Installation method for hot continuous rolling mill stand in limited space

Abstract

The invention discloses an installation method for a hot continuous rolling mill rack in a limited space. The installation method comprises the following steps that an unloading carrying pole beam is designed; determining a hoisting method according to calculation; designing a fixed frame body hoisting tool; according to the method, the problems that the hot continuous rolling rack is limited in space and the distance between the racks is small are solved, field continuous installation operation is ensured, and the installation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline installation, and more particularly to a method for installing a hot rolling mill frame in a confined space. Background Art

[0002] In metallurgical engineering projects, the rolling mill stand is the core equipment of the hot rolling project. The roughing and finishing rolling stands are of different sizes. In particular, the finishing rolling is generally a 7-roll rolling mill. The space between the crane and the stand is small, and the stand spacing is small. The conventional double-machine lifting method cannot meet the installation requirements. Therefore, the construction unit pays more attention to it, and the construction unit also attaches great importance to the development of new construction methods.

[0003] In general, the rolling mill frames of metallurgical steel plant production lines are usually hoisted into place by bridge cranes. However, due to the different sizes of roughing mill frames and finishing mill frames, a set of universal unloading and installation lifting equipment needs to be designed, and the situation where the distance between the finishing mill frames is small should be avoided. In the previous implementation process of installing the rolling mill frames, the rotation balancing method is suitable for equipment with large external dimensions, but the rotation balancing method has a complex process, requires many supporting assembly parts, and requires a long time for preliminary preparation and assembly. It also has high requirements for site space and is very time-consuming and labor-intensive. It is not suitable for the installation of hot rolling mill frames. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a method for installing a hot rolling mill frame in a confined space, which solves the problems of confined space and small frame spacing of the hot rolling mill frame, ensures continuous installation operations on site, and improves installation efficiency.

[0005] The present invention adopts the following technical solutions:

[0006] A method for installing a hot rolling mill frame in a confined space comprises the following steps:

[0007] Step 1: Design the unloading pole beam;

[0008] Step 2: Determine the lifting method based on calculation;

[0009] Step 3: Design the fixed frame hoisting tooling;

[0010] Step 4: Determine the installation order and complete the installation.

[0011] Furthermore, in step 1, according to the weight of the rolling mill stand, the weight of a single piece of the roughing mill stand is greater than the weight of a single piece of the finishing mill stand, and the shoulder beam meets the heaviest load.

[0012] Furthermore, the racks include roughing R1 rack, roughing R2 rack, finishing F1-F4 racks, and finishing F5-F7 racks. The heaviest is the roughing R2 rack. The shoulder pole beam meets the load of the roughing R2 rack. The shoulder pole beam is welded from 4 Q345B steel plates.

[0013] Furthermore, in step 2, the clearance between the extreme position of the hook and the +4m platform is 12m, the height of the roughing mill frame is 11080mm, and the height of the finishing mill frame is 10225mm.

[0014] Furthermore, in step three, the fixed frame is composed of two H300×300×15×10 steel sections. There are 11 fixed frames, 10 of which are mainly subjected to tension, and the fixed frames in contact with the frame are subjected to tension and shear forces.

[0015] Furthermore, the fixed frame lifting tooling includes a placement frame, which is horizontally arranged. Lifting rollers are installed on the upper ends of both sides of the placement frame, both ends of the lifting rollers are installed on the lifting mounting plate, the bottom of the lifting mounting plate is installed on the placement frame, and support frames are installed on both sides of the bottom of the placement frame.

[0016] Furthermore, a plurality of partition frames are respectively provided at the upper end and the lower end of the placement rack, the partition frames are located between the two support frames, and the fixed frame is located between the two partition frames.

[0017] Furthermore, the distribution order of the finishing rolling F1-F4 frames and the finishing rolling F5-F7 frames are F1, F2, F3, F4, F5, F6, and F7, and the installation order is F4-F5-F3-F6-F2-F7-F1.

[0018] Beneficial effects

[0019] The present invention adopts a set of unloading tooling and installation tooling to simultaneously meet the rough rolling and finishing rolling unloading installation requirements, and strictly controls the installation sequence, thereby solving the problems of limited space and small frame spacing of the hot rolling mill frame, ensuring continuous installation operations on site, improving installation efficiency, and solving various difficulties encountered in the installation of the rolling mill frame. It can be fully promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a shoulder pole beam according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of a fixed frame hoisting tooling according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the hoisting tooling of a fixed frame according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] As shown in the figure, the present invention discloses a method for installing a hot rolling mill frame in a confined space, comprising the following steps:

[0025] Step 1: Design the unloading pole beam;

[0026] Step 2: Determine the lifting method based on calculation;

[0027] Step 3: Design the fixed frame hoisting tooling;

[0028] Step 4: Determine the installation order and complete the installation.

[0029] In one embodiment of the present invention, in step 1, according to the weight of the rolling mill stand, the weight of a single piece of the roughing mill stand is greater than the weight of a single piece of the finishing mill stand, and the shoulder beam meets the heaviest load.

[0030] In one embodiment of the present invention, the racks include a roughing R1 rack, a roughing R2 rack, a finishing F1-F4 rack, and a finishing F5-F7 rack. The roughing R1 rack has a size of 8655*4170*1800 mm and a unit weight of 129170 kg; the roughing R2 rack has a size of 11080*4320*1660 mm and a unit weight of 176000 kg; the finishing F1-F4 racks have a size of 4390*820*10225 mm and a unit weight of 145000 kg; the finishing F5-F7 racks have a size of 4390*820*9935 mm and a unit weight of 142000 kg. The heaviest is the R2 frame, with a single weight of 176t. According to calculations, the dimensions of the shoulder beam are B=600mm, b=540mm, H=660mm, and h=600mm. It is welded from four pieces of Q345B steel plates with a diameter of t=30mm. Figure 1 The length of the shoulder pole is L=10.3m. According to mechanical calculations, the strength, stiffness and stability of the shoulder pole beam meet the requirements. The heaviest is the rough rolling R2 frame. The shoulder pole beam meets the load of the rough rolling R2 frame. The shoulder pole beam is welded by 4 Q345B steel plates.

