A 3500mm wide plate mill stand assembly method

Abstract

The application discloses a kind of 3500mm wide plate mill rack assembly method, by using hydraulic cylinder lateral push inlet side bottom plate translation, solve 3500mm wide plate mill in limited space range Large rack whole assembly technical problem.In assembly workshop crane lifting height is only 18 meters, cannot satisfy the requirement that crane lifting height required by rack conventional hoisting method reaches more than 20 meters.According to product structure characteristics, innovation breakthrough is carried out, and new method is explored to carry out rack assembly.A new assembly platform is built on the assembly site, two bottom plates are lifted and placed on the assembly platform for adjustment and detection, one of the bottom plates is fixed, and the other bottom plate can be translated laterally by hydraulic cylinder.The translatable bottom plate is pulled out of the rack by the hydraulic cylinder to the required distance for hoisting.The drive side rack and the operating side rack are hoisted onto the fixed bottom plate, and then the translatable bottom plate is translated laterally by the hydraulic cylinder to the position under the rack to complete the assembly of the rolling mill rack.

Description

Technical Field

[0001] This invention relates to the field of steel rolling equipment technology, specifically to a method for assembling a stand for a 3500mm wide and thick plate rolling mill. Background Technology

[0002] A heavy plate rolling mill is a large-scale mechanical equipment mainly used for rolling medium-thickness steel plates. The working principle of a heavy plate rolling mill is to roll thick plates using the pressure of upper and lower work rolls, thus thinning them and improving the surface quality of the plate. The rolling process requires high rolling forces and significant rolling friction, which are reflected onto the mill stand through the upper and lower work rolls, upper and lower support rolls, and pressing screws. The manufacturing quality of the heavy plate rolling mill equipment significantly affects the quality of the subsequently rolled strip. After manufacturing, the heavy plate rolling mill equipment needs to undergo trial assembly and debugging to check the dimensional accuracy of each component and for any interference between them. Simultaneously, the overall piping work on the rolling mill equipment must be completed to facilitate direct installation at the user's site.

[0003] The assembly of the stand for a heavy plate rolling mill is crucial to the entire mill system and forms the foundation for its installation. Currently, the main components of the 3500mm heavy plate rolling mill stand assembly consist of the roughing mill drive-side stand, the roughing mill operating-side stand, the upper crossbeam, the lower crossbeam, the inlet-side bottom plate, and the outlet-side bottom plate, among others. Figure 1 As shown.

[0004] The current standard assembly techniques for rolling mill stand equipment are as follows:

[0005] 1. Select the assembly site based on the mill base plate elevation, frame height, and the total height of the assembled frame;

[0006] 2. Arrange and adjust the position of the rolling mill base plates on the assembly site according to the elevation requirements;

[0007] 3. Hoist the frame onto the base plate one by one;

[0008] 4. Hoist the lower crossbeam into the frame;

[0009] 5. Use jacks to open the upper part of the frame and hoist the upper crossbeam into the frame.

[0010] The base plate of a 3500mm wide and heavy plate rolling mill weighs 58,600 kg, is 8,440 mm long, 1,500 mm wide, and 710 mm thick. The stand weighs 335,872 kg, is 14,065 mm high, 5,180 mm wide, and has a maximum thickness of 2,060 mm. After the base plate is adjusted, the height from its top surface to the assembly ground is approximately 3,500 mm. The stand is hoisted from above the base plate, with a hoisting height of approximately 20 meters (including the base plate height, stand height, and hoisting wire rope length). If the 3500mm wide and heavy plate rolling mill stand is assembled using conventional methods, the assembly site needs a crane with a lifting capacity of at least 350 tons and a hoisting height of at least 20 meters. This assembly process is not only time-consuming, labor-intensive, and expensive, but also has high requirements for the assembly site. For some sites with limited space, assembling a 3500mm wide and heavy plate rolling mill stand is difficult to achieve. Summary of the Invention

[0011] To address the technical challenge of assembling a large stand for a 3500mm wide and thick plate rolling mill within a limited space, this invention provides a method for assembling a 3500mm wide and thick plate rolling mill stand. This method innovatively overcomes key assembly technical difficulties by using a hydraulic cylinder to laterally push the base plate to a position below the stand, thereby completing the assembly of the rolling mill stand.

