Pressurizing device

Abstract

To provide a pressurizing device that is effective in improving durability.SOLUTION: Pressurizing devices 33 and 43 comprise: cylinders 110; pistons 120 that protrude from the cylinders 110 toward an object to be pressurized and move forward or backward with respect to the object to be pressurized, by driving pressure in the cylinders 110; and load receivers 130 that are interposed between the pistons 120 and the object to be pressurized. The pistons 120 have concave parts 122 that open toward the object to be pressurized and store the load receivers 130. The concave parts 122 have bottom surfaces 123 that oppose to the object to be pressurized through the load receivers 130 and are formed to slide the load receivers 130 along the bottom surfaces 123.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This disclosure relates to a pressurizing device.

Background Art

[0002] Patent Document 1 discloses a hydraulic servo cylinder including a cup-shaped cylinder body, a disk-shaped piston that slides up and down within the cylinder body, and a large-diameter rod integrally provided at the center of the upper surface of the piston. A load receiving seat on which the lower surface of the roll chuck of the rolling mill is placed is formed at the upper end of the rod.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] This disclosure provides a pressurizing device effective for improving durability.

Means for Solving the Problems

[0005] The pressurizing device according to one aspect of this disclosure includes a cylinder, a piston that protrudes from the cylinder toward the object to be pressurized and moves forward or backward with respect to the object to be pressurized by the driving pressure within the cylinder, and a load receptor interposed between the piston and the object to be pressurized. The piston has a recess that opens toward the object to be pressurized and houses the load receptor. The recess has a bottom surface facing the object to be pressurized through the load receptor, and is formed so as to slide the load receptor along the bottom surface.

[0006] In pressurizing devices, a lateral load perpendicular to the piston's forward or backward movement may act on the pressurizing device from the object being pressed. When a lateral load acts on the pressurizing device from the object being pressed, an overturning moment is generated in the piston, making wear on the piston's guide portion more likely. In contrast, with this pressurizing device, the lateral load acting on the load-bearing body from the object being pressed acts on the piston at the bottom surface of the recess. Therefore, compared to the case where a lateral load acts directly on the piston from the object being pressed, the overturning moment acting on the piston due to the lateral load is reduced. Furthermore, since the lateral load is weakened by the sliding of the load-bearing body in response to the lateral load, situations in which an overturning moment caused by the lateral load continuously acts on the piston are less likely to occur. Consequently, this is effective in improving durability.

[0007] The cylinder has a first bearing that guides the piston, and a second bearing located between the first bearing and the object being pressurized, which also guides the piston, and the bottom surface may be located between the first bearing and the second bearing. In this case, the lateral load is distributed between the first bearing and the second bearing, so that wear on the first and second bearings is suppressed.

[0008] The object being pressed may be the chock of a rolling mill roll. The effect of improving durability becomes more pronounced when applied to rolling equipment subjected to heavy loads.

[0009] The load-bearing body has a first block in contact with the bottom surface and a second block interposed between the first block and the object to be pressed. The first block has a facing surface that faces the object to be pressed via the second block, and is formed to allow the second block to slide along the facing surface. The facing surface may be curved to tilt the second block in response to its sliding. An overturning moment on the piston can also be generated by a pressing load acting in the forward or backward direction of the piston. For example, an overturning moment on the piston can be generated if the pressing load is uneven in a plane perpendicular to the forward or backward direction. In contrast, the tilting of the second block suppresses the overturning moment acting on the piston due to the unevenness of the pressing load. Therefore, it is even more effective in improving durability.

[0010] The object to be pressed is the chock of the rolling roll, and the opposing surface may be curved such that it tilts the second block about an axis parallel to the feed direction of the rolled material, in accordance with the displacement of the second block in a direction parallel to the rolling roll. In this case, the overturning moment acting on the piston due to the deflection of the rolling roll is suppressed.

