A welding and reverse heating method for adjusting the wave deformation of steel silo side plate

Abstract

The present invention belongs to the technical field of steel structure manufacturing, and in particular, relates to a welding and reverse heating method for adjusting the wave deformation of the side plate of a steel silo. The method comprises the following steps: (1) Cutting: Cut a number of ribs and angle steels in sequence according to the size requirements and number them for standby; (2) Set up an assembly platform for standby; (3) Assembling: Lay the side plate on the platform, and the longitudinal weld of the upper steel plate of the side plate and the longitudinal weld of the lower steel plate should be staggered by more than 200 mm. Draw lines and mark numbers on the front of the side plate, and spot weld the ribs and angle steels at the corresponding positions of the side plate according to the numbers to complete the assembly; (4) Welding: Use segmented welding to fully weld the welds between the ribs, angle steels, and side plates. The present invention disperses the heat generated during welding through segmented welding to avoid deformation and warping of the side plate caused by heat concentration, and uses crescent heating to utilize the contraction of the heated area to cause local small deformation, flatten the convex surface, and finally achieve the purpose of overall qualification.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure manufacturing, and in particular relates to a welding and reverse heating method for adjusting the wave deformation of a steel silo side plate. Background Art

[0002] Steel silos are a common structural form in the metallurgical industry, such as components commonly used in raw materials, sintering, dust removal and other equipment. The specifications of steel silos include square, rectangular, conical, etc. The steel silo of the flue gas purification system is rectangular, 28380mm long and 3040mm wide. It is assembled as a whole and welded in two sections, with single sections of 13600mm and 14780mm respectively. The thickness of the side plate is 10mm. The outer side of the steel silo side plate is assembled with ribs of varying specifications for reinforcement. There are 6 ribs on the inside, which are basically flat. After welding all the ribs on the outside, due to the longitudinal shrinkage caused by the welding of the ribs, the plate (550mm wide) without ribs at the bottom of the side plate is wavy and deformed, and the unevenness height difference reaches more than 30mm. The flatness designed in the drawing is within ±5mm. If the adjustment does not meet the design requirements, it will cause great difficulties for on-site installation. Summary of the invention

[0003] The object of the present invention is to provide a welding and reverse heating method for adjusting the wave deformation of the side plate of a steel silo, so as to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A welding and reverse heating method for adjusting the wave deformation of a steel silo side plate comprises the following steps:

[0006] (1) Cutting: Cut and number several rib plates and angle steels in sequence according to size requirements;

[0007] (2) Set up the assembly platform for standby use;

[0008] (3) Assembly: Lay the side panels on the platform. The longitudinal welds of the upper and lower steel plates of the side panels should be staggered by more than 200 mm. Mark the lines and numbers on the front of the side panels. Spot weld the ribs and angle steels at the corresponding positions of the side panels according to the numbers to complete the assembly.

[0009] (4) Welding: Use segmented welding to fully weld the welds between the ribs, angle steels, and side plates;

[0010] (5) Deformation adjustment: Use crescent heating to adjust and level the wave deformation at the bottom of the side panel.

[0011] Furthermore, the rib plate includes a plurality of bottom plates, a long horizontal plate, a short horizontal plate, a long vertical plate, a short vertical plate, and a back plate.

[0012] Furthermore, during assembly in step (3), the angle steel is located at the top of the side plate side, the bottom plate is located laterally at the lower position of the side plate side, the short vertical plate is spot welded longitudinally to the bottom plate and the side plate, the long vertical plate is spot welded longitudinally to the angle steel, the bottom plate, and the side plate, the long horizontal plate is spot welded transversely to the side plate and the long vertical plate, and the short horizontal plate is located on both sides of the long vertical plate and spot welded to the long vertical plate and the side plate.

