Large crane boom hinge point construction process

Abstract

The invention relates to a large-scale crane boom hinge point construction process. The process comprises the following steps: step 1, pretreatment and rough machining of a hinge point seat lug plate; 2, splicing and welding hinge point seat lug plates; step 3, segmented manufacturing and construction precision control of the hinge point seat; step 4, controlling the construction precision of the ship body sections at the positions of the hinge point seats; 5, hull center line marking and hull closure construction precision control at the hinge point seat position are carried out; sixthly, hinge point bases are assembled, installed and welded in a segmented mode; 7, hinge point seat closure opening bulk parts are installed and welded; 8, machining the hinge point seat; in the building process, the hinge point seat and the ship body structure are synchronously manufactured in a segmented mode, the hinge point seat is integrally installed in a segmented mode, the amount of bulk objects on site is reduced, the construction efficiency is improved, the total building period is shortened by 30 days, and the construction cost is reduced by conducting refined precision control over the building and folding welding procedures. The deviation of the installed hinge point seat can be controlled within 4 mm, and the machining requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of crane construction of a crane ship, and in particular to a construction process for a hinge point of a large crane boom. Background Art

[0002] The hinge point of a large crane boom is mainly used for the hinged position between the crane boom and the hull of a crane ship. The hinge point seat is subjected to large forces and has a dense structure. The hinge point seat of a large crane boom is generally designed as an H-shaped support structure, with a lug thickness of 100~200mm. The upper part is connected to the boom through the hinge point seat hole, pin shaft, etc. The structure is strengthened in the middle part, and the lower part extends to the main hull. The hinge point seat structure is required to be controlled within ±3mm, with a dense structure and small construction space.

[0003] The hinge points of large crane booms are subjected to very large forces, and high manufacturing precision is required. In the later stage, mechanical processing operations such as boring and scraping surfaces are required. In order to ensure the installation accuracy of the crane, it is necessary to reserve processing allowances in the mechanical processing parts. In order to ensure the subsequent processing accuracy, the conventional process route is: 1. Hull structure production; 2. Boom hinge seat parts with allowance cutting; 3. Boom hinge seat group production; 4. Hull structure forming; 5. Assemble each boom hinge seat small component in sequence; 6. Accuracy control before welding; 7. Boom hinge seat welding and forming; 8. Boom hinge seat machining.

[0004] In order to avoid the influence of deformation during the manufacture of the hull structure, the conventional process adopts a solution of bulk hinge seats to control the hinge position accuracy after the hull structure is manufactured. This solution is applicable to small hinge seats with small structural volume. For large crane boom hinge seats, a single hinge support weighs about 75 tons, and the hinge supports of the entire ship weigh 150-300 tons. They must be bulk assembled on site after the main hull structure is formed, which will extend the construction period, make on-site assembly difficult, and be greatly affected by weather such as wind and rain. The construction period is uncontrolled, affecting the project progress.

[0005] Therefore, the present invention proposes a large crane boom hinge construction process to solve the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a large crane boom hinge construction process, which adopts segmented construction, advances the process and shortens the project construction period.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a large crane boom hinge construction process, the innovation of which is: comprising the following steps: Step 1: Pretreatment and rough processing of hinge point seat ear plate; Step 2: Welding of hinge point seat ear plate; Step 3: Segmented production of hinge seat and construction accuracy control; Step 4: Control the construction accuracy of the hull sections at the hinge point position; Step 5: hull centerline marking and hinge point position hull assembly construction accuracy control; Step 6: The hinge seat is assembled and welded in sections; Step 7: Install and weld the bulk parts of the hinge seat closing opening; Step 8: Machining of hinge seat.

[0008] Furthermore, the detailed process of the hinge point seat ear plate pretreatment and rough machining in step 1 is as follows: Step 1.1, pre-processing and cutting with allowance for the hinge point seat ear plate steel plate; Step 1.2: The transition of the hinge seat ear plate is beveled, and the finished product flatness is ±1.5mm and the verticality of the cutting surface is ±2mm.