[0011] The opposing surface may be further curved to tilt the second block about an axis parallel to the rolling roll, in accordance with the displacement of the second block in a direction parallel to the feed direction of the rolled material. In this case, the overturning moment acting on the piston due to the force acting from the rolled material on the rolling roll is suppressed.

[0012] The opposing surface may be located within the recess. In this case, the overturning moment acting on the piston due to the lateral load acting on the opposing surface is further suppressed.

[0013] The system may further include one or more elastic members positioned between the first block and the piston so as the first block approaches the inner circumference of the recess, causing it to elastically deform. If the pressurizing device is installed with the first block biased in one direction within the recess, it may not be possible to sufficiently suppress the overturning moment acting on the piston when a lateral load is applied in that direction. In contrast, the bias of the first block within the recess can be suppressed by one or more elastic members.

[0014] The opposing surfaces are located within the recess, the first block has a peripheral wall surrounding the second block, and one or more elastic members may be provided between the peripheral wall and the inner circumference of the recess. In this case, the elastic members can be placed near the opening of the recess, thus improving maintainability.

[0015] The cylinder is positioned below the chock, and the piston protrudes upward from the cylinder and is configured to hold lubricating fluid in the recess. The first block may further have fluid-conducting openings that guide the lubricating fluid into the circumferential wall. By retaining the lubricating fluid, high lubricity can be maintained on both the bottom and opposing surfaces of the recess, further suppressing the overturning moment acting on the piston.

[0016] The device may further have a centering section that holds the load-bearing body away from the inner circumference of the recess over its entire circumference when no force perpendicular to the forward or backward movement of the piston is acting on the load-bearing body. If the pressurizing device is installed with the first block biased in one direction within the recess, it may not be possible to sufficiently suppress the overturning moment acting on the piston when a lateral load is applied in that direction. In contrast, the centering section can suppress the bias of the first block within the recess.

[0017] The centering section may include one or more elastic members positioned between the load-bearing body and the piston so as the load-bearing body approaches the inner circumference of the recess, it undergoes elastic deformation. By using one or more elastic members, the configuration of the centering section can be simplified.

[0018] The load receptor has a first part and a second part located between the first part and the bottom surface, and the outer periphery of the second part may be located outside the outer periphery of the first part. In this case, when the load receptor collides with the inner periphery of the concave portion, the tipping moment acting on the piston can be suppressed.

[0019] The cylinder is disposed below the object to be pressurized, and the piston may protrude upward from the cylinder and be configured to hold a lubricating fluid in the concave portion. By holding the lubricating fluid, the lubricity of the bottom surface of the concave portion can be maintained high, and the tipping moment acting on the piston can be further suppressed.

Advantages of the Invention

[0020] According to the present disclosure, a pressurizing device effective for improving durability can be provided.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic diagram illustrating the configuration of a rolling device. [Figure 2] It is a side view of the rolling device of FIG. 1. [Figure 3] It is a cross-sectional view illustrating the configuration of a pressurizing device. [Figure 4] It is a plan view of the pressurizing device of FIG. 3. [Figure 5] It is a schematic diagram showing a modified example of the rolling device.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, embodiments will be described in detail with reference to the drawings. In the description, the same reference numerals are given to the same elements or elements having the same function, and redundant descriptions are omitted.

[0023] 〔Rolling Device〕 The rolling mill 1 shown in Figures 1 and 2 is a device for rolling slabs. Hereinafter, the slab before rolling, the molded body obtained by rolling the slab, and the molded body in an intermediate state between these will all be referred to as "rolled material." The rolling mill 1 comprises an upper rolling roll 10, a lower rolling roll 20, a drive-side stand 30, and a work-side stand 40.

[0024] The upper rolling roll 10 and the lower rolling roll 20 are arranged parallel to each other, one above the other. The upper rolling roll 10 has a roll body 11, a roll neck 12, and a roll neck 13. The roll body 11 extends horizontally and contacts the upper surface of the rolled material 9. The roll neck 12 protrudes from one end of the roll body 11 along the central axis 14 of the roll body 11 and is connected to a drive source (not shown). The roll neck 13 protrudes from the other end of the roll body 11 along the central axis 14 of the roll body 11.

