A lifting device for hoisting furnace rollers in an annealing furnace.

Abstract

This invention discloses a lifting device for hoisting furnace rollers in an annealing furnace, comprising a lifting plate, a furnace roller clamping unit, a spacing adjustment unit, and a furnace roller protection unit. The furnace roller clamping unit has two sets respectively positioned at both ends of the lifting plate along its length. The furnace roller clamping unit includes a clamping mechanism and a displacement mechanism. The clamping mechanism is used to clamp and fix the furnace roller. This invention, through the furnace roller protection unit, is linked with the displacement mechanism in the furnace roller clamping unit for control, eliminating the need for separate electrical control or manual operation. Relying on the lifting stroke itself, the half-body protective cover automatically closes for protection during lifting and automatically opens to avoid collisions during lowering. The half-body protective cover adopts a hollow cage-like fully enclosed protective structure, which can provide all-round anti-collision and anti-scratching protection for the entire length and outer perimeter of the furnace roller, avoiding damage to the furnace roller caused by foreign object impacts or equipment collisions during the lifting process.

Description

Technical Field

[0001] This invention belongs to the field of lifting tool technology, specifically relating to a lifting tool for lifting furnace rollers in an annealing furnace. Background Technology

[0002] Annealing furnace rollers are core precision functional components of annealing furnace equipment. The smoothness of their outer surface, the roundness of their dimensions, and the overall structural accuracy directly affect the flatness and forming quality of annealing steel plates, aluminum plates, and other sheet materials. They are key components for ensuring the yield rate of the annealing production line. In the entire process of mass production assembly of furnace rollers, regular equipment maintenance, fault replacement, and daily transfer and warehousing, special lifting tools are required to complete the stable lifting and handling of furnace rollers. The safety and non-destructive nature of the lifting operation are crucial to the service life of the furnace rollers and the stable operation of the production line.

[0003] A search revealed Chinese Patent Publication No. CN213738215U, which discloses a lifting device for replacing furnace rollers. This technical solution mainly consists of a left clamp, a right clamp, and a matching horizontal telescopic assembly. The distance between the left and right clamps is adjusted by the telescopic drive of the horizontal telescopic assembly to accommodate furnace rollers of different sizes for clamping and lifting. However, this lifting device relies solely on the clamping structures at both ends for single-point or partial clamping and fixing. The entire middle section and outer arc surface of the furnace roller are completely exposed and unprotected. In the complex lifting conditions of a factory, slight shaking, offset, and swaying are unavoidable during high-altitude lifting, alignment, and translation. The lack of protection in the lifting method can easily cause the furnace rollers to collide and scrape with surrounding equipment, frames, and workpieces. Since the furnace rollers of the annealing furnace are ultra-high precision components, scratches, dents, impact damage, and deformation defects are not allowed on their surface. The above-mentioned unprotected lifting method can easily cause indentations, scratches, and impact dents on the surface of the furnace rollers, directly damaging the surface smoothness and roundness accuracy of the furnace rollers. This can lead to quality defects such as indentations, scratches, and uneven annealing on the plate surface when the furnace rollers are used in subsequent applications. This seriously affects the yield rate of plate processing and significantly increases the cost of equipment maintenance and workpiece replacement. In order to avoid the above-mentioned technical problems, it is indeed necessary to provide a lifting device for lifting the furnace rollers of the annealing furnace to overcome the defects in the prior art. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a lifting device for lifting annealing furnace rolls. This lifting device is intended to solve the technical problem that the annealing furnace rolls lack protection on the outer surface of the rolls during lifting in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a lifting device for lifting furnace rollers of an annealing furnace, comprising:

[0006] Hanging platform;

[0007] The furnace roller clamping unit has two sets of clamping mechanisms respectively placed at both ends of the hanging plate along the length direction. The furnace roller clamping unit includes a clamping mechanism and a displacement mechanism. The clamping mechanism is used to clamp and fix the furnace roller, and the displacement mechanism allows the distance between the clamping mechanism and the hanging plate to be adjusted within a certain range.

[0008] A spacing adjustment unit, which is mounted on a hanging plate, is used to adjust the distance between the two sets of furnace roller clamping units;

[0009] A furnace roller protection unit is located below the hanging plate and between two sets of furnace roller clamping units. The furnace roller protection unit includes two sets of protective mechanisms arranged along the length of the hanging plate. Each set of protective mechanisms includes a mounting frame. A pair of half-body protective covers are rotatably connected to the bottom of the mounting frame. Each half-body protective cover includes several arc-shaped connecting plates evenly spaced along the length of the hanging plate. Several fixed protective rods evenly spaced along their arc-shaped trajectories are fixedly connected between the arc-shaped connecting plates. One end of each arc-shaped connecting plate is fixedly connected to the same drive shaft, which is rotatably connected to the mounting frame. A transmission assembly is provided between the pair of half-body protective covers and the clamping mechanisms. When the clamping mechanisms clamp and fix the furnace rollers and move them upwards, a displacement mechanism adjusts the distance between the clamping mechanisms and the hanging plate to the maximum. The transmission assembly is used to drive the pair of half-body protective covers from an open state to a closed state to protect the hoisted furnace rollers.

[0010] Preferably, the bottom of the hanging plate is provided with a mounting cavity, and the spacing adjustment unit includes a pair of movable plates slidably installed in the mounting cavity of the hanging plate. An avoidance groove is provided at one end of the pair of movable plates that are close to each other. A first gear is provided in the mounting cavity of the hanging plate and at the avoidance groove of the pair of movable plates. A first rack is fixedly connected in the avoidance groove of the pair of movable plates at the location of the first gear. The first rack meshes with the first gear.

