Roll bending hydraulic cylinder and roll bending device for rolling mill

Abstract

The utility model provides a roll bending hydraulic cylinder and a roll bending device for a rolling mill, which comprise a cylinder body, a hydraulic cylinder, a hydraulic cylinder and a hydraulic cylinder, the lower end of the lower moving sleeve is movably connected to the inner side of the lower end of the mounting hole of the cylinder body; the upper end of the upper moving sleeve is movably connected to the inner side of the upper end of the mounting hole of the cylinder body, and the lower end of the upper moving sleeve is movably connected to the inner side of the upper end of the lower moving sleeve; a piston part at the upper end of the piston rod is installed on the inner side of the upper end of the upper moving sleeve, a connecting rod at the lower end of the piston rod is connected with the lower moving sleeve, and the piston part divides a first sliding hole in the inner side of the upper end of the upper moving sleeve into a rod cavity and a rodless cavity. The utility model has the beneficial effects that the synchronous movement of the upper moving sleeve and the lower moving sleeve can be realized by controlling the oil passage, and the pipeline is simple and easy to maintain compared with the traditional mode that two oil cylinders are respectively controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of rolling mills, in particular to a roll bending hydraulic cylinder and a roll bending device for a rolling mill. Background Art

[0002] As an important raw material in the steel processing industry, hot-rolled strip has increasingly stringent market requirements for its plate shape accuracy. Work roll bending technology is an important technical means to improve the plate shape, and its role in hot-rolled strip mills is becoming increasingly significant.

[0003] In the existing working roll bending device, the bending cylinder is divided into two parts, the upper bending cylinder and the lower bending cylinder. The following problems occur during use: first, the upper bending cylinder and the lower bending cylinder are controlled separately, and the oil circuit is complicated and inconvenient to maintain; second, during the bending operation, the cylinder rod of the bending cylinder directly presses the bearing seat. In the initial position, the center of the cylinder rod is aligned with the center of the bearing. When the working roll needs to move axially, the cylinder rod directly bears the relatively large radial force brought by the bearing seat, which can easily cause deformation of the cylinder rod, damage to the seal, and oil leakage; and when the working roll moves axially, the action point of the bending cylinder rod on the bearing seat no longer coincides with the bearing center, causing unbalanced load on the bearing and reducing the service life of the bearing. Utility Model Content

[0004] In view of this, the present invention aims to provide a roll bending hydraulic cylinder and a roll bending device for a rolling mill, in order to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] The utility model provides a hydraulic cylinder for bending a roll of a rolling mill, comprising:

[0007] A cylinder body, wherein a mounting hole is formed in the cylinder body;

[0008] a lower movable sleeve, the lower end of which is movably connected to the inner side of the lower end of the mounting hole of the cylinder body;

[0009] An upper movable sleeve, wherein the upper end of the upper movable sleeve is movably connected to the inner side of the upper end of the mounting hole of the cylinder body, and the lower end of the upper movable sleeve is movably connected to the inner side of the upper end of the lower movable sleeve;

[0010] The piston rod, the piston part at the upper end of the piston rod is installed on the inner side of the upper end of the upper movable sleeve, the connecting rod at the lower end of the piston rod is connected to the lower movable sleeve, and the piston part divides the first sliding hole on the inner side of the upper end of the upper movable sleeve into a rod cavity and a rodless cavity.

[0011] Furthermore, the cross section of the upper guide portion of the upper movable sleeve is an oblong structure, and the length direction of the oblong is arranged along the axial direction of the working roll;

[0012] An upper guide sleeve is provided between the upper guide portion of the movable sleeve and the mounting hole. An upper limit boss for limiting the upper guide sleeve is fixedly provided on the inner side of the upper end of the mounting hole. An upper pressure ring is provided on the upper end of the cylinder body. The upper pressure ring is connected to the cylinder body through bolts. The upper pressure ring presses the upper guide sleeve and the upper limit boss. A sealing ring is provided between the inner side of the upper pressure ring and the upper guide portion.

