A detection device and method for a methanol supply pipe of a marine diesel engine

Abstract

The application discloses a kind of detection device and detection method of marine diesel engine methanol supply pipe, which belong to marine diesel engine pipe manufacturing, the two first sliding table of detection device is vertically connected, the other end is respectively extended along first, second direction;Second sliding table is slidably arranged on corresponding first sliding table along second direction, and extends along third direction;First adapter support is slidably arranged on corresponding first sliding table along first direction, and a plurality of first threaded holes are circumferentially arranged on its first connecting piece, which can be aligned with the flange butt joint hole of one end of the supply pipe, and is coaxially fastened and connected by first fastener;Second adapter support is slidably arranged on second sliding table along third direction, and a plurality of second threaded holes are circumferentially arranged on its second connecting piece, which can be aligned with the flange butt joint hole of the other end of the supply pipe, and is coaxially fastened and connected by second fastener.The detection method uses the above detection device.The application can realize the rapid and accurate detection of the size accuracy of the welded supply pipe.

Description

Technical Field

[0001] This invention relates to the field of marine diesel engine pipe manufacturing technology, and in particular to a testing device and testing method for a methanol supply pipe of a marine diesel engine. Background Technology

[0002] With increasing environmental awareness, the environmental requirements for marine engines are constantly rising, and dual-fuel engines have become an important development direction. Methanol, as a clean fuel, directly affects the normal and stable operation of dual-fuel main engines through the quality and performance of its supply pipeline. Because diesel engine main engines typically have limited installation space and fixed installation locations, strict requirements are placed on the manufacturing precision of the methanol supply pipeline.

[0003] In marine dual-fuel main engines, there is a type of three-section methanol supply pipe. This pipe is welded together from three sections, with the extensions of the first and third sections perpendicular to each other and not on the same plane. The two sections are connected by the second section. Because this three-section structure requires three welding operations, welding deformation is highly likely to occur during the welding process. Furthermore, the lack of effective testing methods makes it difficult to accurately control the final manufacturing precision of the pipe, hindering stable installation. Additionally, since the supply pipes in new dual-fuel main engines are made of stainless steel, which produces even greater deformation during welding, controlling and meeting the manufacturing precision standards for this three-section supply pipe becomes even more challenging.

[0004] Therefore, there is an urgent need to provide a testing device and method for methanol supply pipes in marine diesel engines to achieve rapid and accurate testing of the dimensional accuracy of the supply pipes after welding. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device and method for methanol supply pipes of marine diesel engines, which can achieve rapid and accurate testing of the dimensional accuracy of the supply pipes after welding.

[0006] Based on the above concept, the technical solution adopted by this invention is as follows: A testing device for a methanol supply pipe of a marine diesel engine, the supply pipe comprising a first pipe section, a second pipe section, and a third pipe section connected in sequence, wherein the extension lines of the first pipe section and the third pipe section are perpendicular to each other and not in the same plane, and both ends of the supply pipe are fitted with connecting flanges, the connecting flanges having a plurality of circumferentially spaced mating holes, the testing device for the methanol supply pipe of the marine diesel engine comprising: Two first slides are connected vertically at one end, and the other ends extend in the first and second directions respectively. The second slide is slidably disposed on the first slide extending along the sliding direction and extends toward the third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The first adapter bracket is slidably disposed on the first slide table extending along the first direction and includes a first connector. The first connector ring has a plurality of first threaded holes spaced apart circumferentially along its own central axis. The plurality of first threaded holes can be aligned one by one with the plurality of mating holes of the connecting flange at one end of the liquid supply pipe. By screwing in the matching first fastener, the first connector is coaxially and directly connected to the corresponding connecting flange. The second adapter bracket is slidably disposed on the second slide table along the third direction and includes a second connector. The second connector ring has a plurality of second threaded holes spaced apart circumferentially along its own central axis. The plurality of second threaded holes can be aligned one by one with the plurality of mating holes of the connecting flange at the other end of the liquid supply pipe. By screwing in the matching second fastener, the second connector is coaxially and directly connected to the corresponding connecting flange.

