A method for on-site slicing and thinning of an ultra-large-diameter arc plate

Abstract

The application discloses a kind of super-large diameter arc plate field piece cutting thin method, first three arc plates are placed in parallel on horizontal ground, with three arc plates in the outermost side of radial as the arc plate to be thinned, with other two arc plates as two arc plates for supporting, operating platform is erected on the radial outside of the arc plate to be thinned, then flexible track is laid on the top of two arc plates for supporting and semi-automatic profiling cutting machine is installed, once thinning forming of the arc plate to be thinned is completed, then thinning of all other arc plates except two arc plates for supporting is completed in turn, finally two arc plates that have been thinned are completed are used to support flexible track and profiling cutting machine, and thinning of two arc plates for supporting is completed.The super-large diameter arc plate field piece cutting thin method is convenient to implement, simple to operate, low in cost and high in efficiency, and has very obvious effect on saving engineering construction cost and improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of processing technology for cylindrical equipment wall panels in petrochemical industry, specifically to a method for on-site thinning of ultra-large diameter arc-shaped plates. Background Technology

[0002] Petrochemical equipment, based on its design and process requirements, is often composed of plates of varying thicknesses. When these plates need to be spliced ​​or joined, if the thickness difference between adjacent joints exceeds the allowable requirements, the thicker plate should be thinned proportionally to meet the design and process requirements.

[0003] There are generally two existing methods for thinning sheet metal. The first method involves first thinning the sheet metal into an arc shape without rolling it on a rolling press, then using milling and planing on the flat sheet, and finally rolling it into an arc shape on a rolling press. This method works well for sheet metal thicknesses above 30mm and where the thinning ratio is no greater than 1:3 (e.g., thinning the thickness by 1mm results in a length thinning of 3mm). However, when the sheet metal thickness is less than 30mm and the thinning ratio is greater than 1:3, this method has disadvantages. Because the sheet metal is thinner and the thinning ratio is larger, when pressing the arc shape on the rolling press, the thinned part is easily flared up during pressing, causing the diameter of the thinned part to increase when the arc shape is joined into a cylinder, making the joining process extremely difficult. The second method involves turning the sheet metal on a lathe. This method is generally used when the arc shape that needs to be thinned is then processed into a cylinder. However, due to limitations in the processing capabilities of existing lathes, this method is only suitable for cylinders with smaller diameters. The two methods mentioned above are not only costly but also inefficient. The first method leads to a significant increase in processing costs and makes matching difficult. The second method is obviously not feasible for thinning cylindrical equipment with a diameter of 70 meters or more, or even larger. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for on-site slicing and thinning of ultra-large diameter arc plates that is convenient to implement, simple to operate, low in cost, and highly efficient, in order to address the shortcomings of the prior art.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: a method for on-site thinning of ultra-large diameter arc-shaped plates, comprising the following steps:

[0006] 1) Prepare multiple curved plates of the same height to be sliced ​​and thinned;

[0007] 2) Place three curved plates side by side on a horizontal surface, with the center line of each curved plate perpendicular to the ground. Leave a certain gap between adjacent curved plates. Use the outermost curved plate in the radial direction as the curved plate to be thinned, and use the other two curved plates as two supporting curved plates.

[0008] 3) An operating platform is set up on the radial outer side of the arc plate to be thinned. The height of the operating platform meets the working needs of the operator when the arc plate is thinned. The location of the arc plate to be thinned is used as the processing station.

[0009] 4) A flexible track is laid on the top of the two supporting arc plates, and a semi-automatic contour cutting machine is installed on the flexible track. The contour cutting machine has a movable cutting head on its arm. The cutting angle of the cutting head is adjustable and the height of the arm is adjustable.

[0010] 5) Adjust the height of the boom of the contour cutting machine and the cutting angle of the cutting head to adjust the thickness and angle of the thinning. Thin the radial outer wall of the upper end of the arc plate to be thinned. During the thinning process, make the contour cutting machine move horizontally and uniformly along the flexible track from one end to the other end in the length direction of the two supporting arc plates to complete the one-time thinning and shaping of the arc plate to be thinned.

[0011] 6) Lift the thinned arc plate away from the processing station, and then place the next arc plate to be thinned on the processing station. Repeat step 5) to complete the thinning and shaping of the arc plate.

