Locking device for a rolling mill roll and rolling mill

Abstract

The utility model relates to rolling mill equipment technical field discloses a locking device and rolling mill of rolling mill roll, and this locking device includes hydraulic cylinder and mechanical locking structure, and hydraulic cylinder includes cylinder body, piston and first piston rod, piston and second piston rod connected in proper order, and has first guide cavity, piston cavity and second guide cavity in the cylinder body, and first piston rod, piston and second piston rod respectively with first guide cavity, piston cavity and second guide cavity seal fit, and first piston rod, piston and second piston rod have hollow structure through along the extension direction of the axis line of piston, and mechanical locking structure includes locking lever, locking block and locking nut, and locking lever passes through hollow structure, and one end of locking lever is equipped with the nut, and the end part of other end is equipped with the external thread, and locking block is sleeved in the outer periphery of locking lever, and locking nut and locking lever thread cooperation, this locking device locking mode is simple, and the maintenance is convenient, and has mechanical and hydraulic double locking, and the reliability is strong.

Description

Technical Field

[0001] This utility model relates to the field of rolling mill equipment technology, and in particular to a locking device for rolling mill rolls and a rolling mill. Background Technology

[0002] Roll locking devices in rolling mills operate in complex environments, facing challenges from water, dust, and oil. These environments place extremely high demands on the stability of the equipment. Failure of the locking device can lead to equipment damage, production interruptions, and even safety accidents. Currently, most existing rolling mill roll locking methods are either single hydraulic cylinder locking or single mechanical locking. Hydraulic cylinder locking typically uses a hydraulic cylinder to drive a locking ring, achieving rapid axial clamping and release of the roll. Mechanical locking generally uses traditional mechanical structures such as bolts and wedge blocks. However, existing technologies suffer from several drawbacks. Hydraulic locking devices can be unstable, with hydraulic cylinders prone to oil leakage and failure, and cylinder replacement is difficult. Mechanical locking structures are difficult to disassemble, hindering rapid roll replacement. Furthermore, bolt-wedge locking devices can experience bolt loosening and wedge misalignment after prolonged operation.

[0003] Therefore, the current technology of rolling mills has problems such as the single locking method of rolls, unstable locking, and difficulty in maintenance, which urgently need to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a locking device for rolling mill rolls and a rolling mill. The locking device for rolling mill rolls has a simple structure, a simple and reliable locking method for the rolls, and is easy to maintain. It can realize the rapid pressing, locking and releasing of the rolls, and has both mechanical and hydraulic locking, which has high reliability and high locking accuracy.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A locking device for rolling mill rolls, comprising:

[0007] A hydraulic cylinder includes a cylinder body, a piston, a first piston rod, and a second piston rod. The first piston rod, the piston, and the second piston rod are coaxially arranged and connected end-to-end in sequence. The cylinder body has a first guide cavity, a piston cavity, and a second guide cavity that are coaxially arranged and connected in sequence. The piston is located in the piston cavity and is sealed to the piston cavity. The first piston rod is sealed to the first guide cavity, and the second piston rod is sealed to the second guide cavity. The first piston rod, the piston, and the second piston rod each have a hollow structure extending along the axis of the piston.

[0008] A mechanical locking structure includes a locking rod, a locking block, and a locking nut. The locking rod passes through the hollow structure and engages with it. The locking rod has a first end and a second end. The first end of the locking rod is provided with a nut located outside the free end of the first piston rod. The second end of the locking rod is provided with an external thread. The locking block has a through hole through which the second end of the locking rod passes. The locking block is located outside the free end of the second piston rod and is used to engage with a locking part on the bearing seat of the roll. The locking nut engages with the external thread of the second end of the locking rod and is located on the side of the locking block away from the second piston rod.

