Method for quick change of a drum-type toothed arbor of a strip rolling mill

Abstract

The application discloses a method for quickly replacing a drum-shaped tooth joint shaft of a strip rolling mill, and a device for the same. The device comprises a movable sleeve and a limiting group. The movable sleeve comprises an upper supporting sleeve and a lower supporting sleeve, both of which are half-cylindrical. The upper supporting sleeve and the lower supporting sleeve are rotatably connected on one side of a long shaft and detachably connected on the other side of the long shaft. The limiting group comprises a plurality of supporting screws, which are respectively threadedly installed on the upper supporting sleeve and the lower supporting sleeve and are arranged along the radial direction of the half-cylindrical shape. The device is used for sleeving on a flat head sleeve of a hot strip rolling mill and a drum-shaped tooth joint shaft. One end of the movable sleeve is tightly clamped on the flat head sleeve, and the limiting group close to the other end of the movable sleeve is tightly abutted against the drum-shaped tooth joint shaft, so that the drum-shaped tooth joint shaft can be moved from the driving side of the rolling mill to the operating side of the rolling mill through the inside of the rolling mill along with a rolling roller.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled strip mill technology, and in particular to a method for quickly changing the drum-shaped toothed joint shaft of a strip mill. Background Technology

[0002] The replacement of the drum-shaped toothed joint shaft in hot-rolled strip mills is a difficult problem that plagues all hot rolling mills. In the "Cause-and-Effect Diagram Method for Replacing the Drum-shaped Toothed Joint Shaft in Finishing Mills" published in "Shandong Metallurgy" in 2015, the construction process was improved by using the cause-and-effect diagram method, reducing the construction time from 12 hours to 6 hours.

[0003] In actual production, the traditional method of using overhead cranes and chain hoists can complete the replacement of the drum-shaped gear shaft in as little as 6 hours. However, the replacement process is relatively cumbersome and involves high labor intensity for workers. With the gradual reduction of production costs, the shortage of human resources, and the increasing emphasis on safety management by the state and enterprises, reducing replacement time, lowering labor intensity for workers, and ensuring construction safety have become essential. Summary of the Invention

[0004] Based on the above problems, this application provides a method for quickly replacing the drum-shaped toothed joint shaft of a strip mill.

[0005] This application provides a device for quickly replacing the drum-shaped toothed joint shaft of a strip mill, including a movable sleeve and a limiting group. The movable sleeve includes an upper support sleeve and a lower support sleeve, both of which are semi-cylindrical. The upper support sleeve and the lower support sleeve are rotatably connected on one long axis side and detachably connected on the other long axis side. The limiting group includes a plurality of support screws, which are threaded onto the upper support sleeve and the lower support sleeve respectively. The support screws are arranged radially along the semi-cylindrical shape. The device is used to fit onto the flat head sleeve and the drum-shaped toothed joint shaft of a hot-rolled strip mill. One axial end of the movable sleeve hugs the flat head sleeve, and the limiting group near the other axial end of the movable sleeve abuts against the drum-shaped toothed joint shaft, so that the drum-shaped toothed joint shaft can be moved from the mill drive side through the mill interior to the mill operation side along with the roll.

[0006] In some embodiments, the movable sleeve includes an axial first end and an axial second end located at opposite ends in the axial direction, a limiting group is disposed relatively close to the axial first end, and the inner diameter of the movable sleeve near the axial second end is equal to the outer diameter of the flat-head sleeve.

[0007] In some implementations, the multiple support screws of the limiting assembly are all located at the same circumference of the movable sleeve.

[0008] In some embodiments, the limiting assembly includes four support screws, which are arranged in pairs on the upper support sleeve and the lower support sleeve. The two support screws on the upper support sleeve are symmetrically arranged with respect to the central axis of the semi-cylindrical shape of the upper support sleeve, and the two support screws on the lower support sleeve are symmetrically arranged with respect to the central axis of the semi-cylindrical shape of the lower support sleeve. The movable sleeve forms a splicing surface with the upper support sleeve and the lower support sleeve, and the two support screws on the upper support sleeve and the two support screws on the lower support sleeve are symmetrically arranged with respect to the splicing surface.

[0009] In some embodiments, the upper support sleeve and the lower support sleeve are rotatably connected on one long axis side by a pivot.

[0010] In some embodiments, both the upper support sleeve and the lower support sleeve are provided with outwardly protruding connecting plates on one long axis side, and each connecting plate is provided with a channel, and bolts are installed in the channel to achieve a detachable connection between the upper support sleeve and the lower support sleeve on one long axis side.

