Self-control folding and unfolding anti-falling device of personnel safety sling

Abstract

The utility model discloses a personnel safety sling self-control folding and unfolding anti-falling device which comprises a shell, the upper end of the shell is connected with a lifting hook through a shaft, the shell is internally connected with a sling wheel carrier disc through a rotating shaft, a sling is arranged in the middle of the sling wheel carrier disc, a volute spiral spring assembly is arranged on one side of the sling wheel carrier disc, and a non-return mechanism is arranged on the other side of the sling wheel carrier disc. The non-return mechanism comprises a descending stopping assembly, a non-return assembly is arranged on the portion, on one side of the descending stopping assembly, of the shell, and the functions of self-control one-way releasing, self-control retracting and safe falling prevention of the lifting belt are achieved through the descending stopping assembly and the non-return assembly. Pure mechanical design is adopted, free switching between a one-way release anti-falling and falling-stopping state and a two-way retraction anti-falling and falling-stopping state can be achieved without operating the device body and pulling the hanging belt, the use requirements in different scenes are met, the operation reliability is improved, and the safety is improved. The safety anti-falling protection device is suitable for occasions needing safety anti-falling protection on personnel such as ship working boats and high-altitude operation, and the safety of the personnel is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of safety protection technology, and in particular to a self-controlled retraction and anti-fall device for personnel safety harnesses. Background Technology

[0002] When a crane is lowered or lowered from a ship to the sea surface, the workboat often faces interference from high sea states and rough seas, causing the mother ship and the workboat to be in a relative rolling state. This puts the personnel on board at risk, and there have been cases of injuries caused by damage to crane mechanical parts. Currently, the safety measures taken for personnel are to attach civilian safety belts to the workboat. However, because these are passive safety measures, they cannot fully guarantee the safety of personnel. In many cases, there are no safety fall protection measures at all, and the only option is to reduce the sea state requirements for the workboat's operation.

[0003] Chinese patent publication CN110548236A discloses a buffer-type speed-differential fall arrest device. It features a locking structure including a pawl and ratchet within the space between the frame and the drum disc. A ratchet guide device is fixed to the frame, and an internal buffer damping device is positioned between the frame and the ratchet to apply resistance to the rotating ratchet, gradually bringing it to a stop. This device employs a centrifugal double internal locking mechanism, using the internal buffer damping device and external buffer spring to reduce the impact force on the human body at the moment of locking, ensuring that the fall arrest device effectively reduces injury to the human body while reliably locking. However, for workboats used on ships, when the workboat is lowered to the sea surface and leaves, the slings on conventional speed-differential fall arrest devices automatically retract to a higher position. When the workboat returns, the safety belts of the personnel on board can no longer be connected to the fall arrest device, creating a safety hazard of no fall protection for the personnel on board when hoisting the workboat. Summary of the Invention

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide a self-controlled release and anti-fall device for personnel safety slings, which can meet the functions of self-controlled one-way release, self-controlled retraction and safety anti-fall under any working environment.

[0005] To achieve the above technical objectives and requirements, the technical solution adopted by this utility model is as follows: a personnel safety harness self-controlled release and retraction anti-fall device, comprising a housing, a hook connected to the upper end of the housing via a shaft, a harness wheel frame connected inside the housing via a rotating shaft, a harness disposed in the middle of the harness wheel frame, a spiral spring assembly disposed on one side, and a check mechanism disposed on the other side, the check mechanism comprising a drop-stop component, the drop-stop component being disposed on the housing on one side of the drop-stop component, the drop-stop component and the check mechanism realizing the self-controlled one-way release, self-controlled retraction and safety anti-fall functions of the harness; the check component comprising a check ratchet and a check pawl disposed on one side of the check ratchet, the front end of the check pawl contacting the check ratchet disc, the check ratchet comprising a ratchet body, a plurality of top balls evenly distributed around the circumference of the ratchet body, and a small ratchet disposed on one side of the ratchet body.

[0006] Preferably, the anti-fall assembly includes an anti-fall ratchet disc and a backtracking ratchet disc. Several anti-falling pins pass through the fixing plate and the housing and are connected to the anti-fall ratchet disc. The backtracking ratchet disc is connected to an anti-falling pawl via a pawl shaft. A pawl tension spring is provided between two opposite anti-falling pawls. The anti-falling pawls enable safety anti-fall and single / double reversing function switching.

