A motor-driven rail sling

Abstract

The application relates to a motor-driven steel rail lifting appliance and relates to the technical field of steel rail lifting equipment. The steel rail lifting appliance comprises a box body, a base plate is arranged in the box body, a motor is arranged on the base plate, the motor is drivingly connected with a rotating sleeve, the rotating sleeve penetrates through a bearing box, a nut is sleeved in the end of the rotating sleeve, the nut is in threaded transmission with a lead screw, the lead screw is connected with a supporting shaft, and a clamping assembly is arranged at the two ends of the supporting shaft. The clamping assembly comprises a guide plate, the guide plate is arranged on the two sides of the box body, the supporting shaft penetrates through the intersection point of a first lifting hook and a second lifting hook and is connected with the guide plate, one end of the first lifting hook is arranged in a first guide channel of the guide plate and a first follow-up channel of the box body, and the other end of the first lifting hook is provided with a first hook head; one end of the second lifting hook is arranged in a second guide channel of the guide plate and a second follow-up channel of the box body, and the other end of the second lifting hook is provided with a second hook head; and the first guide channel and the second guide channel are inclined and symmetrically arranged. The application solves the problem that the traditional lifting appliance relies on manual operation or continuous power output, and improves the operation safety and stability.

Description

Technical Field

[0001] This application relates to the technical field of rail hoisting equipment, and in particular to a motor-driven rail hoist. Background Technology

[0002] In scenarios such as rail transit engineering and metallurgical steel plants, the handling and installation of rails rely on lifting tools. Traditional rail lifting tools are mainly divided into manual mechanical lifting tools, hydraulically driven lifting tools, and electric lifting tools.

[0003] Manual lifting devices rely on manually rotating a screw to clamp the rail with a hook. However, the limited manual force makes it difficult to maintain uniform clamping force, increasing the risk of rail slippage and displacement during lifting. Furthermore, manual operation is extremely inefficient for heavy rails, and operators must be close to the lifting area, posing a risk of injury from falling rails. Hydraulic lifting devices use hydraulic cylinders to move the hook, providing significant clamping force and semi-automatic operation. However, hydraulic oil leaks due to aging seals, contaminating the rail surface (affecting subsequent welding quality) and causing unstable hydraulic pressure, leading to fluctuations in hook clamping force. Electric lifting devices use a motor to drive a lead screw or gear mechanism to move the hook. While highly automated, current electric lifting devices lack self-locking functionality and rely on continuous motor power to maintain clamping force. A power outage can cause the rail to slip, compromising safety. Utility Model Content

[0004] To address the problem that traditional rail lifting devices cannot guarantee the stable lifting of rails, this application provides a motor-driven rail lifting device.

[0005] This application provides a motor-driven rail lifting device, which adopts the following technical solution: A motor-driven rail lifting device includes a housing, a base plate installed inside the housing, a bearing housing and a motor mounted on the bearing housing, a rotating sleeve driven by the output end of the motor, the rotating sleeve passing through the bearing housing, and a nut fitted inside the end of the rotating sleeve, a lead screw being threaded through the nut, and a support shaft being connected to the other end of the lead screw, with clamping assemblies symmetrically installed at both ends of the support shaft; The clamping assembly includes a guide plate, a first hook, and a second hook. The guide plate is installed on both sides of the housing. The first hook and the second hook are arranged crosswise, and the support shaft passes through the intersection of the first hook and the second hook and is connected to the guide plate. One end of the first hook is slidably disposed on the first guide track of the guide plate and the first follower track of the housing, and the other end is equipped with a first hook head for gripping the rail. One end of the second hook is slidably disposed on the second guide track of the guide plate and the second follower track of the housing, and the other end is equipped with a second hook head for gripping the rail. The first guide track and the second guide track are inclined and symmetrically arranged, so that self-locking is achieved when the first hook and the second hook grip the rail.

[0006] By adopting the above technical solution, the housing provides protection and a foundation for the entire lifting device, the base plate serves as the mounting carrier for internal components, and the motor drives the nut to rotate via a rotating sleeve. The rotational motion is converted into linear motion of the support shaft using a lead screw and nut transmission, driving the clamping assembly. The first and second hooks open and close synchronously using inclined symmetrical guide rails. When gripping the rail, the inclined angle of the guide rails forms a self-locking structure, maintaining the clamping state without continuous motor output. Compared to traditional lifting devices, this improves operational safety and automation, making it suitable for various rail lifting scenarios.

[0007] Optionally, the first follower channel and the first guide channel have the same shape and overlap in path, the second follower channel and the second guide channel have the same shape and overlap in path, and the first follower channel, the second follower channel, the first guide channel and the second guide channel are all provided with elongated holes.