[0011] In some implementations, the outer diameter of the upper support sleeve is equal to the outer diameter of the lower support sleeve.

[0012] A method for quickly replacing the drum-shaped toothed joint shaft of a strip mill, using the aforementioned device for quickly replacing the drum-shaped toothed joint shaft of a strip mill, includes: opening the movable sleeve in the device and fitting it onto the flat head sleeve and the drum-shaped tooth; after the movable sleeve is fitted onto the flat head sleeve and the drum-shaped tooth, closing the movable sleeve and tightening the internal support screw, so that the flat head sleeve, the device, and the drum-shaped toothed joint shaft form a whole; after forming a whole, pulling the roll to carry the drum-shaped toothed joint shaft through the inside of the mill to the operating side of the mill.

[0013] In some implementations, a roll changing trolley is used to pull out the rolls and the drum-shaped toothed shaft.

[0014] In some embodiments, the drum-shaped toothed shaft includes an upper drum-shaped toothed shaft and a lower drum-shaped toothed shaft spaced apart, and the method includes replacing the lower drum-shaped toothed shaft without removing the upper drum-shaped toothed shaft.

[0015] The beneficial effects of this application are as follows: It provides a device for quickly replacing the drum-shaped toothed joint shaft of a strip mill, including a movable sleeve and a limiting group. The device is fitted onto the flat head sleeve and the drum-shaped toothed joint shaft of the hot-rolled strip mill. One axial end of the movable sleeve clamps the flat head sleeve, and the limiting group near the other axial end of the movable sleeve abuts against the drum-shaped toothed joint shaft, allowing the drum-shaped toothed joint shaft to be moved from the mill drive side through the mill interior to the mill operating side along with the rolls. Since there are no platforms or other accessories on the mill operating side, it is convenient for the overhead crane to directly lift the drum-shaped toothed joint shaft, eliminating the need for manual crane lifting operations and avoiding the skewed pulling phenomenon caused by manual chain hoisting. This achieves rapid and safe replacement of the joint shaft, saves time and workload in disassembling and assembling accessories on the mill drive side, and makes the construction process more standardized. It has the beneficial effects of fewer construction steps, lower requirements for personnel technical level, further shortened construction time, reduced safety risks during construction, and reduced labor intensity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0017] Figure 1 A schematic diagram of the overall structure of a hot-rolled strip mill at the drum-shaped toothed joint shaft, provided in this application;

[0018] Figure 2 An axial view of the device for quickly changing the drum-shaped toothed joint shaft of a strip mill provided in this application;

[0019] Figure 3 for Figure 2 A schematic diagram of the first cross-section;

[0020] Figure 4 for Figure 2 A schematic diagram of the second cross section;

[0021] Figure 5 This is a schematic diagram illustrating the quick-change strip mill drum-shaped toothed shaft relative to the fixed flat head sleeve and drum-shaped toothed shaft provided in this application.

[0022] Figure captions: 10- Device for quick replacement of the drum-shaped geared shaft of the strip mill; 100- Movable sleeve; 110- Upper support sleeve; 120- Lower support sleeve; 130- Rotating shaft; 140- Bolt; 141- Connecting plate; 200- Limiting assembly; 210- Support screw; 20- Flat head sleeve; 30- Drum-shaped geared shaft; 40- Roll; 50- Installation position of the device; 60- Gear base; 70- Gear base gear sleeve. Detailed Implementation

[0023] Please refer to Figure 1, Figure 1 The exhibit includes a flat head sleeve 20, a drum-shaped gear shaft 30, a roller 40, a gear base 60, and a gear base sleeve 70. The drum-shaped gear shaft and the flat head sleeve are connected by a drum-shaped gear transmission, which can compensate for axial and angular axis deviations, so the overall movement of the drum-shaped gear shaft is uncontrolled.

[0024] Combination Figure 1 The existing replacement process is explained in detail below:

[0025] 1) Inspect the dimensions and technical properties of spare parts materials.

[0026] 2) Process work permits and attach work badges.

[0027] 3) Pull out the upper and lower working rollers.

[0028] 4) Disassemble the corresponding transmission side walkway and lift it away; turn off the thin oil lubrication and disconnect the lubricating oil hard and hose; remove the cover of the oil collection tank at the gear base end and lift it away; disconnect the shaft gear end connecting rod; remove the inner gear ring end cover of the gear end assembly.