[0007] Furthermore, the second slide table includes a first slide plate and two first slide rails. The first slide plate is slidably mounted on the first slide table, and the two first slide rails are spaced apart on the first slide plate along the second direction. The second adapter bracket also includes a second slide plate, which is slidably mounted on the two first slide rails. The second connector includes a butt joint and a connecting pipe. The butt joint is fixedly sleeved on one end of the connecting pipe for fitting and mating with the corresponding connecting flange to connect the connecting pipe to the liquid supply pipe. The connecting pipe is fixedly inserted through the second slide plate and extends out between the two first slide rails to connect an external leak detection device. The end of the liquid supply pipe away from the butt joint is blocked by the first connector. Sealing gaskets are sandwiched between the butt joint and the corresponding connecting flange, as well as between the first connector and the corresponding connecting flange.

[0008] Furthermore, the second connector also includes a connecting plate, which is fixedly sleeved on the outer surface of the connecting tube and detachably connected to the side of the second slide plate opposite to the second slide table.

[0009] Furthermore, the first slide rail is provided with a first slide bar with a T-shaped cross section, and the second adapter bracket also includes two sets of first sliders. The two sets of first sliders are disposed on the second slide plate and are slidably sleeved on the first slide bars of the two first slide rails in a one-to-one correspondence.

[0010] Furthermore, a first limiting block is provided at both ends of the first slider along its length.

[0011] Furthermore, each of the first slides includes a first base and two second slide bars, the two second slide bars being spaced apart on the first base, the first adapter bracket being slidably fitted onto the two second slide bars of the corresponding first slide via two sets of second sliders, and the second slide being slidably fitted onto the two second slide bars of the corresponding first slide via two sets of third sliders.

[0012] Furthermore, the first base is an I-beam, and the two second slide bars are correspondingly disposed on the two side wings at the top of the first base.

[0013] Furthermore, on the two side wings at the bottom of the first base, a plurality of fixing holes are spaced apart along the first direction. The fixing holes are used to insert fasteners to fix the first base to the external operating platform.

[0014] Furthermore, each of the second sliders is provided with a second limiting block at both ends along its length.

[0015] A method for detecting methanol supply pipes in marine diesel engines, employing the aforementioned detection device for methanol supply pipes in marine diesel engines, comprising: S1. Align the mating holes of the connecting flange at one end of the liquid supply pipe to be tested with the first threaded holes of the first connector and screw in the first fasteners to lock and fix them. S2. Adjust the position of the first adapter bracket and the position of the second slide, and push the second adapter bracket closer to the connecting flange at the other end of the liquid supply pipe until the second connector is flush and coaxial with the connecting flange and the second threaded hole is aligned with the mating hole. Screw in the second fastener to lock it. If the second connector cannot be aligned and locked with the connecting flange, the liquid supply pipe is directly judged to be unqualified. If it can be aligned and locked, proceed to the next step. S3. Measure the coordinate parameters of the first and second adapter brackets, and compare the measured parameters with the theoretical parameters. If they meet the accuracy requirements of the drawings, they are deemed qualified; otherwise, they are deemed unqualified.

[0016] The beneficial effects of this invention are: The invention proposes a testing device for a methanol supply pipe in a marine diesel engine. This device aligns the connecting flanges at both ends of a three-section methanol supply pipe coaxially with the first connecting piece of a first adapter bracket and the second connecting piece of a second adapter bracket, respectively, and secures them with fasteners. Two mutually perpendicular first slides and a sliding second slide drive the first and second adapter brackets to slide and adjust in the first, second, and third directions in multiple dimensions. This simulates the actual spatial posture and docking requirements of the supply pipe during installation, quickly verifying whether the connecting flanges at both ends can achieve precise coaxial docking, and visually determining whether the three-section structure exhibits excessive deformation after welding. Simultaneously, by measuring the actual position parameters of the first adapter bracket, the second slide, and the second adapter bracket, and comparing them with theoretical design parameters, the device can quantitatively detect the spatial angle, relative position, and overall manufacturing precision of the supply pipe. This solves the problems of difficult-to-control welding deformation, lack of effective testing methods, difficulty in controlling manufacturing precision, and inability to meet stable installation requirements in three-section structures.

