring 61. The adjusting ring 62 can be fixedly connected to the shell assembly 10 by bolts or connecting columns. The adjusting ring 62 is an annular structure. The adjusting ring 62 is constructed to accommodate the rope return spring 61. A slot is provided on the inner side wall of the adjusting ring 62. The first free end of the rope return spring 61 is accommodated in the slot. As the rope return spring 61 recovers from deformation, the first free end will not detach from the slot.

[0111] In the embodiment provided by the present invention, the return rope spring 61 can provide elastic restoring force to the pulley assembly 30 when both ends are fixed, so that the rope 32 pulled out by the pulley assembly 30 can be automatically wound around the pulley body 31. The initial restoring force of the return rope spring 61 can be set by rotating the adjustment ring 62. After setting, the adjustment ring 62 is then fixed to the housing assembly 10.

[0112] When the rope return spring 61 rotates with the transmission shaft 11, it gradually increases its elastic restoring force, so that the rope 32 can be automatically fed back into the housing assembly 10. Specifically, the rope return spring 61 transmits the elastic restoring force to the wheel body 31 through the transmission shaft 11. Under the action of the elastic restoring force, the wheel body 31 rotates to wind the rope 32 around it.

[0113] As shown in Figures 1 to 8, in some embodiments of the present invention, the shell assembly 10 includes a shell body 12, a first cover body 13 and a second cover body 14; the shell body 12 has a first accommodating cavity 121 and a second accommodating cavity 122 arranged at intervals, the first cover body 13 is detachably connected to the shell body 12, and is used to close the first accommodating cavity 121, and the second cover body 14 is detachably connected to the shell body 12, and is used to close the second accommodating cavity 122; the pulley assembly 30 and the rescue mechanism 40 are arranged in the first accommodating cavity 121; the rope return assembly 60 and the locking assembly 50 are arranged in the second accommodating cavity 122.

[0114] The housing body 12 may be a cylindrical structure having two end surfaces at both ends of the housing body 12. A first accommodating cavity 121 is defined inwardly from one end surface of the housing body 12, and a second accommodating cavity 122 is defined inwardly from the other end surface of the housing body 12. In other words, the first accommodating cavity 121 and the second accommodating cavity 122 are separated to form two independent cavities.

[0115] The first cover 13 is connected to the end face of one end of the shell body 12 so that the inner wall of the first cover 13 (the side wall close to the first accommodating cavity 121 is called the inner wall) and the first accommodating cavity 121 together form a cavity, that is, the first cover 13 is used to close the first accommodating cavity 121.

[0116] The second cover 14 is connected to the end face of the other end of the shell body 12 so that the inner wall of the second cover 14 (the side wall close to the second accommodating cavity 122 is called the inner wall) and the second accommodating cavity 122 are jointly enclosed to form a cavity, that is, the second cover 14 is used to close the second accommodating cavity 122.

[0117] By placing the sheave assembly 30 and the rescue mechanism 40 in one cavity, and placing the return rope assembly 60 and the locking assembly 50 in one cavity, it is convenient to disassemble and repair each component. In addition, the sheave assembly 30, the return rope assembly 60, and the locking assembly 50 can also be placed in different cavities.

[0118] The fall protection device provided in an embodiment of the present invention is applied to a lifting device as an example. When in use, the upper lifting ring 15 of the fall protection device is fixedly connected to the anchor point, and the lower hook of the fall protection device is hung on the safety belt of the climber to prevent the climber from accidentally falling during the climbing process.

[0119] Under normal use, the fall protection device is used to prevent workers from falling from a height. At this time, the second transmission assembly 41 is in a non-rescue state, and the spring plunger is stuck in the first limiting groove 4411.

