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

Abstract

The invention discloses a personnel safety sling self-control folding and unfolding anti-falling device, and relates to the technical field of safety protection, the personnel safety sling self-control folding and unfolding anti-falling device 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 plate through a rotating shaft, the sling is arranged in the middle of the sling wheel carrier plate, and a volute spiral spring assembly is arranged on one side of the sling wheel carrier plate; a non-return mechanism is arranged on the other side of the lifting belt and 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 a device body and pulling a 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] The invention relates to the technical field of safety protection, and in particular to a self-controlled retracting and releasing anti-falling device for a personnel safety harness. Background Art

[0002] When the workboat is being lowered from the ship to the sea surface by a crane, it is often disturbed by wind and waves in high sea conditions, causing the mother ship and the workboat to be in a relative swaying state, which puts the personnel in the boat at risk of safety. There have been accidents where the mechanical parts of the crane were damaged and caused injuries. The current measure taken for personnel safety is to tie a civilian safety belt to the boat. Since it is a passive safety measure, it cannot fully guarantee the safety performance requirements of the personnel. In most cases, there is no safety protection measure to prevent falling, which can only reduce the sea conditions required for the use of the workboat.

[0003] The Chinese patent publication number CN110548236A discloses a buffer-type speed differential anti-fall device, in which a locking structure including a pawl and a ratchet is arranged in the space between the frame and the drum disc, a ratchet guide device is fixed on the frame, and an internal buffer damping device is arranged between the frame and the ratchet to apply resistance to the rotating ratchet so that the rotation is gradually stopped. The device adopts a centrifugal double internal locking mechanism, which reduces the impact force on the human body at the moment of falling and locking through the internal buffer damping device and the external buffer tension spring, ensuring that the anti-fall device can effectively reduce the impact damage to the human body under the premise of reliable locking. However, for ship work boats, when the work boat is lowered to the sea surface and leaves, the sling on the conventional speed differential anti-fall device will automatically retract to a high place, and when the work boat returns, the safety belt of the people on the boat can no longer be connected to the anti-fall device, resulting in a safety hazard that the people on the boat have no safety protection when lifting the boat. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a personnel safety harness automatic retraction and anti-falling device, which can meet the automatic one-way release, automatic retraction and safety anti-falling functions of the harness under any working environment conditions.

[0005] In order to achieve the above-mentioned technical objectives and meet the above-mentioned technical requirements, the technical solution adopted by the present invention is: a self-controlled retractable and anti-falling device for a personnel safety harness, comprising a shell, the upper end of the shell is connected to a hook via an axis, a harness pulley frame is connected to the shell via a rotating shaft, a harness is arranged in the middle of the harness pulley frame, a volute spring assembly is arranged on one side, and a non-return mechanism is arranged on the other side, the non-return mechanism comprises a stop-fall assembly, a non-return assembly is arranged on the shell on one side of the stop-fall assembly, and the self-controlled one-way release, self-controlled retraction and safety anti-falling functions of the harness are realized through the stop-fall assembly and the non-return assembly.

[0006] Preferably: the anti-fall assembly includes an anti-fall ratchet disk and a non-return ratchet disk, and several anti-fall shaft pins pass through the fixed plate and the shell to be connected with the anti-fall ratchet disk. The non-return ratchet disk is connected with an anti-fall pawl through a pawl shaft, and a pawl tension spring is arranged between the two opposite anti-fall pawls. The anti-fall pawl is used to realize safety anti-fall and single-double reversing function switching.

[0007] Preferably, the hole on the anti-drop ratchet disc connected to the anti-drop shaft pin is set as a waist-shaped hole, a long waist hole is set inside the waist-shaped hole, and a reset spring is set in the long waist hole.

[0008] Preferably, the non-return assembly comprises a non-return ratchet and a non-return pawl arranged on one side of the non-return ratchet, and a front end of the non-return pawl is in contact with the non-return ratchet disc.

[0009] Preferably, the non-return pawl comprises a rocker and a stop rod arranged at the front end of the rocker, an arc-shaped protrusion is arranged in the middle of the rocker, a groove corresponding to the non-return pawl is arranged on the shell, and the non-return pawl swings in the groove with the arc-shaped protrusion as the center.