[0013] Furthermore, the welding steps in step (4) are as follows:

[0014] 4.1. Welding of rib plate frame: erect the side plates, weld the welds between the bottom plate and the short vertical plate, weld the welds between the long vertical plate and the short horizontal plates on both sides, weld the welds between the long horizontal plate and the long vertical plate, and weld the welds between the long vertical plate and the angle steel, so that the rib plate and the angle steel form a rib plate frame;

[0015] 4.2. Welding of rib frame and side plate: Weld the welds between the rib frame and the side plate and the welds between the steel plates that make up the side plate;

[0016] 4.3. Welding of the back panel: Weld the back panel to the corresponding position of the side panel.

[0017] Further, the segmented welding method is:

[0018] When welding the rib frame, first weld one of the two welds on both sides of the rib, that is, single-side welding. After all the ribs are welded on one side, weld the other weld in the order of step 4.1.

[0019] When welding on one side, avoid continuous welding of adjacent welds, and separate at least one weld during welding to ensure uniform heat distribution;

[0020] When welding the rib frame and the side panels, the long vertical panels and the long horizontal panels form several squares. Avoid continuous welding of adjacent squares during welding, and weld at least one square apart. When welding the welds within a square, first weld two non-adjacent welds, then weld two non-adjacent welds in other squares. After all squares have two welds, weld the remaining two welds in the square to make the heat evenly distributed.

[0021] Furthermore, the specific method of deformation adjustment in step (5) is: heating the portion of the bottom of the side panel where the ribs are not welded and the wave deformation occurs, the heating area is located in the depression of the wave deformation portion of the side panel, and the shape of the heating area is crescent-shaped.

[0022] Furthermore, the crescent-shaped heating area has an inner radius of 200 mm, an outer radius of 230 mm, and a middle width of 30 mm.

[0023] The present invention has the following beneficial effects:

[0024] The present invention disperses the heat generated during welding by segmented welding, thereby avoiding deformation and warping of the side plate caused by heat concentration. The crescent heating method is used to utilize the contraction of the heated area to cause a small local deformation, flatten the convex surface, and finally achieve the purpose of overall compliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view structural schematic diagram of the side panels and the rib plate frame of the present invention after being assembled.

[0026] Figure 2 It is a side view structural schematic diagram of the side panel and the rib plate frame after being assembled.

[0027] Figure 3 It is a schematic diagram of the longitudinal weld staggered structure when the side panels of the present invention are laid.

[0028] Figure 4 It is a real picture of the wave deformation of the side plate of the present invention.

[0029] Figure 5 It is a physical picture of the heating area during deformation adjustment of the present invention.

[0030] Figure 6 It is a physical picture of the side panel after deformation and adjustment of the present invention.

[0031] Among them: 1. Side plate; 2. Bottom plate; 3. Long horizontal plate; 4. Short horizontal plate; 5. Long vertical plate; 6. Short vertical plate; 7. Back plate; 8. Angle steel; 9. Concave area; 10. Raised surface; 11. Heating area. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The steel silo in this embodiment is rectangular, 28380mm long and 3040mm wide. The two long sides are welded in two sections due to their long length. The single sections are 13600mm and 14780mm respectively. The two wide sides are both 3040m in a single section. When manufacturing the steel silo, the welding and deformation adjustment operations of each single section are completed first, and then the single sections are welded to complete the manufacturing of the steel silo. The present invention provides a welding and reverse heating method for adjusting the wave deformation of the side plate of the steel silo, which is a manufacturing process for a single section of the steel silo. Since the welding of single sections has relatively few welds and small deformation, no deformation adjustment operation is required.

[0034] like Figure 1-6 As shown, a welding and reverse heating method for adjusting the wave deformation of the steel silo side plate includes the following steps:

[0035] (1) Cutting: Cut several ribs and angle steels 8 in sequence according to the size requirements and number them for use. The ribs include the bottom plate 2, the long horizontal plate 3, the short horizontal plate 4, the long vertical plate 5, the short vertical plate 6, and the back plate 7. Since the stress conditions of different parts of the steel silo are different during use, the number of ribs is increased in the parts with greater stress during design.

