Three-roller rolling mill roll stand with roll balancing device and three-roller rolling mill

Abstract

The present invention provides a three-roll mill roll stand with a roll balancing device and a three-roll mill. The three-roll mill roll stand with the roll balancing device comprises an inner frame (1), the inner frame (1) comprises two side plates (8) spaced apart in front and back, three sets of roll units are arranged between the two side plates (8), the roll units comprise roll assemblies and roll balancing devices (4), when the roll assemblies are subjected to pressure directed in the direction of the rolling center line, the roll balancing devices (4) can provide the roll assemblies with a reaction force of the pressure. The three-roll mill roll stand avoids the problem that the centers of the three rolls of a lever-type roll stand cannot completely coincide with the center of the stand within the adjustment range, and solves the problem that the vertical press-down roll stand is not suitable for lateral roll changing and the roll changing operation is complicated. The three-roll mill roll stand has the characteristics of simple and reasonable structure, convenient operation and maintenance, low cost, safety and reliability, etc.

Description

Technical Field

[0001] The invention relates to the field of rolling equipment, in particular to a three-roller rolling mill roll frame with a roll balancing device, and also to a three-roller rolling mill. Background Art

[0002] Three-roll continuous rolling mills are divided into axial roll-changing and lateral roll-changing types based on the roll-changing method. The axial roll-changing type requires all roll stands to be pulled out from the external stand at the same time when changing rolls; while the lateral roll-changing type requires the roll stand to be pulled out from the side of the external stand when changing rolls. The lateral roll-changing type allows for the replacement of any one or more stands, making operation more flexible; while the axial roll-changing type requires all stands to be pulled out before one or more stands can be replaced, making operation less flexible. The core equipment of the three-roll continuous rolling mill is the three-roll roll stand, which can be divided into two types: lever swing press type and vertical press type, depending on the different motion trajectories of the rolls relative to the workpiece.

[0003] In the lever swing pressing type, since the three rollers are installed on the lever arm, the lever arm rotates around its own pivot, so that the center line of the roller hole profile always deviates from the roller pressing radius direction. Within the adjustment range, the three roller centers and the frame center cannot completely coincide, resulting in speed differences at the corresponding hole nodes on both sides of the roller center, affecting the rolling stability; assembly, maintenance and adjustment are difficult, and the accuracy deviation is large.

[0004] The vertical hold-down type avoids the drawbacks of the lever-swing type, but due to limited space and size, the rolls must be connected to the roll gap adjustment device (i.e., the hold-down cylinder) to achieve hold-down and roll balance. This requires a T-slot in the roll bearing connection block, a T-bar at the center of the hold-down cylinder, and alignment of the T-slot and the T-bar. A dedicated hydraulic cylinder at the end of the hold-down cylinder is required to lift the bar. This complex structure presents numerous points of failure and makes roll changing operations complex and cumbersome. The lateral roll-changing rig is even more complex. The T-bar must first be aligned, then lowered, inserted, rotated, and then lifted to position the roll against the hold-down cylinder. The hold-down cylinder is also complex, and the space at the end of the hold-down cylinder, where the displacement sensor should be located, is completely occupied by these complex mechanisms. This type of hold-down device is complex, costly, and difficult to operate and maintain. It has numerous potential points of failure, and if a failure occurs, it takes a long time to resolve, significantly disrupting normal production. Summary of the Invention

[0005] In order to improve the position accuracy of the rolling rolls, the present invention provides a three-roll mill roll stand and a three-roll mill with a roll balancing device. The three-roll mill roll stand with the roll balancing device avoids the problem that the centers of the three rolls and the center of the stand cannot be completely coincident within the adjustment range of the lever-type roll stand. On the other hand, it solves the problem that the vertical press-down roll stand is not suitable for lateral roll changing and the roll changing operation is complicated. The three-roll mill roll stand has the characteristics of simple and reasonable structure, convenient operation and maintenance, low cost, safety and reliability.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A three-roller rolling mill roll frame with a roll balancing device includes an inner frame, the inner frame has two side plates spaced apart in front and back, three sets of roll units are arranged between the two side plates, the roll units include a roll assembly and a roll balancing device, the roll assembly includes a roll assembly, a roll bearing seat and a shoulder beam connected in sequence, the roll assembly can move along the diameter direction of the inner frame, and when the roll assembly is subjected to pressure pointing in the direction of the rolling center line, the roll balancing device can provide the roll assembly with a reaction force to the pressure.

