Method of manufacturing a roll-on ramp

Abstract

The present application relates to the ship technology field, especially a kind of manufacturing method of roll-on ramp, it includes the following steps: S1, according to drawing manufacturing front ramp, rear ramp and multiple pivot pieces;S2, multiple side edge eye plate pieces are set at intervals on rear ramp, multiple side edge eye plate pieces are fixedly welded with rear ramp;Multiple intermediate eye plates are set at intervals on front ramp, multiple intermediate eye plates are fixedly welded with front ramp, and multiple intermediate eye plates are set one by one with multiple side edge eye plate pieces;S3, pivot piece is worn in intermediate eye plate and side edge eye plate piece;S4, positioning line is drawn through each pivot piece;S5, the position of intermediate eye plate and side edge eye plate piece is adjusted, so that positioning line is in straight line state, and the axis of all pivot pieces coincides with positioning line;S6, all intermediate eye plates and side edge eye plate pieces are welded and fixed.The present application can guarantee installation precision, and can shorten construction cycle, improve construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a method for manufacturing a roll-on / roll-off ramp. Background Technology

[0002] PCTC (Plan-to-Ro) hull-off ramps consist of a forward ramp and an aft ramp. The forward ramp has multiple side eyeplates spaced apart, each consisting of two relatively spaced side eyeplates. The aft ramp has multiple intermediate eyeplates spaced apart, inserted between two side eyeplates and connected by pins, allowing the forward and aft ramps to rotate. During ramp manufacturing, conventional sectional construction processes are followed, making precision control difficult. The high precision required for the rotating hinge between the forward and aft ramps means that complete welding cannot be achieved during sectional fabrication. The intermediate and side eyeplates must be adjusted during the assembly phase before welding, and welding precision cannot be guaranteed. This method results in a long shipbuilding cycle and low construction efficiency.

[0003] Therefore, a method for manufacturing roll-on / roll-off scaffolding is needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method for manufacturing a roll-on scaffolding plank that can ensure installation accuracy, shorten the construction cycle, and improve construction efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The manufacturing method of roll-on / roll-off scaffolding includes the following steps:

[0007] S1. Manufacture the front ramp, rear ramp, and multiple pivot components according to the drawings;

[0008] S2. Multiple side eyeplates are spaced apart on the rear jump plate, and the multiple side eyeplates are positioned and welded to the rear jump plate; multiple intermediate eyeplates are spaced apart on the front jump plate, and the multiple intermediate eyeplates are positioned and welded to the front jump plate, and the multiple intermediate eyeplates are correspondingly arranged with the multiple side eyeplates.

[0009] S3. Connect the front jump plate and the rear jump plate so that the middle eye plate is inserted into the side eye plate component, and pass the pivot component through the middle eye plate and the side eye plate component;

[0010] S4. Pull the positioning line through each of the said rotating shafts;

[0011] S5. Adjust the positions of the middle eye plate and the side eye plate so that the positioning line is in a straight line and the axis of all the rotating shafts coincides with the positioning line;

[0012] S6. Weld and fix all the intermediate eyeplates and the side eyeplates.

[0013] In some embodiments, the manufacturing steps of the front ramp in step S1 are as follows:

[0014] S11. Cut the board material into panels according to the drawings;

[0015] S12. Assemble and weld the panels to form a sheet body;

[0016] S13. Place the sheet body onto the jig and weld longitudinal rib ball flat steel to form a deck sheet body;

[0017] S14. Weld a plurality of T-beams on one side of the deck sheet having the longitudinal rib ball flat steel;

[0018] S15. Weld anti-slip square steel and iron outfitting components onto the T-beam.

[0019] In some embodiments, in step S12, the assembly and welding of the panels are carried out on a steel platform with a flatness of ≤3mm / m.

[0020] In some embodiments, in step S13, the longitudinal rib flat steel with a straightness ≥ 0.5 mm / m needs to be straightened.