[0007] Preferably, the hole on the stop ratchet disc that connects to the stop pin is a waist-shaped hole, and an elongated hole is provided inside the waist-shaped hole, and a return spring is provided inside the elongated hole.

[0008] Preferably, the anti-return pawl includes a rocker arm and a stop rod disposed at the front end of the rocker arm. The rocker arm has an arc-shaped protrusion in the middle and a groove corresponding to the anti-return pawl is disposed on the housing. The anti-return pawl swings in the groove with the arc-shaped protrusion as the center.

[0009] Preferably, the anti-return ratchet disc is provided with tooth grooves corresponding to the ratchet teeth of the small ratchet, so as to drive the anti-return ratchet to rotate and realize the contact and separation of the anti-return pawl and the anti-return ratchet disc.

[0010] Preferably, the spiral spring assembly includes a spiral spring disc connected to the sling wheel frame disc, and a spiral spring is disposed inside the spiral spring disc.

[0011] Working principle: When the sling is being retracted or extended normally, the check ratchet disc rotates with the sling pulley frame disc, and the check pawl can prevent the check ratchet disc from rotating in the opposite direction, so the sling is released in one direction;

[0012] When the personnel pull the sling to the locking torque, the pawl expands outward under the action of centrifugal force and drives the pawl to rotate. The pawl pushes the ratchet to rotate and lifts the pawl. The front end of the pawl separates from the ratchet. The ratchet rotates in the opposite direction with the sling wheel frame under the action of the spiral spring, and the sling is retracted at the same time.

[0013] When the personnel pull the sling again to reach the locking torque, the pawl expands outward under the action of centrifugal force and drives the pawl to rotate. The pawl pushes the check ratchet to rotate and presses down the check pawl. The check ratchet returns to its normal state, and the sling can only be released in one direction.

[0014] When personnel suddenly fall, the pawl expands outward under centrifugal force and drives the pawl disc to rotate at a certain angle. Then, it is stopped by the pawl pin. The pawl disc is rigidly connected to the sling wheel frame disc, and the sling is locked, ensuring personnel safety.

[0015] Compared with traditional structures, this utility model offers the following advantages: It features a compact structure, employs a purely mechanical design, and eliminates the need for separate equipment to achieve the switching function, thus improving operational reliability and ensuring personnel safety. Through the inclusion of a check valve component, the device can freely switch between unidirectional release and bidirectional retraction / extension of the fall arrestor without requiring operation of the main unit itself, meeting the usage requirements of various scenarios. This device is suitable for applications such as workboats on ships and high-altitude operations requiring fall protection for personnel moving over large areas, ensuring user safety and possessing broad application prospects. Attached Figure Description

[0016] Figure 1 This is the front view of the present utility model;

[0017] Figure 2 for Figure 1 AA view;

[0018] Figure 3 for Figure 2 BB view;

[0019] Figure 4 for Figure 3 Enlarged view at point I;

[0020] In the diagram: 1. Sling, 2. Scroll spring assembly, 21. Scroll spring disc, 22. Scroll spring, 3. Check mechanism, 31. Check ratchet disc, 32. Stop ratchet disc, 321. Tooth groove, 33. Stop pin, 34. Return spring, 35. Fixing plate, 36. Stop pawl, 37. Check pawl, 371. Stop rod, 372. Rocker arm, 38. Check ratchet, 381. Ratchet body, 382. Small ratchet, 383. Top ball, 39. Pawl tension spring, 4. Sling wheel frame disc, 5. Shaft, 6. Hook, 7. Housing, 71. Groove. Detailed Implementation

[0021] The present invention will be further described below.