[0009] Furthermore, the detailed process of the welding of the hinge point seat ear plate in step 2 is as follows: Step 2.1, butt joint the hinge point seat ear plate, and perform assembly and positioning welding of the plate on the tire frame; Step 2.2: Use symmetrical welding during the welding process, and turn the panel over several times to control welding deformation. Before the first welding, add 3mm to the panel to prevent deformation, and add code plates around the panel or use heavy objects to control the flatness of the panel. Remove the code plates or heavy objects when turning over. After the panel is welded, the overall flatness is ±3mm.

[0010] Furthermore, the detailed process of the segmented production and construction accuracy control of the hinge seat in step 3 is as follows: Step 3.1, the hinge seat is cut into sections according to the shipbuilding standard, with a size deviation of ±2mm; Step 3.2: Control the accuracy during the assembly and production of the hinge seat segments, and control the position deviation within 3mm; Step 3.3, after the assembly of each segment of the hinge seat is completed, strengthen the support positioning inspection, and strengthen the positioning inspection of the hinge seat hole concentricity ±3mm, and the overall vertical flatness of the panel is ±3mm; Step 3.4: Before welding, add code plates and tire frames to the hinge seat sections, and adjust the fixed vertical plates; Step 3.5: The segmented welding process of the hinge seat adopts symmetrical welding to prevent welding deformation.

[0011] Furthermore, the detailed process of the hull segment construction accuracy control at the hinge seat position in step 4 is as follows: Step 4.1: Cut the hull sections at the hinge point according to the shipbuilding standards, with a size deviation of ±2mm; Step 4.2: During the assembly and production of the hull segments at the hinge point position, the accuracy is controlled and the position deviation is controlled within 3mm; Step 4.3: Punch marks, draw lines and protect the reinforcement ribs of the hinge seat section and the center of the hinge seat hole on the deck surface of the hull section at the hinge seat position; Step 4.4: After the hull sections at the hinge positions are completed, they are inspected and painted.

[0012] Furthermore, the detailed process of the hull centerline marking and the hull closing construction accuracy control of the hinge seat position in step 5 is as follows: Step 5.1: Draw a ground sample line on the hull rib line according to the reference line of the dock and the slipway to form a loading network diagram; Step 5.2: When the hull is loaded in sections, the hull is loaded step by step according to the reference line and the loading network diagram until it is fully formed; Step 5.3: When the hull sections are closed and positioned at the hinge point, the sample punch mark is used as a reference to adjust the closing sections to ensure the size of the structural reinforcement spacing after closing; Step 5.4, according to the structural data of the deck protruding after the hull is closed, trim the margin corresponding to the position of the hinge seat structure base; Step 5.5, hoist and install the hinge seat segments; Step 5.6: Open the groove according to the welding node of the hull structure.

[0013] Furthermore, when the hull segments at the hinge seat position are closed and positioned in step 5.3, the distance accuracy from the upper plug plate of the hull segment at the hinge seat position to the centerline of the hull is controlled within ±2mm; When trimming the margins at the corresponding positions of the hinge seat structure base in step 5.4, if there are too many margins, trimming is done on site, and if there are insufficient margins, beveling is done after surfacing welding on site; In step 5.6, before welding, a welding shrinkage of 3-5 mm is added to the closing seam, and symmetrical welding is adopted to prevent welding deformation.

[0014] Furthermore, the detailed process of the segmented closing, installation and welding of the hinge seat in step 6 is as follows: Step 6.1, hoist the hinge seat segment according to the centerline of the hull, and control the position deviation within 3mm; Step 6.2, add the positioning tooling of the code plate at the segmented part of the hinge seat, ensure the concentricity of the hinge seat hole is within ±3mm, and the overall vertical flatness of the panel is within ±3mm; Step 6.3: After the hinge seat is closed in sections, symmetrical welding is adopted to prevent welding deformation.