[0021] In some embodiments, after the deck sheet welding is completed, the side of the deck sheet away from the longitudinal rib ball flat steel needs to be heated to eliminate welding internal stress.

[0022] In some embodiments, in step S14, the T-beam needs to be straightened by fire to ensure that the straightness is ≤0.5mm / m.

[0023] In some embodiments, the manufacturing method of the rotating shaft component in step S1 is as follows:

[0024] A panel is welded to one end of the rotating shaft tube, and a sealing plate is welded inside the other end. A first shaft hole is opened on the panel, and a second shaft hole coaxial with the first shaft hole is opened on the sealing plate. An external thread is machined on the outer side of one end of the rotating shaft tube where the end plate is located, and a limiting nut is screwed into the external thread.

[0025] In some embodiments, anti-slip grooves are formed on the surface of the limiting nut.

[0026] In some embodiments, in step S2, a first mounting line is drawn on the rear jump plate, and the side eye plate is spot-welded and fixed according to the first mounting line; a second mounting line is drawn on the front jump plate, and the middle eye plate is spot-welded and fixed according to the second mounting line.

[0027] In some embodiments, step S7 is further included: painting the front ramp and the rear ramp.

[0028] The beneficial effects of this invention are:

[0029] This invention provides a method for manufacturing a roll-on / roll-off scaffold. A front scaffold, a rear scaffold, and multiple pivot joints are manufactured according to drawings. Multiple side eyelets are spaced apart on the rear scaffold and are welded to it. Multiple intermediate eyelets are spaced apart on the front scaffold and are welded to it. The front and rear scaffolds are then joined together, with the intermediate eyelets inserted into the side eyelets. Pivot joints are inserted through the intermediate and side eyelets. A positioning line is drawn through each pivot joint, and the positions of the intermediate and side eyelets are adjusted until the positioning line is straight and the axes of all pivot joints coincide with the positioning line. All intermediate and side eyelets are then welded and fixed. This method allows the scaffold to be manufactured before the mounting stage. By using positioning lines to locate the pivot joints, the positions of the intermediate and side eyelets can be adjusted accordingly. After adjustment, they are welded and fixed. This ensures installation accuracy, shortens the construction cycle, and improves construction efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the front and rear ramps in a method for manufacturing a roll-on ramp according to the present invention.

[0032] Figure 2 This is a cross-sectional schematic diagram of the roll-on scaffold in the manufacturing method of the roll-on scaffold of the present invention;

[0033] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0034] In the picture:

[0035] 1. Front ramp; 11. Middle eye plate; 12. Anti-slip square steel; 2. Rear ramp; 21. Side eye plate; 3. Positioning line; 4. Rotary shaft; 41. Rotary shaft tube; 42. Sealing plate; 421. Second shaft hole; 43. Panel; 431. First shaft hole; 5. Limit nut. Detailed Implementation

[0036] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0037] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0039] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0040] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0041] In the manufacturing process of roll-on / roll-off scaffolding, in order to ensure installation accuracy, shorten the construction cycle, and improve construction efficiency, such as... Figures 1-3 As shown, the present invention provides a method for manufacturing a roll-on / roll-off scaffold. The method for manufacturing a roll-on / roll-off scaffold includes the following steps:

[0042] S1. Manufacture the front ramp 1, the rear ramp 2, and multiple pivot components 4 according to the drawings;

[0043] S2. Multiple side eyeplates 21 are spaced apart on the rear ramp 2, and the multiple side eyeplates 21 are positioned and welded to the rear ramp 2; multiple intermediate eyeplates 11 are spaced apart on the front ramp 1, the multiple intermediate eyeplates 11 are positioned and welded to the front ramp 1, and the multiple intermediate eyeplates 11 are positioned one-to-one with the multiple side eyeplates 21.

[0044] S3. Connect the front jump plate 1 and the rear jump plate 2 so that the middle eye plate 11 is inserted into the side eye plate 21, and pass the pivot 4 through the middle eye plate 11 and the side eye plate 21.

