Quick roll change method and device

Abstract

The present application relates to the field of metallurgical equipment, and more particularly to a quick roll changing method and device. The method comprises: disassembling the upper roll; connecting and locking the shaft head holder of the lifting tool with the shaft head of the old upper roll, loosening the quick locking mechanism corresponding to the upper roll, and hoisting out the old upper roll together with its bearing seat; disassembling the lower roll; connecting and locking the shaft head holder of the lifting tool with the shaft head of the old lower roll, loosening the quick locking mechanism corresponding to the lower roll, and hoisting out the old lower roll together with its bearing seat; installing the lower roll; using the lifting device to hoist the new lower roll together with its bearing seat to the installation position through the lifting tool, and fixing the bearing seat of the new lower roll by using the quick locking mechanism corresponding to the lower roll; installing the upper roll; using the lifting device to hoist the new upper roll together with its bearing seat to the installation position through the lifting tool, and fixing the bearing seat of the new upper roll by using the quick locking mechanism corresponding to the upper roll. The quick roll changing method and device of the present application can greatly improve the roll changing efficiency and reduce the impact of roll changing on the production line operation.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment, and in particular to a method and apparatus for rapid roller changing. Background Technology

[0002] Currently, the upper and lower rolls of the pinch roll assembly in steel rolling mills require regular replacement and maintenance. Therefore, conventional lifting tools such as hand-operated hoists, slings, and wire ropes are essential. Two slings are placed around both ends of the roll, and the roll is lifted out of the pinch roll frame by slowly moving it laterally along the roll's axis using a hand-operated hoist and overhead crane. Conversely, when installing a new roll, a similar method is used in reverse to lift it into the pinch roll frame. Although the initial investment in these conventional lifting tools is minimal, the production line is frequently shut down for 8-10 hours each time the upper and lower rolls are replaced, severely impacting production line efficiency. Furthermore, using conventional lifting tools requires maintenance personnel to operate the tools closely throughout the entire lifting process, posing significant safety hazards.

[0003] Patent application CN205990168U discloses a squeezing roller replacement device for an acid leveling production line, which includes a horizontal lifting beam, a vertical lifting beam connected vertically to the horizontal lifting beam, lifting lugs provided on the horizontal lifting beam, and a counterweight block provided at one end of the horizontal lifting beam. A handle is provided on the vertical lifting beam, and a C-shaped hook is provided at the lower end of the vertical lifting beam. A through hole is provided on the C-shaped hook for accommodating bolts for locking the squeezing roller shaft head. When the squeeze roller needs to be replaced, a person slightly supports the handle on the vertical lifting beam to ensure the horizontal lifting beam and the entire replacement lifting device are in a horizontal and balanced position. The squeeze roller is then placed into the C-shaped hook. To prevent the squeeze roller from slipping out of the C-shaped hook and causing a safety accident, the squeeze roller in the C-shaped hook is locked to the C-shaped hook using bolts passing through the through holes. In other words, the bolts connect and lock the shaft end on the C-shaped lifting device and the squeeze roller. Then, the weight of the counterweight is adjusted according to the assembly center of gravity of the squeeze roller to achieve an overall horizontal and balanced state. The squeeze roller is then moved to the target position. Once the target position is reached, the person slightly supports the handle, and the squeeze roller is removed from the C-shaped hook. This replacement device can significantly improve the roller replacement efficiency, but the disassembly and installation of the roller also consume a lot of time, so the roller replacement efficiency still needs to be improved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and apparatus for rapid roll changing, which effectively improves the roll changing speed.

[0005] The present invention discloses a rapid roll changing method, wherein the roll changing mill includes an upper roll and a lower roll, and the bearing seats of the upper roll and the lower roll are fixed by a quick-locking mechanism. The rapid roll changing method includes the following steps:

[0006] Disassembling the upper roller: Connect and lock the shaft head clamp of the lifting device to the shaft head of the old upper roller, release the quick lock mechanism corresponding to the upper roller, use the lifting device to lift the old upper roller along with its bearing seat out through the lifting device, and then separate the old upper roller from the lifting device;

[0007] Disassembling the lower roller: Connect and lock the shaft head clamp of the lifting device to the shaft head of the old lower roller, release the quick-lock mechanism corresponding to the lower roller, use the lifting device to lift the roller along with its bearing seat out through the lifting device, and then separate the old lower roller from the lifting device;

[0008] Install the lower roller: Connect and lock the shaft head clamp of the lifting device to the shaft head of the new lower roller with bearing seat. Use the lifting device to lift the new lower roller together with its bearing seat to the installation position through the lifting device. Use the quick-locking mechanism corresponding to the lower roller to fix the bearing seat of the new lower roller. Then separate the lifting device from the new upper roller.