[0029] 5) Use an overhead crane and chain hoist to suspend the upper connecting shaft, and the operator coordinates to open and tighten the upper connecting shaft clamp; lift the upper connecting shaft; use an overhead crane and chain hoist to suspend the lower connecting shaft, and the operator coordinates to open and tighten the lower connecting shaft clamp; lift the lower connecting shaft.

[0030] 6) Reinstall the lower connecting shaft, and use a chain hoist to pull the drum-shaped gear connecting shaft into the gear sleeve of the gear base.

[0031] 7) Operators cooperate to operate the shaft clamping device to clamp the shaft clamping roller end assembly.

[0032] 8) Reinstall the connecting shaft in the same way.

[0033] 9) Install the toothed connecting rod assembly and end cap, reassemble the housing, install the lubrication hose, install the shaft cover and tighten the bolts.

[0034] 10) Open the thin oil lubrication valve.

[0035] 11) Install the rolling mill work rolls.

[0036] 12) Reinstall the walking platform.

[0037] 13) After the work is completed, clean up the site, return the license plate and test drive the vehicle.

[0038] The above is the current technical solution. This solution requires the use of an overhead crane for hoisting throughout the process, and the replacement of the drum-shaped gear shaft can be completed in as little as 6 hours.

[0039] The existing technology of using manual chain hoists in conjunction with overhead crane operations has the following disadvantages: 1) Numerous construction steps and complex replacement processes, requiring high levels of technical expertise from personnel. 2) Long construction time; currently, the best replacement level takes 6 hours, significantly impacting production line output. 3) High safety risks during construction; the space on the drive side of the strip mill is limited, and the replacement process requires manual operation of the chain hoist in conjunction with overhead crane lifting, which can lead to uneven pulling and skewing, resulting in high safety risks. 4) Due to the manual chain hoisting operation, a large number of maintenance workers are required, resulting in low labor efficiency and high labor intensity.

[0040] To address the aforementioned problems, this embodiment provides a device 10 for quickly replacing the drum-shaped geared shaft of a strip mill. Please refer to [reference needed]. Figures 2 to 4 The device includes a movable sleeve 100 and a limiting group 200. The movable sleeve 100 includes an upper support sleeve 110 and a lower support sleeve 120, both of which are semi-cylindrical. The upper support sleeve 110 and the lower support sleeve 120 are rotatably connected on one long axis side and detachably connected on the other long axis side. The limiting group 200 includes a plurality of support screws 210. The support screws 210 are threaded onto the upper support sleeve 110 and the lower support sleeve 120 respectively. The support screws 210 are arranged radially along the semi-cylindrical shape.

[0041] Figure 1 The image shows the installation location of this device at 50. Please refer to... Figure 5 The device 10 is mounted on the flat end sleeve 20 and the drum-shaped toothed shaft 30 of the hot-rolled strip mill, so that one axial end of the movable sleeve 100 hugs the flat end sleeve 20, while the limiting assembly 200 near the other axial end of the movable sleeve 100 abuts against the drum-shaped toothed shaft 30, thus forming... Figure 5 This state allows the drum-shaped toothed shaft 30 to move from the mill drive side through the mill interior to the mill operation side along with the roll 40.

[0042] In detail, because the drum-shaped toothed shaft 30 and the flat-head sleeve 20 are connected by the drum-shaped toothed shaft 30, which can compensate for axial and angular axis deviations, the overall oscillation of the drum-shaped toothed shaft 30 is uncontrolled. Using this device 10, the drum-shaped toothed shaft 30 is fixed to the flat-head sleeve 20 on the roll 40, which restricts the oscillation of the drum-shaped toothed shaft 30 and ensures that it passes smoothly through the window inside the mill. At this point, the roll trolley can be used to pull out the roll 40 and the drum-shaped toothed shaft 30, thereby pulling the drum-shaped toothed shaft 30 from the mill drive side through the mill interior to the mill operation side, achieving a quick and safe replacement of the drum-shaped toothed shaft 30.

[0043] This allows the drum-shaped toothed shaft 30 to be moved from the mill drive side through the mill interior to the mill operating side along with the roll 40. Since there are no platforms or other accessories on the mill operating side, it is convenient for the overhead crane to directly lift the drum-shaped toothed shaft 30. This eliminates the need for manual assistance in overhead crane lifting operations and avoids the skewed pulling phenomenon that occurs when manual chain hoisting is used in conjunction with overhead crane lifting. This enables the rapid and safe replacement of the connecting shaft, saves time and workload in disassembling and assembling accessories on the mill drive side, and makes the construction process more standardized.