[0008] By adopting the above technical solution, the follower and guide tracks with the same shape and overlapping paths form a double guiding constraint, ensuring that the hook's trajectory is consistent during movement and avoiding jamming or deviation. The elongated hole structure provides ample travel space for the hook's sliding, and the double guidance further enhances the stability and accuracy of the hook's movement, ensuring reliable clamping action.

[0009] Optionally, one end of the first hook is provided with a first guide post and a first locking member. The first guide post passes through the first guide channel, the first hook and the first follower channel in sequence, and the first locking member is provided at its end. The second hook is provided with a second guide post and a second locking member at one end. The second guide post passes through the second guide channel, the second hook and the second follower channel in sequence, and the second locking member is provided at its end.

[0010] By adopting the above technical solution, the guide post, as the connecting component between the hook and the guide and follower tracks, restricts the sliding movement of the hook within a preset trajectory, ensuring smooth movement. The locking component effectively prevents the guide post from detaching from the guide structure, ensuring connection reliability, while also facilitating component disassembly and maintenance.

[0011] Optionally, guide shafts are installed on both sides of the support shaft with the axis of the lead screw as the center line. The guide shafts are parallel to the support shaft. The guide shafts pass through the base plate and are fitted with linear bearings, which are mounted on the base plate.

[0012] By adopting the above technical solution, the guide shafts symmetrically arranged on both sides are parallel to the support shaft, effectively restricting the rotational freedom of the support shaft and ensuring that it only performs axial linear motion. The linear bearing reduces the frictional resistance during the movement of the guide shaft, making the movement of the support shaft smoother and less strenuous, reducing the motor load, and at the same time ensuring the straightness of the support shaft's movement, thus improving the accuracy of the clamping assembly's actions.

[0013] Optionally, a control component is also included. A proximity switch is mounted on the base plate and is located on one side of the guide shaft. Switch assemblies are mounted on both sides of the housing near the clamping assembly. The control component is electrically connected to the proximity switch, the switch assembly, and the motor, respectively.

[0014] By adopting the above technical solution, the proximity switch detects the position of the guide shaft in real time to determine whether the movement stroke of the support shaft is in place; the switch assembly senses the contact state between the lifting device and the rail. The control assembly receives and analyzes the signals from both, automatically controlling the start, stop, and forward / reverse rotation of the motor, realizing automated operation of the lifting device, reducing manual intervention, improving operational efficiency, and avoiding equipment damage or safety accidents caused by improper operation.

[0015] Optionally, the switch assembly includes a switch base body, which is installed on the side of the guide plate away from the first hook. A sliding pin is connected to the bottom of the switch base body, and a rail contact plate is installed at the bottom end of the sliding pin. The other end of the sliding pin passes through the inner cavity of the switch base body and is connected to a contact, which is located inside the inner cavity. A return spring is sleeved on the outside of the sliding pin, and the two ends of the return spring abut against the bottom of the switch base body and the top of the rail contact plate, respectively.

[0016] By adopting the above technical solution, when the rail contact plate contacts the rail, it pushes the sliding pin upward, causing the contact trigger signal to be transmitted to the control component, thus achieving accurate detection of the rail position. After the rail contact plate disengages from the rail, the return spring pushes the sliding pin back to its original position, ensuring that the switching component can operate reliably and repeatedly, accurately reflecting the relative position of the lifting device and the rail, and providing precise signal input to the control component.

[0017] Optionally, a rail head guide plate is installed between the guide plate and the switch base.

[0018] By adopting the above technical solution, the rail head guide plate guides and positions the rail head, ensuring the rail is precisely positioned within the hook's clamping range as the lifting device approaches it, thus preventing grab failure due to alignment deviations. Simultaneously, the rail head guide plate reduces direct collisions between the rail and other components, providing protection and improving the ease and reliability of lifting device operation.

[0019] Optionally, handles are provided at the top and bottom of the housing, and mounting shafts are provided at both ends of the housing.

[0020] By adopting the above technical solution, the top and bottom handles facilitate the handling, installation, and maintenance of the lifting device, improving ease of use. The mounting shafts at both ends provide standardized interfaces for connecting the lifting device to the lifting equipment, ensuring a stable and reliable connection, adapting to the installation requirements of different models of lifting equipment, and expanding the applicability of the lifting device.

