Correcting tool for double-wall pipe of low-speed diesel engine for methanol dual-fuel ship

Abstract

The invention belongs to the technical field of diesel engine double-wall pipe correcting tools, and particularly relates to a low-speed diesel engine double-wall pipe correcting tool for a methanol dual-fuel ship. One end of the first pipe clamp rotating piece and the first pipe clamp fixing piece are connected and buckled through the first connecting bolt to form an arc-shaped clamping face matched with the outer diameter of one end of the double-wall pipe; one end of the second pipe clamp rotating piece and the second pipe clamp fixing piece are connected and buckled through a second connecting bolt to form an arc-shaped clamping face matched with the outer diameter of the other end of the double-wall pipe, the first pipe clamp and the second pipe clamp move in the same direction or in the opposite directions by rotating the adjusting component, and therefore axial thrust or pulling force is generated. Therefore, radial force is applied to the double-wall pipe arranged in the arc-shaped clamping faces of the first pipe clamp and the second pipe clamp, and the size of the double-wall pipe is corrected to the range required by a drawing. The device is high in correction efficiency, low in labor intensity, easy in precision control and good in universality.

Description

Technical Field

[0001] The present invention belongs to the technical field of double-wall pipe correction tools for diesel engines, and particularly relates to a double-wall pipe correction tool for a methanol dual-fuel marine low-speed diesel engine. Background Art

[0002] As an environment-friendly power device, the double-wall pipe of a methanol dual-fuel marine low-speed diesel engine is used to transport methanol fuel and needs to meet strict dimensional accuracy requirements to ensure sealing and safety. In the prior art, such double-wall pipes are mostly made of imported stainless steel materials, without spare parts supply, and are prone to dimensional out-of-tolerance due to external force or stress during the assembly process, such as bending and ovality deviation, directly resulting in inability to assemble.

[0003] The correction of the double-wall pipe of the existing methanol dual-fuel marine low-speed diesel engine relies on manual knocking or mechanical jacking, which has problems such as low efficiency, high labor intensity, difficult precision control, and lack of versatility, and cannot adapt to the requirements of different models and pipe diameters. For example, during the assembly of the first domestic 6G50MEC9.6 LGIM-EGRBP#1 methanol dual-fuel main engine, due to the dimensional out-of-tolerance of the double-wall pipe, there is a risk of suspension of work, and there is an urgent need for an efficient, universal and easy-to-operate correction tool. Although there are correction devices for single-wall pipes in the prior art, due to the complex structure and large difference in material toughness of double-wall pipes, conventional tools are prone to secondary deformation or damage. Therefore, developing a correction tool that can adapt to multiple models and precisely adjust the dimensions of double-wall pipes through mechanical force has become a key requirement for improving the assembly efficiency and quality of methanol main engines. Summary of the Invention

[0004] In order to solve the problems of low efficiency, high labor intensity, difficult precision control, and poor versatility in the correction of the double-wall pipe of the existing methanol dual-fuel marine low-speed diesel engine, the present invention provides a double-wall pipe correction tool for a methanol dual-fuel marine low-speed diesel engine, comprising:

[0005] An adjustment component, with coaxial first internal threaded pipes and second internal threaded pipes respectively arranged at both ends of the adjustment component; a first pipe clamp and a second pipe clamp are respectively threadedly connected to the first internal threaded pipe and the second internal threaded pipe;

[0006] The first pipe clamp includes a first pipe clamp fixing part and a first pipe clamp rotating part; one end of the first pipe clamp rotating part is connected and fastened to the first pipe clamp fixing part through a first connecting bolt to form an arc-shaped clamping surface matching the outer diameter of one end of the double-wall pipe, and the other end of the first pipe clamp rotating part is provided with a first screw rod threadedly engaged with the first internal threaded pipe;

[0007] The second pipe clamp includes a second pipe clamp fixing member and a second pipe clamp rotating member; one end of the second pipe clamp rotating member is connected and fastened to the second pipe clamp fixing member through a second connecting bolt to form an arc-shaped clamping surface matching the outer diameter of the other end of the double-wall pipe, and the other end of the second pipe clamp rotating member is provided with a second screw rod threadedly engaged with the second internal threaded pipe;

[0008] By rotating the adjustment member, the first pipe clamp and the second pipe clamp move in the same or opposite directions, thereby generating an axial thrust or tension, so as to apply a radial force to the double-wall pipe arranged within the arc-shaped clamping surfaces of the first pipe clamp and the second pipe clamp, and correct its dimensions to the range required by the drawing.

