Crankshaft inner oil passage permeability detection device

Abstract

This application discloses a crankshaft internal oil passage permeability testing device, belonging to the field of crankshaft oil passage testing equipment. It includes a crankshaft mounting part and a lubricating oil supply assembly. The crankshaft mounting part includes a platform with several journal connection parts. Each journal connection part includes a journal seat and a journal cover. The journal seat has a lower annular groove in the middle of its inner side, and the journal cover has an upper annular groove in the middle of its inner side. The bottom of the lower annular groove has an oil drain hole, which is connected to the main oil drain pipe via a drain branch pipe. The lubricating oil supply assembly includes an oil inlet connector, which is inserted into the oil hole at the front end of the crankshaft. The oil inlet connector, crankshaft, main oil drain pipe, and lubricating oil supply assembly form a closed-loop lubricating oil circuit. This application uses a detachable and snap-fit ​​method to fix the crankshaft journals, facilitating quick connection. By opening the drain branch pipe valves one by one through the closed-loop oil circuit, the permeability of the corresponding oil passage can be directly and accurately observed through the observation pipe.

Description

Technical Field

[0001] This application belongs to the field of crankshaft oil passage testing equipment, specifically relating to a crankshaft internal oil passage permeability testing device. Background Technology

[0002] As a core transmission component of various power machinery such as engines, compressors, and marine power plants, the crankshaft is a key carrier for the conversion and transmission of mechanical energy. Its operating condition directly determines the reliability and service life of the entire power system. During the high-speed operation of power machinery, the crankshaft journals must withstand enormous cyclic loads and frictional forces. The pre-designed oil passages inside the crankshaft bear the core function of lubricating oil delivery. They must not only accurately deliver clean lubricating oil to key friction parts such as the main journals and connecting rod journals to form a stable oil film to reduce direct metal-to-metal contact and achieve lubrication and friction reduction, but also carry away the heat generated by friction in the journals through the circulation of lubricating oil, preventing local overheating that could lead to softening of the journal material, accelerated wear, or even thermal deformation. Even minor blockages in the crankshaft's internal oil passages can disrupt the normal oil circulation path. At best, this leads to insufficient oil supply to the target journal, resulting in a thinner or broken oil film and abnormal friction between the journal and bearing, causing scratches and other damage. At worst, it causes complete blockage of the oil passages, trapping the journal in a dry friction state, leading to severe burning, adhesion, and even crankshaft seizure, forcing an emergency shutdown of the entire power system. Such faults are not only costly to repair but can also trigger a chain reaction of damage. For example, a blocked engine crankshaft can render the piston and connecting rod assembly unusable, while a crankshaft failure in an industrial compressor can cause a complete production line shutdown, resulting in significant economic losses for the company. Therefore, a comprehensive and reliable permeability test of the crankshaft's internal oil passages is a crucial step in the manufacturing and maintenance of power machinery. However, the current mainstream crankshaft oil passage inspection methods in the industry still remain at a relatively primitive level of manual operation: most companies rely on disassembly and manual observation of oil traces at the oil passage inlet and outlet, or use simple continuity tests, such as introducing low-pressure compressed air and judging whether the airflow is unobstructed by sound. This inspection method has obvious limitations: on the one hand, manual observation of oil traces cannot accurately determine the internal continuity of the oil passage. If there is a minor blockage or local narrowing of the oil passage, the oil trace may still cover the outlet, leading the inspector to misjudge it as unobstructed; on the other hand, simple continuity tests lack quantitative standards. The volume and presence of airflow sound are easily affected by environmental noise, and different inspectors have different auditory sensitivity and judgment experience, which can easily lead to misjudgments due to subjective experience bias. For example, a novice inspector may misjudge a slight blockage causing a decrease in airflow as normal, while an experienced inspector may miss a hidden blockage due to fatigue. These misjudgments will create serious safety hazards for the subsequent operation of the power machinery. Utility Model Content

[0003] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a crankshaft internal oil passage permeability testing device. This application uses a detachable and snap-fit ​​method to fix the crankshaft journal, which is convenient and quick to connect. The oil drain branch valves are opened one by one through the closed-loop oil circuit, and the permeability of the corresponding oil passage is observed intuitively and accurately through the observation tube.

[0004] The technical solution adopted by this application to solve its existing problems is: A crankshaft internal oil passage permeability testing device includes a crankshaft mounting section and a lubricating oil supply assembly.

