Manufacturing process for tower body structure of herringbone tower of electric crane

Abstract

The invention relates to a manufacturing process for a tower body structure of a herringbone tower of an electric crane, which comprises the following steps: firstly, respectively manufacturing an upper cylinder and a lower cylinder; the lower cylinder bodies are hoisted to a jig frame, the lower cylinder bodies are pre-spliced in place, after the lower cylinder bodies and the lower cylinder bodies are spliced in place, process clamps are welded to the connecting positions of the lower cylinder bodies and the upper cylinder bodies, and then the overall horizontal height of the upper cylinder bodies and the lower cylinder bodies is adjusted; scribing is conducted on the upper cylinder and the lower cylinder, and all welding work is completed; and after scribing is finished, remeasuring and confirming that the positions of all the processing lines are within a reasonable deviation range, and after each processing surface can be processed, separating the upper cylinder body from the lower cylinder body to finish manufacturing of the upper cylinder body and the lower cylinder body. According to the manufacturing process, the tower body of the herringbone tower is divided into two large sections, namely the upper barrel and the lower barrel, then the upper barrel and the lower barrel are manufactured respectively, finally pre-assembly is conducted, and it is guaranteed that the manufactured section precision meets the manufacturing requirement and the subsequent welding process requirement in a lineation mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of crane preparation, in particular to a manufacturing process of an electric crane pyramid tower body structure. BACKGROUND

[0002] Electric cranes are widely used in offshore engineering equipment such as self-elevating drilling platforms, self-elevating work platforms, drilling ships, and offshore engineering installation ships. An electric crane is composed of a cylindrical base, a herringbone frame, and an arm frame. The base is fixed to the structure of a ship or platform. Since the electric crane needs to be used in a marine environment, the main equipment of the electric crane is placed inside the body as much as possible to prevent corrosion from the marine environment. On offshore engineering equipment, the space and weight occupied by the electric crane are required to be high, and the electric crane is required to have a small tail rotation space, resulting in a compact design structure of the electric crane, which brings higher requirements for manufacturing and installation.

[0003] The herringbone frame of the electric crane is large in size and heavy in weight. When the herringbone frame component is prepared, the entire herringbone frame is divided into multiple segments for independent preparation, and finally assembled. This requires high machining precision for each segment, otherwise the final assembly cannot be completed smoothly. In addition, lifting and other operations are required during assembly. Before lifting, lifting lugs need to be welded on the component, which results in a large number of lifting lugs. After assembly, the unnecessary lifting lugs need to be cut and trimmed, which is very troublesome. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an electric crane herringbone pyramid tower body structure manufacturing process that facilitates herringbone tower body manufacturing.

[0005] To solve the above technical problems, the technical solution of the present application is as follows: an electric crane herringbone pyramid tower body structure manufacturing process, the herringbone pyramid tower body structure includes an upper cylinder and a lower cylinder, the upper cylinder includes an upper cylinder body, a pulley bracket, and an upper anchoring assembly, the pulley bracket is installed on the upper end face of the upper cylinder body, and a pulley hole is opened in the pulley bracket, a heavy plate is arranged at each pulley hole, and the upper anchoring assembly is arranged beside the pulley bracket, an inner hole is opened in the upper anchoring assembly, the lower cylinder includes a lower cylinder body and a flange plate, an arm frame fixing hinge shaft hole is opened in the lower cylinder body, a heavy plate is arranged at each arm frame fixing hinge shaft hole, and the bottom end face of the lower cylinder body is connected with the flange plate, and the innovation point is that the manufacturing process includes the following steps: S1: first, the upper cylinder and the lower cylinder are prepared respectively, then the jig of the pre-assembled lower cylinder is raised and reinforced, and the flatness of the splicing port of the upper cylinder and the lower cylinder is checked to see whether it meets the requirements, and if there is an error, the error is adjusted to the right by cutting and trimming first; S2: hoist the lower cylinder to the tire frame, adjust the state of the lower cylinder, pre-assemble the lower cylinder and the lower cylinder, after assembling in place, place the lower cylinder on the tire frame, and weld the process card at the connection between the lower cylinder and the upper cylinder, then adjust the overall level of the upper cylinder and the lower cylinder; S3: draw a line on the upper cylinder and the lower cylinder, first draw the center reference line of the front and side, then according to the center reference line, weld the upper anchor assembly in place, and install and position the un-welded mechanical, electrical and hydraulic pre-welding parts on the upper cylinder and the lower cylinder, and complete the welding work; S4: draw the flange plate lower surface and outer circle processing line, arm support fixed hinge shaft hole and heavy plate surface, top pulley hole and heavy plate surface, upper anchor assembly inner hole and mounting surface machining line respectively with the center reference line as the reference; S5: after the line drawing is completed, re-measure and confirm that all processing lines are within a reasonable deviation range, and each processing surface can be processed, then separate the upper cylinder and the lower cylinder, and complete the production of the upper cylinder and the lower cylinder.