[0009] When using the above-mentioned locking device to lock the roll, control the piston of each hydraulic cylinder to move downward, causing the second piston rod to move downward and extend into the mounting hole. This also causes the locking rod to extend into the mounting hole. The locking block, along with the second end of the locking rod, passes through the mounting hole and engages with the corresponding engaging part on the bearing seat. Then, control the piston of the hydraulic cylinder to move upward, causing the second piston cylinder to press against the nut, thus lifting the bearing seat upward with the locking rod. It should be noted that adjusting the engagement length between the locking rods and engaging parts of the four locking devices ensures the roll remains balanced, and controlling the synchronous operation of the four hydraulic cylinders guarantees the stability of the locking operation. When the piston moves upward a certain distance, or the pressure of the hydraulic cylinder reaches a certain preset value, the top side of the bearing seat abuts against the corresponding part of the frame, pressing the bearing seat firmly onto the frame. The four locking devices then lock and fix the roll assembly to the frame. Furthermore, along the axial direction of the roll, there are two locking devices at each end of the roll. The roll and the bearing seats at both ends are clamped between the locking rods at both ends, achieving axial position locking of the roll.

[0010] The aforementioned locking device incorporates a mechanical locking structure within the hollow structure of the piston and piston rod, achieving double locking. In the event of an unexpected situation with the hydraulic cylinder (such as oil leakage), insufficient pressure, or failure, the piston may move downwards in the locked state, potentially causing the roll locking to loosen or fail. In such cases, adjusting the nut on the locking rod can move the locking block upwards, locking the bearing seat to the frame, ensuring stable and accurate roll locking. Conversely, when it's necessary to unlock the roll from the frame, the hydraulic cylinder can be quickly released to unlock the roll. Furthermore, the double locking mechanism, in addition to the hydraulic locking, includes a mechanical locking mechanism, allowing for small-range precision roll gap adjustments while the roll is locked (by adjusting the locking nut on the locking rod to fine-tune the position of the locking block). After unlocking, the hydraulic cylinder can quickly and easily adjust the position of the locking block over a wide range.

[0011] Therefore, the locking device for the rolling mill rolls described above has a simple structure, a simple and reliable locking method for the rolls, is easy to maintain, can quickly press, lock and release the rolls, and has both mechanical and hydraulic locking, which makes it highly reliable and has high locking accuracy.

[0012] Optionally, the outer contour structure of the cylinder body includes a cylindrical part and a square part, and the square part is connected to one end of the cylindrical part. The center line of the square part coincides with the axis of the cylindrical part, and the axis of the cylindrical part is coaxial with the axis of the piston chamber. The four corners of the square part are provided with first connecting holes.

[0013] Optionally, in the extension direction of the centerline of the piston cavity, the sum of the lengths of the piston and the first piston rod is greater than or equal to the sum of the lengths of the piston cavity and the first guide cavity, and the sum of the lengths of the piston and the second piston rod is greater than or equal to the sum of the lengths of the piston cavity and the second guide cavity.

[0014] Optionally, the diameter of the piston chamber is larger than the diameter of the first guide chamber, the diameter of the piston chamber is the same as the diameter of the second guide chamber, a guide sleeve is provided in the second guide chamber, the guide sleeve is sealed to the second guide chamber, and the second piston rod passes through the guide sleeve and is sealed to the guide sleeve.

[0015] Optionally, a first sealing element and a second sealing element are provided between the first guide cavity and the first piston rod, which are spaced apart along the extension direction of the axis of the first guide cavity;

[0016] A third and a fourth sealing element are provided between the guide sleeve and the second piston rod, spaced apart along the extension direction of the axis of the second guide cavity; a fifth sealing element is provided between the second guide cavity and the guide sleeve.

[0017] Optionally, the first seal includes a first step seal assembly, and the second seal includes a first U-shaped sealing ring; and / or,

[0018] The third sealing element includes a second step seal assembly, and the fourth sealing assembly includes a second U-shaped sealing ring.

[0019] Optionally, the locking device for the mill rolls further includes a pressure sensor for detecting the pressure inside the cylinder.

[0020] Optionally, the locking device for the rolling mill rolls further includes a control device, wherein the hydraulic cylinder is signal-connected to the control device, and the pressure sensor is signal-connected to the control device.

[0021] Optionally, the locking block has two opposing locking ends, both of which can engage with the locking portion on the bearing seat of the roll, and each locking end forms a locking plane on the side facing the nut; the end face of the locking end forms an arc-shaped convex surface.