[0009] Install the upper roller: Connect and lock the shaft head clamp of the lifting device to the shaft head of the new upper roller with bearing housing. Use the lifting device to lift the new upper roller along with its bearing housing to the installation position. Use the corresponding quick-lock mechanism of the upper roller to fix the bearing housing of the new upper roller. Then separate the lifting device from the new upper roller.

[0010] Preferably, the quick-lock mechanism of the upper roller includes an operating side upper roller quick-lock mechanism and a transmission side upper roller quick-lock mechanism. Both the operating side upper roller quick-lock mechanism and the transmission side upper roller quick-lock mechanism include an inlet side telescopic quick-lock mechanism located at the roller mill inlet side and an outlet side telescopic quick-lock mechanism located at the roller mill outlet side.

[0011] Preferably, both the inlet-side telescopic quick-lock mechanism and the outlet-side telescopic quick-lock mechanism include a locking plate and an upper roller telescopic drive component. The locking plate has a window opening in the middle, and the upper roller telescopic drive component is horizontally arranged in the window opening and connected to the frame of the roller mill.

[0012] Preferably, an upper guide slide is horizontally arranged between the top of the upper roller telescopic drive member and the locking plate, and a lower guide slide is horizontally arranged between the bottom of the upper roller telescopic drive member and the locking plate.

[0013] Preferably, the roller mill frame is provided with a lower roller mounting groove, the bearing seat of the lower roller is installed in the lower roller mounting groove of the roller mill frame, and the quick-lock mechanism of the lower roller includes an operating side lower roller quick-lock mechanism and a transmission side lower roller quick-lock mechanism. Both the operating side lower roller quick-lock mechanism and the transmission side lower roller quick-lock mechanism include a lower roller telescopic drive component horizontally arranged on one side of the lower roller mounting groove.

[0014] Preferably, the lifting device includes a lifting beam and a shaft head clamp. The lifting beam includes a horizontal member and a vertical member connected to one end of the horizontal member. The shaft head clamp is disposed at the lower end of the vertical member. The top of the horizontal member is provided with a first lifting point and a second lifting point. At least one of the first lifting point and the second lifting point is connected to the lifting device through an adjustable length connector. The end of the horizontal member away from the vertical member is provided with a counterweight.

[0015] Before connecting the lifting device to the shaft head of the old upper roller, old lower roller, new upper roller, or new lower roller, adjust the counterweight of the lifting device so that the center of gravity of the lifting device is between the first lifting point and the second lifting point, and the lifting device is in a horizontal state.

[0016] The lifting device then lifts the lifting tool to a position close to the corresponding shaft head. By adjusting the length of the adjustable length connector, the lifting tool is precisely connected so that the center of the shaft head clamp of the lifting tool is aligned with the center of the corresponding shaft head.

[0017] Preferably, both the first lifting point and the second lifting point are connected to an adjustable length connector, which is a hand-operated hoist or a bolt pair.

[0018] Preferably, the bearing seats of the upper and lower rollers of the roller mill are provided with an auxiliary locking structure. The auxiliary locking structure includes a first stabilizing bracket and a second stabilizing bracket respectively provided on both sides of the corresponding shaft head. The shaft head clamp of the lifting device is provided with a fixing slot corresponding to the position of the first stabilizing bracket and the second stabilizing bracket.

[0019] When connecting and locking the shaft head clamp of the lifting device to the corresponding shaft head, the fastening bolt is inserted into the fixing slot on the first and second stabilizing brackets to lock the corresponding shaft head.

[0020] This application also discloses a quick roll changing device for the aforementioned quick roll changing method, including a lifting device and a quick lock mechanism. The quick lock mechanism for the upper roll includes an operating side upper roll quick lock mechanism and a transmission side upper roll quick lock mechanism, and the quick lock mechanism for the lower roll includes an operating side lower roll quick lock mechanism and a transmission side lower roll quick lock mechanism.