[0044] This device uses set screws to fix the drum-shaped toothed shaft 30, which has a solid and reliable structure and is easy to adjust.

[0045] By fixing the drum-shaped toothed shaft 30 with this device, the shaft can be pulled directly from inside the archway to the operating side of the rolling mill along with the roll 40. This saves time and workload in disassembling and assembling the rolling mill drive-side accessories, facilitates direct hoisting by the overhead crane, eliminates the need for manual assistance in overhead crane lifting operations, and makes the construction process more standardized.

[0046] The device of this application consists of an upper support sleeve 110 and a lower support sleeve 120 forming a movable sleeve 100, which adopts a split structure to facilitate process operation.

[0047] The device described in this application has at least the following advantages: 1) Fewer construction steps and fewer disassembly of accessories. 2) Lower requirements for personnel skill levels, especially for crane operators. 3) Construction time is reduced by half from the previous best domestic method of 6 hours to 3 hours, and the lower drum-shaped toothed shaft 30 can be replaced without disassembling the upper drum-shaped toothed shaft 30. 4) Reduced safety risks during construction, as manual chain hoisting is not required to assist the overhead crane, avoiding skewed pulling. 5) Reduced labor intensity, as manual lifting is not required.

[0048] In some embodiments, the movable sleeve 100 includes an axial first end and an axial second end located at opposite ends in the axial direction. The limiting group 200 is disposed relatively close to the axial first end to limit the drum-shaped toothed shaft 30. The inner diameter of the movable sleeve 100 near the axial second end is equal to the outer diameter of the flat head sleeve 20. After the upper support sleeve 110 and the lower support sleeve 120 are fixedly connected, the movable sleeve 100 hugs the flat head sleeve 20.

[0049] In some embodiments, the upper support sleeve 110 and the lower support sleeve 120 are connected along a long axis by bolts 140. For details, please refer to the reference. Figure 2 and Figure 4The upper support sleeve 110 has an outwardly protruding connecting plate 141 on one long axis side, and the lower support sleeve 120 also has an outwardly protruding connecting plate 141 on one long axis side. When the movable sleeve 100 is closed, the two connecting plates 141 are close together. Each connecting plate 141 has a channel for inserting bolts 140, thus achieving a fixed connection at that point. Figure 4 As shown, a row of numerous bolt mounting holes is provided along the length direction of the connecting plate 141, which is also the axial direction of the movable sleeve 100.

[0050] In some implementation methods, please refer to Figure 3 The outer diameter of the upper support sleeve 110 is equal to the outer diameter of the lower support sleeve 120.

[0051] Regarding the rotatable connection between the outer diameter of the upper support sleeve 110 and the lower support sleeve 120, please refer to the following reference. Figure 2 and Figure 3 A rotatable connection can be achieved using a rotating shaft 130, which is arranged along the axial direction of the movable sleeve 100.

[0052] In some implementation methods, please refer to the reference. Figures 2 to 4 The multiple support screws 210 of the limit group 200 are all set on the same circumference of the movable sleeve 100. The abutment limit of the docking shaft can be achieved by setting multiple support screws 210 on a circumference.

[0053] In some implementation methods, please refer to Figures 2 to 4 The limiting assembly 200 includes four support screws 210, which are arranged in pairs on the upper support sleeve 110 and the lower support sleeve 120. The two support screws 210 on the upper support sleeve 110 are symmetrically arranged relative to the central axis of the semi-cylindrical shape of the upper support sleeve 110, and the two support screws 210 on the lower support sleeve 120 are symmetrically arranged relative to the central axis of the semi-cylindrical shape of the lower support sleeve 120.

[0054] Overall, the movable sleeve 100 is assembled from an upper support sleeve 110 and a lower support sleeve 120, forming a splicing surface, as shown in the figure. Figure 2 As shown by the horizontal straight line in the figure, the two support screws 210 of the upper support sleeve 110 and the two support screws 210 of the lower support sleeve 120 are symmetrically arranged relative to the splicing surface.