[0011] Preferably, a drive shaft is fixedly connected to the center of the first gear, the drive shaft is rotatably connected to the hanging plate, the top end of the drive shaft extends to the top of the hanging plate and is fixedly connected to a worm gear, a worm is provided on one side of the worm gear to mesh with the worm gear, and the worm is fixedly installed to the hanging plate through a bearing seat.

[0012] Preferably, the clamping mechanism includes a mounting base, with clamping arms rotatably connected to both ends of the mounting base. An adjustment groove is formed along the length of each clamping arm. A pressure seat is provided between the two clamping arms. Both ends of the pressure seat have clamping grooves for accommodating the clamping arms. An adjustment shaft passing through the adjustment groove is fixedly connected within the clamping groove. A driving component is mounted on the top of the mounting base. The driving end of the driving component passes through the mounting base and is fixedly connected to the pressure seat. A connecting frame is fixedly connected to the top of the mounting base, outside the driving component.

[0013] Preferably, a first pressing member is fixedly connected to the inner side of the clamping end of the two clamping arms, and a second pressing member is fixedly connected to the center of the bottom of the pressing base. The first pressing member and the second pressing member are cylindrical.

[0014] Preferably, the displacement mechanism includes a guide rod fixedly connected to the top of the connecting frame, a guide sleeve fixedly connected to the guide rod on the moving plate, the guide rod being slidably installed inside the guide sleeve and its top end passing through the guide sleeve and fixedly connected to a limiting plate, and an elastic element being sleeved between the limiting plate and the moving plate and outside the guide rod.

[0015] Preferably, the mounting brackets in the two sets of protective mechanisms are respectively fixedly connected to two movable plates, and multiple telescopic protective rods are also provided between the two sets of protective mechanisms. The number of telescopic protective rods is the same as the number of fixed protective rods in each set of protective mechanisms. A receiving groove is provided at one end of the fixed protective rod near the telescopic protective rod, and the two ends of the telescopic protective rod are respectively slidably installed in the receiving grooves of the fixed protective rods in the two sets of protective mechanisms that are in opposite positions.

[0016] Preferably, the transmission assembly includes a second gear fixedly connected to the end of the transmission shaft away from the telescopic guard rod, two second gears in the same group of the protective mechanisms mesh with each other, and a third gear is also fixedly connected to the end of one of the transmission shafts of the protective mechanism away from the telescopic guard rod. A second rack is provided on one side of the third gear in the vertical direction, and the third gear meshes with the second rack. The second rack is fixedly connected to the connecting frame.

[0017] Preferably, a closing plate is fixedly connected to one end of several arc-shaped connecting plates in the semi-body protective cover away from the drive shaft. A protective pad is glued and fixed to one end of the closing plate. A sensor is installed on one of the closing plates of the protective mechanism. An electromagnet is installed at the top of the moving plate corresponding to the position of the limiting plate. The limiting plate is made of a magnetic material that attracts the electromagnet.

[0018] Preferably, each of the four corners at the top of the suspended platform is fixedly connected with a lifting ring.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention, through the setting of a worm gear and worm wheel, in conjunction with the spacing adjustment unit of the first gear and the first rack, can realize the synchronous and symmetrical spacing adjustment of two sets of furnace roller clamping units, which can adapt to the hoisting operation of annealing furnace rollers of different lengths. The clamping mechanism of the furnace roller clamping unit adopts a three-point clamping structure with double clamping arms and top pressure seat, combined with cylindrical first and second pressure members, to limit and clamp the furnace roller at multiple points, with uniform force and reliable positioning, which can effectively prevent the furnace roller from slipping, deviating and shaking during hoisting, and improve the overall stability of hoisting.

[0021] 2. This invention utilizes a furnace roller protection unit, which is linked to the displacement mechanism in the furnace roller clamping unit. No separate electrical control or manual operation is required. Relying on the lifting stroke itself, the half-body protective cover automatically closes during lifting and automatically opens to avoid impact during lowering. The half-body protective cover adopts a hollow cage-like fully enclosed protective structure, providing all-around anti-collision and anti-scratching protection for the entire length and outer perimeter of the furnace roller. This avoids damage to the furnace roller caused by foreign object impacts or equipment collisions during lifting, providing comprehensive and reliable protection. Furthermore, through the furnace... The telescopic protective rod in the roller protection unit, when the distance between the two sets of moving plates is adjusted by the spacing adjustment unit to adapt to different lengths of furnace rollers, the two moving plates drive the protective mechanisms fixed on them to move synchronously in opposite directions. During the relative movement of the two sets of protective mechanisms, the two ends of the telescopic protective rod slide synchronously along the receiving grooves of the fixed protective rods on both sides, matching the distance change of the two sets of protective mechanisms in real time, forming a full-coverage protection for the middle section of the furnace roller throughout the process, with no protective gaps. It can adapt in real time according to the distance adjustment changes of furnace rollers of different lengths, greatly improving the applicability of the lifting device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the furnace roller protection unit in the open state of the present invention;

[0023] Figure 2 This is a schematic diagram of the closed state structure of the furnace roller protection unit of the present invention;

[0024] Figure 3 This is a schematic diagram of the main structure of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the clamping mechanism in the furnace roller clamping unit of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the clamping mechanism in the furnace roller clamping unit of the present invention;

[0027] Figure 6 This is a first-view structural diagram of the movable plate, the first gear, and the first rack in the spacing adjustment unit of the present invention.

[0028] Figure 7 This is a second-view structural diagram of the movable plate, the first gear, and the first rack in the spacing adjustment unit of the present invention.