[0009] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the thread leads of the first internal threaded pipe and the second internal threaded pipe of the adjustment device are 2-5 mm, and the rotation angle range is 0-360°.

[0010] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the arc-shaped clamping surfaces of the first pipe clamp and the second pipe clamp are covered with a polyurethane anti-slip layer.

[0011] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, a first washer is arranged between the first pipe clamp fixing member and the first connecting bolt; a second washer is arranged between the second pipe clamp fixing member and the second connecting bolt, and the first washer and the second washer are made of elastic rubber and have a thickness of 3-8 mm.

[0012] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the first connecting bolt and the second connecting bolt are made of high-strength alloy steel, and the tensile strength is ≥800 MPa.

[0013] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the first pipe clamp and the second pipe clamp can be replaced according to the diameter of the double-wall pipe, and are suitable for a variety of models of MAN B&W and WIN G&D series methanol dual-fuel diesel engines.

[0014] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the maximum correction force of the tooling is 10-20 kN, and it is applicable to a pipe diameter range of 50-300 mm.

[0015] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the outer surface of the adjustment member is provided with anti-slip lines.

[0016] According to the above-mentioned double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine, the matching tolerance between the clamping arc of the arc-shaped clamping surfaces of the first pipe clamp and the second pipe clamp and the outer diameter of the double-wall pipe is ±1 mm.

[0017] According to the above-mentioned double-wall pipe correction tooling for methanol dual-fuel marine low-speed diesel engines, the overall weight of the tooling ≤ 15 kg, and it supports single-person handling and operation.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention adopts replaceable first pipe clamps and second pipe clamps, which are adapted to double-wall pipes with different diameters, covering various models of MAN B&W and WIN G&D series. There is no need to customize tooling, and it has good versatility, greatly reducing equipment costs.

[0020] 2. The present invention uses the thrust or pull force generated by screw rotation to achieve precise dimension correction. The operation is convenient, and only a single person needs to rotate the adjustment device, reducing the labor input by more than 50% compared with the traditional method.

[0021] 3. By rotating the adjustment component of the present invention, the first pipe clamp and the second pipe clamp move in the same or opposite directions, thereby generating an axial thrust or pull force, and then applying a radial force to the double-wall pipe arranged within the arc-shaped clamping surfaces of the first pipe clamp and the second pipe clamp to correct its dimensions to the range required by the drawing. Through stress release, the precision is controllable. After the double-wall pipe is naturally placed for 10 minutes after correction, the springback amount is effectively controlled to ensure that the final dimension meets the drawing tolerance within ±0.5 mm.

[0022] 4. One end of the rotating part of the first pipe clamp of the present invention is connected and fastened to the fixing part of the first pipe clamp through the first connecting bolt to form an arc-shaped clamping surface matching the outer diameter of one end of the double-wall pipe. One end of the rotating part of the second pipe clamp is connected and fastened to the fixing part of the second pipe clamp through the second connecting bolt to form an arc-shaped clamping surface matching the outer diameter of the other end of the double-wall pipe. The clamping arc of the arc-shaped clamping surfaces of the first pipe clamp and the second pipe clamp has a matching tolerance of ±1 mm with the outer diameter of the double-wall pipe, avoiding damage to the pipe surface during the clamping process, ensuring the integrity of the double-wall pipe, and having good stability in tooling operation.

[0023] 5. The present invention does not require additional consumables or coolant, keeps the working area clean, is environmentally friendly and safe, and meets the requirements of green manufacturing. In practical applications, this tooling has successfully tripled the correction efficiency, reduced manual intervention by 70%, and the correction qualification rate is over 98%. Description of the Drawings

[0024] Figure 1 is the front view of the structural schematic diagram of a double-wall pipe correction tooling for a methanol dual-fuel marine low-speed diesel engine of the present invention.

[0025] Figure 2 is the front view of the structural schematic diagram of a double-wall pipe of a methanol dual-fuel marine low-speed diesel engine.

