Four-roller straightener for strip material

Abstract

The utility model discloses a four -fold formula multirill straightener for plate strip straightening, including frame unit, roll changing device, screwdown device, track hoist and transmission, frame unit includes two frames, upper crossbeam and lower crossbeam, and screwdown device includes screwdown cylinder, balance device, swing frame, locking device and roll box, and the bottom of screwdown cylinder is connected with swing frame, and the upper and lower both ends of balance device are respectively connected with upper crossbeam, swing frame rotation, and roll box includes upper roll box and lower roll box, and locking device fixed mounting is in swing frame, and upper roll box is connected with swing frame through locking device, and the inlet side of upper roll box is connected with upper guide plate, and the inlet side of lower roll box is connected with lower guide plate, and track hoist includes track hoist cylinder and roll changing track, and track hoist cylinder is connected with frame, lower crossbeam, and roll changing track is connected with track hoist cylinder. The utility model discloses through to hot rolling, cold rolling plate strip and carries out rough straightening, reaches the purpose of eliminating plate strip wave shape, improves the purpose of the plate shape.

Description

Technical Field

[0001] This utility model relates to the technical field of strip and plate rolling straightening machines, specifically to a four-roller straightening machine for strip and plate straightening. Background Technology

[0002] In the production process of hot-rolled strip, the four-roll multi-roll straightener is a key strip straightening equipment. Its main function is to eliminate strip shape defects such as bending, wavy (such as edge waves, middle waves) or warping caused by rolling, cooling or coiling through alternating pressure from multiple rolls, so as to ensure that the flatness and dimensional accuracy of the strip meet the requirements of subsequent processing or end use.

[0003] However, traditional straightening machines do not pre-treat the strip (or steel strip) before it enters the straightening machine for straightening. This causes the strip to warp easily when it enters the straightening machine, and the upper roller box cannot always maintain a stable gravity balance. This results in poor stability, slow response speed, and high energy consumption of the hydraulic control of the pressing cylinder. It also makes it impossible to control the shape of the strip with high precision. At the same time, the straightening machine's work roller drive uses a large motor and a huge split gearbox to drive all the work rollers. The probability of gearbox tooth breakage accidents is high, which will generate negative torque in actual straightening production, thus affecting the rough straightening effect of hot-rolled and cold-rolled strip. Utility Model Content

[0004] The present invention aims to provide a four-roller straightener for straightening sheet and strip materials, so as to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is: a four-roller straightener for straightening sheet and strip materials, comprising: The rack unit includes two racks arranged side by side, with an upper crossbeam and a lower crossbeam connecting the two racks. The roller changing device is connected to one side of the frame unit; The pressing device includes a pressing cylinder, a balancing device, a swing frame, a locking device, and a roller box installed on the frame unit. The swing frame is mounted on the frame and swings up and down. The bottom of the pressing cylinder is connected to the swing frame. The upper and lower ends of the balancing device are rotatably connected to the upper crossbeam and the swing frame, respectively. The roller box includes an upper roller box and a lower roller box arranged vertically. Both the upper roller box and the lower roller box are equipped with support rollers, work rollers, and rolling mill bearings. The locking device is fixedly installed on the swing frame. The upper roller box is connected to the swing frame through the locking device. An upper guide plate is connected to the inlet side of the upper roller box, and a lower guide plate is connected to the inlet side of the lower roller box. The upper guide plate and the lower guide plate are arranged opposite each other. The track lifting device includes a track lifting cylinder and a roller changing track. The track lifting cylinder is connected to the frame and the lower crossbeam, and the roller changing track is connected to the track lifting cylinder. The transmission device includes a drive main motor, a universal coupling, a shaft connecting bracket, and a main motor support frame. The drive main motor is connected to the main motor support frame. One end of the universal coupling is connected to the drive main motor, and the other end is connected to the working roller of the upper or lower roller box. The shaft connecting bracket is connected to the roller changing track.

[0006] Preferably, the roller changing device includes a chain, a roller changing drive motor, a roller changing trolley, a sprocket support, and a roller changing frame; The roller changing drive motor is bolted to the roller changing car frame and its position can be adjusted by bolts on both sides; The roller changing trolley moves the roller box along the roller changing frame via wheels on both sides. The sprocket bracket is fixed to the roller changing car frame with bolts; The roller changing drive motor drives the roller changing trolley via a chain; The roll changing carriage is used to support all the components inside the roll changing device.