[0017] The invention proposes a testing method for methanol supply pipes in marine diesel engines. This method involves first locking one end of the supply pipe to a first connecting piece for positioning, and then using multi-dimensional sliding adjustment to achieve coaxial alignment and locking of the second connecting piece and the connecting flange at the other end. This allows for a quick and intuitive determination of whether the pipe assembly has failed due to welding deformation. For successfully assembled pipes, the measured coordinate parameters are compared with theoretical values ​​to quantitatively assess manufacturing precision. The entire process simulates the installation posture of a real ship, ensuring reliable and accurate test results. This method solves the problems of difficult control over welding deformation and low testing accuracy in three-section supply pipes, offering advantages such as intuitive judgment, high efficiency, strong accuracy, and good adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the detection device for the methanol supply pipe of a marine diesel engine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the detection device for the methanol supply pipe of a marine diesel engine provided in an embodiment of the present invention; Figure 3 This is a side view of a detection device using a methanol supply pipe for a marine diesel engine, provided in an embodiment of the present invention.

[0019] In the picture: 100. Liquid supply pipe; 101. First pipe section; 102. Second pipe section; 103. Third pipe section; 104. Connecting flange; 1. First slide table; 11. First base; 110. Fixing hole; 12. Second slide bar; 13. Second limit block; 2. Second slide; 21. First slide plate; 22. First slide rail; 221. First slide bar; 222. First limiting block; 223. Second base; 23. Third slider; 3. First adapter bracket; 31. First connector; 32. Second slider; 33. Third slide plate; 4. Second adapter bracket; 41. Second connector; 411. Connector; 412. Connecting pipe; 413. Connecting plate; 42. Second slide plate; 43. First slider. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] In a ship's dual-fuel main engine, a three-section methanol supply pipe 100 needs to be installed. This supply pipe 100 includes a first pipe section 101, a second pipe section 102, and a third pipe section 103 connected sequentially. The extension lines of the first pipe section 101 and the third pipe section 103 are perpendicular to each other and not on the same plane. Both ends of the supply pipe 100 are fitted with connecting flanges 104, and the connecting flanges 104 have multiple circumferentially spaced mating holes. Because this three-section structure requires three welding operations to complete the splicing, welding deformation is very likely to occur during the welding process. Moreover, there is currently a lack of effective testing methods, making it difficult to accurately control the final manufacturing precision of the pipeline and ensuring stable installation.

[0026] For the above issues, please refer to Figures 1 to 3 This invention proposes a detection device for a methanol supply pipe of a marine diesel engine, comprising a second slide 2, a first adapter bracket 3, a second adapter bracket 4, and two first slides 1. The two first slides 1 are vertically connected at one end, and their other ends extend in a first direction and a second direction, respectively. The second slide 2 is slidably mounted on the first slide 1 extending in the second direction and extends in the third direction. The first adapter bracket 3 is slidably mounted on the first slide 1 extending in the first direction and includes a first connector 31. The first connector 31 has multiple first threaded holes spaced circumferentially around its central axis, which can connect to... Multiple mating holes on the flange 104 at one end of the supply pipe 100 are aligned one-to-one, and by screwing in the matching first fasteners, the first connector 31 is coaxially and directly connected to the corresponding connecting flange 104. The second adapter bracket 4 is slidably mounted on the second slide table 2 along a third direction and includes a second connector 41. The second connector 41 has multiple second threaded holes spaced circumferentially around its central axis. These second threaded holes can be aligned one-to-one with multiple mating holes on the flange 104 at the other end of the supply pipe 100, and by screwing in the matching second fasteners, the second connector 41 is coaxially and directly connected to the corresponding connecting flange 104. (See also...) Figure 1 and Figure 2 The X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction. The first direction, the second direction, and the third direction are perpendicular to each other to form a three-dimensional coordinate system.

