A fuel injection tooling pipe for marine main engines and its usage method

Abstract

The present invention provides a fuel injection tooling pipe for marine main engines and a usage method. This fuel injection tooling pipe can be used for oil level measurement or fuel injection, and includes a return oil connecting pipe and a measuring pipe. The return oil connecting pipe is connected to the lubricating oil circulation tank. When measuring the oil level, the oil level gauge passes through the measuring pipe and the return oil connecting pipe and enters the lubricating oil circulation tank, and the oil level is measured by reading the oil level gauge; when fuel injection is carried out, the measuring pipe is removed, and a temporary return oil pipe is connected to the upper end of the return oil connecting pipe. The oil in the lubricating oil circulation tank enters the pipeline to be cleaned driven by the oil pump, and the oil after cleaning directly returns to the lubricating oil circulation tank through the temporary filter, the temporary return oil pipe and the return oil connecting pipe, forming a cycle. The entire fuel injection system does not pass through the main engine and has no connection with the main engine, so that the installation of the main engine and the fuel injection work of the main lubricating oil pipeline system can be carried out simultaneously without restricting each other, thereby shortening the fuel injection cycle for the main engine. At the same time, it will not cause pollution to the inside of the main engine and keep the internal components clean.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to an oil injection tooling pipe for marine main engines and a usage method thereof. Background Art

[0002] At present, the main engine lubricating oil injection mainly has two stages. The first stage is the injection of the main lubricating oil pipeline outside the main engine, and the second stage is the injection of the lubricating oil inside and outside the main engine. The purpose of the injection is mainly to flush the pipe fittings, accessories and valve parts in the main engine lubricating oil system pipeline to remove mechanical impurities brought during the manufacturing and installation processes, and to ensure the safe and normal operation of the main engine lubricating oil system. The entire injection work cycle is 20 - 50 days. After the main engine is hoisted until before the sea trial, it is the installation and construction stage. After the installation of the lubricating oil daily pipe system, related equipment, accessories, etc. is completed, and the cleaning and inspection of the lubricating oil circulating tank and related pipelines are completed, the first stage of the main engine oil injection is carried out.

[0003] As Figure 1 shown, in the usual connection method: the main engine lubricating oil header pipe 32 - the temporary filter 41 - the main engine explosion-proof door. The oil in the lubricating oil circulating tank enters the pipeline to be cleaned under the drive of the oil pump 31, and after cleaning, it returns to the lubricating oil circulating tank through the main engine lubricating oil header pipe 32, the temporary filter 41, the temporary return pipe 42, and the main engine explosion-proof door, forming an oil injection cleaning cycle. This method has a great impact on the main engine construction. Firstly, at this time, the position of the main engine is still in the adjustment stage, and the temporary return pipe from the temporary filter to the main engine explosion-proof door has a certain restrictive effect on the main engine adjustment. Secondly, the return oil enters the main engine from the explosion-proof door, and the return oil constantly flushes the main bearing and connecting rod, which will increase the construction time for the subsequent internal cleaning of the main engine. The hot air of the return oil will also cause rust stains on the accessories in the main engine, making it difficult for the subsequent internal cleaning of the engine. The simultaneous construction of the two projects restricts each other in construction, affecting the construction cycle and quality. How to solve the simultaneous construction of the main engine installation and the main engine lubricating oil injection, and improve the production efficiency and quality is an urgent problem to be solved in this field. In addition, during the oil injection process, it is necessary to measure the oil quality to judge whether the pipeline cleaning meets the acceptance requirements. At present, only the naked eye and experience can be relied on to judge the oil injection quality, lacking standard detection methods and detection data, and it is not very persuasive during acceptance. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the present invention provides an oil injection tooling pipe for marine main engines, and the oil injection tooling pipe includes:

[0005] A return oil connection pipe, the lower end of the return oil connection pipe is connected to the upper surface of the lubricating oil circulating tank;

[0006] A measuring pipe, the lower end of the measuring pipe is connected to the upper end of the return oil connection pipe;

[0007] When measuring the oil level, the oil level measuring end of the dipstick passes through the measuring pipe and the oil return pipe joint and enters the lubricating oil circulation tank, and the oil level is measured by reading the dipstick; when injecting oil, the measuring pipe is removed, and a temporary oil return pipe is connected to the upper end of the oil return pipe joint. The oil in the lubricating oil circulation tank enters the pipeline to be cleaned under the drive of the oil pump, and the cleaned oil directly returns to the lubricating oil circulation tank through the temporary filter, the temporary oil return pipe and the oil return pipe joint to form a cycle.

