A rewinding machine top rail operation personnel anti-falling device

Abstract

This utility model relates to the field of safety protection equipment technology, and in particular to a fall prevention device for workers operating on the top track of a rewinding machine. It includes a front housing and a rear housing, which are designed to fit together to form a closed accommodating cavity. A rotating shaft is fixedly installed inside the cavity, and a sleeve is rotatably mounted on the middle of the shaft. A coil spring is wound around the shaft, with one end fixed to the shaft and the other end fixed to the sleeve. By employing a coil spring energy storage mechanism, combined with a highly efficient ratchet and pawl locking mechanism, the wire rope can be automatically released or retrieved during worker movement, enabling the wire rope to extend and retract accordingly. This significantly expands the range of motion, improves operational freedom and maintenance efficiency, and simultaneously provides rapid mechanical locking in the event of an accidental fall, effectively limiting the fall distance and preventing personnel from falling. The device offers high safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of safety protection equipment technology, and in particular to a fall prevention device for workers operating on the top track of a rewinding machine. Background Technology

[0002] In the paper industry, rewinders are key post-processing equipment, mainly used to cut wide-width base paper rolls into narrow-width rolls according to customer requirements and rewind them into high-quality finished paper rolls. In actual production and maintenance, rewinders are usually equipped with maintenance tracks extending along the top of the machine, allowing operators or maintenance personnel to perform inspections, cleaning, roll changing, and debugging at height. The height of such work areas from the ground is generally between 3 and 6 meters. To ensure the personal safety of the operators, effective fall protection measures must be taken when performing such operations.

[0003] Currently, common safety protection methods include the use of fall arresters and fixed-point safety ropes. However, traditional fall arresters cannot immediately lock after detecting a fall, which may result in a brief but potentially harmful free fall. Traditional fixed-point safety ropes can only move within a limited radius around the anchor point. When workers need to move longitudinally along the rewinding machine, they must frequently unhook and rehook the safety rope, which is not only cumbersome but also creates a brief period of unprotection during the switching process, posing a safety hazard.

[0004] Therefore, there is an urgent need to provide a fall protection device for workers operating on the top track of a rewinding machine that can achieve instantaneous locking and automatic winding and unwinding. Utility Model Content

[0005] In order to overcome the shortcomings of existing traditional fall arrestors that cannot lock immediately after a fall is detected, and the limitations of traditional fixed-point safety ropes that restrict the range of movement and flexibility of workers and affect work efficiency, this utility model provides a fall arrest device for workers operating on the top track of a rewinding machine that can achieve instantaneous locking and automatic retraction.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: a fall prevention device for workers operating on the top track of a rewinding machine, comprising a front housing and a rear housing. The front housing and the rear housing are designed with a mating structure to form a closed accommodating cavity. A rotating shaft is fixedly installed inside the accommodating cavity. A sleeve is rotatably mounted on the middle of the rotating shaft. A coil spring is wound around the rotating shaft, with one end of the coil spring fixed to the rotating shaft and the other end fixed to the sleeve. A cover plate is provided at the rear end of the sleeve. A steel wire rope is wound around the outer circumference of the sleeve, with one end of the steel wire rope fixed to the sleeve and the other end passing through a through hole at the bottom of the housing. A ratchet is fixedly installed at the front end of the sleeve. An installation rod is fixedly installed inside the accommodating cavity. A pawl is rotatably mounted on the installation rod. A return spring is sleeved on the installation rod, with both ends of the return spring connected to the installation rod and the pawl, respectively.

[0007] Optionally, the pawl is a lever-type structure, with one end having a locking tooth that engages with the ratchet, and the other end maintaining slight contact with the ratchet under the action of a return spring without locking.

[0008] Optionally, a guide wheel is provided in the lower part of the accommodating cavity.

[0009] Optionally, the lower end of the wire rope is provided with two shock-absorbing rubber blocks, a buffer spring is sleeved on the wire rope, the two ends of the buffer spring respectively abut against the two shock-absorbing rubber blocks, and a lower hook is provided at the end of the wire rope.

[0010] Optionally, the top of the front housing and the rear housing are detachably provided with a first hanging ear, one end of a flame-retardant nylon rope is connected to the first hanging ear, and the other end of the flame-retardant nylon rope is connected to a second hanging ear, and an upper hook is detachably provided on the second hanging ear.

