Novel roller bending device of four-roller hot mill

Abstract

The invention provides a novel four-roll hot mill roll bending device which comprises a working roll, a supporting roll, a rack, an operation side fixing block, a transmission side fixing block, a roll shifting cylinder, an operation side moving block and a transmission side moving block, bearing seats of the working roll and the supporting roll are in contact connection through a base plate, a hydraulic cylinder acts on the bearing seat of the supporting roll and abuts against the base plate, and the base plate is in contact connection with the hydraulic cylinder. The operation side fixing block and the transmission side fixing block are fixedly installed on the machine frame, the roll shifting cylinder is installed on the operation side fixing block, and one end of the roll shifting cylinder is connected with the operation side fixing block. The operation side moving block is arranged on the operation side fixing block in a sliding mode and connected with the roll shifting cylinder through a locking pin shaft. The transmission side moving block is arranged on the transmission side fixed block in a sliding manner; and the operation side moving block and the transmission side moving block are connected with the working roll bearing seat through the bearing seat locking device. Roll bending control is carried out on the supporting roll and the working roll at the same time, the surface quality and the yield of the plate blank are improved, and the key effect is achieved on production and efficiency improvement of a steel mill.

Description

Technical Field

[0001] The invention relates to the technical field of steel hot rolling equipment, in particular to a novel four-roller hot rolling mill roll bending device. Background Art

[0002] A rolling mill is a device used to realize the metal rolling process. In a broad sense, it refers to the equipment that completes the entire process of rolling production. According to the number of rollers, rolling mills can be divided into two-roller, four-roller, six-roller, eight-roller, twelve-roller, eighteen-roller and other types. According to the arrangement of the rollers, rolling mills can be divided into "L" type, "T" type, "F" type, "Z" type and "S" type. Ordinary rolling mills are mainly composed of rollers, frames, roll gap adjustment devices, roll temperature adjustment devices, transmission devices, lubrication systems, control systems and roll removal devices.

[0003] Modern plate and strip rolling mills use a variety of means and methods to improve the roll gap convexity and control the plate shape. The hydraulic bending roll control method is widely used because of its advantages of easy online real-time control, ability to quickly change the roll gap shape, and strong plate shape control ability.

[0004] The existing Chinese invention patent application with application number 201010281795.X discloses a working roll bending device of a plate and strip rolling mill, which is fixedly arranged on the rolling mill frame, and the bending device is arranged at the two ends of the upper working roll and the lower working roll to support, balance and control the upper and lower working rolls, improve the convexity of the loaded roll gap between the upper and lower working rolls of the rolling mill, and control the plate shape. The bending device comprises: an archway, which is a frame body, and the columns on the left and right sides of the archway are respectively provided with a waist convex block convexly inwardly; an upper bending roll device, which can be slidably installed in the archway, which is located above the waist convex block, and the upper bending roll device is installed at both ends of the upper working roll; a lower bending roll device, which can be slidably installed in the archway, which is located below the upper bending roll device, and the lower bending roll device is installed at both ends of the lower working roll. The working roll bending device of the plate and strip rolling mill of the present invention can meet the working requirements of a large plate and strip rolling mill with a large opening, and has reliable rolling quality and a long service life.

[0005] The key to the plate shape control of the working roll bending device is to increase the bending force for dynamic flatness control. During the rolling process, the bending deformation of the working roll is adjusted by the bending force to achieve fast and effective control of the plate shape. Since the action point of the hydraulic bending force is at the roll neck of the roll, far away from the rolled product, the adjustment of the plate shape is subject to two limitations: one is the limitation of the working roll bearing strength and the roll neck strength, resulting in a significant lack of plate shape control ability; the other is that the bending of the roll mainly occurs on both sides of the roll body, and the control ability of the edge is insufficient. Summary of the invention

[0006] The invention provides a novel four-roll hot rolling mill roll bending device, which implements roll bending control on support rolls and working rolls at the same time, thereby improving the surface quality and yield rate of slabs.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The invention discloses a novel four-roll hot rolling mill bending device, comprising a working roll and a supporting roll, wherein the bearing seats of the working roll and the supporting roll are in contact with each other through a pad, and a hydraulic cylinder acts on the bearing seat of the supporting roll, and the hydraulic cylinder is supported on the pad.

