Roll changing device for rolling mills

Abstract

The present application relates to rolling mill technical field, provide a kind of rolling mill roll changing device, including with the transverse moving track parallel to rolling direction, transverse moving frame is arranged on transverse moving track, transverse moving cylinder for driving transverse moving frame reciprocating motion along transverse moving track, upper fixed track is arranged in the side of transverse moving frame and parallel to roll axis, work roll push-pull mechanism is arranged on upper fixed track;Upper fixed track is below with parallel to it lower fixed track, and form transverse moving frame accommodating space between upper fixed track and lower fixed track;Lower fixed track is provided with reciprocatingly movable lifting mechanism thereon;Transverse moving track is installed on lifting mechanism.When work roll replacement is completed, transverse moving frame can be lowered to low position and moved into transverse moving frame accommodating space by lifting mechanism, to clear away support roll replacement space, shorten the replacement time of support roll, improve roll changing efficiency, solve the problem that support roll replacement time is long due to hoisting transverse cover plate in prior art.

Description

Technical Field

[0001] This invention relates to the field of rolling mill technology, and in particular to a rolling mill roll changing device. Background Technology

[0002] On hot-rolled strip steel production lines, to ensure product quality, the mill needs to be stopped after a certain period of rolling to replace the work rolls and support rolls. Currently, conventional hot strip rolling production lines are equipped with dedicated work roll and support roll replacement devices.

[0003] Work roll replacement is generally carried out on the transverse cover plate, using a combination of transverse movement and push-pull mechanisms. Transverse movement moves the work roll along the rolling direction, while push-pull movement moves it along the roll axis. Support roll replacement is performed after work roll replacement, typically using a support roll push-pull mechanism located at the bottom of the mill. However, during support roll replacement, the transverse cover plate obstructs the replacement space, requiring manual lifting of the cover plate using a crane. Therefore, this method suffers from disadvantages such as long replacement time, high manpower consumption, low safety, and space requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rolling mill roll changing device to improve roll changing efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a rolling mill roll changing device, including a transverse track parallel to the rolling direction, a transverse frame set on the transverse track, a transverse cylinder that drives the transverse frame to reciprocate along the transverse track, an upper fixed track set on one side of the transverse frame and parallel to the roll axis, and a work roll push-pull mechanism set on the upper fixed track.

[0006] A lower fixed rail is provided below the upper fixed rail, parallel to it, and a transverse frame accommodating space is formed between the upper fixed rail and the lower fixed rail; a lifting mechanism that can reciprocate on the lower fixed rail is provided; the transverse rail is installed on the lifting mechanism.

[0007] Furthermore, the transverse track includes a lifting section track positioned opposite the fixed track, and a fixed section track positioned at one or both ends of the lifting section track; the lifting section track is mounted on the lifting mechanism; the transverse frame includes a first transverse frame body positioned on the lifting section track, and a second transverse frame body positioned on the fixed section track.

[0008] Furthermore, the first transverse frame is connected to the second transverse frame via a quick-connect structure; the quick-connect structure includes a slot at the bottom of the second transverse frame and a locking block on the second transverse frame that engages with the slot.

[0009] Furthermore, the lifting mechanism includes a lifting platform for mounting the transverse rail, with at least two support frames hinged below the lifting platform for placement on the lower fixed rail, and a connecting rod extending along the direction of the roll axis hinged between adjacent support frames, and a lifting hydraulic cylinder hinged between one of the support frames and the lifting platform.

[0010] Furthermore, the bottom of the support frame is provided with rollers for rolling cooperation with the lower fixed track.

[0011] Furthermore, two limiting blocks are installed on the top of the lifting platform; the transverse track is located between the two limiting blocks.

[0012] Furthermore, a positioning block is installed at the bottom of the lifting platform.

[0013] Furthermore, the upper fixed track includes a front track and a rear track; the front track is close to the transverse frame and forms a transverse frame accommodating space between the front track and the lower fixed track.

[0014] Furthermore, several support beams are provided below the front track to support it; the support beams are parallel to the rolling direction and have supports installed at both ends.

