Welding tool and method for assembling rocker arm component of low-speed diesel engine

Abstract

The invention discloses a welding tool and method for assembling a rocker arm part of a low-speed diesel engine. The welding tool comprises a base, two horizontal transverse plates and a plurality of positioning blocks. The base is horizontally placed on the ground, the two horizontal transverse plates are welded to the two ends of the base respectively, the multiple positioning blocks are fixedly distributed on the upper planes of the two horizontal transverse plates and located on the side face of the periphery of an end block of the rocker arm component, and the end block of an oil inlet pipe of the rocker arm component is positioned through the positioning blocks before welding. Therefore, the defect of error accumulation in welding operation is avoided. The positioning problem before welding of the rocker arm component is solved, the efficiency and precision of welding and assembling operation of the rocker arm component of the low-speed diesel engine are improved, the sealing performance of the rocker arm component is guaranteed, and the welding tool has the advantages of being simple in structure, convenient to install, reliable in positioning, high in precision and high in efficiency.

Description

Technical Field

[0001] The invention relates to a manufacturing process of a low-speed marine diesel engine, in particular to a welding tool and method for assembling a rocker arm component of a low-speed diesel engine, and belongs to the technical field of marine diesel engine manufacturing. Background Art

[0002] In marine low-speed diesel engines, the rocker arm is a key moving component. Figure 3 and Figure 4 The rocker arm component includes a support plate 6 located in the middle, and oil inlet pipes 7 are welded in parallel on both sides of the support plate 6. An end block 5 is welded at both ends of each oil inlet pipe 7, and the end block 5 is provided with a through hole connected to the oil inlet pipe 7.

[0003] The traditional manufacturing and processing methods of rocker arm parts involve welding of multiple parts, which easily leads to cumulative errors, thus affecting the accuracy and sealing of the rocker arm parts. Such errors may cause serious mechanical failures, such as broken motion shafts, during the long-term reciprocating motion of the rocker arm parts, thus affecting the reliability and safety of the entire machine. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing rocker arm component welding and assembly methods, and to provide a welding tool and method for assembling low-speed diesel engine rocker arm components, which can quickly and accurately complete the positioning and tightening of each component during welding operations, thereby avoiding the cumulative errors caused by subsequent welding processing, thereby achieving the purpose of ensuring the processing accuracy and sealing of the rocker arm components.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A welding tool for assembling rocker arm components of low-speed diesel engines, the rocker arm components comprising a support plate, two oil inlet pipes are provided in parallel on both sides of the support plate, and an end block is provided at each end of the oil inlet pipe, and a through hole connected to the oil inlet pipe is provided in the end block; it is characterized in that: the welding tool comprises a base, two horizontal cross plates and a plurality of positioning blocks; the base is placed horizontally on the ground, the two horizontal cross plates are respectively welded to the two end portions of the base, and the plurality of positioning blocks are fixedly distributed on the upper planes of the two horizontal cross plates and are located on the peripheral side surfaces of the end blocks of the rocker arm components, and are used to position the end blocks.

[0007] Furthermore, a lifting lug for lifting the welding tool is fixed on the horizontal cross plate.

[0008] Furthermore, the welding tool also includes two pads for reducing pressure, the two pads are fixed to the bottom surfaces of the two side portions of the base, and the bottom planes of the two pads are kept on the same plane after processing.

[0009] Furthermore, the welding tools are all made of steel, and the connection method of each component is welding.

[0010] Furthermore, a pin hole for installing a positioning pin is provided on the positioning block.

[0011] Furthermore, the number of positioning blocks around each end block is at least three.

[0012] Furthermore, the end block is in the shape of a cube.

[0013] Furthermore, the positioning block is rectangular or cylindrical.