[0025] The lower rolling roll 20 has a roll body 21, a roll neck 22, and a roll neck 23. The roll body 21 extends parallel to the roll body 11 and contacts the lower surface of the rolled material 9. The roll neck 22 protrudes from one end of the roll body 21 along the central axis 24 of the roll body 21 and is connected to a drive source (not shown). The roll neck 23 protrudes from the other end of the roll body 21 along the central axis 24 of the roll body 21.

[0026] The drive stand 30 supports the roll neck 12 of the upper rolling roll 10 and the roll neck 22 of the lower rolling roll 20. The drive stand 30 includes an upper roll chock 31, a lower roll chock 32, a pressurizing device 33, and a pressurizing device 34. The upper roll chock 31 holds the roll neck 12 so that it can rotate around the central axis 14 of the roll body 11. The lower roll chock 32 holds the roll neck 22 so that it can rotate around the central axis 24 of the roll body 21.

[0027] The pressurizing devices 33 and 34 pressurize the object to be pressed. For example, pressurizing device 33 is positioned below the lower roll chock 32 (object to be pressed) and functions as an upward pressurizing device that pressurizes the lower roll chock 32 upward. The configuration of pressurizing device 33 will be described later. Pressurizing device 34 is positioned above the upper roll chock 31 (object to be pressed) and functions as a downward pressurizing device that pressurizes the upper roll chock 31 downward. Pressurizing device 34 is, for example, a ball screw type linear actuator, and by rotating the ball screw, it moves the pressurizing rod 36 forward (downward) toward the upper roll chock 31, thereby pressurizing the upper roll chock 31 downward.

[0028] The housing 35 holds the upper roll chock 31, the lower roll chock 32, and the pressurizing devices 33 and 34.

[0029] The working stand 40 supports the roll neck 13 of the upper rolling roll 10 and the roll neck 23 of the lower rolling roll 20. The working stand 40 includes an upper roll chock 41, a lower roll chock 42, a pressurizing device 43, and a pressurizing device 44. The upper roll chock 41 holds the roll neck 13 so that it can rotate around the central axis 14 of the roll body 11. The lower roll chock 42 holds the roll neck 23 so that it can rotate around the central axis 24 of the roll body 21.

[0030] The pressurizing devices 43 and 44 pressurize the object to be pressed. For example, pressurizing device 43 is positioned below the lower roll chock 42 (object to be pressed) and functions as an upward pressurizing device that pressurizes the lower roll chock 42 upward. The configuration of pressurizing device 43 will be described later. Pressurizing device 44 is positioned above the upper roll chock 41 (object to be pressed) and functions as a downward pressurizing device that pressurizes the upper roll chock 41 downward. Pressurizing device 44 is, for example, a ball screw type linear actuator, and by rotating the ball screw, it moves the pressurizing rod 46 forward (downward) toward the upper roll chock 41, thereby pressurizing the upper roll chock 41 downward.

[0031] The housing 45 holds the upper roll chock 41, the lower roll chock 42, and the pressurizing devices 43 and 44.

[0032] [Pressurizing device] Next, the configuration of the pressurizing devices 33 and 43 will be specifically illustrated. As shown in Figure 3, the pressurizing devices 33 and 43 each include a cylinder 110, a piston 120, and a load-bearing body 130. The cylinder 110 pressurizes the lower roll chocks 32 and 42 (objects to be pressurized) upward by advancing (raising) the piston 120 toward the lower roll chocks 32 and 42.

[0033] The cylinder 110 comprises a cylinder body 111, a cap 112, a first bearing 113, and a second bearing 114. The cylinder body 111 has a bottom 115 located below the piston 120 and a peripheral wall 116 surrounding the piston 120 above the bottom 115. The cap 112 is positioned to close the upper end of the peripheral wall 116. The cap 112 has an opening 117 that allows the piston 120 to protrude toward the lower roll chocks 32 and 42.