[0008] Preferably, an upper flange is connected to the lower end of the measuring pipe, a lower flange is connected to the upper end of the oil return pipe joint, and a plurality of quick-lock bolts are provided on the outer periphery of the lower flange to be hermetically connected to the upper flange or the temporary oil return pipe. A sealing washer is also provided between the upper flange and the lower flange.

[0009] Preferably, a measuring head with a switch valve is connected to the upper end of the measuring pipe. The switch valve is opened when measuring the oil level and closed after the measurement is completed.

[0010] Preferably, a three-way regulating valve is provided on the side wall of the oil return pipe joint. The three ports of the three-way regulating valve are respectively connected to the oil return pipe joint, a pressure gauge, and an oil inlet joint; an oil return joint is also communicated with the upper surface of the lubricating oil circulation tank. When measuring the particle size of the oil, the oil inlet joint, a particle detection instrument, and the oil return joint are sequentially connected through a hose, so that the oil flows back to the lubricating oil circulation tank after passing through the particle detection instrument, thereby completing the particle size measurement.

[0011] Preferably, a measuring head protective cover is further included, which is covered on the upper opening of the measuring head for dust protection.

[0012] Preferably, the particle detection instrument is a particle counter.

[0013] Preferably, the oil inlet joint and the oil return joint are equipped with joint protective covers for dust protection.

[0014] Preferably, the pipeline to be cleaned includes a plurality of branches, and each branch finally converges to the lubricating oil main pipe and then enters the temporary filter for filtration.

[0015] A usage method of the oil injection tooling pipe, the oil injection tooling pipe is used for oil injection or oil level measurement. When the oil injection tooling pipe is used for oil injection, it includes the following steps:

[0016] S1: Hang the temporary filter near the oil injection tooling pipe;

[0017] S2: Connect the temporary oil return pipe to the oil return pipe joint and fix and lock it with quick-lock bolts;

[0018] S3: After the pipelines and pipe fittings for the main engine fuel injection are installed, run the oil pump for 1 - 2 minutes, then stop the pump. Check whether there is any oil leakage in the entire fuel injection pipeline and deal with it in time to ensure no leakage. After confirmation, the oil pump runs for fuel injection.

[0019] S4: After fuel injection for a certain period of time, when the impurity particles on the filter paper of the temporary filter are significantly few, conduct an oil quality test. Remove the joint protection cover, clean the inlet joint, and connect the particle detection instrument through the inlet hose. One end of the return hose is connected to the cleaned return joint, and the other end is connected to the particle detection instrument.

[0020] S5: After the pressure gauge is installed, open the three - way regulating valve to control its outlet pressure below 0.6 MPa. Open the return joint. After the pressure stabilizes, conduct particle size detection. After passing the detection, conduct acceptance inspection.

[0021] S6: After the particle size detection is completed, remove the particle detection instrument and the hose. Wipe the oil stains on the inlet joint and the return joint clean, and then cover the joint protection cover.

[0022] S7: After fuel injection is completed, remove the temporary return pipe. Wipe the return pipe connection and the measuring pipe clean, and then reinstall the measuring pipe to the return pipe connection.

[0023] Preferably, when the fuel injection tooling pipe is used for oil level measurement, the following steps are further included:

[0024] T1: Wipe the measuring head clean before use.

[0025] T2: Open the measuring head protection cover and the switch valve on the measuring head.