[0014] Another technical solution of the present invention is as follows:

[0015] A welding method for assembling rocker arm components of a low-speed diesel engine using the above-mentioned welding tool comprises the following specific steps:

[0016] 1) Fix an end block to the left end of an oil inlet pipe by bolts so that the through hole of the end block is connected to the oil inlet pipe, and then lift the oil inlet pipe to the installation height so that the end block is placed on the horizontal cross plate at the left end of the welding tool;

[0017] 2) According to the technical requirements, at least three positioning blocks are placed on the horizontal cross plate around the end block and close to the end block. During the process, the relative position between the positioning block and the end block is continuously adjusted to ensure the accurate positioning of the end block in the longitudinal and transverse directions. Then, the positioning block is fixed to the horizontal cross plate at the left end by positioning pins and welding;

[0018] 3) Fix the other end block to the right end of the oil inlet pipe by bolts so that the through hole of the end block is connected to the oil inlet pipe, and then place the end block on the horizontal cross plate at the right end of the welding tool;

[0019] 4) According to the technical requirements, at least three positioning blocks are placed on the horizontal cross plate around the right end block and close to the end block. During the process, the relative position between the positioning blocks and the end block is continuously adjusted to ensure that the right end block is accurately positioned in the longitudinal and transverse directions. Then, the positioning blocks are fixed to the horizontal cross plate at the right end by positioning pins and welding to ensure that both sides of the oil inlet pipe are firmly and accurately positioned;

[0020] 5) Repeat steps 1)-4) to firmly and accurately position the other oil inlet pipe and the end blocks at both ends thereof on the horizontal cross plates at both ends of the welding fixture, and ensure that the two oil inlet pipes remain parallel and the spacing between them meets the technical requirements;

[0021] 6) After positioning the two oil inlet pipes and their end blocks, the support plate is installed between the two oil inlet pipes, thereby completing the overall assembly of the rocker arm component;

[0022] 7) Spot welding is performed on the connection between the oil inlet pipe and the end block and the connection between the oil inlet pipe and the support plate, and then the welding tool is removed, and finally the assembly welding of the rocker arm component is completed.

[0023] The beneficial technical effects of the present invention are as follows:

[0024] The present invention overcomes the shortcomings of the existing welding and assembly operations of the rocker arm components of low-speed diesel engines, solves the positioning problem of the rocker arm components before welding, avoids the defects of error accumulation in traditional manufacturing methods, improves the efficiency and accuracy of the welding and assembly operations of the rocker arm components of low-speed diesel engines, ensures the sealing performance of the rocker arm components, and has the advantages of simple structure, easy installation, reliable positioning, high accuracy and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the tooling of the present invention.

[0026] Figure 2 yes Figure 1 Top view of the .

[0027] Figure 3 It is the front view of the present invention in use.

[0028] Figure 4 yes Figure 3 Top view of the .

[0029] In the figure,

[0030] 1—lifting ear, 2—horizontal cross plate, 3—base, 4—positioning block, 5—end block, 6—support plate, 7—oil inlet pipe, 8—shim plate. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0032] The invention is used for the assembly and welding operation of rocker arm components of low-speed diesel engines, so as to achieve the purpose of improving the operation efficiency and the welding and assembly accuracy.

[0033] See also Figure 3 and Figure 4 The rocker arm component includes a support plate 6, two oil inlet pipes 7 are provided in parallel on both sides of the support plate 6, and an end block 5 is provided at each end of the oil inlet pipe 7. A through hole connected to the oil inlet pipe 7 is provided in the end block 5.

[0034] See also Figure 1 and Figure 2 The welding tooling includes a lifting lug 1, a horizontal cross plate 2, a base 3, a positioning block 4 and a pad 8, all of which are made of steel, wherein the base 3 is made of H-shaped steel.

[0035] The base 3 is placed on the ground as a basic structure, and its length is customized according to the length of the oil inlet pipe 7 to meet the bearing capacity of the welding tooling and has good stability.

[0036] Two horizontal cross plates 2 are welded to the two ends of the upper plane of the base 3, and their size and position are determined and adjusted according to the requirements of the oil inlet pipe 7. The thickness of the size is not less than 6mm, and the horizontal cross plates 2 are parallel to the upper surface of the base 3, and the length matches the length of the oil inlet pipe 7. The horizontal cross plates 2 are welded to the base 3 to provide a stable working platform for the assembly of the rocker arm components, so as to provide uniform support during the assembly process.

