A method for installing a large rolling mill by integral jacking and sliding

Abstract

This invention discloses a method for the overall lifting and sliding installation of a large rolling mill, comprising the following steps: S1, dismantling the old rolling mill, modifying the rolling mill foundation, and constructing a pre-assembly position at the foundation of the roll changing device on the rolling mill production line; S2, assembling the rolling mill at the pre-assembly station to form a rolling mill unit; S3, installing the rolling mill sliding lifting device; S4, connecting the rolling mill unit to the rolling mill sliding lifting device, lifting the entire unit, and then sliding it horizontally above the rolling mill installation position; S5, lowering the entire rolling mill unit onto the installation foundation to complete the installation. Because this method uses an offline assembly method, the rolling mill foundation modification is completed simultaneously with the assembly of the rolling mill and the installation of the rolling mill sliding lifting device near the rolling mill production line. The assembled rolling mill is then directly transported to its original position for installation via the rolling mill sliding lifting device, significantly shortening downtime and the downtime modification period.

Description

Technical Field

[0001] This invention relates to a rolling mill installation method, and more particularly to a method for the overall lifting and sliding installation of a large rolling mill for installation and replacement. Background Technology

[0002] In the modernization and renovation of rolling mills, the conventional method for replacing rolling mills is to shut down the rolling line, dismantle the old rolling mill, and assemble the new rolling mill in sections on the foundation. This process has a long renovation cycle, poor site conditions, and great difficulty in hoisting.

[0003] For example, in the "Online Installation Method of Existing Rolling Mill on Rolling Line" with publication number CN103447304A, the rolling mill base is fixed and its upper surface remains horizontal by cooperating with the pusher groove and connecting with the slide rail 5. This provides a good installation foundation for the subsequent installation of the rolling mill frame 1 and other components, enabling online adjustment and alignment of the rolling mill, and improving the accuracy of online installation of the rolling mill. Furthermore, the cooperation between the base and the pusher ensures that the rolling mill can only move in a straight line in one direction during the push process, which can avoid vibration during the push process and prevent changes in the assembly accuracy of the rolling mill during the push process. However, this patent only considers the horizontal movement and does not take into account the issue of hoisting the rolling mill base onto the production line.

[0004] For example, in the "Online Installation Method of an Existing Rolling Mill on an Existing Rolling Line" published in CN103469813B, the process is as follows: First, the complex underground concrete structure of the existing rolling line where the new rolling mill needs to be installed is dismantled online using a dust-free wire saw cutting method. Then, a load-bearing structure with a concave cross-section is cast at the roll changing device of the dismantled section. 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 rolling mill foundation via the moving track. Its disadvantage is that the assembly of the new rolling mill can only be carried out after the original rolling mill has been dismantled, and it still does not consider the vertical hoisting of the rolling mill. Summary of the Invention

[0005] The purpose of this invention is to provide a method for the overall lifting and sliding installation of large rolling mills that effectively shortens downtime, is easy to operate, and has strong adaptability.

[0006] This invention is achieved through the following technical solution: a method for integral lifting and sliding installation of a large rolling mill, comprising the following steps:

[0007] S1, dismantle the old rolling mill, renovate the rolling mill foundation, and construct the pre-assembly position at the foundation of the roll changing device in the rolling mill production line;

[0008] S2, the mill is assembled at the pre-assembly position to form a mill unit;

[0009] S3, Install the mill sliding jacking device, that is, lay at least two parallel track beams from the mill pre-assembly position to the mill foundation position, and set up a hydraulic jacking sliding device above the track beams. The parallel center lines of the two outermost track beams pass through the mill pre-assembly position and the mill foundation position.

[0010] S4 connects the mill unit to the mill sliding jacking device, and after the whole unit is jacked up, it slides horizontally to the position above the mill foundation.

[0011] S5, the entire rolling mill unit is lowered onto the installation foundation to complete the installation.

