Rolling mill housing lifting device with rotary lifting appliance and lifting method of rolling mill housing lifting device
By using a mill stand lifting device with a rotating hoist, the problem of insufficient hoisting space for the mill stand was solved, achieving safe and reliable posture adjustment and uniform force distribution, and reducing the dependence on the hoisting height of the overhead crane.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-27
- Publication Date
- 2026-03-31
AI Technical Summary
In the current process of hoisting the rolling mill stand, conventional hoisting methods require a high hoisting space, and the weight of the ring clamp beam occupies the capacity of the overhead crane, posing safety hazards and limiting the scope of application.
A rolling mill archway lifting device with a rotating hoist is adopted. The rotating hoist passes through the process hole of the archway and connects to the archway body to form a rigid lifting system. This eliminates the need for top wire ropes and shackles, reduces the clearance requirements for lifting, and allows for flexible posture adjustment.
It reduces the requirements for hoisting space, improves hoisting safety and flexibility, adapts to changes in the archway's posture, reduces restrictions on transport vehicles, and achieves uniform stress distribution.
Smart Images
Figure CN121757726A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of rolling mill archway lifting and installation technology, specifically a rolling mill archway lifting device with a rotating lifting tool and its lifting method. Background Technology
[0002] In the construction or equipment upgrade projects of metallurgical industrial plants, the installation of the rolling mill stand is a core and critical process. As the frame of the rolling mill, the stand is enormous in size and weighs hundreds of tons, typically requiring the coordinated lifting of two existing overhead cranes within the plant. Conventional lifting methods often employ a balance beam in conjunction with wire ropes. In such lifting operations, to ensure safety, the top of the overhead crane hooks, balance beams, and connecting wire rope slings must be higher than the top of the stand after it is erected, placing stringent requirements on the lifting space.
[0003] During the transition of the archway from a horizontal to an vertical position, the required length of the wire rope changes dynamically. Often, theoretical calculations may meet the requirements for the vertical position, but these may not be sufficient for the initial lifting condition or the transition process. To address the issue of insufficient lifting height, existing technologies sometimes use a ring-shaped clamping beam instead of a balance beam, shortening the rigging length by lowering the lifting point. However, the ring-shaped clamping beam itself is far heavier than a regular balance beam. This added weight significantly consumes the valuable lifting capacity of the overhead crane, potentially leading to overload operation, posing safety hazards, and limiting its application. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a rolling mill stand lifting device with a rotating lifting device and a lifting method thereof.
[0005] The technical solution adopted by this invention to solve its technical problem is:
[0006] A mill stand lifting device with a rotating hoist is used to lift a mill stand with a through hole for a mechanical pressing device in cooperation with two overhead cranes. The device includes a balance beam, a connecting frame, a pin assembly, and a rotating hoist. The balance beam has hanging structures at both ends that cooperate with the hooks of the overhead cranes. The connecting frame is fixedly installed in the lower middle part of the balance beam. The pin assembly is rotatably connected to the connecting frame. The rotating hoist includes a vertically arranged main lifting plate, an upper shaft fixed to the top of the main lifting plate, and a support plate fixed to the bottom of the main lifting plate. The upper shaft rotatably cooperates with the pin assembly, and the support plate passes through the through hole for the mechanical pressing device and supports the lower edge of the through hole.
[0007] Preferably, the pin assembly includes a pin body and a through hole disposed in the middle of the pin body; the pin body is rotatably connected to the connecting frame, and the upper shaft passes through the through hole of the pin body and is rotatably connected to the pin body.
[0008] Preferably, the rotating lifting device further includes a thrust bearing mounted on the upper shaft and located above the main body of the pin shaft, and a bushing mounted on the upper shaft and pressing against the thrust bearing, the bushing being fixedly connected to the upper shaft.
[0009] Preferably, the bushing is provided with an oil injection channel extending from the side to the bottom, and the oil injection channel corresponds to the position of the thrust bearing.
[0010] Preferably, the bearing is fitted with a bearing cover.
[0011] Preferably, the connecting frame consists of two parallel ear plates, with a pin assembly connecting the two ear plates.
[0012] Preferably, the balance beam is a box-shaped structure welded from steel plates, and has multiple reinforcing ribs inside.
[0013] Preferably, the suspension structure is a pin set inside both ends of the balance beam, and the upper flange at the end of the balance beam has a rectangular hole corresponding to the position of the pin.
