A method for installing a main body of a large rolling mill sinking assembly

Abstract

This invention relates to an installation method for a large rolling mill side-mounted assembly and relocation system, comprising: 1) setting up a pre-assembly pit on one side of the target installation position of the rolling mill, and assembling rolling mill components other than the rolling mill base in the pre-assembly pit; 2) performing offline commissioning of the rolling mill; 3) lifting the rolling mill body using a hydraulic lifting and sliding device and moving the rolling mill body longitudinally; 4) installing the rolling mill base on the rolling mill foundation, lifting the rolling mill body using a hydraulic lifting and sliding device, and then sliding it laterally to directly above the target installation position. After the rolling mill body is vertically lowered, it connects with the rolling mill base, and the rolling mill is thus installed in place. This invention addresses rolling mills where the frame height exceeds the lifting capacity of the plant crane and obstructs the crane's passage. It transports the assembled and commissioned rolling mill body to the target installation position for installation after lifting, longitudinal movement, lateral sliding, and vertical lowering, solving the problems of limited assembly height and interference with plant crane operation during assembly.

Description

Technical Field

[0001] This invention relates to the field of large rolling mill installation technology, and in particular to an installation method for pushing the main body of a large rolling mill submerged assembly next to the mill. Background Technology

[0002] Large rolling mills are typically large in size and weight, and their frame height and weight sometimes exceed the lifting capacity of the plant cranes. Existing rolling mill installation technologies mostly employ online, modular installation methods, with the most significant aspect involving the hoisting of the mill frame. Examples include Chinese invention patents such as CN106517009B ("Hoisting Equipment and Construction Method for Large Mill Stands"), CN101537973B ("Method for Continuous Hoisting of Rolling Mill Stands Using Hydraulic Jacking"), and CN104512844B ("Method for Lateral Sliding and Vertical Hydraulic Jacking Hoisting of Extra-Large Rolling Mill Stands").

[0003] Chinese invention patent CN 103469813 B discloses "an online installation method for an existing rolling mill on an existing rolling line". The method involves first using a dust-free wire saw cutting method to remove the complex underground concrete structure of the existing rolling line where the new rolling mill is to be installed online. Then, at the roll changing device of the removed part, a load-bearing structure with a concave cross section is cast. Steel beams and a moving track are then installed on the load-bearing structure. Finally, the new rolling mill is assembled on the moving track and moved to the foundation of the rolling mill via the moving track.

[0004] Chinese invention patent CN 103447304 B discloses an "online installation method for existing rolling mills." This method primarily utilizes the cooperation between the mill base and the shifting groove, connected to a slide rail, to ensure the mill base remains stationary and its upper surface remains horizontal. This provides a solid foundation for the subsequent installation of the mill stand and other components, enabling online adjustment and alignment of the mill, thus improving the accuracy of online mill installation. Furthermore, the cooperation between the mill base and the shifting groove ensures that the mill moves only in a straight line in one direction during shifting, avoiding vibration and changes in assembly accuracy. However, this online assembly method requires production shutdown and involves a long construction time, directly impacting normal production operations.

[0005] Chinese invention patent CN 113231477B discloses a "rolling mill horizontal sliding device with lifting function," comprising an X-axis transport device for transporting the rolling mill in the X direction and a Y-axis transport device for transporting the rolling mill in the Y direction and for raising and lowering the rolling mill. The usage steps are as follows: Step a: Complete the overall installation of the rolling mill on the X-axis transport device; Step b: Use the X-axis transport device to transport the rolling mill in the X direction, moving the rolling mill below the Y-axis transport device; Step c: Use the Y-axis transport device to lift the rolling mill, and then transport the rolling mill in the Y direction, moving the rolling mill above the mill pit; Step d: Use the Y-axis transport device to lower the rolling mill into the mill pit, and then install the rolling mill in the mill pit. Its advantages are: pre-installing the entire rolling mill, then transporting and lowering it, significantly reducing downtime. However, for large rolling mills whose frame height exceeds the lifting capacity of the factory crane, even if offline assembly is adopted, the frame will block the crane's travel route, making it impossible to assemble the rolling mill using the factory crane. This will also affect the normal operation of the factory crane, causing production and construction operations in other areas of the factory to be unable to proceed normally. Summary of the Invention

