Medium and heavy plate rolling mill work roll positive bending roll device

Abstract

This utility model relates to a bending roll device for work rolls in medium and heavy plate rolling mills, belonging to the field of rolling mill equipment in the metallurgical industry. Its purpose is to extend the service life of the bending roll cylinder. The upper cylinder piston rod of the upper bending roll cylinder is connected to an upper guide plate. The top plate, outer guide plate, and inner guide plate of the upper guide plate form a downward-facing groove that engages with the top of the bending roll cylinder block. The upper cylinder piston rod is connected to the top plate and pushes the upper roll bearing seat via the upper guide plate. The lower cylinder piston rod is connected to a lower guide plate and pushes the lower roll bearing seat via the lower guide plate. The upper guide plate transmits the frictional force of the bearing seat moving axially along the work roll when the work roll shifts to the bending roll cylinder block, preventing the upper cylinder piston rod of the upper bending roll cylinder from being subjected to radial force. It has a good guiding effect and alleviates problems such as sealing oil leakage, rapid guide wear, and even piston rod deformation caused by long-term radial force during roll shifting. This helps extend the service life of the upper bending roll cylinder and is suitable for rolling mills with large openings. The bending roll cylinder is easy to install and disassemble, and convenient to maintain.

Description

Technical Field

[0001] This utility model belongs to the field of rolling mill equipment in the metallurgical industry, specifically a positive bending roll device for work rolls of medium and heavy plate rolling mills. Background Technology

[0002] Four-high rolling mills typically require work roll bending devices for plate shape control, and these devices vary depending on the type of mill. Currently, the 4×4 bending cylinder type is commonly used in medium and heavy plate rolling mills. This involves four bending cylinder blocks: the operating side inlet, the operating side outlet, the drive side inlet, and the drive side outlet. Each bending cylinder block contains four hydraulic cylinders. The piston rods of two hydraulic cylinders push against the bearing seats of the work rolls, while the piston rods of the other two hydraulic cylinders push against the bearing seats of the work rolls. This structure is perfectly suitable for situations where the work rolls do not shift. However, for mills with work roll shifting (the upper and lower work rolls move along the axis), the bending cylinder piston rods are subjected to significant radial forces during work roll shifting. Medium and heavy plate rolling mills generally have a long stroke for the upper bending cylinder due to the large mill opening, leading to issues such as oil leakage in the seals, rapid wear of the guides, and even piston rod deformation under the long-term radial forces of the shifting rolls. Utility Model Content

[0003] The purpose of this invention is to provide a positive bending roll device for work rolls in medium and heavy plate rolling mills, thereby extending the service life of the bending roll cylinder.

[0004] The technical solution adopted in this utility model is as follows: a positive bending roll device for a medium-thick plate rolling mill, comprising four bending roll cylinder blocks installed inside the mill stand, each bending roll cylinder block having two upper bending roll cylinders for lifting the upper roll bearing seat and two lower bending roll cylinders for lifting the lower roll bearing seat; the upper bending roll cylinders are installed in the upper cavity of the bending roll cylinder block, and the lower bending roll cylinders are installed in the lower cavity of the bending roll cylinder block; the upper bending roll cylinders and their corresponding lower bending roll cylinders are located on the same vertical line; the piston rod end of the upper cylinder of the upper bending roll cylinder is connected to an upper guide plate, the upper guide plate including a top plate part, an outer guide part located outside the top plate part, and an inner guide part located inside the top plate part, the top plate part, the outer guide part, and the inner guide part surrounding to form a downward-facing groove that fastens to the top of the bending roll cylinder block; the piston rod of the upper cylinder is connected to the top plate part and lifts the upper roll bearing seat via the upper guide plate; the piston rod end of the lower cylinder of the lower bending roll cylinder is connected to a lower guide plate, and the piston rod of the lower cylinder lifts the lower roll bearing seat via the lower guide plate.

[0005] Furthermore, both the upper bending roller cylinder and the lower bending roller cylinder utilize the bending roller cylinder block as their cylinder body.

[0006] Furthermore, the lower guide plate is movably inserted into the lower cavity of the bending roller cylinder block.

[0007] Furthermore, an outer guide slide plate is provided between the outer guide portion and the outer side wall of the bending roller cylinder block, and the outer guide slide plate is connected to the outer guide portion; an inner guide slide plate is provided between the inner guide portion and the inner side wall of the bending roller cylinder block, and the inner guide slide plate is connected to the inner guide portion.