[0026] T3: Wipe the oil level gauge measuring end of the oil level gauge clean, then slowly place the oil level gauge measuring end into the lubricating oil circulation tank. While lowering, wipe the oil level gauge clean. After the oil level gauge measuring end reaches the bottom, slowly retract the oil level gauge to read and record the value, and wipe the oil on the oil level gauge clean.

[0027] T4: After the measurement is completed, cover the measuring head protection cover.

[0028] As described above, the present invention provides a fuel injection tooling pipe for marine main engines and a usage method. This fuel injection tooling pipe can be used for oil level measurement or fuel injection, and includes a return oil connection pipe and a measurement pipe. The return oil connection pipe is connected to the lubricating oil circulation tank. When performing oil level measurement, the oil gauge passes through the measurement pipe and the return oil connection pipe and enters the lubricating oil circulation tank, and the oil level is measured by reading the oil gauge; when performing fuel injection, the measurement pipe is removed, and a temporary return oil pipe is connected to the upper end of the return oil connection pipe. The oil in the lubricating oil circulation tank enters the pipeline to be cleaned under the drive of the oil pump, and the cleaned oil directly returns to the lubricating oil circulation tank through the temporary filter, the temporary return oil pipe and the return oil connection pipe, forming a cycle. The entire fuel injection system does not pass through the main engine and has no connection with the main engine, so that the installation of the main engine and the fuel injection work of the main lubricating oil pipeline system can be carried out simultaneously without restriction on each other, thereby shortening the fuel injection cycle for the main engine. At the same time, it will not cause pollution to the inside of the main engine and keep the internal components clean. A three-way regulating valve is provided on the side wall of the return oil connection pipe for connecting a particle counter, so as to measure the oil quality while performing fuel injection.

[0029] This fuel injection tooling pipe is reasonably designed, small in size, simple in operation, and reusable, making the fuel injection and oil level measurement integrated. There is no restriction on each other during the simultaneous construction of the installation of the main engine and the fuel injection work of the main lubricating oil pipeline system. The particle detection equipment is used, changing the situation of judging the fuel injection quality by eyes and experience in the past, saving the time for fuel injection inspection and acceptance (2 - 7 days). The increase in the bottom pipe diameter of the oil level measurement pipe facilitates cleaning, reduces pollution sources such as rust at the welded joints of the through-hull parts, and plays a great role in shortening the fuel injection cycle for the main engine. Brief Description of the Drawings

[0030] Figure 1 Shows a schematic connection diagram of the fuel injection system in the prior art.

[0031] Figure 2 Shows a schematic structural diagram of the fuel injection tooling pipe in the present invention.

[0032] Figure 3 Shows a schematic installation position diagram of the fuel injection tooling pipe in the present invention.

[0033] Figure 4 Shows a schematic installation connection diagram of the fuel injection tooling pipe in the present invention when used for fuel injection.

[0034] Figure 5 Shows a schematic connection diagram of the particle measuring instrument in the present invention.

[0035] Figure 6 Shows an application schematic diagram of the fuel injection tooling pipe in the present invention when used for oil level measurement.

[0036] Description of Component Labels

[0037] 1 Measuring head protection cover 14 Connector protection cover

[0038] 2 Measuring heads 16, 42 Temporary oil return pipes

[0039] 3 On - off valve 17 Particle detection instrument

[0040] 4 Measuring pipe 18 Oil inlet hose

[0041] 5 Upper flange 19 Oil return hose

[0042] 6 Sealing washer 20 Lubricating oil circulation tank

[0043] 7 Lower flange 21 Measuring oil level gauge

[0044] 8 Quick - locking bolt 30 Oil injection tooling pipe

[0045] 9 Oil return connection 31 Oil pump

[0046] 10 Pressure gauge 32 Lubricating oil main pipe

[0047] 11 Three - way regulating valve 41 Temporary filter

[0048] 12 Oil inlet joint 43 Bracket

[0049] 13 Oil return joint Detailed implementation mode

[0050] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] When detailing the embodiments of the present invention, for the convenience of description, the cross - sectional views showing the device structure will be enlarged locally in a non - general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention herein. In addition, in actual production, three - dimensional spatial dimensions including length, width, and depth should be included.