[0010] Preferably: the non-return ratchet includes a ratchet body, a plurality of top beads are evenly distributed around the ratchet body, a small ratchet is arranged on one side of the ratchet body, and a tooth groove corresponding to the ratchet teeth of the small ratchet is arranged on the non-return ratchet disk to promote the rotation of the non-return ratchet and realize the contact and separation of the non-return pawl and the non-return ratchet disk.

[0011] Preferably, the scroll spring assembly comprises a scroll spring disk connected to a sling pulley frame disk, and a scroll spring is arranged in the scroll spring disk.

[0012] Working principle: When the sling is normally retracted or released, the non-return ratchet disc rotates with the sling wheel frame disc, and the non-return pawl can prevent the non-return ratchet disc from rotating in the opposite direction, and the sling is released in one direction; When the personnel pulls the sling hard to reach the locking torque, the anti-drop pawl expands outward under the action of centrifugal force and drives the anti-drop ratchet disc to rotate. The anti-drop ratchet disc pushes the non-return ratchet to rotate and lift the non-return pawl. The front end of the non-return pawl separates from the non-return ratchet disc. The non-return ratchet disc rotates in the opposite direction with the sling pulley under the action of the volute spring, and the sling is retracted at the same time. When the person pulls the sling hard again to reach the locking torque, the anti-drop pawl expands outward under the action of centrifugal force and drives the anti-drop ratchet disc to rotate. The anti-drop ratchet disc pushes the non-return ratchet to rotate and press the non-return pawl. The non-return ratchet disc returns to the normal state, and the sling can only be released in one direction; When a person falls suddenly, the anti-fall pawl expands outward under the action of centrifugal force and drives the anti-fall ratchet disc to rotate a certain angle, and is then blocked by the anti-fall shaft pin. The anti-fall ratchet disc is rigidly connected to the sling pulley frame disc, and the sling is stuck to ensure the safety of the personnel.

[0013] Compared with the traditional structure, the invention has the following beneficial effects: compact structure, pure mechanical design, no need for separate equipment to realize the switching function, improved reliability of operation, guaranteed personnel safety, and through the setting of the non-return assembly, without operating the device body, the sling can be pulled to switch freely between the two states of one-way release anti-falling and two-way retracting anti-falling and stopping, meeting the use requirements in different scenarios. The device is suitable for ship work boats, aerial operations and other occasions where large-scale mobile personnel need to be safely protected from falling, ensuring the safety of users and having broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the present invention; Figure 2 for Figure 1 Medium AA view; Figure 3 for Figure 2 Middle BB view; Figure 4 for Figure 3 The enlarged image at point I in the middle; In the figure: 1. sling, 2. volute spring assembly, 21. volute spring disk, 22. volute spring, 3. non-return mechanism, 31. non-return ratchet disk, 32. non-drop ratchet disk, 321. tooth groove, 33. non-drop shaft pin, 34. reset spring, 35. fixed plate, 36. non-drop pawl, 37. non-return pawl, 371. stop rod, 372. rocker, 38. non-return ratchet, 381. ratchet body, 382. small ratchet, 383. top ball, 4. sling pulley frame disk, 5. rotating shaft, 6. hook, 7. shell, 71. groove. DETAILED DESCRIPTION

[0015] The present invention will be further described below.

[0016] Refer to the attached Figure 1-4 A personnel safety sling automatic retraction and anti-falling device comprises a shell 7, the upper end of the shell 7 is connected to a hook 6 through an axis, a sling pulley frame plate 4 is connected to the shell 7 through a rotating shaft 5, a sling 1 is arranged in the middle of the sling pulley frame plate 4, a volute spring assembly 2 is arranged on one side, and a non-return mechanism 3 is arranged on the other side, the non-return mechanism 3 comprises a stop-fall assembly, and a non-return assembly is arranged on the shell 7 on one side of the stop-fall assembly, and the self-controlled one-way release, self-controlled retraction and safety anti-falling functions of the sling 1 are realized through the non-fall assembly and the non-return assembly.