[0014] A lifting method for a rolling mill stand lifting device with a rotating lifting device includes the following steps:
[0015] Step 1: Place the horizontally placed rolling mill archway under the two overhead cranes. The upper crossbeam of the rolling mill archway is equipped with a through hole for a mechanical pressing device.
[0016] Step 2: Hook the hooks of the two overhead cranes into the suspension structures at both ends of the balance beam;
[0017] Step 3: Pass the support plate of the rotating hoist through the through hole of the mechanical pressing device of the rolling mill stand from bottom to top, so that the support plate is above the through hole and supports the lower edge of the through hole;
[0018] Step 4: Connect the main lifting plate and upper shaft at the top of the rotating lifting device to the connecting frame below the balance beam via a pin assembly to form a rigid lifting system;
[0019] Step 5: Operate the two overhead cranes to lift the mill stand in sync, so that the mill stand rotates from a horizontal position to an upright position with its bottom as the fulcrum.
[0020] Step Six: Operate two overhead cranes to move the upright rolling mill archway horizontally and lower it to the installation base, completing the hoisting operation.
[0021] Preferably, in step four, after connecting the rotating lifting device and the connecting frame, the step further includes installing a thrust bearing and a bushing at the top of the upper shaft and adding a bearing cover for protection.
[0022] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:
[0023] This invention utilizes a rotating lifting device that passes through the archway's own process holes, acting directly on the archway body. This eliminates the need for wire ropes and shackles required in traditional methods to connect the top of the archway, minimizing the connection distance between the balance beam and the archway. This significantly reduces the overhead clearance requirements for hoisting and fundamentally solves the problem of insufficient hoisting height for overhead cranes in workshops. Simultaneously, the rotating lifting device can rotate horizontally and vertically relative to the balance beam, allowing for flexible posture adjustment of the archway during hoisting. This not only reduces restrictions on the direction of transport vehicle entry but also accommodates angular changes during the archway's transition from horizontal to vertical, ensuring even stress distribution and safety. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the main structure of the lifting device in an embodiment of the present invention;
[0025] Figure 2 This is a top view of the lifting device in an embodiment of the present invention;
[0026] Figure 3 This is a side view schematic diagram of the pin assembly connection structure in an embodiment of the present invention;
[0027] Figure 4 This is a cross-sectional structural diagram of the connection between the rotating lifting device and the pin assembly in an embodiment of the present invention;
[0028] Figure 5 This is a schematic diagram of the usage state structure of an embodiment of the present invention.
[0029] Explanation of reference numerals in the attached drawings: Balance beam 1, stiffening rib plate 1-1, pin 1-2, rectangular hole 1-3, ear plate 2, pin assembly 3, pin body 3-1, pin baffle 3-2, baffle bolt 3-3, rotating hoist 4, main hoist plate 4-1, auxiliary plate 4-2, sector plate 4-3, upper shaft 4-4, bushing 5, bearing cover screw 6, bearing cover 7, thrust bearing 8, rolling mill stand 9. Detailed Implementation
[0030] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.
[0031] like Figures 1 to 5 As shown in the figure, this embodiment provides a rolling mill stand lifting device with a rotating hoist. The device mainly consists of a balance beam, a connecting frame, a pin assembly, and a rotating hoist.
[0032] The balance beam 1 is constructed from high-strength steel plates welded into a box-shaped structure, exhibiting extremely high bending strength. To enhance its structural stability, several transverse and longitudinal reinforcing ribs 1-1 are welded internally to the balance beam 1. Suspension structures, consisting of pins 1-2 welded to the ends of the beam, are installed at both ends of the balance beam 1 for direct connection to the hooks of two overhead cranes. To facilitate the insertion and removal of the crane hooks, rectangular holes 1-3 corresponding to the positions of the pins 1-2 are provided on the upper flanges at the ends of the balance beam 1.
[0033] A connecting frame is fixedly installed at the center of the bottom surface of the lower flange of the balance beam 1. The connecting frame consists of two parallel and symmetrically arranged ear plates 2, which are fully welded to the flange of the balance beam 1.
[0034] The pin assembly 3 is used to connect the lugs 2 and the rotating lifting device. The pin assembly 3 includes a pin body 3-1. The pin body 3-1 passes through the two lugs 2, and its end is rotatably connected to the lugs 2, for example, by locking it with a pin baffle 3-2 and baffle bolts 3-3 to prevent axial movement. A through vertical hole is machined in the middle of the pin body 3-1.