[0015] The beneficial effects of the present invention are as follows: The rolling mill roll changing device provided by the embodiments of the present invention can lower the transverse frame to a low position and move it into the transverse frame accommodating space through the lifting mechanism after the work roll is changed, thereby opening up the space for changing the support roll, greatly shortening the replacement time of the support roll, improving the roll changing efficiency, and solving the problem of long support roll replacement time caused by hoisting the transverse cover plate in the prior art. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a state diagram of the transverse shifter in the rolling mill roll changing device provided in this embodiment of the invention when it is in a high position;

[0018] Figure 2 This is a state diagram of the rolling mill roll changing device provided in this embodiment of the invention, where the transverse shifter is in a low position and located within the transverse shifter accommodating space;

[0019] Figure 3 This is a structural diagram of the transverse track and transverse frame;

[0020] Figure 4 This is a structural diagram of the lifting mechanism;

[0021] Figure 5 This is a schematic diagram of the structure of the fixed upper track;

[0022] Figure 6 This is a status diagram during work roll replacement;

[0023] Figure 7 This is a diagram showing the state of the old and new work rolls on the transverse frame;

[0024] Figure 8 This is a diagram showing the state of the support rollers during replacement.

[0025] The attached diagram is labeled as follows: 1-Transverse track, 2-Transverse frame, 3-Transverse cylinder, 4-Upper fixed track, 5-Working roller push-pull mechanism, 6-Lower fixed track, 7-Transverse frame accommodating space, 8-Lifting mechanism, 9-Lifting section track, 10-Fixed section track, 11-First transverse frame body, 12-Second transverse frame body, 13-Slot, 14-Slot block, 15-Lifting platform, 16-Support frame, 17-Connecting rod, 18-Lifting hydraulic cylinder, 19-Roller, 20-Limit block, 21-Positioning block, 22-Front track, 23-Rear track, 24-Support beam, 25-Support, 26-Support roller push-pull cylinder, 27-Lower step pad frame, 28-New working roller, 29-Old working roller, 30-Frame, 31-Lower support roller, 32-Roll changing bracket, 33-Upper support roller. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, it will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0027] See Figure 1 , Figure 2 An embodiment of the present invention provides a rolling mill roll changing device, including a transverse track 1 parallel to the rolling direction, a transverse frame 2 disposed on the transverse track 1, a transverse cylinder 3 driving the transverse frame 2 to reciprocate along the transverse track 1, an upper fixed track 4 disposed on one side of the transverse frame 2 and parallel to the roll axis, and a work roll push-pull mechanism 5 disposed on the upper fixed track 4; a lower fixed track 6 parallel to the upper fixed track 4 is disposed below the upper fixed track 4, and a transverse frame accommodating space 7 is formed between the upper fixed track 4 and the lower fixed track 6; a lifting mechanism 8 that can reciprocate on the lower fixed track 6 is disposed thereon; and the transverse track 1 is mounted on the lifting mechanism 8.

[0028] The transverse track 1 is arranged parallel to the rolling direction and provides support and guidance for the transverse frame 2. The transverse frame 2 is rolled on the transverse track 1 to support the work roll and drive it to move along the rolling direction. The transverse cylinder 3 is a pneumatic or hydraulic cylinder used to drive the transverse frame 2 to reciprocate on the transverse track 1. The upper fixed track 4 is arranged parallel to the roll axis and provides support and guidance for the work roll push-pull mechanism 5. The work roll push-pull mechanism 5 is an existing structure, which is set on the upper fixed track 4 and can move on the upper fixed track 4 to push and pull the work roll along the roll axis as a power component.

[0029] The lower fixed track 6 is arranged parallel to the roller axis and fixed below the upper fixed track 4; a transverse frame receiving space 7 is formed between the lower fixed track 6 and the upper fixed track 4 to accommodate the transverse frame 2. The lifting mechanism 8 is slidably or rollingly arranged on the lower fixed track 6, which supports and guides the lifting mechanism 8; under the action of external power, the lifting mechanism 8 can move along the lower fixed track 6. The transverse track 1 is installed on the lifting mechanism 8, and the height of the transverse track 1 can be adjusted by the lifting mechanism 8.

[0030] This invention provides a rolling mill roll changing device that can be arranged close to the operating side of the rolling mill, ensuring effective roll changing time, reducing rolling line downtime, and improving rolling line efficiency. During roll changing, the lifting mechanism 8 drives the transverse frame 2 to a high position, ensuring the top of the transverse frame 2 is flush with the upper fixed track 4. Figure 1 As shown; then, under the combined action of the transverse cylinder 3 and the working roller push-pull mechanism 5, the work roller replacement can be completed on the transverse frame 2. After the work roller replacement is completed, the transverse frame 2 is driven to a low position by the lifting mechanism 8, so that the top of the transverse frame 2 forms a height difference with the upper fixed track 4; then the lifting mechanism 8 is controlled to move towards the transverse frame receiving space 7 on the lower fixed track 6, and then the transverse frame 2 is moved into the transverse frame receiving space 7 below the upper fixed track 4 by the lifting mechanism 8, so as to make way for the support roller replacement space on the left side of the upper fixed track 4, and avoid the transverse frame 2 blocking the replacement of the support roller, as shown. Figure 2 As shown; this allows the replacement of the support rollers to be completed using existing methods.