[0006] This invention provides an installation method for the submerged assembly and moving of the main body of a large rolling mill. For rolling mills whose frame height exceeds the lifting capacity of the plant crane and obstructs the crane's passage, a pre-assembly pit is set up in the vicinity of the target installation location on one side of the rolling production line. The main body of the rolling mill is assembled in the pre-assembly pit, and pipelines can be connected for offline debugging. After assembly and debugging, the main body of the rolling mill is lifted, moved longitudinally, slid laterally, and lowered vertically to the target installation location for installation. This reduces the height of the rolling mill in the plant during assembly, solves the problems of limited assembly height and interference with the operation of the plant crane during assembly, greatly reduces the installation difficulty, and can significantly shorten the downtime of the rolling line during the installation of the rolling mill.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A method for installing a large rolling mill side-mounted submerged assembly body includes the following steps:

[0009] 1) A pre-assembly pit is set up on one side of the target installation position of the rolling mill. The pre-assembly pit is connected to the foundation pit of the roll changing device. The rolling mill components other than the rolling mill base, work rolls and support rolls are assembled in the pre-assembly pit to form the main body of the rolling mill. The transverse center line of the main body of the rolling mill is parallel to the transverse center line of the target installation position.

[0010] 2) After the main body of the rolling mill is assembled, directly connect the energy pipeline, liquid working medium pipeline and control pipeline of the rolling mill production line to carry out offline commissioning of the rolling mill;

[0011] 3) A hydraulic jacking and sliding device is installed above the pre-assembly pit to lift the main body of the rolling mill and move the main body of the rolling mill longitudinally so as to adjust the transverse center line of the main body of the rolling mill to be in the same vertical plane as the transverse center line of the target installation position.

[0012] 4) Install the mill base on the mill foundation at the target installation position inside the mill pit. Set up a hydraulic lifting and sliding device above the mill pit to lift the main body of the mill and slide it laterally to the top of the target installation position. After the main body of the mill is vertically lowered, it is connected to the mill base. After the work rolls and support rolls are installed, the mill is installed in place.

[0013] Furthermore, in step 1), supports are set up in the pre-assembly pit, and the rolling mill components that make up the main body of the rolling mill are hoisted using a factory crane. During assembly, the rolling mill frame is first installed on the supports, and then the rolling mill frame is connected into a whole through the upper and lower crossbeams.

[0014] Furthermore, in step 3), the hydraulic jacking and sliding device includes a longitudinal track beam, a longitudinal slide rail, a sliding shoe, a longitudinal lifting beam, a transverse lifting beam, and a push-pull drive device; on the ground on both sides of the pre-assembly pit, two longitudinal track beams are arranged in parallel with the longitudinal center of the mill body as the axis of symmetry, and a longitudinal slide rail is provided on the top of each of the two longitudinal track beams; two sets of sliding shoes are installed in each longitudinal slide rail, and one longitudinal lifting beam is provided above each of the two longitudinal track beams, with the longitudinal lifting beam supported by jacks of the corresponding two sliding shoes; the transverse lifting beam passes through the window of the mill body, with the bottom surface of the transverse lifting beam contacting the top surface of the longitudinal lifting beam, and the top surface of the transverse lifting beam contacting the pressing cylinder installed at the upper crossbeam; the mill body is jacked by the synchronous movement of the four sets of sliding shoes; a push-pull drive device is provided on the longitudinal track beam to push the sliding shoes and the mill body on them to slide along the longitudinal slide rail on the longitudinal track beam.

[0015] Furthermore, lifting locks are provided at both ends of the longitudinal lifting beam.

[0016] Furthermore, the push-pull drive device is a push-pull hydraulic cylinder.