[0022] Based on the same design concept, this solution also provides a rolling mill, including a roll assembly, a frame, and a locking device for any of the rolling mill rolls provided in the above technical solutions. One roll assembly is provided with four locking devices for the rolling mill rolls. The roll assembly includes a roll, with bearing seats at both ends, the roll being rotatably connected to the bearing seats, and two engaging portions on the bearing seats. The bottom side of the frame has a recessed space for accommodating the roll assembly, and the roll assembly is located within the recessed space. The rolling mill has mounting holes corresponding to each bearing housing on the side away from the recessed space. Each bearing housing has two mounting holes, and the two mounting holes corresponding to the same bearing housing are located on both sides of the axis of the roll. A locking device for the rolling mill roll is installed at each mounting hole. The engaging part on each bearing housing corresponds one-to-one with the locking device for the rolling mill roll. The locking rod of the locking device for the rolling mill roll extends into the mounting hole, and the locking block on the locking rod engages with the engaging part. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0024] Figure 1 A cross-sectional structural diagram of a hydraulic cylinder for a locking device provided in an embodiment of this utility model;

[0025] Figure 2 A bottom view of a hydraulic cylinder for a locking device provided in an embodiment of this utility model;

[0026] Figure 3 A cross-sectional structural schematic diagram of a locking device for rolling mill rolls provided in an embodiment of this utility model;

[0027] Figure 4 A top view of a locking block of a locking device provided in an embodiment of this utility model;

[0028] Figure 5 This is a partial structural schematic diagram of a rolling mill provided in an embodiment of the present utility model;

[0029] Figure 6 for Figure 5A top view of part of the structure of the rolling mill in the middle;

[0030] Figure 7 This is a schematic diagram of the structure of a rolling mill roll assembly provided in an embodiment of the present invention.

[0031] Icons: 1-Hydraulic cylinder; 2-Mechanical locking structure; 3-Frame; 4-Roll; 5-Bearing seat; 11-Cylinder body; 12-Piston; 13-First piston rod; 14-Second piston rod; 15-Hollow structure; 21-Locking rod; 22-Locking block; 23-Locking nut; 24-Nut; 51-Clamping part; 111-Piston chamber; 112-Guide sleeve; 113-Cylindrical part; 114-Square part; 511-Overlapping surface. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0033] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] refer to Figure 3 As shown, this utility model provides a locking device for rolling mill rolls. For ease of explanation, in this embodiment, the extension direction of the piston's axis of the hydraulic cylinder is taken as the vertical direction, and the plane perpendicular to the piston's axis is taken as the horizontal plane. Specifically, as... Figure 3 As shown, the locking device for the rolling mill rolls in this embodiment includes: a hydraulic cylinder 1 and a mechanical locking structure 2, wherein reference... Figure 1 and Figure 2As shown, the hydraulic cylinder 1 includes a cylinder body 11, a piston 12, a first piston rod 13, and a second piston rod 14. The first piston rod 13, the piston, and the second piston rod 14 are coaxially arranged and connected end to end in sequence. The cylinder body 11 has a first guide cavity, a piston cavity 111, and a second guide cavity that are coaxially arranged and connected in sequence. The piston 12 is located in the piston cavity 111 and is sealed to the piston cavity 111, and the piston 12 is slidably connected to the piston cavity 111. The first piston rod 13 is sealed to the first guide cavity and is slidably connected to the first guide cavity. The second piston rod 14 is sealed to the second guide cavity and is slidably connected to the second guide cavity. Both the first piston rod 13 and the second piston rod 14 can extend out of the cylinder body 11 and move up and down, thus enabling the operation of this embodiment. Hydraulic cylinder 1 forms a double-rod hydraulic cylinder; the first piston rod 13, the piston, and the second piston rod 14 have a hollow structure 15 extending along the axis of the piston 12. Specifically, the hollow structure 15 is a cylindrical hollow structure 15, and the axis of the hollow structure 15 coincides with the axis of the piston 12. It should be noted that, under the premise of ensuring the structural strength of the first piston rod 13, the piston 12, and the second piston rod 14, the hollow structure 15 is set to penetrate the center of the first piston rod 13, the piston 12, and the second piston rod 14, so that the overall structure of the first piston rod 13, the piston 12, and the second piston rod 14 forms a hollow shape. The structural strength of the hollow first piston rod 13, the piston 12, and the second piston rod 14 meets the working requirements.