[0021] In summary, this application includes at least one of the following beneficial technical effects: This lifting device uses a motor-driven lead screw and nut transmission, combined with a cross hook structure, to achieve automated gripping of steel rails. The inclined guide rail enables the hook to form a reliable self-locking during gripping, solving the problem of traditional lifting devices relying on manual operation or continuous power output, and improving operational safety and stability. The structure, which combines a guide shaft with a linear bearing and features double guide rail constraints, ensures the accuracy and smoothness of the spreader's movement, reduces component wear, extends service life, and lowers maintenance costs. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of an embodiment of this application; Figure 3 This is a partial structural diagram of the internal components in an embodiment of this application; Figure 4 This is a schematic diagram of the clamping component in an embodiment of this application; Figure 5 This is a schematic diagram of the clamping component from another angle in an embodiment of this application; Figure 6 This is a structural schematic diagram of the box in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures: 11. Housing; 12. First follower track; 13. Second follower track; 14. Handle; 15. Mounting shaft; 16. Base plate; 17. Bearing housing; 18. Motor; 2. Rotating sleeve; 21. Nut; 3. Lead screw; 4. Support shaft; 5. Guide shaft; 51. Linear bearing; 6. Clamping assembly; 61. Guide plate; 611. First guide track; 612. Second guide track; 62. First hook; 621. First hook head; 63. Second hook; 631. Second hook head; 64. First guide post; 641. First locking element; 65. Second guide post; 651. Second locking element; 7. Proximity switch; 8. Switch assembly; 81. Switch base; 82. Sliding pin; 83. Rail contact plate; 84. Contact; 9. Rail head guide plate. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0028] This application discloses a motor-driven rail lifting device, referring to... Figures 1-6The motor-driven rail lifting device includes a housing 1, a base plate 15 installed inside the housing 1, a bearing housing 16 and a motor 17 mounted on the bearing housing 16, the output end of the motor 17 is connected to a rotating sleeve 2, the rotating sleeve 2 passes through the bearing housing 16, and a nut 21 is fitted inside the end of the rotating sleeve 2, the nut 21 is connected to a lead screw 3 by internal thread, the other end of the lead screw 3 is connected to a support shaft 4, and clamping components 6 are symmetrically installed at both ends of the support shaft 4; The clamping assembly 6 includes a guide plate 61, a first hook 62, and a second hook 63. Guide plates 61 are installed on both sides of the housing 1. The first hook 62 and the second hook 63 are arranged crosswise, and the support shaft 4 passes through the intersection of the first hook 62 and the second hook 63 and is connected to the guide plate 61. One end of the first hook 62 is slidably disposed on the first guide channel 611 of the guide plate 61 and the first follower channel 11 of the housing 1, and the other end is equipped with a first hook head 621 for gripping the rail. One end of the second hook 63 is slidably disposed on the second guide channel 612 of the guide plate 61 and the second follower channel 12 of the housing 1, and the other end is equipped with a second hook head 631 for gripping the rail. The first guide channel 611 and the second guide channel 612 are inclined and symmetrically arranged, so that self-locking is achieved when the first hook 62 and the second hook 63 grip the rail.

[0029] In this lifting device, the housing 1 serves as the basic frame and protective carrier for the entire rail lifting device. It also isolates external dust, impurities, and impacts, protecting the internal transmission structure and preventing operators from directly contacting moving parts, thus improving safety. The base plate 15 is used to fix the bearing housing 16 and the motor 17, maintaining their preset relative positional relationship and ensuring the transmission connection accuracy between the output end of the motor 17 and the rotating sleeve 2. The bearing housing 16 houses the bearing structure of the shaft 14, providing radial and axial support for the rotating sleeve 2, limiting the radial runout of the rotating sleeve 2, improving power transmission efficiency, reducing the load on the motor 17, and ensuring its stable rotation only around its own axis. At the same time, in conjunction with the base plate 15, it fixes the axial position of the rotating sleeve 2, ensuring that the power output by the motor 17 can be accurately transmitted to the rotating sleeve 2, avoiding power loss.

[0030] Motor 17 receives commands from the control components, such as start, stop, and forward / reverse rotation, converting electrical energy into mechanical energy and driving the rotating sleeve 2 to rotate through its output end. By adjusting the speed and direction of rotation, the movement speed and direction of the subsequent transmission structure can be controlled, thereby realizing the clamping and releasing actions of the hook. Motor 17 replaces the manual operation or hydraulic drive of traditional lifting tools, realizing the automation of rail lifting, greatly improving operational efficiency, and avoiding the problem of unstable clamping caused by uneven force during manual operation. By precisely controlling the speed and direction of rotation, it can adapt to the lifting needs of rails of different specifications, solving the defects of hydraulic drive such as easy oil leakage, rail contamination, and fluctuation of clamping force.