[0006] Further, the preparation of the upper cylinder comprises the following steps: First, prepare the pulley support; Two plates are spliced into a partition plate for being arranged between the pulley support and the upper cylinder body, then the partition plate is placed on a flat tire frame, a center line and an installation line of the pulley support main plate are drawn on the surface of the partition plate, the upper cylinder body top sealing plate and each main plate, connecting plate and partition plate constituting the pulley support are assembled into a whole pulley support, at this time each plate is not welded, after adjusting the opening of each main plate and the positioning size meets the requirements, each plate is fixed by spot welding, and the upper part of each main plate of the pulley support is fixed by using the welding process support, finally each heavy plate is welded to the corresponding main plate according to the requirements, and the production of the pulley support is completed; Then, prepare the upper cylinder body; The face plate and web plate constituting the upper cylinder body are lofted and cut, and the lower end of the face plate and the web plate is not placed with a cutting allowance, but only with a welding shrinkage allowance, and the upper and lower ends of each side of the upper cylinder body need to be ensured to be flush and the overall flatness needs to be ensured during production; After the upper cylinder body is produced, the main plate of the pulley support is installed in place and fixed by spot welding, and the remaining parts of the pulley support are not installed, after the pulley support is installed in place, each part is installed in place, and it is noted that the opening between the main plates meets the requirements; The upper anchor assembly is not installed first, and after the upper cylinder and the lower cylinder are pre-assembled and drawn, the upper anchor assembly is welded in place; Finally, the lifting lugs are welded on the pulley support and the upper cylinder body.

[0007] Further, each heavy plate on the pulley support is reserved with a machining allowance of 3-4 mm in thickness during machining.

[0008] Further, the upper cylinder body is not welded at the lower end of the panel and web of the upper cylinder body body during preparation, and is welded after being folded in place during the assembly of the upper cylinder and the lower cylinder.

[0009] Further, the preparation of the lower cylinder body comprises the following steps: First, the preparation of the lower cylinder body is prepared; The lower cylinder body is divided into four segments, and the segmented blanking is performed, and the four segments are defined as the first segment, the second segment, the third segment and the fourth segment, wherein the two sides of the first segment and the second segment are provided with a bending section, and the third segment and the fourth segment are both flat plates. Take a steel plate corresponding to the size of the first segment and the second segment, and bend it according to the blueprint, and then take two steel plates as the third segment and the fourth segment, and assemble the first segment, the second segment, the third segment and the fourth segment to form the lower cylinder body. Then, the preparation of the flange plate is prepared; The flange plate is divided into even segments and segmented blanking, and the joint of each segment is in the middle of the two bolt holes, and each joint is provided with a welding shrinkage allowance. After segmented blanking, the butt welding groove at both ends of the joint is opened on each segment, and then each segment is spliced and welded on the splicing process platform to form the flange plate. The prepared flange plate is assembled with the lower cylinder body; Finally, the lug is welded on the lower cylinder body.

[0010] Further, the first segment and the second segment need to be cleaned before bending, and the free edge of the bending needs to be polished smooth. After bending, the bending arc part and the side edge are visually detected, MT detected, plate thickness and outer dimension detected, and the excess amount on both sides of the upper end of the bending part is marked and cut off after bending.

