Device and method for quickly replacing supporting roll of rolling mill

Abstract

The invention relates to a quick replacement device and method for a rolling mill supporting roll, and belongs to the technical field of rolling mill roll replacement in the metallurgical industry. According to the technical scheme, two stand columns (022) are fixed to a base (021) respectively, and the two stand columns (022) are connected together through a connecting transverse pipe (023); the base frame (201) is fixed on a base (021) in the roll changing support (1), a V-shaped sliding block (3) matched with the V-shaped track (011) and a smooth block (4) matched with the working roll flat track (012) are arranged below the base frame (201), and the V-shaped track (011) and the working roll flat track (012) form a working roll track (01). The conveying device has the beneficial effects that the conveying operation of the roller replacing support can be completed under the condition that the lower supporting roller of the rolling mill is not pulled and pushed in a limited space, the roller replacing support does not need to be conveyed by frequently pulling and pushing the lower supporting roller, and rapid replacement of the supporting roller of the rolling mill is completed.

Description

Technical Field

[0001] The invention relates to a device and method for quickly replacing support rolls of a rolling mill, belonging to the technical field of rolling mill roll replacement in the metallurgical industry. Background Art

[0002] The rolling mill backup roll is used to support the working roll to prevent the working roll from bending and deformation, which affects the output and quality of plates and strips. It is one of the key equipment of the hot rolling and wide medium and thick plate production line rolling mill. In order to control the rolling accuracy and ensure the product quality, the backup roll needs to be replaced after a period of rolling. Due to the large diameter and heavy weight of the backup roll, the replacement procedure is relatively cumbersome.

[0003] See attached Fig.15 The steps for replacing the support rolls of a rolling mill are usually as follows: (1) After stopping the machine and pulling out the working rolls, open the transverse platform and pull out the lower support roll 04; (2) hoist the support roll changing bracket 02 onto the bearing seat of the lower support roll, and adjust the position so that the positioning key 041 on the lower support roll coincides with the key slot 0211 of the changing bracket; (3) push in the lower support roll with the changing bracket; (4) lower the upper support roll 05 onto the changing bracket, pull out the upper and lower support rolls and lift them off, replace them with new upper and lower support rolls and push them in, and lift the upper support roll to separate it from the changing bracket; (5) pull out the lower support roll; (6) lift off the tooling; (7) push in the lower support roll and perform subsequent recovery operations.

[0004] The original roll-changing support 02 is mainly composed of a base 021, a column 022, a connecting transverse pipe 023 and a connecting vertical pipe 024, and is mainly used to support the upper supporting roller so that the upper supporting roller can be pulled out together with the lower supporting roller. Since the roll-changing support cannot be directly placed between the upper and lower supporting rollers in the rolling mill window, it is necessary to frequently pull out and push down the supporting rollers, and use the lower supporting rollers to transport the roll-changing support. Frequent pulling out and pushing down of the supporting rollers causes the bearing seat of the supporting rollers to be subjected to stress multiple times, and its internal bearings, locking devices, etc. are subjected to multiple axial impact loads, which has a certain impact on its service life. The roll-changing support and the lower supporting roller bearing seat are positioned and constrained by positioning keys, and the hoisting operation is not easy to operate and position, with low precision and long time consumption. At the same time, the hoisting operation of the roll-changing support is usually carried out at the edge of the roll-changing pit, which poses a safety hazard to the operators. Pulling out and pushing down the supporting rollers to transport the roll-changing support and the hoisting, positioning and lifting operation of the roll-changing support and the lower supporting rollers are time-consuming, affecting the maintenance efficiency. Therefore, a new technical solution is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for quickly replacing the supporting rolls of a rolling mill, which can complete the transportation operation of the roll changing bracket in a confined space without pulling out or pushing the lower supporting rolls of the rolling mill, and can complete the rapid replacement of the supporting rolls of the rolling mill without frequently pulling out and pushing the lower supporting rolls to transport the roll changing bracket, thereby solving the problems existing in the background technology.

[0006] The technical solution of the present invention is: A device for quickly replacing supporting rolls of a rolling mill comprises a roll changing support, a mobile frame, a V-shaped slider and a flat slider, wherein the roll changing support comprises a base, a column and a connecting cross pipe, two columns are respectively fixed on the base, and the two columns are connected together by a connecting cross pipe; the mobile frame comprises a pedestal and a towing hook fixed on the pedestal, the pedestal is fixed on the base in the roll changing support, a V-shaped slider matched with the V-shaped track and a smooth block matched with the working roll flat track are arranged under the pedestal, and the V-shaped track and the working roll flat track constitute the working roll track.