[0035] Combination Figure 1 like Figure 3 As shown, the mechanical locking structure 2 includes a locking rod 21, a locking block 22, and a locking nut 23. The locking rod 21 passes through the hollow structure 15 and engages with it. For example, the locking rod 21 can be clearance-fitted with the hollow structure 15. The locking rod 21 has a first end and a second end. The first end of the locking rod 21 is provided with a nut 24, which is located outside the free end of the first piston rod 13. The outer edge diameter of the nut 24 is larger than the diameter of the second guide cavity. The nut 24 can overlap with the end face of the free end of the second guide cavity, so that the nut 24 can be locked in the second guide cavity. On the free end side of the cavity, the second end of the locking rod 21 is provided with an external thread. The locking block 22 is sleeved on the outer periphery of the locking rod 21. The locking block 22 has a through hole through which the second end of the locking rod 21 passes. The locking rod 21 and the through hole are in clearance fit. The locking block 22 is located outside the free end of the second piston rod 14. The locking block 22 is used to engage with the engaging part 51 on the bearing seat 5 of the roll 4. The locking nut 23 is engaged with the external thread of the second end of the locking rod 21, and the locking nut 23 is located on the side of the locking block 22 away from the second piston rod 14.

[0036] The aforementioned locking device for rolling mill rolls is used for locking the rolling mill rolls. In this embodiment, the rolling mill can be a three-roll mill, such as an Assel three-roll mill, or a similar three-roll mill. (Reference) Figure 5 , Figure 6 and Figure 7 As shown, the rolling mill includes a frame 3 and a roll assembly. The roll assembly includes a roll 4 and bearing seats 5 for supporting the roll 4. Each end of the roll 4 has a bearing seat 5, and the ends of the roll 4 are mounted on and rotatably connected to the bearing seats 5, allowing the roll 4 to rotate around its own axis. The bottom side of the frame 3 has an upwardly recessed space, within which the roll assembly can be accommodated. Mounting holes are provided on the top side of the frame 3 at locations corresponding to each bearing seat 5, with each bearing seat 5 having two mounting holes. The two mounting holes corresponding to the same bearing seat 5 are located on opposite sides of the axis of the roll 4. Each bearing seat 5 has two engaging parts 51 located on opposite sides of the axis of the roll 4, and these engaging parts are positioned opposite each other, each corresponding to one of the two mounting holes. A locking device is installed at each mounting hole on the top side of the frame 3, aligned with the mounting hole and fixed to the top side of the frame 3. For example,... Figure 5 and Figure 3 As shown, the cylinder body 11 is installed on the top side of the frame 3 and is fixedly connected to the frame 3. The first piston rod 13 faces upward and the second piston rod 14 faces downward. The second piston rod 14 can extend into the mounting hole. One end of the locking rod 21 with the locking block 22 passes through the mounting hole. The locking block 22 can engage with the engaging part 51 on the bearing seat 5. Thus, a roll assembly is provided with four locking devices, and each bearing seat 5 has two locking devices.

[0037] When it is necessary to lock the roll, the piston 12 of each hydraulic cylinder 1 is controlled to move downward, causing the second piston rod 14 to move downward and extend into the mounting hole. This also causes the locking rod 21 to extend into the mounting hole. The locking block 22, along with the second end of the locking rod 21, passes through the mounting hole and engages with the corresponding engaging part 51 on the bearing seat 5. Then, the piston of the hydraulic cylinder 1 is controlled to move upward, causing the second piston cylinder to press against the nut 24, thus suspending the bearing seat 5 upward with the locking rod 21. It should be noted that adjusting the engagement length between the locking rod 21 and the engaging part 51 of the four locking devices ensures the roll 4 remains balanced and that the operation of the four hydraulic cylinders 1 is synchronized, guaranteeing the stability of the locking operation. When the piston moves upward a certain distance, or the pressure of the hydraulic cylinder 1 reaches a certain preset value, the top side of the bearing seat 5 and the corresponding part of the frame 3 abut against each other, pressing the bearing seat 5 onto the frame 3. Then, the four locking devices lock and fix the roll assembly to the frame 3. In the axial direction of the roll 4, there are two locking devices at both ends of the roll 4. The roll 4 and the bearing seats 5 at both ends are clamped between the locking rods 21 at both ends, thereby locking the axial position of the roll 4.