[0008] Furthermore, the outer guide plate and the outer guide part are connected by a bolt assembly. The connecting bolt in the bolt assembly passes through the countersunk hole on the outer guide plate and the bolt hole on the outer guide part in sequence, and is then tightened with the connecting nut. The inner guide plate and the inner guide part are connected by a bolt assembly. The connecting bolt in the bolt assembly passes through the countersunk hole on the inner guide plate and the bolt hole on the inner guide part in sequence, and is then tightened with the connecting nut. An adjusting stud is provided between the outer guide plate and the outer guide part. The adjusting stud is threaded to the outer guide part, and its end rests against the outer guide plate.

[0009] Furthermore, the upper guide plate also includes an end guide portion, which forms a turning L-shape with the top plate portion. The end guide portion is located between the side wall of the bending roller cylinder block and the upper roller bearing seat. The bending roller cylinder block has a notch on the side facing the upper roller bearing seat, and the end guide portion is located in the notch.

[0010] Furthermore, a countersunk through hole is provided at the top plate of the upper guide plate corresponding to the piston rod of the upper cylinder. A spacer ring and a pressure plate are provided in the countersunk through hole. The connecting screw passes through the pressure plate and the spacer ring in sequence and is screwed into the piston rod of the upper cylinder. The top of the spacer ring protrudes from the stepped plane of the countersunk through hole.

[0011] A countersunk through hole is provided at the corresponding position of the lower guide plate and the upper cylinder piston rod. A spacer ring and a pressure plate are provided in the countersunk through hole. The connecting screw passes through the pressure plate and the spacer ring in sequence and is screwed into the lower cylinder piston rod. The top of the spacer ring protrudes from the stepped plane of the countersunk through hole.

[0012] The beneficial effects of this utility model are as follows: The positive bending roll device for medium and heavy plate rolling mills disclosed in this utility model uses an upper guide plate to support the work roll bearing seat of the large-stroke upper bending roll cylinder. The grooved upper guide plate transmits the frictional force of the bearing seat moving axially along the work roll during roll shifting to the bending roll cylinder block, preventing the upper cylinder piston rod from being subjected to radial force. This provides a better guiding effect and alleviates the problems of sealing oil leakage, rapid guide wear, and even piston rod deformation that occur under long-term radial force during roll shifting. This helps extend the service life of the upper bending roll cylinder and is suitable for large-aperture rolling mills. The bending roll cylinder is easy to install and disassemble, and maintenance is convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one embodiment of the present utility model.

[0014] Figure 2This is a schematic diagram of Embodiment 2 of the present utility model;

[0015] Figure 3 for Figure 1 AA section view;

[0016] Figure 4 for Figure 3 BB cross-sectional view;

[0017] Figure 5 for Figure 1 A magnified view of part A;

[0018] Figure 6 for Figure 5 A magnified view of section B.

[0019] In the diagram, the following components are listed: bending roller block 1, bending roller block 1A, bending roller block 2B, bending roller block 3C, bending roller block 4D, upper work roller 2, upper roller bearing seat 3, upper cylinder piston rod 4, upper bending roller cylinder 1 41, upper bending roller cylinder 2 42, upper bending roller cylinder 3 43, upper bending roller cylinder 44, upper bending roller cylinder 5 45, upper bending roller cylinder 6 46, upper bending roller cylinder 7 47, upper bending roller cylinder 8 48, lower work roller 5, lower roller bearing seat 6, lower cylinder piston rod 7, lower bending roller cylinder 1 71, lower bending roller cylinder 2 72, lower bending roller cylinder 3 73, and lower bending roller cylinder 44. 74. Roller cylinder four, 75. Lower bending roller cylinder five, 76. Lower bending roller cylinder six, 77. Lower bending roller cylinder seven, 78. Lower bending roller cylinder eight, 8. Guide sleeve, 9. Mill archway, 10. Mill center line, 11. Rolling center line, 12. Upper guide plate, 121. Top plate, 122. Outer guide, 123. Inner guide, 124. End guide, 125. Outer guide slide plate, 126. Inner guide slide plate, 127. Bolt assembly, 128. Adjusting stud, 13. Lower guide plate, 14. Connecting screw, 15. Spacer ring, 16. Pressure plate, 17. Step plane. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] In this specification, the terms "vertical," "horizontal," "top," "bottom," "left," and "right," etc., indicate orientations or positional relationships based on the appendix. Figure 1 The orientation or positional relationship shown is for the purpose of describing the present invention only, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] The positive bending roll device of the work roll of a medium and heavy plate rolling mill, such as Figure 1 , Figure 2 and Figure 3As shown, the mill includes four bending roll cylinder blocks 1 installed inside the mill stand 9. Each bending roll cylinder block 1 has two upper bending roll cylinders for the upper roll bearing seat 3 and two lower bending roll cylinders for the lower roll bearing seat 6. The upper bending roll cylinders are installed in the upper cavity of the bending roll cylinder block 1, and the lower bending roll cylinders are installed in the lower cavity of the bending roll cylinder block 1. The upper bending roll cylinders and the corresponding lower bending roll cylinders are located on the same vertical line, and the center line between the two upper bending roll cylinders or the lower bending roll cylinders coincides with the bearing center line of the work roll when the work roll is not shifted.

