A cage anti-falling device with double triggering mechanism

Abstract

The utility model belongs to the technical field of hoisting equipment safety protection, especially relates to a cage anti-falling device with double trigger mechanism. Including cage body, guide rail, cage body is connected the guide rail through the pulley sliding, the top of cage body is fixed with the limit board, the top of cage body is hinged with the connecting arm and is installed at least one anti -falling subassembly, and the anti -falling subassembly includes: pivot, pivot both ends are rotatably connected on the cage body, brake wheel, is fixed in the pivot end, torsion spring, is connected in the end of pivot, its both ends are connected cage body and brake wheel respectively, drive arm, is fixed on the pivot, towrope, one end is fixed on the drive arm, the other end is fixed on the connecting arm, counterweight, is fixed on the brake wheel. The utility model integrates double brake trigger mechanism, is the backup for each other, has solved the reliability bottleneck of single spring drive thoroughly, has realized the real "double insurance".

Description

Technical Field

[0001] This utility model belongs to the field of safety protection technology for lifting equipment, and in particular relates to a cage anti-fall device with a dual triggering mechanism. Background Technology

[0002] In various fields such as construction, industrial installation, mining operations, and equipment maintenance, the vertical lifting of materials or personnel using hoist cages is a common and essential requirement. However, hoist cage operations are always accompanied by significant safety risks, one of the most serious being the breakage of the steel wire rope supporting the cage due to wear, overload, corrosion, or accidental impact. Once the wire rope breaks, the cage will fall uncontrollably under gravity, easily causing equipment damage, material loss, and even serious casualties. Therefore, providing a safety protection device that can quickly, automatically, and reliably stop the falling cage after the wire rope breaks is of paramount importance for ensuring operational safety and preventing accidents. Existing fall arrest devices suffer from problems such as complex structures and insufficient reliability due to reliance on a single triggering method. This utility model aims to provide an improved solution to the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a cage anti-fall device with a dual triggering mechanism to solve the problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A cage fall arrestor with a dual triggering mechanism includes a cage body and a guide rail. The cage body is slidably connected to the guide rail via pulleys. A limit plate is fixed to the top of the cage body. A connecting arm is hinged to the top of the cage body and at least one fall arrestor component is installed thereon. The fall arrestor component includes:

[0006] A rotating shaft, with both ends of which are rotatably connected to the cage body;

[0007] Brake wheel, fixed to the end of the shaft;

[0008] A torsion spring is fitted onto the end of the rotating shaft, with its two ends connected to the cage body and the brake wheel, respectively.

[0009] The drive arm is fixed on the rotating shaft;

[0010] The traction cable is fixed at one end to the drive arm and at the other end to the connecting arm;

[0011] The counterweight is fixed to the brake wheel.

[0012] Furthermore, the top of the connecting arm has a lifting hole for attaching a hook.

[0013] Furthermore, a limiting plate is located on one side of the connecting arm to prevent the connecting arm from rotating excessively.

[0014] Furthermore, the cage body is provided with an upwardly protruding protrusion, and the torsion spring is connected to the cage body through the protrusion.

[0015] Furthermore, the outer diameter of one end of the shaft is smaller than the outer diameter of the shaft body, and the torsion spring is located at the small diameter end of the shaft. The torsion spring is configured to be twisted and store energy when the traction cable is tensioned.

[0016] Furthermore, the counterweight is fixed to an extension plate that is inclinedly connected to the outer edge of the brake wheel, so that the center of gravity of the counterweight is offset from the center of the pivot, and is configured to be lifted to a high position when the traction cable is tensioned to store gravitational potential energy.

[0017] Furthermore, the brake wheel is an eccentric wheel, configured to be in a standby position away from the guide rail when the traction cable is tensioned, and to rotate to the braking position where it rubs against the guide rail when the traction cable is slack due to elastic force or gravity.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model integrates two completely independent driving mechanisms with different physical principles: torsion spring triggering and counterweight gravity triggering. The two serve as backups for each other. Even if the torsion spring fails due to long-term use, the gravity drive of the counterweight can still ensure the execution of the braking action, completely solving the reliability bottleneck of single spring drive and achieving true "double insurance".