[0011] Further, before assembling, the lower cylinder body is first placed on a flat ground or thick steel plate as a base for cylinder assembly, then the inner and outer installation lines, cross center line and rotation center line of the lower cylinder body are drawn on the ground or thick steel plate, the first segment and the second segment are hoisted into position, the bottom of the first segment and the second segment is aligned with the inner installation line, the inner installation process diagonal brace is installed, and the anti-overturning treatment is completed, then the third segment and the fourth segment are hoisted into position respectively, the bottom of the third segment and the fourth segment is aligned with the inner installation line, the two sides are assembled into position with the first segment and the second segment, and then the outer installation process diagonal brace is installed, and the anti-overturning treatment is completed, after the lower cylinder body is formed, the outer shape size and the upper and lower opening gap size of the lower cylinder body are detected to ensure that they meet the blueprint and process requirements.

[0012] The advantage of the present application is that the manufacturing process of the present application divides the pyramid body into an upper cylinder and a lower cylinder, then separately manufactures the upper cylinder and the lower cylinder, finally pre-assembles, and ensures that the manufacturing segment accuracy meets the manufacturing requirements and subsequent welding process requirements through the marking line method, so as to ensure the machining accuracy of the whole pyramid body, and the two segments are used for manufacturing, so that the number of welding, splicing and lifting lugs is greatly reduced, and the machining of the pyramid body structure is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the electric crane pyramid body structure of the present application.

[0014] Figure 2 It is a side view of the electric crane pyramid body structure of the present application.

[0015] Figure 3 It is a pre-assembled state view of the upper cylinder and the lower cylinder in the present application.

[0016] Figure 4 It is a schematic view of the first segment in the present application.

[0017] Figure 5 It is a schematic view of the third segment in the present application. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purposes, the specific embodiments, structures, features and effects of the present application are described in detail below in combination with the drawings and preferred embodiments.

[0019] As Figure 1 , Figure 2The illustrated one kind of pyramid tower structure includes upper cylinder and lower cylinder, the upper cylinder includes upper cylinder main body 1, pulley support 2 and upper anchoring assembly 5, pulley support 2 is installed on the upper end surface of upper cylinder main body 1, and pulley hole is opened in pulley support 2, each pulley hole is also provided with heavy pound plate, upper anchoring assembly 5 is arranged at the side of pulley support 2, inner hole is opened in upper anchoring assembly 5, lower cylinder includes lower cylinder main body 2 and flange plate 4, arm support fixed hinge shaft hole is also opened in lower cylinder main body 2, arm support fixed hinge shaft hole has two in total and is opened in an arm support fixed seat 41 respectively, two arm support fixed seats 41 are located at the two sides of lower cylinder main body 2 respectively, and two arm support fixed seats 41 are fixed with flange plate 4, heavy pound plate is also arranged at each arm support fixed hinge shaft hole, the bottom end surface of lower cylinder main body 2 is connected with flange plate 4.

[0020] The manufacturing process of the electric crane pyramid tower structure of the application is realized by the following steps: S1: first, the upper cylinder and the lower cylinder are prepared respectively, then the jig 6 of the pre-assembled lower cylinder is heightened and reinforced, and whether the flatness of the splicing port of the upper cylinder and the lower cylinder meets the requirements is checked, if there is an error, it is adjusted to the right by cutting.

[0021] S2: the lower cylinder is hoisted to the jig 6, and the state of the lower cylinder is adjusted, the lower cylinder is pre-assembled with the lower cylinder, as shown in the figure, Figure 3 After assembling in place, the lower cylinder is placed on the jig 6, and a welding process card is installed at the connection between the lower cylinder and the upper cylinder, and the overall horizontal height of the upper cylinder and the lower cylinder is adjusted.

[0022] S3: the upper cylinder and the lower cylinder are marked, the center reference line of the front and the side is first drawn, then the upper anchoring assembly 5 is installed and welded in place according to the center reference line, and the machine, electric and hydraulic pre-welding parts on the upper cylinder and the lower cylinder are installed, positioned and welded, and all welding work is completed.

[0023] S4: the machining lines of the lower surface of the flange plate and the outer circle, the arm support fixed hinge shaft hole and the heavy pound plate face, the top pulley hole and the heavy pound plate face, the upper anchoring assembly inner hole and the mounting surface are respectively drawn with the center reference line as the reference; S5: after the marking is finished, all the machining line positions are re-measured and confirmed to be within a reasonable deviation range, each machining surface can be machined, then the upper cylinder and the lower cylinder are separated, and the manufacturing of the upper cylinder and the lower cylinder is completed.