[0023] The rolling mill work rolls include an upper work roll 2 and a lower work roll 5. Four bending roll blocks 1 are designated as bending roll block 1A, bending roll block 1B, bending roll block 1C, and bending roll block 1D. Bending roll block 1A and bending roll block 1B are located on the operating side of the rolling mill, while bending roll block 3C and bending roll block 4D are located on the drive side of the rolling mill. The operating side and drive side are situated on opposite sides of the rolling centerline 11. The rolling mill centerline 10 extends axially along the work rolls. Bending roll block 1A and bending roll block 3C are located to the left of the rolling mill centerline 10, while bending roll block 2B and bending roll block 4D are located to the right of the rolling mill centerline 10. (The left and right sides are attached...) Figure 3 As the standard.

[0024] The four bending roller cylinders in the bending roller cylinder block 1A are upper bending roller cylinder 41, lower bending roller cylinder 71, upper bending roller cylinder 42, and lower bending roller cylinder 72, with upper bending roller cylinder 42 and lower bending roller cylinder 72 located on the inner side, and upper bending roller cylinder 41 and lower bending roller cylinder 71 located on the outer side.

[0025] The four bending roller cylinders in the bending roller cylinder block 21B are the upper bending roller cylinder 3 43, the lower bending roller cylinder 3 73, the upper bending roller cylinder 44, and the lower bending roller cylinder 4 74; and the upper bending roller cylinder 44 and the lower bending roller cylinder 4 74 are located on the inner side, while the upper bending roller cylinder 3 43 and the lower bending roller cylinder 3 73 are located on the outer side.

[0026] The four bending roller cylinders in the bending roller cylinder block 31C are the upper bending roller cylinder 5 45, the lower bending roller cylinder 5 75, the upper bending roller cylinder 6 46, and the lower bending roller cylinder 6 76; and the upper bending roller cylinder 5 45 and the lower bending roller cylinder 5 75 are located on the inner side, while the upper bending roller cylinder 6 46 and the lower bending roller cylinder 6 76 are located on the outer side.

[0027] The four bending roller cylinders in the bending roller cylinder block 41D are the upper bending roller cylinder 747, the lower bending roller cylinder 77, the upper bending roller cylinder 848, and the lower bending roller cylinder 878; and the upper bending roller cylinder 747 and the lower bending roller cylinder 777 are located on the inner side, while the upper bending roller cylinder 848 and the lower bending roller cylinder 878 are located on the outer side.

[0028] The inner side refers to the side that is relatively closer to the rolling center line 11, and the outer side refers to the side that is relatively farther away from the rolling center line 11.

[0029] The upper cylinder piston rod 4 of the upper bending roller cylinder is connected to an upper guide plate 12 at one end. Figure 1 and Figure 4 As shown, the upper guide plate 12 includes a top plate portion 121, an outer guide portion 122 located outside the top plate portion 121, and an inner guide portion 123 located inside the top plate portion 121. The top plate portion 121, the outer guide portion 122, and the inner guide portion 123 surround and form a downward-facing groove that is fastened to the top of the bending roller cylinder block 1. The upper cylinder piston rod 4 is connected to the top plate portion 121 and pushes the upper roller bearing seat 3 through the upper guide plate 12. This upper bending roller cylinder, through the grooved upper guide plate 12, transmits the frictional force of the bearing seat moving axially along the working roller when the working roller shifts to the bending roller cylinder block 1, preventing the upper cylinder piston rod 4 from being subjected to radial force, alleviating the problems of sealing oil leakage, rapid guide wear, and even piston rod deformation of the upper cylinder piston rod 4 under long-term radial force of the roller shift, and helping to extend the service life of the upper bending roller cylinder.