[0045] S4. Pull the positioning line 3 through each rotating shaft 4;

[0046] S5. Adjust the position of the middle eye plate 11 and the side eye plate 21 so that the positioning line 3 is in a straight line and the axis of all rotating shafts 4 coincides with the positioning line 3.

[0047] S6. Weld and fix all the intermediate eyeplates 11 and side eyeplates 21.

[0048] Using the above method, the scaffolding can be manufactured before the assembly stage. Furthermore, by using positioning lines 3 to position the pivot 4, the positions of the intermediate eye plate 11 and the side eye plate 21 can be adjusted according to the position of the pivot 4. After adjustment, they are welded and fixed. This ensures installation accuracy, shortens the construction cycle, and improves construction efficiency.

[0049] In some embodiments, the manufacturing steps of the front ramp 1 in step S1 are as follows:

[0050] S11. Cut the boards into panels according to the drawings;

[0051] S12. Assemble and weld the panels to form a sheet;

[0052] S13. Place the sheet on the jig and weld the longitudinal rib ball flat steel to form the deck sheet;

[0053] S14. Weld multiple T-beams on the side of the deck sheet with longitudinal rib flat steel.

[0054] S15. Weld anti-slip square steel 12 and iron outfitting components onto the T-beam. This method facilitates the construction of the front ramp 1, and the use of a jig reduces construction difficulty and improves construction quality. The longitudinal rib flat steel and T-beam enhance the strength of the front ramp 1, thus meeting the requirements for roll-on / roll-off transport; the anti-slip square steel 12 provides an anti-slip effect during roll-on / roll-off. The rear ramp 2 is manufactured in the same way as the front ramp 1, and will not be described in detail here.

[0055] In some embodiments, in step S11, plates with a thickness ≤7mm need to be leveled by a leveling machine before cutting, and the internal stress of the plate needs to be released. In step S12, the assembly and welding of the panels are carried out on a steel platform with a flatness ≤3mm / m. The panels are assembled using submerged arc welding, and the assembly gap of the panel butt joints is controlled within 0mm-0.5mm. Before welding, a pressure iron is used to weigh the panels to reduce welding deformation of the plates. Through the above methods, the deformation of the panel welding can be reduced, ensuring the manufacturing quality of the scaffolding.

[0056] In some embodiments, a truss-type jig is used, and the jig surface should be made of I-beams of not less than 20#B to ensure sufficient rigidity. The flatness of the jig should be ≤1mm / m, and the middle should not be higher than the two sides. The jig height should preferably be 800mm-1000mm. Using the above jig facilitates the subsequent installation of longitudinal stiffener flat steel and ensures the quality of installation.

[0057] In some embodiments, in step S13, longitudinal rib flat steel with a straightness ≥ 0.5 mm / m needs to be straightened. This method ensures the straightness of the longitudinal rib flat steel, guaranteeing the quality of subsequent installation. During welding and installation, the gap between fillet welds is controlled between 0 mm and 1 mm. Welding of the longitudinal rib flat steel should be performed using an automatic fillet welder and a double-sided symmetrical welding method. When installing the longitudinal rib flat steel, the baseline and structural installation line set on the jig are used as reference lines.

[0058] In some embodiments, after the deck plate welding is completed, the side of the deck plate facing away from the longitudinal rib flat steel needs to be heated to eliminate welding stress. Specifically, after the longitudinal rib flat steel is welded, the deck plate is turned over and placed on a horizontal steel platform. The deck plate is then subjected to back-heating to loosen the ribs and eliminate welding stress; the back-heating temperature must not exceed 400°C. After the back-heating is completed, the deck plate is turned over again and placed on the platform.