[0009] By adopting the above scheme: by adding a pad between the bearing seats of the working roll and the support roll, the bearing seats of the working roll and the support roll are contacted and connected through the pad, and the support roll is bent by a hydraulic cylinder, the control ability of the working roll on the edge of the plate is enhanced, and the surface quality and yield rate of the slab are improved.

[0010] The present invention provides a novel four-roller hot rolling mill roll bending device. Further, the hydraulic cylinder is embedded in the bearing seat of the supporting roll.

[0011] By adopting the above solution: determine the installation position of the hydraulic cylinder and ensure the stability of the installation.

[0012] The present invention discloses a novel roll bending device for a four-roll hot rolling mill. Furthermore, a roll bending cylinder is provided at the end of the working roll for performing roll bending operation on the working roll.

[0013] By adopting the above solution: bending control is implemented on the support roll and the working roll at the same time, the surface quality and yield rate of the slab are improved.

[0014] The present invention discloses a novel four-roll hot rolling mill roll bending device, further comprising a frame, an operating side fixed block, a transmission side fixed block, a roll shifting cylinder, an operating side moving block and a transmission side moving block, wherein the operating side fixed block and the transmission side fixed block are fixedly mounted on the frame, the roll shifting cylinder is mounted on the operating side fixed block, and one end of the roll shifting cylinder is connected to the operating side fixed block;

[0015] The operating side moving block is slidably arranged on the operating side fixed block and is connected to the roller shifting cylinder through a locking pin shaft; the transmission side moving block is slidably arranged on the transmission side fixed block;

[0016] The operating side moving block and the transmission side moving block are both connected to the working roll bearing seat through a bearing seat locking device.

[0017] By adopting the above scheme: by setting a roll shifting device, the relative position of the working rolls is changed, and the plate shape control ability of the working rolls is improved.

[0018] The invention discloses a novel four-roller hot rolling mill roll bending device. Furthermore, the sliding surfaces of the operating side moving block and the transmission side moving block are inlaid with self-lubricating slide plates.

[0019] By adopting the above solution: the sliding ability of the moving block is improved.

[0020] The present invention discloses a novel four-roll hot rolling mill roll bending device. Furthermore, the roll bending cylinder is arranged inside the operating side moving block and the transmission side moving block, and the roll bending cylinder is supported on the bearing seat of the working roll.

[0021] By adopting the above solution, the bending roll cylinder is integrated into the moving block, which reduces the occupied space and makes it more applicable.

[0022] The present invention provides a novel four-roller hot rolling mill roll bending device. Furthermore, the operating side moving block and the transmission side moving block are connected to the frame through a balancing block locking cylinder.

[0023] By adopting the above scheme: when the roller is shifting, the balancing block locking cylinder is unlocked, and when the roller is not shifting, the balancing block locking cylinder is locked, so that the positions of the moving block and the frame are fixed.

[0024] The present invention discloses a novel four-roll hot rolling mill roll bending device. Furthermore, the roll shifting cylinder is connected to a hydraulic servo system and a displacement sensor, and the extension and contraction amount of the roll shifting cylinder is controlled by the hydraulic servo system and the displacement sensor.

[0025] By adopting the above solution: the extension and contraction amount of the roller cylinder is controlled by a hydraulic servo system and a displacement sensor, and digital control is performed with higher precision.

[0026] The present invention discloses a novel four-roll hot rolling mill roll bending device. Furthermore, the frame is provided with stoppers for positioning an operating side fixing block and a transmission side fixing block. The operating side fixing block and the transmission side fixing block are both fastened to the inner side surface of the frame by bolts.

[0027] By adopting the above solution, the installation accuracy and installation stability of the fixing block are guaranteed.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By setting up a support roll bending device, a force opposite to that of the working roll is applied to enhance the working roll's ability to control the edge; by setting up a roll shifting device, the relative position of the working roll is changed to improve the working roll's ability to control the plate shape;

[0030] 2. This application can make one roll type adapt to the production of various specifications by bending the working roll and the support roll at the same time, which is convenient for roll grinding, reduces the number of roll changes, and improves the operating rate;

[0031] 3. By bending the support rolls, when this method is adopted, an additional bending force is applied to both ends of the working rolls and the support rolls, which can increase or decrease the deflection of the rolls during the rolling process, so that the actual deflection of the rolls is automatically or artificially maintained at the optimal value;

[0032] 4. By bending the support roll, the bending roll force adds additional load to the working roll bearing itself, which overcomes the problem of thinning of the strip edge caused by the working roll flattening the strip edge at the contact point between the strip and the working roll.