[0052] For the convenience of description, spatial relationship terms such as "under", "below", "lower than", "beneath", "above", "on", etc. may be used herein to describe the relationship between an element or feature shown in the drawings and other elements or features. It will be understood that these spatial relationship terms are intended to encompass other directions of the device in use or operation, in addition to the directions depicted in the drawings. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can also be one or more intervening layers. As used herein, "between... and..." means including the endpoint values.

[0053] In the context of the present application, the structure in which the first feature described is "above" the second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0054] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0055] As Figures 2 - 3 shown, the present invention provides a fuel injection tooling pipe 30 for a marine main engine. The fuel injection tooling pipe 30 specifically includes:

[0056] An oil return pipe 9, the lower end of the oil return pipe 9 is connected to the upper surface of the lubricating oil circulation tank 20;

[0057] A measuring pipe 4, the lower end of the measuring pipe 4 is connected to the upper end of the oil return pipe 9;

[0058] When performing an oil level measurement, refer to Figure 6 , the oil level measuring end of the oil level gauge 21 passes through the measuring pipe 4 and the oil return pipe 9 and enters the lubricating oil circulation tank 20, and the oil level is measured by reading the oil level gauge; when performing fuel injection, refer to Figure 4 , the measuring pipe 4 is removed, and a temporary oil return pipe 16 is connected to the upper end of the oil return pipe 9. The oil in the lubricating oil circulation tank 20 enters the pipeline to be cleaned under the drive of the oil pump 31, and the cleaned oil directly returns to the lubricating oil circulation tank 20 through the temporary filter 41, the temporary oil return pipe 16, and the oil return pipe 9 to form a cycle.

[0059] Specifically, as Figure 4 shown, the pipeline to be cleaned may include multiple branches, and each branch finally converges to the lubricating oil main pipe 32 and then enters the temporary filter 41. There will be a lot of impurities in the cleaned oil, and it is filtered through the temporary filter 41 to achieve cleaning. The filtered oil then enters the lubricating oil circulation tank 20 to achieve a cycle. Here, the entire fuel injection system does not pass through the main engine and has no association with the main engine, so that the installation of the main engine and the fuel injection work of the main lubricating oil pipeline system can be constructed simultaneously without mutual restriction, thereby shortening the fuel injection cycle for the main engine. At the same time, it will not cause pollution to the inside of the main engine and keep the internal components clean.

[0060] Further, the lower end of the measuring pipe 4 is connected with an upper flange 5, and the upper end of the oil return connecting pipe 9 is connected with a lower flange 7. A plurality of quick locking bolts 8 are arranged on the outer periphery of the lower flange 7, so as to be hermetically connected with the upper flange 5 or the temporary oil return pipe 16; a sealing gasket 6 is also arranged between the upper flange 5 and the lower flange 7.

[0061] Further, the upper end of the measuring pipe 4 is connected with a measuring head 2 with a switch valve 3. When measuring the oil level, the switch valve 3 is opened, and after the measurement is completed, the switch valve 3 is closed.

[0062] Further, it also includes a measuring head protection cover 1, which is arranged on the opening of the measuring head 2 for dust protection.

[0063] Further, as Figures 4 - 5 shown, a three-way regulating valve 11 is arranged on the side wall of the oil return connecting pipe 9. The three ports of the three-way regulating valve 11 are respectively connected to the oil return connecting pipe 9, a pressure gauge 10, and an oil inlet joint 12. The upper surface of the lubricating oil circulation tank 20 is also communicated with an oil return joint 13. When measuring the particle size of the oil, the oil inlet joint 12, a particle detection instrument 17, and the oil return joint 13 are sequentially communicated through a hose, so that the oil flows back to the lubricating oil circulation tank 20 after passing through the particle detection instrument 17. The hose includes an oil inlet hose 18 and an oil return hose 19, thereby completing the particle size measurement. The pressure gauge 10 is used to measure the pressure value. The particle detection instrument 17 can be a particle size counter or other detection instruments, as long as it meets the detection requirements.