[0031] One end of the rotating sleeve 2 is connected to the output end of the motor 17 for drive, receiving the rotational power transmitted by the motor 17. The other end is fitted with a nut 21 and drives the nut 21 to rotate synchronously. Supported by the bearing housing 16, it maintains stable rotation, ensuring that power is smoothly transmitted to the nut 21, avoiding the installation inconvenience caused by directly connecting the nut 21 to the output end of the motor 17. The nut 21 rotates synchronously with the rotating sleeve 2, forming a threaded transmission pair with the lead screw 3 through its internal threads, converting its rotational motion into the axial linear motion of the lead screw 3. Simultaneously, it bears the axial force transmitted by the lead screw 3 during transmission, ensuring that the power can effectively drive the support shaft 4 to move. The threaded transmission has the characteristics of high transmission accuracy and stable force transmission, ensuring the uniformity of the axial movement of the lead screw 3, thereby stabilizing the hook clamping force and avoiding the rail loosening problem caused by fluctuations in the clamping force of traditional lifting devices.

[0032] The lead screw 3 receives the power transmitted from the nut 21 and converts it into axial linear motion. Its other end is fixedly connected to the support shaft 4, transmitting the linear motion to the support shaft 4 and causing it to move axially. Simultaneously, it maintains thread engagement with the nut 21 during movement, ensuring uninterrupted power transmission. The rigid structure of the lead screw 3 can withstand the weight of the rail during hoisting, preventing clamping failure due to deformation under stress and ensuring the safety of the hoisting operation.

[0033] The support shaft 4 synchronously transmits the axial linear motion from the lead screw 3 to the clamping assemblies 6 on both sides, ensuring that the hooks on both sides move in unison. Simultaneously, it passes through the intersection of the first hook 62 and the second hook 63, serving as the fulcrum for the hook's rotation, allowing the hook to rotate around the support shaft 4 to achieve clamping and releasing actions. This also disperses the weight of the rail on the hook, improving the structure's load-bearing capacity. The first guide track 611 and the second guide track 612 on the guide plate 61 provide a preset motion trajectory for the hook, limiting its sliding direction and improving clamping accuracy. They also provide an installation base for auxiliary components such as the rail head guide plate 9 and the switch assembly 8, integrating the surrounding structure of the clamping assembly 6, reducing space occupation, and adapting to narrow working environments, such as rail replacement in tunnels.

[0034] The first hook 62 and the second hook 63 are slidably mounted at one end within the guide rail and follower rail via guide posts. They slide along the guide rail and open and close as the support shaft 4 moves. The first hook head 621 and the second hook head 631 at the other end are used to directly contact and grip the rail. The shape of the hook head is adapted to fit the rail head to ensure a firm grip. The cross arrangement and fulcrum structure make the opening and closing of the hooks less strenuous. Combined with the inclined design of the guide rail, the weight of the rail can be used to achieve self-locking when gripping the rail, eliminating the need for continuous power supply from the motor 17 and solving the safety hazard of slippage when the existing electric lifting tools are powered off. The fit between the hook head and the rail ensures a firm grip, preventing the rail from loosening during lifting and improving operational safety.

[0035] The first guide rail 611 and the second guide rail 612 provide sliding tracks for the first hook 62 and the second hook 63. By tilting at an angle (less than the friction angle between the hook and the guide rail), the component of the rail's weight after the hook grips the rail points inward along the inclined surface of the guide rail, achieving self-locking. Simultaneously, the symmetrical structure ensures synchronized movement of the hooks on both sides. Even in the event of a power outage, the hooks remain clamped, significantly improving lifting safety and overcoming the lack of self-locking in existing electric lifting devices. The symmetrical track ensures uniform clamping force on both hooks, preventing rail misalignment due to uneven force, improving lifting accuracy, and reducing friction and wear between the hooks and the guide rail, thus extending service life.

[0036] The first follower track 11 and the second follower track 12 have the same shape and overlapping path as the guide track of the guide plate 61, providing double constraints on the guide column of the hook. This further restricts the sliding direction of the hook and avoids the swaying caused by the guide column being constrained by only one side of the guide track. The double guide constraint makes the hook sliding more stable, reduces the radial force on the guide column, avoids bending or wear of the guide column, and extends the service life of the components. At the same time, it ensures that the hook trajectory is consistent throughout the opening and closing process, improves the reliability of the clamping action, and solves the hook swaying problem caused by the single guide of traditional lifting devices.

[0037] The motor-driven rail lifting device converts the electrical energy of the motor 17 into the mechanical action of the clamping assembly 6 through a power transmission chain consisting of the motor 17, rotating sleeve 2, nut 21, lead screw 3, and support shaft 4. It achieves automated gripping and self-locking of the rail by using cross-set hooks and inclined guide rails. At the same time, the integration of the box body 1, base plate 15, guide plate 61 and other structures ensures that all components work together and adapts to the rail lifting needs in rail transit, metallurgy and other scenarios.

