A coal mill rail crossing hoist anti-misoperation protection device
Patent Information
- Application Number
- CN202521916517.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-06
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-09-06
AI Technical Summary
部分传统过轨吊的行程开关等端部限位装置可能存在设计缺陷，可能会电动葫芦从轨道末端滑出坠落，进而造成人员伤亡
本实用新型在使用时，能够实现有效安全防护，减少误操作带来的风险问题。设备通过防偏滚轮与行程开关实现协同防护，防偏滚轮实时贴合 Y 轴固定轨侧面，在电动力车出现轻微跑偏趋势时便通过接触摩擦形成阻力，及时遏制偏移态势，避免因持续跑偏导致的轨道卡滞或结构磨损；而 Y 轴固定轨两端的行程开关与触发杠杆，能够在发生误操作导致电动力车向轨道端部快速移动，触发杠杆受撞击后会立即驱动行程开关切断行走回路，实现毫秒级紧急停机，从根本上杜绝电动力车冲出轨道的恶性事故。
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Figure CN224716260U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of crane technology, specifically to a protective device for preventing misoperation of a coal mill overpass crane. Background Technology
[0002] The coal mill rail-crossing crane, also known as the coal mill-supporting rail-crossing crane, is a specialized lifting device designed for the maintenance and repair of coal mills in industrial settings such as thermal power plants and large cement plants. Its core function is to lift, transport, and disassemble heavy components such as grinding rollers, liners, and main shafts inside the coal mill. It is named the rail-crossing crane because it needs to cross the coal mill body or related rails during operation.
[0003] Traditional safety protection mechanisms for some rail-mounted overhead cranes are inadequate, lacking guiding and limiting devices, resulting in numerous shortcomings in practical use. The end limit devices, such as limit switches, of some traditional rail-mounted cranes may have design flaws, potentially causing the electric hoist to slip off the rail and fall, leading to injury or death. Furthermore, the electrical interlocking protection functions of some rail-mounted cranes may be insufficient, failing to effectively prevent dangers caused by misoperation, thus exhibiting certain limitations. Therefore, we propose a misoperation prevention protection device for rail-mounted cranes used in coal mills. Utility Model Content
[0004] One of the technical problems this application aims to solve is that the traditional safety protection mechanism for partially cross-rail cranes is incomplete, lacking guidance and limiting devices, and has many shortcomings in actual use.
[0005] To address the aforementioned technical problems, this application provides a protective device for preventing misoperation of a coal mill overhead crane, comprising multiple Y-axis fixed rails, an electric motor trolley suspended below each Y-axis fixed rail, an anti-deviation roller fixedly installed at one end of each electric motor trolley, limit switches fixedly installed at both ends of each of the multiple Y-axis fixed rails, trigger levers rotatably installed on both sides of each of the multiple limit switches, and an X-axis moving rail fixedly installed in the middle below every two electric motor trolleys.
[0006] In some embodiments, an electric hoist trolley is suspended below the middle of the X-axis moving rail, and a hoisting rope is wound around the middle of the electric hoist trolley.
[0007] In some embodiments, a hook is fixedly installed at one end of the sling.
[0008] In some embodiments, a first track alignment device is rotatably mounted on one side of the end of one of the adjacent X-axis moving rails, and a second track alignment device is rotatably mounted on one side of the end of the other of the adjacent X-axis moving rails.
[0009] In some embodiments, the first rail alignment device and the second rail alignment device are rotatably engaged.
[0010] This utility model has at least the following beneficial effects: This invention provides effective safety protection during use, reducing the risks associated with misoperation. The device utilizes anti-deviation rollers and limit switches for coordinated protection. The anti-deviation rollers maintain constant contact with the side of the Y-axis fixed rail, creating resistance through contact friction when the electric vehicle shows a slight tendency to deviate, thus promptly curbing the deviation and preventing track jamming or structural wear caused by continuous deviation. Meanwhile, the limit switches and trigger levers at both ends of the Y-axis fixed rail can immediately activate the limit switches to cut off the travel circuit upon impact with the trigger levers if the electric vehicle moves rapidly towards the end of the rail due to misoperation, achieving a millisecond-level emergency stop and fundamentally preventing serious accidents such as the electric vehicle running off the track. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the first appearance structure of the present utility model; Figure 2 This is a schematic diagram of the second appearance structure of the present utility model; Figure 3 This is a schematic diagram showing the positional relationship between the Y-axis fixed rail and the limit switch of this utility model.