[0027] By coaxially aligning the connecting flanges 104 at both ends of the three-section methanol supply pipe 100 with the first connecting piece 31 of the first adapter bracket 3 and the second connecting piece 41 of the second adapter bracket 4, and locking them with fasteners, the first adapter bracket 3 and the second adapter bracket 4 are adjusted in multiple dimensions in the first, second, and third directions using two mutually perpendicular first slides 1 and a sliding second slide 2. This simulates the actual spatial posture and docking requirements of the supply pipe 100 during installation, quickly verifying whether the connecting flanges 104 at both ends can achieve precise coaxial docking, and intuitively determining whether the three-section structure exhibits excessive deformation after welding. At the same time, by measuring the actual position parameters of the first adapter bracket 3, the second slide 2, and the second adapter bracket 4 and comparing them with the theoretical design parameters, the spatial angle, relative position, and overall manufacturing precision of the supply pipe 100 can be quantitatively tested, solving the problems of difficult-to-control welding deformation, lack of effective testing methods, difficulty in controlling manufacturing precision, and inability to meet stable installation requirements in the three-section structure.

[0028] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, the second slide 2 includes a first slide plate 21 and two first slide rails 22. The first slide plate 21 is slidably mounted on the first slide 1, and the two first slide rails 22 are spaced apart on the first slide plate 21 along the second direction. The second adapter bracket 4 also includes a second slide plate 42, which is slidably mounted on the two first slide rails 22. The second connector 41 includes a butt joint 411 and a connecting pipe 412. The butt joint 411 is fixedly sleeved on one end of the connecting pipe 412 for fitting and mating with the corresponding connecting flange 104 so that the connecting pipe 412 is connected to the liquid supply pipe 100. The connecting pipe 412 is vertically fixedly mounted through the second slide plate 42 and extends out between the two first slide rails 22 to connect to an external leak detection device. The end of the liquid supply pipe 100 away from the butt joint 411 is blocked by the first connector 31. Sealing gaskets are sandwiched between the butt joint 411 and the corresponding connecting flange 104, as well as between the first connector 31 and the corresponding connecting flange 104. This setup is used to recreate the actual installation posture and sealing status of the liquid supply pipe 100 on the ship's dual-fuel main engine. During testing, water can be injected into the liquid supply pipe 100 under pressure through the connecting pipe 412. Under pressure, observe whether there is leakage at each welded part of the first pipe section 101, the second pipe section 102, and the third pipe section 103, as well as at the butt joint sealing parts of the connecting flanges 104 at both ends. This allows for a direct assessment of welding defects and sealing surface fit defects. Furthermore, it enables simultaneous air tightness and liquid tightness testing based on spatial posture and manufacturing precision testing, achieving integrated installation precision verification and leakage detection. This ensures the sealing reliability and installation adaptability of the three-section methanol liquid supply pipe 100 in actual ship use.

[0029] More specifically, such as Figure 2As shown, the second connector 41 also includes a connecting plate 413, which is fixedly sleeved on the outer surface of the connecting pipe 412 and detachably connected to the side of the second slide plate 42 facing away from the second slide table 2. This detachable connection improves the assembly rigidity and positioning accuracy of the connecting pipe 412 and the second slide plate 42, and allows for quick replacement of the corresponding second connector 41 according to different specifications of the liquid supply pipe 100, thus improving the versatility and testing stability of the device.

[0030] More specifically, the first slide rail 22 is provided with a first slide bar 221 with a T-shaped cross section, and the second adapter bracket 4 also includes two sets of first sliders 43. The two sets of first sliders 43 are disposed on the second slide plate 42 and are slidably fitted onto the first slide bars 221 on the two first slide rails 22 in a one-to-one correspondence. The engagement of the T-shaped slide bar and the slider can form multiple limits in the radial and lateral directions, improve the guiding accuracy and anti-eccentric load capacity of the second slide plate 42 during the sliding process, prevent the second adapter bracket 4 from moving, tipping over or angularly deviating during the movement, docking and pressure leak detection process, ensure that the joint 411 and the connecting flange 104 always remain stable and coaxial, and improve the reliability of the detection.