[0038] In practical use, the first hook 62 and the second hook 63, which are cross-connected, act as grippers. When the motor 17 reverses, the rotating sleeve 2 drives the nut 21 to rotate, which in turn drives the lead screw 3 to move upward. The support shaft 4 then drives the grippers to move upward. The guide blocks installed on the upper part of the first hook 62 and the second hook 63 move upward through the corresponding guide channels and follower channels, causing the symmetrically arranged grippers to open. When the grippers need to grab the rail, the motor rotates forward, the rotating sleeve 2 drives the nut 21 to rotate, which in turn drives the lead screw 3 to move downward. At the same time, the guide blocks on the grippers move downward along the corresponding guide channels and follower channels, and the grippers clamp. When the lifting device lifts the rail off the ground, due to the difference in the force direction between the rail's own weight and the force direction on the grippers due to the guide channels and follower channels, the grippers cannot open, thus achieving a self-locking function and ensuring the safety of the rail during lifting.

[0039] Reference Figure 5 and Figure 6The first follower track 11 and the first guide track 611 have the same shape and overlap in path. The second follower track 12 and the second guide track 612 have the same shape and overlap in path. The first follower track 11, the second follower track 12, the first guide track 611 and the second guide track 612 are all set with elongated holes. The first follower track 11, the second follower track 12, the first guide track 611 and the second guide track 612 serve as the core trajectory constraints of the clamping component 6. Through the dual structure of the guide track main constraint and the follower track auxiliary constraint, a preset sliding trajectory that completely overlaps is provided for the first hook 62 and the second hook 63. The shape of the elongated hole is adapted to the complete opening and closing stroke of the hook. At the same time, through the inclined symmetrical layout, the axial movement of the support shaft 4 is accurately converted into the clamping action of the hook, and the structural basis is provided for the self-locking function, ensuring that the hooks on both sides synchronously, stably and accurately realize the rail gripping and clamping.

[0040] The double-track overlap eliminates the gap error of a single guide structure, avoids hook slippage and deviation, and ensures that the hook is accurately aligned with the rail during each lifting operation, improving the success rate and safety of lifting operations. It is suitable for the high requirements of rail installation accuracy in rail transit engineering. The uniform tilt angle (in conjunction with the friction angle condition) creates a synergistic self-locking effect, and the hook can stably self-lock after gripping the rail, completely solving the defect of easy slippage when the existing electric lifting tools are powered off. At the same time, it eliminates the need for continuous power output from motor 17, reducing energy consumption and motor 17 load, extending the service life of motor 17, and making it suitable for long-term continuous operation scenarios such as metallurgical and steel plants.

[0041] Reference Figures 4-6 The first hook 62 is provided with a first guide post 64 and a first locking element 641 at one end. The first guide post 64 passes through the first guide track 611, the first hook 62 and the first follower track 11 in sequence, and is provided with the first locking element 641 at its end. The first guide post 64 restricts the sliding movement of the first hook 62 within the double track formed by the first guide track 611 and the first follower track 11. At the same time, the first guide post 64 evenly distributes the guiding constraint reaction force of the first hook 62 during the sliding process, avoids deformation caused by local force concentration of the first hook 62, ensures that the first hook 62 always opens and closes stably around the support shaft 4, extends the service life of the first hook 62, adapts to the high-intensity operation requirements of heavy rail hoisting, and ensures the consistency of the first hook 62's movement during each hoisting, thus improving the clamping accuracy.

[0042] The first locking element 641, through threaded engagement (or snap-fit ​​connection) with the first guide post 64, forms an axial limit on the first guide post 64, preventing the first guide post 64 from dislodging from the first follower track 11 during the sliding of the first hook 62. At the same time, a certain installation gap is reserved to allow the first guide post 64 to slide flexibly within the track, avoiding jamming caused by excessive constraint. This is suitable for the operation scenarios of frequent start-stop and high-frequency opening and closing in rail transit engineering, and also facilitates later disassembly and maintenance, reducing maintenance costs.

[0043] The second hook 63 is equipped with a second guide post 65 and a second locking element 651 at one end. The second guide post 65 passes through the second guide track 612, the second hook 63, and the second follower track 12 in sequence, and is equipped with the second locking element 651 at its end. The second guide post 65 limits the sliding movement of the second hook 63 to the double track formed by the second guide track 612 and the second follower track 12; at the same time, it evenly distributes the guiding reaction force received by the second hook 63 during the opening and closing process to the guide plate 61 and the housing 1, avoiding bending deformation of the second hook 63 due to local force concentration, ensuring that the second hook 63 always stably achieves clamping and releasing actions around the support shaft 4, and keeps the action synchronized with the first hook 62, avoiding clamping failure due to force deformation, extending the service life of the components, and ensuring the consistency of the action of the second hook 63 during each lifting, improving the overall clamping accuracy, and adapting to the high requirements for rail installation accuracy in rail transit engineering.