[0036] (2) Set up the assembly platform for use. The length of the assembly platform is 30,000 mm and the width is 4,000 mm.

[0037] (3) Assembly: Lay the side plate 1 on the platform, and the longitudinal welds of the upper steel plate and the lower steel plate of the side plate 1 should be staggered by more than 200 mm. The side plate 1 is not a whole steel plate, but is composed of several steel plates. The side plate 1 of this embodiment is composed of two layers of steel plates, the weld between the upper and lower layers of steel plates is a transverse weld, and the welds between the steel plates on the same layer are longitudinal welds. Staggering the longitudinal welds before welding can avoid warping and deformation of the plate during the welding process.

[0038] Lines are drawn and numbers are marked on the front of the side panel 1, and the rib plate and angle steel 8 are spot welded at the corresponding positions of the side panel 1 according to the numbers to complete the assembly. During assembly, the angle steel 8 is located at the top of the side of the side panel 1, the bottom plate 2 is located horizontally at the lower position of the side of the side panel 1, the short vertical plate 6 is spot welded longitudinally on the bottom plate 2 and the side panel 1, the long vertical plate 5 is spot welded longitudinally on the angle steel 8, the bottom plate 2, and the side panel 1, the long horizontal plate 3 is spot welded horizontally on the side panel 1 and the long vertical plate 5, and the short horizontal plate 4 is located on both sides of the long vertical plate 5 and spot welded on the long vertical plate 5 and the side panel 1.

[0039] (4) Welding: The welds between the rib plate, angle steel 8 and side plate 1 are fully welded by segmented welding. The welding steps are as follows:

[0040] 4.1. Welding of the rib plate frame: Stand up the side plate 1, weld the weld between the bottom plate 2 and the short vertical plate 6, weld the weld between the long vertical plate 5 and the short horizontal plates 4 on both sides thereof, weld the weld between the long horizontal plate 3 and the long vertical plate 5, and weld the weld between the long vertical plate 5 and the angle steel 8, so that the rib plate and the angle steel 8 form a rib plate frame.

[0041] The segmented welding of the rib frame is as follows: first weld one weld seam on both sides of the rib, that is, single-side welding. After all ribs are welded on one side, weld another weld seam in the order of step 4.1, that is, another weld seam on the other side of the rib. When welding on one side, avoid continuous welding of adjacent welds, and separate at least one weld seam during welding to ensure uniform heat distribution.

[0042] 4.2. Welding of the rib frame and the side panel 1: Weld the welds between the rib frame and the side panel 1 and the welds between the steel plates constituting the side panel 1.

[0043] The segmented welding method of the rib frame and the side plate 1 is as follows: the long vertical plate 5 and the long horizontal plate 3 form a plurality of squares, and when welding, continuous welding of adjacent squares is avoided, and welding is performed at least one square apart. When welding the welds in the square, two non-adjacent welds are welded first, and then two non-adjacent welds in other squares are welded. After two welds are welded in all squares, the remaining two welds in the square are welded, so that the heat is evenly distributed.

[0044] 4.3. Welding of the back panel 7: Weld the back panel 7 to the corresponding position of the side panel 1.

[0045] (5) Deformation adjustment: The wave-shaped deformation at the bottom of the side panel 1 is adjusted and leveled by using a crescent heating method.

[0046] The specific method of deformation adjustment is: heating the part of the bottom of the side plate 1 where the rib plate is not welded and the wave deformation occurs, the heating area 11 is located at the concave part 9 of the wave deformation part of the side plate 1, and the shape of the heating area 11 is crescent-shaped.

[0047] The crescent-shaped heating area 11 has an inner radius of 200 mm, an outer radius of 230 mm and a central width of 30 mm.

[0048] The working principle of the present invention is:

[0049] The heat generated during welding can be dispersed by segmented welding to avoid heat concentration causing deformation and warping of the side plate 1. It should be noted that segmented welding is prone to welding leaks, which requires multiple inspections to prevent welding leaks.