[0007] The V-shaped slider and the flat slider are respectively fixed to the bottom of the base frame of the moving frame by locking bolts to form a moving trolley.

[0008] The base frame is a U-shaped structure, with an internal threaded hole A at the bottom of the base frame, a pin shaft and a positioning baffle at the top of the base frame, an internal threaded hole B at the top of the pin shaft, and a height of the positioning baffle higher than a height of the pin shaft.

[0009] The V-shaped slider and the flat slider are both rectangular parallelepiped structures. The V-shaped slider and the flat slider are respectively provided with countersunk through holes matching the internal threaded holes A on the base frame, and a V-shaped notch is provided below the V-shaped slider.

[0010] The V-shaped slider and the flat slider are respectively provided with guide angles matching with the working roller tracks on both sides.

[0011] A protruding support plate is provided below the base, and a base frame in the mobile frame is fixed on the protruding support plate.

[0012] A rectangular boss is provided below the protruding support plate, and the rectangular boss is located above the working roller track and in contact with the base frame.

[0013] A circular through hole is arranged above the protruding supporting plate.

[0014] The width of the rectangular boss is smaller than the width of the protruding support plate.

[0015] A method for quickly replacing a rolling mill support roll adopts the rolling mill support roll quick replacement device defined above and is operated according to the following steps: (1) Push in the roller changing bracket Lift the roll-changing support and the mobile trolley onto the transverse platform as a whole, stop the machine and extract the working rolls, move the transverse platform, and push the mobile trolley with the roll-changing support into the mill window; (2) Pull out the mobile cart Lift the lower support roller to align the positioning key on the lower support roller with the keyway of the roller-changing bracket, continue to lift the lower support roller to lift the roller-changing bracket and separate it from the pin shaft on the moving trolley, and pull the moving trolley out to the transverse platform; (3) Replace the upper and lower rollers: The lower support roller is lowered to the original position, the upper support roller is lowered to the roller changing bracket, the transverse platform is opened, the upper and lower support rollers are pulled out and lifted off, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to separate from the roller changing bracket; (4) Pull out the roller changing bracket Lift the lower supporting roller, move the transverse platform and push the mobile trolley into the rolling mill window, so that the positioning baffle on the mobile frame contacts the protruding support plate on the outside of the roll changing bracket. At this time, the circular through hole of the protruding support plate of the roll changing bracket coincides with the pin shaft on the mobile trolley. Lower the lower supporting roller so that the roll changing bracket falls on the mobile trolley and pull the mobile trolley out of the window.

[0016] The beneficial effects of the present invention are: the conveying operation of the roll changing support can be completed without pulling out or pushing the lower support roll of the rolling mill in a confined space, and the roll changing support can be quickly replaced without frequently pulling out or pushing the lower support roll. The number of times the lower support roll is pulled out or pushed is reduced, the number of times the roll changing support is hoisted is reduced, the time for replacing the support roll and the maintenance operation is effectively reduced, and the axial impact force on the support roll assembly is reduced. The present invention has the advantages of simple structure, low manufacturing cost, convenient operation, safety and reliability, and can effectively improve the efficiency of the replacement and maintenance operation of the support roll of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a structural schematic diagram of the roller changing bracket; Figure 3 It is a structural schematic diagram of a mobile frame; Figure 4 for Figure 3 Enlarged image at the center X; Figure 5 It is a structural schematic diagram of a V-shaped slider; Figure 6 It is a structural diagram of a smooth block; Figure 7 It is a structural diagram of the mobile car; Figure 8 is a schematic diagram of the structure of the locking bolt; Fig. 9 Schematic diagram of the internal structure of the rolling mill window Fig.10 This is a schematic diagram of the present invention working inside the rolling mill window Fig.11 Schematic diagram of the roller changing bracket of the present invention being pushed into place / prepared to be pulled out Fig.12 This is a schematic diagram of the disengagement / assembly of the roller changing bracket and the pin shaft of the present invention; Fig.13 This is a schematic diagram of the present invention's pull-out / push-in mobile trolley; Fig.14 This is a schematic diagram of pulling out / pushing in the roller changing bracket of the present invention; Fig.15 It is a schematic diagram of the structure of the upper support roller, the lower support roller, and the original roller replacement bracket; In the figure: 01-working roller track, 011-working roller V-shaped track, 012-working roller flat track; 02-original roller changing bracket, 021-base, 0211-keyway of roller changing bracket, 022-upright column, 023-connecting horizontal pipe, 024-connecting vertical pipe; 03-working roll cooling water beam; 04-lower support roll, 041-positioning key; 05-upper support roll; 1-roller changing bracket, 101-protruding support plate, 102-rectangular boss, 103-circular through hole, 104-rectangular notch, 105-reinforcement rib; 2-mobile frame, 201-base frame, 202-tow hook, 203-connecting rib, 204-internal thread hole A, 205-guide angle, 206-pin shaft, 207-internal thread hole B, 208-positioning baffle; 3-V-shaped slider, 301-V-shaped notch, 302-countersunk through hole, 303-guide angle; 4-smooth block, 401-countersunk through hole, 402-guide angle; 5-locking bolt, 501-screw, 502-washer, 503-anti-slip knurling. DETAILED DESCRIPTION