[0033] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the hot rolling mill of the present invention;

[0035] Figure 2 It is a transverse cross-sectional view of the roller shifting mechanism of the present invention;

[0036] Figure 3 This is a side view of the operation of the roller shifting mechanism of the present invention;

[0037] Figure 4 It is a transmission side view of the roller shifting mechanism of the present invention;

[0038] Figure 5 It is a schematic diagram of the support roller structure of the present invention.

[0039] 1. Working roll; 2. Support roll; 3. Frame; 4. Fixed block on operating side; 5. Fixed block on driving side; 6. Roller shifting cylinder; 7. Moving block on operating side; 8. Moving block on driving side; 9. External support; 10. Bending roll cylinder; 11. Locking pin; 12. Bearing seat locking device; 13. Balance block locking cylinder; 14. Hydraulic cylinder; 15. Bearing seat. DETAILED DESCRIPTION

[0040] refer to Figure 1-5 The present invention discloses a novel four-roll hot rolling mill roll bending device, comprising a working roll 1, a supporting roll 2, a frame 3, an operating side fixed block 4, a transmission side fixed block 5, a roll shifting cylinder 6, an operating side moving block 7 and a transmission side moving block 8.

[0041] The operating side fixed block 4 is located at the end of the working roller 1 on the operating side of the frame 3, and the transmission side fixed block 5 is located at the end of the working roller 1 on the transmission side of the frame 3. The operating side fixed block 4 and the transmission side fixed block 5 are both in a "T" shape. They are positioned on the frame 3 through the upper and lower and left and right stoppers set on the frame 3, and are bolted to the four inner surfaces of the operating side and the transmission side of the frame 3 respectively. During work, they mainly play the role of supporting the moving block and bearing the bending roll force.

[0042] A roll shifting cylinder 6 is installed on the operating side fixing block 4, and one end of the roll shifting cylinder 6 is connected to the operating side fixing block 4; the transmission side fixing block 5 extends toward the outside of the frame 3 to form an external support 9, which is used to fix the shaft clamping device of the roller side shaft head when changing rolls.

[0043] The operating side moving block 7 is slidably arranged on the operating side fixed block 4 , the transmission side moving block 8 is slidably arranged on the transmission side fixed block 5 , and self-lubricating slide plates are inlaid on the sliding surfaces of the operating side moving block 7 and the transmission side moving block 8 .

[0044] A roll bending cylinder 10 is provided inside the operating side moving block 7 and the transmission side moving block 8 . The roll bending cylinder 10 is pressed against the bearing seat 15 of the working roll 1 and is used to perform roll bending operation on the working roll 1 .

[0045] The operating side moving block 7 and the roller shifting cylinder 6 are connected together through a locking pin 11. The locking pin 11 connects the roller shifting cylinder 6 and the operating side moving block 7. The operating side moving block 7 is driven to move by the roller shifting cylinder 6. When roller shifting is not needed, the locking pin 11 is connected to the operating side fixed block 4 and the operating side moving block 7 to fix the two.

[0046] A bearing seat locking device 12 is provided inside the operating side moving block 7. The bearing seat locking device 12 is used to connect the operating side moving block 7 with the bearing seat 15 of the operating side working roll 1. The bearing seat locking device 12 is a locking cylinder.

[0047] A bearing seat locking device 12 is provided inside the transmission side moving block 8, and the bearing seat locking device 12 is used to connect the transmission side moving block 8 and the bearing seat 15 of the transmission side working roll 1 together, and then separate them when changing the rolls.

[0048] The transmission side moving block 8 is connected to the frame 3 through a balancing block locking cylinder 13, and the balancing block locking cylinder 13 is fixed on the frame 3. After the roller-shifting cylinder 6 pushes the transmission side moving block 8 to the corresponding position, the balancing block locking cylinder 13 fixes the transmission side moving block 8 to the frame 3, opens when the roller is shifting, and locks when the roller is not shifting.