[0012] The technical solution provided by this invention is as follows:

[0013] A method for assembling a stand for a 3500mm wide and thick plate rolling mill includes the following steps:

[0014] S1. Prepare the square boxes, steel plates, assembly plates, adjusting shims, leveling shims, and hydraulic cylinders required for building the assembly platform.

[0015] S2. Conduct a horizontal elevation test on the assembly site, and grind the base surface of the assembly site flat according to the test results, so that the total horizontal elevation error is ≤3mm.

[0016] S3. Lay steel plates on the polished assembly site, place multiple assembly flat plates on the laid steel plates, evenly distribute multiple square boxes on the left assembly flat plate, and press the square boxes firmly; evenly distribute the same number of square boxes at the same position on the right assembly flat plate, weld all the square boxes on the right side into one piece, and set multiple hydraulic cylinders on the side of the square boxes.

[0017] S4. Arrange equal-height shims on the assembly plate on the right side corresponding to the support position of the bottom surface of the frame. The distance from the upper surface of the equal-height shims to the upper surface of the right square box is set as the first distance. Place the inlet side bottom plate and the outlet side bottom plate on the right and left square boxes respectively.

[0018] S5. Detect and adjust the distance, diagonal dimensions, levelness, and parallelism between the inlet side bottom plate and the outlet side bottom plate;

[0019] S6. The first frame and the second frame are respectively suspended on the bottom plate on the outlet side and the equal height pad on the right side;

[0020] S7. Using the hydraulic cylinder, the inlet side bottom plate is pushed horizontally into the space below the first frame and the second frame. After it is moved into place, the height of the inlet side bottom plate is adjusted until it contacts the bottom surface of the frame.

[0021] S8. Use bolts to connect the lower crossbeam to the first frame and the second frame as a whole, and assemble the key into the frame and the lower crossbeam;

[0022] S9. Use a jack to separate the upper part of the first frame from the upper part of the second frame, hoist the upper crossbeam into the frame, and assemble the key into the frame and the upper crossbeam.

[0023] Furthermore, in step S3, the thickness of the steel plate is 30mm;

[0024] Placing the multiple assembly plates on the laid steel plate includes the following steps:

[0025] The upper surfaces of five 3m×6m×0.5m assembly plates are placed on a machine tool and machined to a bright finish.

[0026] Two of the assembly plates are placed end to end along the first direction on the left side of the laid steel plate, and the other three assembly plates are laid in a C-shape on the right side of the steel plate, ensuring that the two ends of the assembly plates on the left and right sides are aligned.

[0027] Use shims to padded and level all the assembly plates and the steel plates.

[0028] Further, in step S3, the process of evenly distributing multiple square boxes on the left-side assembly plate and firmly fixing them in place; evenly distributing the same number of square boxes at the same position on the right-side assembly plate, welding all the square boxes on the right side together, and setting multiple hydraulic cylinders on the sides of the square boxes includes the following steps:

[0029] The top and bottom surfaces of eight 1.5m×1.5m×2m square boxes were machined to a smooth finish using a machine tool.

[0030] Four square boxes are evenly distributed on the two assembly plates on the left side, and a first adjusting shim is placed under the square box. After the position is adjusted, a pressure plate is used to press all the square boxes on the left side firmly.

[0031] Four more square boxes are evenly distributed on the three assembly plates on the right side. The position of the square boxes on the right side is consistent with that on the left side. A second adjusting shim is placed on the upper side of the square box on the right side. The tooling base plate is welded to the plane on the right side of the square box away from the square box on the left side. The lower parts of the four square boxes are welded together on the other side with a reinforcing plate.

[0032] Two hydraulic cylinders are spaced apart on the tooling base plate to provide propulsion for the translation of the right square box. After the hydraulic cylinders are fixed, the tooling steel plate is used to connect the hydraulic cylinders to the tooling base plate as a whole.

[0033] Furthermore, in step S4, the first distance is 2195mm.