[0031] The present invention provides a rolling mill roll changing device that can meet the needs of rolling mill for rapid replacement of work rolls and support rolls. While ensuring the effective replacement time of work rolls, it solves the problem of long replacement time of support rolls caused by the hoisting and transverse movement of cover plates in the prior art, thereby improving the roll changing efficiency.

[0032] In the above embodiments, when replacing the support rollers, the entire transverse track 1 and transverse frame 2 need to be moved into the transverse frame accommodating space 7 in order to make room for the replacement of the support rollers. This results in a large amount of civil engineering foundation construction, heavy equipment weight, a large number of spare parts, and a large investment cost.

[0033] As a preferred embodiment, see [link to previous document]. Figure 3 The transverse track 1 includes a lifting section track 9 directly opposite the fixed track 4, and fixed section tracks 10 located at one or both ends of the lifting section track 9; the lifting section track 9 is mounted on the lifting mechanism 8; the transverse frame 2 includes a first transverse frame body 11 located on the lifting section track 9, and a second transverse frame body 12 located on the fixed section track 10. For simplified viewing, the lifting section track 9 is not shown in the diagram. Figure 3 As shown in the figure, while Figure 4 As shown in the image.

[0034] This invention provides a rolling mill roll changing device. The transverse track 1 is configured as a lifting section track 9 and a fixed section track 10, and the transverse frame 2 is configured as a first transverse frame 11 and a second transverse frame 12. After the work roll is changed, the lifting mechanism 8 drives the lifting section track 9 and the first transverse frame 11 to a low position, creating a height difference between the top of the first transverse frame 11 and the upper fixed track 4. Then, the lifting mechanism 8 is controlled to move towards the transverse frame accommodating space 7 on the lower fixed track 6, thereby moving the first transverse frame 11 into the transverse frame accommodating space 7 below the upper fixed track 4, thus freeing up space for the support roll changing. This eliminates the need to move the entire transverse track 1 and transverse frame 2 into the transverse frame accommodating space 7, significantly reducing the amount of civil engineering foundation construction, the size and weight of the lifting mechanism 8, the number of spare parts, and the investment cost.

[0035] When the working roller is replaced, the lifting section track 9 should be raised by the lifting mechanism 8 and aligned with the fixed section track 10. At this time, the first transverse frame 11 and the second transverse frame 12 need to be connected together so that the transverse cylinder 3 can drive the first transverse frame 11 and the second transverse frame 12 to move simultaneously.

[0036] In this embodiment, the first transverse frame 11 is connected to the second transverse frame 12 via a quick-connect structure. The quick-connect structure includes a slot 13 at the bottom of the second transverse frame 12 and a locking block 14 on the second transverse frame 12 that engages with the slot 13. During operation, when the first transverse frame 11 moves upward to a position at the same height as the second transverse frame 12, the locking block 14 on the first transverse frame 11 engages precisely in the slot 13 at the bottom of the second transverse frame 12, thus connecting the first transverse frame 11 and the second transverse frame 12 together. When the first transverse frame 11 moves downward, the locking block 14 on the first transverse frame 11 disengages from the slot 13 at the bottom of the second transverse frame 12, thereby separating the first transverse frame 11 from the second transverse frame 12.

[0037] See Figure 4 The lifting mechanism 8 includes a lifting platform 15 for mounting the transverse rail 1. At least two support frames 16 are hinged to the lower part of the lifting platform 15 for placement on the lower fixed rail 6. A connecting rod 17 extending along the direction of the roll axis is hinged between adjacent support frames 16. A lifting hydraulic cylinder 18 is hinged between one of the support frames 16 and the lifting platform 15.