[0030] When the rollers shift, the upper guide plate 12 and the bending roller block 1 are in direct contact, resulting in high friction and wear of the bending roller block 1, which affects its service life. To overcome this problem, in this embodiment, an outer guide slide plate 125 is provided between the outer guide portion 122 and the outer sidewall of the bending roller block 1, and the outer guide slide plate 125 is connected to the outer guide portion 122; an inner guide slide plate 126 is provided between the inner guide portion 123 and the inner sidewall of the bending roller block 1, and the inner guide slide plate 126 is connected to the inner guide portion 123. The outer guide slide plate 125 and the inner guide slide plate 126 are made of a softer material than the bending roller block 1, such as copper alloy, which can prevent the bending roller block 1 from wearing out quickly and extend its service life.

[0031] When the outer guide slide plate 125 or the inner guide slide plate 126 wears down, the gap between the slide plate and the bending roller block 1 increases. When the working roller moves too far, the upper guide plate 12 moves too far inward and outward, which will cause the upper guide plate 12 to transmit the friction between the upper roller bearing seat 3 and the upper guide plate 12 to the upper cylinder piston rod 4. To overcome this problem, in this embodiment, the outer guide slide plate 125 and the outer guide portion 122 are connected by a bolt assembly 127. The connecting bolt in the bolt assembly 127 passes through the countersunk hole on the outer guide slide plate 125 and the bolt hole on the outer guide portion 122 in sequence, and is then tightened with a connecting nut. The inner guide slide plate 126 and the inner guide portion 123 are connected by a bolt assembly 127. The connecting bolt in the bolt assembly 127 passes through the countersunk hole on the inner guide slide plate 126 and the bolt hole on the inner guide portion 123 in sequence, and is then tightened with a connecting nut. An adjusting stud 128 is provided between the outer guide slide plate 125 and the outer guide portion 122. The adjusting stud 128 is threaded onto the outer guide portion 122, and its end rests against the outer guide slide plate 125. With this configuration, by loosening the bolt assembly 127 of the outer guide slide plate 125 and turning the adjusting stud 128, the gap between the slide plate and the bending roller block 1 can be adjusted.

[0032] To further prevent radial force from being applied to the upper cylinder piston rod 4, preferably, as follows: Figure 5 and Figure 6 As shown, a countersunk through hole is provided at the top plate 121 of the upper guide plate 12 corresponding to the upper cylinder piston rod 4. The countersunk through hole is a two-section stepped hole composed of a large hole section and a small hole section, forming a stepped plane 17 between the large hole section and the small hole section. A spacer ring 15 and a pressure plate 16 are provided in the countersunk through hole. The connecting screw 14 passes through the pressure plate 16 and the spacer ring 15 in sequence and is screwed into the upper cylinder piston rod 4. The top of the spacer ring 15 protrudes from the stepped plane 17 of the countersunk through hole, and the height of the protruding part is K. The value of K can be set as needed, generally K≤5mm. Thus, when the connecting screw 14 is tightened, there is a gap K between the pressure plate 16 and the stepped plane 17. Since the spacer ring 15 is provided between the upper guide plate 12 and the upper cylinder piston rod 4, the force transmitted from the upper guide plate 12 to the upper cylinder piston rod 4 can be avoided.

[0033] Similarly, the lower guide plate 13 and the lower cylinder piston rod 7 can be connected in the same way as the upper guide plate 12 and the upper cylinder piston rod 4. That is, countersunk through holes are opened at the corresponding positions of the lower guide plate 13 and the lower cylinder piston rod 7. A spacer ring 15 and a pressure plate 16 are provided in the countersunk through holes. The connecting screw 14 passes through the pressure plate 16 and the spacer ring 15 in sequence and is screwed into the lower cylinder piston rod 7. The top of the spacer ring 15 protrudes from the stepped plane 17 of the countersunk through hole.

[0034] The upper guide plate 12 can be an inverted U-shaped groove structure formed by the top plate portion 121, the outer guide portion 122, and the inner guide portion 123. Of course, other structures can also be used, such as: Figure 2 and Figure 4 As shown, the upper guide plate 12 also includes an end guide portion 124. The end guide portion 124, the top plate portion 121, the outer guide portion 122, and the inner guide portion 123 form a semi-enclosed structure with four sides. The end guide portion 124 is located between the side wall of the bending roller block 1 and the upper roller bearing seat 3. In this way, the upper guide plate 12 surrounds the bending roller block 1, resulting in better guiding performance. A sliding plate can be provided between the end guide portion 124 and the bending roller block 1. Since the end guide portion 124 is less affected by the slippage of the roller than the outer guide portion 122 and the inner guide portion 123, a sliding plate may not be required between the end guide portion 124 and the bending roller block 1.