[0120] When a worker falls accidentally and needs to switch the second transmission assembly 41 to the rescue state, the spring plunger is pulled out and the rescue shaft 42 is pushed into the interior of the housing assembly 10. Then, the spring plunger is released so that it is locked in the second limiting groove 4412. At this time, the second transmission gear 411 and the first transmission gear 21 are engaged. When the handle 451 is turned clockwise, the rescue shaft 42 rotates accordingly, squeezing the ratchet body 431 and the second friction plates 433 on both sides of the ratchet body 431 until the friction force generated between the second transmission gear 411 and the ratchet body 431 and the second friction plates 433 on both sides of the ratchet body 431 is sufficient to drive the first transmission gear 21 to rotate through the second transmission gear 411, thereby lifting the worker who has fallen accidentally. At this time, if the handle 451 is released, under the action of gravity of the worker who accidentally falls, the first transmission gear 21 tends to drive the second transmission gear 411 to rotate. Because the ratchet body 431 and the second friction plates 433 on both sides of the ratchet body 431 are pressed tightly, and the ratchet body 431 is blocked by the check piece 4321 (thrust pin), the first transmission gear 21 cannot rotate, that is, the worker who accidentally falls will not continue to fall, and the anti-fall function during the rescue process can be realized.

[0121] When the handle 451 is rotated counterclockwise, the preload between the ratchet body 431 and the second friction plates 433 on either side of the ratchet body 431 disappears. The ratchet body 431 remains stopped by the stopper 4321 (thrust pin) and remains stationary. Under the weight of the worker who has fallen, the first transmission gear 21 drives the second transmission gear 411, the gear sleeve 412, and the rescue shaft 42 to rotate simultaneously, thereby lowering the worker. When the handle 451 stops rotating counterclockwise, since the ratchet body 431 remains stationary during this process, the rescue shaft 42 rotates under the weight of the fallen person and continues to compress the ratchet body 431 and the second friction plates 433 on either side of the ratchet body 431. Once the second friction plates 433 are compressed, the gear sleeve 412 stops rotating due to the friction of the second friction plates 433, thereby keeping the worker stationary. Continuing to rotate the handle 451 counterclockwise repeats the above process, lowering the worker.

[0122] The fall protection device provided by the present invention utilizes a rescue mechanism 40 disposed within the housing assembly 10 of the fall protection body 100. The second transmission assembly 41 of the rescue mechanism 40 can be switched between a rescue and non-rescue state. When in the rescue state, the second transmission assembly 41 cooperates with the first transmission assembly 20, driving the rescue shaft 42 to move the transmission shaft 11, thereby causing the sheave assembly 30 to synchronously move, thereby reeling in and releasing the rope, thereby lifting a fallen worker to a platform or lowering the fallen worker to the platform for rescue. This rescue process eliminates the need to connect the rescue rope 32 to the worker's safety belt, simplifying the rescue operation and reducing time. The rescue operation is not limited by the space in the work area or the worker's condition. When in the non-rescue state, the second transmission assembly 41 is separated from the first transmission assembly 20, effectively maintaining the fall protection device's original function. The addition of the rescue mechanism 40 does not affect the original function of the fall protection device.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fall protection device, characterized in that: include: The anti-fall body (100) comprises a housing assembly (10), and a transmission shaft (11), a rope wheel assembly (30) and a first transmission assembly (20) arranged in the housing assembly (10), wherein the rope wheel assembly (30) and the first transmission assembly (20) are respectively connected to the transmission shaft (11) in a transmission manner; A rescue mechanism (40) is arranged on the housing assembly (10), and the rescue mechanism (40) comprises a second transmission assembly (41) and a rescue shaft (42). The second transmission assembly (41) is suitable for switching between a rescue state and a non-rescue state. In the rescue state, the second transmission assembly (41) cooperates with the first transmission assembly (20) in transmission, and drives the rescue shaft (42) to move so as to drive the transmission shaft (11) to move, thereby causing the rope pulley assembly (30) to move synchronously. In the non-rescue state, the second transmission assembly (41) is separated from the first transmission assembly (20).

2. The fall protection device according to claim 1, characterized in that: The rescue mechanism (40) further comprises a ratchet assembly (43) and a limit assembly (44); The rescue shaft (42) is provided with threaded sections (421) and limiting sections (422) at intervals along its axial direction, and the second transmission assembly (41) is threadedly connected to the threaded section (421); the ratchet assembly (43) is provided between the threaded section (421) and the limiting section (422), and the ratchet assembly (43) and the rescue shaft (42) can rotate relative to each other; The limiting assembly (44) is arranged on a side of the limiting section (422) away from the ratchet assembly (43) so as to keep the second transmission assembly (41) in the rescue state or the non-rescue state.