[0020] 2. The core braking mechanism of this utility model consists of a small number of standard or simple machined parts such as a rotating shaft, brake wheel, drive arm, torsion spring and counterweight. The overall structure is compact and can be directly installed on the top of the existing cage without special modification to the guide rail. It has low manufacturing cost and is easy to install and maintain.

[0021] 3. An eccentric wheel is used as the brake wheel. The clamping force between the wheel and the guide rail and the friction force generated increase nonlinearly with the increase of the rotation angle. This can provide a gradual and predictable braking force for the falling cage, achieve smooth deceleration until it stops, and avoid secondary damage caused by violent impact.

[0022] 4. This device does not rely on a specific power source, is purely mechanically triggered, and is suitable for cages used with various electric hoists, winches, and other lifting equipment. It can be used as a main safety device or an auxiliary safety device.

[0023] 5. The limit plate prevents the connecting arm from rotating excessively when the electric hoist is pulled at an angle, thus avoiding the counterweight from accidentally touching the guide rail. Attached Figure Description

[0024] Figure 1This is a front view structural diagram of the present invention in the normal lifting state (tensioning of the traction cable).

[0025] Figure 2 This is a schematic diagram of the main structure of this utility model in the case of wire rope breakage and trigger braking state (traction cable slack).

[0026] Figure 3 This is a schematic diagram of the left-side structure of this utility model.

[0027] The components are: 1. cage body; 2. guide rail; 3. pulley; 4. limiting plate; 5. connecting arm; 51. lifting hole; 6. rotating shaft; 7. brake wheel; 8. torsion spring; 9. drive arm; 10. traction cable; 11. counterweight; 12. extension plate; 13. protrusion. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0029] like Figure 1-3 As shown, the present invention provides a cage anti-fall device with a dual triggering mechanism, which mainly includes a cage body 1, a vertically arranged guide rail 2, and an anti-fall component.

[0030] The cage body 1 slides along the guide rail 2 via multiple pulleys 3 mounted on its side, allowing it to move up and down along the guide rail 2. A limiting plate 4 is welded and fixed to the top of the cage body 1. The connecting arm 5 is hinged to the top of the cage body 1 via a pin, and has a lifting hole 51 at its top for connecting a hook. The limiting plate 4 is located beside the connecting arm 5 to limit excessive rotation of the connecting arm 5 to that side.

[0031] The fall arrestor assembly is mounted on the top of the cage body 1. The rotating shaft 6 is rotatably supported on the cage body 1 via a bearing seat (not shown separately in the figure). In this embodiment, the brake wheel 7 is an eccentric wheel, fixedly mounted on the extended end of the rotating shaft 6 via a key connection. The drive arm 9 is also fixedly sleeved on the rotating shaft 6. A torsion spring 8 is sleeved on a specially designed small-diameter end 61 of the rotating shaft 6. The cage body 1 has an upward-facing protrusion 13. One end of the torsion spring 8 is hooked onto the protrusion 13, and the other end is hooked onto the brake wheel 7, thereby ensuring that the torsion spring 8 always applies a torque to the rotating shaft 6, driving the brake wheel 7 to rotate in the direction of the guide rail 2.

[0032] One end of the traction cable 10 (which may be a steel wire rope) is fixed to the bottom end of the drive arm 9, and the other end is fixed to the middle of the connecting arm 5. The counterweight 11 is fixed to an extension plate 12 that is inclinedly welded to the outer edge of the brake wheel 7 by welding or bolting. This structure makes the center of gravity of the counterweight 11 far away from the center line of the rotating shaft 6.