[0026] Figure 3 is the left view of the structural schematic diagram of a double-wall pipe of a methanol dual-fuel marine low-speed diesel engine.

[0027] Figure 4 It is a partial sectional view in the A-A direction of the front view of the structural schematic diagram of the double-wall pipe of a methanol dual-fuel marine low-speed diesel engine.

[0028] Figure 5 It is an assembly schematic diagram of a correction tool for the double-wall pipe of a methanol dual-fuel marine low-speed diesel engine and the double-wall pipe of the present invention.

[0029] In the figure: 1 - adjustment component, 11 - first internal threaded pipe, 12 - second internal threaded pipe, 21 - first pipe clamp, 22 - second pipe clamp, 211 - first pipe clamp fixing piece, 212 - first pipe clamp rotating piece, 41 - first connecting bolt, 111 - first screw rod, 221 - second pipe clamp fixing piece, 222 - second pipe clamp rotating piece, 42 - second connecting bolt, 121 - second screw rod, 31 - first washer, 32 - second washer, 10 - double-wall pipe. Specific implementation manners

[0030] Preferred implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] As Figure 1 shown: A correction tool for the double-wall pipe of a methanol dual-fuel marine low-speed diesel engine includes:

[0033] An adjustment component 1, with coaxial first internal threaded pipe 11 and second internal threaded pipe 12 respectively arranged at both ends of the adjustment component 1; a first pipe clamp 21 and a second pipe clamp 22 are respectively threadedly connected to the first internal threaded pipe 11 and the second internal threaded pipe 12;

[0034] The first pipe clamp 21 includes a first pipe clamp fixing piece 211 and a first pipe clamp rotating piece 212; one end of the first pipe clamp rotating piece 212 is connected and fastened to the first pipe clamp fixing piece 211 through a first connecting bolt 41 to form an arc-shaped clamping surface matching the outer diameter of one end of the double-wall pipe 10, and the other end of the first pipe clamp rotating piece 212 is provided with a first screw rod 111 threadedly engaged with the first internal threaded pipe 11;

[0035] The second pipe clamp 22 includes a second pipe clamp fixing piece 221 and a second pipe clamp rotating piece 222; one end of the second pipe clamp rotating piece 222 is connected and fastened to the second pipe clamp fixing piece 221 through a second connecting bolt 42 to form an arc-shaped clamping surface matching the outer diameter of the other end of the double-wall pipe 10, and the other end of the second pipe clamp rotating piece 222 is provided with a second screw rod 121 threadedly engaged with the second internal threaded pipe 12;

[0036] By rotating the adjustment component 1, the first pipe clamp 21 and the second pipe clamp 22 move in the same or opposite directions, thereby generating an axial thrust or tension, and then applying a radial force to the double-wall pipe 10 disposed within the arc-shaped clamping surfaces of the first pipe clamp 21 and the second pipe clamp 22 to correct its dimensions to the range required by the drawing.

[0037] The thread leads of the first internal threaded pipe 11 and the second internal threaded pipe 12 of the adjustment device 1 are 2 - 5 mm, and the rotation angle range is 0 - 360°.

[0038] The arc-shaped clamping surfaces of the first pipe clamp 21 and the second pipe clamp 22 are covered with a polyurethane anti-slip layer.

[0039] A first washer 31 is provided between the first pipe clamp fixing member 211 and the first connecting bolt 41; a second washer 32 is provided between the second pipe clamp fixing member 221 and the second connecting bolt 42. The first washer 31 and the second washer 32 are made of elastic rubber and have a thickness of 3 - 8 mm.

[0040] The first connecting bolt 41 and the second connecting bolt 42 are made of high-strength alloy steel, and the tensile strength is ≥800 MPa.

[0041] The first pipe clamp 21 and the second pipe clamp 22 can be replaced according to the diameter of the double-wall pipe 10, and are suitable for a variety of models of MAN B&W and WIN G&D series methanol dual-fuel diesel engines.

[0042] The maximum correction force of the tooling is 10 - 20 kN, and it is applicable to a pipe diameter range of 50 - 300 mm.

[0043] The outer surface of the adjustment component 1 is provided with anti-slip lines.