[0024] Specifically, the preparation of the upper cylinder includes the following steps: First, prepare the pulley support 3: Two plates are spliced into a partition plate for being arranged between the pulley support and the upper cylinder body, then the partition plate is placed on a flat tire frame, a center line and an installation line of the main plate of the pulley support are drawn on the surface of the partition plate, the sealing plate at the top of the upper cylinder body and each main plate, connecting plate and partition plate constituting the pulley support are assembled into the pulley support as a whole, at this time, each plate is not welded, after the gap between each main plate is adjusted and each positioning dimension meets the requirements, each plate is fixed by spot welding, and the upper parts of each main plate of the pulley support are fixed by using a welding process support, finally, each heavy plate is assembled and welded to the corresponding main plate according to requirements, and the pulley support is completed.

[0025] When each heavy plate on the pulley support 3 is processed, a processing allowance of 3-4 mm is reserved for the thickness of the plate.

[0026] Then, the preparation of the upper cylinder body 1 is performed: The upper cylinder body 1 is a conical cylinder structure, the panels and webs constituting the upper cylinder body 1 are lofted and cut, and no trimming allowance is placed at the lower end of the panels and webs, only welding shrinkage allowance is placed, and when the upper cylinder body is manufactured, it is necessary to ensure that the edges of the upper and lower ends are flush and the overall flatness is ensured. After the upper cylinder body 1 is manufactured, the main plate of the pulley support is installed and fixed by spot welding, and the remaining parts of the pulley support are not installed, after the pulley support is installed in place, each part is installed in place, and it is necessary to ensure that the gap between the main plates meets the requirements. The upper anchoring assembly 5 is not installed first, and after the upper cylinder and the lower cylinder are pre-assembled and marked, the upper anchoring assembly is assembled and welded in place.

[0027] Finally, the lifting lugs are welded on the pulley support 3 and the upper cylinder body 1.

[0028] When the upper cylinder body 1 is prepared, 400 mm is left at the lower end of the panels and webs of the upper cylinder body 1 without welding, and the welding is completed when the upper cylinder and the lower cylinder are assembled and folded in place in the later stage.

[0029] Specifically, the preparation of the lower cylinder includes the following steps: First, the preparation of the lower cylinder body 2 is performed: The upper end surface of the lower cylinder body 2 is a quadrilateral structure, and the lower end surface is an octagonal structure. The lower cylinder body 2 is divided into four segments and is cut in segments. The four segments are defined as a first segment, a second segment, a third segment and a fourth segment. The first segment and the second segment each have a bending segment on both sides. The first segment and the second segment have the same structure, and the shape of the first segment is as shown in Figure 4 The third segment and the fourth segment are both flat plates, and the third segment and the fourth segment have the same structure, and the shape of the third segment is as shown inFigure 5 as shown.

[0030] Take the steel plate corresponding to the size of the first segment and the second segment, and bend it according to the blueprint. Then take two steel plates as the third segment and the fourth segment, and assemble the first segment, the second segment, the third segment and the fourth segment to form the lower cylinder body.

[0031] Before bending the first segment and the second segment, the surface of the steel plate needs to be cleaned. The free edge of the bending needs to be polished smoothly. After bending, visual inspection, MT detection, plate thickness and outer shape size detection are performed on the bending arc part and the side edge. After bending, the excess on both sides of the upper end of the bending part needs to be marked and cut off.

[0032] Before assembling the lower cylinder body 2, find a flat ground or thick steel plate as the base for cylinder assembly. Then draw the inner and outer installation lines, cross center line and rotation center line of the lower cylinder body on the ground or thick steel plate. First, hoist the first segment and the second segment into position, align the bottom of the first segment and the second segment with the inner installation line, then install the inner installation process diagonal brace and make good anti-overturning treatment. Then hoist the third segment and the fourth segment into position respectively, align the bottom of the third segment and the fourth segment with the inner installation line, and point weld and fix the two sides after assembling in position with the first segment and the second segment. Install the outer installation process diagonal brace and make good anti-overturning treatment. After the lower cylinder body is formed, detect the outer shape size and the upper and lower opening gap size of the lower cylinder body to ensure that they meet the blueprint and process requirements.