[0013] Furthermore, the first sliding hole in the upper guide portion is a circular hole, the piston portion is installed on the inner side of the first sliding hole, and a first sealing ring is provided on the outer side of the piston portion;

[0014] The lower end of the upper movable sleeve is a first connecting portion, which has a first connecting hole. The connecting rod of the piston rod is installed inside the first connecting hole, and a second sealing ring is provided on the outside of the connecting rod.

[0015] The first connecting hole is a circular hole, and the diameter of the piston portion is larger than the diameter of the connecting rod.

[0016] Furthermore, the lower end of the lower movable sleeve is a lower guide portion, the cross section of the lower guide portion is an oblong structure, the length direction of the oblong is arranged along the axial direction of the work roll, the cross section of the second connecting portion is a circle, and the diameter of the circle of the second connecting portion is smaller than the width of the lower guide portion;

[0017] The upper end of the lower movable sleeve is the second connecting part, which has a second connecting hole. The first connecting part is installed on the inner side of the second connecting hole. An inner guide sleeve is provided on the outer side of the first connecting part. The inner guide sleeve is pressed against the inner limit boss on the outer side of the first connecting part through an inner pressure ring.

[0018] Furthermore, the connecting rod is connected to the lower movable sleeve through a connecting rod, the connecting rod passes through the bottom end of the second sliding groove of the lower guide portion and is connected, and the bottom end of the second sliding groove is provided with an air vent;

[0019] Both end surfaces of the connecting rod are spherical, and the first connecting portion and the lower movable sleeve are provided with concave spherical pads;

[0020] The upper end of the connecting rod is connected to the first connecting portion through a first clamping plate, and there is a gap between the first clamping plate and the first connecting portion;

[0021] The lower end of the connecting rod is connected to the bottom end of the second sliding groove through the second clamping plate, and there is a gap between the second clamping plate and the bottom end of the second sliding groove.

[0022] Furthermore, the cover plate closes the upper end opening of the upper movable sleeve, the cover plate is provided with a first oil path communicating with the rodless chamber, and the cylinder body is provided with a second oil path communicating with the rod chamber.

[0023] Furthermore, an annular mounting boss corresponding to the second connecting portion is fixedly provided on the inner side of the mounting hole, and a middle guide sleeve is provided between the second connecting portion and the annular mounting boss;

[0024] The middle guide sleeve is installed on the limiting boss of the annular mounting boss through the middle pressure ring;

[0025] A lower guide sleeve is provided between the lower guide portion and the inner side of the lower end of the mounting hole. The lower guide sleeve is mounted on the limiting boss at the lower end of the mounting hole through a lower pressure ring.

[0026] A second aspect of the present invention provides a roll bending device using the roll bending hydraulic cylinder for a rolling mill as described in the first aspect, comprising:

[0027] A rolling mill bending roll hydraulic cylinder, wherein the upper movable sleeve of the rolling mill bending roll hydraulic cylinder supports the upper bearing seat of the upper working roll system, and the lower movable sleeve of the rolling mill bending roll hydraulic cylinder presses the lower bearing seat of the lower working roll system.

[0028] Furthermore, an upper pressure plate is fixedly provided on the lower end surface of the upper bearing seat, the area of ​​the upper pressure plate is smaller than the area of ​​the cover plate, and the center of the upper pressure plate corresponds to the center of gravity of the upper bearing seat;

[0029] A lower pressure plate is fixedly provided on the upper end surface of the lower bearing seat. The area of ​​the lower pressure plate is smaller than the area of ​​the lower end of the lower movable sleeve. The center of the lower pressure plate corresponds to the center of gravity of the lower bearing seat.

[0030] Furthermore, it also includes an oil passage plate, on which connecting oil passages are respectively connected to the first oil passage and the second oil passage.

[0031] Compared with the prior art, the hydraulic cylinder and device for bending rolls for a rolling mill described in the present invention have the following beneficial effects:

[0032] (1) The utility model discloses a hydraulic cylinder for bending rolls for a rolling mill, which can realize synchronous movement of an upper movable sleeve and a lower movable sleeve by controlling the oil flow in the oil circuit. Compared with the traditional method of controlling two oil cylinders separately, the pipeline is simple and easy to maintain.

