Device and method for replacing screw-down hydraulic cylinder of rolling mill

Abstract

The invention provides a rolling mill screw-down hydraulic cylinder replacing device and method, and belongs to the technical field of mechanical equipment maintaining.The rolling mill screw-down hydraulic cylinder replacing device comprises a step-shaped bearing table connected with a crown block, and a balance weight module is arranged on the side, located on the step-shaped upper portion, of the bearing table; an electromagnetic placing seat for placing the hydraulic cylinder is arranged on one side of the step-shaped lower part of the bearing table, and the electromagnetic placing seat is connected with one side of the step-shaped lower part of the bearing table through a vertical adjusting mechanism and a horizontal adjusting mechanism. The hydraulic cylinder can be replaced while the upper supporting roller does not need to be completely pulled out, so that the replacement time of the hydraulic cylinder is shortened; meanwhile, external pollutant invasion caused by repeated disassembly and assembly of the oil pipe can be avoided, and therefore the service life of the servo valve is prevented from being shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical equipment maintenance, and in particular relates to a device and method for replacing a rolling mill press-down hydraulic cylinder. Background Art

[0002] In the metallurgical industry, the AGC (Automatic Gauge Control) hydraulic cylinders used to hold down four-high rolling mills are key components for ensuring accurate plate thickness. The efficiency and reliability of their replacement operations directly impact the continuity of the rolling mill's production line and product quality. Traditional hydraulic cylinder replacement techniques require the complete removal of the backup rolls. When replacing the drive side, both cylinders must be completely disassembled. Each replacement takes at least six hours and requires the coordinated operation of multiple overhead cranes, making process coordination difficult. Furthermore, the repeated disassembly and assembly of the oil pipes during the disassembly process introduces external contaminants (dust and metal debris), shortening the average lifespan of the servo valve from 8,000 hours to 4,500 hours. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the traditional hydraulic cylinder replacement technology is time-consuming and repeated disassembly and assembly affects the life of the servo valve.

[0004] The technical solution adopted by the device and method for replacing the pressing hydraulic cylinder of a rolling mill of the present invention is: A rolling mill hydraulic cylinder replacement device includes a stepped load-bearing platform connected to a crown crane, a counterweight module is provided on one side of the stepped upper portion of the load-bearing platform, and an electromagnetic placement seat for placing the hydraulic cylinder is provided on one side of the stepped lower portion of the load-bearing platform. The electromagnetic placement seat is connected to the side of the stepped lower portion of the load-bearing platform through a vertical adjustment mechanism and a horizontal adjustment mechanism.

[0005] A further improvement of the above technical solution of the present invention is that the total weight of the counterweight module is 1.2-1.5 times the weight of the hydraulic cylinder to be replaced.

[0006] A further improvement of the above technical solution of the present invention is that the counterweight module includes a plurality of counterweight blocks detachably connected to one side of the load-bearing platform located at the stepped upper portion thereof.

[0007] A further improvement of the above technical solution of the present invention is that: the load-bearing platform is provided with a plurality of slide grooves along the length direction of the load-bearing platform on one side of its stepped upper part, and the plurality of slide grooves are symmetrically arranged along the length axis of the load-bearing platform; at the same time, each counterweight block is connected to the corresponding slide groove through a slider adapted to the slide groove.

[0008] A further improvement of the above technical solution of the present invention is that: the horizontal adjustment mechanism is located at the stepped lower part of the load-bearing platform, the electromagnetic placement seat is located above the horizontal adjustment mechanism, and the electromagnetic placement seat and the horizontal adjustment mechanism are connected through the vertical adjustment mechanism.

[0009] A further improvement of the above technical solution of the present invention is that: the horizontal adjustment mechanism includes an adjustment groove opened on the stepped lower part of the load-bearing platform along the length direction of the load-bearing platform, and the adjustment groove is equipped with an adjustment block connected to the vertical adjustment mechanism; wherein, a screw rod penetrating the adjustment block is rotatably connected in the adjustment groove, and the screw rod is threadedly connected to the adjustment block penetrated.

[0010] A further improvement of the above technical solution of the present invention is that: the vertical adjustment mechanism includes multiple hydraulic rods vertically arranged on the top of the adjustment block, the top end of each hydraulic rod is fixedly connected to the top of the electromagnetic placement seat, and the bottom end of each hydraulic rod is fixedly connected to the top of the adjustment block.

[0011] A method for replacing a rolling mill hydraulic cylinder, using the above-mentioned rolling mill hydraulic cylinder replacement device, comprises the following steps: S1. Place an appropriate number of counterweights on the load-bearing platform and fix the hydraulic cylinder on the electromagnetic placement seat; S2. Lift the upper support roller upwards, remove the old hydraulic cylinder, and then move the load-bearing platform to place the new hydraulic cylinder in the appropriate position; S3. Fine-tune the position of the hydraulic cylinder on the load-bearing platform through the horizontal adjustment mechanism and the vertical adjustment mechanism; S4. Install the hydraulic cylinder on the load-bearing platform in place, then move the load-bearing platform to separate the electromagnetic placement seat and the hydraulic cylinder to complete the replacement of the hydraulic cylinder.