[0007] Preferably, the pressing cylinder includes a cylinder body, a displacement sensor, a tie rod, a spherical pad, a flange, a piston rod, and a pressure ring; The displacement sensor is connected to the pull rod; One end of the tie rod is fixed to the displacement sensor, and the other end is connected to the cylinder block; The spherical pad is divided into upper and lower parts, and the spherical pad is connected to the piston rod; The piston rod is connected to the spherical pad, and the piston rod and the cylinder body are fitted with a shaft hole. The pressure ring and the piston rod are spherically fitted, and the pressure ring is connected to the swing frame; The flange is divided into upper and lower parts, which are respectively connected to the oil inlet and outlet ports of the cylinder body.

[0008] Preferably, the balancing device includes a balancing cylinder and a pin. The upper and lower ends of the balancing cylinder are respectively provided with lifting lugs. The lifting lug at the upper end of the balancing cylinder is rotatably connected to the upper crossbeam of the frame through the pin, and the lifting lug at the lower end of the balancing cylinder is rotatably connected to the swing frame through the pin.

[0009] Preferably, the locking device includes a locking cylinder, a return spring, a push rod, a locking support, and a locking hook; The locking support is fixedly installed on the swing frame; The locking cylinder is connected to the swing frame via a locking support; The return spring is nested between the locking support and the push rod; The push rod and the locking support are fitted with a shaft hole, and the upper and lower ends of the push rod are connected to the locking cylinder and the locking hook, respectively.

[0010] Preferably, the number of main drive motors is equal to the number of work rollers, each main drive motor corresponds one-to-one with a work roller, and each main drive motor is connected to the work roller via a universal coupling.

[0011] This utility model has the following beneficial effects: (1) This utility model effectively prevents the strip material from warping when it enters the straightening machine for straightening by the cooperation of the upper and lower guide plates. During straightening, the strip material's shape can be adjusted simultaneously through the internal structure of the pressing cylinders on both sides and the balancing device, thereby achieving coarse straightening of the strip material and eliminating waviness and improving its shape. Specifically, the main motor drives multiple working rollers of the upper and lower roller boxes to roll the strip material, and the hydraulic system precisely controls the straightening pressure and roller posture to eliminate shape defects. At the same time, a highly integrated and fast roller changing device is provided to ensure production continuity and maintenance convenience. Through the connection and cooperation between the pressing cylinder, balancing device, swing frame, locking device and roller box, the locking device can ensure that the roller box and swing frame are tightly fitted during straightening, ensuring that there will be no loosening or displacement between the roller box and swing frame under the huge straightening impact force, thus ensuring straightening accuracy and stability. Among them, the balancing device and the pressing cylinder work together. The balancing device always provides an upward force during the straightening process to accurately balance the gravity of moving parts such as the swing frame and the upper roller box. This allows the pressing cylinder to output only the net pressure used for straightening, making the load and control of the pressing cylinder more stable and precise, improving the stability and response speed of hydraulic control, and reducing energy consumption.

[0012] (2) The transmission device adopts single roller transmission, which can avoid negative torque between working rollers, effectively reducing the probability of tooth breakage accidents in traditional gearboxes, lower equipment maintenance costs, and more reliable operation. Attached Figure Description

[0013] Figure 1 This is a front view of a four-roller straightener according to an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of the balance cylinder in an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the locking device according to an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the assembly of the pressing cylinder in an embodiment of the present invention.

[0017] Figure 5 This is a left view of a four-roller straightener according to an embodiment of the present invention.

