Manufacturing process method of flexible leg of gantry crane

Abstract

The invention relates to the technical field of cranes, and discloses a manufacturing process method of a flexible leg of a gantry crane, which comprises the following steps of: manufacturing an upper joint of the flexible leg: assembling and welding a small group in advance, assembling and welding a top plate small group, assembling and welding a barrel body, assembling a peripheral component and assembling a flange component; manufacturing a flange section cylinder body, manufacturing a middle section cylinder body group, and manufacturing a single supporting rod; manufacturing a lower cross beam of the flexible leg: manufacturing small components, manufacturing plane sections, manufacturing box-shaped sections, welding the box-shaped sections, assembling and welding lug plate components, and assembling and welding components with round top and square bottom; and folding in a factory. According to the process, through segmented machining and small-segment manufacturing, the precision of the whole device is improved, meanwhile, the period on a jig frame is shortened, the installation efficiency is high, and the precision is high.

Description

Technical Field

[0001] The present invention relates to the field of cranes, and in particular to a manufacturing process method for flexible legs of a gantry crane. Background Art

[0002] During the manufacturing and installation process of the existing gantry crane flexible legs, the gantry crane flexible legs are usually designed with an A-shaped structure, which has a relatively low rigidity and a large height. The overall installation occupies a large area and is prone to deformation during installation.

[0003] Patent application publication number CN 105236263A discloses a method for installing a flexible leg of a gantry crane. The installation method includes the following steps: dividing the flexible leg of the gantry crane into three parts: an upper joint, two struts, and a lower crossbeam, and connecting the three parts so that they are relatively rotatable; dividing the lower crossbeam into a left section and a right section, and pre-assembling the various parts of the gantry crane flexible leg as a whole on the ground; painting and repairing the assembled gantry crane flexible leg, removing the flange plate process bolts after the repair, and transferring the various components to the installation area; and separately hoisting the lower crossbeam, upper joint, and struts, and installing them in place.

[0004] The overall installation of the prior art occupies a large area and is prone to deformation during installation.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a manufacturing process method for the flexible legs of a gantry crane, which improves the accuracy of the overall device through segmented processing and small-segment production. At the same time, it shortens the cycle on the frame and has high installation efficiency and high precision.

[0007] The technical solution adopted in the present invention is: A manufacturing process for a gantry crane flexible leg comprises the following steps: Step 1: Complete the production of the upper joint of the flexible leg: preliminary small assembly welding, top plate small assembly welding, cylinder assembly welding, peripheral component assembly, flange component assembly; Step 2: Complete the production of the flexible leg struts: the flange section cylinder, the middle section cylinder group, and the single strut; Step 3: Complete the production of the lower crossbeam of the flexible leg: small component production, plane segment production, box segment production, box segment welding, ear plate assembly welding, and round-the-sky-square assembly welding; Step 4: Closing in the factory: marking the ground sample line, preparing the tire frame, positioning the lower beam, positioning the strut, positioning the upper joint, pre-tightening the process bolts at the flange, welding the girth seam at the strut closure, non-destructive testing of the girth seam, installing auxiliary steel, cable tray, completing the size inspection, machining and marking the hinge points, on-site machining of the hinge points, completion inspection, disassembly, rust removal → painting, shipment from the dock, rust removal → painting, shipment from the dock.

[0008] By adopting the above process, through segmented processing and small-segment production, the accuracy of the overall device is improved. At the same time, the cycle on the tire frame is shortened, and the installation efficiency and accuracy are high.

[0009] Preferably, in step 1, the pre-assembly welding includes: assembly welding of the bracket subassembly; welding of the manhole reinforcement ring subassembly; welding of the internal platform subassembly; assembly of the flange and the small section cylinder subassembly; non-destructive testing of the welds between the flange and the small section cylinder; and machining of the flange subassembly.