[0031] In one embodiment of the present invention, in step 2, the present invention adopts a semi-high equipment foundation design method, the clearance of the large hook limit position from the +4m platform is 12m, the roughing mill frame height is 11080mm, and the finishing mill frame height is 10225mm.

[0032] In one embodiment of the present invention, in step three, the fixed frame is composed of two H300×300×15×10 steel sections, and there are 11 fixed frames, 10 of which are mainly subjected to tension, and the fixed frame in contact with the frame is subjected to tension and shear force.

[0033] In one embodiment of the present invention, the fixed frame lifting tooling includes a placement frame 1, which is horizontally arranged. Lifting rollers 2 are installed on the upper ends of both sides of the placement frame 1, and both ends of the lifting rollers 2 are installed on the lifting mounting plate 3. The bottom of the lifting mounting plate 3 is installed on the placement frame 1, and support frames 4 are installed on both sides of the bottom of the placement frame 1.

[0034] In one embodiment of the present invention, a plurality of partition frames 5 are respectively provided at the upper end and the lower end of the placement rack 1 . The partition frames 5 are located between two support frames 4 , and the fixing frame 6 is located between the two partition frames 4 .

[0035] In one embodiment of the present invention, the distribution order of the finishing rolling F1-F4 frames and the finishing rolling F5-F7 frames is F1, F2, F3, F4, F5, F6, F7, and the installation order is F4-F5-F3-F6-F2-F7-F1.

[0036] Specifically, the distance between the roughing mill R1 and R2 stands is relatively large, so only the height dimensions of the crane and the mill stand need be considered. The roughing mill R2 stand is 11,080mm tall, the distance to the large hook-to-lift roller is 3,500mm, and the distance from the lifting roller to the stand bottom is 9,470mm. The lifting elevation is +4,000mm. The height is calculated as follows: After the mill stand is lifted, the hook head elevation is: 2,700 + 9,470 + 3,500 = 156,070mm. The ultimate hook head elevation is 17,500 - 1,500 = 16,000mm, which meets the lifting requirements. The lower surface elevation of the overhead crane beam is +16,446mm, and the highest lifting point of the R2 stand is +15,080, so there will be no interference (see the detailed dimensions of the R2 dual-machine lifting fixture for details).

[0037] The highest stand of the finishing mill is 10,225mm, smaller than the 11,080mm of the roughing mill R2, so there will be no interference. However, the finishing mill is a 7-roll mill with a small spacing between mills. If the installation sequence is not determined in advance, the spacing in the middle area will not be sufficient to allow the lifting tools of the fixed frame to be lowered. The specific installation sequence is F4-F5-F3-F6-F2-F7-F1, ensuring that one set of tooling can meet the installation of 14 sets of stands in the 7-roll mill, thereby improving installation efficiency.

[0038] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A method for installing a hot rolling mill frame in a confined space, characterized by: The following steps are involved: Step 1: Design the unloading pole beam; Step 2: Determine the lifting method based on calculation; Step 3: Design the fixed frame hoisting tooling; Step 4: Determine the installation order and complete the installation.

2. The method for installing a hot rolling mill frame in a confined space according to claim 1, characterized in that: In step 1, according to the weight of the rolling mill stand, the weight of a single piece of the roughing mill stand is greater than the weight of a single piece of the finishing mill stand, and the shoulder beam meets the heaviest load.

3. The method for installing a hot rolling mill frame in a confined space according to claim 2, characterized in that: The racks include roughing R1 rack, roughing R2 rack, finishing F1-F4 racks, and finishing F5-F7 racks. The heaviest is the roughing R2 rack. The shoulder pole beam meets the load of the roughing R2 rack. The shoulder pole beam is welded from 4 Q345B steel plates.

4. The method for installing a hot rolling mill frame in a confined space according to claim 1, wherein: In step 2, the clearance between the extreme position of the hook and the +4m platform is 12m, the height of the roughing mill stand is 11080mm, and the height of the finishing mill stand is 10225mm.

5. The method for installing a hot rolling mill frame in a confined space according to claim 1, wherein: In step three, the fixed frame is composed of two H300×300×15×10 steel sections. There are 11 fixed frames, 10 of which are mainly subjected to tension, and the fixed frames in contact with the frame are subjected to tension and shear forces.

6. The method for installing a hot rolling mill frame in a confined space according to claim 5, characterized in that: The fixed frame lifting tooling includes a placement frame, which is set horizontally. Lifting rollers are installed on the upper ends of both sides of the placement frame. Both ends of the lifting rollers are installed on the lifting mounting plate. The bottom of the lifting mounting plate is installed on the placement frame, and support frames are installed on both sides of the bottom of the placement frame.

7. The method for installing a hot rolling mill frame in a confined space according to claim 6, characterized in that: The upper end and the lower end of the placement rack are respectively provided with a plurality of partition racks, the partition racks are located between the two supporting racks, and the fixed rack body is located between the two partition racks.

8. The method for installing a hot rolling mill frame in a confined space according to claim 3, characterized in that: The distribution order of the finishing rolling F1-F4 frames and the finishing rolling F5-F7 frames are F1, F2, F3, F4, F5, F6, and F7, and the installation order is F4-F5-F3-F6-F2-F7-F1.

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