[0038] The lifting platform 15 is a horizontally arranged frame structure, and the lifting section rail 9 is installed on the top of the lifting platform 15. Two, three, or more support frames 16 are arranged below the lifting platform 15, all of which are evenly spaced along the roll axis. The upper end of each support frame 16 is hinged to the lifting platform 15 via a first rotating shaft parallel to the rolling direction, allowing the support frame 16 and the lifting platform 15 to rotate relative to the first rotating shaft. The lower end of each support frame 16 is supported on a lower fixed rail 6 and can move along the lower fixed rail 6. A connecting rod 17 parallel to the roll axis is provided between adjacent support frames 16. The two ends of the connecting rod 17 are respectively hinged to the support frame 16 via a second rotating shaft parallel to the rolling direction, allowing the support frame 16 and the connecting rod 17 to rotate relative to the second rotating shaft. This forms a parallelogram-shaped linkage mechanism between the support frames 16, the connecting rods 17, and the lifting platform 15. The cylinder body of the lifting hydraulic cylinder 18 is hinged to the lifting platform 15, and the piston rod of the lifting hydraulic cylinder 18 is hinged to one of the support frames 16. The lifting hydraulic cylinder 18 is used to lock the lifting platform 15 at a certain height. By controlling the extension or retraction of the piston rod of the lifting hydraulic cylinder 18, the height of the lifting platform 15 can be adjusted.

[0039] The lifting mechanism 8 of this embodiment of the invention, by setting up a parallelogram-shaped linkage mechanism formed by the support frame 16, connecting rod 17, and lifting platform 15, not only ensures the strength and rigidity of the mechanism but also reduces the installation space occupied by the entire mechanism. Furthermore, only a single hydraulic cylinder is needed to drive the normal operation of the entire mechanism, reducing investment in the hydraulic system and simplifying electrical control. Of course, in other embodiments, the lifting mechanism 8 can also be other existing structures, which are not specifically limited here.

[0040] To reduce the friction between the support frame 16 and the lower fixed track 6, preferably, the bottom of the support frame 16 is provided with rollers 19 for rolling cooperation with the lower fixed track 6. To limit the first transverse frame 11 along the direction of the roll axis, preferably, two limiting blocks 20 are installed on the top of the lifting platform 15; the transverse track 1 is located between the two limiting blocks 20; thus, when the first transverse frame 11 is placed on the lifting section track 9 of the transverse track 1, the two limiting blocks 20 limit the two sides of the first transverse frame 11.

[0041] See Figure 4 The bottom of the lifting platform 15 is equipped with a positioning block 21. When the lifting platform 15 is lowered to the lowest position, the positioning block 21 at the bottom of the lifting platform 15 is exactly located in the positioning groove in the support roller changing device. In this way, the support roller changing device can be used as a power component to drive the lifting platform 15 to move on the lower fixed track 6 without the need for an additional power component, thus saving manufacturing costs.

[0042] See Figure 5 The upper fixed track 4 includes a front track 22 and a rear track 23. The front track 22 is close to the transverse frame 2, forming a transverse frame accommodating space 7 between the front track 22 and the lower fixed track 6. During construction, the rear track 23 is fixed to the ground foundation, the area below the front track 22 is excavated, and the front track 22 is supported by a support structure. This way, the transverse frame accommodating space 7 is only formed below the front track 22, which can greatly reduce the amount of foundation excavation and lower construction costs. In this embodiment, several support beams 24 are provided below the front track 22 to support it; the support beams 24 are parallel to the rolling direction, and supports 25 are installed at both ends.

[0043] The following is combined with Figures 6 to 8 The process of replacing the work rolls and support rolls of the rolling mill is explained.

[0044] See Figure 6The mill roll changing device provided in this embodiment of the invention is arranged on the operating side of the mill, wherein the upper fixed track 4 is positioned directly opposite the roll. A support roll changing device is installed, which includes a support roll push-pull cylinder 26 mounted on the lower fixed track 6 and movable on the lower fixed track 6, and a lower stepped pad frame 27 connected to the support roll push-pull cylinder 26. Preparations for changing the work roll and support roll are completed inside the mill.

[0045] Replace the work roll:

[0046] See Figure 6 , Figure 7 The lifting mechanism 8 holds the first transverse frame 11 in a high position and aligns it with the upper fixed track 4. The new work roll 28 is placed on the upper fixed track 4, and the work roll push-pull mechanism 5 pushes the new work roll 28 onto the first transverse frame 11. The transverse cylinder 3 is activated, pushing the first transverse frame 11 and the new work roll 28 to the mill exit side and aligning the second transverse frame 12 with the upper fixed track 4. The work roll push-pull mechanism 5 pulls the old work roll 29 out of the frame 30 onto the second transverse frame 12. The transverse cylinder 3 is activated again, realigning the first transverse frame 11 with the upper fixed track 4, and the work roll push-pull mechanism 5 pushes the new work roll 28 into the frame 30.