[0012] A further improvement of the above technical solution of the present invention is that: in step S3, the adjustment range of the horizontal adjustment mechanism is 0-500 mm, and the adjustment range of the vertical adjustment mechanism is 0-100 mm.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: The present invention can complete the replacement of the hydraulic cylinder without completely withdrawing the upper support roller, thereby shortening the replacement time of the hydraulic cylinder; and can also avoid the invasion of external pollutants caused by repeated disassembly and assembly of the oil pipe, thereby preventing the service life of the servo valve from being reduced.

[0014] The electromagnetic placement seat in the present invention can fix the hydraulic cylinder on the load-bearing platform, thereby avoiding the problem that bolt fixing may cause damage to the hydraulic cylinder; at the same time, the counterweight module provided in the present invention can keep the hydraulic cylinder and the counterweight module balanced when the hydraulic cylinder is placed on the electromagnetic placement seat, and prevent the weight imbalance on both sides of the load-bearing platform from shifting the center of gravity and tilting; the vertical adjustment mechanism and horizontal adjustment mechanism provided in the present invention can fine-tune the position of the hydraulic cylinder when the load-bearing platform drives the hydraulic cylinder to move to the bottom of the upper support roller, thereby adjusting the position of the hydraulic cylinder more accurately.

[0015] Since the counterweight module in the present invention is composed of multiple counterweight blocks, the weight of the counterweight module can be flexibly adjusted according to the weight of the hydraulic cylinder to be replaced, so that the present invention can be applied to the replacement of various types of hydraulic cylinders, thereby improving the applicability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 and Figure 2 Schematic diagrams of the structure of a rolling mill screw-down hydraulic cylinder replacement device provided by an embodiment of the present invention at different angles; Figure 3 The present invention provides a rolling mill hydraulic cylinder replacement device. Figure 1 A schematic diagram of the enlarged structure of the middle part A; Figure 4 The present invention provides a rolling mill hydraulic cylinder replacement device. Figure 3 Schematic diagram of the structure in which the electromagnetic placement seat and the vertical adjustment mechanism are separated.

[0017] In the attached figure: 1, load-bearing platform; 11, lifting lug; 2. Electromagnetic placement seat; 3. Horizontal adjustment mechanism; 31. Adjustment slot; 32. Adjustment block; 33. Screw; 4. Hydraulic rod; 5. Counterweight; 51. Slide. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] The invention provides a device and method for replacing a rolling mill screw-down hydraulic cylinder.

[0020] first Figures 1-4 It can be seen that a rolling mill press-down hydraulic cylinder replacement device in the present invention includes a load-bearing platform 1 arranged in a step-like shape. In this embodiment, the load-bearing platform 1 is lower on the left and higher on the right.

[0021] At the same time, the higher side of the load-bearing platform 1 in the present invention is detachably connected to a counterweight module, the total weight of which is 1.2-1.5 times the weight of the hydraulic cylinder to be replaced, thereby allowing the present invention to maintain a balanced state when lifted by an overhead crane. The above-mentioned counterweight module is composed of a plurality of counterweight blocks 5 detachably connected to the load-bearing platform 1. In this embodiment, the weight of each counterweight block 5 is 50 kg. In order to facilitate the detachability of the counterweight block 5 from the load-bearing platform 1, a plurality of chutes 51 (such as dovetail grooves, etc.) are provided on the higher side of the load-bearing platform 1 along the length direction of the load-bearing platform 1. At the same time, the plurality of chutes 51 are symmetrically provided along the longitudinal axis of the load-bearing platform 1, and the bottom of each counterweight block 5 is fixedly connected to a slider that cooperates with the chutes 51. When the counterweight blocks 5 are installed on the load-bearing platform 1, the counterweight blocks 5 should also be symmetrically installed on the load-bearing platform 1 so that the weight of the load-bearing platform 1 remains balanced.

[0022] In order to facilitate the connection between the load-bearing platform 1 and the overhead crane in the present invention, lifting ears 11 are provided on both the front and rear sides of the higher side of the load-bearing platform 1, thereby facilitating the connection between the load-bearing platform 1 and the overhead crane.