[0008] The roll balancing device comprises a roll supporting member and a reaction force providing mechanism. The roll supporting member is fixed relative to the side plate. The roll assembly is connected to the roll supporting member through the reaction force providing mechanism.

[0009] The roller support is a support block or a support pin, which is fixed to the inner surfaces of the two side plates. The roller assembly contains rollers, and along the axis direction of the rollers, the roller support is located outside the two roller bearing seats.

[0010] The reaction force providing mechanism includes a guide sleeve, a spring and a guide pin connected in sequence. A reaction force providing mechanism mounting hole is provided in the shoulder beam. One end of the guide sleeve abuts against the roller support. The guide sleeve can move along the diameter direction of the inner frame. The guide sleeve and the reaction force providing mechanism mounting hole are clearance-fitted or transition-fitted. The guide pin is fixed in the reaction force providing mechanism mounting hole. When the roller assembly is subjected to pressure pointing in the direction of the rolling center line, the spring can provide the roller assembly with a reaction force of the pressure.

[0011] The reaction force providing mechanism is a spring, an elastic colloid buffer, a hydraulic cylinder or an air cylinder, and two ends of the reaction force providing mechanism are respectively connected with the roller supporting member and the shoulder beam.

[0012] The roller unit also includes a slideway, which extends along the diameter direction of the inner frame and is fixed to the inner surfaces of the two side plates. The roller bearing seat is provided with a slide plate, which is matched and connected to the slideway.

[0013] Along the diameter direction of the inner frame, the roller assembly and the roller bearing seat are both located on the inner side of the shoulder pole beam, and a pressure block is provided on the outer side of the shoulder pole beam.

[0014] The roller unit further comprises a movement limiting mechanism, and along the diameter direction of the inner frame, the movement limiting mechanism can enable the roller assembly to move within a set range.

[0015] The movable limiting mechanism includes an inner limiting hole, an outer limiting hole and a limiting pin. The inner limiting hole is located on the shoulder pole beam, the outer limiting hole is located on the side plate, the limiting pin passes through the outer limiting hole, and one end of the limiting pin is located in the inner limiting hole. The inner limiting hole is long and strip-shaped, and the length direction of the inner limiting hole is the same as the diameter direction of the inner frame.

[0016] A three-roll rolling mill comprises the above-mentioned three-roll rolling mill roll frame with a roll balancing device, wherein the three-roll rolling mill roll frame with a roll balancing device is connected to a servo depression cylinder, which can move the roll assembly along the diameter direction of an inner frame, and the servo depression cylinder can also provide pressure to the roll assembly pointing in the direction of the rolling center line.

[0017] The beneficial effects of the present invention are:

[0018] 1. The balancing device is integrated into the roll stand, overcoming the influence of gravity on the roll position, making the position of the roll relative to the roll stand completely symmetrical and fixed, making the roll changing operation more convenient.

[0019] 2. The balancing device completely separates the roll balancing device from the roll pressing device, making them independent of each other, thus simplifying the structure of the roll adjustment device pressing cylinder and reducing the possibility of failure.

[0020] 3. The roll stand with balancing device enables both lateral and axial roll changing. This fully utilizes the technical advantages of the vertical reduction mill roll pass, achieving complete symmetry during the reduction process and improving the geometry, precision, and surface quality of the rolled product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 It is a front schematic diagram of the three-roll rolling mill described in the present invention.

[0023] Figure 2 Schematic diagram of a three-roller rolling mill roll stand with a roll balancing device according to the present invention.

[0024] Figure 3 is a schematic diagram of the side panel.

[0025] Figure 4 yes Figure 1 Schematic diagram of direction A.

[0026] Figure 5 yes Figure 4 An enlarged schematic diagram of the middle roll balancing device.

[0027] Figure 6 yes Figure 2 Schematic diagram of direction B.