[0038] The aforementioned locking device incorporates a mechanical locking structure within the hollow structure of the piston and piston rod, achieving double locking. In the event of an unexpected situation with the hydraulic cylinder (such as oil leakage), insufficient pressure, or failure, the piston may move downwards in the locked state, potentially causing the roll locking to loosen or fail. In such cases, adjusting the nut on the locking rod can move the locking block upwards, locking the bearing seat to the frame, ensuring stable and accurate roll locking. Conversely, when it's necessary to unlock the roll from the frame, the hydraulic cylinder can be quickly released to unlock the roll. Furthermore, the double locking mechanism, in addition to the hydraulic locking, includes a mechanical locking mechanism, allowing for small-range precision roll gap adjustments while the roll is locked (by adjusting the locking nut on the locking rod to fine-tune the position of the locking block). After unlocking, the hydraulic cylinder can quickly and easily adjust the position of the locking block over a wide range.

[0039] Therefore, the locking device for the rolling mill rolls described above has a simple structure, a simple and reliable locking method for the rolls, is easy to maintain, can quickly press, lock and release the rolls, and has both mechanical and hydraulic locking, which makes it highly reliable and has high locking accuracy.

[0040] In one possible implementation, refer to Figure 1 and Figure 2 As shown, the cylinder body 11 has an external outline structure consisting of a cylindrical portion 113 and a square portion 114. The square portion 114 is connected to one end of the cylindrical portion 113. The centerline of the square portion 114 coincides with the axis of the cylindrical portion 113. The axis of the cylindrical portion 113 is coaxial with the axis of the piston chamber 111. The cylindrical portion 113 is opposite to the second guide chamber, and the cylindrical portion 113 is opposite to the piston chamber 111 and the first guide chamber. The four corners of the square portion 114 are provided with first connecting holes. The axis of the first connecting holes is parallel to the centerline of the square portion 114. The first connecting holes are through holes. On the top side of the frame 3, around the mounting holes, there are four second connecting holes that correspond one-to-one with the connecting holes of the square portion 114. The second connecting holes are opposite to the first connecting holes. The second connecting holes can be blind holes or through holes. The cylinder body 11 is connected and fixed to the second connecting holes on the frame 3 by bolts passing through the first connecting holes. The square part 114 is directly used as a flange structure and fixedly connected to the frame 3, which is convenient, reliable and easy to install. It can be quickly installed and disassembled, and can be quickly replaced. The hydraulic cylinder 1 has a simple external structure, which is convenient to install and disassemble. The size of the cylinder body 11 can be set to be as small as possible, and the hydraulic cylinder 1 can be replaced online without removing the rotating part, which helps to reduce maintenance time and reduce maintenance costs.

[0041] Preferably, for the outer contour dimensions of the cylinder body, the outer diameter of the cylindrical part can be set to 180 mm, the square part is a square with a side length of 240 mm, and the total height of the square part and the cylindrical part is 160 mm along the extension direction of the axis of the cylindrical part, with the square part having a height of 40 mm.

[0042] For example, the inner wall of the first connecting hole is a smooth surface, and the second connecting hole is provided with an internal thread. The cylinder is connected and fixed by four bolts passing through the first connecting hole and threadedly engaging with the second connecting hole respectively. Preferably, the bolts can be M24 bolts, and the diameters of both the first and second connecting holes are adapted to the bolts, with a clearance fit between the first connecting hole and the bolt.

[0043] For the length settings of the first and second piston rods, refer to Figure 1 and Figure 3 As shown, in the extension direction of the axis of piston cavity 111, the total length of the piston and the first piston rod 13 is greater than or equal to the total length of piston cavity 111 and the first guide cavity, and the total length of the piston and the second piston rod 14 is greater than or equal to the total length of piston cavity 111 and the second guide cavity. Thus, when the piston is in piston cavity 111 and at its lowest point, the free end of the first piston rod 13 is flush with or higher than the outer end face of the first guide cavity. During the piston's up-and-down movement, the nut 24 at the first end of the locking rod 21 will always be located outside the cylinder body 11, preventing the nut 24 from entering the first guide cavity and avoiding contact with its inner wall. This helps protect the inner wall of the first guide cavity, ensures the sealing between the first piston rod 13 and the first guide cavity, protects the inner cavity of the cylinder body 11, and extends the service life of the hydraulic cylinder 1. Similarly, when the piston is at its highest position, the free end of the second piston rod 14 will be flush with or higher than the outer end face of the second guide cavity. During the piston's up-and-down movement, the locking block 22 at the second end of the locking rod 21 will always be located outside the cylinder body 11. The locking block 22 will not enter the second guide cavity, thus avoiding contact with the inner wall of the second guide cavity. This helps protect the inner wall of the second guide cavity, ensures the sealing between the second piston rod 14 and the second guide cavity, protects the inner cavity of the cylinder body 11, and extends the service life of the hydraulic cylinder 1.