[0033] (2) The utility model discloses a hydraulic cylinder for bending rolls for a rolling mill, wherein the piston rod and the seal are located inside the cylinder body, thereby avoiding the invasion of cooling water and other impurities during steel rolling. The oblong guide portion is provided to protect the piston rod from the radial force caused by the roll shifting, thereby greatly improving the service life of the parts and reducing the maintenance workload.

[0034] (3) The bending roll device described in the present invention always acts on the center of the bearing seat, which is not affected by the axial movement of the working roll, thus avoiding the unbalanced load on the working roll bearing and improving the service life of the working roll bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is a schematic cross-sectional structure diagram of a bending roller hydraulic cylinder according to an embodiment of the present utility model;

[0037] Figure 2 The embodiment of the present utility model Figure 1 Schematic diagram of the cross-section structure at AA in the middle;

[0038] Figure 3 This is a schematic diagram of the three-dimensional explosion structure of the upper movable sleeve and the lower movable sleeve according to an embodiment of the present utility model;

[0039] Figure 4 The embodiment of the present utility model Figure 1 Schematic diagram of the cross-section structure at the middle BB;

[0040] Figure 5 This is a structural schematic diagram of the roll bending device according to an embodiment of the present utility model;

[0041] Figure 6 This is a schematic diagram of the top view of the bending roller device described in an embodiment of the utility model.

[0042] Description of reference numerals:

[0043] 1. Bending roller hydraulic cylinder; 2. Upper working roll system; 3. Lower working roll system; 4. Oil plate; 101. Cylinder body; 1011. Step surface 2; 1012. Step surface 4; 102. Lower guide sleeve; 103. Middle guide sleeve; 104. Upper guide sleeve; 105. Lower movable sleeve; 1051. Second sliding groove; 1052. Air vent; 1053. Lower guide portion; 1054. Second connecting portion; 1055. Step surface 3; 106. Upper movable sleeve; 1 061. Inner guide sleeve; 1062. First sliding hole; 1063. First connecting hole; 1064. First oil circuit; 1065. Second oil circuit; 1066. Upper guide portion; 1067. First connecting portion; 1068. Step surface 1; 107. Piston rod; 1071. Piston portion; 1072. Connecting rod; 108. Connecting rod; 109. Clamping plate 1; 110. Clamping plate 2; 111. Concave spherical pad; 112. Lower pressure ring; 113. Upper pressure ring. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0048] like Figures 1 to 4 As shown, a bending roller hydraulic cylinder 1 for a rolling mill comprises: a cylinder body 101, wherein a mounting hole is opened in the cylinder body 101; a lower movable sleeve 105, wherein the lower end of the lower movable sleeve 105 is movably connected to the inner side of the lower end of the mounting hole of the cylinder body 101; an upper movable sleeve 106, wherein the upper end of the upper movable sleeve 106 is movably connected to the inner side of the upper end of the mounting hole of the cylinder body 101, and the lower end of the upper movable sleeve 106 is movably connected to the inner side of the upper end of the lower movable sleeve 105; a piston rod 107, wherein the piston part 1071 at the upper end of the piston rod 107 is mounted on the inner side of the upper end of the upper movable sleeve 106, and the connecting rod 1072 at the lower end of the piston rod 107 is connected to the lower movable sleeve 105, and the piston part 1071 divides the first sliding hole 1062 on the inner side of the upper end of the upper movable sleeve 106 into a rod cavity and a rodless cavity.

[0049] The upper guide portion 1066 of the upper movable sleeve 106 has an oblong cross-section, with its length oriented along the axial direction of the work roll. Compared to a circular shape, the oblong shape increases the area of ​​the upper end surface of the upper movable sleeve 106 and the lower end surface of the lower movable sleeve 105, thereby increasing the area of ​​the bending roll force-bearing surface. This also prevents rotation of the upper and lower movable sleeves 106, 105 during their upward and downward sliding motion. The oblong shape, oriented along the axial direction of the work roll, fully accounts for the potential movement of the work roll during use.

