Mine hoist cage anti-falling device

Abstract

This utility model discloses a mine hoist cage anti-fall device, comprising a frame, guide bars, and a speed sensor. The frame is equipped with guide bars and sprockets adapted to the chain. A speed sensor, a rotating shaft, and a positioning post are mounted on one side of the frame, with a spring connected to the positioning post. This utility model transmits the chain speed via the sprocket, which is then acquired by the speed sensor. When the chain speed exceeds a set value, the electromagnetic base is de-energized, causing the ratchet to rotate under the action of the spring. This causes the pawl to engage with the chain, and the guide bar's locking end face further limits the chain's movement, thus achieving automatic anti-fall. Compared to existing hoist cage anti-fall structures, this utility model adopts an integrated design of "speed monitoring - electromagnetic control - mechanical braking," solving the stability, adaptability, and response speed problems of existing devices. Its structure is simple, and it is installed on the outside of the hoist, facilitating retrofitting.

Description

Technical Field

[0001] This utility model relates to the field of coal mine production equipment technology, and more specifically, to a mine hoist cage anti-fall device. Background Technology

[0002] In underground coal mine operations, mine hoists, as key equipment connecting underground tunnels to the surface, undertake the vertical transportation of personnel, equipment, and materials. Their operational safety directly affects the smooth progress of coal mine production and the safety of workers. Among these components, the hoist cage, as the core load-bearing component, has the most crucial fall protection capability to ensure safe operation.

[0003] Currently, most existing mine hoist cage fall prevention devices employ mechanical caliper, wedge, or brake-linked structures. Mechanical caliper devices use calipers on both sides of the cage; when the cage overspeeds or the chain breaks, the calipers, under gravity or spring force, contact the guide bars in the shaft, generating friction to achieve braking. However, this type of device is susceptible to issues related to the flatness of the guide bar surface, leading to jamming or unstable braking performance. Wedge-type devices utilize the self-locking principle between the wedge and the guide bar to prevent falls, but they require extremely high precision in the fit between the wedge and the guide bar; long-term wear of the wedge can cause delayed braking response. Brake-linked devices rely on the synchronous action of the hoist's main brake; if the main brake fails or the control system malfunctions, the fall prevention function will completely fail, posing a safety hazard.

[0004] Furthermore, traditional fall arrest devices are mostly integrated into the hoist's drive system or the cage itself, resulting in complex structures and significant modification difficulties. Upgrading older mine hoists requires large-scale dismantling of the existing equipment, increasing costs and extending downtime, thus impacting mine production efficiency. Additionally, some fall arrest devices lack real-time speed monitoring and intelligent response mechanisms, making it difficult to dynamically adjust braking timing based on the cage's actual operating speed. This poses a risk of braking too early or too late, failing to meet the high-precision safety requirements of modern coal mines.

[0005] Therefore, in response to the problems of existing fall protection devices, such as complex structure, poor braking stability, high modification difficulty, and untimely response, it is of great significance to develop a fall protection device for mine hoist cages that is simple in structure, easy to install, reliable in braking, and capable of intelligent monitoring and rapid response. This is of great significance for improving the safety assurance capability of underground coal mine hoists and reducing the risk of production accidents. Utility Model Content

[0006] This utility model provides a fall prevention device for a mine hoist cage. By obtaining the speed of the chain through a speed sensor and controlling the electromagnetic base to cut off the power, the pawl can be used to engage the chain, thus solving the problems of complex structure, poor braking stability and high modification difficulty of existing fall prevention devices.

[0007] According to one aspect of this utility model, a mine hoist cage anti-fall device is provided. The cage is equipped with a chain, and the movement of the chain drives the cage to move up and down. The mine hoist cage anti-fall device includes a frame, guide bars, and a speed sensor. The frame is equipped with guide bars and sprockets adapted to the chain. A speed sensor, a rotating shaft, and a positioning post are installed on the frame on one side of the sprocket. A spring is connected to the positioning post. A ratchet is installed on the rotating shaft. The outer edge of the ratchet is provided with multiple pawls. One of the pawls is connected to the spring, and another pawl is provided with an ear plate. A magnetic pusher is hinged to the ear plate. The pusher is mounted on an electromagnetic base hinged to the frame.

[0008] Preferably, based on the above scheme, the guide bar is provided with a locking hole adapted to the pawl, and the pusher is slidably mounted on the electromagnetic base.

[0009] Based on the above scheme, preferably, the guide bar includes an inner limiting plate and an outer limiting plate, and the inner limiting plate and the outer limiting plate are spaced apart to form a guide space through which the chain passes.

[0010] Based on the above scheme, the inner limiting plate is preferably formed by two straight, vertically spaced, straight-lined card holes.

[0011] Based on the above scheme, preferably, the inner limiting plate is provided with a groove that is compatible with the chain.

[0012] Based on the above scheme, the preferred embodiment is that the frame includes a bottom plate and a top plate, the bottom plate and the top plate are spaced apart and connected by connecting columns.