[0044] The second locking element 651 is fixed to the second guide post 65 by threaded engagement (or snap-fit ​​connection), forming an axial limit on the second guide post 65 to prevent the second guide post 65 from coming out of the second follower track 12 during the sliding of the second hook 63. At the same time, a small installation gap is reserved to allow the second guide post 65 to slide flexibly within the track, avoiding motion jamming caused by excessive constraint, greatly improving the safety of hoisting operations, and adapting to heavy-load and high-risk operation scenarios such as metallurgical and steel plants.

[0045] Reference Figures 1-3 Guide shafts 5 are installed on both sides of the support shaft 4 with the axis of the lead screw 3 as the center line. The guide shafts 5 are parallel to the support shaft 4. The guide shafts 5 pass through the base plate 15 and are fitted with linear bearings 51, which are mounted on the base plate 15. One end of the guide shaft 5 is fixed to the support shaft 4, and the other end passes through the base plate 15 and cooperates with the linear bearing 51, forming a double radial constraint on the support shaft 4. By restricting the rotational freedom of the support shaft 4 through its own rigid structure, it ensures that the support shaft 4 only moves linearly along the axial direction, avoiding twisting or offset when the support shaft 4 drives the hook to move. At the same time, it cooperates with the support shaft 4 to form a three-point support structure, dispersing the radial force borne by the support shaft 4 and improving the load-bearing capacity of the overall transmission structure.

[0046] The inner ring of the linear bearing 51 mates with the guide shaft 5, providing a low-friction sliding channel for the guide shaft 5. Through its own rolling element structure (such as balls and needle rollers), the sliding friction between the guide shaft 5 and the bearing is converted into rolling friction, reducing the resistance when the guide shaft 5 moves. At the same time, it provides radial positioning for the guide shaft 5, limiting the radial runout of the guide shaft 5 and ensuring that the guide shaft 5 always moves along the axis of the linear bearing 51 and remains parallel to the support shaft 4. In addition, the sealing structure (such as a dust cover) can prevent external dust and impurities from entering the bearing, ensuring long-term operational stability.

[0047] The lifting device also includes a control component. A proximity switch 7 is mounted on the base plate 15, located on one side of the guide shaft 5. Switch assemblies 8 are mounted on both sides of the housing 1 near the clamping assembly 6. The control component is electrically connected to the proximity switch 7, switch assembly 8, and motor 17. The control component receives electrical signals transmitted by the proximity switch 7 and switch assembly 8 through a preset program. After analyzing and processing the signals, it outputs precise control commands to the motor 17, such as start, stop, forward / reverse rotation, and speed adjustment. It also has a fault monitoring function, which can detect the operating status of the motor 17 and whether the signal feedback from the proximity switch 7 and switch assembly 8 is normal in real time. If an abnormal signal occurs, such as the switch assembly 8 starting the clamping action without being triggered, a stop command is immediately issued and an alarm is triggered to avoid safety accidents caused by misoperation or component failure, thereby improving operational safety.

[0048] The proximity switch 7 monitors the axial position change of the guide shaft 5 in real time through electromagnetic induction or photoelectric induction. When the guide shaft 5 moves with the support shaft 4 to the preset position of clamping (guide shaft 5 close to proximity switch 7) or releasing (guide shaft 5 away from proximity switch 7), it immediately sends an electrical signal to the control component to provide feedback on the end point of the movement stroke of the support shaft 4. Through precise position detection, it ensures that each clamping action reaches the preset stroke, avoiding rail loosening due to insufficient clamping or component deformation (such as guide wear or hook bending) due to excessive clamping. The proximity switch 7 has non-contact detection characteristics, avoiding wear caused by direct friction with the guide shaft 5, ensuring long-term stable detection, and reducing the frequency of maintenance and replacement.

[0049] The switch assembly 8 is a rail contact detection unit. When the lifting device descends and approaches the rail, the triggering component of the switch assembly 8 (such as the rail contact plate 83) first contacts the rail surface and generates displacement, which in turn triggers the internal contact 84 to act and sends an electrical signal to the control assembly indicating that the rail has been contacted. If the lifting device does not contact the rail (such as due to alignment deviation), no signal is sent, and the control assembly prohibits the motor 17 from starting the clamping action. It also has a reset function. After the lifting device lifts the rail, the triggering component automatically resets to prepare for the next detection.