[0017] Furthermore, in step 4), the hydraulic lifting and sliding device includes columns, transverse track beams, transverse slides, sliding beams, support frames, hydraulic lifting devices, and hydraulic jacking devices. With the transverse centerline of the target installation position as the axis of symmetry, one row of columns is installed on the ground on both sides of the roll changing device pit. Two transverse track beams are respectively installed on the columns on the corresponding sides, with one end of the transverse track beam extending above the longitudinal track beam and the other end extending above the mill pit. A transverse slide is installed at the top of the transverse track beam, and the lower part of the sliding beam is embedded in the transverse slide and slidably connected to it. A support frame is installed on the sliding beam, and four sets of hydraulic lifting devices are installed on the support frame. The hydraulic lifting device has vertical steel strands, and the bottom end of the steel strands is equipped with anchors that are connected one-to-one with the lifting locks at the ends of the longitudinal lifting beams. A hydraulic jacking device is installed on the transverse track beam to push the sliding beam, its hydraulic lifting devices, and the main body of the mill along the transverse slide on the transverse track beam.

[0018] Furthermore, the support frame consists of longitudinal support beams and transverse support beams; four longitudinal support beams are arranged in parallel and divided into two groups, one group on the outside of the rolling mill body and one group on the inside of the column at both ends of the sliding beam, and each longitudinal support beam spans across two sliding beams; at the top of each group of longitudinal support beams, one transverse support beam is set at each of the corresponding two ends on the outside of the rolling mill body, and the hydraulic lifting device is set on the transverse support beam; the steel strand of the hydraulic lifting device passes downward through the through hole on the transverse support beam, between the two longitudinal support beams in the same group, and between the two sliding beams.

[0019] Furthermore, the two sliding beams are rigidly connected by a connecting rod.

[0020] Furthermore, the hydraulic lifting device is a cable-type hydraulic lifting device.

[0021] Furthermore, the hydraulic jacking device is a jacking hydraulic cylinder.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1) For large rolling mills whose height and weight exceed the lifting capacity of the factory crane, the main body of the rolling mill is assembled offline in the pre-assembly pit under normal production conditions and offline debugging is completed. During the rolling line shutdown, the main body of the rolling mill is installed in place by lifting and sliding, which greatly shortens the rolling line shutdown and renovation period.

[0024] 2) The pre-assembly pit was set up, which reduced the relative height of the rolling mill during assembly in the plant and solved the problem of height limitation or impact on the normal operation of plant cranes when using conventional offline assembly methods;

[0025] 3) The pre-assembly pit is set near the target installation position of the rolling mill and connected to the foundation pit of the rolling mill roll changing device. After the main body of the rolling mill is assembled offline, it can be directly connected to the relevant energy, medium and control pipelines to realize offline commissioning of the rolling mill. This achieves the purpose of plug-and-play after the rolling mill is in place, which can greatly reduce the online commissioning time of the rolling mill and shorten the commissioning period of the rolling mill.

[0026] 4) The hydraulic jacking and sliding device and the hydraulic lifting and sliding device are used to complete the lifting, sliding and lowering of the main body of the rolling mill. The main body is slid from the pre-assembly pit to the target installation position of the rolling mill. The sliding distance is short, the device is simple, the operation is convenient, and the safety and reliability are high.

[0027] 5) The method of the present invention does not require the removal of other equipment around the rolling mill, is less restricted by site conditions, has strong adaptability, and is safe and reliable;

[0028] 6) The main assembly of the rolling mill, excluding the mill base, is completed outside the rolling line, and offline debugging can be achieved. During online installation, only the elevation and center line of the mill base need to be adjusted, which greatly reduces the workload of online installation and adjustment, realizes the modular installation of large rolling mill equipment, reduces the difficulty of online construction, and improves construction efficiency. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the installation method for pushing the main body of a large rolling mill submerged assembly, as described in this invention.

[0031] Figure 2a This is a schematic diagram illustrating the assembly of the main body of the rolling mill within the pre-assembly pit as described in this invention.

[0032] Figure 2b yes Figure 2a Side view.

[0033] Figure 3a This is a schematic diagram of the invention, which uses a hydraulic lifting and sliding device to lift the main body of the rolling mill and move it longitudinally.

[0034] Figure 3b yes Figure 3a Side view.