[0018] The reference numerals in the attached figures are as follows: 1. Chain, 2. Roller changing drive motor, 3. Roller changing trolley, 4. Sprocket bracket, 5. Roller changing frame, 6. Swing frame, 7. Frame, 8. Upper crossbeam, 9. Balancing device, 10. Locking device, 11. Roller box, 12. Universal coupling, 13. Main motor support frame, 14. Drive main motor, 15. Shaft support, 16. Roller changing track, 17. Track lifting cylinder, 18. Lower crossbeam, 19. Pin shaft, 20. Balancing cylinder, 21. Locking cylinder, 22. Return spring, 23. Top rod, 24. Locking support, 25. Locking hook, 26. Displacement sensor, 27. Pull rod, 28. Spherical pad, 29. Flange, 30. Piston rod, 31. Pressure ring, 32. Upper guide plate, 33. Lower guide plate. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] See Figure 1-5 As shown, as an embodiment of this utility model, a four-roll multi-roll straightener for straightening strip and sheet materials is provided. This four-roll multi-roll straightener is used for straightening strip and sheet materials in hot rolling and cold rolling production lines, and includes: The frame unit, which serves as the main frame for bearing and supporting the straightening force, includes two frames 7 arranged side by side, with an upper crossbeam 8 and a lower crossbeam 18 connecting the two frames 7. The two frames 7 are fixed to the civil engineering foundation by anchor bolts. The roller changing device is fixed on the civil engineering foundation and connected to one side of the frame unit; The pressing device includes a pressing cylinder, a balancing device 9, a swing frame 6, a locking device 10, and a roller box 11 mounted on the frame unit. The swing frame 6 is mounted on the frame and swings up and down. The bottom of the pressing cylinder is connected to the swing frame 6. The upper and lower ends of the balancing device 9 are rotatably connected to the upper crossbeam and the swing frame 6, respectively. The roller box 11 includes an upper roller box and a lower roller box arranged vertically. Both the upper and lower roller boxes are equipped with support rollers, work rollers, and rolling mill bearings. The locking device 10 is fixedly mounted on the swing frame. The upper roller box is connected to the swing frame through the locking device 10 and is used to lock the roller box. An upper guide plate 32 is connected to the inlet side of the upper roller box, and a lower guide plate 33 is connected to the inlet side of the lower roller box. The upper guide plate 32 and the lower guide plate 33 are arranged vertically opposite each other. During the pressing and straightening of the strip, the balancing device balances the weight of the swing frame and the roller box. The pressing cylinder, the swing frame, and the roller box work together to straighten the strip. The track lifting device includes a track lifting cylinder 17 and a roller changing track 16. The track lifting cylinder 17 is connected to the frame 7 and the lower crossbeam 18, and the roller changing track 16 is connected to the track lifting cylinder 17. The transmission device includes a main drive motor 14, a universal coupling 12, a shaft connecting bracket 15, and a main motor support frame 13. The main motor support frame 13 is fixed on the civil engineering foundation. The main drive motor 14 is connected to the main motor support frame 13. One end of the universal coupling 12 is connected to the main drive motor 14, and the other end is connected to the working roll of the upper or lower roller box. The shaft connecting bracket 15 is connected to the roll changing track 16. The track lifting cylinder 17 is used to lift the roll changing track 16 to a certain height to hold the roller box for roll changing. At the same time, it lifts the shaft connecting bracket 15 to catch the universal coupling 12 during roll changing. The main drive motor 14 is supported on the main motor support frame 13. The main drive motor 14 is connected to the universal coupling 12 to drive the roll to rotate. The number of drive motors 14 is equal to the number of work rolls in the straightener, with each drive motor 14 corresponding one-to-one with a work roll. Each drive motor 14 is connected to a work roll via a universal coupling 12. This configuration fundamentally eliminates the negative torque generated between the work rolls due to speed differences, reducing additional energy loss and roll surface wear. The single-roller transmission avoids negative torque between the work rolls, effectively reducing the probability of gear breakage accidents in traditional gearboxes, resulting in lower equipment maintenance costs and more reliable operation.

[0023] This utility model discloses a four-roll multi-roll straightener for strip and sheet material straightening. The upper guide plate 32 and lower guide plate 33 work together to effectively prevent warping of the strip and sheet material during straightening. During straightening, the internal structure of the pressing cylinders on both sides and the balancing device 9 simultaneously adjusts the shape of the strip and sheet material, achieving coarse straightening and eliminating waviness, thus improving the shape. Specifically, the main motor 14 drives multiple working rollers in the upper and lower roller boxes to roll the strip and sheet material. A hydraulic system precisely controls the straightening pressure and roller posture to eliminate shape defects. A highly integrated, rapid roller changing device is also included to ensure continuous production and convenient maintenance. Furthermore, through the connection and cooperation between the pressing cylinder, balancing device 9, swing frame 6, locking device 10, and roller box 11, the locking device 10 ensures that the roller box and swing frame 6 are tightly fitted during straightening. This prevents loosening or displacement between the roller box and swing frame 6 under the enormous straightening impact force, thus guaranteeing straightening accuracy and stability. The balancing device 9 works in conjunction with the pressing cylinder, consistently providing an upward force during straightening to precisely balance the weight of moving components such as the swing frame 6 and upper roller box. This allows the pressing cylinder to output only the net pressure needed for straightening, making its load and control more stable and precise. This improves the stability and response speed of hydraulic control and reduces energy consumption.

[0024] This utility model's four-roll multi-roll straightener for sheet and strip straightening is widely used in processes such as hot-rolled pickling, galvanizing lines, and continuous annealing units, and is a core component in ensuring the surface quality of high-value-added products such as automotive and appliance sheets. In summary, the core advantages of this utility model include: 1. High-efficiency straightening capability; 2. Precise dynamic adjustment; 3. Optimized structure for greater stability and reliability; and 4. Integrated intelligent control.