[0029] Figure 8 This is a schematic diagram of the drive shaft, worm gear, and worm structure in the pitch adjustment unit of the present invention;

[0030] Figure 9 This is a schematic diagram of the displacement mechanism in the furnace roller clamping unit of the present invention;

[0031] Figure 10 This is a side view of the structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the furnace roller protection unit structure of the present invention;

[0033] Figure 12 This is a schematic diagram of the half-body protective cover structure in the furnace roller protection unit of the present invention;

[0034] Figure 13 for Figure 11 Enlarged structural diagram at point A in the diagram;

[0035] Figure 14 for Figure 3 A magnified structural diagram at point B in the diagram.

[0036] The labels in the attached diagram are:

[0037] 1. Hanging plate; 2. Furnace roller clamping unit; 201. Mounting base; 202. Clamping arm; 2021. Adjusting groove; 203. Pressure seat; 204. Adjusting shaft; 205. Driving component; 206. First pressing component; 207. Second pressing component; 208. Connecting frame; 209. Guide sleeve; 210. Guide rod; 211. Limiting plate; 212. Elastic component; 3. Spacing adjustment unit; 301. Moving plate; 302. First gear; 30 3. First rack; 304. Drive shaft; 305. Worm gear; 306. Worm; 4. Furnace roller protection unit; 401. Mounting bracket; 402. Half-body protective cover; 4021. Arc-shaped connecting plate; 4022. Fixed protective rod; 4023. Transmission shaft; 4024. Closing plate; 403. Telescopic protective rod; 404. Second gear; 405. Third gear; 406. Second rack; 5. Electromagnet; 6. Sensor; 7. Lifting ring. Detailed Implementation

[0038] This specific embodiment is a lifting device for hoisting furnace rollers in an annealing furnace, and its structural schematic diagram is shown below. Figures 1-14As shown, the lifting device for hoisting the furnace rollers of an annealing furnace includes a lifting plate 1, a furnace roller clamping unit 2, a spacing adjustment unit 3, and a furnace roller protection unit 4. Two sets of furnace roller clamping units 2 are respectively positioned at both ends of the lifting plate 1 along its length. The spacing adjustment unit 3 is located on the lifting plate 1 and is used to adjust the distance between the two sets of furnace roller clamping units 2. The furnace roller protection unit 4 is located below the lifting plate 1 and between the two sets of furnace roller clamping units 2. Based on the actual length of the furnace rollers to be hoisted, the spacing adjustment unit 3 is operated to move the two sets of furnace roller clamping units 2 at both ends of the lifting plate 1 synchronously, adjusting the distance between them to match the furnace roller clamping points. The entire lifting device is then moved above the furnace rollers, and the two sets of furnace roller clamping units 2 are manipulated to lift the rollers from both ends. The furnace roller is reliably clamped and fixed. The lifting equipment drives the lifting plate 1 to rise, and the furnace roller is raised synchronously with the furnace roller clamping unit 2. The furnace roller protection unit 4 below the lifting plate is located between the two sets of clamping units, forming a protective enclosure for the furnace roller body. It accompanies the entire lifting operation. After the furnace roller is lifted to the designated position, the lifting device is lowered, and the clamping state of the furnace roller clamping unit 2 is released, completing a single lifting operation. The spacing between the two sets of furnace roller clamping units 2 can be flexibly changed through the spacing adjustment unit 3, which can adapt to annealing furnace rollers of different specifications and lengths, and has a wide range of applications. The furnace roller protection unit 4 is arranged between the two sets of furnace roller clamping units 2, facing the furnace roller body, which can effectively avoid collision and scratch damage to the furnace roller during lifting, and has a good protective effect on the furnace roller.

[0039] In this embodiment, as Figure 1 As shown, lifting rings 7 are fixedly connected to the four corners of the top of the lifting plate 1. Before the furnace roller hoisting operation, the hooks, wire ropes or slings of the hoisting equipment are respectively attached to the lifting rings 7 to complete the stable connection between the hoisting equipment and the hoisting equipment. When the hoisting equipment is lifted, the hoisting load is evenly transferred to the entire lifting plate 1 through the four lifting rings 7, so that the lifting plate is stably stressed, which drives the spacing adjustment unit 3, the furnace roller clamping unit 2 and the protection unit 4 below to be lifted synchronously, thereby realizing the overall hoisting and transfer of the furnace roller.

[0040] In this embodiment, as Figure 6 , Figure 7 and Figure 8As shown, the bottom of the hanging plate 1 is provided with an installation cavity, and the two ends and bottom of the installation cavity penetrate the hanging plate 1. The spacing adjustment unit 3 includes a pair of movable plates 301 slidably installed in the installation cavity of the hanging plate 1. Two sets of furnace roller clamping units 2 are respectively installed at the ends of the two movable plates 301 that are far apart. The ends of the pair of movable plates 301 that are close to each other are provided with a clearance groove. A first gear 302 is provided in the installation cavity of the hanging plate 1 and located at the clearance groove of the pair of movable plates 301. The first gear 302 is located in the clearance groove of the pair of movable plates 301. Two first racks 303 are fixedly connected at both locations. The first racks 303 mesh with the first gear 302. A drive shaft 304 is fixedly connected to the center of the first gear 302. The drive shaft 304 is rotatably connected to the hanging plate 1. The top of the drive shaft 304 extends to the top of the hanging plate 1 and is fixedly connected to a worm gear 305. A worm 306 is provided on one side of the worm gear 305 to mesh with and drive the worm gear 305. The worm 306 is fixedly installed on the hanging plate 1 through a bearing seat. According to the actual length of the furnace roller of the annealing furnace to be hoisted, the workers... The worm gear 306 operates from the top of the suspended platform. The worm gear 306 rotates stably via a bearing seat, allowing for forward or reverse rotation to provide power for subsequent spacing adjustments. When the worm gear 306 rotates, it drives the worm wheel 305 to rotate synchronously through meshing. The worm wheel 305 is fixed to the top of the drive shaft 304, thereby driving the drive shaft 304 and the first gear 302 fixed at the bottom to rotate coaxially. During the rotation of the first gear 302, it simultaneously meshes with the first rack 303 in the clearance grooves of the two side moving plates 301, driving a pair of... The movable plates 301 slide synchronously towards each other or in opposite directions within the mounting cavity of the hanging plate 1, thereby precisely adjusting the distance between the two movable plates 301 and the corresponding two sets of furnace roller clamping units 2. When the distance between the two sets of furnace roller clamping units 2 is adjusted to a suitable position to match the length of the furnace roller, the rotation of the worm gear 306 is stopped. Utilizing the reverse self-locking characteristic of the worm gear, the rotation state of the worm wheel 305, the drive shaft 304, and the first gear 302 is locked, so that the movable plates 301 are fixed in the current position and the distance no longer shifts, thus completing the distance adjustment and positioning operation.