[0021] Preferably, both the operating side upper roller quick lock mechanism and the transmission side upper roller quick lock mechanism include an inlet side telescopic quick lock mechanism located at the roller mill inlet side and an outlet side telescopic quick lock mechanism located at the roller mill outlet side.

[0022] The bearing seat of the lower roller is installed in the lower roller mounting groove of the roller mill frame. Both the operating side lower roller quick lock mechanism and the transmission side lower roller quick lock mechanism include a lower roller telescopic drive component horizontally arranged on one side of the lower roller mounting groove.

[0023] Preferably, both the inlet-side telescopic quick-lock mechanism and the outlet-side telescopic quick-lock mechanism include a locking plate and an upper roller telescopic drive component. The locking plate has an opening in the middle, and the upper roller telescopic drive component is horizontally arranged in the opening and connected to the frame of the roller mill.

[0024] An upper guide slide is horizontally arranged between the top of the upper roller telescopic drive and the locking plate, and a lower guide slide is horizontally arranged between the bottom of the upper roller telescopic drive and the locking plate.

[0025] Preferably, the lifting device includes a lifting beam and a shaft head clamp. The lifting beam includes a horizontal member and a vertical member connected to one end of the horizontal member. The shaft head clamp is located at the lower end of the vertical member. The top of the horizontal member is provided with a first lifting point and a second lifting point. At least one of the first lifting point and the second lifting point is connected to the lifting device through an adjustable length connector. The end of the horizontal member away from the vertical member is provided with a counterweight.

[0026] Preferably, the bearing seats of the upper and lower rollers of the roller mill are provided with an auxiliary locking structure. The auxiliary locking structure includes a first stabilizing bracket and a second stabilizing bracket respectively provided on both sides of the corresponding shaft head. The shaft head clamp of the lifting device is provided with a fixing slot corresponding to the position of the first stabilizing bracket and the second stabilizing bracket. When the shaft head clamp of the lifting device is connected and locked to the corresponding shaft head, the fastening bolt is inserted into the fixing slot on the first stabilizing bracket and the second stabilizing bracket, so that the lifting device locks the corresponding shaft head.

[0027] The beneficial effects of this invention are: the rapid roll changing method and apparatus of this application can significantly improve roll changing efficiency, reduce the impact of roll changing on production line operations, and effectively improve the safety of roll changing. This application can be used for roll changing in roller mills where the bearing housing of the roll can be fixed by a quick-locking mechanism. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of a quick roller changing device and method for pinch rollers according to this patent.

[0029] Figure 2 This is a side view of the operating side of the pinch roll quick change device;

[0030] Figure 3 yes Figure 1 AA section view diagram;

[0031] Figure 4a This is a side view of the shaft head connection structure;

[0032] Figure 4b yes Figure 4a A top-down diagram;

[0033] Figures 5 to 9 This is a schematic diagram of the process of changing the upper roller;

[0034] Figures 10 to 12 This is a schematic diagram of the process of changing the lower roller.

[0035] Reference numerals: 1-Lifting device; 2-Adjustable length connector; 3-Quick lock mechanism for upper roller; 4-Quick lock mechanism for lower roller; 5-Inlet side telescopic quick lock mechanism; 6-Outlet side telescopic quick lock mechanism; 7-Operating side lower roller quick lock mechanism; 8-Transmission side lower roller quick lock mechanism; 9-Lifting beam; 10-Shaft head clamp; 11-Counterweight block assembly; 12-First lifting point; 13-Second lifting point; 14-Lifting strap; 15-Bolt pair; 16-Hand chain hoist; 17-Clamping block; 18-First stabilizing bracket; 19-Second stabilizing bracket; 20-Fasting bolt; 21-Shaft head; 22-Upper roller telescopic drive component; 23-Locking plate; 24-Upper guide slide plate; 25-Lower guide slide plate. Detailed Implementation

[0036] The present invention will be further described below.