[0015] Furthermore, the detailed process of the installation and welding of the bulk parts of the hinge seat closing opening in step 7 is as follows: Step 7.1, check to ensure that the bulk separators are in place; Step 7.2, according to the data after the hinge seat is closed in sections, cut the margin with reference to the node and make the groove; Step 7.3, install bulk bulkheads according to the requirements of hull structure welding. When installing bulk bulkheads, it is necessary to arrange yard plates and hand hoists on the deck to adjust the position of bulk bulkheads to avoid interference with reinforcement during the installation process of bulk bulkheads. The position deviation of bulk bulkheads after welding is within 3mm; Step 7.4: After the bulk partition welding is completed, the stress is relieved, and the airtightness is checked and the accuracy data is recorded during the inspection.

[0016] Furthermore, the principle of mechanical processing of the hinge seat in step 8 is: first rough processing and then fine processing, before fine processing, check whether there are defects on the processing surface, if there are defects, repair them, and finally fine process them to the design requirement data; The detailed process of machining the hinge seat is as follows: Step 8.1, according to the side beam data after the hinge seat is welded, determine the machining amount of the hinge seat, and mark the machining line and inspection line; Step 8.2, bore the center line of the hinge point seat hole, first process the hinge point seat hole, and then process the plane.

[0017] The advantages of the present invention are: In the construction process of the present invention, the hinge seat is manufactured in sections synchronously with the hull structure, and the hinge seat is installed as a whole in sections, which reduces the amount of bulk materials on site, improves construction efficiency, and shortens the total construction period by 30 days. In addition, through refined precision control of the construction and closing welding processes, the deviation of the hinge seat after installation can be controlled within 4 mm, meeting the mechanical processing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a front view of the segmented hinge seat of the present invention.

[0020] Figure 2 It is a side view of the hinge seat segment of the present invention.

[0021] Figure 3 It is a distribution diagram of the hull sections at the hinge point positions of the present invention.

[0022] Figure 4 The present invention is a flow chart of the large crane boom hinge construction process. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0024] Example This embodiment provides a large crane boom hinge construction process, in which the hinge seat is manufactured in sections simultaneously with the hull structure, the process is moved forward, and the project construction period is shortened.

[0025] like Figure 1-3 As shown, the hinge seat segment includes a hinge seat, a platform plate 4, a partition plate 5 and a reinforcing rib 6. The hinge seat includes a hinge seat ear plate and a heavy plate 3. The hinge seat ear plate is vertically arranged. The hinge seat ear plate includes two panels, namely an upper panel 1 with a thickness of 200 mm and a lower panel 2 with a thickness of 100 mm. The lower panel 2 is spliced ​​below the upper panel 1. The splicing side of the upper panel 1 and the lower panel 2 has an inclined transition surface. The heavy plates 3 are arranged in pairs and are respectively assembled on both sides of the upper panel 1 corresponding to the hinge seat ear plate. The heavy plate 3 and the upper puzzle plate 1 are matched to form a hinge seat hole, and each hinge seat is connected to form a whole through the platform plate 4 and the partition plate 5. A platform plate 4 and a partition plate 5 are provided between two adjacent hinge seats. The platform plate 4 is horizontally arranged and both ends are connected to the side walls of the hinge seat on the same side. The partition plate 5 is vertically arranged and both ends are connected to the side walls of the hinge seat on the same side. The reinforcing ribs 6 are arranged in pairs, and the two reinforcing ribs 6 arranged in pairs are respectively arranged on both sides of the corresponding positions of the partition plate 5 to improve the structural strength and stability of the hinge seat segment.

[0026] like Figure 4 As shown, the large crane boom hinge construction process includes the following steps: Step 1: Pretreatment and rough processing of hinge point seat ear plate; Step 1.1, pre-processing and cutting with allowance for the hinge point seat ear plate steel plate; Step 1.2: The transition of the hinge seat ear plate is beveled, and the finished product flatness is ±1.5mm and the verticality of the cutting surface is ±2mm.