[0012] Because this solution adopts an offline assembly method for the rolling mill, the assembly of the rolling mill is carried out near the rolling mill production line while the foundation modification of the old rolling mill is completed. After the rolling mill foundation passes inspection, the assembled rolling mill is transported to the rolling mill foundation location for installation using a rolling mill sliding jacking device, which greatly shortens the downtime and production shutdown period. Moving the new rolling mill using the rolling mill sliding jacking device can adapt to installations at different heights, making it more adaptable and safer to operate. It also reduces the difficulty of online hoisting of large rolling mills and improves operational safety. The offline installation method for the new rolling mill does not affect the rolling mill foundation modification construction, realizing parallel construction operations and shortening the construction period. Constructing a pre-assembly pit at the foundation location of the roll changing device can reduce the amount of pre-assembly pit construction work.

[0013] Preferably, the lowest part of the pre-assembly position is an assembly pit below ground level, and the assembly pit is provided with a support for supporting the rolling mill.

[0014] Installing the mill within the assembly pit relies on the lifting function of the mill's sliding jacking device, which improves the stability of the mill installation and reduces the difficulty of installation.

[0015] Preferably, the following steps are also included:

[0016] S6, after installation, remove the mill sliding jacking device.

[0017] When the sliding jacking device of the rolling mill is removed, the new rolling mill can be put into production without affecting the production schedule; at the same time, the removed sliding jacking device can be reused.

[0018] As a preferred option, step S7 is also included, where the pre-assembly location is modified into the foundation of the rolling mill production line roll changing device. Since the foundation of the rolling mill production line roll changing device itself has a pit that is lower than the ground level, the construction difficulty is reduced and the amount of foundation modification work is reduced.

[0019] Preferably, four sets of hydraulic jacking devices are symmetrically arranged on the track beam. Each hydraulic jacking device is equipped with a jacking beam perpendicular to the track beam. The lower part of the jacking beam is connected to a hoisting beam that is perpendicular to the jacking beam and placed horizontally. The hoisting beam passes through the mill window and is used to hoist the mill.

[0020] After the rolling mill is assembled, the lifting beam is inserted into the mill's window. A hydraulic jacking device then raises the lifting beam, which in turn lifts the rolling mill. Once slid to the installation position, the hydraulic jacking device retracts, causing the lifting beam to descend and slowly lower the rolling mill to the installation location, completing the installation. The lifting beam design utilizes the rolling mill's own window, ensuring stable lifting and rapid connection.

[0021] Preferably, the specific operation steps for connecting the rolling mill unit with the rolling mill sliding lifting device in step S4 are as follows:

[0022] S41, insert the hoisting beam through the mill window and place it at the bottom of the mill window, so that the horizontal projection of the center line of the hoisting beam is on the same vertical line as the center line of the mill line.

[0023] S42, connect both ends of the hoisting beam to the lifting beam via fixed slings, and lift the hoisting beam to contact the hydraulic cylinder of the rolling mill via the fixed slings.

[0024] The hoisting beam is set at the mill window to lift the mill, which provides good stability. The mill has a roughly symmetrical structure, so its center of gravity is roughly located at the geometric center. Therefore, the stability requirements are easily met when using the hoisting beam for lifting.

[0025] Preferably, after the overall lifting in step S4, step S43 is also included, in which the two ends of the inclined support structure are fixed to the hydraulic lifting device and the lifting beam respectively, thereby improving the overall stability and safety of the device.

[0026] Preferably, the fixed sling is equipped with a sling tightening device to change the height of the lifting beam. During installation, the lifting beam is raised using the sling tightening device, which reduces the precision requirements when the beam passes through the window and simplifies the operation.

[0027] As a preferred embodiment, the specific operating steps for dismantling the rolling mill sliding jacking device in step S6 are as follows:

[0028] S61, the fixed sling lowers the lifting beam and places it under the mill window, then pulls it out horizontally after separating it from the fixed sling;

[0029] S62, dismantle the lifting beam, hydraulic lifting device and track beam in sequence.

