Roll bending hydraulic cylinder and roll bending device for rolling mill

Abstract

The invention provides a roll bending hydraulic cylinder and a roll bending device for a rolling mill, and the roll bending hydraulic cylinder comprises a cylinder body in which a mounting hole is formed; 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 device has the beneficial effects that synchronous movement of the upper moving sleeve and the lower moving sleeve can be achieved by controlling oil passing of an oil way, and compared with a traditional mode that two oil cylinders are controlled separately, the pipeline is simple and easy to maintain.

Description

Technical Field

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

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

[0003] In the existing working roll bending device, the bending cylinder is divided into an upper bending cylinder and a 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, the cylinder rod of the bending cylinder directly presses the bearing seat during the bending operation. 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 cylinder rod of the bending cylinder on the bearing seat no longer coincides with the center of the bearing, causing unbalanced load on the bearing and reducing the service life of the bearing. Summary of the invention

[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] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] In one aspect, the present invention 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, and 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, a first connecting hole is formed on the first connecting portion, a connecting rod of the piston rod is installed on the inner side of the first connecting hole, and a second sealing ring is provided on the outer side 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] Further, 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 working 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 a 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 onto 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 penetrates the bottom end of the second sliding groove of the lower guide portion and is connected, and a vent hole is opened at the bottom end of the second sliding groove;

[0019] Both end surfaces of the connecting rod are spherical surfaces, 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 clamping plate 1, and there is a gap between the clamping plate 1 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, a first oil path connected to the rodless chamber is opened on the cover plate, and a second oil path connected to the rod chamber is opened on the cylinder body.

[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, and the lower guide sleeve is installed 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 against 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 arranged 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, and 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 respectively connected to the first oil passage and the second oil passage are opened.

[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 hydraulic cylinder for bending rolls for a rolling mill described in the present invention can realize the synchronous movement of the upper movable sleeve and the 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 invention relates to 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 arranged to protect the piston rod from the radial force caused by roll shifting, thereby greatly improving the service life of the parts and reducing the maintenance workload.

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

[0035] The accompanying drawings constituting a part of the present invention 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 an improper limitation of the present invention. In the accompanying drawings:

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

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

[0038] Figure 3 It 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 invention;

[0039] Figure 4 For the embodiment of the present invention Figure 1 Schematic diagram of the cross-section structure at BB in the middle;

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

[0041] Figure 6 It is a schematic diagram of the top view of the structure of the bending roller device described in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Bending roller hydraulic cylinder; 2. Upper working roller system; 3. Lower working roller 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 part; 1054. Second connecting part; 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 part; 1067. first connecting part; 1068. step surface one; 107. piston rod; 1071. piston part; 1072. connecting rod; 108. connecting rod; 109. clamping plate one; 110. clamping plate two; 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 in the embodiments may 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like 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 the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction 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 a 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 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 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 roll; compared with the circular shape, the oblong shape can increase the upper end surface of the upper movable sleeve 106 and the lower end surface of the lower movable sleeve 105, that is, increase the bending roll force bearing surface area, and at the same time prevent the upper movable sleeve 106 and the lower movable sleeve 105 from rotating during the up and down sliding process. The length direction of the oblong shape is arranged along the axial direction of the working roll, which fully considers the movement of the working 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 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 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. The inner side of the upper guide sleeve 104 matches the shape of the upper guide portion 1066 of the upper movable sleeve 106, and a radial sealing ring is provided in 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 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;

[0052] The lower end of the upper movable sleeve 106 is a first connecting portion 1067, and a first connecting hole 1063 is formed on the first connecting portion 1067. A connecting rod 1072 of the piston rod 107 is installed inside the first connecting hole 1063, and a second sealing ring is provided outside 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] Further, 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 roll, the cross section of the second connecting portion 1054 is a circle, and the diameter of the circle 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 a vent hole 1052; the two end faces of the connecting rod 108 are 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 formed on the cover plate, and a second oil passage 1065 communicating with the rod chamber is formed on the cylinder body 101 .