[0044] The clamping arc of the arc-shaped clamping surfaces of the first pipe clamp 21 and the second pipe clamp 22 has a matching tolerance of ±1 mm with the outer diameter of the double-wall pipe 10.

[0045] The overall weight of the tooling is ≤15 kg, and it supports single-person handling and operation.

[0047] Figure 5 Shown as follows: The specific implementation steps of the double-wall pipe correction tooling for the methanol dual-fuel marine low-speed diesel engine according to the present invention are as follows:

[0048] Step 1. Tooling assembly

[0049] Select the suitable first pipe clamp 21 and second pipe clamp 22 according to the diameter of the target double-wall pipe 1. Place the first washer 31 and second washer 32 between the first pipe clamp 21, second pipe clamp 22 and the adjustment component 1, and fasten them respectively through the first connecting bolt 41 and second connecting bolt 42. Ensure that the arc-shaped clamping surfaces of the first pipe clamp 21 and second pipe clamp 22 fit the outer diameter of the double-wall pipe 10, and the polyurethane anti-slip layer faces the pipe body of the double-wall pipe 10 to avoid slipping.

[0050] Step 2. Dimension adjustment

[0051] Rotate the handwheel of the adjustment component 1, and drive the first pipe clamp 21 and second pipe clamp 22 to move axially through the internal thread structures of the first internal thread pipe 11 and second internal thread pipe 12. In the initial state, make the distance between the first pipe clamp 21 and second pipe clamp 22 greater than the actual distance dimension of the double-wall pipe 10. Set the tooling on the pipe section of the double-wall pipe 10 to be corrected, and manually pre-tighten the first connecting bolt 41 and second connecting bolt 42 until the first pipe clamp 21 and second pipe clamp 22 slightly clamp the pipe body of the double-wall pipe 10 respectively.

[0052] Step 3. Straightening operation

[0053] Continue to rotate the adjustment component 1 clockwise. The internal thread structures of the first internal thread pipe 11 and second internal thread pipe 12 generate a thrust force to make the first pipe clamp 21 and second pipe clamp 22 contract inward, and apply a uniform radial pressure to the double-wall pipe 10; if it is necessary to expand the diameter of the double-wall pipe 10, rotate the adjustment component 1 counterclockwise to expand the first pipe clamp 21 and second pipe clamp 22 through the pulling force. During the straightening process, control the rotation force through a digital display torque wrench to ensure that the straightening force does not exceed 20 kN to avoid overloading and damaging the pipe body of the double-wall pipe 10.

[0054] Step 4. Stress release

[0055] After the straightening is completed, keep the tooling in the clamping state, let the double-wall pipe 10 stand still for 10 minutes to allow the internal stress to be released naturally. During this period, the key dimensions can be measured multiple times with a micrometer. If the springback amount exceeds the tolerance: ±0.5 mm, it is necessary to finely adjust the adjustment device for compensation.

[0056] Step 5. Disassembly and inspection

[0057] Loosen the first connecting bolt 41 and second connecting bolt 42, remove the tooling, and use a 3D scanner or caliper to comprehensively detect the dimensions of the double-wall pipe 10. After confirming that it meets the requirements of the drawing, proceed with the assembly. If it is unqualified, repeat steps 2-4 until it meets the standard.

[0058] Taking the Φ150 mm double-wall pipe of the 7G80MEC methanol main engine as an example:

[0059] Select the corresponding first pipe clamp 21 and second pipe clamp 22, clamp the arc of 150±1mm, install the tooling and pre-tighten until the distance between the first pipe clamp 21 and the second pipe clamp 22 is 602mm;

[0060] Insert the double-walled pipe 10, rotate and adjust the component 1 to a torque of 15 kN·m, and shrink the distance between the first pipe clamp 21 and the second pipe clamp 22 to 600 mm;

[0061] After standing for 10 minutes, the re-measured size is 600.2mm, which meets the tolerance requirements and the correction is completed.

[0062] Key Components Description

[0063] The first internally threaded tube 11 and the second internally threaded tube 12 adopt trapezoidal threads with a lead of 3 mm. A rotation of one circle generates an axial displacement of 3 mm, and the accuracy is controllable;

[0064] The first pipe clamp 21 and the second pipe clamp 22 are split-type designs, which support quick replacement and cover pipe diameters of 50-300 mm;

[0065] The first gasket 31 and the second gasket 32 ​​are made of rubber and have a thickness of 5 mm. They can buffer local pressure and prevent the double-walled tube 10 from being indented.