[0035] The rotating hoist 4 is a key component directly connected to the rolling mill stand 9. It is a rigid whole welded together from the main hoist plate 4-1, auxiliary plate 4-2, sector plate 4-3, and upper shaft 4-4. The main hoist plate 4-1 is vertically positioned and is the main load-bearing component. The upper shaft 4-4 is welded to the top of the main hoist plate 4-1. At the bottom of the rotating hoist 4, the main hoist plate 4-1, auxiliary plate 4-2, and sector plate 4-3 together form a support plate structure. This support plate is disc-shaped or inverted T-shaped, and its dimensions allow it to freely pass through the through-hole of the mechanical pressing device on the upper beam of the rolling mill stand 9. The larger disc portion at the bottom can be locked onto the lower edge of the through-hole, thus bearing the weight of the entire stand.
[0036] During assembly, the upper shaft 4-4 of the rotating lifting device 4 passes upward through the through hole in the middle of the pin body 3-1, connecting with the balance beam 1. To reduce rotational friction and withstand the enormous axial load, a thrust bearing 8 and a bushing 5 are sequentially mounted on the top of the upper shaft 4-4, above the pin body 3-1. The thrust bearing 8 is used to withstand the enormous axial pressure generated during lifting and to allow relative rotation between the upper shaft 4-4 and the pin body 3-1. The bushing 5 is mounted on the upper shaft 4-4 and presses against the thrust bearing 8. The bushing 5 is fixed to the upper shaft 4-4 and rotates with the shaft. The bushing 5 has an oil filling channel machined from the side to the bottom for adding grease to the thrust bearing 8. Finally, a bearing cover 7 is installed on the outside of the thrust bearing 8 and fixed to the bushing 5 with bearing cover screws 6 to protect the thrust bearing 8 from dust and impurities.
[0037] With the above structure, the rotating hoist 4 has a rotational degree of freedom around the upper shaft 4-4 axis, and a swinging degree of freedom around the horizontal axis through the pin assembly 3, thus realizing a universal connection with the balance beam 1.
[0038] A lifting method for a rolling mill stand lifting device with a rotating lifting device, the method comprising the following detailed steps:
[0039] Step 1: Preparation. Move the trailer carrying the rolling mill stand 9 to the designated hoisting position beneath the two overhead cranes. The rolling mill stand 9 is placed horizontally on the trailer, with pre-machined or naturally formed through holes on its upper crossbeams for installing the mechanical pressing device. Depending on the site conditions, the stand can be placed parallel to or perpendicular to the rolling line.
[0040] Step 2: Hooking. Operate the two overhead cranes to move their hooks directly above both ends of the balance beam 1, and lower the hooks so that they pass through the rectangular holes 1-3 in the upper flange of the end of the balance beam 1 and are accurately hooked onto the pin 1-2.
[0041] Step 3: Install the rotating hoist. The operator moves the rotating hoist 4 to below the through hole of the rolling mill stand 9. The rotating hoist 4 is passed through the through hole from bottom to top until the upper shaft 4-4 protrudes from the through hole. The support plate structure supports the lower edge of the through hole 9-1, thereby connecting the rolling mill stand 9 and the rotating hoist 4 together.
[0042] Step 4: Connect the balance beam and the lifting device. Operate the overhead crane to lower the balance beam 1 to the vicinity of the rotating lifting device 4. Align the main lifting plate 4-1 and its upper shaft 4-4 at the top of the rotating lifting device 4 and insert them into the through hole in the middle of the pin body 3-1 of the pin assembly 3. Then, install the thrust bearing 8 and the bushing 5 sequentially on the top of the upper shaft 4-4, and fix the bearing cover 7 with screws. At this point, the balance beam 1, the rotating lifting device 4, and the rolling mill stand 9 form a rigid lifting system.
[0043] Step 5, posture conversion. Operate the two overhead cranes again to raise the balance beam 1 at an extremely slow and synchronized speed. As the balance beam 1 rises, the rotating spreader 4 automatically adapts to the angle change through its universal joint structure. The mill stand 9 uses the contact point between its bottom and the trailer or ground pad as a fulcrum, and rotates smoothly and gradually around the fulcrum from a horizontal position until it is completely upright.