[0064] Further, the oil inlet joint 12 and the oil return joint 13 are also equipped with joint protection covers 14 for dust protection.

[0065] For the production of each component of the oil injection tooling pipe 30, the following process can be referred to:

[0066] The upper flange 5 uses a DN250 blind flange as the material. Draw a cross center line on the blind flange, mark the opening size on it according to the outer diameter of the measuring pipe 4, and send it to the machining for drilling, and chamfer 5 mm at the welding place to form the upper flange 5. When welding the upper flange 5 and the measuring pipe 4, ensure their perpendicularity to each other, control the error within ±1℃, and the concentricity within ±1 mm. When welding, the measuring head 2 needs to be removed for welding to prevent welding spatter from entering the measuring head 2, which is difficult to clean and may cause inflexibility or jamming of the valve parts. After welding, cleaning, and painting, the accessories such as the measuring head are assembled.

[0067] The lower flange 7 and the quick-lock bolt 8 are connected by welding. Before welding, the threaded part of the quick-lock bolt 8 is protected with a three-proof cloth to prevent damage to the threads by spatter during welding, so that the bolt cannot be used later. First, spot-weld the fixed sleeve on the quick-lock bolt 8. After the bolt is in the correct position and can be turned up and down flexibly, full welding is carried out. Before the oil return pipe 9 is welded to the lower flange 7, chamfers of 6 mm are made at the upper and lower ends of the oil return pipe 9, and the position of the three-way regulating valve 11 is determined on the oil return pipe 9. After drilling and tapping (M22x1.5), it is protected with butter. When the oil return pipe 9 is welded to the lower flange 7, they are perpendicular to each other, with an error of ±1 °C and a concentricity of ±1 mm. After welding, cleaning, and painting, other accessories are installed and assembled. The pressure gauge 10 is installed later during use to prevent damage.

[0068] For the welding of the oil injection tooling pipe 30 and the lubricating oil circulation tank 20, before the lubricating oil circulation tank 20 is painted and cleaned, according to the dimensions and the outer diameter of the oil return pipe 9, scribing and hole opening are carried out. When welding, the oil return pipe 9 is perpendicular to the deck, with an error of ±1 °C and a concentricity of ±1 mm. Drilling and tapping (M22x1.5) are carried out at the oil return joint 13 for installation, and it is protected with the joint protection cover 14.

[0069] Based on the above oil injection tooling pipe 30, the present invention also provides a method for using the oil injection tooling pipe 30. The oil injection tooling pipe 30 is used for oil injection or oil level measurement. When the oil injection tooling pipe 30 is used for oil injection, it includes the following steps:

[0070] S1: Lift and place the temporary filter 41 near the oil injection tooling pipe 30;

[0071] S2: Connect the temporary oil return pipe 16 to the oil return pipe 9 and fix and lock it with the quick-lock bolt 8.

[0072] S3: After the pipelines and pipe accessories for main engine oil injection are installed, the oil pump 31 runs for 1 - 2 minutes, then stops. Check whether there is any oil leakage in the entire oil injection pipeline and deal with it in time to ensure no leakage; after confirming normal, the oil pump 31 runs for oil injection;

[0073] S4: After oil injection for a certain period of time, when it is obvious that the filter paper of the temporary filter 41 has very few impurity particles, conduct an oil quality test. Remove the joint protection cover 14, clean the oil inlet joint 12 and connect it to the particle counter through the oil inlet hose 18; one end of the oil return hose 19 is connected to the cleaned oil return joint 13, and the other end is connected to the particle detection instrument 17.

[0074] S5: After the pressure gauge 10 is installed, open the three-way regulating valve 11 to control its outlet pressure below 0.6 MPa. Open the oil return joint 13, and conduct particle size detection after the pressure is stable. After passing the detection, conduct acceptance inspection.