[0041] In a preferred embodiment of this invention, a handwheel may be provided at one end of the worm gear 306, and the worm gear 306 may be driven to rotate by rotating the handwheel. In other embodiments, a servo motor or other device may also be mounted at one end of the worm gear 306 to achieve electric rotation.

[0042] As a preferred embodiment of this example, the outer sides of the worm gear 305 and the worm 306 are provided with protective covers, which are fixedly connected to the hanging plate 1 by bolts to protect the worm gear transmission components.

[0043] In this embodiment, as Figure 4 and Figure 5As shown, the furnace roller clamping unit 2 includes a clamping mechanism for clamping and fixing the furnace roller. The clamping mechanism includes a mounting base 201, with clamping arms 202 rotatably connected to both ends of the mounting base 201. An adjustment groove 2021 is formed along the length of each clamping arm 202. A pressure seat 203 is provided between the two clamping arms 202. Both ends of the pressure seat 203 have clamping grooves for accommodating the clamping arms 202. The clamping arms 202 are placed within the clamping grooves of the pressure seat 203. An adjustment shaft 204, passing through the adjustment groove 2021, is fixedly connected within the clamping groove. Both ends of the adjustment shaft 204 are fixedly connected to the pressure seat 203. A [missing information - likely a device or component] is mounted on the top of the mounting base 201. The driving component 205 has its driving end passing through the mounting base 201 and fixedly connected to the pressure seat 203. A connecting frame 208 is fixedly connected to the top of the mounting base 201 and outside the driving component 205. The position of the lifting device is adjusted to align the furnace roller clamping unit 2 with the furnace roller, so that the two clamping arms 202 of the furnace roller clamping unit 2 are placed outside the furnace roller. Then, the driving component 205 at the top of the mounting base 201 is activated. The driving component 205 can be a hydraulic cylinder, electric push rod, etc. The driving end of the driving component 205 extends downward, driving the pressure seat 203 fixedly connected at the bottom to move downward as a whole. During the downward movement of the pressure seat 203, the clamping grooves at both ends are fixed. The adjustable shaft 204 can slide relative to the adjusting groove 2021 of the clamping arm 202. Utilizing the limiting and guiding cooperation between the adjustable shaft 204 and the adjusting groove 2021, the clamping arms 202 on both sides are pushed to rotate inward around the connection point of the mounting base 201 and retract, so that the two sets of clamping arms 202 synchronously adhere to the outer wall of the furnace roller. As the pressure seat 203 continues to move downward, the clamping arms 202 on both sides gradually tighten, eventually clamping the furnace roller from both sides. Combined with the limiting and pressing action of the pressure seat 203, this achieves a stable clamping and fixing of the annealing furnace roller, ensuring that the furnace roller does not slip or shift during hoisting. After the furnace roller is hoisted to the designated position and completed its placement, the drive component 205 is controlled to move upward. The retraction causes the pressure seat 203 to move upward and reset. The adjusting shaft 204 slides in the opposite direction along the adjusting groove 2021, pulling the clamping arms 202 on both sides to open outward, releasing the clamping limit on the furnace roller. This completes the separation of the lifting device from the furnace roller and the material removal. Through the sliding cooperation of the pressure seat 203, the adjusting shaft 204 and the adjusting groove 2021, the vertical linear motion of the pressure seat 203 is converted into the rotational clamping motion of the clamping arms 202. The transmission structure is simple, the action is highly synchronized, and the opening and closing angles of the clamping arms 202 on both sides are consistent, which can ensure that the furnace roller is clamped in the center, effectively avoid unilateral clamping deviation, improve the stability of lifting, and is suitable for clamping and fixing furnace rollers of different sizes and specifications.

[0044] In this embodiment, a first pressing member 206 is fixedly connected to the inner side of the clamping end of the two clamping arms 202. The first pressing member 206 is welded and fixed to the clamping arm 202. A second pressing member 207 is fixedly connected to the center of the bottom of the pressure seat 203. The second pressing member 207 is welded and fixed to the pressure seat 203. The first pressing member 206 and the second pressing member 207 are cylindrical. The first pressing member 206 on the inner side of the two clamping arms 202 and the second pressing member 207 at the bottom of the pressure seat 203 cooperate with each other to form a symmetrical three-point clamping structure, which limits and clamps the furnace roller at multiple points. The force is uniform and the positioning is reliable. It can effectively prevent the furnace roller from slipping, shifting and shaking during the hoisting process, and improve the overall stability of the hoisting. The cylindrical pressing member can adaptively fit the cylindrical surface of the furnace roller of different sizes and specifications, automatically find the fitting position, and will not have local jamming or point contact stress concentration. It has good adaptability and higher clamping fit.