[0018] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0019] Refer to the attached Figure 1-15 A device for quickly replacing supporting rolls of a rolling mill comprises a roll changing support 1, a movable frame 2, a V-shaped slider 3 and a flat slider 4, wherein the roll changing support 1 comprises a base 021, a column 022 and a connecting cross pipe 023, two columns 022 are respectively fixed on the base 021, and the two columns 022 are connected together by the connecting cross pipe 023; the movable frame 2 comprises a base frame 201 and a towing hook 202 fixed on the base frame 201, the base frame 201 is fixed on the base 021 in the roll changing support 1, a V-shaped slider 3 matched with the V-shaped track 011 and a smooth block 4 matched with the working roll flat track 012 are arranged under the base frame 201, and the V-shaped track 011 and the working roll flat track 012 constitute the working roll track 01.

[0020] In this embodiment, if Figure 1-8 As shown, the device comprises a roller changing bracket 1, a moving frame 2, a V-shaped slider 3, a sliding block 4 and a locking bolt 5, wherein: A protruding support plate 101 is provided at the lower end of the roll changing bracket 1, and a rectangular boss 102 is provided below the protruding support plate 101, whose width is smaller than the width of the protruding support plate 101 and is consistent with the working roll track 01, a circular through hole 103 is provided above the protruding support plate 101, and a guide angle is provided below the circular through hole 103, rectangular notches 104 are provided on both sides of the base at the lower end of the roll changing bracket 1, and a triangular reinforcing rib 105 is provided at the lower end of the roll changing bracket 1, and other structures are consistent with the original roll changing bracket 02 structure.

[0021] The mobile frame 2 is composed of a base frame 201, a towing hook 202 and a connecting rib 203. Internal threaded holes A204 are provided at both ends of the lower side of the base frame 201, a guide angle 205 is provided at the front end of the base frame 201, pins 206 are provided at both ends of the upper side of the base frame 201, and an internal threaded hole B207 is provided above the pin 206. A positioning baffle 208 is provided at the rear end of the upper side of the base frame 201. The width of the positioning baffle 208 is consistent with the upper end surface of the base frame 201, and its height is higher than the height of the pin 206. The towing hook 202 is consistent with the working roll towing hook structure in the roll changing system.

[0022] The V-shaped slider 3 is configured as a cubic structure as a whole, with a V-shaped groove 301 provided at the bottom, whose size and angle match the working roller V-shaped track 011, the width of the V-shaped slider 3 is consistent with the width of the working roller V-shaped track 011, the V-shaped slider 3 is provided with countersunk through holes 302, whose size and spacing match the internal threaded holes A204 on the base frame 201, and guide angles 303 are provided on both sides of the V-shaped slider 3.

[0023] The smooth block 4 is a cubic structure as a whole, and its width is consistent with the width of the working roller flat track 012. It is provided with a countersunk through hole 401, whose size and spacing match the internal threaded hole A204 on the base frame 201, and guide angles 402 are provided on both sides of the smooth block 4.

[0024] The V-shaped slider 3 and the smooth block 4 are respectively fixed to the bottom of the base frame 201 of the moving frame 2 by hexagon socket bolts, and match with the original working roller track 01. The moving frame 2, the V-shaped slider 3 and the smooth block 4 are combined to form a moving trolley. The moving trolley can slide along the working roller track 01. The guide angle 205 of the base frame 201, the guide angle 303 of the V-shaped slider 3 and the guide angle 402 of the smooth block 4 are used for smooth transition when the moving trolley slides on the working roller track 01, so as to avoid jamming caused by deviation at the interface of the working roller track 01.

[0025] The locking bolt 5 is composed of a bolt and a gasket. A screw rod 501 is provided at the front end, and the screw rod 501 can form a threaded connection with the internal threaded hole B207 of the movable frame 2. A washer 502 is provided in the middle. The outer diameter of the washer 502 is larger than the diameter of the circular through hole 103 of the roller changing bracket 1, and an anti-slip knurling 503 is provided at the rear end.