[0075] S6: After the particle size detection is completed, remove the detection instrument 17 and the hose. After wiping the oil stains on the oil inlet joint 12 and the oil return joint 13 clean, cover the joint protection cover 14.

[0076] S7: After the oil injection is completed, remove the temporary oil return pipe 16. After wiping the oil return connection pipe 9 and the measuring pipe 4 clean, reinstall the measuring pipe 4 to the oil return connection pipe 9 in its original position.

[0077] Further, when the oil injection tooling pipe 30 is used for oil level measurement, as Figure 6 shown, the following steps are included:

[0078] T1: Wipe the measuring head 2 clean before use;

[0079] T2: Open the measuring head protection cover 1 and open the on-off valve 3 on the measuring head 2.

[0080] T3: After wiping the oil level measuring end of the oil level gauge 21 clean, slowly place the oil level measuring end into the lubricating oil circulation tank 20. While lowering it, wipe the oil level gauge clean. After the oil level measuring end reaches the bottom, slowly retract the oil level gauge to record the reading, and wipe the oil on the oil level gauge clean.

[0081] T4: After the measurement is completed, cover the measuring head protection cover 1.

[0082] In summary, the present invention provides a marine main engine oil injection tooling pipe and a usage method. The oil injection tooling pipe can be used for oil level measurement or oil injection, and includes an oil return connection pipe and a measuring pipe. The oil return connection pipe is connected to the lubricating oil circulation tank. When performing oil level measurement, the oil level gauge passes through the measuring pipe and the oil return connection pipe and enters the lubricating oil circulation tank, and the oil level is measured by reading the oil level gauge; when performing oil injection, remove the measuring pipe, connect the temporary oil return pipe to the upper end of the oil return connection pipe, and the oil in the lubricating oil circulation tank enters the pipeline to be cleaned under the drive of the oil pump. The oil after cleaning directly returns to the lubricating oil circulation tank through the temporary filter, the temporary oil return pipe and the oil return connection pipe, forming a cycle. The entire oil injection system does not pass through the main engine and has no connection with the main engine, so that the installation of the main engine and the oil injection work of the main lubricating oil pipeline system can be constructed simultaneously without mutual restriction, thereby shortening the oil injection cycle for the main engine. At the same time, it will not cause pollution to the inside of the main engine and keep the internal components clean. A three-way regulating valve is provided on the side wall of the oil return connection pipe for connecting a particle counter, so as to measure the oil quality while injecting oil.

[0083] The fuel injection tooling pipe is reasonably designed, small in volume, simple to operate and reusable, integrating fuel injection and oil level measurement, eliminating the mutual restriction during the simultaneous construction of the installation of the main engine and the fuel injection of the main lubricating oil pipe system. The use of particle size detection equipment has changed the previous situation of judging the quality of fuel injection by eyes and experience, saving the time for fuel injection inspection and acceptance (2 - 7 days). The increase in the bottom pipe diameter of the oil level measurement pipe facilitates cleaning, reduces pollution sources such as rust at the welded joints of the penetration parts, and plays a great role in shortening the fuel injection cycle of the main engine.