[0023] In the present invention, an electromagnetic support seat 2 for placing a hydraulic cylinder is provided on the lower side of the load-bearing platform 1. When the present invention is used, the hydraulic cylinder is placed on the electromagnetic support seat 2 and energized. At this time, the electromagnetic support seat 2 generates a magnetic force to attract the hydraulic cylinder. On the one hand, the hydraulic cylinder is fixed to the electromagnetic support seat 2, and the hydraulic cylinder is placed on the electromagnetic support seat 2, which prevents the hydraulic cylinder from falling during the movement of the load-bearing platform 1. On the other hand, the magnetic attraction fixing method can avoid the problem of bolt damage to the hydraulic cylinder compared to the bolt fixing method.

[0024] To facilitate fine-tuning the position of the hydraulic cylinder and ensure it is correctly positioned, the lower side of the load-bearing platform 1 is fixedly connected to the bottom of the electromagnetic support seat 2 via a horizontal adjustment mechanism 3 and a vertical adjustment mechanism. In this embodiment, the horizontal adjustment mechanism 3 includes an adjustment slot 31 provided along the length of the load-bearing platform 1 on the lower side of the load-bearing platform 1. This adjustment slot 31 coincides with the longitudinal axis of the load-bearing platform 1. An adjustment block 32 slides within the adjustment slot 31, and a rotatable screw 33 is provided along its length. The screw 33 extends through the adjustment block 32 within the adjustment slot 31 and is threadedly connected to the adjustment block 32. The top of the adjustment block 32 is connected to the electromagnetic support seat 2 via the vertical adjustment mechanism. When fine-tuning the position of the hydraulic cylinder horizontally is required, the screw 33 can be rotated to drive the adjustment block 32 to move within the adjustment slot 31, thereby driving the vertical adjustment mechanism, the electromagnetic support seat 2, and the hydraulic cylinder to move along the longitudinal axis of the load-bearing platform 1, thereby achieving the purpose of fine-tuning the position of the hydraulic cylinder horizontally.

[0025] In order to facilitate the rotation of the screw rod 33, one end of the screw rod 33 extends to the outside of the load-bearing platform 1 and is fixedly provided with a handwheel. The screw rod 33 is rotated by turning the handwheel. Of course, since the hydraulic cylinder is heavy, it is not easy for construction workers to turn the handwheel. The above-mentioned handwheel can be replaced by a drive motor. The drive motor is fixed to the side wall of the load-bearing platform 1, and the output shaft of the drive motor extends into the adjustment slot 31 and is connected to the end of the screw rod 33. The screw rod 33 is rotated by the drive motor, thereby achieving the purpose of fine-tuning the position of the hydraulic cylinder in the horizontal direction.

[0026] In this embodiment, the vertical adjustment mechanism includes multiple hydraulic rods 4 arranged vertically on the top of the adjustment block 32. Specifically, the top end of each hydraulic rod 4 is fixedly connected to the top of the electromagnetic placement seat 2, and the bottom end of each hydraulic rod 4 is fixedly connected to the top of the adjustment block 32. By adjusting the length of all hydraulic rods 4 at the same time, the purpose of adjusting the position of the electromagnetic placement seat 2 in the vertical direction is achieved.

[0027] The present invention also provides a method for replacing a rolling mill press-down hydraulic cylinder, comprising the following steps: S1. Place an appropriate number of counterweights 5 on the load-bearing platform 1 and fix the hydraulic cylinder on the electromagnetic placement seat 2.

[0028] S2. Lift the upper support roller upwards, remove the old hydraulic cylinder, and then move the load-bearing platform 1 to place the new hydraulic cylinder in a suitable position.

[0029] S3, fine-tuning the position of the hydraulic cylinder on the load-bearing platform 1 through the horizontal adjustment mechanism 3 and the vertical adjustment mechanism. In this step, the adjustment range of the horizontal adjustment mechanism 3 is 0-500mm, and the adjustment range of the vertical adjustment mechanism is 0-100mm.

[0030] S4. Install the hydraulic cylinder on the bearing platform 1 in place, cut off the power to the electromagnetic placement seat 2, and then move the bearing platform 1 to separate the electromagnetic placement seat 2 and the hydraulic cylinder to complete the replacement of the hydraulic cylinder.

[0031] In the above-mentioned embodiment, the present invention provides a rolling mill press-down hydraulic cylinder replacement device and method. The present invention can complete the replacement of the hydraulic cylinder without completely withdrawing the upper support roller, thereby shortening the replacement time of the hydraulic cylinder. It can also prevent the intrusion of external contaminants caused by repeated disassembly and assembly of the oil pipe, thereby preventing the service life of the servo valve from being shortened. The electromagnetic placement seat in the present invention can fix the hydraulic cylinder to the load-bearing platform, thereby avoiding the problem that bolt fixing may cause damage to the hydraulic cylinder. At the same time, the counterweight module provided in the present invention can maintain balance between the hydraulic cylinder and the counterweight module when the hydraulic cylinder is placed on the electromagnetic placement seat, preventing the weight imbalance on both sides of the load-bearing platform from shifting the center of gravity and tilting. The vertical adjustment mechanism and horizontal adjustment mechanism provided in the present invention can fine-tune the position of the hydraulic cylinder when the load-bearing platform drives the hydraulic cylinder to move below the upper support roller, thereby more accurately adjusting the position of the hydraulic cylinder. Since the counterweight module in the present invention is composed of multiple counterweight blocks, the weight of the counterweight module can be flexibly adjusted according to the weight of the hydraulic cylinder to be replaced, making the present invention applicable to the replacement of various types of hydraulic cylinders, thereby improving the applicability of the present invention.