[0034] Furthermore, in step S6, before placing the first frame and the second frame onto the outlet side bottom plate and the equal-height pad on the right side, the method further includes:

[0035] Adjust the inlet side bottom plate to be 1-2 mm lower than the upper surface of the outlet side bottom plate.

[0036] Further, in step S6, the step of suspending the first frame and the second frame on the outlet side bottom plate and the equal-height pad on the right side respectively includes the following steps:

[0037] The first frame is suspended on the inlet side bottom plate and the equal-height pad;

[0038] According to the installation position of the lower crossbeam, the lower crossbeam is first hoisted to one side of the first frame;

[0039] The second frame is hoisted onto the entrance side base plate and the leveling pad. During the hoisting process, the lower crossbeam is lifted using a crane hook and fixed to the second frame with bolts.

[0040] Further, in step S9, after using jacks to separate the first frame from the upper part of the second frame, hoisting the upper crossbeam into the frame, and assembling the key into the frame and the upper crossbeam, the process further includes:

[0041] Steel wire ropes are suspended above the windows and on both sides of the first and second machine frames, and oil tanks and counterweights are placed below the first and second machine frames.

[0042] Between the two archways of the first frame and the second frame, a steel wire rope bracket is used, or a support rod is fixed on the outside of the first frame and the second frame and a steel wire rope is pulled.

[0043] Data testing and debugging are performed on the first and second racks.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] This invention provides a method for assembling a 3500mm wide and thick plate rolling mill stand. By using a hydraulic cylinder to laterally push the inlet-side base plate, it solves the technical problem of assembling a large stand within a limited space in a 3500mm wide and thick plate rolling mill. Since the overhead crane in the assembly workshop only has a lifting height of 18 meters, it cannot meet the requirement of a lifting height of over 20 meters required for conventional stand hoisting methods. Based on the product's structural characteristics, this invention innovates and explores a new method for stand assembly. An assembly platform is built on the assembly site. Two base plates are hoisted onto the platform and adjusted and tested. One base plate is fixed, while the other can be laterally pushed and moved using a hydraulic cylinder. The hydraulic cylinder is used to pull the movable base plate outwards to the distance required for stand hoisting. The drive-side and operating-side stands are hoisted onto the fixed base plate, and then the movable base plate is laterally pushed by the hydraulic cylinder to a position below the stand, completing the rolling mill stand assembly. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the general assembly of the 3500mm wide and thick plate rolling mill stand mentioned in this invention;

[0047] Figure 2 This is a schematic diagram of the structure of the inlet side bottom plate and the outlet side bottom plate in an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the rack structure mentioned in the embodiments of the present invention;

[0049] Figure 4 This is a schematic diagram of the assembly plate structure in an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the arrangement of the square box and adjusting shims in an embodiment of the present invention. Figure 1 ;

[0051] Figure 6 This is a schematic diagram of the arrangement of the square box and adjusting shims in an embodiment of the present invention. Figure 2 ;

[0052] Figure 7 This is a schematic diagram of the arrangement of equal-height shims in an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the assembly of a 3500mm wide and thick plate rolling mill frame in an embodiment of the present invention.

[0054] The attached figures are labeled as follows:

[0055] 1-Roughing mill drive side frame, 2-Roughing mill operation side frame, 3-Upper crossbeam, 4-Lower crossbeam, 5-Inlet side bottom plate, 6-Outlet side bottom plate, 7-Fixed rail, 8-Assembly plate, 9-Square box, 10-First adjusting shim, 11-Second adjusting shim, 12-Hydraulic cylinder, 13-Tooling steel plate, 14-Equal height shim, 15-First frame, 16-Second frame. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0057] Therefore, the detailed description of the embodiments of this application provided below with reference to the accompanying drawings is intended merely to illustrate selected embodiments of this application and is not intended to limit the scope of protection claimed by this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0058] It should be understood that in the description of embodiments of the present invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of the stated features.

