CN112792429B - Large-scale bottom blowing furnace shell coaxiality installation process - Google Patents
Large-scale bottom blowing furnace shell coaxiality installation process Download PDFInfo
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- CN112792429B CN112792429B CN202110010357.8A CN202110010357A CN112792429B CN 112792429 B CN112792429 B CN 112792429B CN 202110010357 A CN202110010357 A CN 202110010357A CN 112792429 B CN112792429 B CN 112792429B
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- 238000007664 blowing Methods 0.000 title claims abstract description 14
- 238000011900 installation process Methods 0.000 title abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 116
- 210000001503 joint Anatomy 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention introduces a furnace shell coaxiality installation process of a large-scale bottom blowing furnace, which comprises the steps of firstly completing the preparation work of an assembly platform; processing weld grooves at the butted ends of the shell cylinder sections of the furnace; and (4) hoisting each shell ring of the furnace shell in sequence, before welding seams at the joints of the shell rings are welded in a field welding operation, detaching the adjusting bolts of the butt joint tools at the welding seams in the shell rings, preheating the welding seams, and performing the field welding operation again. The invention adopts butt joint tools to install on site, thereby greatly reducing the manufacturing cost and improving the efficiency; the mode of interactive installation and assembly is adopted on site, and a medium truck crane is adopted, so that the hoisting cost is greatly reduced; the submerged-arc welding is adopted for on-site welding, so that the welding quality is ensured, the labor intensity of workers is reduced, and the efficiency is improved.
Description
Technical Field
The invention relates to the technical field of large-scale bottom blowing furnace field installation, in particular to a furnace shell coaxiality installation process of a large-scale bottom blowing furnace.
Background
The large-scale oxygen bottom-blown copper smelting technology has the characteristics of high efficiency, energy conservation, environmental protection and comprehensive multi-metal capture, and has wide market prospect. Along with the increase of the productivity and the requirements of energy conservation and environmental protection, the bottom-blowing smelting furnace is developed to be larger and larger, the manufacture of the bottom-blowing furnace with an ultra-large diameter becomes a new subject, and because the diameter of the furnace body is large, the bottom-blowing furnace needs to be manufactured in a factory in a sectional manner and is assembled and welded into a whole on site to solve the transportation problem. The bottom blowing furnace comprises a furnace shell, a fixed end riding wheel, a fixed end rolling ring, a sliding end riding wheel, a sliding end rolling ring, a gear ring transmission device and the like, wherein the gear ring drives the rolling ring to realize the rotation of the furnace shell, the coaxiality of the rolling ring plays a crucial role in the rotation and the reliability of the furnace shell due to the heavy tonnage, the manufacture of the furnace shell of the large-scale bottom blowing furnace requires that the coaxiality of the rolling ring is within 0.25mm, and how to weld and ensure the coaxiality of a rolling ring barrel section on site is a core technology to be solved; the welding seam of the furnace shell is welded by thick plates, and the ultrasonic flaw detection of the welding seam is I grade in GB/T11345, so that the preheating temperature is ensured to be crucial to the welding seam quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a furnace shell coaxiality installation process of a large-sized bottom blowing furnace, ensures the coaxiality of field welding installation of a rolling ring shell ring, and has high installation precision.