[0045] In this embodiment, as Figure 9 As shown, the furnace roller clamping unit 2 also includes a displacement mechanism, which allows the distance between the clamping mechanism and the hanging plate 1 to be adjusted within a certain range. The displacement mechanism includes a guide rod 210 fixedly connected to the top of the connecting frame 208. A guide sleeve 209 is fixedly connected to the moving plate 301 at the guide rod 210. The guide rod 210 is slidably installed in the guide sleeve 209 and its top end passes through the guide sleeve 209 and is fixedly connected to a limiting plate 211. An elastic element 212 is sleeved between the limiting plate 211 and the moving plate 301 and outside the guide rod 210. The elastic element 212 is preferably a screw. When the lifting device is lowered as a whole and the clamping mechanism is not in contact with the furnace roller, the limiting plate 211 is lifted by the elastic pushing action of the elastic element 212, and the guide rod 210 slides upward relative to the guide sleeve 209. The clamping mechanism is in a high position. At this time, the distance between the clamping mechanism and the hanging plate 1 is the smallest. After the clamping mechanism clamps the furnace roller, it is lifted upward by the lifting equipment. The weight of the furnace roller itself drives the clamping mechanism and the guide rod 210 to move downward as a whole. At this time, the elastic element 212 is compressed, and the distance between the clamping mechanism and the hanging plate 1 is the largest, so that the hanging plate 1 moves upward relative to the clamping mechanism.

[0046] As a preferred embodiment of this example, multiple sets of guide rods 210 and guide sleeves 209 may be provided to ensure the stability of the clamping mechanism during movement and prevent deflection. In this example, two sets of guide rods 210 and guide sleeves 209 are preferred.

[0047] In this embodiment, as Figure 11 and Figure 12As shown, the furnace roller protection unit 4 includes two sets of protection mechanisms arranged along the length of the hanging plate 1. Each set of protection mechanisms includes a mounting frame 401. A pair of half-body protective covers 402 are rotatably connected to the bottom end of the mounting frame 401. The half-body protective cover 402 includes several arc-shaped connecting plates 4021 arranged at equal intervals along the length of the hanging plate 1. Several fixed protective rods 4022, evenly distributed along their arc trajectory, are fixedly connected between the arc-shaped connecting plates 4021. One end of the arc-shaped connecting plates 4021 is fixedly connected to the same drive shaft 4023. The drive shaft 4023 is rotatably connected to the mounting frame 401. A transmission mechanism is provided between the pair of half-body protective covers 402 and the clamping mechanism. When the clamping mechanism clamps and fixes the furnace roller and moves it upward, the displacement mechanism adjusts the distance between the clamping mechanism and the lifting plate 1 to the maximum. The transmission component drives a pair of half-body protective covers 402 from an open state to a closed state to protect the hoisted furnace roller. When the lifting device is lowered and not in operation, the distance between the clamping mechanism and the lifting plate 1 is at its minimum, the transmission component is not triggered, and a pair of half-body protective covers 402 in the two sets of protective mechanisms remain open outward, without obstruction or interference, facilitating smooth alignment and clamping of the furnace roller by the clamping mechanism. After the clamping mechanism clamps the furnace roller, the lifting equipment begins to lift. Relying on the guiding sliding and elastic compression of the displacement mechanism, the lifting plate 1 moves upward relative to the clamping mechanism, so that the clamping mechanism and the furnace roller are properly aligned. The spacing between the hanging plates 1 is adjusted to the maximum stroke position to provide accurate linkage stroke for the closing of the protective cover. During the upward movement of the hanging plates 1, the coordinated transmission components move synchronously, driving the transmission shaft 4023 of the half-body protective cover 402 to rotate relative to the mounting frame 401. This causes the pair of half-body protective covers 402 that are open on both sides to flip inward and retract synchronously. The cage-like protective structure composed of multiple sets of equally spaced arc-shaped connecting plates 4021 and fixed protective rods 4022 closes synchronously, completely covering the outside of the furnace roller in the hoisting state. This ensures that the half-body protective cover 402 remains closed during the hoisting process, forming a protective enclosure for the entire furnace roller and effectively isolating it from external foreign objects and the risk of collision. After the furnace roller is lowered into position and unloaded, the displacement machine... The structure elastically resets, the distance between the clamping mechanism and the lifting plate 1 shrinks, and the transmission shaft 4023 rotates in the reverse direction through the transmission component, causing the two half-body protective covers 402 to reopen, removing the protective shield, facilitating the unloading of the furnace roller and the disengagement of the lifting device. The furnace roller protection unit 4 does not require separate electrical control or manual operation. It relies on the automatic linkage of the lifting stroke and displacement mechanism to achieve adaptive protection that closes when lifted and opens when placed, greatly improving the degree of automation of the operation and making it highly practical. The half-body protective cover 402 forms a hollow cage-like protective structure. After closing, it can wrap and protect the outer periphery of the furnace roller in all directions, effectively preventing collisions, scratches, and foreign object impacts during lifting and transportation, and protecting the surface of the high-precision furnace roller in all directions.

[0048] In this embodiment, as Figure 11 , Figure 13 and Figure 14 As shown, the transmission assembly includes a second gear 404 fixedly connected to the end of the transmission shaft 4023 away from the telescopic protective rod 403. Two second gears 404 in the same protective mechanism mesh with each other. A third gear 405 is also fixedly connected to the end of one of the transmission shafts 4023 of the protective mechanism away from the telescopic protective rod 403. A second rack 406 is arranged vertically on one side of the third gear 405. The third gear 405 meshes with the second rack 406. The second rack 406 is fixedly connected to the connecting frame 208. When the lifting device clamps the furnace roller and starts lifting, the displacement mechanism causes the lifting plate 1 to move upward relative to the clamping mechanism. The hanging plate 1 drives the furnace roller protection unit 4 to move upward synchronously, causing the third gear 405 to mesh and rotate with the second rack 406. The third gear 405 drives the corresponding transmission shaft 4023 to rotate synchronously, converting the vertical linear motion into the rotational motion of the transmission shaft 4023. The second gears 404 at the ends of the two transmission shafts 4023 in the same protection mechanism mesh with each other. While one transmission shaft 4023 rotates, the meshing of the second gear 404 drives the other transmission shaft 4023 to rotate synchronously in the opposite direction, so that the symmetrically arranged half-body protective covers 402 on both sides can synchronously flip inward and close, thus achieving the protection of the furnace roller.