[0050] An upper guide sleeve 104 is provided between the upper guide portion 1066 of the movable sleeve and the mounting hole. An upper limit boss for limiting the position of the upper guide sleeve 104 is fixedly provided on the inner side of the upper end of the mounting hole. An upper pressure ring 113 is provided on the upper end of the cylinder body 101. The upper pressure ring 113 is connected to the cylinder body 101 by bolts. The upper pressure ring 113 presses the upper guide sleeve 104 against the upper limit boss. A sealing ring is provided between the inner side of the upper pressure ring 113 and the upper guide portion 1066. The inner side of the upper guide sleeve 104 matches the shape of the upper guide portion 1066 of the upper movable sleeve 106. A radial sealing ring is provided inside the upper guide sleeve 104 to prevent water and dirt from entering the interior of the cylinder body 101.

[0051] Furthermore, the first sliding hole 1062 in the upper guide portion 1066 is a circular hole, the piston portion 1071 is installed inside the first sliding hole 1062, and a first sealing ring is provided outside the piston portion 1071;

[0052] The lower end of the upper movable sleeve 106 is a first connecting portion 1067, which has a first connecting hole 1063. The connecting rod 1072 of the piston rod 107 is installed inside the first connecting hole 1063, and a second sealing ring is provided on the outside of the connecting rod 1072.

[0053] The first connecting hole 1063 is a circular hole, and the diameter of the piston portion 1071 is larger than the diameter of the connecting rod 1072.

[0054] Furthermore, the lower end of the lower movable sleeve 105 is a lower guide portion 1053, the cross section of the lower guide portion 1053 is an oblong structure, the length direction of the oblong is arranged along the axial direction of the work roll, the cross section of the second connecting portion 1054 is a circle, and the diameter of the circular cross section of the second connecting portion 1054 is smaller than the width of the lower guide portion 1053;

[0055] The upper end of the lower movable sleeve 105 is a second connecting part 1054, and a second connecting hole is opened on the second connecting part 1054. The first connecting part 1067 is installed on the inner side of the second connecting hole. An inner guide sleeve 1061 is provided on the outer side of the first connecting part 1067. The inner guide sleeve 1061 is pressed onto the inner limit boss on the outer side of the first connecting part 1067 through an inner pressure ring.

[0056] The connecting rod 1072 is connected to the lower movable sleeve 105 through the connecting rod 108, and the connecting rod 108 passes through the bottom end of the second sliding groove 1051 of the lower guide part 1053 and is connected, and the bottom end of the second sliding groove 1051 is provided with an air vent 1052; the two end faces of the connecting rod 108 are both spherical surfaces, and the first connecting part 1067 and the lower movable sleeve 105 are both provided with a concave spherical pad 111 plate; the upper end of the connecting rod 108 is connected to the first connecting part 1067 through a clamping plate 109, and there is a gap between the clamping plate 109 and the first connecting part 1067; the lower end of the connecting rod 108 is connected to the bottom end of the second sliding groove 1051 through a clamping plate 2 110, and there is a gap between the clamping plate 2 110 and the bottom end of the second sliding groove 1051. The connecting rod 108 and the lower movable sleeve 105 form a flexible connection, which allows the connecting rod 108 to have a certain angle of axial deviation during operation to offset the influence of processing errors and installation errors on the axial sliding of related parts.

[0057] The cover plate closes the upper end opening of the upper movable sleeve 106 , and a first oil passage 1064 communicating with the rodless chamber is opened on the cover plate, and a second oil passage 1065 communicating with the rod chamber is opened on the cylinder body 101 .

[0058] An annular mounting boss corresponding to the second connecting portion 1054 is fixedly provided on the inner side of the mounting hole. A middle guide sleeve 103 is disposed between the second connecting portion 1054 and the annular mounting boss. The middle guide sleeve 103 is mounted on the limiting boss of the annular mounting boss via a middle pressure ring. A lower guide sleeve 102 is disposed between the lower guide portion 1053 and the inner side of the lower end of the mounting hole. The lower guide sleeve 102 is mounted on the limiting boss at the lower end of the mounting hole via a lower pressure ring 112. The inner side of the lower guide sleeve 102 matches the lower guide portion 1053, which is provided with the lower movable sleeve 105. A sealing ring is disposed within the lower guide sleeve 102 to prevent water and dirt from entering the interior of the cylinder body 101. The end surface of the annular mounting convex adjacent to the upper movable sleeve 106 is step surface two 1011, and the transition surface between the first connecting portion 1067 and the upper guide portion 1066 is step surface one 1068; the end surface of the annular mounting convex adjacent to the upper movable sleeve 106 is step surface three 1055, and the transition surface between the second connecting portion 1054 and the lower guide portion 1053 is step surface four 1012; step surface one 1068 and step surface two 1011 together constitute the mechanical limiting structure of the lower limit position when the upper movable sleeve 106 slides up and down, and step surface three 1055 and step surface four 1012 together constitute the mechanical limiting structure of the upper limit position when the lower movable sleeve 105 slides up and down.