[0059] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0060] See Figure 1The assembly of the heavy plate rolling mill stand is crucial to the entire rolling mill system, serving as its foundation. The 3500mm heavy plate rolling mill stand assembly mainly consists of the roughing mill drive side stand 1, the roughing mill operation side stand 2, the upper crossbeam 3, the lower crossbeam 4, the inlet side base plate 5, the outlet side base plate 6, and the fixed rails 7. The specific structure of this heavy plate rolling mill stand is existing technology; the connections between the components will not be elaborated here. The dimensions of the key components are as follows: Figure 1 It has already been marked.

[0061] The single base plate of the 3500mm wide and thick plate rolling mill weighs 58600Kg, is 8440mm long, 1500mm wide, and 710mm thick. A schematic diagram of the base plate is shown below. Figure 2 As shown, the base plate here refers to either the inlet-side base plate 5 or the outlet-side base plate 6. The inlet-side base plate 5 and the outlet-side base plate 6 have identical structures. The single-chip microcomputer frame weighs 335,872 kg, is 14,065 mm high, 5,180 mm wide, and has a maximum thickness of 2,060 mm. A schematic diagram of the frame is shown below. Figure 3 As shown, the rack here refers to Figure 1 The roughing mill stand is either the drive-side stand 1 or the operating-side stand 2. After the base plate is adjusted, the height from the upper plane to the assembly ground is approximately 3500mm. The stand is hoisted from above the base plate, with a hoisting height of approximately 20 meters (including the height of the base plate, the stand height, and the length of the hoisting wire rope). If the assembly of a 3500mm wide and thick plate rolling mill stand is carried out using conventional methods, the assembly site needs to be equipped with a crane with a lifting capacity of at least 350 tons, and the crane's lifting height must be at least 20 meters. This assembly process is not only time-consuming, labor-intensive, and expensive, but also has high requirements for the assembly site. For some sites with limited space, assembling a 3500mm wide and thick plate rolling mill stand is difficult to achieve.

[0062] To address the aforementioned problems, this application provides a method for assembling the stand of a 3500mm wide and thick plate rolling mill, comprising the following steps:

[0063] S1. Prepare the square box 9, steel plate, assembly plate 8, adjusting shims, leveling shims 14, and hydraulic cylinder 12 required for building the assembly platform.

[0064] S2. Perform horizontal elevation testing on the assembly site, and grind the base surface of the assembly site smooth according to the test results, so that the total horizontal elevation error is ≤3mm.

[0065] S3. Lay steel plates on the polished assembly site, place multiple assembly flat plates 8 on the laid steel plates, evenly distribute multiple square boxes 9 on the left side of the assembly flat plate 8, and press the square boxes 9 firmly; evenly distribute the same number of square boxes 9 at the same position on the right side of the assembly flat plate 8, weld all the square boxes 9 on the right side into one piece, and set multiple hydraulic cylinders 12 on the side of the square boxes 9.

[0066] S4. Arrange leveling pads 14 on the assembly plate 8 on the right side corresponding to the support position of the bottom surface of the frame. The distance from the upper surface of the leveling pads 14 to the upper surface of the right square box 9 is set as the first distance. Place the inlet side bottom plate 5 and the outlet side bottom plate 6 on the right and left square boxes 9 respectively.

[0067] S5. Detect and adjust the distance, diagonal dimensions, horizontality, and parallelism between the inlet side base plate 5 and the outlet side base plate 6.

[0068] S6. The first frame 15 and the second frame 16 are respectively suspended on the bottom plate 6 on the outlet side and the equal height pad 14 on the right side.

[0069] S7. Using the hydraulic cylinder 12, the inlet side base plate 5 is pushed horizontally into the space below the first frame 15 and the second frame 16. After it is moved into place, the height of the inlet side base plate 5 is adjusted until it contacts the bottom surface of the frame.

[0070] S8. Use bolts to connect the lower crossbeam 4 to the first frame 15 and the second frame 16 to form a whole, and assemble the key into the frame and the lower crossbeam 4.

[0071] S9. Use a jack to open the upper part of the first frame 15 and the second frame 16, hoist the upper crossbeam 3 into the frame, and assemble the key into the frame and the upper crossbeam 3.

[0072] Optionally, in step S3, the thickness of the steel plate is 30 mm.