[0022] See attached document Figure 1-4A self-controlled release and retraction anti-fall device for a personnel safety harness includes a housing 7. A hook 6 is connected to the upper end of the housing 7 via a shaft. A harness wheel frame 4 is connected to the housing 7 via a rotating shaft 5. A harness 1 is arranged in the middle of the harness wheel frame 4. A spiral spring assembly 2 is arranged on one side, and a check mechanism 3 is arranged on the other side. The check mechanism 3 includes a drop-stop component. The drop-stop component is arranged on the housing 7 on one side of the drop-stop component. The drop-stop component and the check mechanism realize the self-controlled one-way release, self-controlled retraction, and safety anti-fall functions of the harness 1. The check component includes a check ratchet 38 and a check pawl 37 arranged on one side of the check ratchet 38. The front end of the check pawl 37 contacts the check ratchet disc 31. The check ratchet 38 includes a ratchet body 381. A plurality of top beads 383 are evenly distributed around the ratchet body 381. A small ratchet 382 is arranged on one side of the ratchet body 381.

[0023] In this preferred embodiment, the anti-fall assembly includes an anti-fall ratchet disc 32 and a backtracking ratchet disc 31. Several anti-falling pins 33 pass through the fixing plate 35 and the housing 7 and are connected to the anti-fall ratchet disc 32. The backtracking ratchet disc 31 is connected to an anti-falling pawl 36 via a pawl shaft. A pawl tension spring 39 is provided between two opposite anti-falling pawls 36. The anti-falling pawls 36 enable safety anti-fall and single / double reversing function switching.

[0024] In this preferred embodiment, the hole on the anti-fall ratchet disc 32 that connects to the anti-fall pin 33 is configured as an oblong hole, and an elongated hole is provided inside the oblong hole, and a return spring 34 is provided inside the elongated hole.

[0025] In this preferred embodiment, the anti-return pawl 37 includes a rocker arm 372 and a stop rod 371 disposed at the front end of the rocker arm 372. The rocker arm 372 has an arc-shaped protrusion in the middle. The housing 7 has a groove 71 corresponding to the anti-return pawl 37. The anti-return pawl 37 swings in the groove 71 with the arc-shaped protrusion as the center.

[0026] In this preferred embodiment, the anti-fall ratchet disc 32 is provided with a tooth groove 321 corresponding to the ratchet teeth of the small ratchet 382, ​​so as to drive the anti-return ratchet 38 to rotate, thereby realizing the contact and separation of the anti-return pawl 37 and the anti-return ratchet disc 31.

[0027] In this preferred embodiment, the spiral spring assembly 2 includes a spiral spring disk 21 connected to the sling wheel frame disk 4, and a spiral spring 22 is disposed inside the spiral spring disk 21.

[0028] Example 1: When a workboat is launched from the ship to the sea surface, the self-controlled launch and anti-fall device of the sling is suspended at a high position through the hook 6. In order to ensure the safety of personnel, the lower part of the sling 1 is attached to the personnel inside the boat. The sling 1 is pulled lightly to determine whether the device is in a one-way release or two-way launch and retraction state. If the device is in a two-way launch and retraction state, the sling 1 is pulled hard to reach the locking torque, and it is switched to a one-way release state. When the sling 1 is launched and retracted normally, the anti-return ratchet disc 31 rotates with the sling wheel frame disc, and the anti-return pawl 37 contacts the anti-return ratchet 38, which can prevent the anti-return ratchet disc 32 from rotating in the opposite direction. The sling 1 is released in one direction. When the workboat and personnel reach the predetermined position, the personnel on the boat unhook their safety belts, and the sling 1 of the device remains in the original position. At this time, the sling 1 of the device is in a one-way release state.

[0029] When the workboat returns, the crew members hook their safety belts onto the self-controlled retractable anti-fall device harness 1, and then pull harness 1 to reach the locking torque. The descent pawl 36 expands outward under centrifugal force and drives the descent ratchet disc 32 to rotate. The descent ratchet disc 32 pushes the return ratchet 38 to rotate, and the top ball 383 lifts the return pawl 37. The front end of the return pawl 37 separates from the return ratchet disc 31. The return ratchet disc 31 rotates freely in the opposite direction under the action of the spiral spring 22. At the same time, harness 1 is retracted. At this time, harness 1 of the device is in a bidirectional retractable state.