[0011] Optionally, both the first and second hooks are installed using a threaded connection.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. By adopting a coil spring energy storage mechanism, combined with a high-efficiency ratchet and pawl locking mechanism, the wire rope can be automatically released or retrieved during the movement of the operator, realizing the follow-up extension and retraction of the wire rope, significantly expanding the range of motion, improving the degree of freedom of operation and maintenance efficiency, and at the same time, it can achieve rapid mechanical locking in the event of an accidental fall, effectively limiting the fall distance, preventing personnel from falling, and ensuring high safety and reliability.

[0013] 2. The steel wire rope is equipped with a composite buffer structure consisting of a buffer spring and a shock-absorbing rubber block. During the retraction of the steel wire rope, the two work together to undergo elastic deformation, absorb the rebound kinetic energy, suppress impact vibration, avoid causing sudden pulling sensation to the workers, and significantly improve the user experience.

[0014] 3. By setting the first and second hanging ears, a detachable flame-retardant nylon rope connection structure is achieved, which facilitates regular inspection and replacement of vulnerable parts. Once the nylon rope is found to be worn or aged, the threaded connector can be quickly disassembled and replaced, ensuring that the entire device is in a safe and reliable working state for a long time and extending its service life. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural cross-sectional view of the ratchet, pawl, and return spring of this utility model.

[0017] Figure 3 This is an exploded view of the ratchet, shaft, and sleeve of this utility model.

[0018] Figure 4 This is a three-dimensional structural cross-sectional view of the first hook, the second hook, and the flame-retardant nylon rope of this utility model.

[0019] In the attached diagrams: 1: front housing, 2: rear housing, 3: pivot, 4: sleeve, 401: cover plate, 5: coil spring, 6: wire rope, 7: ratchet, 8: mounting rod, 9: pawl, 10: return spring, 11: guide wheel, 12: shock-absorbing rubber block, 13: buffer spring, 14: lower hook, 15: upper hook, 16: first hook, 17: second hook, 18: flame-retardant nylon rope. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: Please refer to Figures 1-3A fall protection device for workers operating on the top track of a rewinding machine includes a front housing 1 and a rear housing 2. The front housing 1 and the rear housing 2 are designed with a mating structure to form a closed accommodating cavity. A rotating shaft 3 is fixedly installed inside the accommodating cavity. A sleeve 4 is rotatably mounted in the middle of the rotating shaft 3. A coil spring 5 is wound around the rotating shaft 3. One end of the coil spring 5 is fixed to the rotating shaft 3, and the other end is fixed to the sleeve 4. When the sleeve 4 rotates relative to the rotating shaft 3, the coil spring 5 is coiled and undergoes torsional deformation, thereby storing elastic potential energy. A cover plate 401 for sealing and limiting is provided at the rear end of the sleeve 4. A steel wire rope 6 is wound around the outer periphery of the sleeve 4. One end of the steel wire rope 6 is fixed to the sleeve 4, and the other end extends from the bottom of the housing. The sleeve 4 has a through hole through it. A ratchet 7 is fixedly installed at the front end of the sleeve 4. An installation rod 8 is fixedly installed inside the accommodating cavity. A pawl 9 is rotatably installed on the installation rod 8. The pawl 9 has a lever structure. The right end has a locking tooth that engages with the ratchet 7. The left end is in slight contact with the ratchet 7 but is not locked. A return spring 10 is sleeved on the installation rod 8. The two ends of the return spring 10 are connected to the installation rod 8 and the pawl 9 respectively, providing support elasticity for the pawl 9 and ensuring that the right end of the pawl 9 can maintain slight contact with the ratchet 7 but is not locked. A guide wheel 11 is provided in the lower part of the accommodating cavity. The wire rope 6 passes around the guide wheel 11 before passing out, ensuring the stability of the wire rope 6 movement.

[0022] In normal use, when the operator moves, the wire rope 6 is slowly pulled out, and the sleeve 4 rotates accordingly. The coil spring 5 is gradually released and stored energy, while the ratchet 7 rotates slowly in sync with the sleeve 4. At this time, under the action of the return spring 10, the left end of the pawl 9 maintains slight contact with the ratchet 7 but is not locked, allowing the wire rope 6 to extend and retract freely, achieving smooth following motion. When the operator stops moving or retracts, the coil spring 5 drives the sleeve 4 to rotate in the opposite direction, automatically retracting the wire rope 6. When the operator accidentally falls, the wire rope 6 is pulled out rapidly, causing the sleeve 4 and ratchet 7 to rotate at high speed. When a certain speed is reached, the pawl 9 swings rapidly due to inertia, causing its right end to instantly engage in the tooth groove of the ratchet 7, achieving mechanical locking and preventing the wire rope 6 from being pulled out further, effectively preventing the operator from falling.