3. The fall protection device according to claim 2, characterized in that: The limiting component (44) comprises: A limiting sleeve (441) is sleeved on the rescue shaft (42), and the outer circumferential surface of the limiting sleeve (441) is provided with a first limiting groove (4411) and a second limiting groove (4412), and the first limiting groove (4411) and the second limiting groove (4412) are arranged at intervals along the axial direction of the limiting sleeve (441); A limiting member (442) is movably disposed on the housing assembly (10) and cooperates with the first limiting groove (4411) or the second limiting groove (4412) to limit the position, so that the second transmission assembly (41) remains in the rescue state or the non-rescue state.

4. The fall protection device according to claim 2, characterized in that: The ratchet assembly (43) comprises a ratchet body (431) and a non-return component (432); The ratchet body (431) and the rescue shaft (42) are relatively rotatable; The non-return component (432) is provided on the housing assembly (10), and the non-return component (432) is located between two adjacent ratchet teeth of the ratchet body (431).

5. The fall protection device according to claim 4, characterized in that: The non-return component (432) includes a non-return component (4321), an elastic component (4322) and a fastener (4323); The non-return member (4321) abuts against the ratchet body (431), the elastic member (4322) is respectively connected to the non-return member (4321) and the fastener (4323), and the fastener (4323) is fixedly connected to the housing assembly (10).

6. The fall protection device according to claim 4, characterized in that: A second friction plate (433) is provided on at least one side of the ratchet body (431), and the second friction plate (433) and the rescue shaft (42) are rotatably arranged.

7. The fall protection device according to claim 2, characterized in that: The second transmission assembly (41) comprises a second transmission gear (411), and the second transmission gear (411) is threadedly engaged with the threaded section (421).

8. The fall protection device according to claim 7, characterized in that: The second transmission assembly (41) further comprises a gear sleeve (412), the gear sleeve (412) being threadably matched with the threaded section (421), and the second transmission gear (411) being sleeved on the gear sleeve (412).

9. The fall protection device according to claim 8, characterized in that: The gear sleeve (412) comprises a sleeve body (4121) and a limiting portion (4122), wherein the limiting portion (4122) is arranged to protrude from the outer circumferential surface of the sleeve body (4121); The second transmission gear (411) is sleeved on the sleeve body (4121) and fixedly connected to the limiting portion (4122).

10. The fall protection device according to claim 2, characterized in that: The rescue shaft (42) has a first end and a second end that are arranged opposite to each other; The first end of the rescue shaft (42) is inserted into the housing assembly (10) and extends out of the housing assembly (10), and the first end is provided with a driving component (45) for driving the rescue shaft (42) to move; The second end of the rescue shaft (42) is guided and matched with the housing assembly (10).

11. The fall protection device according to claim 1, characterized in that: The first transmission assembly (20) comprises a first transmission gear (21) and a first friction plate (22), wherein the first friction plate (22) is pressed tightly against two sides of the first transmission gear (21); The first friction plate (22) is in transmission cooperation with the transmission shaft (11), and the first transmission gear (21) and the transmission shaft (11) can rotate relative to each other.

12. A fall protection device according to any one of claims 1 to 11, characterized in that: The anti-fall body (100) further comprises a locking assembly (50) and a rope return assembly (60) which are transmission-connected to the transmission shaft (11); the locking assembly (50) is used for locking the fall protection device when it falls, and the rope return assembly (60) is used for collecting the rope of the rope wheel assembly (30).

13. The fall protection device according to claim 12, characterized in that The locking assembly (50) comprises a tooth body (51), a brake plate (52), a swing lock block (53) and an elastic element (54); The tooth body (51) is fixed to the housing assembly (10), the brake plate (52) is transmission-connected to the transmission shaft (11), the swing lock block (53) is rotationally connected to the brake plate (52), and the elastic element (54) is respectively connected to the brake plate (52) and the swing lock block (53).

14. The fall protection device according to claim 13, characterized in that A third friction plate (55) is arranged on both sides of the brake plate (52), and the third friction plate (55) is in transmission cooperation with the transmission shaft (11), and the brake plate (52) and the transmission shaft (11) can rotate relative to each other.

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