[0031] Furthermore, a first limiting block 222 is provided at both ends of the first slide bar 221 along its length. The first limiting block 222 prevents the second adapter bracket 4 from slipping off the first slide rail 22, facilitating transportation.

[0032] In this embodiment, the first slide rail 22 further includes a second base 223. The first slide bar 221 is fixedly mounted on the second base 223, and the first limiting block 222 abuts against the end of the first slide rail 22 and is detachably connected to the second base 223. When assembling the second adapter bracket 4, the first limiting block 222 can be removed first, creating an open assembly space at the end of the first slide bar 221, facilitating the smooth insertion of the first slider 43 of the second adapter bracket 4 into the first slide bar 221. After assembly, the first limiting block 222 is reinstalled. The first limiting block 222 can be bolted to the second base 223.

[0033] To increase the stability of the two second bases 223, a fixing plate can be attached to the top of the two second bases 223 to constrain the lateral displacement of the second bases 223 and improve the overall structural rigidity.

[0034] Specifically, such as Figure 1 and Figure 2As shown, each first slide 1 includes a first base 11 and two second slide bars 12. The two slide bars 12 are spaced apart on the first base 11. The first adapter bracket 3 is slidably fitted onto the two second slide bars 12 of the corresponding first slide 1 via two sets of second sliders 32. The second slide 2 is slidably fitted onto the two second slide bars 12 of the corresponding first slide 1 via two sets of third sliders 23. The combination of double slide bars and double sliders increases the support area, which can improve the stability of the sliding process and suppress the wobble and shaking of the first adapter bracket 3 and the second slide 2 during movement, docking, and pressure testing. This ensures smooth overall adjustment and accurate positioning, providing stable and reliable support for the coaxial docking, accuracy testing, and sealing testing of the flanges 104 at both ends of the liquid supply pipe 100.

[0035] In this embodiment, the cross-section of the second slider 12 is also T-shaped.

[0036] In this embodiment, the first adapter bracket 3 also includes a third slide plate 33, two sets of third sliders 23 are disposed at the bottom of the third slide plate 33, and the first connector 31 is vertically and detachably connected to the top surface of the third slide plate 33.

[0037] More specifically, the first base 11 is an I-beam, and two second slide bars 12 are correspondingly arranged on the two side wings of the top of the first base 11. The I-beam itself has high bending and torsional stiffness, and is not easily deformed when bearing the weight of the first adapter bracket 3, the second slide table 2 and the liquid supply pipe 100 and withstanding the pressure detection reaction force; the two second slide bars 12 are symmetrically arranged on the top side wings of the I-beam, which facilitates positioning and welding.

[0038] More specifically, multiple fixing holes 110 are spaced apart on the two side wings at the bottom of the first base 11 along the first direction. The fixing holes 110 are used to insert fasteners to fix the first base 11 to the external operating platform. This enhances the installation stability of the entire detection device and prevents the base from shifting, shaking, or tipping during the adjustment and movement of the first adapter bracket 3 and the second slide table 2, as well as during the pressurization and leak detection of the liquid supply pipe 100.

[0039] Furthermore, each of the second slide bars 12 is provided with a second limiting block 13 at both ends along its length. The second limiting block 13 prevents the first adapter bracket 3 and the second slide table 2 from slipping off the second slide bar 12, facilitating transportation.

[0040] In this embodiment, the second limiting block 13 abuts against the end of the second slide bar 12 and is detachably connected to the first base 11. When assembling the first adapter bracket 3 and the second slide table 2, the second limiting block 13 can be removed first, creating an open assembly space at the end of the second slide bar 12. This allows the second slider 32 of the first adapter bracket 3 and the third slider 23 of the second slide table 2 to smoothly slide onto the second slide bar 12. After assembly, the second limiting block 13 is then reinstalled. The second limiting block 13 can be bolted to the first base 11.