[0037] The present invention discloses a rapid roll changing method, wherein the roll changing mill includes an upper roll and a lower roll, and the bearing seats of the upper roll and the lower roll are fixed by a quick-locking mechanism. The rapid roll changing method includes the following steps:

[0038] Disassembling the upper roller: Connect and lock the shaft head clamp 10 of the lifting device 1 to the shaft head 21 of the old upper roller. Release the quick-lock mechanism corresponding to the upper roller. Use the lifting device to lift the old upper roller along with its bearing seat through the lifting device 1. Then separate the old upper roller from the lifting device 1. Figure 5-9 As shown;

[0039] Disassembling the lower roller: Connect and lock the shaft head clamp 10 of the lifting device 1 to the shaft head 21 of the old lower roller. Release the quick-lock mechanism corresponding to the lower roller, and use the lifting device to lift the roller along with its bearing seat through the lifting device 1. Then separate the old lower roller from the lifting device 1. Figure 10-12 As shown;

[0040] Install the lower roller: Connect and lock the shaft head clamp 10 of the lifting device 1 to the shaft head 21 of the new lower roller with bearing seat. Use the lifting device to lift the new lower roller together with its bearing seat to the installation position through the lifting device 1. Use the quick-locking mechanism corresponding to the lower roller to fix the bearing seat of the new lower roller. Then separate the lifting device 1 from the new upper roller.

[0041] Install the upper roller: Connect and lock the shaft head clamp 10 of the lifting device 1 to the shaft head 21 of the new upper roller with bearing seat. Use the lifting device to lift the new upper roller together with its bearing seat to the installation position through the lifting device 1. Use the quick-locking mechanism corresponding to the upper roller to fix the bearing seat of the new upper roller. Then separate the lifting device 1 from the new upper roller.

[0042] When changing rolls on a roller mill, the upper roll is disassembled first, followed by the lower roll. Conversely, during installation, the lower roll is installed first, followed by the upper roll. The quick-lock mechanism refers to a structure capable of quickly locking and unlocking the bearing housing, such as a latching structure or a clamping structure. When disassembling the roll, the bearing housing can be quickly loosened, and the roll, along with the bearing housing, can be lifted out using a lifting device and lifting tool 1. When installing the roll, the new roll with the bearing housing is lifted into place using the lifting device, and then locked using the quick-lock mechanism. The lifting device is typically an overhead crane located in the factory building, and the lifting tool 1 can be the type disclosed in the prior art cited in the background section. This lifting tool 1 is more convenient to use than a conventional lifting tool 1.

[0043] Both bearing seats at the ends of the roller are fixed by quick-locking mechanisms. For the upper roller, the quick-locking mechanism 3 includes an operating side upper roller quick-locking mechanism and a transmission side upper roller quick-locking mechanism, which respectively realize the quick locking and unlocking of the operating side and transmission side of the upper roller. For pinch rollers and other roller machines that can be fixed by quick-locking mechanisms, their rollers are mainly subjected to forces in the front-to-back direction. Therefore, if... Figure 2 As shown, in a preferred embodiment of this application, both the operating side upper roller quick-lock mechanism and the transmission side upper roller quick-lock mechanism include an inlet-side telescopic quick-lock mechanism 5 located at the roller mill inlet and an outlet-side telescopic quick-lock mechanism 6 located at the roller mill outlet. A telescopic quick-lock mechanism refers to a mechanism that uses telescopic functionality to achieve locking. It typically uses hydraulic cylinders, threaded telescopic mechanisms, or similar structures as driving components. The inlet-side telescopic quick-lock mechanism 5 and the outlet-side telescopic quick-lock mechanism 6 can lock the roller bearing seat in the front-rear direction, thereby achieving rapid fixing of the roller. Specifically, in this preferred embodiment, both the inlet-side telescopic quick-lock mechanism 5 and the outlet-side telescopic quick-lock mechanism 6 include a locking plate 23 and an upper roller telescopic drive component 22. The locking plate 23 has a window opening in the middle, and the upper roller telescopic drive component 22 is horizontally positioned within the window opening and connected to the roller mill frame. The opening in the locking plate 23 primarily serves a guiding function, allowing the upper roller telescopic drive 22 to move under its guidance, pressing against the upper roller bearing seat to achieve locking. When it is necessary to loosen the bearing seat, the upper roller telescopic drive 22 simply reverses its movement. To ensure smooth relative sliding between the upper roller telescopic drive 22 and the locking plate 23, an upper guide slide plate 24 is horizontally positioned between the top of the upper roller telescopic drive 22 and the locking plate 23, and a lower guide slide plate 25 is horizontally positioned between the bottom of the upper roller telescopic drive 22 and the locking plate 23. The upper guide slide plate 24 and the lower guide slide plate 25 can be fixed to either the upper roller telescopic drive 22 or the locking plate 23, which helps reduce friction. The upper guide slide plate 24 and the lower guide slide plate 25 are typically made of materials with good lubricity, such as copper alloy.