[0033] Then, the preparation of the flange plate 4 is performed.

[0034] The flange plate 4 is divided into an even number of segments, and each segment is cut separately. Each segment has a welding shrinkage allowance at the joint between the two bolt holes. When cutting the flange plate 4, the thickness is set to 15mm, the inner diameter is reduced by 15mm, and the outer diameter is enlarged by 20mm as the welding shrinkage allowance. After cutting the segments, the butt welding groove at both ends of the joint is opened on each segment. Then, the segments are spliced and welded on the splicing process platform to form the flange plate.

[0035] The splicing process platform is made of stock steel plates. When splicing, the segments are placed on the process platform, and the inner and outer sides of the segments are positioned and adjusted by the cam and wedge and then fixed firmly to facilitate control of welding deformation. The welding process between each segment is strictly in accordance with the welding process requirements. When welding, the deformation is observed by using the horseback ruler. The same weld needs to be welded up and down alternately. The segments are turned over several times alternately for welding. After welding, the flatness is corrected, and the flatness of the segments is controlled to be less than 5mm. All joints need to be checked by UT100%+MIT100%.

[0036] After the flange plate 4 is corrected, the surface is scraped and chamfered, the scraped surface is welded with the simple body, and the other surface is processed after the whole is scribed. During the processing, the inner circle of the flange plate 4 is processed in place, and the outer circle is left for subsequent whole processing.

[0037] It should be noted that if the flatness of the flange plate 4 is found to be deformed greatly during welding, appropriate correction should be performed in time, and correction should not be performed after all the welds are welded.

[0038] After the preparation of the flange plate 4 is completed, the preparation of the arm support fixing seat 41 is performed.

[0039] The arm support fixing seat 41 includes an upper shaft hole section and a lower bent frame section. During preparation, the shaft hole section and the bent frame section are segmented and then bent into shape respectively. It should be noted that the size and angle of the shaft hole section after bending into shape are guaranteed, and the angle of the bent frame section after bending into shape is calculated in advance according to the unfolded size on the blueprint and the size in the upper and lower opening center line diagram, to ensure that the angle of the bent frame section after bending into shape and the angle of each bevel of the upper and lower opening inner opening meet the requirements.

[0040] After the shaft hole section is bent into shape, it is made into an assembly with accessories such as a transition connecting plate and a heavy plate. The shaft hole section and the transition connecting plate are first spot welded and fixed, and then adjusted and trimmed according to the assembly of the shaft hole section assembly and the simple body during the assembly of the lower cylinder, to ensure that all components are installed without problems, and then the shaft hole section and the transition connecting plate are welded.

[0041] After the bent frame section is segmented and bent into shape, the outer size line and the cross center line of the bent frame section are drawn on a flat ground or a tire frame, and the segmented bent frame section is placed in place according to the drawn line. The bent frame section is adjusted and formed, and the inner opening of each relative edge of the upper and lower openings is measured to meet the requirements of the drawing and the process. If the requirements are not met, the segmented bent frame section is re-bent and adjusted.

[0042] After confirming that the bent frame section is assembled and formed without problems, the seams between the segmented bent frame sections are spot welded and then welded, or the assembled bent frame section is assembled with the flange plate and the upper four and lower eight simple body without problems, and then the seams are welded.

[0043] The prepared flange plate 4 is assembled with the lower cylinder body 2.

[0044] During assembly, the third segment and the fourth segment are first hoisted to the upper end surface of the flange plate 4, two support plates are pre-assembled and welded on the flange plate 4, and the inner side surface of the fourth segment is adjusted to be flush with the bevel of the support plate. If there is deviation, the bevel of the support plate is trimmed according to the deviation to ensure that the bevel can be flush, and the process inclined support is removed after spot welding.

[0045] The second segment is hoisted into position, the joints between the second segment and the third segment and the fourth segment are adjusted to meet the requirements, and the vertical state of the second segment is adjusted to meet the requirements, and after the adjustment is completed, the joints are firmly spot-welded.

[0046] To ensure that the two support plates can be machined as a whole after welding, the first segment is not installed in place temporarily, and after the two support plates are machined, the first segment is installed in place.