[0050] Reference Figure 1 and Figure 2The switch assembly 8 includes a switch base 81, which is mounted on the guide plate 61 on the side away from the first hook 62. A sliding pin 82 is connected to the bottom of the switch base 81, and a rail contact plate 83 is mounted on the bottom end of the sliding pin 82. The other end of the sliding pin 82 passes through the inner cavity of the switch base 81 and is connected to a contact 84, which is located inside the inner cavity. A return spring is sleeved on the outside of the sliding pin 82, with its two ends abutting against the bottom of the switch base 81 and the top of the rail contact plate 83, respectively. The switch base 81 serves as the basic mounting carrier and structural frame of the switch assembly 8. The inner cavity it opens into limits the range of motion of the contact 84, preventing the contact 84 from failing to trigger the signal due to displacement. The sliding pin 82 transmits the rail contact force received by the rail contact plate 83 to the contact 84, pushing the contact 84 to move within the inner cavity to trigger the signal. Simultaneously, after the external force disappears, the return spring causes the rail contact plate 83 and the contact 84 to reset, preparing for the next test. Its rigid structure ensures uninterrupted force transmission and no deformation.

[0051] The rail contact plate 83 is the direct contact component between the switch assembly 8 and the rail. Its bottom is shaped to fit the surface of the rail, ensuring a stable fit and preventing excessive localized stress due to insufficient contact area. Its structure evenly transmits the reaction force from the rail to the sliding pin 82, while preventing wear caused by direct contact between the sliding pin 82 and the rail, thus protecting the sliding pin 82. The contact 84 moves along the inner cavity under the push of the sliding pin 82. When it reaches a preset position, it contacts (or separates from) the conductive component inside the cavity, realizing the switching of the electrical signal. This converts the physical state of contact with the rail into an electrical signal recognizable by the control assembly. Its structure ensures reliable contact and no sparks during signal switching, avoiding signal interference.

[0052] The return spring is compressed when the rail contact plate 83 contacts the rail and drives the sliding pin 82 to move upward, storing elastic potential energy. When the lifting device lifts the rail and the rail contact plate 83 is separated from the rail, the elastic potential energy is released, pushing the rail contact plate 83 and the sliding pin 82 to move downward and reset, so that the contact 84 returns to the initial position, ensuring that the initial conditions of each test are consistent and improving the stability of the test accuracy.

[0053] A rail head guide plate 9 is installed between the guide plate 61 and the switch base 81. The rail head guide plate 9, through its arc or groove structure adapted to the shape of the rail head, forms an active guiding constraint on the rail head as the lifting device approaches the rail, guiding the rail head to accurately enter the clamping range of the first hook 62 and the second hook 63, avoiding the rail from deviating from the preset gripping position due to the alignment deviation of the lifting device. The rail head guide plate 9 is fixedly installed between the guide plate 61 and the switch base 81, which can fill the installation gap between the two, enhance the structural connection stability of the guide plate 61 and the switch base 81, and at the same time provide lateral protection for the sliding pin 82 and the rail contact plate 83 at the bottom of the switch base 81, reducing the direct adhesion of external impurities (such as rust and dust) to the core components of the switch assembly 8.

[0054] In addition, the rail head guide plate 9 can make contact with the rail head in advance and form a preliminary positioning during the descent of the lifting device, so that the rail contact plate 83 can be more accurately aligned with the contact point when it subsequently contacts the rail, avoiding unilateral force or tilting of the rail contact plate 83 due to misalignment, and ensuring the accuracy of the signal triggering of the switch assembly 8.

[0055] Handles 13 are provided at the top and bottom of the housing 1, and mounting shafts 14 are provided at both ends of the housing 1. The top handle 13 of the housing 1 is a gripping component for handling and assisting operation of the lifting device. The top handle 13 is symmetrically or centrally positioned to provide operators with a stable point of force application, which is convenient for short-distance handling before the lifting device is installed (such as moving it from the storage area to the side of the lifting equipment) or for fine-tuning the position during the installation process. At the same time, when the lifting device is maintained, the position of the housing 1 can be fixed by the top handle 13 to prevent the housing 1 from shaking during the maintenance process and affecting the operation, and to provide a stable working environment for the maintenance of internal components (such as motor 17 and lead screw 3).

[0056] The bottom handle 13 of the housing 1 provides a bottom force application point for the operator when the lifting device needs to be flipped or tilted for installation (such as to adapt to the interface of special lifting equipment), ensuring that the housing 1 is balanced in force during the flipping process and avoiding deformation of the housing 1 caused by unilateral force; at the same time, when the lifting device is placed on the ground, the bottom handle 13 can raise the gap between the bottom of the housing 1 and the ground, reducing the direct contact of ground moisture or impurities with the bottom of the housing 1, thus indirectly protecting the bottom structure of the housing 1.