[0044] To facilitate the installation of the lower roller, such as Figure 3 As shown, in a preferred embodiment of this application, the roller mill frame is provided with a lower roller mounting groove. The bearing seat of the lower roller is installed in the lower roller mounting groove of the roller mill frame. The quick-locking mechanism 4 of the lower roller includes an operating side lower roller quick-locking mechanism 7 and a transmission side lower roller quick-locking mechanism 8. Both the operating side lower roller quick-locking mechanism 7 and the transmission side lower roller quick-locking mechanism 8 include a lower roller telescopic drive component horizontally arranged on one side of the lower roller mounting groove. After the lower roller mounting groove is provided, the bearing seat of the lower roller is installed in it, so that the lower roller telescopic drive component is only provided on one side. The bearing seat is pressed against the inner wall of the groove on the other side by the lower roller telescopic drive component, thereby realizing the quick fixing of the lower roller. The upper roller telescopic drive component 22 and the lower roller telescopic drive component can both adopt the structure of hydraulic cylinder, pneumatic cylinder, electric cylinder, or length adjustable bolt pair, etc.

[0045] As mentioned above, the lifting device 1 is preferably the one disclosed in the background art reference documents; however, this lifting device 1 can still be further improved, such as... Figure 1 As shown, in a preferred embodiment of this application, the lifting device 1 includes a lifting beam 9 and a shaft head clamp 10. The lifting beam 9 includes a horizontal member and a vertical member connected to one end of the horizontal member. The shaft head clamp 10 is disposed at the lower end of the vertical member. The top of the horizontal member is provided with a first lifting point 12 and a second lifting point 13. At least one of the first lifting point 12 and the second lifting point 13 is connected to the lifting device through an adjustable length connector 2. A counterweight 11 is provided at the end of the horizontal member away from the vertical member.

[0046] Before connecting the lifting device 1 to the shaft head 21 of the old upper roller, old lower roller, new upper roller or new lower roller, first adjust the counterweight 11 of the lifting device 1 so that the center of gravity of the lifting device 1 is located between the first lifting point 12 and the second lifting point 13, and the lifting device 1 is in a horizontal state.

[0047] The lifting device then lifts the lifting device to a position close to the corresponding shaft head 21. By adjusting the length of the adjustable length connector 2, the lifting device 1 is precisely connected so that the center of the shaft head clamp 10 of the lifting device 1 is aligned with the center of the corresponding shaft head 21.

[0048] Compared to the existing lifting device 1, this lifting device 1 has two lifting points, which better ensures the stability of the lifting and prevents tilting compared to a single lifting point. Adjusting the center of gravity is also easier; it only requires ensuring the center of gravity is between the first lifting point 12 and the second lifting point 13. Adjusting the counterweight 11 keeps the lifting device 1 roughly horizontal. The adjustable-length connector 2, connecting the first and second lifting points 12 and 13, allows for more precise and direct adjustment of the lifting device 1, aligning the center of the connecting structure with the center of the corresponding shaft head 21. This facilitates the subsequent placement of the roller shaft head 21 into the shaft head holder 10 for connection. The shaft head holder 10 typically takes the form of a clamping block 17 as shown in the figure.

[0049] If either the first lifting point 12 or the second lifting point 13 is equipped with an adjustable length connector 2, relatively precise adjustment can be achieved. However, this requires the use of a lifting device, making operation somewhat inconvenient. Therefore, in the preferred embodiment of this application, both the first lifting point 12 and the second lifting point 13 are connected to adjustable length connectors 2. The adjustable length connector 2 can be a structure such as a hand-operated hoist 16 or a bolt pair 15 as shown in the figure. The adjustable length connector 2 can be connected to the lifting device along with the sling 14.