[0044] Specifically, regarding the cavity design within the cylinder, such as... Figure 1As shown, the diameter of the piston chamber 111 can be set to be larger than the diameter of the first guide chamber, and the diameter of the piston chamber 111 can be the same as the diameter of the second guide chamber. A guide sleeve 112 is provided in the second guide chamber, and the guide sleeve 112 is sealed to the second guide chamber. The second piston rod 14 passes through the guide sleeve 112 and is sealed to the guide sleeve 112. Preferably, the inner diameter of the guide sleeve 112 can be set to be the same as the diameter of the first guide chamber, so that the diameters of the first piston rod 13 and the second piston rod 14 are the same, which is convenient for processing and manufacturing.

[0045] In a preferred implementation, two seals are provided between the first guide cavity and the first piston rod. Specifically, a first sealing element and a second sealing element are provided at intervals along the extension direction of the axis of the first guide cavity between the first guide cavity and the first piston rod. For example, the first sealing element can be a first step seal assembly, and the second sealing element can be a first U-shaped sealing ring. The dual-seal configuration helps extend the service life of the sealing elements, reduces the replacement frequency, effectively improves the sealing performance between the first guide cavity and the first piston rod, and improves the sealing performance of the hydraulic cylinder, reduces internal leakage, and ensures operational stability.

[0046] Similarly, two seals are also provided between the guide sleeve and the second piston rod. Specifically, a third and a fourth seal are provided between the guide sleeve and the second piston rod, spaced apart along the extension direction of the axis of the second guide cavity, and a fifth seal is provided between the second guide cavity and the guide sleeve. This improves the sealing performance between the guide sleeve and the second piston rod and reduces internal leakage. For example, the third seal can be a second step seal assembly, the fourth seal assembly can be a second U-shaped sealing ring, and the fifth seal can be a third U-shaped sealing ring or an O-ring. The dual-seal configuration helps extend the service life of the seals, reduces the replacement frequency, effectively improves the sealing performance between the second guide cavity and the second piston rod, improves the sealing performance of the hydraulic cylinder, reduces internal leakage, and ensures operational stability.

[0047] In one possible implementation, the locking device for the rolling mill rolls further includes a pressure sensor and a control device. The hydraulic cylinder is signal-connected to the control device, and the pressure sensor is also signal-connected to the control device. Furthermore, the pressure sensor and control device are wirelessly connected. The control device includes a wireless transmission module and a data acquisition module. The pressure sensor is used to detect the pressure inside the cylinder. As the control center, the control device allows the pressure sensor to monitor the hydraulic cylinder's oil pressure in real time and send the detected oil pressure signal to the control device for remote monitoring. This real-time monitoring of the hydraulic cylinder's operating status is beneficial for maintenance, extending its service life. The control device can also determine the hydraulic cylinder's condition based on its oil pressure, promptly detecting any failures and enabling intelligent monitoring. This allows staff to take timely countermeasures, preventing equipment damage and production interruptions. The control device may include an analysis module. This module can analyze and calculate based on the pressure sensor signal, predicting the hydraulic cylinder's condition and providing early warning. This enables predictive maintenance and full-process maintenance, ensuring the quality of the hydraulic cylinder during operation and improving operational safety.

[0048] For example, the pressure sensor's pressure testing connector is installed inside the oil pipe of the cylinder body. The piston divides the piston chamber into two chambers, which can be referred to as the first oil chamber and the second oil chamber, respectively. The first oil chamber is connected to the first guide chamber, and the second oil chamber is connected to the second guide chamber. The cylinder body has a first oil passage communicating with the first oil chamber and a second oil passage communicating with the second oil chamber. The opening of the first oil passage on the outside of the cylinder body forms a first oil inlet, and the opening of the second oil passage on the outside of the cylinder body forms a second oil inlet. The first oil inlet is connected to the first oil pipe, and the second oil inlet is connected to the second oil pipe. Preferably, the pressure testing connector can be installed inside either the first or second oil pipe, or it can be installed inside both the first and second oil pipes. A sealing gasket or a threaded connection is used at the connection between the pressure testing connector and the first or second oil pipe to prevent leakage.