[0012] In the diagram: 1. Y-axis fixed rail; 11. Limit switch; 12. Trigger lever; 2. Electric motor vehicle; 21. Anti-deviation roller; 3. X-axis moving rail; 31. Rail alignment device one; 32. Rail alignment device two; 33. Electric hoist vehicle; 34. Lifting rope; 35. Lifting hook. Detailed Implementation
[0013] 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.
[0014] Example 1: Please refer to Figure 1 - Figure 3 This utility model provides a technical solution: a protective device for preventing misoperation of a coal mill overrail crane, including multiple Y-axis fixed rails 1, an electric motor 2 suspended below the Y-axis fixed rails 1, an anti-deviation roller 21 fixedly installed at one end of the electric motor 2, limit switches 11 fixedly installed at both ends of the multiple Y-axis fixed rails 1, trigger levers 12 rotatably installed on both sides of the multiple limit switches 11, and an X-axis moving rail 3 fixedly installed in the middle below every two electric motor 2.
[0015] In this embodiment, the anti-deviation roller 21 can monitor the operating status of the electric vehicle 2 in real time. When the electric vehicle 2 shows a tendency to deviate, the anti-deviation roller 21 will contact the Y-axis fixed rail 1 to prevent the electric vehicle 2 from deviating further, thereby preventing accidents such as derailment of the electric vehicle 2. At the same time, the limit switches 11 at both ends of the Y-axis fixed rail 1 cooperate with the trigger levers 12. When the electric vehicle 2 approaches the end of the rail, the trigger levers 12 will be pushed, causing the limit switches 11 to act, cutting off the travel circuit of the electric vehicle 2 and stopping its operation, thus preventing the electric vehicle 2 from running off the rail and causing equipment damage and personal injury. The roller 21 guides and limits the electric vehicle 2 during operation, reducing its swaying and deviation, and enabling it to run more stably on the Y-axis fixed rail 1. The limit switch 11 accurately detects the position of the electric vehicle 2. When the electric vehicle 2 reaches the predetermined position, the limit switch 11 sends a signal to notify the control system that the electric vehicle 2 has arrived in position. With the anti-deviation roller 21 and the limit switch 11, the electric vehicle 2 can operate more safely, stably, and accurately, reducing downtime and production efficiency losses caused by equipment failure and inaccurate positioning.
[0016] Example 2: As Figure 1 - Figure 2 As shown, an electric hoist trolley 33 is suspended below the middle of the X-axis moving rail 3. A hoisting rope 34 is wound around the middle of the electric hoist trolley 33. A hook 35 is fixedly installed at one end of the hoisting rope 34. A rail alignment device 1 31 is rotatably installed on one side of the end of one of the adjacent X-axis moving rails 3. A rail alignment device 2 32 is rotatably installed on one side of the end of the other adjacent X-axis moving rail 3. The rail alignment device 1 31 and the rail alignment device 2 32 are rotatably engaged.
[0017] In this embodiment, the electric hoist trolley 33 is a key component for lifting and lowering goods. It uses internal drive devices such as a motor and reducer to wind or release the lifting rope 34, thereby controlling the lifting and lowering of the hook 35. This enables the lifting and lowering of goods such as coal mill components, facilitating installation and maintenance. The main function of the rail alignment devices 31 and 32 is to achieve precise docking and reliable connection between adjacent X-axis moving rails 3. When the electric hoist trolley 33 needs to be moved from one X-axis moving rail 3 to another, the rail alignment devices 31 and 32 rotate and engage, ensuring accurate alignment of the two rails. This provides a continuous and stable running track for the electric hoist trolley 33, allowing it to pass safely and smoothly through the rail interface and preventing accidents such as derailment due to rail misalignment. The rail alignment device typically consists of a motor drive system, a linkage mechanism, and positioning elements. When alignment is required, the motor drives the linkage mechanism to rotate and bring the alignment devices 31 and 32 closer together until they are locked together. During the locking process, positioning elements such as positioning pins and positioning grooves ensure the accuracy and stability of the alignment.