[0030] The fixed slings are easy to remove, and the lifting beam, hydraulic lifting device, and track beam can be reused after removal.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] (1) The method of offline assembly of the rolling mill is adopted. While the old rolling mill foundation is being modified, the rolling mill is offline assembled at the foundation position of the roll changing device in the rolling mill production line. After the rolling mill foundation is accepted, the rolling mill is lifted and slid into place as a whole. This method can significantly shorten the rolling mill modification period, reduce the difficulty of online hoisting of large rolling mills, and improve the safety of operation.

[0033] (2) Constructing a pre-assembly pit at the foundation location of the roll changing device can reduce the amount of pre-assembly pit construction work. After the mill is installed, the foundation of the roll changing device is constructed on the basis of the pre-assembly pit, which reduces the construction difficulty and the amount of foundation modification work.

[0034] (3) The new mill can be moved by the mill sliding jacking device, which can adapt to different installation heights, making it more adaptable and easier to operate;

[0035] (4) The new rolling mill adopts an offline installation method, which does not affect the construction of the rolling mill foundation modification, realizes parallel construction operations, and shortens the construction period. Attached Figure Description

[0036] Figure 1 This is a top view of the layout of Example 1;

[0037] Figure 2 This is a schematic diagram of the pre-assembly of the rolling mill in Example 1;

[0038] Figure 3 for Figure 2 Side view;

[0039] Figure 4 Example 1: Schematic diagram of the overall jacking of the rolling mill;

[0040] Figure 5 for Figure 4 Side view;

[0041] Figure 6 This is a schematic diagram of the overall horizontal sliding of the rolling mill in Example 1;

[0042] Figure 7 for Figure 6 Side view;

[0043] Figure 8 This is a schematic diagram of the overall lowering and positioning of the rolling mill in Example 1;

[0044] Figure 9 for Figure 8 Side view.

[0045] In the diagram: 1. Rolling mill; 101. Hydraulic cylinder; 2. Assembly pit; 21. Support pier; 3. Rolling mill foundation position; 4. Track beam; 5. Lifting beam; 6. Fixed sling; 7. Hydraulic lifting device; 8. Support column; 9. Deflection detector; 10. Adjustable bottom support; 11. Diagonal support; 12. Detailed Implementation

[0046] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this invention is implemented.

[0047] Example 1, as Figure 1-9 As shown, a method for integral lifting and sliding installation of a large rolling mill includes the following steps:

[0048] S1, dismantle the old rolling mill, renovate the rolling mill foundation, and construct the pre-assembly position at the foundation of the roll changing device in the rolling mill production line;

[0049] S2, the mill is assembled at the pre-assembly position to form mill unit 1;

[0050] S3, simultaneously dismantle the old rolling mill and install the rolling mill sliding jacking device. Installing the rolling mill sliding jacking device involves laying two parallel track beams 4 from the pre-assembly position of the rolling mill to the rolling mill foundation position 3. A hydraulic jacking and sliding device is installed above the track beams 4. The parallel center lines of the two outermost track beams 4 pass through the pre-assembly position and the rolling mill foundation position 3.

[0051] S4, connect mill unit 1 to the mill sliding jacking device, and after the whole unit is jacked up, slide horizontally to above mill foundation position 3, specifically including:

[0052] S41, insert the hoisting beam 5 through the mill window and place it at the bottom of the mill window 1, so that the center of the hoisting beam 5 is on the same vertical line as the center line of the mill 1.

[0053] S42, connect both ends of the lifting beam 5 to the lifting beam 6 through fixed slings, and lift the lifting beam 5 to contact the hydraulic cylinder 101 of the rolling mill 1 through fixed slings 7;

[0054] S43, after the whole structure is lifted, fix both ends of the inclined support 12 structure to the hydraulic lifting device and the lifting beam respectively;

[0055] S5, the entire rolling mill unit 1 was lowered onto the installation foundation, completing the installation;

[0056] S6, after installation, remove the mill sliding jacking device;

[0057] S61, the fixed sling 7 lowers the lifting beam 5 and places it under the window of the rolling mill 1, and then pulls it out horizontally after separating from the fixed sling 7;

[0058] S62, dismantle the lifting beam 6, hydraulic lifting device 8 and track beam 4 in sequence;

[0059] S7, the pre-assembly location was transformed into the foundation for the roll changing device of the rolling mill production line.