[0005] The crankshaft mounting section includes a platform and an oil drain manifold. The platform is provided with several journal connecting parts. Each journal connecting part includes a detachable journal seat and a journal cover that are interlocked with each other. The journal seat has a lower annular groove in the middle of its inner side, and the journal cover has an upper annular groove in the middle of its inner side. The lower annular groove and the upper annular groove are arranged opposite to each other. The bottom of the lower annular groove has a second oil drain hole, which is connected to the oil drain manifold through an oil drain branch pipe.

[0006] The lubricating oil supply assembly is connected to the drain manifold. The lubricating oil supply assembly includes an oil inlet connector, which is inserted into the oil hole at the front end of the crankshaft. The oil inlet connector, crankshaft, drain manifold, and lubricating oil supply assembly form a closed-loop lubricating oil circuit.

[0007] Preferably, a valve is connected in series on the drain branch pipe, and a transparent observation tube is provided on the drain branch pipe, with the observation tube located between the valve and the main drain pipe.

[0008] Preferably, the lubricating oil supply assembly includes an oil tank and an oil pump connected to each other. The oil pump outlet is connected to an oil inlet connector via a pipeline, and the oil drain manifold is connected to the oil tank via a pipeline.

[0009] Preferably, a filter is provided between the main drain pipe and the oil tank. The filter is connected to the main drain pipe via a filter inlet pipe and to the oil tank via a filter outlet pipe.

[0010] Preferably, the filter includes a shell with an open top, an annular filter screen, and a cover.

[0011] The bottom of the housing is a frustum, and the center of the frustum is provided with an oil inlet hole that is connected to the oil inlet pipe of the filter. A support ring is provided on the inner wall of the housing near the upper end. The inner wall of the housing above the support ring is provided with threads. The first oil drain hole is provided on the side wall of the housing.

[0012] The annular filter screen is coaxially inserted inside the housing. The top surface of the annular filter screen is higher than or flush with the top surface of the support ring. The bottom of the annular filter screen is bent inward with an inner bend cover, which covers the bottom of the truncated cone.

[0013] The cover has a retaining ring protruding from the bottom, and the outer wall of the retaining ring has threads. The retaining ring is inserted into the inside of the housing and the two are threaded together. The upper end of the cover has a hexagonal head protruding from it.

[0014] Preferably, the platform is provided with a vertical plate, the vertical plate is threaded with bolts, the vertical plate is provided with a through hole, the oil inlet connector passes through the through hole, the oil inlet connector is fitted with a top plate and an abutment plate, and the end of the bolt abuts against the abutment plate.

[0015] After the front end of the oil inlet connector is inserted into the center oil hole of the crankshaft front end shaft, the top plate abuts against the end face of the crankshaft front end shaft.

[0016] Preferably, the oil pump is connected to the oil inlet pipe via an oil pump outlet pipe and a hose. A three-way valve is connected in series on the oil pump outlet pipe, and one of the inlets of the three-way valve is connected to the high-pressure air inlet pipe.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: (1) High-pressure lubricating oil is supplied through the lubricating oil supply assembly to form a closed-loop lubricating oil circuit. Then, the valves on the drain branch pipe are opened in sequence, and the lubricating oil flow is observed through the observation pipe to determine whether the oil passage is unobstructed. This method can intuitively and accurately determine the permeability of the oil passage in the crankshaft, avoiding the problem of poor reliability caused by human experience judgment.

[0018] (2) The journal connection of the crankshaft mounting section adopts a detachable connection and interlocking journal seat and journal cover, and the arc of the contact surface with the crankshaft journal is 180°, which can well support and fix the crankshaft. At the same time, it is fixed by bolts, making installation and disassembly very convenient. In addition, the platform is provided with multiple threaded holes to facilitate the adjustment of the position of the journal seat, which can accommodate crankshafts of different specifications.

[0019] (3) After the front end of the oil inlet connector is inserted into the center oil hole of the crankshaft front end shaft, the top plate abuts against the end face of the crankshaft front end shaft. The contact surface between the top plate and the crankshaft front end shaft is made of rubber material. After deformation due to compression, the sealing effect can be optimized to prevent lubricating oil leakage. The annular groove formed by the journal seat and journal cover is arranged corresponding to the oil hole on the crankshaft journal, which also helps to improve the sealing performance.

[0020] (4) A three-way valve is connected in series on the oil pump outlet pipe in the lubricating oil supply assembly. By adjusting the internal passage of the three-way valve, lubricating oil or high-pressure air can be discharged through the oil inlet connector. This not only detects whether the crankshaft oil passage is blocked, but also cleans the oil passage, reducing the impact of impurities in the oil passage on the test results and the normal operation of the crankshaft.