The invention adopts the technical scheme that a furnace shell coaxiality installation process of a large-scale bottom blowing furnace comprises the following specific steps:
s1: jacks are arranged at four corners of a supporting steel frame on a welding site, and the rotating tire is hoisted in place by using the jacks to finish the preparation work of an assembly platform;
s2: processing weld grooves at the butted end parts of two end cylindrical sections of the fixed end and the sliding end of the furnace shell, two rolling ring cylindrical sections and three middle cylindrical sections between the two rolling ring cylindrical sections in advance;
s3: hoisting the fixed end part cylindrical shell section to an assembly platform by using a crane, spot-welding inner connecting plates on the inner walls of the two ends of the fixed end part cylindrical shell section, hoisting a fixed end head to the outer side of the fixed end part cylindrical shell section, welding the fixed inner connecting plates after the fixed end head is adjusted in place, assembling and connecting the fixed end part cylindrical shell section and the fixed end head, hoisting a fixed end rolling ring cylindrical shell section, and welding the fixed end part cylindrical shell section inner connecting plates to connect the fixed end part cylindrical shell section and the fixed end rolling ring cylindrical shell section;
s4: turning a crane, and hoisting and connecting the shell sliding end rolling ring cylindrical shell, the sliding end cylindrical shell and the sliding end head to the assembly platform according to the step S3;
s5: moving the crane to the middle position, hoisting three middle cylindrical sections between the two rolling ring cylindrical sections, hoisting two side cylindrical sections firstly, and hoisting the middle cylindrical section;
s6: after each shell section of the furnace shell is hoisted and adjusted to a proper position, 6 on-site welding seams are formed among the shell sections at the two end parts of the furnace shell, the two rolling ring shell sections and the three middle shell sections between the two rolling ring shell sections from left to right, butting tools of snap-and-snap structures are correspondingly arranged on the inner walls of the two rolling ring shell sections and the three shell sections between the two rolling ring shell sections along the circumference, and the positions of the shell sections are pre-adjusted through adjusting bolts of the butting tools; uniformly spot-welding an outer connecting plate on the excircle of each cylindrical shell section, and slowly adjusting the furnace shell in place by taking the position line of the cylindrical shell section backing plate at the sliding end as a reference to firmly weld the outer connecting plate;
s7: detecting the coaxiality of the two rolling ring cylinder sections by using a laser tracker, wherein the coaxiality of the two rolling ring cylinder sections is controlled within 0.1 mm;
s8: before the welding seams at the joints of all the cylinder sections are welded in a field welding operation, firstly, adjusting bolts of a butt joint tool at the inner welding seams of the cylinder sections are dismounted, the welding seams are preheated, three far infrared heating sheets are uniformly placed in the circumferential direction of the inner wall of the cylinder body, then, two inner heating sheets and two outer heating sheets are arranged side by side in a group in the circumferential direction of 1/3 of the outer wall of the cylinder body, 6 heating sheets are totally installed, the outer heating sheets are arranged at a distance of 20-30 mm from the cylinder wall and fixed on a scaffold, the inner welding seams and the outer welding seams of the cylinder body are simultaneously electrified and preheated, the temperature rising speed during preheating is 40 ℃/h, when the temperature of a to-be-welded area of the cylinder body reaches 350 ℃, the heating sheets at the inner side are powered off, and the outer side is still electrified and heated;
s9: from left to right in the field welding operation, firstly welding the 1 st, 3 rd and 5 th field welding seams, then welding the 2 nd, 4 th and 6 th field welding seams, and monitoring the coaxiality in real time in the welding process; during welding, removing the corresponding inner connecting plate or the connecting plate of the butt joint tool, then back chipping the welding seam on the inner side of the cylinder body, welding the welding seam on the inner side, then removing the outer connecting plate, back chipping the welding seam on the outer side of the cylinder body, and welding the welding seam on the outer side after back chipping; and completing the welding operation in sequence.
Specifically, the welding seam groove between each cylinder section is large in inner wall groove and small in outer wall groove.
Specifically, when the heating sheet on the inner side is powered off and the heating sheet on the outer side is still powered on and heated in the welding process, the coal on the lower portion of the cylinder body is heated and the heating sheet on the outer side is heated at the same time, so that the temperature during welding is ensured to be 200 ℃, and the quality of a welding seam is ensured.
Specifically, the field welding adopts submerged-arc welding, and the submerged-arc welding adopts a semi-automatic submerged-arc welding trolley.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the butt joint tools with the snap fastener structures are arranged on the inner walls of the two rolling ring cylinder sections and the three cylinder sections between the two rolling ring cylinder sections, the butt joint tools are adopted for installation on site, compared with a convex-concave flange connection mode, the material consumption of the convex-concave flange and the processing of the male-concave flange snap fastener are reduced, the manufacturing cost can be greatly reduced, and the efficiency is improved.
2. The mode of interactive installation and assembly is adopted on site, and a medium truck crane is adopted, so that the lifting cost is greatly reduced.
3. The submerged-arc welding adopts submerged-arc welding, the submerged-arc welding adopts a semi-automatic submerged-arc welding trolley, and compared with manual welding, the submerged-arc automatic welding can reduce human factors, ensure the welding quality, reduce the labor intensity of workers and improve the efficiency.
Drawings
FIG. 1 is a schematic view of the furnace shell structure of this patent.
Fig. 2 is a schematic view of the distribution of the docking tools inside the shell ring of this patent.
Fig. 3 is a schematic view of the structure of the docking tool inside the shell ring of this patent.
Fig. 4 is a schematic structural view of a weld groove of this patent.
In the figure: 1-fixed end head, 2-fixed end part cylindrical shell, 3-fixed end rolling ring cylindrical shell, 4-middle cylindrical shell, 5-sliding end head, 6-sliding end part cylindrical shell, 7-sliding end rolling ring cylindrical shell, 8-welding seam groove, 9-butt joint tool and 10-adjusting bolt.