[0050] The shaft head clamp 10 can be referenced in the background art. To ensure stability, in a preferred embodiment of this application, the bearing seats of the upper and lower rollers of the roller mill are provided with auxiliary locking structures. These auxiliary locking structures include a first stabilizing bracket 18 and a second stabilizing bracket 19 respectively positioned on both sides of the shaft head 21. The shaft head clamp 10 of the lifting device 1 has fixing slots corresponding to the positions of the first stabilizing bracket 18 and the second stabilizing bracket 19. When the shaft head clamp 10 of the lifting device 1 is connected and locked to the corresponding shaft head 21, the fastening bolt 20 is inserted into the fixing slots on the first stabilizing bracket 18 and the second stabilizing bracket 19, thereby locking the corresponding shaft head 21. The connection between the first stabilizing bracket 18 and the second stabilizing bracket 19 on the bearing seat and the fixing slots on the shaft head clamp 10 of the lifting device 1 ensures the fixation of the lifting device 1 to the roller, effectively improving stability and safety. The placement of the first stabilizing bracket 18 and the second stabilizing bracket 19, with both positioned on the shaft head 21, ensures force balance on both sides.

[0051] As can be seen from the above description, two devices are essential for implementing the quick roll changing method of this application: the lifting device 1 and the quick-locking mechanism. The specific implementation methods of the lifting device 1 and the quick-locking mechanism have been fully described above and will not be repeated here.

Claims

1. A rapid roller changing method, characterized in that, The roller changing machine includes an upper roller and a lower roller. The bearing seats of the upper roller and the lower roller are fixed by a quick-locking mechanism. The quick roller changing method includes the following steps: Disassemble the upper roller: Connect and lock the shaft head clamp (10) of the lifting device (1) to the shaft head of the old upper roller, release the quick lock mechanism corresponding to the upper roller, use the lifting device to lift the old upper roller and its bearing seat out through the lifting device (1), and then separate the old upper roller from the lifting device (1). Disassemble the lower roller: Connect and lock the shaft head clamp (10) of the lifting device (1) to the shaft head of the old lower roller, release the quick lock mechanism corresponding to the lower roller, use the lifting device to lift out the bearing seat along with the roller through the lifting device (1), and then separate the old lower roller from the lifting device (1). Install the lower roller: Connect and lock the shaft head clamp (10) of the lifting device (1) to the shaft head of the new lower roller with bearing seat, use the lifting device to lift the new lower roller together with its bearing seat to the installation position through the lifting device (1), use the quick lock mechanism corresponding to the lower roller to fix the bearing seat of the new lower roller, and then separate the lifting device (1) from the new lower roller. Install the upper roller: Connect and lock the shaft head clamp (10) of the lifting device (1) to the shaft head of the new upper roller with bearing seat. Use the lifting device to lift the new upper roller together with its bearing seat to the installation position through the lifting device (1). Use the quick-locking mechanism corresponding to the upper roller to fix the bearing seat of the new upper roller. Then separate the lifting device (1) from the new upper roller. The upper roller quick-lock mechanism (3) includes an operating side upper roller quick-lock mechanism and a transmission side upper roller quick-lock mechanism. Both the operating side upper roller quick-lock mechanism and the transmission side upper roller quick-lock mechanism include an inlet side telescopic quick-lock mechanism (5) located at the roller mill inlet side and an outlet side telescopic quick-lock mechanism (6) located at the roller mill outlet side. Both the inlet side telescopic quick-lock mechanism (5) and the outlet side telescopic quick-lock mechanism (6) include a locking plate (23) and an upper roller telescopic drive component (22). The locking plate (23) has an opening in the middle. The upper roller telescopic drive component (22) is horizontally arranged in the opening and connected to the roller mill frame. An upper guide plate (24) is horizontally arranged between the top of the upper roller telescopic drive (22) and the locking plate (23), and a lower guide plate (25) is horizontally arranged between the bottom of the upper roller telescopic drive (22) and the locking plate (23); the roller frame is provided with a lower roller mounting groove, the bearing seat of the lower roller is installed in the lower roller mounting groove of the roller frame, and the quick lock mechanism (4) of the lower roller includes an operating side lower roller quick lock mechanism (7) and a transmission side lower roller quick lock mechanism (8). Both the operating side lower roller quick lock mechanism (7) and the transmission side lower roller quick lock mechanism (8) include a lower roller telescopic drive that is horizontally arranged on one side of the lower roller mounting groove. The lifting device (1) includes a lifting beam (9) and a shaft head clamp (10). The lifting beam (9) includes a horizontal member and a vertical member connected to one end of the horizontal member. The shaft head clamp (10) is located at the lower end of the vertical member. The top of the horizontal member is provided with a first lifting point (12) and a second lifting point (13). At least one of the first lifting point (12) and the second lifting point (13) is connected to the lifting device through an adjustable length connector (2). The end of the horizontal member away from the vertical member is provided with a counterweight (11). Before connecting the lifting device (1) to the shaft head of the old upper roller, old lower roller, new upper roller or new lower roller, adjust the counterweight (11) of the lifting device (1) so that the center of gravity of the lifting device (1) is between the first lifting point (12) and the second lifting point (13) and the lifting device (1) is in a horizontal state. Then, the lifting device is used to lift the lifting tool (1) to a position close to the corresponding shaft head. The lifting tool (1) is precisely adjusted by adjusting the length of the adjustable length connector (2) so that the center of the shaft head clamp (10) of the lifting tool (1) is aligned with the center of the corresponding shaft head. The upper and lower rollers of the roller mill are provided with an auxiliary locking structure. The auxiliary locking structure includes a first stabilizing bracket (18) and a second stabilizing bracket (19) respectively provided on both sides of the corresponding shaft head. The shaft head clamp (10) of the lifting device (1) is provided with a fixing slot at the position corresponding to the first stabilizing bracket (18) and the second stabilizing bracket (19). The connection between the first and second stabilizing brackets on the bearing housing and the fixing slot on the shaft head holder of the lifting device ensures the fixation of the lifting device to the upper and lower rollers.