[0073] Placing the multiple assembly plates 8 onto the laid steel plate includes the following steps:

[0074] S301. Place the upper surface of 5 3m×6m×0.5m assembly plates 8 on a machine tool for machining until exposed to light.

[0075] S302. Place two of the assembly plates 8 end to end along the first direction on the left side of the laid steel plate, and lay the other three assembly plates 8 in a C-shape on the right side of the steel plate, ensuring that the two ends of the assembly plates 8 on the left and right sides are aligned.

[0076] S303. Use shims to padded and level all the assembly plates 8 and the steel plate.

[0077] Optionally, in step S3, multiple square boxes 9 are evenly distributed on the assembly plate 8 on the left side and the square boxes 9 are pressed firmly; the same number of square boxes 9 are evenly distributed at the same position on the assembly plate 8 on the right side, all the square boxes 9 on the right side are welded together, and multiple hydraulic cylinders 12 are provided on the side of the square boxes 9, including the following steps:

[0078] S304. The upper and lower surfaces of 8 square boxes 9, each 1.5m × 1.5m × 2m, are machined to a smooth finish using a machine tool.

[0079] S305. Four square boxes 9 are evenly distributed on the two assembly plates 8 on the left side, and a first adjusting shim 10 is placed under the square box 9. After adjusting the position, all the square boxes 9 on the left side are pressed firmly with a pressure plate.

[0080] S306. Four more square boxes 9 are evenly distributed on the three assembly plates 8 on the right side. The position of the square boxes 9 on the right side is consistent with that on the left side. A second adjusting shim 11 is placed on the upper side of the square box 9 on the right side. The shim 11 is welded to the plane of the square box 9 on the right side away from the square box 9 on the left side using a tooling base plate. The lower parts of the four square boxes 9 are welded together on the other side using a reinforcing plate. The first adjusting shim 10 and the second adjusting shim 11 are different names for the same adjusting shim.

[0081] S307. Two hydraulic cylinders 12 are spaced apart on the tooling base plate to provide a pushing force for the translation of the right square box 9. After the hydraulic cylinders 12 are fixed, the hydraulic cylinders 12 are connected to the tooling base plate as a whole using the tooling steel plate 13.

[0082] Optionally, in step S4, the first distance is 2195mm, such as... Figure 6 As shown.

[0083] Optionally, in step S6, before suspending the first frame 15 and the second frame 16 onto the outlet side base plate 6 and the equal-height pad 14 on the right side, the following steps are also included:

[0084] Adjust the upper surface of the inlet side bottom plate 5 to be 1-2 mm lower than that of the outlet side bottom plate 6.

[0085] Optionally, in step S6, the step of suspending the first frame 15 and the second frame 16 on the outlet side bottom plate 6 and the equal-height pad 14 on the right side respectively includes the following steps:

[0086] S601. The first frame 15 is suspended on the entrance side bottom plate 5 and the equal height pad 14.

[0087] S602. According to the installation position of the lower crossbeam 4, the lower crossbeam 4 is first hoisted to one side of the first frame 15.

[0088] S603. The second frame 16 is hoisted onto the entrance side base plate 5 and the equal height pad 14. During the hoisting process, the lower crossbeam 4 is lifted using a crane hook and fixed to the second frame 16 onto the first frame 15 with bolts.

[0089] Optionally, in step S9, after using jacks to open the upper parts of the first frame 15 and the second frame 16, hoisting the upper crossbeam 3 into the frame, and assembling the key into the frame and the upper crossbeam 3, the process further includes:

[0090] S901. Suspend steel wire ropes above the windows and on both sides of the first frame 15 and the second frame 16, and place oil tanks and counterweights below the first frame 15 and the second frame 16.

[0091] S902. Between the two arches of the first frame 15 and the second frame 16, a steel wire rope bracket is used or a support rod is fixed on the outside of the first frame 15 and the second frame 16 and a steel wire rope is pulled.

[0092] S903. Perform data detection and debugging on the first frame 15 and the second frame 16.

[0093] Example 1

[0094] This embodiment provides a method for assembling a 3500mm wide and thick plate rolling mill stand, achieving an innovative breakthrough in key assembly technology. The method utilizes a hydraulic cylinder 12 to laterally push the base plate to a position below the stand, thus completing the mill stand assembly. This method is applicable to assembly workshops where the lifting height of a typical overhead crane is only 18 meters.