[0013] Preferably, based on the above scheme, the speed sensor is coupled to the sprocket, and the frame is provided with a plate for mounting the speed sensor.

[0014] This utility model discloses a mine hoist cage anti-fall device. After the chain speed is transmitted through the sprocket and acquired by the speed sensor, when the chain speed exceeds the set value, the electromagnetic base is de-energized. The ratchet is driven to rotate under the action of the spring, causing the pawl to engage in the chain. Under the limiting action of the guide bar's locking end face, the movement of the chain is restricted, thereby achieving the purpose of automatic anti-fall.

[0015] Compared with existing elevator cage anti-fall structures, this utility model adopts an integrated design of "speed monitoring-electromagnetic control-mechanical braking", which solves the problems of stability, adaptability and response speed of existing devices. Its structure is simple, and it is installed on the outside of the elevator, making it easy to modify. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a mine hoist cage anti-fall device according to the present invention;

[0018] Figure 2 This is a perspective view of the mine hoist cage anti-fall device of this utility model;

[0019] Figure 3 This is a perspective view of the mine hoist cage anti-fall device of the present invention after the roof plate has been removed;

[0020] Figure 4 This is a first-state diagram of the mine hoist cage anti-fall device of this utility model.

[0021] Figure 5 This is a second state diagram of the mine hoist cage anti-fall device of this utility model.

[0022] Explanation of icon numbers:

[0023] 1.1 Hoist cage; 1.2 Chain; 2.3 Speed ​​sensor; 2.4 Sprocket; 3.1 Base plate; 3.2 Top plate; 3.3 Connecting column; 3.4 Plate body; 4. Guide bar; 4.1 Inner limit plate; 4.2 Outer limit plate; 4.3 Guide space; 4.4 Locking hole; 4.5 Groove body; 5.1 Rotating shaft; 5.2 Positioning column; 5.3 Spring; 5.4 Ratchet; 5.5 Pawl; 5.6 Ear plate; 5.7 Push head; 5.8 Electromagnetic base. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0026] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0027] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0029] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] Please see Figure 1 and combined Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a mine hoist cage 1.1 anti-fall device. The cage 1.1 is connected to a chain 1.2 that drives the cage 1.1 to move up and down. The movement of the chain 1.2 drives the cage 1.1 to move up and down.

[0032] The mine hoist cage 1.1 anti-fall device of this utility model includes a frame, a guide bar 4 and a speed sensor 2.3. The frame is used to provide the installation foundation, while the guide bar 4 limits the swing of the chain 1.2 on the one hand and serves as the foundation for the ratchet 5.4 on the other hand.

[0033] Specifically, the frame of this utility model includes a base plate 3.1 and a top plate 3.2, which are spaced apart and connected by connecting posts 3.3. The guide bars 4 are spaced parallel to each other between the top plate 3.2 and the base plate 3.1 along the direction of chain 1.2. A speed sensor 2.3 mounted on the base plate 3.1 is coupled to a sprocket 2.4. When the chain 1.2 moves, the sprocket 2.4 meshes with the chain 1.2, causing the sprocket 2.4 to rotate. The speed sensor 2.3 obtains the speed of the chain 1.2 through the sprocket 2.4. It should be noted that the plate 3.4 for mounting the speed sensor 2.3 is located on the upper part of the base plate 3.1.

[0034] The frame includes a plate 3.4 for mounting the speed sensor 2.3.

[0035] The base plate 3.1 of this utility model is provided with a guide bar 4 and a sprocket 2.4 adapted to the chain 1.2. A speed sensor 2.3, a rotating shaft 5.1 and a positioning post 5.2 are installed on the frame on one side of the sprocket 2.4. The sprocket 2.4 is located on the upper side. The speed sensor 2.3 is arranged opposite to the sprocket 2.4 and is used to obtain the speed of the sprocket 2.4.

[0036] The rotating shaft 5.1 and the positioning post 5.2 are located below the sprocket 2.4, and a spring 5.3 is connected to the positioning post 5.2. A ratchet 5.4 is mounted on the rotating shaft 5.1. Two pawls 5.5 are provided on the outer edge of the ratchet 5.4. One pawl 5.5 is connected to the spring 5.3, and an ear plate 5.6 is provided on the side end face of the other pawl 5.5. A magnetic push head 5.7 is hinged to the ear plate 5.6. The push head 5.7 is slidably mounted on the electromagnetic base 5.8, and the electromagnetic base 5.8 is hinged to the base plate 3.1.

[0037] The guide bar 4 is provided with a locking hole 4.4 that matches the pawl 5.5. The push head 5.7 is slidably mounted on the electromagnetic base 5.8. It should be noted that when the electromagnetic base 5.8 is energized, it generates a magnetic field that attracts the push head 5.7. At this time, the push head 5.7 is in a retracted state and the spring 5.3 is in a stretched state.