[0032] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements made to the technical solution of the present invention by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content for which protection is sought in the present invention is fully set forth in the claims.

Claims

1. A rolling mill press-down hydraulic cylinder replacement device, characterized in that: The invention comprises a step-shaped load-bearing platform (1) connected to a crown crane, wherein a counterweight module is provided on one side of the step-shaped upper portion of the load-bearing platform (1), and an electromagnetic placement seat (2) for placing a hydraulic cylinder is provided on one side of the step-shaped lower portion of the load-bearing platform (1), wherein the electromagnetic placement seat (2) is connected to the side of the step-shaped lower portion of the load-bearing platform (1) via a vertical adjustment mechanism and a horizontal adjustment mechanism (3).

2. The rolling mill screw-down hydraulic cylinder replacement device according to claim 1, characterized in that: The total weight of the counterweight module is 1.2-1.5 times the weight of the hydraulic cylinder to be replaced.

3. The rolling mill screw-down hydraulic cylinder replacement device according to claim 1, characterized in that: The counterweight module comprises a plurality of counterweight blocks (5) detachably connected to one side of the load-bearing platform (1) located at the stepped upper portion thereof.

4. The rolling mill screw-down hydraulic cylinder replacement device according to claim 3, characterized in that: The load-bearing platform (1) is provided with a plurality of slide grooves (51) on one side of the stepped upper portion thereof along the length direction of the load-bearing platform (1), and the plurality of slide grooves (51) are symmetrically arranged along the length axis of the load-bearing platform (1); at the same time, each counterweight (5) is connected to the corresponding slide groove (51) via a slider adapted to the slide groove (51).

5. The rolling mill screw-down hydraulic cylinder replacement device according to claim 1, characterized in that: The horizontal adjustment mechanism (3) is located at the stepped lower portion of the load-bearing platform (1), the electromagnetic placement seat (2) is located above the horizontal adjustment mechanism (3), and the electromagnetic placement seat (2) and the horizontal adjustment mechanism (3) are connected via the vertical adjustment mechanism.

6. The rolling mill screw-down hydraulic cylinder replacement device according to claim 1, characterized in that: The horizontal adjustment mechanism (3) comprises an adjustment groove (31) provided at the stepped lower portion of the load-bearing platform (1) along the length direction of the load-bearing platform (1), wherein an adjustment block (32) connected to the vertical adjustment mechanism is fitted in the adjustment groove (31); wherein a screw rod (33) penetrating the adjustment block (32) is rotatably connected in the adjustment groove (31), and the screw rod (33) is threadedly connected to the penetrating adjustment block (32).

7. The rolling mill screw-down hydraulic cylinder replacement device according to claim 6, characterized in that: The vertical adjustment mechanism comprises a plurality of hydraulic rods (4) vertically arranged on the top of the adjustment block (32), the top end of each hydraulic rod (4) being fixedly connected to the top of the electromagnetic placement seat (2), and the bottom end of each hydraulic rod (4) being fixedly connected to the top of the adjustment block (32).

8. A method for replacing a rolling mill press-down hydraulic cylinder, characterized in that: The method of using the rolling mill press-down hydraulic cylinder replacement device according to any one of claims 1 to 7 comprises the following steps: S1. Place an appropriate number of counterweights (5) on the load-bearing platform (1) and fix the hydraulic cylinder on the electromagnetic placement seat (2); S2. Lift the upper support roller upwards and remove the old hydraulic cylinder. Then move the load-bearing platform (1) and place the new hydraulic cylinder in a suitable position. S3, fine-tuning the position of the hydraulic cylinder on the load-bearing platform (1) through the horizontal adjustment mechanism (3) and the vertical adjustment mechanism; S4. Install the hydraulic cylinder on the bearing platform (1) in place, cut off the power to the electromagnetic placement seat (2), and then move the bearing platform (1) to separate the electromagnetic placement seat (2) and the hydraulic cylinder to complete the replacement of the hydraulic cylinder.

9. A method for replacing a rolling mill screw-down hydraulic cylinder according to claim 8, characterized in that: In step S3, the adjustment range of the horizontal adjustment mechanism (3) is 0-500 mm, and the adjustment range of the vertical adjustment mechanism is 0-100 mm.

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