[0028] 1. Inner frame; 2. Roller assembly; 3. Shoulder beam; 4. Roller balancing device; 5. Slide; 6. Roller support; 7. Limit pin; 8. Side plate; 9. Roller bearing seat; 10. Roller; 11. Reaction force providing mechanism mounting hole; 12. Pressure block; 13. Reaction force providing mechanism; 14. Slide plate; 15. Guide sleeve; 16. Spring; 17. Guide pin; 18. Inner limit hole; 19. Outer limit hole; 20. External frame; 21. Servo pressure cylinder; 22. Rolling hole; 23. Gasket. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] A three-roller rolling mill roll stand with a roll balancing device includes an inner frame 1, the inner frame 1 includes two side plates 8 spaced apart in front and back, three sets of roll units are arranged between the two side plates 8, the roll units include a roll assembly and a roll balancing device 4, the roll assembly includes a roll assembly 2, a roll bearing seat 9 and a shoulder beam 3 connected in sequence, the roll assembly can move along the diameter direction of the inner frame 1, when the roll assembly is subjected to pressure pointing in the direction of the rolling center line L1, the roll balancing device 4 can provide the roll assembly with a reaction force of the pressure, that is, the roll balancing device 4 can provide the roll assembly with a force that is the same as the pressure in magnitude but opposite in direction, such as Figure 1 and Figure 2 shown.

[0031] Both side plates 8 are provided with a rolling hole 22. The axes of the rolling holes 22 on the two side plates 8 coincide with the rolling centerline L1. The three sets of rolling roller units are evenly spaced along the circumference of the rolling hole 22, and each set of rolling roller units is identical. The rolling roller assembly is movable along the diameter of the rolling hole 22 and away from the axis of the rolling hole 22, thereby allowing the rolling roller assembly to be detached from the two side plates 8.

[0032] In this embodiment, when adjusting the roll assembly, the servo pressing cylinder 21 provides pressure to the roll assembly in the direction of the rolling center line L1, and the roll assembly can move along the diameter direction of the inner frame 1. The roll balancing device 4 can provide the roll assembly with a reaction force to the pressure. Since the action force (i.e., the pressure) and the reaction force are of the same magnitude but opposite direction, the roll assembly is in a force balance state, and is therefore called a roll balancing device 4.

[0033] In this embodiment, the roll balancing device 4 includes a roll support 6 and a reaction force providing mechanism 13. The roll support 6 is fixed relative to the side plate 8 and is fixedly connected to the side plate 8. The roll support 6 cannot move or rotate relative to the side plate 8. The roll assembly and the roll support 6 are connected via the reaction force providing mechanism 13. The roll support 6 supports the reaction force providing mechanism 13, and the reaction force providing mechanism 13 provides the reaction force to the roll assembly.

[0034] In this embodiment, the roller support member 6 is a support block or a support pin, that is, the roller support member 6 is a block structure or a columnar structure. Preferably, the roller support member 6 is a support block, such as Figures 3 to 5 As shown, the roll support 6 is fixed to the inner surfaces of the two side plates 8. The roll assembly 2 includes a roll 10. Along the axis of the roll 10, the roll support 6 is located outside the two roll bearing seats 9. The reaction force providing mechanism 13 is connected to the roll support 6 and the shoulder beam 3 respectively.

[0035] In this embodiment, the reaction force providing mechanism 13 includes a guide sleeve 15, a spring 16 and a guide pin 17 connected in sequence. A reaction force providing mechanism mounting hole 11 is provided in the shoulder beam 3. One end of the guide sleeve 15 abuts against the roller support 6. A gasket 23 is provided between the guide sleeve 15 and the roller support 6. The guide sleeve 15 and the reaction force providing mechanism mounting hole 11 are clearance-fitted or transition-fitted. The guide pin 17 is fixed in the reaction force providing mechanism mounting hole 11. The two ends of the spring 16 abut against the guide sleeve 15 and the guide pin 17 respectively. The guide sleeve 15 can move along the diameter direction of the rolling hole 22. When the roller assembly is subjected to pressure pointing in the direction of the rolling center line, the spring 16 can provide the roller assembly with a reaction force of the pressure.