[0026] The roll-changing bracket 1 is installed above the moving trolley, and is constrained and positioned by the pin 206 and the positioning baffle 208, and fixed by the locking bolt 5. The V-shaped slider 3 and the smooth block 4 of the moving trolley cooperate and constrain the positioning with the V-shaped track 011 and the flat track 012 of the working roll track respectively. The rectangular boss 102 of the roll-changing bracket 1 contacts the base frame 201 of the moving trolley and is located directly above the guide rail, so that the weight of the roll-changing bracket 1 is evenly distributed on the track, and the base frame 201 of the moving frame 2 is prevented from being deformed due to force deflection. The roll-changing bracket 1 and the moving trolley can be connected and driven with the towing hook 202 through the original working roll change drive device, so that it moves along the working roll track 01.

[0027] The internal structure diagram of the rolling mill window is as follows: Figure 9-10 As shown, a working roll cooling water beam 03 is provided in the rolling mill window, and the distance between the working roll cooling water beam 03 and the working roll track 01 is small. Considering the limited space, in order to avoid the interference between the roll changing support 1 and the working roll cooling water beam 03 during the movement, the sum of the thicknesses of the V-shaped slider 3 or the smooth block 4 and the movable frame 2 and the protruding support plate 101 above it in the vertical direction is less than or equal to the diameter of the working roll wheel. If the original base of the roll changing support 1 slightly interferes with the working roll cooling water beam 03, the interference parts on both sides of the original base of the roll changing support 1 can be removed to form a smaller rectangular notch 103. At the same time, in order to increase the strength of the roll changing support 1, a reinforcing rib 104 is added to the base of the roll changing support 1, so as to avoid the interference between the roll changing support 1 and the working roll cooling water beam 03 and other parts during the movement of the roll changing support 1.

[0028] After the roll changing bracket 1 is installed above the moving trolley, its bottom surface is higher than the bottom surface of the working roll track, that is, the bottom surface of the roll changing bracket 1 is higher than the two track connecting plates of the transverse platform, so that the roll changing bracket 1 does not interfere with the transverse platform during movement.

[0029] The roller changing bracket 1 can be raised and lowered along with the raising and lowering of the lower supporting roller 04. When the base of the roller changing bracket 1 contacts the bearing seat of the raised lower supporting roller 04, it can be raised and lowered along with the lower supporting roller 04, so that the circular through hole 103 of the roller changing bracket 1 is separated and matched with the pin shaft 206 of the moving trolley. With the auxiliary positioning of the positioning baffle 208, the movement of the roller changing bracket can be completed through the movement of the moving trolley and the raising and lowering of the lower supporting roller 04.

[0030] See also Figure 11-15 As shown, the replacement of the rolling mill support roll is carried out according to the following detailed steps (1) Push in the roller changing bracket Before stopping for maintenance, hoist the roll-changing support 1 and the mobile trolley onto the transverse platform as a whole and remove the locking bolts. After stopping and pulling out the working rolls, move the transverse platform and push the mobile trolley with the roll-changing support 1 into the mill window with the help of the original roll-changing drive device. (2) Pull out the mobile cart Operate the jog function to lift the lower support roller 04, and at the same time, fine-tune the position of the moving trolley, so that the positioning key 041 on the lower support roller 04 is aligned with the key slot 0211 of the roller-changing bracket, and continue to lift the lower support roller 04, so that the lower support roller 04 lifts the roller-changing bracket 1 and separates it from the pin shaft 206 on the moving trolley, and with the help of the original roller-changing drive device, the moving trolley is pulled out to the transverse platform; (3) Replace the upper and lower rollers The lower support roller 04 is lowered to the original position, the upper support roller 05 is lowered to the roller changing bracket 1, the transverse moving platform is opened, the upper and lower support rollers are pulled out and lifted off, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to separate from the roller changing bracket; (4) Pull out the roller changing bracket Lift the lower supporting roller 04, move the transverse platform and push the mobile trolley into the rolling mill window with the help of the original roll changing drive device, so that the positioning baffle 208 on the mobile frame contacts the protruding support plate 101 on the outer side of the roll changing bracket 1. At this time, the circular through hole 103 on the protruding support plate 101 coincides with the pin shaft 206 on the mobile trolley, lower the lower supporting roller 04, and make the roll changing bracket 1 fall on the mobile trolley. With the help of the original roll changing drive device, the mobile trolley is pulled out of the window, and subsequent recovery operations are performed; after the maintenance is completed or during the working interval, install the locking bolts 5 to connect the roll changing bracket 1 and the mobile trolley, and lift them away.