[0025] In this embodiment, the roller changing device includes a chain 1, a roller changing drive motor 2, a roller changing trolley 3, a sprocket bracket 4, and a roller changing frame 5. The roller changing drive motor 2 is bolted to the roller changing frame 5 and can be adjusted in position by bolts on both sides. The roller changing trolley 3 drags the roller box 11 on the roller changing frame 5 via wheels on both sides. The sprocket bracket 4 is fixed to the roller changing frame 5 by bolts. The roller changing drive motor 2 drives the roller changing trolley 3 via the chain 1. The roller changing frame 5 is fixed to the civil engineering foundation and is used to support all components inside the roller changing device.

[0026] Among them, the roller changing drive motor 2 drives the first active sprocket below through the chain 1. The active sprocket rotates and drives the drive sprocket to rotate through the shaft connection. The drive sprocket drives the roller changing trolley 3 to move linearly on the roller changing frame 5 through the chain 1. The roller changing hook on the roller changing trolley 3 hooks the corresponding hook ring on the lower roller box and pulls out the roller box 11.

[0027] See Figure 4 As shown, in this embodiment, the pressing cylinder includes a cylinder body, a displacement sensor 26, a pull rod 27, a spherical pad 28, a flange 29, a piston rod 30, and a pressure ring 31. One end of the displacement sensor 26 is fixed to the civil engineering foundation, and the other end is connected to the pull rod 27. One end of the pull rod 27 is fixed to the displacement sensor 26, and the other end is connected to the cylinder body. The spherical pad 28 is divided into upper and lower parts, and the spherical pad 28 is connected to the piston rod 30. The piston rod 30 is connected to the spherical pad 28, and the piston rod 30 and the cylinder body are fitted with a shaft hole. The pressure ring 31 is fitted with the piston rod 30 with a spherical surface, and the pressure ring 31 is connected to the swing frame 6. The flange 29 is divided into upper and lower parts and is respectively connected to the oil inlet and outlet of the cylinder body.

[0028] In this embodiment, when the pressing cylinder is pressed down for straightening, the spherical pads 28 at both ends of the piston rod 30 achieve the tilting and straightening of the swing frame 6, and the pressure ring 31 presses the piston rod 30 tightly onto the swing frame 6. The movement of the cylinder drives the connecting rod 27 connected to it, and the displacement sensor 26 can measure the displacement of the connecting rod 27 to achieve precise control.

[0029] See Figure 2 As shown, in this embodiment, the balancing device 9 includes a balancing cylinder 20 and a pin 19. The upper and lower ends of the balancing cylinder 20 are respectively provided with lifting lugs. The lifting lug at the upper end of the balancing cylinder 20 is rotatably connected to the upper crossbeam 8 of the frame 7 through the pin 19. The lifting lug at the lower end of the balancing cylinder 20 is rotatably connected to the swing frame 6 through the pin 19. When the pressing cylinder presses down for straightening, the hydraulic servo control system enables the balancing cylinder 20 to maintain a stable balance with the weight of the swing frame 6 and the upper roller box at all times. The balancing cylinder 20 can accurately balance the gravity of the moving parts such as the swing frame 6 and the upper roller box, so that the pressing cylinder only needs to output the net pressure for straightening, which improves the stability and response speed of the hydraulic control and reduces energy consumption.

[0030] See Figure 3 As shown, in this embodiment, the locking device 10 includes a locking cylinder 21, a return spring 22, a push rod 23, a locking support 24, and a locking hook 25; the locking support 24 is fixedly installed on the swing frame 6; the locking cylinder 21 is connected to the swing frame 6 through the locking support 24; the return spring 22 is nested between the locking support 24 and the push rod 23; the push rod 23 and the locking support 24 are fitted with a shaft hole, and the upper and lower ends of the push rod 23 are respectively connected to the locking cylinder 21 and the locking hook 25.