[0036] In this embodiment, the roller supports 6 and the reaction force providing mechanisms 13 are connected one-to-one. Each of the roller units contains four roller balancing devices 4, that is, each of the roller units contains four roller supports 6 and four reaction force providing mechanisms 13. Two of the four roller supports 6 are located on the inner surface of one side plate 8, and the other two of the four roller supports 6 are located on the inner surface of another side plate 8. Figures 3 to 6The shoulder pole beam 3 is a rectangular plate structure, and the four corners of the shoulder pole beam 3 are provided with protrusions, and each of the protrusions is provided with a reaction force providing mechanism mounting hole 11.

[0037] In addition, the reaction force providing mechanism 13 can be implemented in various ways. The reaction force providing mechanism 13 can also be simply a spring 16, or an existing elastic colloid buffer, a hydraulic cylinder, or a pneumatic cylinder. The two ends of the reaction force providing mechanism 13 are respectively connected to the roller support 6 and the shoulder beam 3. The shoulder beam 3 may or may not be provided with a reaction force providing mechanism mounting hole 11.

[0038] In this embodiment, the rolling unit further includes a slideway 5, preferably two slideways 5. The two slideways 5 extend along the diameter of the inner frame 1 (i.e., the diameter of the rolling hole 22). The slideways 5 are fixed to the inner surfaces of the two side plates 8. Along the circumference of the rolling hole 22, two roll support members 6 are located outside the two slideways 5 on either side. A shoulder beam 3 is connected to two roll bearing blocks 9, each of which is equipped with a slide plate 14 that mates with the slideway 5.

[0039] In this embodiment, the roll assembly 2 and roll chock 9 are both located inside the shoulder-pole beam 3 along the diameter of the inner frame 1. A pressure block 12 is provided outside the shoulder-pole beam 3. That is, the pressure block 12, shoulder-pole beam 3, and roll chock 9 are arranged in this order along the diameter of the inner frame 1. The function of the pressure block 12 is to contact the pressure block 12 when the servo screw-down cylinder 21 applies pressure to the roll assembly in the direction of the rolling centerline L1.

[0040] In this embodiment, the roller unit also includes a movement limiting mechanism that enables the roller assembly to move within a set range along the diameter of the inner frame 1. The movement limiting mechanism includes an inner limiting hole 18, an outer limiting hole 19, and a limiting pin 7. The limiting pin 7 is removable, that is, it can be separated from the shoulder beam 3 and the side plate 8. The inner limiting hole 18 is located on the shoulder beam 3, and the outer limiting hole 19 is located on the side plate 8. The limiting pin 7 passes through the outer limiting hole 19, and one end of the limiting pin 7 is plugged into the inner limiting hole 18. The inner limiting hole 18 is elongated, and the length direction of the inner limiting hole 18 is the same as the diameter direction of the inner frame 1.

[0041] Since the limit pin 7 can only move within the length of the inner limit hole 18, the roller assembly can also only move within the length of the inner limit hole 18. Preferably, the range of movement of the roller assembly is 1mm-100mm. In addition, the limit pin 7 can also be a limit block, and the outer limit hole 19 can also be an elongated strip. One end of the limit pin 7 is matingly inserted into the inner limit hole 18, and the limit pin 7 passes through the outer limit hole 19.

[0042] The following introduces a three-roll rolling mill, which includes the above-mentioned three-roll rolling mill roll frame with a roll balancing device. The three-roll rolling mill roll frame with a roll balancing device is connected to a servo depression cylinder 21. The servo depression cylinder 21 can move the roll assembly along the diameter direction of the inner frame 1. The servo depression cylinder 21 can also provide pressure to the roll assembly in the direction of the rolling center line.

[0043] The three-roll rolling mill also includes an external frame 20, and the three-roll rolling mill roll frame with a roll balancing device is installed in the external frame 20. The three-roll rolling mill includes three servo pressing cylinders 21, and the three servo pressing cylinders 21 are evenly spaced along the circumference of the rolling hole 22. The three servo pressing cylinders 21 are connected to the roll assemblies of the three sets of roll units in a one-to-one correspondence, and the three servo pressing cylinders 21 are all fixed on the external frame 20.