[0034] The first bearing 113 guides the piston 120 in the forward and backward directions (e.g., vertical direction) relative to the lower roll chocks 32 and 42. The first bearing 113 surrounds the piston 120 around its axis in the forward and backward directions and closes the gap between the outer circumference of the piston 120 and the inner circumference of the peripheral wall 116. The second bearing 114 is located between the first bearing 113 and the lower roll chocks 32 and 42 and guides the piston 120 in the forward and backward directions (e.g., vertical direction) relative to the lower roll chocks 32 and 42. The second bearing 114 surrounds the piston 120 around its axis in the forward and backward directions and closes the gap between the outer circumference of the piston 120 and the inner circumference of the opening 117.

[0035] The piston 120 protrudes from the cylinder 110 toward the lower roll chocks 32 and 42, and moves forward or backward (e.g., up or down) relative to the lower roll chocks 32 and 42 by the driving pressure inside the cylinder 110. For example, the piston 120 protrudes upward from the cylinder 110 through the opening 117 of the cap 112.

[0036] In addition, forward movement means moving in the direction from which the object to be pressed is located, and backward movement means moving away from the object to be pressed. When the pressurizing devices 33 and 43 are located below the object to be pressed, upward movement corresponds to forward movement, and downward movement corresponds to backward movement.

[0037] The piston 120 has a flange 121 on its outer circumference. The flange 121 is in contact with the first bearing 113 and divides the inside of the circumferential wall 116 of the cylinder 110 into an upper space and a lower space. For example, when hydraulic fluid is pumped from the upper space to the lower space by a hydraulic pump (not shown), a driving pressure is generated inside the piston 120 that causes the piston 120 to rise. Conversely, when hydraulic fluid is pumped from the lower space to the upper space by a hydraulic pump, a driving pressure is generated inside the piston 120 that causes the piston 120 to fall.

[0038] The load-bearing body 130 is interposed between the piston 120 and the lower roll chocks 32 and 42. The piston 120 has a recess 122 that opens toward the lower roll chocks 32 and 42 and accommodates the load-bearing body 130. When the pressurizing devices 33 and 43 are located below the object to be pressurized, the recess 122 opens toward upward and has a bottom surface 123. The bottom surface 123 faces the lower roll chocks 32 and 42 via the load-bearing body 130. When the recess 122 opens toward upward, the bottom surface 123 faces upward.

[0039] The recess 122 is formed to allow the load-bearing body 130 to slide along the bottom surface 123. For example, the recess 122 is formed so that its inner diameter is larger than the outer diameter of the load-bearing body 130. This allows the load-bearing body 130 housed in the recess 122 to slide along the bottom surface 123. As an example, the bottom surface 123 is substantially flat, and the lower surface 131 of the load-bearing body 130 is also substantially flat. In this case, the load-bearing body 130 slides parallel to the bottom surface 123.

[0040] The bottom surface 123 may be located between the first bearing 113 and the second bearing 114 in the forward and backward direction (for example, vertical direction) of the piston 120. The bottom surface 123 does not necessarily have to be located between the first bearing 113 and the second bearing 114, as it only needs to be located at least further away from the lower roll chocks 32, 42 than the end face of the piston 120.

[0041] As described above, when the lower roll chocks 32 and 42 are located below the object to be pressurized, the piston 120 protrudes upward from the cylinder 110, and the recess 122 opens upward. In this case, the piston 120 may be configured to hold a lubricating fluid 125 (e.g., lubricating oil) in the recess 122.

[0042] The pressurizing devices 33 and 43 may further include a cover 170. The cover 170 seals the space between the inner circumference of the recess 122 and the outer circumference of the load-bearing body 130 at the end of the piston 120 (the end on the lower roll chock side 32 and 42), preventing the lubricating fluid 125 from evaporating or spilling. The cover 170 is made of a flexible material such as resin so that it can deform in accordance with the displacement of the load-bearing body 130 relative to the piston 120.