[0027] Step 2: Welding of hinge point seat ear plate; Step 2.1, butt the upper panel 1 with a thickness of 200 mm and the lower panel 2 with a thickness of 100 mm of the hinge seat ear plate, and perform panel assembly positioning welding on the tire frame; Step 2.2: Use symmetrical welding during the welding process, and turn the panel over several times to control welding deformation. Before the first welding, add 3mm to the panel to prevent deformation, and add code plates around the panel or use heavy objects to control the flatness of the panel. Remove the code plates or heavy objects when turning over. After the panel is welded, the overall flatness is ±3mm.

[0028] Step 3: Segmented production of hinge seat and construction accuracy control; Step 3.1, the hinge seat is cut into sections according to the shipbuilding standard, with a size deviation of ±2mm; Step 3.2: Control the accuracy during the assembly and production of the hinge seat segments, and control the position deviation within 3mm; Step 3.3, after the assembly of each segment of the hinge seat is completed, strengthen the support positioning inspection, and strengthen the positioning inspection of the hinge seat hole concentricity ± 3mm, and the overall vertical flatness of the lower panel 2 with a thickness of 100mm is ± 3mm; Step 3.4: Before welding, add code plates and tire frames to the hinge seat sections, and adjust the fixed vertical plates; Step 3.5: The segmented welding process of the hinge seat adopts symmetrical welding to prevent welding deformation.

[0029] Step 4: Control the construction accuracy of the hull sections at the hinge point position; Step 4.1: Cut the hull sections at the hinge point according to the shipbuilding standards, with a size deviation of ±2mm; Step 4.2: During the assembly and production of the hull segments at the hinge point position, the accuracy is controlled and the position deviation is controlled within 3mm; Step 4.3, punch marks, draw lines and protect the reinforcement ribs of the hinge seat segment and the center of the hinge seat hole on the deck surface 7 of the hull segment at the hinge seat position; Step 4.4: After the hull sections at the hinge positions are completed, they are inspected and painted.

[0030] Step 5: hull centerline marking and hinge point position hull assembly construction accuracy control; Step 5.1, draw a ground sample line on the hull rib line according to the reference line 8 of the dock and the slipway to form a loading network diagram; Step 5.2: When the hull is loaded in sections, the hull is loaded step by step according to the reference line 8 and the loading network diagram until it is fully formed; Step 5.3, when the hull sections at the hinge seat are closed and positioned, the sample punch mark is used as a reference to adjust the closed sections to ensure the size of the structural reinforcement spacing after closing. When the hull sections at the hinge seat are closed and positioned, the distance accuracy from the upper plug plate of the hull section at the hinge seat to the centerline 10 of the hull is controlled within ±2mm; Step 5.4, according to the structural data of the deck measured after the hull is closed, trim the margin of the corresponding position of the hinge seat structure base. When trimming the margin of the corresponding position of the hinge seat structure base, if there are too many margins, trim them on site. If there are insufficient margins, bevel them after surfacing welding on site; Step 5.5, hoist and install the hinge seat segments; Step 5.6, make grooves according to the welding nodes of the hull structure. Before welding, add 3-5mm welding shrinkage to the closing seam. Use symmetrical welding to prevent welding deformation.

[0031] Step 6: The hinge seat is assembled and welded in sections; Step 6.1, hoist the hinge seat segment according to the centerline of the hull, and control the position deviation within 3mm; Step 6.2, add the positioning tooling of the code plate at the segmented part of the hinge seat, ensure the concentricity of the hinge seat hole is within ±3mm, and the overall vertical flatness of the panel is within ±3mm; Step 6.3: After the hinge seat is closed in sections, symmetrical welding is adopted to prevent welding deformation.