[0012] 7) Repeat step 5) to thin all the other curved plates except the two supporting curved plates, and lift the last thinned curved plate away from the processing station.

[0013] 8) Remove the flexible track laid on the top of the two supporting arc plates, then replace the two supporting arc plates with the two thinned arc plates and place them on the ground. Then lay the flexible track on the top of the two thinned arc plates and install the contour cutting machine.

[0014] 9) Place one of the supporting arc-shaped plates as the arc-shaped plate to be thinned at the processing station, repeat step 5), and after the arc-shaped plate is thinned and shaped, lift the arc-shaped plate away from the processing station;

[0015] 10) Place another support arc plate as the arc plate to be thinned at the processing station, and repeat step 5) to complete the thinning and shaping of the arc plate, that is, to complete the on-site slicing and thinning of all arc plates.

[0016] Preferably, the levelness of the ground within any 2-meter interval along the length of the curved plate does not exceed 1.5 mm.

[0017] Preferably, the levelness of the flexible track within any 2 meters along its length does not exceed 1.0 mm, and the three arc-shaped plates placed on the ground are of the same specification, with the top surface of each arc-shaped plate having a levelness of no more than 1.5 mm within any 2 meters along its length, to ensure the stability of the contour cutting machine during horizontal uniform speed movement.

[0018] Compared with existing technologies, this invention has the following advantages: In the on-site slab thinning process, the method of this invention fully utilizes the existing curved plate at the construction site as a support for the contour cutting machine, providing excellent stability and ensuring thinning quality. Furthermore, a simple operating platform is built next to the processing station of the curved plate, significantly reducing construction costs and enabling rapid on-site slab thinning of ultra-large diameter curved plates. This invention's on-site slab thinning method for ultra-large diameter curved plates is convenient to implement, simple to operate, low in cost, and highly efficient, demonstrating a significant effect on saving construction costs and improving construction efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the thinning state in the embodiment;

[0020] Figure 2 for Figure 1 View from direction A.

[0021] The specific reference numerals in the figure are as follows:

[0022] 1-Arc plate, 2-Arc plate, 3-Arc plate, 4-Operating platform, 5-Flexible track, 6-Contouring cutting machine, 61-Arm, 62-Cutting head, 7-Ground, 8-Part to be removed. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] The method for on-site thinning of ultra-large diameter curved plates according to the embodiment includes the following steps:

[0025] 1) Prepare multiple curved plates of the same height to be sliced ​​and thinned. In this embodiment, each curved plate to be sliced ​​and thinned has a thickness of 20mm, a height of 2000mm, a length of 8000mm, a radius of 35000mm, and a thinning ratio of 1:10 (that is, when the thickness is thinned by 1mm, the length is thinned by 10mm). The top surface of each curved plate has a horizontality of no more than 1.5mm between any 2 meters along its length.

[0026] 2) such as Figure 1 and Figure 2As shown, three curved plates (i.e., curved plate 1, curved plate 2 and curved plate 3) are placed side by side on a horizontal ground 7. The levelness of the ground 7 within any 2 meters along the length of the curved plates does not exceed 1.5 mm. The center line of each curved plate is perpendicular to the ground 7. A certain distance is left between two adjacent curved plates. The curved plate 3, which is located on the outermost radial side of the three curved plates, is used as the curved plate to be thinned. Curved plates 1 and 2 are used as two supporting curved plates.

[0027] 3) such as Figure 1 and Figure 2 As shown, an operating platform 4 is erected on the radial outer side of the arc plate to be thinned. The height of the operating platform 4 meets the operating needs of the operator when the arc plate is thinned, and the position of the arc plate to be thinned is used as the processing station.

[0028] 4) such as Figure 1 and Figure 2 As shown, a flexible track 5 is laid on the top of two supporting arc plates. The horizontality of the flexible track 5 within any 2 meters along its length does not exceed 1.0 mm. A semi-automatic contour cutting machine 6 is then installed on the flexible track 5. Both the flexible track 5 and the contour cutting machine 6 adopt existing technology. A movable cutting head 62 is installed on the boom 61 of the contour cutting machine 6. The cutting angle of the cutting head 62 is adjustable, and the height of the boom 61 is adjustable.