[0043] The load-bearing body 130 may have a first block 140 and a second block 150.

[0044] The first block 140 is in contact with the bottom surface 123. The second block 150 is interposed between the bottom surface 123 and the lower roll chocks 32 and 42.

[0045] The first block 140 has an opposing surface 141 that faces the lower roll chocks 32 and 42 via the second block 150, and is formed to allow the second block 150 to slide along the opposing surface 141.

[0046] The opposing surface 141 may be curved to tilt the second block 150 in response to the sliding of the second block 150. The opposing surface 141 may be curved to tilt the second block 150 about an axis parallel to the feed direction of the rolled material in response to the displacement of the second block 150 in a direction parallel to the lower rolling roll 20 (a direction parallel to the central axis 24). For example, the opposing surface 141 may be curved in a concave shape in a cross section perpendicular to the feed direction of the rolled material. The opposing surface 141 may be further curved to tilt the second block 150 about an axis parallel to the lower rolling roll 20 in response to the displacement of the second block 150 in a direction parallel to the feed direction of the rolled material. For example, the opposing surface 141 may be curved in a concave shape in a cross section perpendicular to the lower rolling roll 20 (across the central axis 24). As an example, the opposing surface 141 may be a concave surface on a sphere.

[0047] The opposing surface 141 may be located within the recess 122 of the piston 120. However, it is sufficient that at least a part of the first block 140 is located within the recess 122, so the opposing surface 141 does not necessarily have to be located within the recess 122.

[0048] The second block 150 has an opposing surface 151 that faces the opposing surface 141. The opposing surface 151 is curved to correspond to the curvature of the opposing surface 141. For example, the opposing surface 151 may be convex in a cross section perpendicular to the feed direction of the rolled material, or it may be convex in a cross section perpendicular to the lower rolling roll 20. As an example, the opposing surface 151 may be a spherical convex surface. In addition, the opposing surface 141 may be convex and the opposing surface 151 may be concave.

[0049] The first block 140 may have a peripheral wall 142 surrounding the second block 150. In this case, the peripheral wall 142 is formed to have an inner diameter larger than the outer diameter of the second block 150 so that the second block 150 can slide along the opposing surface 141. If the piston 120 holds its inner circumference 124 in the recess 122 and the opposing surface 141 is located in the recess 122, the first block 140 may further have a fluid-passing opening 148 that guides the inner circumference 124 into the peripheral wall 142.

[0050] The pressurizing devices 33 and 43 may further have a centering section 160. The centering section 160 holds the load-bearing body 130 at a position away from the inner circumference 124 of the recess 122 over its entire circumference when no force perpendicular to the forward or backward direction (e.g., vertical direction) of the piston 120 is acting on the load-bearing body 130.

[0051] For example, the centering portion 160 includes one or more elastic members 161 positioned between the load-bearing body 130 and the piston 120 so as the load-bearing body 130 approaches the inner circumference 124 of the recess 122. The one or more elastic members 161 may be positioned between the first block 140 and the piston 120 so as the first block 140 approaches the inner circumference 124 of the recess 122. For example, the one or more elastic members 161 are provided within the recess 122 between the outer circumference 144 and the inner circumference 124 of the first block 140.

[0052] The centering section 160 may include a plurality of elastic members 161 surrounding the load-bearing body 130. Figure 4 illustrates a case where the centering section 160 includes eight elastic members 161. The eight elastic members 161 are arranged at equal intervals along the outer circumference of the load-bearing body 130.

[0053] Returning to Figure 3, the multiple elastic members 161 may be positioned between the opening surface of the recess 122 and the bottom surface 123 of the recess 122, closer to the opening surface of the recess 122. In this case, the multiple elastic members 161 may be provided between the peripheral wall 142 and the inner circumference of the recess 122.