[0044] Step Six, Positioning. After the mill stand 9 is erected, stop lifting. Operate two overhead cranes alternately to lower the upright mill stand 9 horizontally to directly above its mounting base. Slowly lower the overhead crane hooks to accurately position the mill stand 9 on the mounting base, completing the entire hoisting operation.
[0045] This invention utilizes a rotating lifting device that passes through the archway's own process holes, acting directly on the archway body. This eliminates the need for wire ropes and shackles required in traditional methods to connect the top of the archway, minimizing the connection distance between the balance beam and the archway. This significantly reduces the overhead clearance requirements for hoisting and fundamentally solves the problem of insufficient hoisting height for overhead cranes in workshops. Simultaneously, the rotating lifting device can rotate horizontally and vertically relative to the balance beam, allowing for flexible posture adjustment of the archway during hoisting. This not only reduces restrictions on the direction of transport vehicle entry but also accommodates angular changes during the archway's transition from horizontal to vertical, ensuring even stress distribution and safety.
[0046] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.
Claims
1. A mill stand lifting device with a rotating hoist, used in conjunction with two overhead cranes to lift a mill stand with a through hole for a mechanical pressing device, characterized in that: It includes a balance beam, a connecting frame, a pin assembly, and a rotating lifting device; the balance beam has a hanging structure at both ends that cooperates with the crane hook; the connecting frame is fixedly installed in the lower middle part of the balance beam; the pin assembly is rotatably connected to the connecting frame; the rotating lifting device includes a vertically installed main lifting plate, an upper shaft fixed to the top of the main lifting plate, and a support plate fixed to the bottom of the main lifting plate; the upper shaft is rotatably engaged with the pin assembly, and the support plate is used to pass through the through hole of the mechanical pressing device and support the lower edge of the through hole.
2. The rolling mill stand lifting device with rotating hoist according to claim 1, characterized in that: The pin assembly includes a pin body and a through hole disposed in the middle of the pin body; the pin body is rotatably connected to the connecting frame, and the upper shaft passes through the through hole of the pin body and is rotatably connected to the pin body.
3. The mill stand lifting device with rotating hoist according to claim 2, characterized in that: The rotating lifting device also includes a thrust bearing mounted on the upper shaft and located above the main body of the pin shaft, and a bushing mounted on the upper shaft and pressing against the thrust bearing, with the bushing fixedly connected to the upper shaft.
4. The mill stand lifting device with rotating hoist according to claim 3, characterized in that: The bushing is provided with an oil injection channel extending from the side to the bottom, and the oil injection channel corresponds to the position of the thrust bearing.
5. The rolling mill stand lifting device with rotating hoist according to claim 3, characterized in that: The bearing is fitted with a bearing cover.
6. The rolling mill stand lifting device with rotating hoist according to claim 1, characterized in that: The connecting frame consists of two parallel ear plates, with a pin assembly connecting the two ear plates.
7. The mill stand lifting device with rotating hoist according to claim 1, characterized in that: The balance beam is a box-shaped structure welded from steel plates, with multiple reinforcing ribs inside.
8. The rolling mill stand lifting device with rotating hoist according to claim 1, characterized in that: The suspension structure consists of pins located inside both ends of the balance beam, and the upper flange at the end of the balance beam has rectangular holes corresponding to the positions of the pins.
9. A lifting method using a rolling mill stand lifting device with a rotating lifting head as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: Place the horizontally placed rolling mill archway under the two overhead cranes. The upper crossbeam of the rolling mill archway is equipped with a through hole for a mechanical pressing device. Step 2: Hook the hooks of the two overhead cranes into the suspension structures at both ends of the balance beam; Step 3: Pass the support plate of the rotating hoist through the through hole of the mechanical pressing device of the rolling mill stand from bottom to top, so that the support plate is above the through hole and supports the lower edge of the through hole; Step 4: Connect the main lifting plate and upper shaft at the top of the rotating lifting device to the connecting frame below the balance beam via a pin assembly to form a rigid lifting system; Step 5: Operate the two overhead cranes to lift the mill stand in sync, so that the mill stand rotates from a horizontal position to an upright position with its bottom as the fulcrum. Step Six: Operate two overhead cranes to move the upright rolling mill archway horizontally and lower it to the installation base to complete the hoisting operation.
10. The lifting method of the rolling mill stand lifting device with rotating lifting device according to claim 9, characterized in that: In step four, after connecting the rotating lifting device and the connecting frame, the process further includes installing a thrust bearing and a bushing at the top of the upper shaft, and adding a bearing cover for protection.