[0035] Figure 4a This is a schematic diagram of the hydraulic lifting and sliding device used in this invention to lift the main body of the rolling mill.

[0036] Figure 4b yes Figure 4a Side view.

[0037] Figure 5a This is a schematic diagram of the invention using a hydraulic lifting and sliding device to achieve lateral sliding of the rolling mill body.

[0038] Figure 5b yes Figure 5a Side view.

[0039] Figure 6 This is a schematic diagram of the rolling mill body of the present invention sliding to directly above the target installation position.

[0040] Figure 7 This is a schematic diagram of the rolling mill body being lowered into the rolling mill pit as described in this invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] In the diagram: 1. Pre-assembly pit; 2. Roll changing device pit; 31. Longitudinal track beam; 32. Longitudinal slide rail; 33. Slipper; 34. Longitudinal lifting beam; 35. Transverse lifting beam; 36. Lifting lock; 37. Push-pull drive device; 41. Transverse track beam; 42. Transverse slide rail; 43. Column; 44. Sliding beam; 45. Connecting rod; 46. Longitudinal support beam; 47. Transverse support beam; 48. Hydraulic lifting device; 49. Hydraulic jacking device; 5. Rolling mill body; 51. Rolling mill frame; 52. Pressing cylinder; 53. Upper crossbeam; 54. Lower crossbeam; 6. Support pier; A. Target installation position; A1. Pre-assembly position. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, 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. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0047] The installation method for pushing the main body of a large rolling mill submerged assembly according to the present invention includes the following steps:

[0048] 1) Set up a pre-assembly pit 1 on one side of the target installation position A of the rolling mill (e.g., Figure 1 As shown), the pre-assembly pit 1 is connected to the roll changing device pit 2. Mill components, excluding the mill base, work rolls, and support rolls, are assembled within the pre-assembly pit 1 to form the main body 5 of the mill (as shown). Figure 2a , Figure 2b As shown), the transverse centerline of the main body 5 of the rolling mill is parallel to the transverse centerline of the target installation position A;

[0049] 2) After the main body 5 of the rolling mill is assembled, directly connect the energy pipeline, liquid working medium pipeline and control pipeline of the rolling mill production line to carry out offline commissioning of the rolling mill;

[0050] 3) such as Figure 3a , Figure 3b As shown, a hydraulic lifting and sliding device is installed above the pre-assembly pit 1 to lift the mill body 5 and move the mill body 5 longitudinally so as to adjust the transverse center line of the mill body 5 and the transverse center line of the target installation position A to be in the same vertical plane.

[0051] 4) Install the mill base on the mill foundation at the target installation position A within the mill pit, and install a hydraulic lifting and sliding device (such as...) above the mill pit. Figure 4a , Figure 4b , Figure 5a , Figure 5b As shown), it is used to lift the main body 5 of the rolling mill and slide it laterally to directly above the target installation position A (as shown). Figure 6 As shown), the main body 5 of the rolling mill descends vertically (as shown). Figure 7 (As shown) After connecting to the mill base, and installing the work rolls and support rolls, the mill is then installed in place.

[0052] Furthermore, in step 1), a support 6 is set in the pre-assembly pit 1, and the rolling mill components that make up the main body of the rolling mill are hoisted by the factory crane. During assembly, the rolling mill frame 51 is first installed on the support 6, and then the rolling mill frame 51 is connected into a whole by the upper crossbeam 53 and the lower crossbeam 54.