[0032] Step 7: Install and weld the bulk parts of the hinge seat closing opening; Step 7.1, check to ensure that the bulk separators are in place; Step 7.2, according to the data after the hinge seat is closed in sections, cut the margin with reference to the node and make the groove; Step 7.3, install bulk bulkheads according to the requirements of hull structure welding. When installing bulk bulkheads, consider that there are reinforcement ribs on the bulkheads. It is necessary to arrange yard plates and hand hoists on the deck to adjust the position of bulk bulkheads to avoid interference with reinforcement ribs during installation of bulk bulkheads. The position deviation of bulk bulkheads after welding is within 3mm; Step 7.4: After the bulk partition welding is completed, the stress is relieved, and the airtightness is checked and the accuracy data is recorded during the inspection.

[0033] Step 8: Mechanical processing of hinge seat; The principle of mechanical processing of hinge seat is: follow the process of rough processing first and then fine processing. Before fine processing, check whether there are defects on the processing surface. If there are defects, they need to be repaired, and finally fine processing is carried out to the design requirements. The detailed process of mechanical processing of hinge seat is: Step 8.1, according to the side beam data after the hinge seat is welded, determine the machining amount of the hinge seat, and mark the machining line and inspection line; Step 8.2, bore the center line of the hinge point seat hole 9, first process the hinge point seat hole, and then process the plane.

[0034] The application of the large crane boom hinge construction technology can ensure that the deviation of the hinge seat is controlled within 4mm after installation, meeting the mechanical processing requirements. The hinge seat is manufactured synchronously with the hull structure and installed as a whole. The total construction period is shortened by 30 days, the amount of bulk materials on site is reduced, the construction efficiency is improved, and the construction period is shortened.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A large crane boom hinge construction process, characterized in that: The following steps are involved: Step 1: Pretreatment and rough processing of hinge point seat ear plate; Step 2: Welding of hinge point seat ear plate; Step 3: Segmented production of hinge seat and construction accuracy control; Step 4: Control the construction accuracy of the hull sections at the hinge point position; Step 5: hull centerline marking and hinge point position hull assembly construction accuracy control; Step 6: The hinge seat is assembled and welded in sections; Step 7: Install and weld the bulk parts of the hinge seat closing opening; Step 8: Machining of hinge seat.

2. The large crane boom hinge construction process according to claim 1 is characterized in that: The detailed process of the hinge point seat ear plate pretreatment and rough processing in step 1 is as follows: Step 1.1, pre-processing and cutting with allowance for the hinge point seat ear plate steel plate; Step 1.2: The transition of the hinge seat ear plate is beveled, and the finished product flatness is ±1.5mm and the verticality of the cutting surface is ±2mm.

3. The large crane boom hinge construction process according to claim 1 is characterized in that: The detailed process of the welding of the hinge point seat ear plate in step 2 is as follows: Step 2.1, butt joint the hinge point seat ear plate, and perform assembly and positioning welding of the plate on the tire frame; Step 2.2: Use symmetrical welding during the welding process, and turn the panel over several times to control welding deformation. Before the first welding, add 3mm to the panel to prevent deformation, and add code plates around the panel or use heavy objects to control the flatness of the panel. Remove the code plates or heavy objects when turning over. After the panel is welded, the overall flatness is ±3mm.

4. The large crane boom hinge construction process according to claim 1 is characterized in that: The detailed process of the segmented production and construction accuracy control of the hinge seat in step 3 is as follows: Step 3.1, the hinge seat is cut into sections according to the shipbuilding standard, with a size deviation of ±2mm; Step 3.2: Control the accuracy during the assembly and production of the hinge seat segments, and control the position deviation within 3mm; Step 3.3, after the assembly of each segment of the hinge seat is completed, strengthen the support positioning inspection, and strengthen the positioning inspection of the hinge seat hole concentricity ±3mm, and the overall vertical flatness of the panel is ±3mm; Step 3.4: Before welding, add code plates and tire frames to the hinge seat sections, and adjust the fixed vertical plates; Step 3.5: The segmented welding process of the hinge seat adopts symmetrical welding to prevent welding deformation.