[0037] Two lifting lugs 1 are respectively welded on two horizontal cross plates 2 to facilitate the lifting and movement of the welding tool. The holes of the lifting lugs 1 are drilled and firmly connected to the horizontal cross plates 2 by welding to protect other parts of the welding tool from excessive stress or damage.

[0038] A plurality of positioning blocks 4 are arranged on the upper plane of the horizontal cross plate 2 to provide longitudinal and lateral abutment and displacement constraints to the end block 5 of the rocker arm component, thereby achieving accurate positioning of the oil inlet pipe 7 and the end block 5. Figure 2 As shown, the positions and heights of the positioning blocks 4 on the left and right sides are the same and symmetrical with respect to the central axis of the welding fixture. The number of positioning blocks distributed around each of the end blocks 5 is at least three, and the positioning blocks 4 can be rectangular or cylindrical. The positioning blocks 4 are provided with pin holes for installing positioning pins, and the pin hole accuracy is ensured by pre-drilling and precision boring processing to meet the positioning accuracy requirements of the positioning blocks 4.

[0039] At the same time, the welding tool also includes two pads 8, the pads 8 are welded at both ends of the bottom of the base 3, and the width of the pads 8 matches the flange width of the base 3 to ensure a stable support surface. The pads 8 are used to adjust the height and levelness of the base 3 to ensure the accuracy and levelness of the structural installation. At the same time, the pads 8 can also play a certain shock absorption and buffering role, reducing the direct impact of external loads on the H-shaped steel structure of the base 3.

[0040] See also Figure 3 and Figure 4 The welding method for assembling the rocker arm components of a low-speed diesel engine according to the present invention is as follows:

[0041] 1) Fix an end block 5 to the left end of an oil inlet pipe 7 by bolts, so that the through hole of the end block 5 is connected to the oil inlet pipe 7, and then lift the oil inlet pipe 7 to the installation height, so that the end block 5 is placed on the horizontal cross plate 2 at the left end of the welding tool;

[0042] 2) According to the technical requirements, at least three positioning blocks 4 are placed on the horizontal cross plate 2 around the end block 5 and close to the end block 5. During the process, the relative position between the positioning block 4 and the end block 5 is continuously adjusted to ensure the accurate positioning of the end block 5 in the longitudinal and transverse directions. Then, the positioning block 4 is fixed to the horizontal cross plate 2 at the left end by positioning pins and welding;

[0043] 3) Fix the other end block 5 to the right end of the oil inlet pipe 7 by means of bolts, so that the through hole of the end block 5 is connected to the oil inlet pipe 7, and then place the end block 5 on the horizontal cross plate 2 at the right end of the welding tool;

[0044] 4) According to the technical requirements, at least three positioning blocks 4 are placed on the horizontal cross plate 2 around the right end block 5 and close to the end block 5. During the process, the relative position between the positioning blocks 4 and the end block 5 is continuously adjusted to ensure that the right end block 5 is accurately positioned in the longitudinal and transverse directions. Then, the positioning blocks 4 are fixed to the horizontal cross plate 2 at the right end by positioning pins and welding to ensure that both sides of the oil inlet pipe 7 are firmly and accurately positioned;

[0045] 5) Repeat steps 1)-4) to firmly and accurately position another oil inlet pipe 7 and the end blocks 5 at both ends thereof on the horizontal cross plates 2 at both ends of the welding fixture, and ensure that the two oil inlet pipes 7 remain parallel and the spacing between them meets the technical requirements;

[0046] 6) After positioning the two oil inlet pipes 7 and their end blocks 5, the support plate 6 is installed between the two oil inlet pipes 7, thereby completing the overall assembly of the rocker arm component;

[0047] 7) Spot welding is performed on the connection between the oil inlet pipe 7 and the end block 5 and the connection between the oil inlet pipe 7 and the support plate 6, and then the welding tool is removed, and finally the assembly welding of the rocker arm components is completed.