[0053] Furthermore, in step 3), the hydraulic jacking and sliding device includes a longitudinal track beam 31, a longitudinal slide rail 32, a sliding shoe 33, a longitudinal lifting beam 34, a transverse lifting beam 35, and a push-pull drive device 37; on the ground on both sides of the pre-assembly pit 1, two longitudinal track beams 31 are arranged in parallel with the longitudinal center of the rolling mill body 5 as the axis of symmetry, and the top of the two longitudinal track beams 31 is provided with a longitudinal slide rail 32; two sets of sliding shoes 33 are installed in each longitudinal slide rail 32, and one longitudinal lifting beam 34 is provided above each of the two longitudinal track beams 31. The longitudinal lifting beam 34 is supported by jacks of two corresponding sliding shoes 33; the transverse lifting beam 35 passes through the window of the mill body 5, the bottom surface of the transverse lifting beam 35 contacts the top surface of the longitudinal lifting beam 34, and the top surface of the transverse lifting beam 35 contacts the pressing cylinder 52 installed at the upper crossbeam 53; the mill body 5 is lifted by the synchronous action of the four sets of sliding shoes 33; a push-pull drive device 37 is provided on the longitudinal track beam 31 to push the sliding shoes 33 and the mill body 5 on them to slide along the longitudinal slide rail 32 on the longitudinal track beam 31.

[0054] Furthermore, lifting locks 36 are respectively provided at both ends of the longitudinal lifting beam 34.

[0055] Furthermore, the push-pull drive device 37 is a push-pull hydraulic cylinder.

[0056] Further, in step 4), the hydraulic lifting and sliding device includes columns 43, transverse track beams 41, transverse slide rails 42, sliding beams 44, support frames, hydraulic lifting devices 48, and hydraulic jacking devices 49; with the transverse centerline of the target installation position A as the axis of symmetry, one row of columns 43 is respectively set on the ground on both sides of the roll changing device pit 2; two transverse track beams 41 are respectively set on the corresponding columns 43, one end of the transverse track beam 41 extends above the longitudinal track beam 31, and the other end of the transverse track beam 41 extends above the rolling mill pit; the transverse track... The top of the track beam 41 is provided with a transverse slide rail 42, and the lower part of the sliding beam 44 is embedded in the transverse slide rail 42 and slidably connected to the transverse slide rail 42; a support frame is provided on the sliding beam 44, and four sets of hydraulic lifting devices 48 are provided on the support frame; the hydraulic lifting device 48 is provided with a vertical steel strand, and the bottom end of the steel strand is provided with an anchor that is connected to the lifting lock 36 at the end of the longitudinal lifting beam 34 in a one-to-one correspondence; a hydraulic jacking device 49 is provided on the transverse track beam 41 to push the sliding beam 44, the hydraulic lifting device 48 on it, and the rolling mill body 5 to move along the transverse slide rail 42 on the transverse track beam 41.

[0057] Furthermore, the support frame consists of longitudinal support beams 46 and transverse support beams 47; the four longitudinal support beams 46 are arranged in parallel and divided into two groups, one group is set at each end of the sliding beam 44 on the outside of the rolling mill body 5 and the inside of the column 43, and each longitudinal support beam 46 spans across the two sliding beams 44; at the top of each group of longitudinal support beams 46, one transverse support beam 47 is set at each end of the corresponding outside of the rolling mill body 5, and the hydraulic lifting device 48 is set on the transverse support beam 47; the steel strand of the hydraulic lifting device 48 passes downward through the through hole on the transverse support beam 47, the two longitudinal support beams 46 in the same group, and the two sliding beams 44 in sequence.

[0058] Furthermore, the two sliding beams 44 are rigidly connected by a connecting rod 45.

[0059] Furthermore, the hydraulic lifting device 48 is a cable-type hydraulic lifting device.

[0060] Furthermore, the hydraulic jacking device 49 is a jacking hydraulic cylinder.

[0061] To make the objectives, technical solutions, and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. The embodiments described below are some embodiments of the present invention, but not all embodiments. In conjunction with the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062]

Example

[0063] In this embodiment, one roughing mill (hereinafter referred to as the mill) in a "1+4" aluminum rolling mill production line (a 4-stand aluminum alloy hot continuous rolling production line) is replaced. The mill consists of rolls, roll bearings, stands, rails, roll adjustment devices, upper roll balancing devices, and roll changing devices. The specific construction process is as follows:

[0064] Step 1: Under normal production conditions, a pre-assembly pit 1 is set up on one side of the rolling mill to be replaced, such as... Figure 1 As shown, the pre-assembly pit 1 is arranged parallel to the rolling line, and one end is connected to the roll changing device pit 2. The main body of the rolling mill 5, including the rolling mill frame 51, upper crossbeam 53, lower crossbeam 54 and other components that can be installed offline, is assembled in the pre-assembly pit 1.