[0050] The reason for the wave deformation is that after the weld between the rib frame and the side panel 1 is welded, the welding of the rib and the side panel 1 produces longitudinal contraction, and the edge of the side panel 1 where there is no welded rib is not constrained, causing it to shorten and wave deformation. The traditional deformation adjustment is to heat the raised surface 10, and the heating shape is triangular, but the thin plate will be more severely deformed by this method. The crescent heating method uses the contraction of the heating area 11 to produce a small local deformation, flatten the raised surface 10, and finally achieve the purpose of overall qualification.

[0051] The above embodiments are only for describing the preferred implementation of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention.

[0052] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A welding and reverse heating method for adjusting the wave deformation of the steel silo side plate, characterized in that: The following steps are involved: (1) Cutting: Cut and number several rib plates and angle steels in sequence according to size requirements; (2) Set up the assembly platform for standby use; (3) Assembly: Lay the side panels on the platform. The longitudinal welds of the upper and lower steel plates of the side panels should be staggered by more than 200 mm. Mark the lines and numbers on the front of the side panels. Spot weld the ribs and angle steels at the corresponding positions of the side panels according to the numbers to complete the assembly. (4) Welding: Use segmented welding to fully weld the welds between the ribs, angle steels, and side plates; (5) Deformation adjustment: Use crescent heating to adjust and level the wave deformation at the bottom of the side panel.

2. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 1 is characterized in that: The rib plate comprises a plurality of bottom plates, a long horizontal plate, a short horizontal plate, a long vertical plate, a short vertical plate and a back plate.

3. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 2 is characterized in that: During the assembly of step (3), the angle steel is located at the top of the side plate side, the bottom plate is located horizontally at the lower position of the side plate side, the short vertical plate is spot welded longitudinally to the bottom plate and the side plate, the long vertical plate is spot welded longitudinally to the angle steel, the bottom plate and the side plate, the long horizontal plate is spot welded transversely to the side plate and the long vertical plate, and the short horizontal plate is located on both sides of the long vertical plate and spot welded to the long vertical plate and the side plate.

4. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 2 is characterized in that: The welding steps in step (4) are as follows: 4.

1. Welding of rib plate frame: erect the side plates, weld the welds between the bottom plate and the short vertical plate, weld the welds between the long vertical plate and the short horizontal plates on both sides, weld the welds between the long horizontal plate and the long vertical plate, and weld the welds between the long vertical plate and the angle steel, so that the rib plate and the angle steel form a rib plate frame; 4.

2. Welding of rib frame and side plate: Weld the welds between the rib frame and the side plate and the welds between the steel plates that make up the side plate; 4.

3. Welding of the back panel: Weld the back panel to the corresponding position of the side panel.

5. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 4 is characterized in that: The segmented welding method is as follows: When welding the rib frame, first weld one of the two welds on both sides of the rib, that is, single-side welding. After all the ribs are welded on one side, weld the other weld in the order of step 4.

1. When welding on one side, avoid continuous welding of adjacent welds, and separate at least one weld during welding to ensure uniform heat distribution; When welding the rib frame and the side panels, the long vertical panels and the long horizontal panels form several squares. Avoid continuous welding of adjacent squares during welding, and weld at least one square apart. When welding the welds within a square, first weld two non-adjacent welds, then weld two non-adjacent welds in other squares. After all squares have two welds, weld the remaining two welds in the square to make the heat evenly distributed.

6. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 1 is characterized in that: The specific method of deformation adjustment in step (5) is: heating the portion of the bottom of the side panel where the ribs are not welded and the wave deformation occurs, the heating area is located in the depression of the wave deformation portion of the side panel, and the shape of the heating area is crescent-shaped.

7. The welding and reverse heating method for adjusting the wave deformation of the steel silo side plate according to claim 5 is characterized in that: The crescent-shaped heating area has an inner radius of 200 mm, an outer radius of 230 mm and a middle width of 30 mm.

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