[0041] The present invention also provides a method for detecting a methanol supply pipe for a marine diesel engine. This method uses the aforementioned detection device for the methanol supply pipe of a marine diesel engine. The method specifically includes: S1. Align the mating holes of the connecting flange 104 at one end of the liquid supply pipe 100 to be tested with the first threaded holes of the first connector 31 and screw in the first fasteners to lock and fix them. S2. Adjust the position of the first adapter bracket 3, and simultaneously adjust the position of the second slide 2. Push the second adapter bracket 4 closer to the connecting flange 104 at the other end of the liquid supply pipe 100 until the second connector 41 is flush and coaxial with the connecting flange 104, and the second threaded hole and the mating hole are aligned one by one. Screw in the second fastener to lock it. If the second connector 41 cannot be aligned and locked with the connecting flange 104, the liquid supply pipe 100 is directly determined to be unqualified. If it can be aligned and locked, proceed to the next step. S3. Measure the coordinate parameters of the first adapter bracket 3 and the second adapter bracket 4, and compare the measured parameters with the theoretical parameters. If they meet the accuracy requirements of the drawing, they are deemed qualified; otherwise, they are deemed unqualified.

[0042] This testing method first locks and positions one end of the liquid supply pipe 100 to the first connector 31, and then uses multi-dimensional sliding adjustment to achieve coaxial alignment and locking of the other end, the second connector 41, with the connecting flange 104. This allows for a quick and intuitive determination of whether the pipeline has failed due to welding deformation. For pipelines that have successfully assembled, the measured values ​​of coordinate parameters are compared with the theoretical values ​​to achieve a quantitative assessment of manufacturing precision. The entire process simulates the actual ship installation posture, and the test results are accurate and reliable. This method solves the problems of difficult control of welding deformation and low detection accuracy in the three-section liquid supply pipe 100, and has the advantages of intuitive judgment, high efficiency, strong accuracy, and good adaptability.

[0043] In this embodiment, the manufacturing accuracy requirement of ±0.5mm is used as the criterion. If the deviation of the coordinate parameters in each direction is within 0.5mm, it is judged as qualified; otherwise, it is judged as unqualified.

[0044] 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 will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. 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 detection device for a methanol supply pipe of a marine diesel engine, the supply pipe (100) comprising a first pipe section (101), a second pipe section (102), and a third pipe section (103) connected in sequence, wherein the extension lines of the first pipe section (101) and the third pipe section (103) are perpendicular to each other and not in the same plane, and both ends of the supply pipe (100) are fitted with connecting flanges (104), the connecting flanges (104) having a plurality of butt holes spaced apart circumferentially, characterized in that, The detection device for the methanol supply pipe of the marine diesel engine includes: Two first slides (1) are connected vertically at one end and extend to the first and second directions respectively at the other end; The second slide (2) is slidably disposed on the first slide (1) which extends along the sliding direction and extends toward the third direction. The first direction, the second direction and the third direction are perpendicular to each other. The first adapter bracket (3) is slidably disposed on the first slide table (1) extending along the sliding direction and includes a first connector (31). The first connector (31) has a plurality of first threaded holes spaced apart around its own central axis. The plurality of first threaded holes can be aligned one by one with the plurality of mating holes of the connecting flange (104) at one end of the liquid supply pipe (100). By screwing in the matching first fastener, the first connector (31) is coaxially connected to the corresponding connecting flange (104). The second adapter bracket (4) is slidably disposed on the second slide table (2) along the third direction and includes a second connector (41). The second connector (41) has a plurality of second threaded holes spaced apart circumferentially around its own central axis. The plurality of second threaded holes can be aligned one by one with the plurality of mating holes of the connecting flange (104) at the other end of the liquid supply pipe (100). By screwing in the matching second fastener, the second connector (41) is coaxially connected to the corresponding connecting flange (104).