[0059] A roll bending device using a rolling mill roll bending hydraulic cylinder 1 comprises: a rolling mill roll bending hydraulic cylinder 1, wherein the upper movable sleeve 106 of the rolling mill roll bending hydraulic cylinder 1 supports the upper bearing seat 21 of the upper working roll system 2, and the lower movable sleeve 105 of the rolling mill roll bending hydraulic cylinder 1 presses against the lower bearing seat 31 of the lower working roll system 3. There are four roll bending hydraulic cylinders 1, two of which are fixedly mounted on the operating side frame through cylinder bodies 101, and the other two are fixedly mounted on the transmission side frame through cylinder bodies 101. The upper working roll system 2 and the lower working roll system 3 are arranged inside the window formed after the roll bending hydraulic cylinder 1 is installed. The upper bearing seat 21 has protruding flange structures on both sides of the upper portion, which correspond to the load-bearing surfaces of the upper movable sleeve 106. The lower bearing seat 31 has protruding flange structures on both sides of the lower portion, which correspond to the load-bearing surfaces of the lower movable sleeve 105.

[0060] The upper movable sleeves 106 of the four bending roll hydraulic cylinders 1 extend simultaneously, respectively pressing the flanges of the corresponding upper bearing seats 21, and applying the bending roll force to the upper working roll 22 through the upper bearing seats 21;

[0061] The lower movable sleeves 105 of the four bending roll hydraulic cylinders 1 extend out, respectively pressing the flanges of the corresponding lower bearing seats 31 , and applying the bending roll force to the lower working roll 32 through the lower bearing seats 31 .

[0062] An upper pressure plate 23 is fixedly provided on the lower end surface of the upper bearing seat 21. The area of ​​the upper pressure plate 23 is smaller than the area of ​​the cover plate, and the center of the upper pressure plate 23 corresponds to the center of gravity of the upper bearing seat 21; a lower pressure plate 33 is fixedly provided on the upper end surface of the lower bearing seat 31. The area of ​​the lower pressure plate 33 is smaller than the area of ​​the lower end of the lower movable sleeve 105, and the center of the lower pressure plate 33 corresponds to the center of gravity of the lower bearing seat 31. The surface area of ​​the upper pressure plate 23 is smaller than the bearing surface area of ​​the upper movable sleeve 106, and when the upper work roll system 2 moves axially, the upper pressure plate 23 is always located within the bearing surface range of the upper movable sleeve 106, so that the bending roll force applied by the upper movable sleeve 106 to the upper bearing seat 21 is always located at the center of the bearing, thereby avoiding the occurrence of unbalanced load on the bearing of the upper work roll system 2; the surface area of ​​the lower pressure plate 33 is smaller than the bearing surface area of ​​the lower movable sleeve 105, and when the lower work roll system 3 moves axially, the lower pressure plate 33 is always located within the bearing surface range of the lower movable sleeve 105, so that the bending roll force applied by the lower movable sleeve 105 to the lower bearing seat 31 is always located at the center of the bearing, thereby avoiding the occurrence of unbalanced load on the bearing of the lower work roll system 3. The upper work roll 22 is rotatably connected to the upper bearing seat 21 at both ends, and the lower work roll 32 is rotatably connected to the lower bearing seat 31 at both ends.