[0054] The load-bearing body 130 may have parts with different outer diameters. For example, the load-bearing body 130 may have a first part and a second part located between the first part and the bottom surface 123, with the outer circumference of the second part being located further out than the outer circumference of the first part. As an example, the first block 140 may have a first part 145 and a second part 146 located between the first part 145 and the bottom surface 123 on its outer circumference 144, with the outer circumference of the second part 146 being located further out than the outer circumference of the first part 145.

[0055] In the depth direction (e.g., vertical direction) of the recess 122, the width (height) of the second portion 146 may be smaller than the distance between the opposing surface 141 and the bottom surface 123, and the second portion 146 may be located closer to the bottom surface 123 between the opposing surface 141 and the bottom surface 123.

[0056] [Effects of this embodiment] As described above, the pressurizing devices 33 and 43 each include a cylinder 110, a piston 120 that protrudes from the cylinder 110 toward the object to be pressed and moves forward or backward relative to the object to be pressed by the driving pressure inside the cylinder 110, and a load-bearing body 130 interposed between the piston 120 and the object to be pressed. The piston 120 has a recess 122 that opens toward the object to be pressed and accommodates the load-bearing body 130. The recess 122 has a bottom surface 123 that faces the object to be pressed via the load-bearing body 130, and is formed to allow the load-bearing body 130 to slide along the bottom surface 123.

[0057] In pressurizing devices 33 and 43, a lateral load perpendicular to the forward or backward movement of the piston 120 may act on the pressurizing devices 33 and 43 from the object being pressed. When a lateral load acts on the pressurizing devices 33 and 43 from the object being pressed, an overturning moment is generated in the piston 120, making wear of the guide portion of the piston 120 more likely. In contrast, with this pressurizing device 33 and 43, the lateral load acting on the load-receiving body 130 from the object being pressed acts on the piston 120 at the bottom surface 123 of the recess 122. Therefore, compared to the case where a lateral load acts directly on the piston 120 from the object being pressed, the overturning moment acting on the piston 120 due to the lateral load is reduced. In addition, since the lateral load is weakened by the sliding of the load-receiving body 130 in response to the lateral load, it becomes less likely that an overturning moment caused by the lateral load will continuously act on the piston 120. Thus, it is effective in improving durability.

[0058] The cylinder 110 has a first bearing 113 that guides the piston 120, and a second bearing 114 located between the first bearing 113 and the object to be pressurized, which also guides the piston 120, and the bottom surface 123 may be located between the first bearing 113 and the second bearing 114. In this case, the lateral load is distributed between the first bearing 113 and the second bearing 114, so that wear of the first bearing 113 and the second bearing 114 is suppressed.

[0059] The object subjected to pressure may be the chock of the rolling roll. The effect of improving durability becomes more pronounced when applied to the rolling apparatus 1 which is subjected to a large load.

[0060] The load-bearing body 130 has a first block 140 that contacts the bottom surface 123 and a second block 150 interposed between the first block 140 and the object to be pressed. The first block 140 has a facing surface 141 that faces the object to be pressed via the second block 150, and is formed so that the second block 150 slides along the facing surface 141. The facing surface 141 may be curved so as to tilt the second block 150 in response to the sliding of the second block 150. An overturning moment on the piston 120 can also be generated by a pressing load acting in the forward or backward direction of the piston 120. For example, an overturning moment on the piston 120 can be generated if the pressing load is uneven in a plane perpendicular to the forward or backward direction. In contrast, the tilting of the second block 150 suppresses the overturning moment acting on the piston 120 due to the uneven pressing load. Therefore, it is even more effective in improving durability.

[0061] The object to be pressed is the chock of the rolling roll, and the opposing surface 141 may be curved such that it tilts the second block 150 about an axis parallel to the feeding direction of the rolled material 9, in accordance with the displacement of the second block 150 in a direction parallel to the rolling roll. In this case, the overturning moment acting on the piston 120 due to the deflection of the rolling roll is suppressed.