[0049] In this embodiment, as Figure 11 and Figure 12 As shown, the mounting brackets 401 in the two sets of protective mechanisms are respectively fixedly connected to two movable plates 301. Multiple telescopic protective rods 403 are also provided between the two sets of protective mechanisms. The number of telescopic protective rods 403 is the same as the number of fixed protective rods 4022 in each set of protective mechanisms. A receiving groove is provided at one end of the fixed protective rod 4022 near the telescopic protective rod 403. The two ends of the telescopic protective rod 403 are slidably installed in the receiving grooves of the fixed protective rods 4022 in the two sets of protective mechanisms that are positioned opposite each other. When the distance between the two sets of movable plates 301 is adjusted by the distance adjustment unit 3 to accommodate furnace rollers of different lengths, the two movable plates 301 drive the protective mechanisms fixed on them to move synchronously in opposite directions. During the relative movement of the two sets of protective mechanisms, the telescopic... The two ends of the protective rod 403 slide synchronously inside the receiving grooves of the fixed protective rods 4022 on both sides. When the distance between the moving plates 301 increases, the telescopic protective rod 403 extends outward to compensate for the distance. When the distance between the moving plates 301 decreases, the telescopic protective rod 403 retracts and is stored in the receiving groove of the fixed protective rod 4022. It matches the distance change of the two sets of protective mechanisms in real time. No matter how the distance between the protective mechanisms is adjusted, the multiple sets of one-to-one corresponding telescopic protective rods 403 and fixed protective rods 4022 always form a complete whole protective fence structure. During the subsequent closing and hoisting process of the half-body protective cover 402, it forms a full-coverage protection for the middle section of the furnace roller, with no protective gaps. It can adapt in real time according to the distance adjustment of furnace rollers of different lengths, greatly improving the applicability of the lifting device.

[0050] As a preferred embodiment of this example, a limiting groove is provided axially in the receiving groove of the telescopic protective rod 403, and a limiting block is provided at the end of the telescopic protective rod 403 in the limiting groove. When the telescopic protective rod 403 is extended or retracted in the receiving groove, the limiting block moves in the limiting groove to prevent the telescopic protective rod 403 from falling out of the receiving groove.

[0051] As a preferred embodiment of this example, Figure 12 As shown, several arc-shaped connecting plates 4021 in the half-body protective cover 402 are fixedly connected to a closing plate 4024 at the ends away from the drive shaft 4023. A protective pad is glued to one end of the closing plate 4024. The closing plate 4024 enables the end faces of the two half-body protective covers 402 to be aligned and fitted together when closed. The protective pad ensures that the two half-body protective covers 402 make flexible contact when closed and joined, avoiding vibration and noise caused by hard metal impact and improving service life.

[0052] In this embodiment, as Figure 9 and Figure 12 As shown, a sensor 6 is installed on one of the closing plates 4024 of the protective mechanism. The sensor 6 is preferably a contact sensor. An electromagnet 5 is installed at the top of the moving plate 301 corresponding to the position of the limiting plate 211. The sensor 6 and the electromagnet 5 are electrically connected to the external controller of the lifting device. The limiting plate 211 is made of a magnetic material that attracts the electromagnet 5. After the half-body protective cover 402 is fully closed, the contact sensor 6 installed on the closing plate 4024 is triggered, detecting the signal that the protective cover is fully closed in real time, and transmitting the detection signal to the external controller. The external controller receives the sensor signal. After the arrival signal of device 6, the electromagnet 5 on the top of the control moving plate 301 is energized to generate magnetism. The electromagnet 5 attracts the corresponding magnetic material limiting plate 211, so that the limiting plate 211 is firmly attached and fixed, locking the position of the hanging plate 1 to prevent the furnace roller clamping unit 2 and the furnace roller protection unit 4 from shaking during the hoisting process, and to prevent the furnace roller protection unit 4 from rebounding and opening. When the furnace roller is hoisted to the designated position and unloaded, the external controller controls the electromagnet 5 to be de-energized and demagnetized, releasing the attraction and locking of the limiting plate 211. Under the action of the displacement mechanism, the hanging plate 1 is reset, and the protective cover opens synchronously.

[0053] It should be noted that the diameter of the complete protective cover formed by the closing of a pair of half-body protective covers 402 is larger than the diameter of the furnace roller to be hoisted. Even after the half-body protective cover 402 has moved a certain distance with the hoisting plate 1, the half-body protective cover 402 will not come into contact with or collide with the furnace roller, thus effectively protecting the furnace roller.

[0054] The control method of the present invention is controlled by an external controller of the lifting device used for hoisting the furnace rollers of the annealing furnace. The drive component 205, the sensor 6 and the electromagnet 5 are all electrically connected to the external controller. The control program of the controller can be implemented by those skilled in the art through simple programming. Therefore, the control method and circuit connection will not be explained in detail in the present invention.