Claims

1. A rolling mill support roll quick replacement device, characterized in that: The invention comprises a roll changing support (1), a moving frame (2), a V-shaped slider (3) and a flat slider (4); the roll changing support (1) comprises a base (021), a column (022) and a connecting transverse tube (023); two columns (022) are respectively fixed on the base (021); the two columns (022) are connected together via the connecting transverse tube (023); the moving frame (2) comprises a base frame (201) and a towing hook (202) fixed on the base frame (201); the base frame (201) is fixed on the base (021) in the roll changing support (1); a V-shaped slider (3) matched with a V-shaped track (011) and a smooth block (4) matched with a working roller flat track (012) are arranged below the base frame (201); the V-shaped track (011) and the working roller flat track (012) constitute a working roller track (01).

2. A rolling mill support roll quick replacement device according to claim 1, characterized in that: The V-shaped slider (3) and the flat slider (4) are respectively fixed to the bottom of the base frame (201) of the moving frame (2) by means of locking bolts (5), thereby forming a moving trolley.

3. A rolling mill support roll quick replacement device according to claim 2, characterized in that: The base frame (201) is a U-shaped structure. An internal threaded hole A (204) is provided below the base frame (201). A pin shaft (206) and a positioning baffle (208) are provided above the base frame (201). An internal threaded hole B (207) is provided above the pin shaft (206). The height of the positioning baffle (208) is higher than the height of the pin shaft (206).

4. A rolling mill support roll quick replacement device according to claim 3, characterized in that: The V-shaped slider (3) and the flat slider (4) are both rectangular parallelepiped structures. The V-shaped slider (3) and the flat slider (4) are respectively provided with countersunk through holes matching the internal threaded holes A (204) on the base frame (201). A V-shaped notch (301) is provided below the V-shaped slider (3).

5. A rolling mill support roll quick replacement device according to claim 4, characterized in that: The V-shaped slider (3) and the flat slider (4) are respectively provided with guide angles matching the working roller track (01) on both sides.

6. The rolling mill support roll quick replacement device according to claim 1, characterized in that: A protruding support plate (101) is provided below the base (021), and a base frame (201) in the movable frame (2) is fixed on the protruding support plate (101).

7. A rolling mill support roll quick replacement device according to claim 6, characterized in that: A rectangular boss (102) is provided below the protruding support plate (101), and the rectangular boss (102) is located above the working roller track (01) and in contact with the base frame (201).

8. A rolling mill support roll quick replacement device according to claim 7, characterized in that: A circular through hole (103) is provided above the protruding support plate (101).

9. A rolling mill support roll quick replacement device according to claim 7, characterized in that: The width of the rectangular boss (102) is smaller than the width of the protruding support plate (101).

10. A method for quickly replacing a rolling mill support roll, characterized in that: The rolling mill support roll quick replacement device defined in claims 1 to 9 is used and operated according to the following steps: (1) Push in the roller changing bracket The roll changing support (1) and the moving trolley are hoisted onto the transverse platform as a whole, the machine is stopped and the working rolls are extracted, the transverse platform is moved, and the moving trolley with the roll changing support (1) is pushed into the rolling mill window; (2) Pull out the mobile cart Lift the lower support roller (04) so ​​that the positioning key (041) on the lower support roller (04) is aligned with the keyway (0211) of the roller changing bracket, and continue to lift the lower support roller (04) so ​​that the lower support roller (04) lifts the roller changing bracket (1) and separates it from the pin shaft (206) on the moving trolley, and pull the moving trolley out onto the transverse platform; (3) Replace the upper and lower rollers: The lower support roller (04) is lowered to the original position, the upper support roller (05) is lowered to the roller changing bracket (1), the transverse moving platform is opened, the upper and lower support rollers are pulled out and lifted off, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to be separated from the roller changing bracket (1); (4) Pull out the roller changing bracket The lower support roller (04) is lifted, the transverse platform is moved and the movable trolley is pushed into the rolling mill window, so that the positioning baffle (208) on the movable frame (2) contacts the outer protruding support plate (101) of the roll changing bracket (1), and the circular through hole (103) of the protruding support plate (101) of the roll changing bracket (1) coincides with the pin shaft (206) on the movable trolley. The lower support roller (04) is lowered, so that the roll changing bracket falls on the movable trolley, and the movable trolley is pulled out of the window.

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