[0065] In step one, the offline assembly of the rolling mill body 5 is carried out without affecting production. In this embodiment, the location next to the operating side of the rolling mill to be replaced is selected as the offline assembly site, and a pre-assembly pit 1 is constructed. The depth of the pre-assembly pit 1 is 5.5 meters, which can ensure the hoisting height of the rolling mill frame 51 and the passage requirements of the plant crane.

[0066] like Figure 2a , Figure 2b As shown, supports 6 are pre-arranged in the pre-assembly pit 1, and mill support pads are installed on top of the supports 6 to support the mill frame 51. The mill frame 51 is hoisted using a factory crane. After the mill frame 51 is in place, its elevation, centerline, levelness, and parallelism errors are measured to ensure they meet the installation specifications. After adjusting the position of the mill frame 51, the lower crossbeam 54 is installed first, followed by the upper crossbeam 53. The mill frame 51 is connected through the upper crossbeam 53 and the lower crossbeam 54, and all contact surfaces are brought together and the connecting bolts are tightened. Then, all other components that can be installed offline are installed.

[0067] Step 2: After the main body of the rolling mill 5 is assembled, directly connect the energy pipeline, liquid working medium pipeline and control pipeline of the rolling mill production line, install hydraulic adjustment devices and other equipment, and conduct offline commissioning of the rolling mill.

[0068] Step 3: After the main body of the rolling mill 5 is assembled and offline debugging is qualified, a hydraulic jacking and sliding device is installed above the pre-assembly pit 1. For example... Figure 3a , Figure 3b As shown, with the pre-assembly position A1 of the rolling mill as the center, two parallel longitudinal track beams 31 are set on the ground on both sides above the pre-assembly pit 1. Longitudinal slide rails 32 and four sets of sliding shoes 33 are installed on the longitudinal track beams 31. The longitudinal lifting beam 34 is supported by jacks inside the sliding shoes 33. A transverse lifting beam 35, perpendicular to the longitudinal lifting beam 34, passes through the window of the rolling mill body 5. The top surface of the transverse lifting beam 35 contacts the pressing cylinder 52 installed on the rolling mill body 5. The rolling mill body 5 is supported by the sliding shoes 33, the longitudinal lifting beam 34, and the transverse lifting beam 35, thus achieving the lifting of the rolling mill body 5. Figure 4a , Figure 4b As shown, the mill body 5 is horizontally slid to the outside of the target installation position A by pushing the slipper 33 through the push-pull drive device 37, and the transverse center line of the mill body 5 and the transverse center line of the target installation position A are in the same vertical plane.

[0069] In step three, the hydraulic jacking and sliding device mainly includes a longitudinal track beam 31, a longitudinal slide rail 32, a sliding shoe 33, a longitudinal hoisting beam 34, a transverse hoisting beam 35, and a push-pull drive device 37, etc.; among which the push-pull drive device 37 adopts a jacking hydraulic cylinder.

[0070] Step 4: The rolling production line is shut down for mill replacement. After the mill to be replaced is dismantled, the new mill's base and emulsion tank are installed on the existing mill foundation within the mill pit. A hydraulic lifting and sliding device is installed above the mill pit.

[0071] like Figure 5a , Figure 5bAs shown, in this embodiment, the hydraulic lifting and sliding device includes columns 43, a transverse track beam 41, a transverse slide rail 42, a sliding beam 44, a support frame, a hydraulic lifting device 48, and a hydraulic jacking device 49. With the transverse centerline of the target installation position A as the axis of symmetry, a row of columns 43 is set on the ground on both sides of the roller changing device pit 2. In this embodiment, each row has three columns 43. Two sets of sliding devices are set on the transverse track beam 41. Each set of sliding devices includes a corresponding sliding beam 44, a support frame, two sets of hydraulic lifting devices 48, and a hydraulic jacking device 49. The hydraulic lifting device 48 is a cable-type hydraulic lifting device, and the hydraulic jacking device 49 is a jacking hydraulic cylinder.