[0010] Preferably, in step 1, the top plate assembly welding includes: laying the top plate flat on a horizontal tire frame; marking the top plate; assembling the inner cylinder; assembling the inner toggle plate of the inner cylinder; assembling the outer toggle plate of the inner cylinder; and welding the toggle plate and the cylinder.

[0011] Preferably, in step 1, the cylinder assembly and welding includes: assembling the inner middle partition; turning the group over 90 degrees; welding the left and right outer cylinders in advance; closing the left and right outer cylinders to the middle; welding the internal welds; and non-destructive testing of the welds.

[0012] Preferably, in step 1, the peripheral component assembly includes: external panel and base plate assembly; support subassembly assembly; manhole subassembly assembly; welding; and non-destructive testing of welds.

[0013] Preferably, in step 1, the assembly of the flange assembly includes: machining the flange in advance; docking the flange assembly with the cylinder; welding; non-destructive testing of the weld; welding the top ear plate; rust removal → painting; transporting to the flexible leg pre-closing site; and pre-closing the flexible leg as a whole.

[0014] By adopting the above process, the upper joint is manufactured and processed in sections and then assembled into a shape, which can improve the accuracy of each component, install in sections, and have high installation efficiency, thereby improving the qualification rate of the overall equipment.

[0015] Preferably, in step 2, the production of the flange section cylinder includes: blanking → beveling; rolling; welding the internal weld of the longitudinal seam; welding the external weld of the longitudinal seam; passing the non-destructive testing of the longitudinal seam; welding the cylinder flange and a small section of the cylinder; machining the flange surface; and machining the cylinder flange matching holes.

[0016] Preferably, in step 2, the production of the middle section cylinder group includes: first purchasing double longitudinal seam welded pipes; welding the internal ring reinforcement T-rows; welding the internal auxiliary steel; welding the internal electrical brackets, etc.

[0017] Preferably, in step 2, the production of a single strut includes: pre-production of five sections and flange sections of the cylinder at both ends; positioning and pre-closing of the flexible leg flatbed; pre-tightening of process bolts at the flange; circumferential welding of the flange section; overall dimensional inspection; disassembly; rust removal → painting.

[0018] By adopting the above process, the support rods are manufactured and processed in sections and then assembled into shape, which can also improve the accuracy of each component, install in sections, occupy a small area, have high installation efficiency, and improve the qualification rate of the overall equipment.

[0019] Preferably, in step 3, the lower crossbeam manufacturing includes: Step a: Small component production: production of the round top and square bottom; welding of flange and round top and square bottom; machining of flange surface; matching holes for flange; transport to the pre-assembly site; Step b: Plane segment production: plate welding; marking and welding of longitudinal components; non-destructive testing of welds; pyrotechnic correction; plane segment completion inspection; Step c: box body segment production: install internal partition assembly; install end cover plate; install upper and lower flange plate; cover web plate and side plate plane segmentation; box body segment pre-welding inspection; Step d: box section welding; box section welding: internal component welding; box turning 180 degrees; welding after turning; Step e: Lug plate assembly welding: Lug plate assembly advance team; Lug plate assembly installation; Lug plate welding; Horizontal center line marking; Sectional completion inspection; Step f: Assembly and welding of Tianyuanfang components: Tianyuanfang components advance team; assembly and welding at the manhole; completion inspection; marking of horizontal center line; waiting for closure.

[0020] By adopting the above process, the equipment installation cycle is short, the installation efficiency is high, the precision is high, and the segmented installation facilitates the improvement of the preparation precision and the high pass rate.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The process of the present invention improves the accuracy of the overall device through segmented processing and small-segment production. At the same time, it shortens the cycle on the tire frame, and has high installation efficiency and high precision.

[0022] 2. The process equipment of the present invention is installed in sections, and the flange surface is processed in small sections in stages, which can improve the installation accuracy of the device and increase the qualified rate of the device after installation.