[0038] Normal operating condition: Electromagnetic base 5.8 is energized, pusher 5.7 maintains contact with pawl 5.5 under electromagnetic force, spring 5.3 is in a stretched state, ratchet 5.4 and pawl 5.5 remain stationary, pawl 5.5 does not contact chain 1.2, chain 1.2 runs normally along guide bar 4, speed sensor 2.3 monitors the speed of chain 1.2 in real time and transmits it to the control system, as detailed below. Figure 4 As shown.

[0039] Abnormal Trigger Status: When the cage 1.1 overspeeds (speed exceeds the set threshold) or the chain 1.2 breaks, causing a sudden increase in speed, the speed sensor 2.3 sends a signal to the control system, and the control system immediately cuts off the power to the electromagnetic base 5.8, as detailed below. Figure 5 As shown.

[0040] Braking process: After the electromagnetic base 5.8 is de-energized, the electromagnetic force disappears, the spring 5.3 releases and automatically retracts, driving the ratchet 5.4 to rotate around the shaft 5.1. The pawls 5.5 on the ratchet 5.4 rotate together, and one of the pawls 5.5 quickly engages in the gap between the links of the chain 1.2. The pawl 5.5 engages in the locking hole 4.4 of the guide bar 4. Under the inertial force of the chain 1.2 and the limiting action of the end face of the locking hole 4.4, the chain 1.2 is forcibly locked, and the cage 1.1 stops falling.

[0041] Reset operation: After troubleshooting, power on the electromagnetic base 5.8 manually or electrically. The pusher 5.7 resets and pushes the pawl 5.5 out of the jamming hole 4.4 and the chain 1.2. The spring 5.3 is recompressed, and the device returns to normal operation.

[0042] Specifically, the guide strip 4 of this utility model includes an inner limiting plate 4.1 and an outer limiting plate 4.2. The inner limiting plate 4.1 and the outer limiting plate 4.2 are spaced apart to form a guide space 4.3 through which the chain 1.2 passes. The inner limiting plate 4.1 has two vertically spaced, linearly arranged locking holes 4.4. This utility model also provides a groove 4.5 on the inner limiting plate 4.1 that is compatible with the chain 1.2.

[0043] Compared with the existing 1.1 anti-fall structure of the hoist cage, this utility model adopts an integrated design of "speed monitoring-electromagnetic control-mechanical braking", which solves the problems of stability, adaptability and response speed of the existing device. Its structure is simple, it is installed on the outside of the hoist, and it is easy to modify; and it has the following advantages:

[0044] 1. High safety: Real-time monitoring via speed sensors and rapid response via electromagnetic control result in short braking trigger time, effectively avoiding the risk of cage falling.

[0045] 2. High stability: The rigid fit between the mechanical pawl and the guide rail chuck ensures that the braking effect is not affected by environmental factors, and the chuck limits the rotation angle to avoid over-braking;

[0046] 3. Good adaptability: The device is installed independently on the outside of the hoist, without the need to modify the original equipment structure, which is convenient for the retrofitting and upgrading of old mine hoists;

[0047] 4. Simple structure: fewer core components, convenient maintenance, and reduced equipment operation and maintenance costs for coal mining enterprises.

[0048] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A fall prevention device for a mine hoist cage, wherein a chain is installed on the cage, and the movement of the chain drives the cage to move up and down, characterized in that... The mine hoist cage anti-fall device includes a frame, guide bars, and a speed sensor. The frame is equipped with guide bars and sprockets adapted to the chain. On one side of the sprocket, the frame is equipped with a speed sensor, a rotating shaft, and a positioning post. A spring is connected to the positioning post. A ratchet is mounted on the rotating shaft. The outer edge of the ratchet is provided with multiple pawls. One of the pawls is connected to the spring, and another pawl is provided with an ear plate. A magnetic pusher is hinged to the ear plate. The pusher is mounted on an electromagnetic base hinged to the frame.

2. The mine hoist cage anti-fall device as described in claim 1, characterized in that, The guide bar is provided with a locking hole that matches the pawl, and the pusher is slidably mounted on the electromagnetic base.

3. The mine hoist cage anti-fall device as described in claim 2, characterized in that, The guide bar includes an inner limiting plate and an outer limiting plate, and the inner limiting plate and the outer limiting plate are spaced apart to form a guide space through which the chain passes.

4. The mine hoist cage anti-fall device as described in claim 3, characterized in that, The inner limiting plate consists of two straight, vertically spaced plates that form the card holes.

5. A mine hoist cage anti-fall device as described in claim 3, characterized in that, The inner limiting plate is provided with a groove that is compatible with the chain.

6. The mine hoist cage anti-fall device as described in claim 1, characterized in that, The frame includes a base plate and a top plate, which are spaced apart and connected by connecting columns.

7. The mine hoist cage anti-fall device as described in claim 1, characterized in that, The speed sensor is coupled to the sprocket, and the frame is provided with a plate for mounting the speed sensor.

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