[0035] The lower cylinder piston rod 7 of the lower bending roll cylinder is connected to a lower guide plate 13 at its end. The lower cylinder piston rod 7 pushes against the lower roll bearing seat 6 via the lower guide plate 13. Since the upper bending roll cylinder is usually longer and the lower bending roll cylinder has a shorter stroke in the rolling mill, the lower bending roll cylinder is less affected by the roll shifting than the upper bending roll cylinder. In order to meet the radial force requirements of the lower bending roll cylinder while simplifying the structure, the lower guide plate 13 adopts a different structural form than the upper guide plate 12. The lower guide plate 13 is movably inserted into the lower cavity of the bending roll cylinder block 1, that is, the lower guide plate 13 adopts the form of a slider, partially protruding from the lower cavity of the bending roll cylinder block 1, pressing against the lower roll bearing seat 6, and the part is in movable cooperation with the lower cavity of the bending roll cylinder block 1.

[0036] It should be noted that when the lower guide plate 13 is in the form of a slider and the upper guide plate 12 is provided with an end guide portion 124, the bending roller block 1 has a notch on the side facing the upper roller bearing seat 3, and the end guide portion 124 is located in the notch. If the upper guide plate 12 is not provided with an end guide portion 124, the bending roller block 1 is a regular square shape.

[0037] The cylinder bodies of the upper and lower bending roller cylinders can be independent of the bending roller cylinder block 1, that is, their independent cylinder bodies are installed on the bending roller cylinder block 1. Preferably, both the upper and lower bending roller cylinders utilize the bending roller cylinder block 1 as their cylinder bodies.

[0038] The pressure of each bending roll cylinder disclosed in this utility model can be controlled according to the requirements of the steel plate rolling process. The control scheme is divided into two cases: the rolling mill without the work roll shifting function and the rolling mill with the work roll shifting function. The specific control method of the positive bending roll device of the work roll of the medium and heavy plate rolling mill is as follows:

[0039] When the mill is in a state where there are no work rolls, the rodless chamber pressures of the four upper bending roll cylinders (upper bending roll cylinder 1, 41; upper bending roll cylinder 2, 42; upper bending roll cylinder 3, 43; and upper bending roll cylinder 44) on the operating side of the mill are the same and jointly controlled. Similarly, the rodless chamber pressures of the four lower bending roll cylinders (lower bending roll cylinder 1, 71; lower bending roll cylinder 2, 72; lower bending roll cylinder 3, 73; and lower bending roll cylinder 44) are the same and jointly controlled. On the transmission side of the mill, the rodless chamber pressures of the four upper bending roll cylinders (upper bending roll cylinder 5, 45; upper bending roll cylinder 6, 46; upper bending roll cylinder 7, 47; and upper bending roll cylinder 8, 48) are the same and jointly controlled. Likewise, the rodless chamber pressures of the four lower bending roll cylinders (lower bending roll cylinder 5, 75; lower bending roll cylinder 6, 76; lower bending roll cylinder 7, 77; and lower bending roll cylinder 8, 78) are the same and jointly controlled.

[0040] When the rolling mill work rolls are in the state of roll shifting, the rodless chamber pressures of upper bending roll cylinder 1 (41), upper bending roll cylinder 3 (43), lower bending roll cylinder 2 (72), and lower bending roll cylinder 4 (74) are the same; the rodless chamber pressures of upper bending roll cylinder 2 (42), upper bending roll cylinder 4 (44), lower bending roll cylinder 1 (71), and lower bending roll cylinder 3 (73) are the same; the rodless chamber pressures of upper bending roll cylinder 5 (45), upper bending roll cylinder 7 (47), lower bending roll cylinder 6 (76), and lower bending roll cylinder 8 (78) are the same; the rodless chamber pressures of upper bending roll cylinder 6 (46), upper bending roll cylinder 8 (48), lower bending roll cylinder 5 (75), and lower bending roll cylinder 7 (77) are the same, and the resultant force position of the bending roll cylinders pressing on the same work roll bearing seat is consistent with the position of the bearing centerline inside the bearing seat.