[0062] The opposing surface 141 may be further curved to tilt the second block 150 about an axis parallel to the rolling roll, in accordance with the displacement of the second block 150 in a direction parallel to the feeding direction of the rolled material 9. In this case, the overturning moment acting on the piston 120 due to the force acting from the rolled material 9 on the rolling roll is suppressed.

[0063] The opposing surface 141 may be located within the recess 122. In this case, the overturning moment acting on the piston 120 due to the lateral load acting on the opposing surface 141 is further suppressed.

[0064] The system may further include one or more elastic members 161 positioned between the first block 140 and the piston 120 so as the first block 140 approaches the inner circumference 124 of the recess 122. If the pressurizing devices 33 and 43 are installed with the first block 140 biased in one direction within the recess 122, the overturning moment acting on the piston 120 may not be sufficiently suppressed when a lateral load is applied in that direction. In contrast, the bias of the first block 140 within the recess 122 can be suppressed by one or more elastic members 161.

[0065] The opposing surface 141 is located within the recess 122, the first block 140 has a peripheral wall 142 surrounding the second block 150, and one or more elastic members 161 may be provided between the peripheral wall 142 and the inner circumference 124 of the recess 122. In this case, the elastic member 161 can be placed near the opening of the recess 122, thereby improving maintainability.

[0066] The cylinder 110 is positioned below the chock, and the piston 120 protrudes upward from the cylinder 110 and is configured to hold lubricating fluid 125 in a recess 122. The first block 140 may further have a fluid opening 148 that guides the lubricating fluid 125 into the peripheral wall 142. By retaining the lubricating fluid 125, the lubricity of both the bottom surface 123 and the opposing surface 141 of the recess 122 can be maintained at a high level, and the overturning moment acting on the piston 120 can be further suppressed.

[0067] The system may further include a centering portion 160 that holds the load-bearing body 130 away from the inner circumference 124 of the recess 122 over its entire circumference when no force perpendicular to the forward or backward movement of the piston 120 is acting on the load-bearing body 130. If the pressurizing devices 33 and 43 are installed with the first block 140 biased in one direction within the recess 122, it may not be possible to sufficiently suppress the overturning moment acting on the piston 120 when a lateral load is applied in that direction. In contrast, the centering portion 160 can suppress the bias of the first block 140 within the recess 122.

[0068] The centering section 160 may include one or more elastic members 161 positioned between the load-bearing body 130 and the piston 120 so as the load-bearing body 130 approaches the inner circumference 124 of the recess 122. By using one or more elastic members 161, the configuration of the centering section 160 can be simplified.

[0069] The load-bearing body 130 has a first portion 145 and a second portion 146 located between the first portion 145 and the bottom surface 123, and the outer circumference of the second portion 146 may be located outside the outer circumference of the first portion 145. In this case, the overturning moment acting on the piston 120 when the load-bearing body 130 collides with the inner circumference 124 of the recess 122 can be suppressed.

[0070] The cylinder 110 may be positioned beneath the object to be pressurized, and the piston 120 may protrude upward from the cylinder 110 and be configured to hold lubricating fluid 125 in the recess 122. By holding the lubricating fluid 125, the lubricity of the bottom surface 123 of the recess 122 can be maintained at a high level, and the overturning moment acting on the piston 120 can be further suppressed.

[0071] Although embodiments have been described above, this disclosure is not necessarily limited to the embodiments described above, and various modifications are possible without departing from the gist of the disclosure. For example, as shown in Figure 5, the pressurizing devices 33 and 43 may be used as depressurizing devices. Also, the pressurizing devices 34 and 44 may be used as depressurizing devices. Furthermore, the object to be pressurized by the pressurizing devices 33 and 43 is not necessarily limited to the chock of the rolling roll. The configuration of the pressurizing devices 33 and 43 is applicable to various applications that can receive a load in a direction perpendicular to the pressurizing direction. [Explanation of Symbols]

[0072] 1...Rolling mill, 110...Cylinder, 113...First bearing, 114...Second bearing, 120...Piston, 122...Recess, 123...Bottom surface, 124...Inner circumference, 125...Lubricating fluid, 130...Load bearing body, 140...First block, 141...Opposite surface, 142...Circumferential wall, 145...First part, 146...Second part, 148...Fluid passage opening, 150...Second block, 160...Centering part, 161...Elastic member, 33,43...Pressurizing device, 9...Rolled material.