[0018] Working principle: like Figure 1 - Figure 3 As shown, the Y-axis fixed rail 1 provides a longitudinal running track for the electric vehicle 2, with the electric vehicle 2 serving as the load-bearing foundation and the X-axis moving rail 3 suspended below. An anti-deviation roller 21 fixed at one end of the electric vehicle 2 maintains a preset gap with the side of the Y-axis fixed rail 1 during operation. On one hand, the roller's rolling characteristics provide auxiliary guidance for the electric vehicle 2, reducing lateral sway and deviation during operation and ensuring stable movement of the electric vehicle 2 along the axis of the Y-axis fixed rail 1. On the other hand, when the electric vehicle 2 shows a tendency to deviate due to factors such as track wear or uneven load, the anti-deviation roller 21 will first contact the side of the Y-axis fixed rail 1, using the friction between the roller and the track to form lateral resistance, preventing the electric vehicle 2 from further deviating from the track axis. When the electric vehicle 2 moves along the Y-axis fixed rail 1 towards the end, such as approaching the track end or a preset stopping position, the side of the electric vehicle 2 will first contact the trigger levers 12 on both sides of the limit switch 11 at the end of the Y-axis fixed rail 1. When the trigger lever 12 is pushed, it rotates around the mounting shaft. Its other end will squeeze the internal contact mechanism of the limit switch 11, causing the normally closed contact of the limit switch 11 to open. The contact is connected in series in the travel drive circuit of the electric vehicle 2. After the contact opens, the power supply to the travel motor is directly cut off, and the electric vehicle 2 stops running immediately, so as to avoid the equipment running off the track due to misoperation or inertia, which could cause damage to components or personal injury.
[0019] The X-axis moving rail 3 serves as the transverse running track of the electric hoist 33, which moves along the X-axis through its own drive system. The electric hoist trolley 33 integrates a motor, reducer, drum, and other drive devices. When lifting goods, the motor starts and transmits power to the reducer through a coupling. The reducer reduces the speed and increases the torque, causing the drum to rotate clockwise. The lifting rope 34 is wound around the surface of the drum, and the hook 35 fixed at the other end of the rope 34 rises synchronously with the winding action of the drum until the hook contacts and lifts the coal mill components such as grinding rollers and liners. When lowering goods, the motor reverses its rotation, causing the drum to rotate counterclockwise. The lifting rope 34 is slowly released from the drum under the weight of the goods, and the hook 35 descends smoothly with the release of the rope 34 until the goods are placed in the designated position, such as a maintenance platform or transport trolley. When the electric hoist trolley 33 needs to be transferred from one X-axis moving rail 3 to another adjacent X-axis moving rail 3, the rail alignment device 1 31 and the rail alignment device 2 32 are rotated and engaged to achieve precise alignment and switching of the rails.
[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A protective device for preventing misoperation of a coal mill overhead crane, comprising multiple Y-axis fixed rails (1), characterized in that: An electric vehicle (2) is suspended below the Y-axis fixed rail (1). An anti-deviation roller (21) is fixedly installed at one end of the electric vehicle (2). Limit switches (11) are fixedly installed at both ends of the multiple Y-axis fixed rails (1). Trigger levers (12) are rotatably installed on both sides of the multiple limit switches (11). An X-axis moving rail (3) is fixedly installed in the middle of the bottom of every two electric vehicles (2).
2. The anti-misoperation protection device for a coal mill overhead crane according to claim 1, characterized in that: An electric hoist cart (33) is suspended below the middle of the X-axis moving rail (3), and a hoisting rope (34) is wound around the middle of the electric hoist cart (33).
3. The anti-misoperation protection device for a coal mill overhead crane according to claim 2, characterized in that: A hook (35) is fixedly installed at one end of the sling (34).
4. The anti-misoperation protection device for a coal mill overhead crane according to claim 2, characterized in that: One of the adjacent X-axis moving rails (3) is rotatably equipped with a rail-aligning device 1 (31) on one side of the end of one of the adjacent X-axis moving rails (3), and another of the adjacent X-axis moving rails (3) is rotatably equipped with a rail-aligning device 2 (32) on one side of the end of the other X-axis moving rail (3).
5. The anti-misoperation protection device for a coal mill overhead crane according to claim 4, characterized in that: The first track alignment device (31) and the second track alignment device (32) are rotatably engaged.