[0030] Regardless of whether the sling 1 of the device is in a unidirectional or bidirectional state, when a person suddenly falls, the pawl 36 expands outward under the action of centrifugal force and drives the pawl disc 32 to rotate at a certain angle. Then, it is blocked by the pawl pin 33. The pawl disc 32 is rigidly connected to the sling wheel frame disc 4 through the pawl 36, the pawl shaft, and the sling 1. The sling 1 is locked to ensure the safety of the personnel. At this time, the sling 1 of the device is in the anti-fall and anti-drop state.

[0031] Example 2: In infrastructure construction, high-altitude operations are frequently required. Workers stand on lifting platforms during these operations; if the platform malfunctions, a fall hazard can occur. This self-controlled sling retraction and fall protection device is attached to a fixed truss at the high altitude at one end, and to the worker at the other end, allowing the sling to move with the work platform, thus protecting the worker's safety. The working principle of this example is basically the same as in Example 1.

[0032] This device adopts a purely mechanical design, eliminating the need for separate equipment to achieve the switching function, thus improving operational reliability and ensuring personnel safety. It can realize the self-controlled one-way release, self-controlled retraction, and safety fall prevention functions of the sling. It is suitable for occasions such as workboats on ships and high-altitude operations that require personnel safety fall prevention protection, ensuring user safety and having broad application prospects.

[0033] The above embodiments of this utility model are merely examples to clearly illustrate this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent technical solutions also fall within the scope of this utility model, and the patent protection scope of this utility model should be defined by each claim.

Claims

1. A self-controlled retraction and anti-fall device for personnel safety harnesses, comprising a housing (7), characterized in that: The upper end of the housing (7) is connected to a hook (6) via a shaft. Inside the housing (7) is a sling wheel frame (4) connected via a rotating shaft (5). A sling (1) is provided in the middle of the sling wheel frame (4). A spiral spring assembly (2) is provided on one side, and a check mechanism (3) is provided on the other side. The check mechanism (3) includes a bottom-stopping component. A check mechanism is provided on the housing (7) on one side of the bottom-stopping component. The bottom-stopping component and the check mechanism enable the sling (1) to be automatically controlled. The device includes a release mechanism, a self-controlled retraction mechanism, and a safety fall prevention mechanism. The anti-return assembly includes an anti-return ratchet (38) and an anti-return pawl (37) disposed on one side of the anti-return ratchet (38). The front end of the anti-return pawl (37) is in contact with the anti-return ratchet disc (31). The anti-return ratchet (38) includes a ratchet body (381). The ratchet body (381) is circumferentially distributed with a number of top beads (383). A small ratchet (382) is disposed on one side of the ratchet body (381).

2. The personnel safety harness self-controlled retraction and anti-fall device according to claim 1, characterized in that: The anti-fall assembly includes an anti-fall ratchet disc (32) and a backtracking ratchet disc (31). Several anti-falling pins (33) pass through the fixing plate (35) and the housing (7) and are connected to the anti-fall ratchet disc (32). The backtracking ratchet disc (31) is connected to an anti-falling pawl (36) via a pawl shaft. A pawl tension spring (39) is provided between two opposite anti-falling pawls (36).

3. The personnel safety harness self-controlled retraction and anti-fall device according to claim 2, characterized in that: The hole on the stop ratchet disc (32) that connects to the stop pin (33) is a waist-shaped hole, and an elongated waist hole is provided inside the waist-shaped hole, and a return spring (34) is provided inside the elongated waist hole.

4. The personnel safety harness self-controlled retraction and anti-fall device according to claim 1, characterized in that: The anti-return pawl (37) includes a rocker arm (372) and a stop rod (371) provided at the front end of the rocker arm (372). The rocker arm (372) has an arc-shaped protrusion in the middle and a groove (71) corresponding to the anti-return pawl (37) is provided on the housing (7).

5. The personnel safety harness self-controlled retraction and anti-fall device according to claim 2, characterized in that: The ratchet disc (32) is provided with a tooth groove (321) corresponding to the ratchet teeth of the small ratchet (382).

6. The personnel safety harness self-controlled retraction and anti-fall device according to claim 1, characterized in that: The spiral spring assembly (2) includes a spiral spring disc (21) connected to the sling wheel frame disc (4), and a spiral spring (22) is provided inside the spiral spring disc (21).

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