[0072] Hydraulic jacking device 49 drives two sliding beams 44 rigidly connected by connecting rods 45. Four hydraulic lifting devices 48 are equipped with two sets of hydraulic pump stations and controllers. The columns 43, transverse track beams 41, transverse slide rails 42, and sliding beams 44 are installed sequentially. The two sliding beams 44 are rigidly connected by connecting rods 45. Longitudinal support beams 46, transverse support beams 47, and hydraulic lifting devices 48 are installed on the sliding beams 44. Steel strands are threaded through them and anchorages are installed. Hydraulic pump stations, hydraulic control systems, oil pipes, power cables, and control cables are installed. After installation, the anchorages and the lifting locks 36 at both ends of the longitudinal lifting beams 34 on the rolling mill body 5 are connected by pins. After all installations are completed, the hydraulic lifting sliding devices are subjected to overall debugging. The allowable deviation of the longitudinal centerline of the transverse slide rail 42 is 2mm, the allowable deviation of the track gauge is 2mm, and the allowable deviation of the track elevation is ±5mm.

[0073] During the lifting of the mill body 5, the steel strands in the hydraulic lifting device 48 are reliably connected to the lifting locks 36 on the longitudinal lifting beam 34 via anchors, ensuring the steel strands are perpendicular to the ground during lifting. A trial lift is conducted at the start of the lifting process, using a staged loading method. The mill body 5 and the lifting support structure are monitored during loading; loading can only continue if no abnormalities are found. After the mill body 5 is lifted 100mm, it is suspended. During this suspension, the lifting support structure is inspected and confirmed again. The four sets of hydraulic lifting devices 48 achieve synchronized operation through a synchronous control system. Specifically, a linear system continuously monitors the encoders installed on the steel strands and adjusts the hydraulic pressure of each hydraulic lifting device 48 in real time to ensure that the lifting speed of each steel strand is the same.

[0074] During the lifting process, the verticality of the column 43 and the deflection of the transverse track beam 41 are monitored. The levelness of the mill body 5 is measured in at least two directions to ensure that it is in a horizontal state. In this embodiment, the levelness of the mill body 5 during lifting is controlled at 0.5 mm / m. If the load or height difference at the lifting point exceeds the tolerance, the lifting is immediately adjusted or stopped. Lifting can only be resumed after the obstacles are identified and cleared.

[0075] like Figure 6 , Figure 7 As shown, after the mill body 5 is raised to the predetermined height, the lifting stops. The hydraulic jacking device 49 pushes the sliding beam 44 along the transverse slide rail 42 on the transverse track beam 41, moving the mill body 5 directly above the target installation position A. During the sliding process, a ladder truck is used to assist in tidying up the sliding cable lines to prevent scratches and damage. The pipelines installed during offline commissioning do not need to be removed during the lifting and sliding process.