[0023] 3. The components of the process of the present invention are manufactured and processed in sections and then assembled into a shape, which can improve the accuracy of each component, install in sections, occupy a small area, have high installation efficiency, and improve the qualification rate of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the flexible leg of the present invention; Figure 2 Schematic diagram of the bracket assembly of the present invention; Figure 3 Schematic diagram of the manhole reinforcement ring of the present invention; Figure 4 is a schematic diagram of the flange of the present invention; Figure 5 is a schematic diagram of the top plate of the present invention; Figure 6 It is a schematic diagram of the cylinder welding of the present invention; Figure 7 It is a schematic diagram of the cylinder welding of the present invention; Figure 8 It is a schematic diagram of the cylinder welding of the present invention; Figure 9 A schematic diagram of the assembly of peripheral components of the present invention; Figure 10 A schematic diagram of the assembly of peripheral components of the present invention; Figure 11 A schematic diagram of the assembly of peripheral components of the present invention; Figure 12 A schematic diagram of the brace produced according to the present invention; Figure 13 A schematic diagram of the present invention showing a round sky and square earth; Figure 14 A schematic diagram of a puzzle board according to the present invention; Figure 15 This is a schematic diagram of the box body of the present invention being manufactured in sections; Figure 16 This is a schematic diagram of the box body of the present invention being manufactured in sections; Figure 17 is a schematic diagram of the ear plate assembly of the present invention; Figure 18 Schematic diagram of the lower crossbeam of the present invention.

[0025] Among them: 1. Upper joint; 2. Strut; 3. Lower crossbeam; 4. Toggle plate subassembly; 5. Manhole reinforcement ring; 6. Flange; 7. Top plate; 8. Inner cylinder; 9. Toggle plate; 10. Inner middle partition; 11. Cylinder; 12. External plate; 13. Support subassembly; 14. Manhole subassembly; 15. A small section of cylinder; 16. Cylinder flange; 17. The sky is round and the earth is square; 18. Panel; 19. Box; 20. Ear plate assembly. DETAILED DESCRIPTION

[0026] like Figure 1-18 As shown, a manufacturing process method for a gantry crane flexible leg includes the following steps: Step 1: Complete the production of the upper joint 1 of the flexible leg: preliminary small assembly welding, top plate small assembly welding, cylinder assembly welding, peripheral component assembly, peripheral component assembly; Step 2: Complete the production of the flexible leg strut 2: the flange section cylinder, the middle section cylinder group, and the single strut; Step 3: Complete the production of the lower crossbeam 3 of the flexible leg: small component production, plane segment production, box segment production, box segment welding, ear plate assembly welding, and round-the-sky-square assembly welding; Step 4: Closing in the factory: marking the ground sample line, preparing the tire frame, positioning the lower beam, positioning the strut, positioning the upper joint, pre-tightening the process bolts at the flange, welding the girth seam at the strut closure, non-destructive testing of the girth seam, installing auxiliary steel, cable tray, completing the size inspection, machining and marking the hinge points, on-site machining of the hinge points, completion inspection, disassembly, rust removal → painting, shipment from the dock, rust removal → painting, shipment from the dock.

[0027] In step 1, the preliminary small assembly welding includes: assembly and welding of the bracket small assembly 4; welding of the manhole reinforcement ring 5 group; welding of the internal platform group; assembly of the flange 6 and the small section cylinder group; non-destructive testing of the flange and the small section cylinder weld; and machining of the flange small assembly.

[0028] In step 1, the top plate assembly welding includes: laying the top plate 7 flat on the horizontal tire frame; marking the top plate; assembling the inner cylinder 8; assembling the inner toggle plate 9 of the inner cylinder; assembling the outer toggle plate of the inner cylinder; and welding the toggle plate and the cylinder.

[0029] In step 1, the cylinder assembly and welding includes: assembling the inner middle partition 10; turning the group over 90 degrees; welding the left and right outer cylinders 11 in advance; closing the left and right outer cylinders 11 to the middle; welding the internal welds; and non-destructive testing of the welds.