[0044] The working process of the three-roller rolling mill roll stand and the three-roller rolling mill with a roll balancing device is introduced below.

[0045] During the roll assembly installation process, the roll assembly 2 is first pushed along the slideway 5 into the inner frame 1. One end of the four reaction force providing mechanisms 13 mounted on the shoulder beam 3 contacts the roll support 6 on the side plate 8. As the pushing force increases, the springs 16 in the reaction force providing mechanisms 13 are compressed, generating a balancing reaction force. When the inner limit holes 18 on the shoulder beam 3 align with the outer limit holes on the side plate 8, the limit pins 7 are inserted. The external thrust is then gradually removed, and the shoulder beam 3, under the action of the balancing force, moves the roll assembly 2 away from the rolling centerline. Eventually, the inner end of the inner limit hole 18 on the shoulder beam 3 abuts the limit pins 7. With the combined action of three sets (12 in total) of balancing devices 4 and three sets (3 in total) of limit pins 7, the three roll assemblies 2 are positioned in the ideal pre-operating position within the roll stand's inner frame 1. This position is most conducive to stand replacement operations in the rolling mill.

[0046] After the assembled three-high mill roll frame, including the roll balancing device, is installed into the mill's external frame 20, the frame is effectively locked and the connecting shaft is connected. The piston rod of the servo hold-down cylinder 21 extends, contacts the pressure block 12 on the shoulder beam 3, and then continues to press downward. The piston rod of the servo hold-down cylinder 21 extends and retracts in the direction of the diameter of the rolling hole 22, and the inner arc of the inner limit hole 18 on the shoulder beam 3 disengages from the limit pin 7. The servo hold-down cylinder 21 continues to press downward until it reaches the preset rolling position of the roll 10. After the displacement sensor on the servo hold-down cylinder 21 detects the position signal, the servo hold-down cylinder 21 stops at the preset position. The servo hold-down cylinder 21 and the roll balancing device 4 work together to maintain the roll assembly 2 in the preset rolling working position.

[0047] When the rolling process is completed and the roll stand needs to be replaced, the piston rod of the servo down-acting cylinder 21 retracts. Under the action of the roll balancing device 4, the roll assembly 2 moves along the slideway 5 in the direction away from the rolling center line. Finally, the inner end arc of the inner limit hole 18 on the balance beam 3 abuts against the limit pin 7. Subsequently, the piston rod of the servo down-acting cylinder 21 disengages from the pressing block 12 on the balance beam 3, and the piston rod of the servo down-acting cylinder 21 continues to retract to the initial state. After disconnecting the coupling shaft and releasing the lock, the roll stand can be removed.

[0048] The roll stand and the three-roll rolling mill with the roll balancing device of the present invention not only meet the requirements of vertical roll adjustment but also satisfy the requirements of roll weight balance. Moreover, the position of the roll in the stand is stable and accurate; the structure of the force down-acting adjustment mechanism and the hydraulic system are simplified, reducing the investment cost of hydraulic equipment and the operation and maintenance work; the operation of replacing the stand becomes extremely simple and fast; it can be applied to both the side roll-changing type three-roll pipe mill and the axial roll-changing type three-roll pipe mill as well as the bar three-roll rolling mill. The roll stand of the three-roll rolling mill with the roll balancing device of the present invention has the advantages of simple and reasonable structure, low cost, convenient operation and maintenance, safety and reliability, and wide application range.

[0049] For the convenience of understanding and description, an absolute positional relationship is adopted in the present invention. Without special instructions, the orientation word "front" means the direction perpendicular to Figure 1 the paper surface and pointing to the inner side of the paper surface, and the orientation word "rear" means the direction perpendicular to Figure 1 the paper surface and pointing to the outer side of the paper surface. The present invention is described from the observation perspective of the reader or user, but the above orientation words should not be understood or interpreted as limiting the protection scope of the present invention.

[0050] As described above, only the specific embodiments of the present invention are provided, and the scope of the invention implementation cannot be limited by them. Therefore, the replacement of equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention patent should still fall within the scope covered by this patent. In addition, the technical features in the present invention can be freely combined with each other between technical features, between technical features and technical solutions, and between technical solutions.