[0033] The working principle of this utility model is as follows:

[0034] Normal boost status (e.g.) Figure 1 The lifting device raises the connecting arm 5 upwards via the hook. The connecting arm 5 rotates clockwise around the hinge point (as shown in the diagram), tightening the traction cable 10. The tension of the traction cable 10 acts on the drive arm 9, generating a torque that overcomes the torque of the torsion spring 8, causing the rotating shaft 6 and the brake wheel 7 fixed thereon to rotate counterclockwise, moving the contour surface of the brake wheel 7 away from the guide rail 2, placing it in a "standby position". At this time, the cage can be raised and lowered freely. During this process, the torsion spring 8 is twisted, storing elastic potential energy; simultaneously, the counterweight 11 is raised to its highest position, storing gravitational potential energy.

[0035] The wire rope broke, triggering the brakes (e.g.) Figure 2 When the hoisting wire rope breaks, the cage loses weight and falls. The connecting arm 5 loses its upward tension and swings back under the action of gravity or inertia, causing the traction cable 10 to slacken instantly.

[0036] Main triggering path (torsion spring drive): After the traction cable 10 is released, the tension acting on the drive arm 9 disappears. The elastic potential energy stored in the torsion spring 8 is immediately released, generating torque to drive the rotating shaft 6 to rotate clockwise, causing the brake wheel 7 to quickly press against the side of the guide rail 2.

[0037] Backup trigger path (counterweight gravity drive): Simultaneously, the counterweight 11, positioned at a higher level, generates a gravitational torque under gravity due to its center of gravity being offset from the axis of rotation, causing the brake wheel 7 to rotate counterclockwise. Even assuming the torsion spring 8 fails and cannot provide torque, the gravitational torque of the counterweight 11 alone is sufficient to drive the brake wheel 7 to press against the guide rail 2. To prevent the counterweight from being blocked by the cage body 1 during counterclockwise rotation and thus unable to continue rotating, a clearance hole can be opened at the corresponding position on the cage body 1, allowing the counterweight to pass through the cage body 1 and continue rotating, thereby increasing the friction between the brake wheel 7 and the guide rail 2.

[0038] Regardless of which path is taken or whether both are combined, the brake wheel 7 will eventually rotate to the "braking position" where it is in close contact with the side of the guide rail 2. As the cage continues to fall, a huge sliding friction force is generated between the brake wheel 7 and the guide rail 2. This friction force automatically increases as the brake wheel 7 rotates further until it balances the downward force of the cage, thereby allowing the cage to decelerate smoothly and eventually come to a complete stop.

[0039] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0040] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A cage fall prevention device with a dual triggering mechanism, characterized in that, The system includes a cage body and a guide rail. The cage body is slidably connected to the guide rail via pulleys. A limit plate is fixed to the top of the cage body. A connecting arm is hinged to the top of the cage body and at least one fall protection component is installed thereon. The fall protection component includes: A rotating shaft, with both ends of which are rotatably connected to the cage body; Brake wheel, fixed to the end of the shaft; A torsion spring is fitted onto the end of the rotating shaft, with its two ends connected to the cage body and the brake wheel, respectively. The drive arm is fixed on the rotating shaft; The traction cable is fixed at one end to the drive arm and at the other end to the connecting arm; The counterweight is fixed to the brake wheel.

2. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The top of the connecting arm has a lifting hole for attaching a hook.

3. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The limiting plate is located on one side of the connecting arm and is used to prevent the connecting arm from rotating excessively.

4. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The cage body is provided with an upward protrusion, and the torsion spring is connected to the cage body through the protrusion.

5. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The outer diameter of one end of the shaft is smaller than the outer diameter of the shaft body. The torsion spring is located at the small diameter end of the shaft and is configured to be twisted and store energy when the traction cable is tensioned.

6. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The counterweight is fixed to an extension plate that is inclinedly connected to the outer edge of the brake wheel, so that the center of gravity of the counterweight is offset from the center of the pivot, and is configured to be lifted to a high position when the traction cable is tensioned to store gravitational potential energy.

7. The cage fall prevention device with a dual triggering mechanism according to claim 1, characterized in that, The brake wheel is an eccentric wheel, configured to be in a standby position away from the guide rail when the traction cable is tensioned, and to rotate to the braking position where it rubs against the guide rail when the traction cable is slack due to elastic force or gravity.

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