[0084] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A fuel injection tooling pipe for marine main engine, Characterized in that, The fuel injection tooling pipe includes: An oil return connecting pipe, the lower end of the oil return connecting pipe is connected to the upper surface of the lubricating oil circulation tank; A measuring pipe, the lower end of the measuring pipe is connected to the upper end of the oil return connecting pipe; When measuring the oil level, the oil level measuring end of the oil level gauge passes through the measuring pipe and the oil return connecting pipe and enters the lubricating oil circulation tank, and the oil level is measured by reading the oil level gauge; when fuel injection is carried out, the measuring pipe is removed, and a temporary oil return pipe is connected to the upper end of the oil return connecting pipe. The oil in the lubricating oil circulation tank enters the pipeline to be cleaned under the drive of the oil pump, and the cleaned oil directly returns to the lubricating oil circulation tank through the temporary filter, the temporary oil return pipe and the oil return connecting pipe to form a cycle; The lower end of the measuring pipe is connected with an upper flange, the upper end of the oil return connecting pipe is connected with a lower flange, and a plurality of quick locking bolts are arranged on the outer periphery of the lower flange to be hermetically connected with the upper flange or the temporary oil return pipe, and a sealing gasket is also arranged between the upper flange and the lower flange; The upper end of the measuring pipe is connected with a measuring head with a switch valve. When measuring the oil level, the switch valve is opened, and the switch valve is closed after the measurement is completed; A three-way regulating valve is arranged on the side wall of the oil return connecting pipe, and the three ports of the three-way regulating valve are respectively connected to the oil return connecting pipe, a pressure gauge and an oil inlet joint; the upper surface of the lubricating oil circulation tank is also communicated with an oil return joint. When measuring the particle size of the oil, the oil inlet joint, the particle detection instrument and the oil return joint are sequentially communicated through a hose, so that the oil flows back to the lubricating oil circulation tank after passing through the particle detection instrument, thereby completing the particle size measurement.

2. The fuel injection tooling pipe according to claim 1, Characterized in that: It further includes a measuring head protection cover, which is covered on the upper opening of the measuring head for dust protection.

3. The fuel injection tooling pipe according to claim 1, Characterized in that: The particle detection instrument is a particle counter.

4. The fuel injection tooling pipe according to claim 1, Characterized in that: The oil inlet joint and the oil return joint are equipped with joint protection covers for dust protection.

5. The fuel injection tooling pipe according to claim 1, Characterized in that: The pipeline to be cleaned includes a plurality of branches, and each branch finally converges to the lubricating oil main pipe and then enters the temporary filter for filtration.

6. A method for using the fuel injection tooling pipe according to claim 1, Characterized in that, The fuel injection tooling pipe is used for fuel injection or oil level measurement. When the fuel injection tooling pipe is used for fuel injection, it includes the following steps: S1: Hang the temporary filter near the fuel injection tooling pipe; S2: Connect the temporary oil return pipe to the oil return connecting pipe and fix and lock it with quick locking bolts; S3: After the pipeline and pipe accessories for main engine fuel injection are installed, the oil pump runs for 1-2 minutes, stops the pump, checks whether there is any oil leakage in the whole fuel injection pipeline, and promptly handles it to ensure no leakage; after confirming normal, the oil pump runs for fuel injection; S4: After oil injection for a certain period of time, when the impurity particles on the filter paper of the temporary filter are significantly few, conduct an oil quality test. Remove the joint protection cover, clean the oil inlet joint and connect the particle detection instrument through the oil inlet hose; connect one end of the return oil hose to the cleaned return oil joint and the other end to the particle detection instrument; S5: After the pressure gauge is installed, open the three-way regulating valve to control its outlet pressure below 0.6 MPa. Open the return oil joint, and conduct particle size detection after the pressure stabilizes. After passing the detection, conduct acceptance inspection; S6: After the particle size detection is completed, remove the particle detection instrument and the hose. After wiping the oil stains on the oil inlet joint and the return oil joint clean, cover the joint protection cover; S7: After the oil injection is completed, remove the temporary return oil pipe. After wiping the return oil connection pipe and the measuring pipe clean, reinstall the measuring pipe to the return oil connection pipe in place.

7. The oil injection tooling pipe according to claim 6, wherein, when the oil injection tooling pipe is used for oil level measurement, the following steps are further included: T1: Wipe the measuring head clean before use; T2: Open the measuring head protection cover and the switch valve on the measuring head; T3: Wipe the oil level measuring end of the oil level gauge clean, then slowly place the oil level measuring end into the lubricating oil circulation tank. While lowering, wipe the oil level gauge clean. After the oil level measuring end reaches the bottom, slowly retract the oil level gauge to take a reading and record it, and wipe the oil on the oil level gauge clean; T4: After the measurement is completed, cover the measuring head protection cover.

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