[0060] Because this solution adopts an offline assembly method for the rolling mill, the old rolling mill foundation is modified while the rolling mill is being assembled near the rolling mill production line. The assembled rolling mill is then directly transported to the final installation position via the rolling mill sliding jacking device, greatly shortening downtime and the downtime for modification. Moving the new rolling mill using the rolling mill sliding jacking device allows it to adapt to installations at different heights, making it more adaptable and safer to operate. The offline installation method for the new rolling mill does not affect the rolling mill foundation modification construction, enabling parallel construction operations and shortening the construction period. At the same time, the dismantled sliding jacking device can be flexibly combined and reused, making it suitable for the overall hoisting of various large rolling mills.

[0061] In addition, the foundation of the rolling mill production line roll changing device near the rolling mill production line was fully utilized. The original pit was used to construct assembly pit 2, which can be easily restored to the foundation of the rolling mill production line roll changing device.

[0062] The lowest part of the pre-assembly position is an assembly pit 2 below ground level, and a support pier 21 is provided within the assembly pit 2 to support the rolling mill 1. Installing the rolling mill within the assembly pit 2, relying on the lifting function of the rolling mill sliding jacking device, improves the stability of the rolling mill installation and reduces the installation difficulty. The support pier 21 reduces the foundation requirements of the assembly pit 2, further shortening the construction period. Furthermore, the assembly pit 2 allows the lower part of the track beam 4 to either not use the support column 9 or have a reduced height, resulting in better stability of the track beam 4.

[0063] Specifically, the mill jacking and sliding device includes four sets of hydraulic jacking devices 8 symmetrically arranged on the track beam 4. Each hydraulic jacking device 8 has two jacking beams 6 perpendicular to the track beam 4. An adjustable bottom support 11 is provided at the bottom of each hydraulic jacking device 8. The hydraulic jacking device 8 can synchronously lift the jacking beams 6. The bottom of each jacking beam 6 is connected to a hoisting beam 5 that is perpendicular to and horizontally placed. The hoisting beam 5 passes through the mill window and is used to lift the mill 1.

[0064] The fixed sling 7 is equipped with a sling tightening device to change the height of the lifting beam 5. The fixed sling 7 is arranged vertically downwards to ensure minimal stress. The length of the lifting beam 5 is greater than the distance between the lifting beams 6. During the installation of the lifting beam 5, the sling tightening device lifts the lifting beam 5, which reduces the precision requirements when the lifting beam 5 passes through the window and simplifies the operation.

[0065] After the rolling mill is assembled, the lifting beam 5 is inserted into the rolling mill's window. Positioned at the window, the lifting beam 5 provides good stability for lifting the mill. Since the rolling mill 1 has a roughly symmetrical structure, its center of gravity is approximately at its geometric center, making it easy to meet stability requirements when using the lifting beam 5. The hydraulic jacking device 8 raises the lifting beam 6, which in turn lifts the lifting beam 5 and raises the rolling mill. After sliding to the installation position, the hydraulic jacking device 8 retracts, causing the lifting beam 6 to descend, slowly lowering the rolling mill to the installation position, completing the installation. The lifting beam 5 utilizes the rolling mill's own window, ensuring stable lifting and rapid connection.

[0066] Furthermore, deflection detectors 10 are installed at the two points on the lifting beam 5 that prevent it from contacting the rolling mill. The lifting process of the rolling mill equipped with deflection detectors 10 is as follows:

[0067] (1) After the hoisting beam 5 is inserted into the window of the rolling mill, ensure that the horizontal projection of the center line of the hoisting beam 5 is on the same vertical line as the center line of the rolling mill.

[0068] (2) After connecting both ends of the hoisting beam 5 to the sling tightening device, slowly start the hydraulic jacking device 8 so that the jacking beam 6 rises to drive the hoisting beam 5 to rise.