[0095] The assembly process of the 3500mm wide and thick plate rolling mill stand mainly includes: assembly platform construction—base plate—first stand 15—lower crossbeam 4—second stand 16—upper crossbeam 3, etc., and the specific implementation method is as follows:

[0096] 1. Conduct a leveling test on the assembly site and grind the foundation surface of the site smooth according to the test results. The total leveling error should be ≤3mm.

[0097] 2. Lay a 30mm thick steel plate on the polished and prepared assembly site to increase the contact area with the ground and increase the load-bearing area of ​​the ground foundation.

[0098] 3. Assemble five 3m×6m×0.5m flat plates (e.g., ...). Figure 4 The upper surface is machined to a bright finish on a machine tool and then... Figure 5As shown, place it on the laid steel plate. Use shims to padded and level the assembly plate 8 between it and the steel plate.

[0099] 4. The top and bottom surfaces of the eight 1.5m×1.5m×2m square boxes 9 need to be machined to a smooth finish to reduce frictional resistance during use and prepare for subsequent movement and adjustment of the base plate position.

[0100] 5. Press Figure 5 As shown, on the two assembly plates 8 on the left, four square boxes 9 are evenly distributed according to the length dimension 8440mm of the bottom plate 5 on the entrance side. Adjusting shims are placed under the square boxes 9. The square boxes 9 and the adjusting shims should be placed near the bolt holes of the bottom plate. After adjusting the position, the square box 9 on the east side is pressed firmly with a pressure plate.

[0101] 6. Press Figure 5 As shown, on the three assembly plates 8 on the right, four square boxes 9 are evenly distributed according to the length dimension of the export side base plate 6 (8440mm), with their positions consistent with the east side. Adjusting shims are placed on the upper side of the square boxes 9, and the square boxes 9 and adjusting shims should be placed near the bolt holes of the base plate. The tooling base plate is welded to the rightmost plane of the square boxes 9, and the lower parts of the four square boxes 9 are welded together with a reinforcing plate on the opposite side, which is exactly on the arc surface of the lower part of the frame. This does not interfere with the frame assembly, making it a whole and ensuring the consistency and stability of the subsequent lateral translation of the base plate.

[0102] 7. Press Figure 6 As shown, on the right-side assembly plate 8, two hydraulic cylinders 12 are arranged at the tooling base plate position to provide the driving force for the translation of the square box 9. After the hydraulic cylinders 12 are fixed, the hydraulic cylinders 12 are connected to the tooling base plate as a whole using the tooling steel plate 13.

[0103] 8. Use hydraulic cylinder 12 to push the tooling base plate and drive the square box 9 to reciprocate, ensuring that it can move flexibly and without jamming, and that the square box 9 can move into place.

[0104] 9. Place leveling shims 14 at the bottom support position on the right side of the frame, adjust to be level, and ensure the distance from the upper surface of the leveling shims 14 to the upper surface of the square box 9 is 2195mm. Figure 7 As shown.

[0105] 10. Place the two bottom plates, the inlet side bottom plate 5 and the outlet side bottom plate 6, onto the prepared equal-height square box 9.

[0106] 11. Use hydraulic cylinder 12 to push the square box 9 from the side to drive the base plate to reciprocate, ensuring that the movement is flexible and unobstructed, and that the base plate can move into place.

[0107] 12. Inspect and adjust the spacing, diagonal dimensions, levelness, and parallelism of the inlet side bottom plate 5 and the outlet side bottom plate 6.

[0108] 13. Adjust the inlet side bottom plate 5 to be 1-2mm lower than the upper surface of the outlet side bottom plate 6, so that the inlet side bottom plate 5 can be moved horizontally after the frame is hoisted.

[0109] 14. Hoist the first frame 15 onto the fixed base plate and the leveling pads 14, as follows: Figure 8 As shown. When the frame is about to contact the inlet side base plate 5, install two tooling pins as guides to ensure that the frame and the inlet side base plate 5 are in the correct position.