2. The detection device for the methanol supply pipe of a marine diesel engine according to claim 1, characterized in that, The second slide (2) includes a first slide plate (21) and two first slide rails (22). The first slide plate (21) is slidably mounted on the first slide plate (1). The two first slide rails (22) are spaced apart on the first slide plate (21) along the second direction. The second adapter bracket (4) also includes a second slide plate (42), which is slidably mounted on the two first slide rails (22). The second connector (41) includes a mating joint (411) and a connecting pipe (412). The mating joint (411) is fixedly sleeved on one end of the connecting pipe (412) for use as a connector. The connecting pipe (412) is fitted and mated with the corresponding connecting flange (104) to connect the connecting pipe (412) to the liquid supply pipe (100). The connecting pipe (412) is fixedly installed on the second slide plate (42) and extends out from between the two first slide rails (22) to connect to the leak detection device. The end of the liquid supply pipe (100) away from the connector (411) is blocked by the first connector (31). A sealing gasket is sandwiched between the connector (411) and the corresponding connecting flange (104) and between the first connector (31) and the corresponding connecting flange (104).

3. The detection device for the methanol supply pipe of a marine diesel engine according to claim 2, characterized in that, The second connector (41) further includes a connecting plate (413), which is fixedly sleeved on the outer surface of the connecting tube (412) and detachably connected to the side of the second slide plate (42) away from the second slide table (2).

4. The detection device for the methanol supply pipe of a marine diesel engine according to claim 2, characterized in that, The first slide rail (22) is provided with a first slide bar (221) with a T-shaped cross section. The second adapter bracket (4) also includes two sets of first sliders (43). The two sets of first sliders (43) are provided on the second slide plate (42) and are slidably sleeved on the first slide bars (221) on the two first slide rails (22) in a corresponding manner.

5. The detection device for the methanol supply pipe of a marine diesel engine according to claim 4, characterized in that, The first slider (221) has a first limiting block (222) at both ends along its length.

6. The detection device for the methanol supply pipe of a marine diesel engine according to claim 1, characterized in that, Each first slide (1) includes a first base (11) and two second slide bars (12). The two second slide bars (12) are spaced apart on the first base (11). The first adapter bracket (3) is slidably sleeved on the two second slide bars (12) of the corresponding first slide (1) through two sets of second sliders (32). The second slide (2) is slidably sleeved on the two second slide bars (12) of the corresponding first slide (1) through two sets of third sliders (23).

7. The detection device for the methanol supply pipe of a marine diesel engine according to claim 6, wherein the first base (11) is an I-beam, and the two second slide bars (12) are respectively disposed on the two side wings on the top of the first base (11).

8. The detection device for the methanol supply pipe of a marine diesel engine according to claim 7, characterized in that, On the two side wings at the bottom of the first base (11), a plurality of fixing holes (110) are provided at intervals along the first direction. The fixing holes (110) are used to insert fasteners to fix the first base (11) to the external operating platform.

9. The detection device for the methanol supply pipe of a marine diesel engine according to claim 6, characterized in that, Each of the second slide bars (12) is provided with a second limiting block (13) at both ends along the length direction.

10. A method for detecting methanol supply pipes in marine diesel engines, characterized in that, The detection device for the methanol supply pipe of a marine diesel engine according to any one of claims 1-9 includes: S1. Align the mating hole of the connecting flange (104) at one end of the liquid supply pipe (100) to the first threaded hole of the first connector (31) and screw in the first fastener to lock and fix it. S2. Adjust the position of the first adapter bracket (3), and at the same time adjust the position of the second slide (2), and push the second adapter bracket (4) close to the connecting flange (104) at the other end of the liquid supply pipe (100) until the second connector (41) is flush and coaxial with the connecting flange (104) and the second threaded hole is aligned with the mating hole. Screw in the second fastener to lock it. If the second connector (41) cannot be aligned and locked with the connecting flange (104), the liquid supply pipe (100) is directly judged to be unqualified. If it can be aligned and locked, proceed to the next step. S3. Measure the coordinate parameters of the first adapter bracket (3) and the second adapter bracket (4), and compare the measured parameters with the theoretical parameters. If they meet the accuracy requirements of the drawing, they are deemed qualified; otherwise, they are deemed unqualified.

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