[0058] An annular mounting boss corresponding to the second connecting portion 1054 is fixedly arranged on the inner side of the mounting hole, and a middle guide sleeve 103 is arranged between the second connecting portion 1054 and the annular mounting boss; the middle guide sleeve 103 is installed on the limiting boss of the annular mounting boss through a middle pressure ring; a lower guide sleeve 102 is arranged between the lower guide portion 1053 and the inner side of the lower end of the mounting hole, and the lower guide sleeve 102 is installed on the limiting boss at the lower end of the mounting hole through a lower pressure ring 112. The inner side of the lower guide sleeve 102 matches the lower guide portion 1053 with the lower movable sleeve 105, and a sealing ring is arranged inside the lower guide sleeve 102 to prevent water and dirt from entering the cylinder body 101. The end surface of the annular mounting convexity 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 convexity 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 limit 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 limit 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 an upper movable sleeve 106 of the rolling mill roll bending 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 roll bending hydraulic cylinder 1 presses against a lower bearing seat 31 of a lower working roll system 3. There are four roll bending hydraulic cylinders 1, two of which are fixedly mounted on an operating side frame through a cylinder body 101, and the other two are fixedly mounted on a transmission side frame through a cylinder body 101, and the upper working roll system 2 and the lower working roll system 3 are arranged inside a window formed after the roll bending hydraulic cylinder 1 is installed, and both sides of the upper part of the upper bearing seat 21 have protruding flange structures corresponding to the load-bearing surface of the upper movable sleeve 106, and both sides of the lower part of the lower bearing seat 31 have protruding flange structures corresponding to the load-bearing surface 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, and 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, and 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 working 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 the bearing eccentricity of the upper working 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 working 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 the bearing eccentricity of the lower working roll system 3. The two ends of the upper working roll 22 are rotatably connected to the upper bearing seat 21, and the two ends of the lower working roll 32 are rotatably connected to the lower bearing seat 31.

[0063] It also includes an oil-passing plate 4, on which connecting oil passages respectively connected to the first oil passage 1064 and the second oil passage 1065 are opened. The oil-passing plate 4 is L-shaped, and an oil pipe interface is arranged on the outside of the internal connecting oil passage, which is fixedly mounted on the upper end surface of the upper movable sleeve 106 and 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] When this solution is implemented, when the first oil circuit 1064 is passed through oil, the upper movable sleeve 106 and the lower movable sleeve 105 extend outward at the same time, the upper movable sleeve 106 moves upward, and the upper end surface presses the upper bearing seat 21, the lower movable sleeve 105 moves downward, and the lower end surface presses the lower bearing seat 31, and the bending roll cylinder applies a bending roll force to the upper working roll 22 bearing seat and the lower working roll 32 bearing seat at the same time, and the bending roll forces are the same in magnitude and opposite in direction. When the first oil circuit 1064 is passed through oil, the upper movable sleeve 106 and the lower movable sleeve 105 retract at the same time.

[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 method of separately controlling the two oil cylinders, 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 avoids the invasion of cooling water and other impurities during steel rolling. The oblong guide part is set to protect the piston rod 107 from the radial force caused by roller shifting, which greatly improves the service life of parts and reduces 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 working roll, thus avoiding unbalanced load on the working roll bearing and increasing the service life of the working 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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 specification 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 substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bending roll hydraulic cylinder for 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 a piston portion (1071) at the upper end of the piston rod (107) is installed 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) 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.

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 roll; 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) by 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 part (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 roll, the cross section of the second connecting portion (1054) is a circle, and the diameter of the circle 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 onto the inner limit 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 thereto, and a vent hole (1052) is provided at the bottom end of the second sliding groove (1051); 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 a concave spherical pad (111); The upper end of the connecting rod (108) is connected to the first connecting portion (1067) via a clamping plate (109), and a gap exists between the 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 there is a gap between the second clamping plate (110) and the bottom end of the second sliding groove (1051).

6. A rolling mill 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. A rolling mill bending hydraulic cylinder according to claim 5, characterized in that: An annular mounting boss corresponding to the second connecting portion (1054) is fixedly arranged on the inner side of the mounting hole, and a middle guide sleeve (103) is arranged between the second connecting portion (1054) and the annular mounting boss; The middle guide sleeve (103) is installed on the limiting boss of the annular mounting boss through 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 as claimed in any one of claims 1 to 7, characterized in that: include: A rolling mill bending roll hydraulic cylinder (1), 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. A 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.

Images