[0048] In summary, the present invention solves the problem of low welding and assembly efficiency of rocker arm components of low-speed diesel engines, effectively avoids the cumulative error problem caused by welding of multiple components in traditional manufacturing methods, makes the assembly process more efficient, ensures the manufacturing accuracy and sealing of the rocker arm components, thereby improving the operating efficiency and accuracy of the welding and assembly of the rocker arm components.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made according to the content of the present application should be within the technical scope of the present invention.

Claims

1. A welding tool for assembling a rocker arm component of a low-speed diesel engine, wherein the rocker arm component comprises a support plate, two oil inlet pipes are arranged in parallel on both sides of the support plate, and an end block is arranged at each end of the oil inlet pipe, and a through hole connected to the oil inlet pipe is arranged in the end block; characterized in that: The welding tooling comprises a base, two horizontal cross plates and a plurality of positioning blocks; the base is placed horizontally on the ground, the two horizontal cross plates are respectively welded to the two ends of the base, and the plurality of positioning blocks are fixedly distributed on the upper planes of the two horizontal cross plates and are located on the peripheral side surfaces of the end block of the rocker arm component, for positioning the end block.

2. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1, characterized in that: The horizontal cross plate is fixed with a lifting lug for lifting the welding tool.

3. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1 is characterized in that: The welding tool also includes two pads for reducing pressure, the two pads are fixed to the bottom surfaces of the two side parts of the base, and the bottom planes of the two pads are kept on the same plane after processing.

4. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1, 2 or 3, characterized in that: The welding tools are all made of steel, and the connection method of each component is welding.

5. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1, characterized in that: The positioning block is provided with a pin hole for installing a positioning pin.

6. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1 or 5, characterized in that: The number of positioning blocks around each end block is at least three.

7. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 6, characterized in that: The end block is in the shape of a cube.

8. The welding tool for assembling rocker arm components of a low-speed diesel engine according to claim 1, characterized in that: The positioning block is rectangular or cylindrical.

9. A welding method for assembling rocker arm components of a low-speed diesel engine using the welding tool as claimed in claim 1, characterized in that: The welding method comprises the following specific steps: 1) Fix an end block to the left end of an oil inlet pipe by bolts so that the through hole of the end block is connected to the oil inlet pipe, and then lift the oil inlet pipe to the installation height so that the end block is placed on the horizontal cross plate at the left end of the welding tool; 2) According to the technical requirements, at least three positioning blocks are placed on the horizontal cross plate around the end block and close to the end block. During the process, the relative position between the positioning block and the end block is continuously adjusted to ensure the accurate positioning of the end block in the longitudinal and transverse directions. Then, the positioning block is fixed to the horizontal cross plate at the left end by positioning pins and welding; 3) Fix the other end block to the right end of the oil inlet pipe by bolts so that the through hole of the end block is connected to the oil inlet pipe, and then place the end block on the horizontal cross plate at the right end of the welding tool; 4) According to the technical requirements, at least three positioning blocks are placed on the horizontal cross plate around the right end block and close to the end block. During the process, the relative position between the positioning blocks and the end block is continuously adjusted to ensure that the right end block is accurately positioned in the longitudinal and transverse directions. Then, the positioning blocks are fixed to the horizontal cross plate at the right end by positioning pins and welding to ensure that both sides of the oil inlet pipe are firmly and accurately positioned; 5) Repeat steps 1)-4) to firmly and accurately position the other oil inlet pipe and the end blocks at both ends thereof on the horizontal cross plates at both ends of the welding fixture, and ensure that the two oil inlet pipes remain parallel and the spacing between them meets the technical requirements; 6) After positioning the two oil inlet pipes and their end blocks, the support plate is installed between the two oil inlet pipes, thereby completing the overall assembly of the rocker arm component; 7) Spot welding is performed on the connection between the oil inlet pipe and the end block and the connection between the oil inlet pipe and the support plate, and then the welding tool is removed, and finally the assembly welding of the rocker arm component is completed.

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