[0047] The partition plate for connecting with the upper cylinder is hoisted at the upper end of the lower cylinder body 2, the height of the upper surface of the partition plate to the upper end of the lower cylinder body 2 is adjusted to meet the requirements, and the edges of the partition plate are flush with the edges of the upper end of the lower cylinder body 2 to ensure that the requirements for steel gasket welding are met, and the partition plate is firmly spot-welded after being placed and adjusted in place.

[0048] The positioning and external dimensions of the assembled and spliced lower cylinder are re-measured, and after confirming that they meet the requirements of the drawings without errors, welding is performed on the welds of the lower cylinder according to the welding requirements of the drawings.

[0049] After the lower cylinder is welded, the overall line is drawn to draw the center line of the lower cylinder and the positioning center line of the fixed hinge shaft hole of the two side arms.

[0050] When the heavy plate is cut, the plate thickness is pre-allowed 4mm machining allowance, and the inner hole is pre-allowed 30mm machining allowance. After the heavy plate is cut, the cross center line is drawn and the sample is knocked out to make the installation positioning mark, and then the inclined edge and the welding bevel of one side are processed according to the drawing. Then, the qualified heavy plate is installed on the inner and outer surfaces of the lower cylinder respectively, and after being aligned with the center line, the heavy plate is welded and fixed.

[0051] Finally, the lifting lug is welded on the lower cylinder body 2, and the processing is completed.

[0052] The manufacturing process of the present application divides the pyramid body into two large segments of the upper cylinder and the lower cylinder, then manufactures the upper cylinder and the lower cylinder respectively, and finally performs pre-assembly and ensures the manufacturing segment accuracy by means of line drawing to meet the manufacturing requirements and subsequent welding process requirements, thereby ensuring the machining accuracy of the whole pyramid body. Moreover, two segments are manufactured, which greatly reduces the number of welding, splicing and lifting lugs, and facilitates the machining of the pyramid body structure.

[0053] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A manufacturing process for an electric crane A-frame tower structure, the A-frame tower structure comprising an upper cylinder and a lower cylinder, the upper cylinder comprising an upper cylinder body, a pulley bracket, and an upper anchoring assembly, the pulley bracket being installed on the upper end face of the upper cylinder body and having pulley holes, with a weight plate provided at each pulley hole, the upper anchoring assembly being located beside the pulley bracket and having an inner hole, the lower cylinder comprising a lower cylinder body and a flange plate, the lower cylinder body having boom fixing hinge holes, with a weight plate provided at each boom fixing hinge hole, and the flange plate being connected to the bottom end face of the lower cylinder body, characterized in that: The manufacturing process includes the following steps: S1: First, prepare the upper cylinder and the lower cylinder separately. Then, raise and reinforce the jig at the pre-assembly point of the lower cylinder. Next, check whether the flatness of the splicing port of the upper cylinder and the lower cylinder meets the requirements. If there is any deviation, repair and adjust it to the correct position. S2: Hoist the lower cylinder onto the jig and adjust its position. Pre-assemble the lower cylinder with the upper cylinder. After assembly, place the lower cylinder onto the jig and weld process clamps at the connection between the lower and upper cylinders. Then adjust the overall level of the upper and lower cylinders. S3: Mark the upper and lower cylinders. First, mark the center reference lines on the front and sides. Then, according to the center reference lines, weld the upper anchoring components into place. Install, position, and weld the un-welded mechanical, electrical, and hydraulic pre-welded parts on the upper and lower cylinders. Complete all welding work. S4: Using the center datum line as the reference, draw the machining lines of the lower surface and outer circle of the flange plate, the boom fixing hinge shaft hole and the weight plate surface, the top pulley holes and the weight plate surface, the inner hole of the upper anchoring component and the mounting surface. S5: After scribing, re-measure and confirm that all machining lines are within a reasonable deviation range. After each machining surface can be machined, separate the upper cylinder from the lower cylinder to complete the production of the upper and lower cylinders.