[0049] In addition, the roll shifting cylinder 6 is connected to a hydraulic servo system and a displacement sensor. The hydraulic servo system controls the roll shifting distance of the roll shifting cylinder 6. The working process is as follows: controlled by the hydraulic servo system and the displacement sensor, the four roll shifting cylinders 6 drive the four moving blocks on the operating side, and then drive the working roll 1. The four moving blocks on the transmission side are driven by the working roll 1 to realize the roll shifting process of the working roll 1. When the working roll 1 shifts, the working roll 1 is required to rotate. The axial fixed cylinder is closed when the rolling mill is working and opened when the working roll 1 is changed.

[0050] The bearing seat 15 of the support roll 2 and the bearing seat 15 of the working roll 1 are in contact with each other through a backing plate, and a hydraulic cylinder 14 is embedded in the bearing seat 15 of the support roll 2. The hydraulic cylinder 14 is pressed against the backing plate to realize the roll bending control of the support roll 2. The thickness of the backing plate is adjusted according to the plate shape and plate crown that need to be improved.

[0051] When the plate shape and convexity need to be improved, the moving distance and the value of the bending roll force can be set according to the model. At the same time, the bending roll can achieve a constant stiffness of the roller system to achieve the purpose of controllable overall and edge thickness of the plate.

[0052] By setting a roll bending device for the support roll 2, a force opposite to that of the working roll 1 is applied to enhance the edge control capability of the working roll 1; by setting a roll shifting device, the relative position of the working roll 1 is changed to enhance the plate shape control capability of the working roll 1.

[0053] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A novel four-roll hot rolling mill roll bending device, comprising a working roll (1) and a support roll (2), characterized in that: The bearing seats of the working roll (1) and the supporting roll (2) are contact-connected via a pad, and a hydraulic cylinder (14) acts on the bearing seat (15) of the supporting roll (2), and the hydraulic cylinder (14) rests on the pad.

2. A novel four-roll hot rolling mill roll bending device according to claim 1, characterized in that: The hydraulic cylinder (14) is embedded in the bearing seat (15) of the supporting roller (2).

3. A novel four-roll hot rolling mill roll bending device according to claim 1, characterized in that: A roll bending cylinder (10) is provided at the end of the working roll (1) for performing a roll bending operation on the working roll (1).

4. A novel four-roller hot rolling mill roll bending device according to claim 3, characterized in that: It also comprises a frame (3), an operating side fixed block (4), a transmission side fixed block (5), a roller shifting cylinder (6), an operating side moving block (7) and a transmission side moving block (8), wherein the operating side fixed block (4) and the transmission side fixed block (5) are fixedly mounted on the frame (3), the roller shifting cylinder (6) is mounted on the operating side fixed block (4), and one end of the roller shifting cylinder (6) is connected to the operating side fixed block (4); The operating side moving block (7) is slidably arranged on the operating side fixed block (4) and is connected to the roller shifting cylinder (6) via a locking pin shaft (11); the transmission side moving block (8) is slidably arranged on the transmission side fixed block (5); The operating side moving block (7) and the transmission side moving block (8) are both connected to the bearing seat (15) of the working roll (1) via a bearing seat locking device (12).

5. A novel four-roll hot rolling mill roll bending device according to claim 4, characterized in that: Self-lubricating slide plates are inlaid on the sliding surfaces of the operating side moving block (7) and the transmission side moving block (8).

6. A novel four-roll hot rolling mill roll bending device according to claim 4, characterized in that: The roll bending cylinder (10) is arranged inside the operating side moving block (7) and the transmission side moving block (8), and the roll bending cylinder (10) is supported on the bearing seat (15) of the working roll (1).

7. A novel four-roller hot rolling mill roll bending device according to claim 4, characterized in that: The transmission side moving block (8) is connected to the frame (3) via a balancing block locking cylinder (13).

8. A novel four-roller hot rolling mill roll bending device according to claim 4, characterized in that: The roller shifting cylinder (6) is connected to a hydraulic servo system and a displacement sensor, and the extension and contraction amount of the roller shifting cylinder (6) is controlled by the hydraulic servo system and the displacement sensor.

9. A novel four-roll hot rolling mill roll bending device according to claim 1, characterized in that: The frame (3) is provided with stoppers for positioning the operating side fixing block (4) and the transmission side fixing block (8); the operating side fixing block (4) and the transmission side fixing block (8) are both fastened to the inner side surface of the frame (3) by bolts.

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