[0076] After the main body 5 of the rolling mill is slid to a position directly above the target installation location A, four hydraulic lifting devices 48 are controlled to vertically lower the main body 5 into the rolling mill pit, connect it to the pre-installed rolling mill base, and install components such as work rolls and support rolls. After the main body 5 of the rolling mill is in place, the hydraulic lifting devices 48 are unloaded in stages and symmetrically. After unloading, all auxiliary equipment used for rolling mill installation is removed, and the site is cleaned up.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An installation method for moving the main body of a large rolling mill submerged assembly, characterized in that, Includes the following steps: 1) A pre-assembly pit is set up on one side of the target installation position of the rolling mill. The pre-assembly pit is connected to the foundation pit of the roll changing device. The rolling mill components other than the rolling mill base, work rolls and support rolls are assembled in the pre-assembly pit to form the main body of the rolling mill. The transverse center line of the main body of the rolling mill is parallel to the transverse center line of the target installation position. 2) After the main body of the rolling mill is assembled, directly connect the energy pipeline, liquid working medium pipeline and control pipeline of the rolling mill production line to carry out offline commissioning of the rolling mill; 3) A hydraulic jacking and sliding device is installed above the pre-assembly pit to lift the main body of the rolling mill and move the main body of the rolling mill longitudinally so as to adjust the transverse center line of the main body of the rolling mill to be in the same vertical plane as the transverse center line of the target installation position. The hydraulic jacking and sliding device includes longitudinal rail beams, longitudinal slides, sliding shoes, longitudinal lifting beams, transverse lifting beams, and a push-pull drive device. Two longitudinal rail beams are arranged parallel to each other on the ground on both sides of the pre-assembly pit, with the longitudinal center of the mill body as the axis of symmetry. Longitudinal slides are installed on the top of each of the two longitudinal rail beams. Two sets of sliding shoes are installed in each longitudinal slide. One longitudinal lifting beam is installed above each of the two longitudinal rail beams, and the longitudinal lifting beams are supported by jacks on the corresponding two sliding shoes. The transverse lifting beam passes through the window of the mill body, with its bottom surface contacting the top surface of the longitudinal lifting beams, and its top surface contacting the pressing cylinder installed at the upper crossbeam. The mill body is lifted by the synchronous movement of the four sets of sliding shoes. A push-pull drive device is installed on the longitudinal rail beams to push the sliding shoes and the mill body on them to slide along the longitudinal slides on the longitudinal rail beams. 4) Install the mill base on the mill foundation at the target installation position in the mill pit. Set up a hydraulic lifting and sliding device above the mill pit to lift the main body of the mill and slide it laterally to the top of the target installation position. After the main body of the mill is vertically lowered, it is connected to the mill base. After the work rolls and support rolls are installed, the mill is installed in place. The hydraulic lifting and sliding device includes columns, transverse track beams, transverse slides, sliding beams, support frames, hydraulic lifting devices, and hydraulic jacking devices. With the transverse centerline of the target installation position as the axis of symmetry, one row of columns is installed on the ground on both sides of the roll changing device pit. Two transverse track beams are respectively installed on the corresponding columns, with one end extending above the longitudinal track beam and the other end extending above the mill pit. A transverse slide is installed at the top of the transverse track beam, and the lower part of the sliding beam is embedded in and slidably connected to the transverse slide. A support frame is installed on the sliding beam, and four sets of hydraulic lifting devices are installed on the support frame. The hydraulic lifting devices are equipped with vertical steel strands, and the bottom end of the steel strands is equipped with anchors that are connected one-to-one with the lifting locks at the ends of the longitudinal lifting beams. A hydraulic jacking device is installed on the transverse track beam to push the sliding beam, the hydraulic lifting devices on it, and the main body of the mill along the transverse slide on the transverse track beam.

2. The installation method for pushing and moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, In step 1), supports are set up in the pre-assembly pit, and the rolling mill components that make up the main body of the rolling mill are hoisted by the factory crane. During assembly, the rolling mill frame is first installed on the supports, and then the rolling mill frame is connected into a whole by the upper and lower crossbeams.

3. The installation method for moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, Lifting locks are installed at both ends of the longitudinal lifting beam.

4. The installation method for pushing and moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, The push-pull drive device is a push-pull hydraulic cylinder.

5. The installation method for pushing and moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, The support frame consists of longitudinal support beams and transverse support beams; four longitudinal support beams are arranged in parallel and divided into two groups, one group on the outside of the rolling mill body and one group on the inside of the column at both ends of the sliding beam, and each longitudinal support beam spans across two sliding beams; at the top of each group of longitudinal support beams, one transverse support beam is set at each of the corresponding two ends on the outside of the rolling mill body, and the hydraulic lifting device is set on the transverse support beam; the steel strand of the hydraulic lifting device passes downward through the through hole on the transverse support beam, between the two longitudinal support beams in the same group, and between the two sliding beams.

6. The installation method for pushing and moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, The two sliding beams are rigidly connected by a connecting rod.

7. The installation method for moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, The hydraulic lifting device is a cable-type hydraulic lifting device.

8. The installation method for moving the main body of a large rolling mill submerged assembly according to claim 1, characterized in that, The hydraulic jacking device is a jacking hydraulic cylinder.

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