Claims

1. A three-roll mill, characterized in that: The three-roll mill includes a three-roll mill roll stand with a roll balancing device; The three-roller rolling mill roll frame with a roll balancing device includes an inner frame (1), the inner frame (1) includes two side plates (8) spaced apart from each other, the two side plates (8) are each provided with a rolling hole (22), three sets of roll units are provided between the two side plates (8), the roll unit includes a roll assembly and a roll balancing device (4), the roll assembly includes a roll assembly (2), a roll bearing seat (9) and a shoulder beam (3) connected in sequence, the roll assembly can move along the diameter direction of the rolling hole (22) of the inner frame (1) and separate from the two side plates (8), and when the roll assembly is subjected to pressure directed in the direction of the rolling center line, the roll balancing device (4) can provide a reaction force to the pressure to the roll assembly; The three-roller rolling mill roll frame with a roll balancing device is connected to a servo pressing cylinder (21), which can move the roll assembly along the diameter direction of the rolling hole (22) of the inner frame (1), and the servo pressing cylinder (21) can also provide pressure to the roll assembly in the direction of the rolling center line; The roller balancing device (4) includes a roller support member (6) and a reaction force providing mechanism (13), wherein the roller support member (6) is fixed to the inner surfaces of the two side plates (8), and the two ends of the reaction force providing mechanism (13) are respectively connected to the roller support member (6) and the shoulder beam (3); Along the diameter direction of the rolling hole (22) of the inner frame (1), the roller assembly (2) and the roller bearing seat (9) are both located on the inner side of the shoulder beam (3), and a pressure block (12) is provided on the outer side of the shoulder beam (3); The piston rod of the servo pressing cylinder (21) is in contact with the pressing block (12), or the piston rod of the servo pressing cylinder (21) is separated from the pressing block (12) on the shoulder beam (3); The roller unit further comprises a movement limiting mechanism, which enables the roller assembly to move within a set range along the diameter direction of the rolling hole (22) of the inner frame (1); The movable limiting mechanism comprises an inner limiting hole (18), an outer limiting hole (19) and a limiting pin (7), wherein the inner limiting hole (18) is located on the shoulder pole beam (3), the outer limiting hole (19) is located on the side plate (8), the limiting pin (7) passes through the outer limiting hole (19), one end of the limiting pin (7) is located in the inner limiting hole (18), and the limiting pin (7) can be separated from the shoulder pole beam (3) and the side plate (8), and the inner limiting hole (18) is in the shape of an elongated strip, and the length direction of the inner limiting hole (18) is the same as the diameter direction of the rolled hole (22) of the inner frame (1).

2. The three-roll mill according to claim 1, characterized in that The roller support member (6) is a support block or a support pin. The roller assembly (2) contains a roller (10). Along the axis direction of the roller (10), the roller support member (6) is located outside the two roller bearing seats (9).

3. The three-roll mill according to claim 1, characterized in that The reaction force providing mechanism (13) comprises a guide sleeve (15), a spring (16) and a guide pin (17) connected in sequence. A reaction force providing mechanism mounting hole (11) is provided in the shoulder beam (3). One end of the guide sleeve (15) abuts against the roller support (6). The guide sleeve (15) can move along the diameter direction of the rolling hole (22) of the inner frame (1). The guide sleeve (15) and the reaction force providing mechanism mounting hole (11) are clearance-fitted or transition-fitted. The guide pin (17) is fixed in the reaction force providing mechanism mounting hole (11). When the roller assembly is subjected to pressure directed in the direction of the rolling center line, the spring (16) can provide the roller assembly with a reaction force of the pressure.

4. The three-roll mill according to claim 1, characterized in that The reaction force providing mechanism (13) is a spring (16), an elastic colloid buffer, a hydraulic cylinder or a pneumatic cylinder.

5. The three-roll mill according to claim 1, characterized in that The rolling unit further comprises a slideway (5), which extends along the diameter direction of the rolling hole (22) of the inner frame (1). The slideway (5) is fixed to the inner surfaces of the two side plates (8). A slide plate (14) is provided on the rolling bearing seat (9), and the slide plate (14) is matched and connected to the slideway (5).

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