[0041] In the description of this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positive bending roll device for a medium-thick plate rolling mill work roll, comprising four bending roll cylinder blocks (1) installed inside the mill stand (9), each bending roll cylinder block (1) having two upper bending roll cylinders for the upper roll bearing seat (3) and two lower bending roll cylinders for the lower roll bearing seat (6); the upper bending roll cylinders are installed in the upper cavity of the bending roll cylinder block (1), and the lower bending roll cylinders are installed in the lower cavity of the bending roll cylinder block (1); the upper bending roll cylinders and the corresponding lower bending roll cylinders are located on the same vertical line; Its features are: The upper cylinder piston rod (4) of the upper bending roller cylinder is connected to an upper guide plate (12). The upper guide plate (12) includes a top plate (121), an outer guide portion (122) located outside the top plate (121), and an inner guide portion (123) located inside the top plate (121). The top plate (121), the outer guide portion (122), and the inner guide portion (123) surround and form a downward-facing groove that is fastened to the top of the bending roller cylinder block (1). The upper cylinder piston rod (4) is connected to the top plate (121) and passes through the upper guide plate (12) to the upper roller bearing seat (3). The lower cylinder piston rod (7B) of the lower bending roller cylinder is connected to a lower guide plate (13) at its end, and the lower cylinder piston rod (7B) pushes the lower roller bearing seat (6) through the lower guide plate (13).

2. The positive bending roll device for work rolls of medium and heavy plate rolling mills as described in claim 1, characterized in that: Both the upper and lower bending roller cylinders utilize the bending roller block (1) as their cylinder bodies.

3. The positive bending roll device for medium and heavy plate rolling mills as described in claim 2, characterized in that: The lower guide plate (13) is movably inserted into the lower cavity of the bending roller block (1).

4. The positive bending roll device for work rolls of medium and heavy plate rolling mills as described in any one of claims 1-3, characterized in that: An outer guide plate (125) is provided between the outer guide portion (122) and the outer side wall of the bending roller block (1), and the outer guide plate (125) is connected to the outer guide portion (122). An inner guide plate (126) is provided between the inner guide portion (123) and the inner side wall of the bending roller block (1), and the inner guide plate (126) is connected to the inner guide portion (123).

5. The positive bending roll device for medium and heavy plate rolling mills as described in claim 4, characterized in that: The outer guide plate (125) and the outer guide part (122) are connected by a bolt assembly (127). The connecting bolt in the bolt assembly (127) passes through the countersunk hole on the outer guide plate (125) and the bolt hole on the outer guide part (122) in sequence and is then tightened with the connecting nut. The inner guide plate (126) and the inner guide part (123) are connected by a bolt assembly (127). The connecting bolt in the bolt assembly (127) passes through the countersunk hole on the inner guide plate (126) and the bolt hole on the inner guide part (123) in sequence and is then tightened with the connecting nut. An adjusting stud (128) is provided between the outer guide plate (125) and the outer guide portion (122). The adjusting stud (128) is threaded to the outer guide portion (122), and its end rests against the outer guide plate (125).

6. The positive bending roll device for work rolls of medium and heavy plate rolling mills as described in claim 4, characterized in that: The upper guide plate (12) also includes an end guide portion (124), which forms a turning L-shape with the top plate portion (121), and the end guide portion (124) is located between the side wall of the bending roller cylinder block (1) and the upper roller bearing seat (3). The bending roller block (1) has a notch on the side facing the upper roller bearing seat (3), and the end guide (124) is located in the notch.

7. The positive bending roll device for medium and heavy plate rolling mills as described in claim 4, characterized in that: A countersunk hole is provided at the top plate (121) of the upper guide plate (12) corresponding to the upper cylinder piston rod (4). A spacer ring (15) and a pressure plate (16) are provided in the countersunk hole. The connecting screw (14) passes through the pressure plate (16) and the spacer ring (15) in sequence and is screwed into the upper cylinder piston rod (4). The top of the spacer ring (15) protrudes from the stepped plane (17) of the countersunk hole. A countersunk through hole is provided at the corresponding position of the lower guide plate (13) and the upper cylinder piston rod (4). A spacer ring (15) and a pressure plate (16) are provided in the countersunk through hole. The connecting screw (14) passes through the pressure plate (16) and the spacer ring (15) in sequence and is screwed into the lower cylinder piston rod (7B). The top of the spacer ring (15) protrudes from the stepped plane (17) of the countersunk through hole.

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