[0059] In some embodiments, in step S14, the T-beams need to be heat-straightened first to ensure straightness ≤0.5mm / m. Specifically, the T-beams must first be assembled on a steel platform with a flatness ≤3mm / m, using panel 43 as the base, with assembly gaps controlled at 0-1mm. An automatic fillet welder is used, employing a double-sided symmetrical welding method. After welding, the T-beams are heat-straightened again to ensure straightness ≤0.5mm / m. The T-beams are then hoisted onto the deck panels for installation, with all corner joint assembly gaps controlled at 0-1mm. The welding sequence for the T-beams on the deck panels should be: first, weld the vertical fillet welds to form the overall frame, and finally weld the flat fillet welds to the deck panels. After the T-beams are installed, the deck panels are flipped over, adjusted to a horizontal position, and the corresponding T-beam positions are back-heat-stripped to ensure the flatness of the deck panels is ≤3mm / m.

[0060] In some embodiments, the anti-slip square steel 12 is installed as follows: Installation lines are marked on the T-beam, with an allowable deviation of ≤3mm. The anti-slip square steel 12 is installed, with the installation gap controlled at 0-1mm. The anti-slip square steel 12 is welded using an automatic fillet welder, with four welders symmetrically welding from the middle outwards simultaneously. This method ensures that the welding quality of the anti-slip square steel 12 meets the requirements.

[0061] In some embodiments, after the installation of the iron outfitting components is completed, the deck panels are cut to make up the excess material: the main dimensions of the deck panels are measured using a total station to determine the main dimensions and mark the excess material cutting lines. The excess material is cut using a semi-automatic cutting machine. After cutting, the slag should be removed and the surface should be polished smooth. Defects should be repaired in a timely manner.

[0062] In some embodiments, the manufacturing method of the rotating shaft 4 in step S1 is as follows:

[0063] A panel 43 is welded to one end of the rotating shaft tube 41, and a sealing plate 42 is welded to the inside of the other end. A first shaft hole 431 is opened on the panel 43, and a second shaft hole 421 coaxial with the first shaft hole 431 is opened on the sealing plate 42. An external thread is machined on the outer side of the end plate of the rotating shaft tube 41, and a limiting nut 5 is screwed into the external thread. Specifically, the rotating shaft tube 41 is made of seamless steel tube with a thickness of 20mm, including a precision-machined shaft surface and a threaded shaft surface. The precision tolerance of the precision-machined surface is 0.05mm smaller than the tolerance of the hinge hole of the intermediate eye plate 11 and the side eye plate 21, to facilitate shaft insertion. The sealing plate 42 is made of 20mm thick steel plate and is welded to the rotating shaft tube 41 on one side, recessed 5mm into the end of the rotating shaft tube 41 (to ensure the weld leg). The second shaft hole 421 is drilled on a lathe after the entire rotating shaft tube 41 is welded together. The function of the sealing plate 42 is to serve as the impact point when the entire rotating shaft tube 41 is inserted. The panel 43 is made of 20mm thick steel plate. The side facing the rotating shaft tube 41 (which needs to be in close contact with the side eye plate during use) needs to be precision machined. Multiple small grooves are evenly distributed on the outer edge to facilitate the rotation of the rotating shaft tube 41 through the outer plate during use. The rotating shaft tube 41 is beveled and welded to the panel 43 on one side. The first shaft hole 431 is drilled on a lathe after the overall welding with the rotating shaft tube 41 is completed, ensuring that the overall first shaft hole 431 and second shaft hole 421 are on the same axis.

[0064] In some embodiments, anti-slip grooves are formed on the surface of the limiting nut 5. In this way, the limiting nut 5 can play an anti-slip role during rotation, which facilitates the installation of the limiting nut 5 on the rotating shaft tube 41.

[0065] In some embodiments, in step S2, a first mounting line is drawn on the rear ramp 2, and the side eyeplate 21 is spot-welded to be fixed according to the first mounting line; a second mounting line is drawn on the front ramp 1, and the middle eyeplate 11 is spot-welded to be fixed according to the second mounting line. This method facilitates the positioning of the side eyeplate 21 and the middle eyeplate 11.

[0066] In some embodiments, the manufacturing method of the roll-on / roll-off ramp further includes step S7: painting the front ramp 1 and the rear ramp 2. Before painting, the hinge holes of the side eye plate 21 and the middle eye plate 11 are plugged with wooden plugs or plastic tubes to protect the hole walls and prevent paint contamination.