[0063] The upper movable sleeve 106 further includes an oil passage plate 4 having connecting oil passages respectively connected to the first oil passage 1064 and the second oil passage 1065. The oil passage plate 4 is L-shaped, and the internal connecting oil passages are provided with oil pipe interfaces on the outside. The oil passage plate 4 is fixedly mounted on the upper end surface of the upper movable sleeve 106 and is connected to the first oil passage 1064 and the second oil passage 1065, so that the oil supply pipeline of the bending roll hydraulic cylinder 1 can be arranged on the outside of the frame.

[0064] Work process;

[0065] During implementation of this solution, when oil is flowing through the first oil passage 1064, the upper movable sleeve 106 and the lower movable sleeve 105 simultaneously extend outward, the upper movable sleeve 106 moves upward, and its upper end surface presses against the upper bearing seat 21. The lower movable sleeve 105 moves downward, and its lower end surface presses against the lower bearing seat 31. The roll bending cylinder simultaneously applies a bending force to the bearing seat of the upper work roll 22 and the bearing seat of the lower work roll 32. The bending forces are equal in magnitude and opposite in direction. When oil is flowing through the first oil passage 1064, the upper movable sleeve 106 and the lower movable sleeve 105 simultaneously retract.

[0066] Beneficial effect: by controlling the oil flow in the oil circuit, the upper movable sleeve 106 and the lower movable sleeve 105 can be moved synchronously. Compared with the traditional two oil cylinders controlled separately, the pipeline is simple and easy to maintain, and the bending roll force is the same, which improves the bending roll effect.

[0067] The piston rod 107 and the seal are located inside the cylinder 101, which prevents the invasion of cooling water and other impurities during steel rolling. The oblong guide portion prevents the piston rod 107 from the radial force caused by roller shifting, greatly improving the life of the parts and reducing the maintenance workload.

[0068] The bending roll force always acts on the bearing center of the bearing seat and is not affected by the axial movement of the work roll, thus avoiding unbalanced load on the work roll bearing and increasing the service life of the work roll bearing.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic cylinder for bending rolls of a rolling mill, characterized in that: include: A cylinder body (101), wherein a mounting hole is formed in the cylinder body (101); A lower movable sleeve (105), the lower end of which is movably connected to the inner side of the lower end of the mounting hole of the cylinder body (101); An upper movable sleeve (106), wherein the upper end of the upper movable sleeve (106) is movably connected to the inner side of the upper end of the mounting hole of the cylinder body (101), and the lower end of the upper movable sleeve (106) is movably connected to the inner side of the upper end of the lower movable sleeve (105); A piston rod (107), wherein the piston portion (1071) at the upper end of the piston rod (107) is mounted on the inner side of the upper end of the upper movable sleeve (106), and a connecting rod (1072) at the lower end of the piston rod (107) is connected to the lower movable sleeve (105), and the piston portion (1071) separates the first sliding hole (1062) on the inner side of the upper end of the upper movable sleeve (106) into a rod cavity and a rodless cavity.

2. A rolling mill bending hydraulic cylinder according to claim 1, characterized in that: The cross section of the upper guide portion (1066) of the upper movable sleeve (106) is an oblong structure, and the length direction of the oblong is arranged along the axial direction of the working roller; An upper guide sleeve (104) is provided between the upper guide portion (1066) of the movable sleeve and the mounting hole, an upper limit boss for limiting the upper guide sleeve (104) is fixedly provided on the inner side of the upper end of the mounting hole, an upper pressure ring (113) is provided on the upper end of the cylinder body (101), the upper pressure ring (113) is connected to the cylinder body (101) through bolts, the upper pressure ring (113) presses the upper guide sleeve (104) and the upper limit boss, and a sealing ring is provided between the inner side of the upper pressure ring (113) and the upper guide portion (1066).

3. A rolling mill bending hydraulic cylinder according to claim 2, characterized in that: The first sliding hole (1062) in the upper guide portion (1066) is a circular hole, the piston portion (1071) is installed on the inner side of the first sliding hole (1062), and a first sealing ring is provided on the outer side of the piston portion (1071); The lower end of the upper movable sleeve (106) is a first connecting portion (1067), a first connecting hole (1063) is formed on the first connecting portion (1067), a connecting rod (1072) of the piston rod (107) is installed on the inner side of the first connecting hole (1063), and a second sealing ring is provided on the outer side of the connecting rod (1072); The first connecting hole (1063) is a circular hole, and the diameter of the piston portion (1071) is larger than the diameter of the connecting rod (1072).