[0023] Example 2: Based on Example 1, please refer to... Figure 2 The lower end of the wire rope 6 is provided with two shock-absorbing rubber blocks 12, and a buffer spring 13 is sleeved on the wire rope 6. The two ends of the buffer spring 13 respectively abut against the two shock-absorbing rubber blocks 12. The buffer spring 13 and the shock-absorbing rubber blocks 12 are used to work together with the buffer spring 13 to absorb impact energy and suppress rebound vibration during the retraction of the wire rope 6. The end of the wire rope 6 is provided with a lower hook 14.

[0024] Please see Figure 4 The front housing 1 and the rear housing 2 are connected together by a first hanging ear 16 at their top. One end of a flame-retardant nylon rope 18 is connected to the first hanging ear 16, and the other end of the flame-retardant nylon rope 18 is connected to a second hanging ear 17. An upper hook 15 is threadedly connected to the second hanging ear 17. Both the first hanging ear 16 and the second hanging ear 17 are installed by threaded connection, which is convenient for disassembly and maintenance.

[0025] Before using this device, a safety inspection is required, with a focus on checking whether the flame-retardant nylon rope 18 is damaged, such as worn, broken strands, aging, or reduced strength. If the flame-retardant nylon rope 18 is found to be damaged, the first lug 16 and the second lug 17 can be unscrewed from the housing and the upper hook 15 in sequence, the old rope can be removed, and a new flame-retardant nylon rope 18 that meets the standard can be replaced. Then, the first lug 16 and the second lug 17 can be tightened to ensure a firm and reliable connection. During use, the entire device is suspended from a reliable fixed anchor point above the top track of the rewinding machine via the upper hook 15. The operator connects their safety belt to the lower hook 14. During the winding and unwinding of the wire rope 6, the buffer spring 13 is compressed and the shock-absorbing rubber block 12 deforms, which together absorb the rebound impact and improve the comfort of use.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A fall protection device for workers operating on the top track of a rewinding machine, comprising a front housing (1) and a rear housing (2), wherein the front housing (1) and the rear housing (2) are designed with a mating structure to form a closed accommodating cavity, characterized in that: A rotating shaft (3) is fixedly installed inside the accommodating cavity. A sleeve (4) is rotatably installed in the middle of the rotating shaft (3). A coil spring (5) is wound around the rotating shaft (3). One end of the coil spring (5) is fixed to the rotating shaft (3), and the other end is fixed to the sleeve (4). A cover plate (401) is provided at the rear end of the sleeve (4). A steel wire rope (6) is wound around the outer circumference of the sleeve (4). One end of the steel wire rope (6) is fixed to the sleeve (4), and the other end passes through the through hole at the bottom of the housing. A ratchet (7) is fixedly installed at the front end of the sleeve (4). An installation rod (8) is fixedly installed inside the accommodating cavity. A pawl (9) is rotatably installed on the installation rod (8). A return spring (10) is sleeved on the installation rod (8). The two ends of the return spring (10) are respectively connected to the installation rod (8) and the pawl (9).

2. The fall protection device for workers operating on the top track of a rewinding machine as described in claim 1, characterized in that: The pawl (9) is a lever structure. One end of it is provided with a tooth that meshes with the ratchet (7), and the other end can maintain slight contact with the ratchet (7) under the action of the return spring (10) but not lock.

3. The fall protection device for workers operating on the top track of a rewinding machine as described in claim 2, characterized in that: The lower part of the accommodating cavity is provided with guide wheels (11).

4. The fall protection device for workers operating on the top track of a rewinding machine as described in claim 3, characterized in that: Two shock-absorbing rubber blocks (12) are provided at the lower end of the wire rope (6), and a buffer spring (13) is sleeved on the wire rope (6). The two ends of the buffer spring (13) abut against the two shock-absorbing rubber blocks (12) respectively, and a lower hook (14) is provided at the end of the wire rope (6).

5. A fall protection device for workers operating on the top track of a rewinding machine as described in claim 4, characterized in that: The front housing (1) and the rear housing (2) are detachably provided with a first hanging ear (16) on their tops. One end of a flame-retardant nylon rope (18) is connected to the first hanging ear (16), and the other end of the flame-retardant nylon rope (18) is connected to a second hanging ear (17). The second hanging ear (17) is detachably provided with an upper hook (15).

6. The fall protection device for workers operating on the top track of a rewinding machine as described in claim 5, characterized in that: Both the first hanging ear (16) and the second hanging ear (17) are installed by threaded connection.

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