[0066] This implementation method achieves efficient and accurate correction of double-walled pipes through modular design and mechanical optimization, significantly improving the assembly reliability and economy of the methanol main engine.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-wall pipe correction tool for a methanol dual-fuel marine low-speed diesel engine, characterized in that: include: An adjustment component (1), wherein two ends of the adjustment component (1) are respectively provided with a coaxial first internally threaded tube (11) and a second internally threaded tube (12); the first internally threaded tube (11) and the second internally threaded tube (12) are respectively threadedly connected with a first tube clamp (21) and a second tube clamp (22); The first pipe clamp (21) comprises a first pipe clamp fixing member (211) and a first pipe clamp rotating member (212); one end of the first pipe clamp rotating member (212) is connected and buckled with the first pipe clamp fixing member (211) via a first connecting bolt (41) to form an arc-shaped clamping surface matching the outer diameter of one end of the double-walled pipe (10); the other end of the first pipe clamp rotating member (212) is provided with a first screw (111) threadedly matched with the first internally threaded pipe (11); The second pipe clamp (22) comprises a second pipe clamp fixing member (221) and a second pipe clamp rotating member (222); one end of the second pipe clamp rotating member (222) is connected and buckled with the second pipe clamp fixing member (221) via a second connecting bolt (42) to form an arc-shaped clamping surface matching the outer diameter of the other end of the double-walled pipe (10); the other end of the second pipe clamp rotating member (222) is provided with a second screw (121) threadedly matched with the second internally threaded pipe (12); By rotating the adjustment component (1), the first pipe clamp (21) and the second pipe clamp (22) move in the same direction or in opposite directions, thereby generating an axial thrust or a pulling force, thereby applying a radial force to the double-walled pipe (10) arranged in the arc-shaped clamping surfaces of the first pipe clamp (21) and the second pipe clamp (22), and correcting its size to the range required by the drawing.

2. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 1 is characterized in that: The thread lead of the first internally threaded tube (11) and the second internally threaded tube (12) of the adjustment device (1) is 2-5 mm, and the rotation angle range is 0-360°.

3. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 2 is characterized in that: The arc-shaped clamping surfaces of the first pipe clamp (21) and the second pipe clamp (22) are covered with a polyurethane anti-slip layer.

4. A methanol dual-fuel marine low-speed diesel engine double-wall pipe correction tool according to claim 3, characterized in that: A first washer (31) is arranged between the first pipe clamp fixing piece (211) and the first connecting bolt (41); a second washer (32) is arranged between the second pipe clamp fixing piece (221) and the second connecting bolt (42); the first washer (31) and the second washer (32) are made of elastic rubber material and have a thickness of 3-8 mm.

5. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 4 is characterized in that: The first connecting bolt (41) and the second connecting bolt (42) are made of high-strength alloy steel, and the tensile strength is ≥800MPa.

6. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 5, characterized in that: The first pipe clamp (21) and the second pipe clamp (22) can be replaced according to the diameter of the double-wall pipe (10), and are suitable for various models of MAN B&W and WIN G&D series methanol dual-fuel diesel engines.

7. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 6 is characterized in that: The maximum correction force of the tooling is 10-20kN, and is suitable for pipe diameters ranging from 50-300mm.

8. The double-wall pipe correction tool for methanol dual-fuel marine low-speed diesel engine according to claim 7, characterized in that: The outer surface of the adjustment component (1) is provided with anti-slip textures.

9. A methanol dual-fuel marine low-speed diesel engine double-wall pipe correction tool according to claim 8, characterized in that: The matching tolerance between the clamping arc of the arc-shaped clamping surfaces of the first pipe clamp (21) and the second pipe clamp (22) and the outer diameter of the double-wall pipe (10) is ±1 mm.

10. A methanol dual-fuel marine low-speed diesel engine double-wall pipe correction tool according to claim 9, characterized in that: The overall weight of the tooling is ≤15kg, and can be carried and operated by one person.

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