2. The manufacturing process of the electric crane A-frame tower structure according to claim 1, characterized in that: The preparation of the upper cylindrical body includes the following steps: First, prepare the pulley support; Take two plates and splice them together to form a partition for setting between the pulley bracket and the upper cylinder body. Then, place the partition on a flat jig and draw the center line and the installation line of the pulley bracket main plate on the surface of the partition. Then, assemble the sealing plate at the top of the upper cylinder body and the main plates, connecting plates and partition plates that make up the pulley bracket into a whole. At this time, the plates are not welded. After adjusting the gaps between the main plates and the positioning dimensions to meet the requirements, the plates are spot welded and fixed. The upper part of each main plate of the pulley bracket is reinforced and fixed by the welding process support. Finally, each weight plate is welded to the corresponding main plate as required to complete the production of the pulley bracket. Then, the upper cylinder body is prepared; The panels and webs that make up the main body of the upper cylinder are laid out and cut. No trimming allowance is placed at the lower end of the panels and webs, only welding shrinkage allowance is placed. When making the main body of the upper cylinder, attention should be paid to ensuring that the upper and lower ends are flush and the overall flatness is good. After the main body of the upper cylinder is made, the main body of the pulley bracket is installed and spot-welded. The other parts on the pulley bracket are not installed yet. After the pulley bracket is installed, the other parts are installed, and care is taken to ensure that the gaps between the main body parts meet the requirements. The upper anchoring component will not be installed yet. After the upper and lower cylinders are pre-aligned, the upper anchoring component will be welded into place. Finally, lifting lugs are welded to the pulley bracket and the upper cylinder body.

3. The manufacturing process of the electric crane A-frame tower structure according to claim 2, characterized in that: When processing the various weight plates on the pulley bracket, a processing allowance of 3-4mm is reserved for the plate thickness.

4. The manufacturing process of the electric crane A-frame tower structure according to claim 2, characterized in that: When the upper cylinder body is being manufactured, a 400mm section is left unwelded at the lower end of the panel and web of the upper cylinder body. The welding will be completed later when the upper and lower cylinder bodies are assembled and joined together.

5. The manufacturing process of the electric crane A-frame tower structure according to claim 1, characterized in that: The preparation of the lower cylindrical body includes the following steps: First, the lower cylinder body is prepared; The lower cylinder body is divided into four sections and cut into sections. The four sections are defined as the first section, the second section, the third section and the fourth section. The first section and the second section each have a bent section on both sides, and the third section and the fourth section are both flat plates. Take steel plates of the corresponding size to the first and second sections, bend them according to the blueprint, and then take two steel plates as the third and fourth sections respectively. Assemble the first, second, third, and fourth sections to form the lower cylinder body. Then, the flange plate is prepared; The flange plate is divided into an even number of sections and cut into sections, with the joint of each section located between two bolt holes. Each joint has a welding shrinkage allowance. After cutting into sections, butt welding bevels are made at both ends of the joint on each section. Then, the sections are spliced ​​and welded together on the splicing process platform to form the flange plate. The prepared flange plate is assembled with the lower cylinder body; Finally, lifting lugs are welded onto the lower cylinder body.

6. The manufacturing process of the electric crane A-frame tower structure according to claim 5, characterized in that: Before bending the first and second sections, the surface of the steel plate needs to be cleaned and the free edges of the bending need to be polished smooth. After bending, the curved part and the side are visually inspected, MT is inspected, and the plate thickness and external dimensions are inspected. After bending, the excess material on both sides of the upper end of the bent part needs to be cut off by scribing.

7. The manufacturing process of the electric crane A-frame tower structure according to claim 5, characterized in that: Before assembling the lower cylinder body, find a flat ground or thick steel plate as a base for cylinder assembly. Then, mark the inner and outer installation lines, cross center line, and rotation center line of the lower cylinder body on the ground or thick steel plate. First, hoist the first and second sections into place, align the bottom of the first and second sections with the inner installation lines, and install process diagonal braces on the inner side to prevent overturning. Then, hoist the third and fourth sections into place, aligning the bottom of the third and fourth sections with the inner installation lines. After assembling the two sides with the first and second sections, spot weld them in place. Install process diagonal braces on the outer side to prevent overturning. After the lower cylinder body is formed, check the external dimensions and upper and lower opening dimensions of the lower cylinder body to ensure that they meet the blueprints and process requirements.

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