[0049] When selecting a pressure sensor, choose an appropriate range based on the working pressure of the hydraulic cylinder. The sensor's detection range can be 20% to 30% greater than the hydraulic cylinder's working pressure, providing a margin of safety relative to the equipment's working pressure. Select a sensor with an accuracy within ±0.5%FS to ensure the accuracy of the monitoring data. Also, choose a pressure sensor with high temperature resistance, corrosion resistance, and vibration resistance to adapt to complex industrial environments and ensure a long service life.

[0050] Regarding the specific design of the mechanical locking structure, and the structural design of the locking block, combined with... Figure 3 ,like Figure 4 and Figure 7As shown, the locking block 22 has two opposing locking ends, both of which can engage with the locking portion 51 on the bearing seat 5 of the roll 4. Each locking end forms a locking plane on the side facing the nut 24, and the locking plane is perpendicular to the axis of the locking rod 21. The end face of the locking end forms an arc-shaped convex surface. The locking portion 51 on the bearing seat 5 is adapted to the locking end of the locking block 22. Specifically, the locking portion 51 of the bearing seat 5 can be a groove, which is located on the side wall of the bearing seat 5. The groove has a downward overlapping surface 511 and an arc-shaped concave surface. The arc-shaped concave surface is located on the side wall of the bearing seat 5 and is below and perpendicular to the overlapping surface 511. The overlapping surface 511 engages with the locking plane, and the arc-shaped concave surface engages with the arc-shaped convex surface of the locking block 22. Both ends of the locking block 22 are set as snap-fit ​​ends. When locking, either of the two snap-fit ​​ends can be used to engage with the slot. Both snap-fit ​​ends can engage with the slot. After one snap-fit ​​end wears out, the other snap-fit ​​end can be used directly by changing the direction, thus extending the service life of the locking block 22.

[0051] Based on the same design concept, and referencing Figure 3 and Figure 5 , Figure 6 ,and Figure 7 As shown, this embodiment also provides a rolling mill, which includes a roll assembly, a frame 3, and a locking device for any of the rolling mill rolls provided in the above embodiments. One roll assembly is provided with four locking devices for the rolling mill rolls. The roll assembly includes a roll 4, with bearing seats 5 at both ends of the roll 4. The roll 4 is rotatably connected to the bearing seats 5 and can rotate around its own axis. Each bearing seat 5 is provided with two engaging parts 51. The bottom side of the frame 3 has a recessed space for accommodating the roll assembly. The roll assembly is located in the recessed space, and the side of the rolling mill away from the recessed space is... Each bearing housing 5 is provided with a mounting hole corresponding to each bearing housing 5. Each bearing housing 5 has two mounting holes, and the two mounting holes corresponding to the same bearing housing 5 are located on both sides of the axis of the roll 4. The bearing housing 5 is provided with two engaging parts 51, which are respectively opposite to the two mounting holes. A locking device for the rolling mill roll is installed at each mounting hole. The engaging parts 51 on each bearing housing 5 correspond one-to-one with the locking devices for the rolling mill roll. The locking rod 21 of the locking device for the rolling mill roll extends into the mounting hole, and the locking block 22 on the locking rod 21 engages with the engaging part 51.

[0052] The aforementioned rolling mill employs a double-locking design for its locking device, which presses the bearing housing against the frame, thereby locking the rolls. The locking device has a simple overall structure, a simple and reliable method for locking the rolls, and is easy to maintain. It can achieve rapid pressing, locking, and unlocking of the rolls, and features both mechanical and hydraulic locking, resulting in high reliability and high locking accuracy. This makes the rolling mill highly adaptable, effectively dealing with various contaminants such as water, dust, and oil, and suitable for producing seamless steel pipes with thick walls, high precision, and high strength requirements.