2. The rapid roller changing method as described in claim 1, characterized in that: An adjustable length connector (2) is connected to both the first lifting point (12) and the second lifting point (13). The adjustable length connector (2) is a hand-operated hoist (16) or a bolt pair (15).

3. A quick roll changing device for the quick roll changing method according to any one of claims 1-2, characterized in that, It includes a lifting device (1) and a quick-locking mechanism. The quick-locking mechanism (3) of the upper roller includes an operating side upper roller quick-locking mechanism and a transmission side upper roller quick-locking mechanism. The quick-locking mechanism (4) of the lower roller includes an operating side lower roller quick-locking mechanism (7) and a transmission side lower roller quick-locking mechanism (8). Both the operating side upper roller quick lock mechanism and the transmission side upper roller quick lock mechanism include an inlet side telescopic quick lock mechanism (5) located on the roller mill inlet side and an outlet side telescopic quick lock mechanism (6) located on the roller mill outlet side. The bearing seat of the lower roller is installed in the lower roller mounting groove of the roller mill frame. The lower roller quick lock mechanism (7) on the operating side and the lower roller quick lock mechanism (8) on the transmission side both include a lower roller telescopic drive component that is horizontally arranged on one side of the lower roller mounting groove. The inlet-side telescopic quick-lock mechanism (5) and the outlet-side telescopic quick-lock mechanism (6) both include a locking plate (23) and an upper roller telescopic drive component (22). The locking plate (23) has an opening in the middle. The upper roller telescopic drive component (22) is horizontally positioned in the opening and connected to the frame of the roller mill. An upper guide slide plate (24) is horizontally arranged between the top of the upper roller telescopic drive member (22) and the locking plate (23), and a lower guide slide plate (25) is horizontally arranged between the bottom of the upper roller telescopic drive member (22) and the locking plate (23). The lifting device (1) includes a lifting beam (9) and a shaft head clamp (10). The lifting beam (9) includes a horizontal member and a vertical member connected to one end of the horizontal member. The shaft head clamp (10) is located at the lower end of the vertical member. The top of the horizontal member is provided with a first lifting point (12) and a second lifting point (13). At least one of the first lifting point (12) and the second lifting point (13) is connected to the lifting device through an adjustable length connector (2). The end of the horizontal member away from the vertical member is provided with a counterweight (11). The upper and lower rollers of the roller mill are provided with auxiliary locking structures. The auxiliary locking structures include a first stabilizing bracket (18) and a second stabilizing bracket (19) respectively provided on both sides of the corresponding shaft head. The shaft head clamp (10) of the lifting device (1) is provided with a fixing slot corresponding to the position of the first stabilizing bracket (18) and the second stabilizing bracket (19). The connection between the first stabilizing bracket and the second stabilizing bracket on the bearing seat and the fixing slot on the shaft head clamp of the lifting device can ensure the fixation of the lifting device with the upper and lower rollers.

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