[0055] Working principle: Before operation, based on the actual length of the furnace rollers to be hoisted into the annealing furnace, the operator drives the worm gear 306 to rotate. The meshing transmission between the worm gear 306 and the worm wheel 305 drives the bottom drive shaft 304 and the first gear 302 to rotate synchronously. The first gear 302, through the first racks 303 on both sides, synchronously drives two moving plates 301 to slide in opposite directions within the mounting cavity at the bottom of the hoisting plate 1, precisely adjusting the distance between the two sets of furnace roller clamping units 2 to ensure the clamping position precisely matches the clamping points at both ends of the furnace rollers. After adjustment, relying on the reverse rotation of the worm gear... The locking characteristic locks the transmission structure to ensure that the spacing will not shift during the hoisting process. The hooks and wire ropes of the hoisting equipment are attached to the lifting rings 7 at the four corners of the top of the hoisting plate 1, completing the stable connection between the hoisting device and the hoisting equipment. This allows the hoisting plate 1 to be evenly stressed as a whole, providing a stable force foundation for subsequent hoisting and transportation. At this time, the hoisting device is in the initial state. Under the pushing action of the elastic element 212, the distance between the clamping mechanism in the furnace roller clamping unit 2 and the hoisting plate 1 is the smallest. The half-body protective covers 402 of the two sets of protective mechanisms in the furnace roller protection unit remain open, without obstruction or interference.

[0056] Then, the lifting equipment is operated to move the entire lifting device to directly above the furnace roller to be lifted, so that the clamping arms 202 of the clamping mechanism in the two furnace roller clamping units 2 are aligned with the outer position of the furnace roller. Then, the drive unit 205 is activated, and the drive unit 205 pushes the pressure seat 203 to move vertically downward. The adjusting shafts 204 at both ends of the pressure seat 203 slide relative to each other along the adjusting grooves 2021 of the clamping arms 202, converting the vertical downward movement into the rotation and retraction action of the clamping arms 202. The two clamping arms 202 on both sides rotate inward synchronously to hug the furnace roller. The first cylindrical pressing member 206 on the inner side of the clamping arm 202 and the second cylindrical pressing member 207 at the bottom of the pressure seat 203 form a three-point fitting clamp, which adapts to the outer surface of the furnace roller and firmly clamps the furnace roller, ensuring that the furnace roller is clamped in the center without sliding or offset.

[0057] After the furnace roller is clamped, the lifting equipment begins to lift it upwards. The weight of the furnace roller causes the clamping mechanism and guide rod 210 to move downwards relative to the lifting plate 1, compressing the elastic element 212. The clamping mechanism and the lifting plate 1 expand until the limit plate 211 abuts against the electromagnet 5, reaching its maximum stroke. During this process, the lifting plate 1 moves upwards relative to the clamping mechanism, which in turn drives the furnace roller protection unit 4 to move upwards synchronously. This causes the third gear 405 to mesh and rotate with the second rack 406. The third gear 405 drives the corresponding transmission shaft 4023 to rotate synchronously, converting the vertical linear motion into the transmission shaft 4023. The rotational motion of 23, through the meshing of the second gears 404 at the ends of the two transmission shafts 4023 in the same protective mechanism, while one transmission shaft 4023 rotates, the meshing of the second gear 404 drives the other transmission shaft 4023 to rotate synchronously in the opposite direction, so that the symmetrically arranged half-body protective covers 402 on both sides can synchronously flip inward and close. At the same time, the protective mechanism is adjusted synchronously with the moving plate 301, and the telescopic protective rod 403 extends and retracts in real time to compensate for the gap, and cooperates with the fixed protective rod 4022 to form a complete cage-like protective structure, which fully wraps the outer periphery of the furnace roller and eliminates the blind spot of protection.

[0058] When the half-body protective cover 402 is fully closed, the contact sensor 6 on the closing plate 4024 is triggered, transmitting a closing signal to the external controller. After receiving the signal, the controller controls the electromagnet 5 to be energized to generate magnetism, which attracts the magnetic limiting plate 211 upwards, making the limiting plate 211 firmly attached and fixed, locking the position of the lifting plate 1 to prevent the furnace roller clamping unit 2 and the furnace roller protection unit 4 from shaking during the hoisting process, and to prevent the furnace roller protection unit 4 from rebounding and opening. This ensures that the furnace roller protection unit 4 is stable and reliable throughout the hoisting process. During the entire process of high-altitude transfer and alignment of the furnace roller, the electromagnet 5 is continuously energized and locked, and the furnace roller protection unit 4 always remains closed, providing all-round anti-collision and anti-scratching protection for the surface of the furnace roller, preventing the furnace roller from bumping or scratching with foreign objects, and ensuring the surface quality and structural accuracy of the high-precision furnace roller.

[0059] Once the furnace roller is hoisted to the designated installation position and placed on the support, the load on the furnace roller disappears. The external controller de-energizes the electromagnet 5, releasing the attraction and locking of the limit plate 211. At this time, the elastic element 212 rebounds and resets, pushing the lifting plate 1 downward. The distance between the clamping mechanism and the lifting plate 1 returns to its minimum state. Simultaneously, the third gear 405 meshes with the second rack 406 and moves downward, driving the second gear 404 and the transmission shaft 4023 to reverse. This causes the two side half-body protective covers 402 to automatically open outward, releasing the protection of the furnace roller. The control drive element 205 retracts and resets, driving the pressure seat 203 upward, causing the two side clamping arms 202 to open outward, releasing the clamping limit on the furnace roller. The lifting equipment is then operated to remove the lifting device, thus completing one complete annealing furnace roller hoisting operation. The lifting device returns to its initial state, and the next hoisting cycle can begin.