[0110] 15. Based on the installation position of the lower crossbeam 4, first hoist the lower crossbeam 4 to the side of the first frame 15.

[0111] 16. Hoist the second frame 16 onto the fixed base plate and the leveling pads 14, as follows: Figure 8 As shown, when the frame is about to be lowered onto the fixed base plate, the lower crossbeam 4 is lifted using a crane hook and bolted to the second piece frame 16 and the first piece frame 15. Together, they are slowly lifted onto the outlet side base plate 6. When the frame is about to contact the outlet side base plate 6, two tooling pins are installed as guides to ensure the frame and outlet side base plate 6 are correctly positioned. Simultaneously, a crane is used for safety protection.

[0112] 17. Use hydraulic cylinder 12 to slide the inlet side base plate 5 into the space under the two frames. After it is in place, use the first adjusting shim 10 to raise the height of the inlet side base plate 5 until it contacts the bottom surface of the frame.

[0113] 18. Connect the lower crossbeam 4 to the two frames with bolts to form a whole, and assemble the key into the frame and the lower crossbeam 4.

[0114] 19. Use jacks to open the upper parts of the two frames, hoist the upper crossbeam 3 into the frame, remove the jacks after assembly, and tighten with appropriate parts. Then assemble the key into the frame and the upper crossbeam 3.

[0115] 20. Above the windows and on both sides of the two frames, steel wire ropes are suspended, and a tank containing high-viscosity oil (self-provided) and a counterweight are placed below; between the two archways, steel wire rope supports are used or support rods (self-provided) are fixed to the outside of the two frames and steel wire ropes are pulled for measurement.

[0116] This invention provides a method for assembling a 3500mm wide and thick plate rolling mill stand. By using a hydraulic cylinder to laterally push the bottom plate on the inlet side to move horizontally, it solves the technical problem of assembling a large stand in a limited space within a 3500mm wide and thick plate rolling mill.

[0117] Because the overhead crane in the assembly workshop only has a lifting height of 18 meters, it cannot meet the requirement of a lifting height of over 20 meters required for conventional frame hoisting methods. Based on the product's structural characteristics, innovative breakthroughs were made to explore new methods for frame assembly. An assembly platform was built on the assembly site, and two base plates were hoisted onto the platform for adjustment and testing. One base plate was fixed in place, while the other could be moved laterally using a hydraulic cylinder. The movable base plate was then pulled outwards by the hydraulic cylinder to the distance required for frame hoisting. The drive-side frame and the operating-side frame were hoisted onto the fixed base plate, and then the movable base plate was moved laterally under the frame using the hydraulic cylinder to complete the mill frame assembly.

[0118] The two racks underwent relevant data testing and debugging. The above description is merely the preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for assembling a stand for a 3500mm wide and thick plate rolling mill, characterized in that, Includes the following steps: S1. Prepare the square boxes, steel plates, assembly plates, adjusting shims, leveling shims, and hydraulic cylinders required for building the assembly platform. S2. Conduct a horizontal elevation test on the assembly site, and grind the base surface of the assembly site flat according to the test results, so that the total horizontal elevation error is ≤3mm. S3. Lay steel plates on the polished assembly site, place multiple assembly flat plates on the laid steel plates, evenly distribute multiple square boxes on the left assembly flat plate, and press the square boxes firmly; evenly distribute the same number of square boxes at the same position on the right assembly flat plate, weld all the square boxes on the right side into one piece, and set multiple hydraulic cylinders on the side of the square boxes. S4. Arrange equal-height shims on the assembly plate on the right side corresponding to the support position of the bottom surface of the frame. The distance from the upper surface of the equal-height shims to the upper surface of the right square box is set as the first distance. Place the inlet side bottom plate and the outlet side bottom plate on the right and left square boxes respectively. S5. Detect and adjust the distance, diagonal dimensions, levelness, and parallelism between the inlet side bottom plate and the outlet side bottom plate; S6. The first frame and the second frame are respectively suspended on the bottom plate on the outlet side and the equal height pad on the right side; S7. Using the hydraulic cylinder, the inlet side bottom plate is pushed horizontally into the space below the first frame and the second frame. After it is moved into place, the height of the inlet side bottom plate is adjusted until it contacts the bottom surface of the frame. S8. Use bolts to connect the lower crossbeam to the first frame and the second frame as a whole, and assemble the key into the frame and the lower crossbeam; S9. Use a jack to separate the upper part of the first frame from the upper part of the second frame, hoist the upper crossbeam into the frame, and assemble the key into the frame and the upper crossbeam.