[0067] In some embodiments, suitable flatbed trucks or modular vehicles are selected for transportation. Stacking on soft or uneven ground is strictly prohibited.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for manufacturing roll-on / roll-off scaffolding, characterized in that, The manufacturing method is carried out before the assembly stage and includes the following steps: S1. Manufacture the front scaffold (1), rear scaffold (2) and multiple rotating shafts (4) according to the drawings. Weld a panel (43) to one end of the rotating shaft tube (41) and a sealing plate (42) to the inside of the other end. Open a first shaft hole (431) on the panel (43) and open a second shaft hole (421) on the sealing plate (42) that is coaxial with the first shaft hole (431). Machine an external thread on the outside of the end of the rotating shaft tube (41) where the sealing plate (42) is located, and screw a limiting nut (5) into the external thread. S2. Multiple side eyeplates (21) are spaced apart on the rear jump plate (2), and the multiple side eyeplates (21) are positioned and welded to the rear jump plate (2); multiple intermediate eyeplates (11) are spaced apart on the front jump plate (1), and the multiple intermediate eyeplates (11) are positioned and welded to the front jump plate (1), and the multiple intermediate eyeplates (11) are correspondingly arranged with the multiple side eyeplates (21); S3. Connect the front jump plate (1) and the rear jump plate (2) so that the middle eye plate (11) is inserted into the side eye plate (21) and the pivot (4) is inserted into the middle eye plate (11) and the side eye plate (21). S4. Pull the positioning line (3) through each of the said rotating shafts (4); S5. Adjust the positions of the middle eye plate (11) and the side eye plate (21) so that the positioning line (3) is in a straight line and the axis of all the rotating shafts (4) coincides with the positioning line (3); S6. Weld and fix all the intermediate eyeplates (11) and the side eyeplates (21).

2. The method for manufacturing a roll-on / roll-off scaffold according to claim 1, characterized in that, In step S1, the manufacturing steps of the front ramp (1) are as follows: S11. Cut the board material into panels according to the drawings; S12. Assemble and weld the panels to form a sheet body; S13. Place the sheet body onto the jig and weld longitudinal rib ball flat steel to form a deck sheet body; S14. Weld a plurality of T-beams on one side of the deck sheet having the longitudinal rib ball flat steel; S15. Weld anti-slip square steel (12) and iron outfitting to the T-beam.

3. The method for manufacturing a roll-on / roll-off scaffold according to claim 2, characterized in that, In step S12, the assembly and welding of the panels are carried out on a steel platform with a flatness of ≤3mm / m.

4. The method for manufacturing a roll-on / roll-off scaffold according to claim 2, characterized in that, In step S13, the longitudinal bone ball flat steel with a straightness ≥ 0.5 mm / m needs to be straightened.

5. The method for manufacturing a roll-on / roll-off scaffold according to claim 2, characterized in that, After the deck plate is welded, the side of the deck plate away from the longitudinal rib ball flat steel needs to be heated to eliminate welding internal stress.

6. The method for manufacturing a roll-on / roll-off scaffold according to claim 2, characterized in that, In step S14, the T-beam needs to be straightened by fire to ensure that the straightness is ≤0.5mm / m.

7. The method for manufacturing a roll-on / roll-off scaffolding according to claim 1, characterized in that, Anti-slip grooves are formed on the surface of the limiting nut (5).

8. The method for manufacturing a roll-on / roll-off scaffold according to claim 1, characterized in that, In step S2, a first installation line is drawn on the rear jump plate (2), and the side eye plate (21) is spot welded and fixed according to the first installation line; a second installation line is drawn on the front jump plate (1), and the middle eye plate (11) is spot welded and fixed according to the second installation line.

9. The method for manufacturing a roll-on / roll-off scaffold according to claim 1, characterized in that, It also includes step S7: painting the front ramp (1) and the rear ramp (2).

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