[0047] Replace the support rollers:

[0048] See Figure 6 The lower support roller 31 within the frame 30 is supported on the lower stepped pad frame 27. (See also...) Figure 8After the working roller is replaced, the lifting mechanism 8 drives the first transverse frame 11 to descend, so that the first transverse frame 11 is separated from the second transverse frame 12. When the lifting mechanism 8 descends to the low position, the positioning block 21 at the bottom of the lifting platform 15 is locked in the positioning groove on the support roller push-pull cylinder 26. The support roller push-pull cylinder 26 is activated, pulling the lower support roller 31 out of the frame 30 through the lower stepped pad frame 27, and at the same time pulling the lifting mechanism 8 and the first transverse frame 11 into the transverse frame receiving space 7 below the upper fixed track 4. The roller changing bracket 32 ​​is placed on the lower support roller 31, and the support roller push-pull cylinder 26 is activated, pulling the lower support roller 31 out of the frame 30 through the lower stepped pad frame 27. 1. Push the lower support roller 31, the roller changing bracket 32 ​​together into the frame 30, and at the same time push the lifting mechanism 8 and the first transverse frame 11 outside the transverse frame accommodating space 7; place the upper support roller 33 on the roller changing bracket 32, and the support roller push-pull cylinder 26 continues to operate, pulling the lower support roller 31, the roller changing bracket 32 ​​and the upper support roller 33 together out of the frame 30 through the lower step pad frame 27, and at the same time pull the lifting mechanism 8 and the first transverse frame 11 into the transverse frame accommodating space 7 below the upper fixed track 4; then the old support roller can be lifted away and replaced with a new support roller, and the new support roller is pushed into the frame 30 by the cooperation of the lower step pad frame 27 and the support roller push-pull cylinder 26.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rolling mill roll changing device, comprising a transverse track (1) parallel to the rolling direction, a transverse frame (2) disposed on the transverse track (1), a transverse cylinder (3) for driving the transverse frame (2) to reciprocate along the transverse track (1), an upper fixed track (4) disposed on one side of the transverse frame (2) and parallel to the roll axis, and a work roll push-pull mechanism (5) disposed on the upper fixed track (4); Its features are, Below the upper fixed track (4) is a lower fixed track (6) parallel to it, and a transverse frame accommodating space (7) is formed between the upper fixed track (4) and the lower fixed track (6); a lifting mechanism (8) that can reciprocate on the lower fixed track (6) is provided; the transverse track (1) is installed on the lifting mechanism (8). The transverse track (1) includes a lifting section track (9) facing the upper fixed track (4) and a fixed section track (10) at one or both ends of the lifting section track (9); the lifting section track (9) is installed on the lifting mechanism (8); the transverse frame (2) includes a first transverse frame body (11) set on the lifting section track (9) and a second transverse frame body (12) set on the fixed section track (10).

2. The rolling mill roll changing device according to claim 1, characterized in that, The first transverse frame (11) is connected to the second transverse frame (12) via a quick-connect structure; the quick-connect structure includes a slot (13) at the bottom of the second transverse frame (12) and a block (14) on the second transverse frame (12) that cooperates with the slot (13).

3. The rolling mill roll changing device according to claim 1 or 2, characterized in that, The lifting mechanism (8) includes a lifting platform (15) for mounting the transverse rail (1), and at least two support frames (16) for placing on the lower fixed rail (6) are hinged below the lifting platform (15). A connecting rod (17) extending along the direction of the roll axis is hinged between adjacent support frames (16), and a lifting hydraulic cylinder (18) is hinged between one of the support frames (16) and the lifting platform (15).

4. The rolling mill roll changing device according to claim 3, characterized in that, The bottom of the support frame (16) is provided with rollers (19) for rolling cooperation with the lower fixed track (6).

5. The rolling mill roll changing device according to claim 3, characterized in that, The top of the lifting platform (15) is equipped with two limiting blocks (20); the transverse track (1) is located between the two limiting blocks (20).

6. The rolling mill roll changing device according to claim 3, characterized in that, The bottom of the lifting platform (15) is equipped with a positioning block (21).

7. The rolling mill roll changing device according to claim 1, characterized in that, The upper fixed track (4) includes a front track (22) and a rear track (23); the front track (22) is close to the transverse frame (2) and forms a transverse frame accommodating space (7) between the front track (22) and the lower fixed track (6).

8. The rolling mill roll changing device according to claim 7, characterized in that, Several support beams (24) are provided below the front track (22) to support it; the support beams (24) are parallel to the rolling direction and are equipped with supports (25) at both ends.

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