[0053] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A locking device for rolling mill rolls, characterized in that, include: A hydraulic cylinder includes a cylinder body, a piston, a first piston rod, and a second piston rod. The first piston rod, the piston, and the second piston rod are coaxially arranged and connected end-to-end in sequence. The cylinder body has a first guide cavity, a piston cavity, and a second guide cavity that are coaxially arranged and connected in sequence. The piston is located in the piston cavity and is sealed to the piston cavity. The first piston rod is sealed to the first guide cavity, and the second piston rod is sealed to the second guide cavity. The first piston rod, the piston, and the second piston rod each have a hollow structure extending along the axis of the piston. A mechanical locking structure includes a locking rod, a locking block, and a locking nut. The locking rod passes through the hollow structure and engages with it. The locking rod has a first end and a second end. The first end of the locking rod is provided with a nut located outside the free end of the first piston rod. The second end of the locking rod is provided with an external thread. The locking block has a through hole through which the second end of the locking rod passes. The locking block is located outside the free end of the second piston rod and is used to engage with a locking part on the bearing seat of the roll. The locking nut engages with the external thread of the second end of the locking rod and is located on the side of the locking block away from the second piston rod.

2. The locking device for rolling mill rolls according to claim 1, characterized in that, The cylinder body's outer contour structure includes a cylindrical part and a square part, with one end of the square part connected to the cylindrical part. The center line of the square part coincides with the axis of the cylindrical part, and the axis of the cylindrical part is coaxial with the axis of the piston chamber. The four corners of the square part are provided with first connecting holes.

3. The locking device for rolling mill rolls according to claim 1, characterized in that, In the direction of extension of the centerline of the piston cavity, the sum of the lengths of the piston and the first piston rod is greater than or equal to the sum of the lengths of the piston cavity and the first guide cavity, and the sum of the lengths of the piston and the second piston rod is greater than or equal to the sum of the lengths of the piston cavity and the second guide cavity.

4. The locking device for rolling mill rolls according to claim 1, characterized in that, The diameter of the piston chamber is larger than the diameter of the first guide chamber, and the diameter of the piston chamber is the same as the diameter of the second guide chamber. A guide sleeve is provided inside the second guide chamber, and the guide sleeve is sealed to the second guide chamber. The second piston rod passes through the guide sleeve and is sealed to the guide sleeve.

5. The locking device for rolling mill rolls according to claim 4, characterized in that, A first sealing element and a second sealing element are provided between the first guide cavity and the first piston rod, which are spaced apart along the extension direction of the axis of the first guide cavity; A third and a fourth sealing element are provided between the guide sleeve and the second piston rod, spaced apart along the extension direction of the axis of the second guide cavity; a fifth sealing element is provided between the second guide cavity and the guide sleeve.

6. The locking device for rolling mill rolls according to claim 5, characterized in that, The first seal includes a first step seal assembly, and the second seal includes a first U-shaped sealing ring; and / or, The third sealing element includes a second step seal assembly, and the fourth sealing assembly includes a second U-shaped sealing ring.

7. The locking device for rolling mill rolls according to any one of claims 1-6, characterized in that, It also includes a pressure sensor for detecting pressure within the cylinder.

8. The locking device for rolling mill rolls according to claim 7, characterized in that, It also includes a control device, the hydraulic cylinder being signal-connected to the control device, and the pressure sensor being signal-connected to the control device.

9. The locking device for rolling mill rolls according to any one of claims 1-6, characterized in that, The locking block has two opposing locking ends, both of which can engage with the locking portion on the bearing seat of the roll. Each locking end forms a locking plane on the side facing the nut. The end face of the locking end forms an arc-shaped convex surface.

10. A rolling mill, characterized in that, The mill includes a roll assembly, a frame, and a locking device for the mill rolls as described in any one of claims 1-9. Each roll assembly has four locking devices for the mill rolls. Each roll assembly includes a roll with bearing seats at both ends, the roll being rotatably connected to the bearing seats, and the bearing seats having two engaging portions. The frame has a recessed space on its bottom side for accommodating the roll assembly, the roll assembly being located within the recessed space, and a mounting hole corresponding to each bearing seat on the side of the mill away from the recessed space. Each bearing seat has two mounting holes, and the two mounting holes corresponding to the same bearing seat are located on opposite sides of the roll's axis. Each mounting hole has one locking device for the mill roll. Each engaging portion on the bearing seat corresponds one-to-one with a locking device for the mill roll. The locking rod of the locking device extends into the mounting hole, and a locking block on the locking rod engages with the engaging portion.

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