[0017] In this preferred embodiment, the anti-fall assembly includes an anti-fall ratchet disk 32 and a non-return ratchet disk 31. Several anti-fall shaft pins 33 pass through the fixed plate 35 and the shell 7 and are connected to the anti-fall ratchet disk 32. The non-return ratchet disk 31 is connected with an anti-fall pawl 36 through a pawl shaft. A pawl tension spring 35 is arranged between the two opposite anti-fall pawls 36. The anti-fall pawl 36 is used to realize safety anti-fall and single-double reversing function switching.

[0018] In this preferred embodiment, the hole on the anti-drop ratchet disc 32 connected to the anti-drop shaft pin 33 is set as a waist-shaped hole, a long waist hole is set inside the waist-shaped hole, and a reset spring 34 is set in the long waist hole.

[0019] In this preferred embodiment, the non-return assembly includes a non-return ratchet 38 and a non-return pawl 37 disposed on one side of the non-return ratchet 38 , and a front end of the non-return pawl 37 is in contact with the non-return ratchet disc 31 .

[0020] In this preferred embodiment, the non-return pawl 37 includes a rocker 372 and a stop rod 371 arranged at the front end of the rocker 372. An arc-shaped protrusion is arranged in the middle of the rocker 372. A groove 71 corresponding to the non-return pawl 37 is arranged on the shell 7. The non-return pawl 37 swings in the groove 71 with the arc-shaped protrusion as the center.

[0021] In this preferred embodiment, the non-return ratchet 38 includes a ratchet body 381, and the ratchet body 381 is evenly distributed with a plurality of top beads 383. A small ratchet 382 is arranged on one side of the ratchet body 381. A tooth groove 321 corresponding to the ratchet teeth of the small ratchet 382 is arranged on the non-return ratchet plate 32 to promote the rotation of the non-return ratchet 38, thereby realizing the contact and separation of the non-return pawl 37 and the non-return ratchet plate 31.

[0022] In the preferred embodiment, the scroll spring assembly 2 includes a scroll spring disk 21 connected to the sling pulley frame disk 4 , and a scroll spring 22 is disposed in the scroll spring disk 21 .

[0023] Embodiment 1: When the ship's workboat is retracted from the ship to the sea surface, the sling automatic retracting and anti-falling device is suspended at a high place through the hook 6. In order to ensure the safety of personnel, the lower part of the sling 1 is hung on the personnel in the boat, and the sling 1 is gently pulled to determine whether the device is in a one-way release or two-way retracting state. If the device is in a two-way retracting state, the sling 1 is pulled hard to reach the locking torque and switched to a one-way release state. When the sling 1 is normally retracted, the non-return ratchet disc 31 rotates with the sling wheel frame disc, and the non-return pawl 37 contacts the non-return ratchet 38, which can prevent the non-return ratchet disc 32 from rotating in the opposite direction. The sling 1 is released in one direction. When the workboat and the personnel reach the predetermined position, the personnel on the boat unhook the safety belt hook, and the device sling 1 remains in place. At this time, the device sling 1 is in a one-way release state; When the workboat returns, the crew on board hooks the safety belt on the sling 1 of the self-controlled retractable anti-fall device, and then pulls the sling 1 hard to reach the locking torque. The anti-fall pawl 36 expands outward under the action of centrifugal force and drives the anti-fall ratchet disc 32 to rotate. The anti-fall ratchet disc 32 pushes the non-return ratchet 38 to rotate, and the top ball 383 lifts the non-return pawl 37. The front end of the non-return pawl 37 is separated from the non-return ratchet disc 31. The non-return ratchet disc 31 rotates freely in the opposite direction under the action of the volute spring 22, and the sling 1 is retracted at the same time. At this time, the sling 1 of the device is in a two-way retractable state; Regardless of whether the sling 1 of the device is in a unidirectional or bidirectional state, when a person suddenly falls, the anti-fall pawl 36 expands outward under the action of centrifugal force and drives the anti-fall ratchet disk 32 to rotate a certain angle, and is then blocked by the anti-fall shaft pin 33. The anti-fall ratchet disk 32 is rigidly connected to the sling wheel frame disk 4 through the anti-fall pawl 36 and the pawl shaft, and the sling 1 is stuck to ensure the safety of the personnel. At this time, the sling 1 of the device is in an anti-fall and anti-fall state.