Claims

1. Cylinder and A piston protrudes from the cylinder toward the object to be pressurized and moves in an advancing or reversing direction relative to the object to be pressurized by the driving pressure of the hydraulic fluid inside the cylinder, The system comprises a load-receiving body interposed between the piston and the object to be pressurized, The piston has an opening toward the object to be pressed and a recess for accommodating the load-bearing body, The recess has a bottom surface facing the object to be pressed via the load-bearing body, and is formed so as to allow the load-bearing body to slide along the bottom surface. The cylinder is A cylinder body that opens in the forward direction and houses the piston, A cap is positioned to close the forward end of the cylinder body and has an opening that causes the piston to protrude toward the object to be pressurized, A first bearing is provided between the inner circumference of the cylinder body and the outer circumference of the piston, A pressurizing device having a second bearing provided between the inner circumference of the opening of the cap and the outer circumference of the piston.

2. The piston has a flange on its outer circumference, The pressurizing device according to claim 1, wherein the flange is in contact with the first bearing and divides the inside of the cylinder body into a space on the forward direction side and a space on the reverse direction side.

3. The pressurizing device according to claim 1 or 2, wherein the object to be pressed is a chock of a rolling mill roll.

4. The load-bearing body comprises a first block in contact with the bottom surface and a second block interposed between the first block and the object to be pressed. The first block has a facing surface that faces the object to be pressed via the second block, and is formed so that the second block slides along the facing surface. The pressing device according to claim 1 or 2, wherein the opposing surface is curved to tilt the second block in response to the sliding of the second block.

5. The object to be pressed is the chock of a rolling roll, The pressing device according to claim 4, wherein the opposing surface is curved such that it inclins the second block about an axis parallel to the feeding direction of the rolled material, in accordance with the displacement of the second block in a direction parallel to the rolling roll.

6. The pressing device according to claim 5, wherein the opposing surface is further curved to tilt the second block about an axis parallel to the rolling roll in accordance with the displacement of the second block in a direction parallel to the feeding direction of the rolled material.

7. The pressurizing device according to any one of claims 4 to 6, wherein the opposing surface is located within the recess.

8. The pressurizing device according to any one of claims 5 to 6, further comprising one or more elastic members disposed between the first block and the piston such that the first block elastically deforms as it approaches the inner circumference of the recess.

9. The opposing surface is located within the recess, The pressurizing device according to claim 8, wherein the first block has a peripheral wall surrounding the second block, and the one or more elastic members are provided between the peripheral wall and the inner circumference of the recess.

10. The cylinder is positioned below the chock. The piston is configured to protrude upward from the cylinder and to hold lubricating fluid in the recess. The pressurizing device according to claim 9, wherein the first block further has a fluid passage opening that guides the lubricating liquid into the peripheral wall.

11. The pressurizing device according to any one of claims 1 to 7, further comprising a centering portion that holds the load-bearing body at a position away from the inner circumference of the recess over its entire circumference when no force perpendicular to the forward or backward direction is acting on the load-bearing body.

12. The pressurizing device according to claim 11, wherein the centering portion includes one or more elastic members disposed between the load-bearing body and the piston such that the load-bearing body elastically deforms as it approaches the inner circumference of the recess.

13. The pressurizing device according to any one of claims 1 to 12, wherein the load-bearing body has a first portion and a second portion located between the first portion and the bottom surface, and the outer circumference of the second portion is located outside the outer circumference of the first portion.

14. The cylinder is positioned below the object to be pressurized. The pressurizing device according to any one of claims 1 to 9, wherein the piston protrudes upward from the cylinder and is configured to hold lubricating fluid in the recess.

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