[0060] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A lifting device for hoisting furnace rollers in an annealing furnace, characterized in that, include: Hanging board (1); The furnace roller clamping unit (2) is provided with two sets of clamping mechanisms and displacement mechanisms respectively placed at both ends of the hanging plate (1) along the length direction. The clamping mechanism is used to clamp and fix the furnace roller, and the displacement mechanism allows the distance between the clamping mechanism and the hanging plate (1) to be adjusted within a certain range. A spacing adjustment unit (3) is provided on a hanging plate (1) for adjusting the distance between two sets of furnace roller clamping units (2); A furnace roller protection unit (4) is located below the hanging plate (1) and between two sets of furnace roller clamping units (2). The furnace roller protection unit (4) includes two sets of protection mechanisms arranged along the length of the hanging plate (1). Each set of protection mechanisms includes a mounting frame (401). The bottom end of the mounting frame (401) is rotatably connected to a pair of half-body protective covers (402). The half-body protective covers (402) include several arc-shaped connecting plates (4021) arranged at equal intervals along the length of the hanging plate (1). The several arc-shaped connecting plates (4021) are fixedly connected with equal intervals along their arc trajectory. Multiple fixed protective rods (4022) of the cloth, and several arc-shaped connecting plates (4021) are fixedly connected to the same drive shaft (4023) at one end. The drive shaft (4023) is rotatably connected to the mounting frame (401). A pair of half-body protective covers (402) and a transmission component are provided between the half-body protective covers (402) and the clamping mechanism. When the clamping mechanism clamps the fixed furnace roller and lifts it upward, the distance between the clamping mechanism and the hanging plate (1) is adjusted to the maximum through the displacement mechanism. The transmission component is used to drive the pair of half-body protective covers (402) from the open state to the closed state to protect the lifted furnace roller.

2. The lifting device for hoisting furnace rollers in an annealing furnace according to claim 1, characterized in that, The bottom of the hanging plate (1) is provided with an installation cavity. The spacing adjustment unit (3) includes a pair of movable plates (301) that are slidably installed in the installation cavity of the hanging plate (1). A clearance groove is provided at one end of the pair of movable plates (301) that are close to each other. A first gear (302) is provided in the installation cavity of the hanging plate (1) and at the clearance groove of the pair of movable plates (301). A first rack (303) is fixedly connected in the clearance groove of the pair of movable plates (301) at the location of the first gear (302). The first rack (303) meshes with the first gear (302).

3. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 2, characterized in that, A drive shaft (304) is fixedly connected to the center of the first gear (302). The drive shaft (304) is rotatably connected to the hanging plate (1). The top end of the drive shaft (304) extends to the top of the hanging plate (1) and is fixedly connected to a worm gear (305). A worm (306) is provided on one side of the worm gear (305) to mesh with the worm gear (305). The worm (306) is fixedly installed to the hanging plate (1) through a bearing seat.

4. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 2, characterized in that, The clamping mechanism includes a mounting base (201), with clamping arms (202) rotatably connected to both ends of the mounting base (201). An adjustment groove (2021) is provided on the clamping arm (202) along its length. A pressure seat (203) is provided between the two clamping arms (202). A clamping groove for accommodating the clamping arm (202) is provided at both ends of the pressure seat (203). An adjustment shaft (204) passing through the adjustment groove (2021) is fixedly connected in the clamping groove. A driving component (205) is installed on the top of the mounting base (201). The driving end of the driving component (205) passes through the mounting base (201) and is fixedly connected to the pressure seat (203). A connecting frame (208) is fixedly connected to the top of the mounting base (201) and outside the driving component (205).

5. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 4, characterized in that, The inner sides of the clamping ends of the two clamping arms (202) are fixedly connected to a first pressing member (206), and the bottom center of the pressure seat (203) is fixedly connected to a second pressing member (207). The first pressing member (206) and the second pressing member (207) are cylindrical.

6. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 4, characterized in that, The displacement mechanism includes a guide rod (210) fixedly connected to the top of the connecting frame (208). A guide sleeve (209) is fixedly connected to the guide rod (210) on the moving plate (301). The guide rod (210) is slidably installed inside the guide sleeve (209) and its top end passes through the guide sleeve (209) and is fixedly connected to a limiting plate (211). An elastic element (212) is sleeved between the limiting plate (211) and the moving plate (301) and outside the guide rod (210).

7. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 6, characterized in that, The mounting brackets (401) in the two sets of protective mechanisms are respectively fixedly connected to two movable plates (301). A plurality of telescopic protective rods (403) are also provided between the two sets of protective mechanisms. The number of telescopic protective rods (403) is the same as the number of fixed protective rods (4022) in each set of protective mechanisms. The fixed protective rod (4022) has a receiving groove at one end near the telescopic protective rod (403). The two ends of the telescopic protective rod (403) are respectively slidably installed in the receiving grooves of the fixed protective rods (4022) in the two sets of protective mechanisms that are in opposite positions.

8. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 7, characterized in that, The transmission assembly includes a second gear (404) fixedly connected to the end of the transmission shaft (4023) away from the telescopic guard rod (403). Two second gears (404) in the same set of the protective mechanism mesh with each other. A third gear (405) is also fixedly connected to the end of one of the transmission shafts (4023) of the protective mechanism away from the telescopic guard rod (403). A second rack (406) is arranged vertically on one side of the third gear (405). The third gear (405) meshes with the second rack (406). The second rack (406) is fixedly connected to the connecting frame (208).

9. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 7, characterized in that, The ends of several arc-shaped connecting plates (4021) in the half-body protective cover (402) away from the transmission shaft (4023) are fixedly connected to a closing plate (4024). A protective pad is glued to one end of the closing plate (4024). A sensor (6) is installed on one of the closing plates (4024) of the protective mechanism. An electromagnet (5) is installed at the top of the moving plate (301) corresponding to the position of the limiting plate (211). The limiting plate (211) is made of a magnetic material that attracts the electromagnet (5).

10. A lifting device for hoisting furnace rollers in an annealing furnace according to claim 1, characterized in that, The four corners at the top of the hanging plate (1) are all fixedly connected with hanging rings (7).

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