5. The large crane boom hinge construction process according to claim 1 is characterized in that: The detailed process of the hull segment construction accuracy control at the hinge seat position in step 4 is as follows: Step 4.1: Cut the hull sections at the hinge point according to the shipbuilding standards, with a size deviation of ±2mm; Step 4.2: During the assembly and production of the hull segments at the hinge point position, the accuracy is controlled and the position deviation is controlled within 3mm; Step 4.3: Punch marks, draw lines and protect the reinforcement ribs of the hinge seat section and the center of the hinge seat hole on the deck surface of the hull section at the hinge seat position; Step 4.4: After the hull sections at the hinge positions are completed, they are inspected and painted.

6. The large crane boom hinge construction process according to claim 1, characterized in that: The detailed process of the hull centerline marking and the hull assembly construction accuracy control of the hinge seat position in step 5 is as follows: Step 5.1: Draw a ground sample line on the hull rib line according to the reference line of the dock and the slipway to form a loading network diagram; Step 5.2: When the hull is loaded in sections, the hull is loaded step by step according to the reference line and the loading network diagram until it is fully formed; Step 5.3: When the hull sections are closed and positioned at the hinge point, the sample punch mark is used as a reference to adjust the closing sections to ensure the size of the structural reinforcement spacing after closing; Step 5.4, according to the structural data of the deck protruding after the hull is closed, trim the margin corresponding to the position of the hinge seat structure base; Step 5.5, hoist and install the hinge seat segments; Step 5.6: Open the groove according to the welding node of the hull structure.

7. The large crane boom hinge construction process according to claim 6, characterized in that: When the hull sections at the hinge seat position are closed and positioned in step 5.3, the distance accuracy from the upper plug plate of the hull section at the hinge seat position to the centerline of the hull is controlled within ±2mm; When trimming the margins at the corresponding positions of the hinge seat structure base in step 5.4, if there are too many margins, trimming is done on site, and if there are insufficient margins, beveling is done after surfacing welding on site; In step 5.6, before welding, a welding shrinkage of 3-5 mm is added to the closing seam, and symmetrical welding is adopted to prevent welding deformation.

8. The large crane boom hinge construction process according to claim 1, characterized in that: The detailed process of the segmented closing and installation welding of the hinge seat in step 6 is as follows: Step 6.1, hoist the hinge seat segment according to the centerline of the hull, and control the position deviation within 3mm; Step 6.2, add the positioning tooling of the code plate at the segmented part of the hinge seat, ensure the concentricity of the hinge seat hole is within ±3mm, and the overall vertical flatness of the panel is within ±3mm; Step 6.3: After the hinge seat is closed in sections, symmetrical welding is adopted to prevent welding deformation.

9. The large crane boom hinge construction process according to claim 1, characterized in that: The detailed process of installing and welding the bulk parts of the hinge seat closing opening in step 7 is as follows: Step 7.1, check to ensure that the bulk separators are in place; Step 7.2, according to the data after the hinge seat is closed in sections, cut the margin with reference to the node and make the groove; Step 7.3, install bulk bulkheads according to the requirements of hull structure welding. When installing bulk bulkheads, it is necessary to arrange yard plates and hand hoists on the deck to adjust the position of bulk bulkheads to avoid interference with reinforcement during the installation process of bulk bulkheads. The position deviation of bulk bulkheads after welding is within 3mm; Step 7.4: After the bulk partition welding is completed, the stress is relieved, and the airtightness is checked and the accuracy data is recorded during the inspection.

10. The large crane boom hinge construction process according to claim 1, characterized in that: The principle of mechanical processing of the hinge seat in step 8 is: first rough processing and then fine processing, check whether there are defects on the processing surface before fine processing, if there are defects, repair them, and finally fine processing to the design requirement data; The detailed process of machining the hinge seat is as follows: Step 8.1, according to the side beam data after the hinge seat is welded, determine the machining amount of the hinge seat, and mark the machining line and inspection line; Step 8.2, bore the center line of the hinge point seat hole, first process the hinge point seat hole, and then process the plane.

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