[0024] Embodiment 2: In infrastructure construction, aerial work is often required. During aerial work, workers stand on a lifting platform. If the lifting platform fails, there will be a risk of falling. One end of the sling automatic retractable anti-falling device is tied to the high-altitude fixed truss, and the other end is hung on the worker, so that the sling moves with the personnel working platform, which can protect the personal safety of the workers. The working principle of this embodiment is basically the same as that of embodiment 1.

[0025] This device adopts a purely mechanical design and does not require separate equipment to realize the switching function, which improves the reliability of operation and ensures the safety of personnel. It can realize the self-controlled one-way release, self-controlled retraction and safety anti-falling functions of the sling. It is suitable for ship work boats, high-altitude operations and other occasions where personnel need to be safely protected from falling, ensuring the safety of users and has broad application prospects.

[0026] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A personnel safety harness automatic retractable anti-falling device, comprising a housing (7), characterized in that: The upper end of the shell (7) is connected to a hook (6) via a shaft, and a sling pulley frame plate (4) is connected to the shell (7) via a rotating shaft (5). A sling (1) is arranged in the middle of the sling pulley frame plate (4), one side of which is provided with a volute spring assembly (2), and the other side of which is provided with a non-return mechanism (3). The non-return mechanism (3) comprises a stop-fall assembly, and a non-return assembly is arranged on the shell (7) on one side of the stop-fall assembly. The stop-fall assembly and the non-return assembly realize the self-controlled one-way release, self-controlled retraction and safety anti-fall functions of the sling (1).

2. The personnel safety harness automatic retracting and anti-falling device according to claim 1 is characterized in that: The anti-fall assembly comprises an anti-fall ratchet disc (32) and a non-return ratchet disc (31); a plurality of anti-fall shaft pins (33) pass through a fixing plate (35) and a housing (7) and are connected to the anti-fall ratchet disc (32); an anti-fall pawl (36) is connected to the non-return ratchet disc (31) via a pawl shaft; a pawl tension spring (35) is provided between two opposing anti-fall pawls (36); and the anti-fall pawl (36) is used to realize safety anti-fall and single-double reversing function switching.

3. The personnel safety harness automatic retracting and anti-falling device according to claim 2 is characterized in that: The hole on the anti-drop ratchet disc (32) connected to the anti-drop shaft pin (33) is configured as a waist-shaped hole, a long waist hole is configured inside the waist-shaped hole, and a reset spring (34) is configured inside the long waist hole.

4. The personnel safety harness automatic retracting and anti-falling device according to claim 1 is characterized in that: The non-return assembly comprises a non-return ratchet (38) and a non-return pawl (37) arranged on one side of the non-return ratchet (38), wherein the front end of the non-return pawl (37) contacts the non-return ratchet disc (31).

5. The personnel safety harness automatic retracting and anti-falling device according to claim 4 is characterized in that: The non-return pawl (37) comprises a rocker (372) and a stop rod (371) arranged at the front end of the rocker (372); an arc-shaped protrusion is arranged in the middle of the rocker (372); a groove (71) corresponding to the non-return pawl (37) is arranged on the housing (7); and the non-return pawl (37) swings in the groove (71) with the arc-shaped protrusion as the center.

6. The personnel safety harness automatic retracting and anti-falling device according to claim 4 is characterized in that: The non-return ratchet (38) comprises a ratchet body (381), the ratchet body (381) being evenly provided with a plurality of top beads (383) in the circumferential direction, a small ratchet (382) being provided on one side of the ratchet body (381), and a tooth groove (321) corresponding to the ratchet teeth of the small ratchet (382) being provided on the non-return ratchet disc (32) so as to push the non-return ratchet (38) to rotate, thereby achieving contact and separation between the non-return pawl (37) and the non-return ratchet disc (31).

7. The personnel safety harness automatic retracting and anti-falling device according to claim 1 is characterized in that: The scroll spring assembly (2) comprises a scroll spring disk (21) connected to a sling pulley frame disk (4), wherein a scroll spring (22) is arranged in the scroll spring disk (21).

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