[0021] (5) A transparent observation tube is provided on the oil drain branch pipe to facilitate observation of the flow of lubricating oil and thus determine whether the oil passage is unobstructed. In addition, the filter is designed to facilitate the filtration of lubricating oil, and the filter structure is reasonably designed. The annular filter screen can be removed for cleaning by periodically unscrewing the cover. Under the action of the inner bend cover, the filtered debris will not remain in the housing after the filter screen is removed, which is convenient for maintenance and upkeep.

[0022] (6) A mudguard is fixed to the bottom of the oil tank to prevent sediment from flowing into the oil inlet of the oil pump, thus ensuring the cleanliness of the lubricating oil sucked in by the oil pump. The flange baffle installed on the platform is slidably connected to the platform and fixed by T-bolts, which can abut against the crankshaft output end, further improving the stability of the crankshaft during the testing process. Attached Figure Description

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the crankshaft internal oil passage permeability testing device after installation on the crankshaft, as described in this application. Figure 2 This is a structural diagram of the crankshaft mounting section in a crankshaft internal oil passage permeability testing device according to this application. Figure 3 for Figure 2 The exploded diagram, Figure 4 This is a structural diagram of the lubricating oil supply assembly in a crankshaft internal oil passage permeability testing device according to this application. Figure 5 This is a cross-sectional view of the oil tank in the crankshaft internal oil passage permeability testing device of this application. Figure 6 This is a cross-sectional view of the filter in a crankshaft internal oil passage permeability testing device according to this application. Figure 7 This is an exploded view of the filter in the crankshaft internal oil passage permeability testing device of this application.

[0025] In the diagram: 1-oil tank, 101-mudguard, 2-oil pump, 3-oil pump inlet pipe, 4-oil pump outlet pipe, 5-three-way valve, 6-high-pressure air inlet pipe, 7-oil inlet connector, 701-top plate, 702-butt plate, 8-support plate, 9-support leg, 10-filter drain pipe, 11-filter inlet pipe, 12-filter, 1201-housing, 12011-first drain hole, 12012-support ring, 12013-frustum base, 1202-ring filter screen, 1202 1-Inner bend cover, 1203-Cover, 12031-Snap ring, 12032-Hex head, 13-Platform, 14-Flange baffle, 15-Upright plate, 16-Bolt, 17-Journal seat, 1701-Lower ring groove, 1702-Second oil drain hole, 18-Journal cover, 1801-Upper ring groove, 19-Support frame, 20-Oil drain branch pipe, 21-Valve, 22-Observation pipe, 23-Oil drain main pipe, 24-Crankshaft, 2401-Crankshaft front end shaft, 2402-Crankshaft output end. Detailed Implementation

[0026] The attached figure shows the preferred embodiment of the crankshaft internal oil passage permeability testing device. The following is a more detailed description of this application in conjunction with the attached figure.

[0027] Depend on Figures 1 to 7 As shown, a crankshaft internal oil passage permeability testing device includes a crankshaft mounting part and a lubricating oil supply assembly.

[0028] The crankshaft mounting section is used to support and fix the crankshaft 24, and the oil supply assembly is used to provide high-pressure oil and detect whether the oil holes inside the crankshaft are blocked.

[0029] The crankshaft mounting section includes a platform 13 and an oil drain manifold 23. The platform 13 has several journal connection sections, each including a detachably connected and interlocking journal seat 17 and journal cover 18. The arc of the contact surfaces between the journal seat 17, the journal cover 18, and the crankshaft 24 journals is 180°. The main journals and connecting rod journals of the crankshaft 24 are mounted on the journal seat 17, and then the journal cover 18 is fastened to it, securing the journal cover 18 to the journal seat 17 with bolts.

[0030] The journal seat 17 has a lower annular groove 1701 in the middle of its inner side, and the journal cover 18 has an upper annular groove 1801 in the middle of its inner side. The lower annular groove 1701 and the upper annular groove 1801 are arranged opposite to each other and are fastened together to form a 360° annular groove, which is arranged corresponding to the oil hole on the journal of the crankshaft 24.

[0031] The journal seat 17 is connected to the platform 13 via a support frame 19. The support frame 19 is fixedly connected to the platform 13 by bolts. The platform 13 has multiple threaded holes, which facilitates the adjustment of the position of the journal seat 17.

[0032] The bottom of the lower annular groove 1701 is provided with a second oil drain hole 1702, which is connected to the main oil drain pipe 23 through the oil drain branch pipe 20.

[0033] A valve 21 is connected in series on the oil drain branch pipe 20, and a transparent observation tube 22 is provided on the oil drain branch pipe 20. The observation tube 22 is located between the valve 21 and the main oil drain pipe 23.