[0055] This embodiment also discloses a method for quickly replacing the drum-shaped toothed joint shaft of a strip mill, which utilizes the aforementioned device 10 for quickly replacing the drum-shaped toothed joint shaft of a strip mill. Specifically, it includes: opening the movable sleeve 100 in the device 10 and fitting it onto the flat head sleeve 20 and the drum-shaped tooth; after the movable sleeve 100 is fitted onto the flat head sleeve 20 and the drum-shaped tooth, closing the movable sleeve 100 and tightening the support screw 210 internally, so that the flat head sleeve 20, the device 10, and the drum-shaped toothed joint shaft 30 form a whole; after forming a whole, pulling the roll 40 to carry the drum-shaped toothed joint shaft 30 through the inside of the mill to the operating side of the mill.

[0056] This method allows for the smooth installation of a device 10 for quickly replacing the drum-shaped toothed shaft of a strip mill without disassembling the roll 40, flat head sleeve 20, and drum-shaped toothed shaft 30. Afterward, the roll 40 and drum-shaped toothed shaft 30 can be pulled out using a roll changing trolley. The drum-shaped toothed shaft 30 can then be moved from the mill drive side through the mill interior to the mill operation side along with the roll 40.

[0057] Figure 1 The image shows two drum-shaped toothed shafts 30: an upper drum-shaped toothed shaft 30 and a lower drum-shaped toothed shaft 30. The lower drum-shaped toothed shaft 30 can be replaced without removing the upper drum-shaped toothed shaft 30.

[0058] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0059] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for quickly changing the drum-type geared shaft of a strip rolling mill, characterized in that, A device for quickly changing the drum-shaped toothed joint shaft of a strip mill is applied. The device for quickly changing the drum-shaped geared shaft of the strip mill includes: The movable sleeve includes an upper support sleeve and a lower support sleeve, both of which are semi-cylindrical in shape. The upper support sleeve and the lower support sleeve are rotatably connected on one long axis side and detachably connected on the other long axis side. The limiting assembly includes multiple support screws, which are threaded onto the upper support sleeve and the lower support sleeve respectively, and the support screws are arranged radially along the semi-cylindrical shape. The device is used to be fitted onto the flat head sleeve and the drum-shaped toothed shaft of a hot-rolled strip mill. The movable sleeve includes an axial first end and an axial second end located at opposite ends in the axial direction. The limiting group is arranged relatively close to the axial first end. The inner diameter of the movable sleeve near the axial second end is equal to the outer diameter of the flat head sleeve. One axial end of the movable sleeve is used to hold the flat head sleeve tightly, and the limiting group near the other axial end of the movable sleeve is used to abut against the drum-shaped toothed shaft, so that the drum-shaped toothed shaft can move with the roll from the mill drive side through the mill interior to the mill operation side. The method includes: Open the movable sleeve in the device and slip it over the flat head sleeve and the drum-shaped teeth; After the movable sleeve is fitted onto the flat head sleeve and the drum-shaped tooth, the movable sleeve is closed, and the support screw is screwed inward, so that the flat head sleeve, the device and the drum-shaped tooth connecting shaft form a whole. Once the whole is formed, the roller is pulled to carry the drum-shaped toothed shaft through the inside of the mill to the operating side of the mill.

2. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, The multiple support screws of the limiting group are all located on the same circumference of the movable sleeve.

3. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 2, characterized in that, The limiting group includes four support screws, which are arranged in pairs on the upper support sleeve and the lower support sleeve. The two support screws on the upper support sleeve are symmetrically arranged with respect to the central axis of the semi-cylindrical shape of the upper support sleeve, and the two support screws on the lower support sleeve are symmetrically arranged with respect to the central axis of the semi-cylindrical shape of the lower support sleeve. The movable sleeve is formed by the upper support sleeve and the lower support sleeve, and the two support screws of the upper support sleeve and the two support screws of the lower support sleeve are symmetrically arranged relative to the splicing surface.

4. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, The upper support sleeve and the lower support sleeve are rotatably connected on one long axis side by a pivot.

5. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, Both the upper support sleeve and the lower support sleeve are provided with outwardly protruding connecting plates on one long axis side. Each connecting plate has a channel, and bolts are installed in the channel to achieve a detachable connection between the upper support sleeve and the lower support sleeve on one long axis side.

6. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, The outer diameter of the upper support sleeve is equal to the outer diameter of the lower support sleeve.

7. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, The rolls and the drum-shaped toothed shaft are pulled out by a roll changing trolley.

8. The method for quickly changing the drum-shaped geared shaft of a strip mill as described in claim 1, characterized in that, The drum-shaped toothed shaft includes an upper drum-shaped toothed shaft and a lower drum-shaped toothed shaft spaced apart, and the method includes replacing the lower drum-shaped toothed shaft without disassembling the upper drum-shaped toothed shaft.

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