[0031] When the locking cylinder 21 locks, the hydraulic pressure disappears, and the return spring 22 presses against the push rod 23, causing the locking hook 25, which is tightly connected to the push rod 23, to firmly adhere to the upper roller box. When the hydraulic pressure begins to act, it pushes the push rod 23 and the locking hook 25 downwards, releasing the locking of the roller box 11. When the straightener presses down for straightening, the roller box 11 locks with the swing frame 6. When changing rollers, the locking hook 25 slowly descends, the upper roller box slowly falls onto the lower roller box, and then the locking hook 25 continues to move downwards to the designated position and stops. The roller changing trolley 3 then begins to pull out the upper and lower roller boxes. This locking device 10 adopts a safety mode of "return spring 22 locking, hydraulic pressure releasing". In the absence of hydraulic pressure, the locking hook 25 automatically locks the roller box by the force of the return spring 22. Even in the event of a sudden power outage or hydraulic system failure, the locking device can always maintain the locked state, preventing the upper roller box from falling under gravity, ensuring the safety of equipment and personnel, and making it safer and more reliable.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A four-roller straightener for straightening sheet and strip materials, characterized in that: include: The rack unit includes two racks arranged side by side, with an upper crossbeam and a lower crossbeam connecting the two racks. The roller changing device is connected to one side of the frame unit; The pressing device includes a pressing cylinder, a balancing device, a swing frame, a locking device, and a roller box installed on the frame unit. The swing frame is mounted on the frame and swings up and down. The bottom of the pressing cylinder is connected to the swing frame. The upper and lower ends of the balancing device are rotatably connected to the upper crossbeam and the swing frame, respectively. The roller box includes an upper roller box and a lower roller box arranged vertically. Both the upper roller box and the lower roller box are equipped with support rollers, work rollers, and rolling mill bearings. The locking device is fixedly installed on the swing frame. The upper roller box is connected to the swing frame through the locking device. An upper guide plate is connected to the inlet side of the upper roller box, and a lower guide plate is connected to the inlet side of the lower roller box. The upper guide plate and the lower guide plate are arranged opposite each other. The track lifting device includes a track lifting cylinder and a roller changing track. The track lifting cylinder is connected to the frame and the lower crossbeam, and the roller changing track is connected to the track lifting cylinder. The transmission device includes a drive main motor, a universal coupling, a shaft connecting bracket, and a main motor support frame. The drive main motor is connected to the main motor support frame. One end of the universal coupling is connected to the drive main motor, and the other end is connected to the working roller of the upper or lower roller box. The shaft connecting bracket is connected to the roller changing track.

2. The four-roller straightener for strip and sheet straightening according to claim 1, characterized in that: The roller changing device includes a chain, a roller changing drive motor, a roller changing trolley, a sprocket support, and a roller changing frame; The roller changing drive motor is bolted to the roller changing car frame and its position can be adjusted by bolts on both sides; The roller changing trolley moves the roller box along the roller changing frame via wheels on both sides. The sprocket bracket is fixed to the roller changing car frame with bolts; The roller changing drive motor drives the roller changing trolley via a chain; The roll changing carriage is used to support all the components inside the roll changing device.

3. The four-roller straightener for strip and sheet straightening according to claim 1, characterized in that: The pressing cylinder includes a cylinder body, a displacement sensor, a tie rod, a spherical pad, a flange, a piston rod, and a pressure ring; The displacement sensor is connected to the pull rod; One end of the tie rod is fixed to the displacement sensor, and the other end is connected to the cylinder block; The spherical pad is divided into upper and lower parts, and the spherical pad is connected to the piston rod; The piston rod is connected to the spherical pad, and the piston rod and the cylinder body are fitted with a shaft hole; The pressure ring and the piston rod are spherically fitted, and the pressure ring is connected to the swing frame; The flange is divided into upper and lower parts, which are respectively connected to the oil inlet and outlet ports of the cylinder body.

4. The four-roller straightener for strip and sheet straightening according to claim 1, characterized in that: The balancing device includes a balancing cylinder and a pin. The upper and lower ends of the balancing cylinder are respectively provided with lifting lugs. The upper lifting lug of the balancing cylinder is rotatably connected to the upper crossbeam of the frame through the pin, and the lower lifting lug of the balancing cylinder is rotatably connected to the swing frame through the pin.

5. The four-roller straightener for strip and sheet straightening according to claim 1, characterized in that: The locking device includes a locking cylinder, a return spring, a push rod, a locking support, and a locking hook; The locking support is fixedly installed on the swing frame; The locking cylinder is connected to the swing frame via a locking support; The return spring is nested between the locking support and the push rod; The push rod and the locking support are fitted with a shaft hole, and the upper and lower ends of the push rod are connected to the locking cylinder and the locking hook, respectively.

6. The four-roller straightener for strip and sheet straightening according to claim 1, characterized in that: The number of drive motors is equal to the number of work rollers, with each drive motor corresponding to a work roller one-to-one, and each drive motor is connected to the work roller via a universal coupling.

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