Detailed Description
The invention is further explained below with reference to the drawings and examples, without thereby limiting the scope of protection of the invention, which is disclosed with the aim of protecting all technical modifications within the scope of the invention.
The coaxiality installation process of the furnace shell of the large-sized bottom blowing furnace with the combination of the attached drawings 1-4 comprises the following specific steps:
s1: jacks are arranged at four corners of a supporting steel frame on a welding site, and the rotating tire is hoisted in place by using the jacks to finish the preparation work of the assembling platform.
S2: and a welding seam bevel 8 with a large inner wall bevel and a small outer wall bevel is processed at each end part of the butt joint of the two end part cylinder sections of the fixed end and the sliding end of the furnace shell, the two rolling ring cylinder sections and the three middle cylinder sections 4 between the two rolling ring cylinder sections in advance.
S3: utilize the crane to hoist stiff end tip shell ring 2 to the equipment platform on, spot welding inner connecting plate on 2 both ends inner walls of stiff end tip shell ring, hoist stiff end head 1 to the 2 outsides of stiff end tip shell ring, after the adjustment targetting in place, the firm in-connection board of welding is with stiff end tip shell ring 2 and 1 be assembled between/be connected between stiff end head, then hoist stiff end rolling ring shell ring 3, the 2 in-connection boards of welding stiff end tip shell ring are connected stiff end tip shell ring 2 and stiff end rolling ring shell ring 3.
S4: and turning the crane, and hoisting and connecting the sliding end rolling ring shell section 7, the sliding end section shell section 6 and the sliding end seal head 5 of the furnace shell to the assembly platform according to the step S3.
S5: and moving the crane to the middle position, sequentially hoisting the three middle cylindrical sections 4 between the two rolling ring cylindrical sections, hoisting the cylindrical sections at two sides firstly, and hoisting the middle cylindrical section.
S6: after each shell section of the furnace shell is hoisted and adjusted to a proper position, 6 field welding seams are formed between the shell sections at the two end parts of the furnace shell, the two rolling ring shell sections and the three middle shell sections 4 between the two rolling ring shell sections from left to right, butting tools 9 of a snap-fit structure are correspondingly arranged on the inner walls of the two rolling ring shell sections and the three shell sections between the two rolling ring shell sections along the circumference, and the positions of the shell sections are pre-adjusted through adjusting bolts 10 of the butting tools 9; and (3) uniformly spot-welding the outer connecting plates on the excircle of each cylindrical section, and slowly adjusting the furnace shell in place by taking the position line of the cylindrical section backing plate at the sliding end as a reference to firmly weld the outer connecting plates.
S7: and detecting the coaxiality of the two rolling ring cylinder sections by using a laser tracker, wherein the coaxiality of the two rolling ring cylinder sections is controlled within 0.1 mm.
S8: before the welding seams at the joints of all the cylinder sections are welded in a field welding operation, firstly, the adjusting bolts 10 of the butt joint tool 9 at the inner welding seams of the cylinder sections are dismounted, the welding seams are preheated, three far infrared heating sheets are uniformly placed in the circumferential direction of the inner wall of the cylinder body, then, two inner heating sheets and two outer heating sheets are arranged side by side in a group in the circumferential direction of the outer wall 1/3 of the cylinder body, 6 heating sheets are totally installed, the outer heating sheets are 20-30 mm away from the cylinder wall and fixed on a scaffold, the inner welding seams and the outer welding seams of the cylinder body are simultaneously electrified and preheated, the temperature rising speed during preheating is 40 ℃/h, when the temperature of a region to be welded of the cylinder body reaches 350 ℃, the inner heating sheets are powered off, the outer heating sheets are still electrified and heated, coal at the lower part of the cylinder body and the outer heating sheets are simultaneously heated, and the temperature during welding is ensured to be 200 ℃ so as to ensure the quality of the welding seams.