[0029] 5) Adjust the height of the boom 61 and the cutting angle of the cutting head 62 of the contour cutting machine 6 to adjust the thickness and angle of the thinning, and thin the radial outer wall of the upper end of the arc plate to be thinned. Figure 2 The black part 8 in the triangle is the part to be removed. During the thinning process, the contour cutting machine 6 moves horizontally and at a constant speed along the flexible track 5 from one end to the other along the length of the two supporting arc plates, completing the thinning and shaping of the arc plate to be thinned in one step.

[0030] 6) Lift the thinned arc plate away from the processing station, and then place the next arc plate to be thinned on the processing station. Repeat step 5) to complete the thinning and shaping of the arc plate.

[0031] 7) Repeat step 5) to thin all the other curved plates except the two supporting curved plates, and lift the last thinned curved plate away from the processing station.

[0032] 8) Remove the flexible track 5 laid on the top of the two supporting arc plates, then replace the two supporting arc plates with the two thinned arc plates and place them on the ground 7. Then lay the flexible track 5 on the top of the two thinned arc plates and install the contour cutting machine 6.

[0033] 9) Place one of the supporting arc-shaped plates as the arc-shaped plate to be thinned at the processing station, repeat step 5), and after the arc-shaped plate is thinned and shaped, lift the arc-shaped plate away from the processing station;

[0034] 10) Place another support arc plate as the arc plate to be thinned at the processing station, and repeat step 5) to complete the thinning and shaping of the arc plate, that is, to complete the on-site slicing and thinning of all arc plates.

Claims

1. A method for on-site thinning of ultra-large diameter arc-shaped plates, characterized in that, Includes the following steps: 1) Prepare multiple curved plates of the same height to be sliced ​​and thinned; 2) Place three curved plates side by side on a horizontal surface, with the center line of each curved plate perpendicular to the ground. Leave a certain gap between adjacent curved plates. Use the outermost curved plate in the radial direction as the curved plate to be thinned, and use the other two curved plates as two supporting curved plates. 3) An operating platform is set up on the radial outer side of the arc plate to be thinned. The height of the operating platform meets the working needs of the operator when the arc plate is thinned. The location of the arc plate to be thinned is used as the processing station. 4) A flexible track is laid on the top of the two supporting arc plates, and a semi-automatic contour cutting machine is installed on the flexible track. The contour cutting machine has a movable cutting head on its arm. The cutting angle of the cutting head is adjustable and the height of the arm is adjustable. 5) Adjust the height of the boom of the contour cutting machine and the cutting angle of the cutting head to adjust the thickness and angle of the thinning. Thin the radial outer wall of the upper end of the arc plate to be thinned. During the thinning process, make the contour cutting machine move horizontally and uniformly along the flexible track from one end to the other end in the length direction of the two supporting arc plates to complete the one-time thinning and shaping of the arc plate to be thinned. 6) Lift the thinned arc plate away from the processing station, and then place the next arc plate to be thinned on the processing station. Repeat step 5) to complete the thinning and shaping of the arc plate. 7) Repeat step 5) to thin all the other curved plates except the two supporting curved plates, and lift the last thinned curved plate away from the processing station. 8) Remove the flexible track laid on the top of the two supporting arc plates, then replace the two supporting arc plates with the two thinned arc plates and place them on the ground. Then lay the flexible track on the top of the two thinned arc plates and install the contour cutting machine. 9) Place one of the supporting arc-shaped plates as the arc-shaped plate to be thinned at the processing station, repeat step 5), and after the arc-shaped plate is thinned and shaped, lift the arc-shaped plate away from the processing station; 10) Place another support arc plate as the arc plate to be thinned at the processing station, and repeat step 5) to complete the thinning and shaping of the arc plate, that is, to complete the on-site slicing and thinning of all arc plates.

2. The method for on-site thinning of ultra-large diameter arc-shaped plates according to claim 1, characterized in that, The levelness of the ground within any 2-meter interval along the length of the curved plate shall not exceed 1.5 mm.

3. The method for on-site thinning of ultra-large diameter arc-shaped plates according to claim 1, characterized in that, The levelness of the flexible track within any 2 meters along its length does not exceed 1.0 mm, and the three arc-shaped plates placed on the ground are of the same size, with the top surface of each arc-shaped plate having a levelness of no more than 1.5 mm within any 2 meters along its length.

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