[0069] (3) After the mill leaves the foundation, the deflection detector 10 uploads data, compares whether the verticality on the two deflection detectors 10 is within the normal range, and calculates whether the mill's attitude has a dangerous tilt by comparing the difference on the two deflection detectors 10. If both are yes, the mill continues to be raised to the highest point. If no, the mill is slowly lowered and the mill lifting sliding device is checked and adjusted until the position of the hoisting device meets the requirements and the overall level of the mill is stable.

[0070] In addition, deflection detection can be performed on the rolling mill during its sliding transport to the installation position to predict risks at any time.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method of installing a large rolling mill by integral jacking and sliding, characterized in that, The method comprises the following steps: S1, removing the old rolling mill, transforming the rolling mill foundation, and constructing a pre-assembly position at the rolling mill production line roll changing device foundation; S2, assembling the rolling mill at the pre-assembly position to form a rolling mill unit; S3, installing a rolling mill sliding lifting device, i.e. laying at least two parallel track beams from the rolling mill pre-assembly position to the rolling mill foundation position, arranging a hydraulic lifting sliding device above the track beams, and making the parallel center lines of the two outermost track beams pass through the rolling mill pre-assembly position and the rolling mill foundation position; The track beams are provided with a hydraulic lifting device, the hydraulic lifting device is provided with a lifting beam, the lower part of the lifting beam is connected with a hoisting beam, the hoisting beam penetrates the rolling mill window, and deflection detectors are arranged at the two points where the hoisting beam abuts against the rolling mill; S4, connecting the rolling mill unit with the rolling mill sliding lifting device, lifting the whole unit, and sliding horizontally to above the rolling mill foundation position; During the lifting of the rolling mill, the data on the deflection detectors are compared to determine whether the values of the two deflection detectors are within a normal range, and whether the posture of the rolling mill is dangerous to incline by comparing the difference between the values of the two deflection detectors; if both are yes, the rolling mill is continuously lifted to the highest position; if both are no, the rolling mill is lowered, the rolling mill sliding lifting device is checked and adjusted until the requirements are met; S5, lowering the whole rolling mill unit to the installation foundation to complete the installation.

2. The method according to claim 1, characterized in that: The lowermost part of the pre-assembly position is an assembly pit below the ground, and the assembly pit is provided with a support pier for supporting the rolling mill.

3. The method according to claim 1 or 2, characterized in that: The method further comprises the following steps: S6, after the installation is completed, the rolling mill sliding lifting device is removed.

4. The method according to claim 3, characterized in that: The method further comprises the following step S7: transforming the pre-assembly position into the rolling mill production line roll changing device foundation.

5. The method of integrated jacking and sliding installation of a large rolling mill as claimed in claim 1, wherein: Four sets of hydraulic lifting devices are symmetrically arranged on the track beams, the lifting beam is perpendicular to the track beam, and the hoisting beam is perpendicular to and horizontally arranged on the lifting beam.

6. The method according to claim 5, characterized in that: The specific operation steps of connecting the rolling mill unit with the rolling mill sliding lifting device in step S4 are as follows: S41, penetrating the hoisting beam into the rolling mill window from the rolling mill window and placing the hoisting beam at the lower part of the rolling mill window, so that the center line of the hoisting beam is horizontally projected on the same vertical line as the center line of the rolling mill; S42, connecting the two ends of the hoisting beam to the lifting beam through the fixed lifting cable, and lifting the hoisting beam to contact the hydraulic cylinder of the rolling mill through the fixed lifting cable.

7. The method according to claim 6, characterized in that: After the whole unit is lifted in step S4, the step S43 of fixing the two ends of the inclined support structure to the hydraulic lifting device and the lifting beam is further included.

8. The method according to claim 6, characterized in that: The fixed lifting cable is provided with a lifting cable tightening device for changing the height of the hoisting beam.

9. The method according to claim 3, characterized in that: The specific operation steps of removing the rolling mill sliding lifting device in step S6 are as follows: S61, lowering the hoisting beam by the fixed lifting cable and placing the hoisting beam at the lower part of the rolling mill window, and horizontally pulling out after being separated from the fixed lifting cable; S62, sequentially removing the lifting beam, the hydraulic lifting device, and the track beam.

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