4. A rolling mill bending hydraulic cylinder according to claim 3, characterized in that: The lower end of the lower movable sleeve (105) is a lower guide portion (1053), the cross section of the lower guide portion (1053) is an oblong structure, the length direction of the oblong is arranged along the axial direction of the working roller, the cross section of the second connecting portion (1054) is a circle, and the diameter of the circular cross section of the second connecting portion (1054) is smaller than the width of the lower guide portion (1053); The upper end of the lower movable sleeve (105) is a second connecting portion (1054), and a second connecting hole is opened on the second connecting portion (1054). The first connecting portion (1067) is installed on the inner side of the second connecting hole. An inner guide sleeve (1061) is provided on the outer side of the first connecting portion (1067). The inner guide sleeve (1061) is pressed against the inner limiting boss on the outer side of the first connecting portion (1067) through an inner pressure ring.

5. A rolling mill bending hydraulic cylinder according to claim 4, characterized in that: The connecting rod (1072) is connected to the lower movable sleeve (105) through a connecting rod (108), and the connecting rod (108) passes through the bottom end of the second sliding groove (1051) of the lower guide portion (1053) and is connected. The bottom end of the second sliding groove (1051) is provided with an air vent (1052); Both end surfaces of the connecting rod (108) are spherical surfaces, and the first connecting portion (1067) and the lower movable sleeve (105) are both provided with concave spherical pads (111); The upper end of the connecting rod (108) is connected to the first connecting portion (1067) via a first clamping plate (109), and a gap exists between the first clamping plate (109) and the first connecting portion (1067); The lower end of the connecting rod (108) is connected to the bottom end of the second sliding groove (1051) through the second clamping plate (110), and a gap exists between the second clamping plate (110) and the bottom end of the second sliding groove (1051).

6. A rolling mill roll bending hydraulic cylinder according to claim 5, characterized in that: The cover plate closes the upper end opening of the upper movable sleeve (106), the cover plate is provided with a first oil path (1064) communicating with the rodless chamber, and the cylinder body (101) is provided with a second oil path (1065) communicating with the rod chamber.

7. The hydraulic cylinder for bending rolls of a rolling mill according to claim 5, characterized in that: An annular mounting boss corresponding to the second connecting portion (1054) is fixedly provided on the inner side of the mounting hole, and a middle guide sleeve (103) is provided between the second connecting portion (1054) and the annular mounting boss; The middle guide sleeve (103) is mounted on the limiting boss of the annular mounting boss via a middle pressure ring; A lower guide sleeve (102) is provided between the lower guide portion (1053) and the inner side of the lower end of the mounting hole. The lower guide sleeve (102) is mounted on the limiting boss at the lower end of the mounting hole via a lower pressure ring (112).

8. A roll bending device using the roll bending hydraulic cylinder for a rolling mill according to any one of claims 1 to 7, characterized in that: include: A rolling mill bending roll hydraulic cylinder (1) is provided, wherein an upper movable sleeve (106) of the rolling mill bending roll hydraulic cylinder (1) supports an upper bearing seat (21) of an upper working roll system (2), and a lower movable sleeve (105) of the rolling mill bending roll hydraulic cylinder (1) presses against a lower bearing seat (31) of a lower working roll system (3).

9. A roll bending device according to claim 8, characterized in that: An upper pressure plate (23) is fixedly provided on the lower end surface of the upper bearing seat (21), the area of ​​the upper pressure plate (23) is smaller than the area of ​​the cover plate, and the center of the upper pressure plate (23) corresponds to the center of gravity of the upper bearing seat (21); A lower pressure plate (33) is fixedly provided on the upper end surface of the lower bearing seat (31), the area of ​​the lower pressure plate (33) is smaller than the area of ​​the lower end of the lower movable sleeve (105), and the center of the lower pressure plate (33) corresponds to the center of gravity of the lower bearing seat (31).

10. The roll bending device according to claim 8, characterized in that: It also includes an oil passage plate (4), on which connecting oil passages respectively connected to the first oil passage (1064) and the second oil passage (1065) are opened.

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