S9: the field welding operation adopts a semi-automatic submerged-arc welding trolley from left to right, firstly welds the 1 st, 3 rd and 5 th field welding seams, then welds the 2 nd, 4 th and 6 th field welding seams, and monitors the coaxiality in real time in the welding process; during welding, removing the corresponding inner connecting plate or the connecting plate of the butt joint tool 9, then back chipping the welding seam on the inner side of the cylinder body, welding the welding seam on the inner side, then removing the outer connecting plate, back chipping the welding seam on the outer side of the cylinder body, and welding the welding seam on the outer side after back chipping; the welding operation is completed in sequence.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (3)
1. The coaxiality mounting process of the furnace shell of the large-sized bottom blowing furnace is characterized by comprising the following specific steps of:
s1: jacks are arranged at four corners of a supporting steel frame on a welding site, and the rotating tire is hoisted in place by using the jacks to finish the preparation work of an assembly platform;
s2: processing weld grooves at the butted end parts of two end cylindrical sections of the fixed end and the sliding end of the furnace shell, two rolling ring cylindrical sections and three middle cylindrical sections between the two rolling ring cylindrical sections in advance; the groove of the welding seam between the sections of each cylinder is large in the inner wall groove and small in the outer wall groove;
s3: hoisting the fixed end part cylindrical shell section to an assembly platform by using a crane, spot-welding inner connecting plates on the inner walls of the two ends of the fixed end part cylindrical shell section, hoisting a fixed end head to the outer side of the fixed end part cylindrical shell section, welding the fixed inner connecting plates after the fixed end head is adjusted in place, assembling and connecting the fixed end part cylindrical shell section and the fixed end head, hoisting a fixed end rolling ring cylindrical shell section, and welding the fixed end part cylindrical shell section inner connecting plates to connect the fixed end part cylindrical shell section and the fixed end rolling ring cylindrical shell section;
s4: turning a crane, and hoisting and connecting a furnace shell sliding end rolling ring cylindrical shell, a sliding end cylindrical shell and a sliding end socket to an assembly platform according to the step S3;
s5: moving the crane to the middle position, hoisting three middle cylindrical sections between the two rolling ring cylindrical sections, hoisting two side cylindrical sections firstly, and hoisting the middle cylindrical section;
s6: after each shell section of the furnace shell is hoisted and adjusted to a proper position, 6 on-site welding seams are formed among the shell sections at the two end parts of the furnace shell, the two rolling ring shell sections and the three middle shell sections between the two rolling ring shell sections from left to right, butting tools of snap-and-snap structures are correspondingly arranged on the inner walls of the two rolling ring shell sections and the three shell sections between the two rolling ring shell sections along the circumference, and the positions of the shell sections are pre-adjusted through adjusting bolts of the butting tools; uniformly spot-welding an outer connecting plate on the excircle of each cylindrical shell section, and slowly adjusting the furnace shell in place by taking the position line of the cylindrical shell section backing plate at the sliding end as a reference to firmly weld the outer connecting plate;
s7: detecting the coaxiality of the two rolling ring cylinder sections by using a laser tracker, wherein the coaxiality of the two rolling ring cylinder sections is controlled within 0.1 mm;
s8: before the welding seams at the joints of all the cylinder sections are welded in a field welding operation, firstly, adjusting bolts of a butt joint tool at the inner welding seams of the cylinder sections are dismounted, the welding seams are preheated, three far infrared heating sheets are uniformly placed in the circumferential direction of the inner wall of the cylinder body, then, two inner heating sheets and two outer heating sheets are arranged side by side in a group in the circumferential direction of 1/3 of the outer wall of the cylinder body, 6 heating sheets are totally installed, the outer heating sheets are arranged at a distance of 20-30 mm from the cylinder wall and fixed on a scaffold, the inner welding seams and the outer welding seams of the cylinder body are simultaneously electrified and preheated, the temperature rising speed during preheating is 40 ℃/h, when the temperature of a to-be-welded area of the cylinder body reaches 350 ℃, the heating sheets at the inner side are powered off, and the outer side is still electrified and heated;
s9: from left to right in the field welding operation, firstly welding the 1 st, 3 rd and 5 th field welding seams, then welding the 2 nd, 4 th and 6 th field welding seams, and monitoring the coaxiality in real time in the welding process; during welding, removing the corresponding inner connecting plate or the connecting plate of the butt joint tool, then back chipping the welding seam on the inner side of the cylinder body, welding the welding seam on the inner side, then removing the outer connecting plate, back chipping the welding seam on the outer side of the cylinder body, and welding the welding seam on the outer side after back chipping; and completing the welding operation in sequence.
2. The process for installing the coaxiality of the furnace shell of the large-sized bottom-blown furnace according to claim 1, wherein the process comprises the following steps: during the welding process, the heating sheets on the inner side are powered off, and when the heating sheets on the outer side are still powered on for heating, the coal on the lower portion of the cylinder body and the heating sheets on the outer side are heated at the same time, so that the temperature during welding is ensured to be 200 ℃, and the quality of a welding seam is ensured.
3. The process for installing the coaxiality of the furnace shell of the large-sized bottom-blown furnace according to claim 1, wherein the process comprises the following steps: the on-site welding adopts submerged-arc welding, and the submerged-arc welding adopts a semi-automatic submerged-arc welding trolley.
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| CN112792429A (en) | 2021-05-14 |
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