[0057] The mounting shafts 14 at both ends of the housing 1 are adapted to the hooks or connecting seats of the lifting equipment through standardized shaft diameters and lengths, ensuring that the lifting device can be stably hung on the lifting equipment. At the same time, the rigid connection between the mounting shafts 14 and the housing 1 can evenly transmit the lifting force of the lifting equipment to the housing 1, and then distribute it to the internal transmission components and clamping rails through the housing 1, avoiding structural damage caused by localized force concentration. In addition, some mounting shafts 14 can be detachable or rotatable, which makes it easy to adjust the connection angle according to the interface of the lifting equipment and improves adaptability.

[0058] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor-driven rail lifting device, characterized in that: The device includes a housing (1), a base plate (15) is installed inside the housing (1), a bearing housing (16) and a motor (17) are installed on the base plate (15), the output end of the motor (17) is connected to a rotating sleeve (2), the rotating sleeve (2) passes through the bearing housing (16), and a nut (21) is fitted inside the end of the rotating sleeve (2), the nut (21) is threadedly connected to a lead screw (3), the other end of the lead screw (3) is connected to a support shaft (4), and clamping assemblies (6) are symmetrically installed at both ends of the support shaft (4); The clamping assembly (6) includes a guide plate (61), a first hook (62), and a second hook (63). The guide plate (61) is installed on both sides of the housing (1). The first hook (62) and the second hook (63) are arranged crosswise, and the support shaft (4) passes through the intersection of the first hook (62) and the second hook (63) and is connected to the guide plate (61). One end of the first hook (62) is slidably disposed on the first guide channel (611) of the guide plate (61) and the housing (63). 1) The first follower track (11) is equipped with a first hook (621) for gripping the rail at the other end. The second hook (63) is slidably disposed at one end on the second guide track (612) of the guide plate (61) and the second follower track (12) of the box (1), and is equipped with a second hook (631) for gripping the rail at the other end. The first guide track (611) and the second guide track (612) are inclined and symmetrically arranged. When the first hook (62) and the second hook (63) grip the rail, self-locking is achieved.

2. The motor-driven rail lifting device according to claim 1, characterized in that: The first follower channel (11) and the first guide channel (611) have the same shape and overlap in path. The second follower channel (12) and the second guide channel (612) have the same shape and overlap in path. The first follower channel (11), the second follower channel (12), the first guide channel (611) and the second guide channel (612) are all provided with elongated holes.

3. The motor-driven rail lifting device according to claim 1, characterized in that: The first hook (62) is provided with a first guide post (64) and a first locking member (641) at one end. The first guide post (64) passes through the first guide channel (611), the first hook (62) and the first follower channel (11) in sequence, and the first locking member (641) is provided at its end. The second hook (63) is provided with a second guide post (65) and a second locking member (651) at one end. The second guide post (65) passes through the second guide channel (612), the second hook (63) and the second follower channel (12) in sequence, and the second locking member (651) is provided at its end.

4. The motor-driven rail lifting device according to claim 1, characterized in that: Guide shafts (5) are installed on both sides of the support shaft (4) with the axis of the lead screw (3) as the center line. The guide shafts (5) are parallel to the support shaft (4). The guide shafts (5) pass through the substrate (15) and are fitted with linear bearings (51). The linear bearings (51) are installed on the substrate (15).

5. The motor-driven rail lifting device according to claim 4, characterized in that: It also includes a control component. A proximity switch (7) is mounted on the base plate (15). The proximity switch (7) is located on one side of the guide shaft (5). Switch components (8) are mounted on the side of the housing (1) near the clamping component (6). The control component is electrically connected to the proximity switch (7), the switch components (8) and the motor (17) respectively.

6. The motor-driven rail lifting device according to claim 5, characterized in that: The switch assembly (8) includes a switch base (81), which is mounted on the side of the guide plate (61) away from the first hook (62). A sliding pin (82) is connected to the bottom of the switch base (81), and a rail contact plate (83) is installed at the bottom end of the sliding pin (82). The other end of the sliding pin (82) passes through the inner cavity of the switch base (81) and is connected to a contact (84). The contact (84) is located in the inner cavity. A return spring is sleeved on the outside of the sliding pin (82), and the two ends of the return spring abut against the bottom of the switch base (81) and the top of the rail contact plate (83) respectively.

7. The motor-driven rail lifting device according to claim 6, characterized in that: A rail head guide plate (9) is installed between the guide plate (61) and the switch base (81).

8. The motor-driven rail lifting device according to claim 1, characterized in that: The box (1) is provided with handles (13) at the top and bottom, and mounting shafts (14) are provided at both ends of the box (1).

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