[0030] In step 1, the peripheral component assembly includes: external mounting plate 12 and base plate assembly; support subassembly 13 assembly; manhole subassembly 14 assembly; welding; and non-destructive testing of welds.

[0031] In step 1, the flange assembly assembly includes: pre-machining of the flange 6; docking of the flange assembly with the cylinder 11; welding; non-destructive testing of the weld; welding of the top ear plate; rust removal → painting; transport to the flexible leg pre-closing site; and pre-closing of the flexible leg as a whole.

[0032] In step 2, the production of the flange section cylinder includes: cutting → beveling; rolling; welding the internal weld of the longitudinal seam; welding the external weld of the longitudinal seam; passing the non-destructive testing of the longitudinal seam; welding the cylinder flange 16 and a small section of the cylinder 15; machining the flange surface; and processing the holes of the cylinder flange 16.

[0033] In step 2, the production of the middle section cylinder group includes: first purchasing double longitudinal seam welded pipes; internal ring reinforcement T-row welding; internal auxiliary steel welding; internal electrical bracket welding, etc.

[0034] In step 2, the production of a single strut includes: pre-production of five sections and 16 sections of cylinder flanges at both ends; positioning and pre-closing of the flexible leg flatbed; pre-tightening of process bolts at the flange; circumferential welding of the flange section; overall dimensional inspection; disassembly; rust removal → painting.

[0035] In step 3, the lower beam production includes: Step a: Small component production: production of Tianyuandifang 17; welding of flange and Tianyuandifang 17; machining of flange surface; matching holes for flange; transport to pre-assembly site; Step b: Plane segment production: welding of panels 18; marking and welding of longitudinal components; non-destructive testing of welds; pyrotechnic correction; completion inspection of planar segments; Step c: Fabrication of box 19 sections: Installing internal partition assembly; Installing end closures; Installing upper and lower flange plates; Covering web (side) plane sections; Inspection of box 19 sections before welding; Step d: welding the box body 19 in sections; welding the box sections: welding the internal components; turning the box body 180 degrees; welding after turning; Step e: Assembly and welding of the ear plate assembly 20: ear plate assembly advance group; ear plate assembly 20 installation; ear plate welding; horizontal center line marking; segmented completion inspection; Step f: Assembly and welding of Tianyuanfang 19 components: Tianyuanfang component advance team; assembly and welding at the manhole; completion inspection; marking of horizontal center line; waiting for closure.

[0036] This process improves overall assembly precision through segmented processing and small-scale fabrication, while also shortening the cycle time on the tire frame and achieving high installation efficiency and precision. The segmented installation of equipment and the phased processing of small flange surfaces improves assembly precision and increases the qualified rate of the installed equipment. The segmented fabrication and assembly of components improves the precision of each component. Segmented installation facilitates transportation, reduces floor space, improves precision control, and increases installation efficiency, thereby improving the qualified rate of the overall equipment.

[0037] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should be included in the scope of protection determined by the claims of the present invention.

Claims

1. A manufacturing process for a gantry crane flexible leg, characterized by: The following steps are involved: Step 1: Complete the production of the upper joint of the flexible leg: preliminary small assembly welding, top plate small assembly welding, cylinder assembly welding, peripheral component assembly, flange component assembly; Step 2: Complete the production of the flexible leg struts: the flange section cylinder, the middle section cylinder group, and the single strut; Step 3: Complete the production of the lower crossbeam of the flexible leg: small component production, plane segment production, box segment production, box segment welding, ear plate assembly welding, and round-the-sky-square assembly welding; Step 4: Closing in the factory: marking the ground sample line, preparing the tire frame, positioning the lower beam, positioning the strut, positioning the upper joint, pre-tightening the process bolts at the flange, welding the girth seam at the strut closure, non-destructive testing of the girth seam, installing auxiliary steel, cable tray, completing the size inspection, machining and marking the hinge points, on-site machining of the hinge points, completion inspection, disassembly, rust removal → painting, shipment from the dock, rust removal → painting, shipment from the dock.