2. The assembly method for a 3500mm wide and thick plate rolling mill stand according to claim 1, characterized in that: In step S3, the thickness of the steel plate is 30mm; Placing the multiple assembly plates on the laid steel plate includes the following steps: The upper surfaces of five 3m×6m×0.5m assembly plates are placed on a machine tool and machined to a bright finish. Two of the assembly plates are placed end to end along the first direction on the left side of the laid steel plate, and the other three assembly plates are laid in a C-shape on the right side of the steel plate, ensuring that the two ends of the assembly plates on the left and right sides are aligned. Use shims to padded and level all the assembly plates and the steel plates.

3. The assembly method for a 3500mm wide and thick plate rolling mill stand according to claim 2, characterized in that, In step S3, multiple square boxes are evenly distributed on the assembly plate on the left side and pressed firmly into place; the same number of square boxes are evenly distributed at the same position on the assembly plate on the right side, and all the square boxes on the right side are welded together as one unit. Multiple hydraulic cylinders are then installed on the sides of the square boxes. This includes the following steps: The top and bottom surfaces of eight 1.5m×1.5m×2m square boxes were machined to a smooth finish using a machine tool. Four square boxes are evenly distributed on the two assembly plates on the left side, and a first adjusting shim is placed under the square box. After the position is adjusted, a pressure plate is used to press all the square boxes on the left side firmly. Four more square boxes are evenly distributed on the three assembly plates on the right side. The position of the square boxes on the right side is consistent with that on the left side. A second adjusting shim is placed on the upper side of the square box on the right side. The tooling base plate is welded to the plane on the right side of the square box away from the square box on the left side. The lower parts of the four square boxes are welded together on the other side with a reinforcing plate. Two hydraulic cylinders are spaced apart on the tooling base plate to provide propulsion for the translation of the right square box. After the hydraulic cylinders are fixed, the tooling steel plate is used to connect the hydraulic cylinders to the tooling base plate as a whole.

4. The assembly method for a 3500mm wide and thick plate rolling mill stand according to any one of claims 1-3, characterized in that: In step S4, the first distance is 2195mm.

5. The assembly method for a 3500mm wide and thick plate rolling mill stand according to claim 4, characterized in that, In step S6, before placing the first frame and the second frame onto the outlet side bottom plate and the equal-height pad on the right side, the following steps are also included: Adjust the inlet side bottom plate to be 1-2 mm lower than the upper surface of the outlet side bottom plate.

6. The assembly method for a 3500mm wide and thick plate rolling mill stand according to claim 4, characterized in that, In step S6, the step of suspending the first frame and the second frame on the outlet side bottom plate and the equal-height pad on the right side respectively includes the following steps: The first frame is suspended on the inlet side bottom plate and the equal-height pad; According to the installation position of the lower crossbeam, the lower crossbeam is first hoisted to one side of the first frame; The second frame is hoisted onto the inlet side base plate and the leveling pad. During the hoisting process, the lower crossbeam is lifted using a crane hook and fixed to the second frame with bolts.

7. The assembly method for a 3500mm wide and thick plate rolling mill stand according to claim 5 or 6, characterized in that, In step S9, after using jacks to separate the upper parts of the first frame and the second frame, hoisting the upper crossbeam into the frame, and assembling the key into the frame and the upper crossbeam, the process further includes: Steel wire ropes are suspended above the windows and on both sides of the first and second machine frames, and oil tanks and counterweights are placed below the first and second machine frames. Between the two archways of the first frame and the second frame, a steel wire rope bracket is used, or a support rod is fixed on the outside of the first frame and the second frame and a steel wire rope is pulled. Data testing and debugging are performed on the first and second racks.

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