2. The manufacturing process of a gantry crane flexible leg according to claim 1, characterized in that: In the step 1, the preliminary small assembly welding includes: assembly welding of the bracket small assembly; welding of the manhole reinforcement ring group; welding of the internal platform group; assembly of the flange and small section cylinder group; non-destructive testing of the flange and small section cylinder welds; and machining of the flange small assembly.

3. The manufacturing process of the flexible leg of a gantry crane according to claim 1, characterized in that: In step 1, the top plate assembly and welding includes: laying the top plate flat on a horizontal tire frame; marking the top plate; assembling the inner cylinder; assembling the inner bracket of the inner cylinder; assembling the outer bracket of the inner cylinder; and welding the bracket and the cylinder.

4. The manufacturing process of a gantry crane flexible leg according to claim 1, characterized in that: In step 1, the cylinder assembly and welding includes: assembling the inner middle partition; turning the group 90 degrees; welding the left and right outer cylinders in advance; closing the left and right outer cylinders towards the middle; welding the internal welds; and non-destructive testing of the welds.

5. The manufacturing process of the flexible leg of a gantry crane according to claim 1, characterized in that: In step 1, the peripheral component assembly includes: external panel and base plate assembly; support subassembly assembly; manhole subassembly assembly; welding; and non-destructive testing of welds.

6. The manufacturing process of a gantry crane flexible leg according to claim 1, characterized in that: In step 1, the assembly of the flange assembly includes: pre-machining of the flange; docking of the flange assembly with the cylinder; welding; non-destructive testing of the weld; welding of the top ear plate; rust removal → painting; transport to the flexible leg pre-closing site; and pre-closing of the flexible leg as a whole.

7. The manufacturing process of a gantry crane flexible leg according to claim 1, characterized in that: In step 2, the production of the flange section cylinder includes: cutting → beveling; rolling; welding the internal longitudinal seam; welding the external longitudinal seam; passing the non-destructive testing of the longitudinal seam; welding the cylinder flange and a small section of the cylinder; machining the flange surface; and machining the cylinder flange matching holes.

8. The manufacturing process of a gantry crane flexible leg according to claim 1, characterized in that: In step 2, the production of the middle section cylinder group includes: first purchasing double longitudinal seam welded pipes; welding the internal ring reinforcement T-rows; welding the internal auxiliary steel; welding the internal electrical brackets, etc.

9. The manufacturing process of the flexible leg of a gantry crane according to claim 1, characterized in that: In step 2, the production of a single strut includes: pre-production of five sections and flange sections at both ends; positioning and pre-closing of the flexible leg flatbed; pre-tightening of process bolts at the flange; circumferential welding of the flange sections; overall dimensional inspection; disassembly; rust removal → painting.

10. The manufacturing process of the flexible leg of a gantry crane according to claim 1, characterized in that: In step 3, the lower crossbeam production includes: Step a: Small component production: production of the round top and square bottom; welding of flange and round top and square bottom; machining of flange surface; matching holes for flange; transport to the pre-assembly site; Step b: Plane segment production: plate welding; marking and welding of longitudinal components; non-destructive testing of welds; pyrotechnic correction; plane segment completion inspection; Step c: box body segment production: install internal partition assembly; install end closure plate; install upper and lower flange plate; cover web plate and side plate plane segmentation; box body segment pre-welding inspection; Step d: box section welding; box section welding: internal component welding; box turning 180 degrees; welding after turning; Step e: Lug plate assembly welding: Lug plate assembly advance team; Lug plate assembly installation; Lug plate welding; Horizontal center line marking; Sectional completion inspection; Step f: Assembly and welding of Tianyuanfang components: Tianyuanfang components advance team; assembly and welding at the manhole; completion inspection; marking of horizontal center line; waiting for closure.

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