[0034] The lubricating oil supply assembly is connected to the oil drain manifold 23. The lubricating oil supply assembly includes an oil inlet connector 7, which is inserted into the oil hole at the front end of the crankshaft 2401. The oil inlet connector 7, crankshaft 24, oil drain manifold 23 and lubricating oil supply assembly form a closed-loop lubricating oil circuit.

[0035] In use, the lubricating oil supply assembly supplies pressurized lubricating oil to the oil passage inside the crankshaft 24 through the oil inlet connector 7. Then, the valves 21 on each drain branch pipe 20 are opened in sequence, with only one valve 21 of the drain branch pipe 20 opened at a time. The flow of lubricating oil through the observation pipe 22 of the drain branch pipe 20 is observed to determine whether the corresponding oil passage inside the crankshaft 24 is unobstructed, thus completing the test of the permeability of the oil passage inside the crankshaft.

[0036] Finally, open all valves 21 and flush the oil passages inside the crankshaft for 5-10 minutes.

[0037] The lubricating oil supply assembly includes an oil tank 1 and an oil pump 2 connected to each other. The oil tank 1 and the oil pump 2 are fixed on a support plate 8 with support legs 9. The oil outlet end of the oil pump 2 is connected to an oil inlet connector 7 through a pipeline, and the oil drain manifold 23 is connected to the oil tank 1 through a pipeline.

[0038] Furthermore, the oil pump 2 is connected to the oil inlet connector 7 via the oil pump outlet pipe 4 and a hose. A three-way valve 5 is connected in series on the oil pump outlet pipe 4, and one inlet of the three-way valve 5 is connected to the high-pressure air intake pipe 6. By adjusting the internal passage of the three-way valve 5, lubricating oil or high-pressure air can be discharged from the oil inlet connector 7, the crankshaft oil passage can be checked for blockage, and it can be cleaned at the same time.

[0039] A filter 12 is provided between the main oil drain pipe 23 and the oil tank 1. The filter 12 is connected to the main oil drain pipe 23 through the filter inlet pipe 11 and to the oil tank 1 through the filter outlet pipe 10.

[0040] The filter 12 includes a housing 1201 with an open top, an annular filter screen 1202, and a cover 1203.

[0041] The bottom of the housing 1201 is a frustum 12013. The center of the frustum 12013 is provided with an oil inlet hole that is connected to the filter oil inlet pipe 11. A support ring 12012 is provided on the inner wall of the housing 1201 near the upper end. The inner wall of the housing 1201 above the support ring 12012 is provided with threads. The first oil drain hole 12011 is provided on the side wall of the housing 1201.

[0042] The annular filter screen 1202 is coaxially inserted inside the housing 1201. The top surface of the annular filter screen 1202 is higher than or flush with the top surface of the support ring 12012. The bottom of the annular filter screen 1202 is bent inward to form an inner curved cover 12021, which covers the frustum base 12013. The inner curved cover 12021 has a through hole in the middle that is larger than the oil inlet hole at the center of the frustum base 12013.

[0043] The cover 1203 has a retaining ring 12031 protruding from the bottom. The outer wall of the retaining ring 12031 is threaded. The retaining ring 12031 is inserted into the housing 1201 and the two are threadedly connected. The upper end of the cover 1203 has a hexagonal head 12032 protruding from the top.

[0044] Lubricating oil enters from below, then flows through the annular filter 1202 into the gap between the annular filter 1202 and the housing 1201, before being discharged through the first oil drain hole 12011. Periodically, the cover 1203 is unscrewed, and the annular filter 1202 is removed for cleaning. Due to the action of the inner curved cover 12021, metal shavings and other particles adhering to the inner wall of the annular filter 1202 are trapped by the inner curved cover 12021. Therefore, after removing the annular filter 1202, filtered debris will not remain inside the housing 1201.

[0045] The filter drain pipe 10 and the oil pump inlet pipe 3 at the oil pump 2 inlet are located at opposite ends inside the oil tank 1. A mudguard 101 is fixed to the bottom surface inside the oil tank 1, with its height below the liquid level and close to the oil pump inlet pipe 3. The mudguard 101 serves to prevent sediment inside the oil tank 1 from flowing into the oil pump inlet pipe 3. The top of the oil tank 1 is equipped with a vent and a filler neck, and a detachable observation window is located on the side wall of the oil tank 1 at a position corresponding to the mudguard 101.

[0046] The platform 13 is provided with a vertical plate 15, and a bolt 16 is threadedly connected to the vertical plate 15. The vertical plate 15 is provided with a through hole, and an oil inlet connector 7 passes through the through hole. A top plate 701 and an abutment plate 702 are fitted on the oil inlet connector 7, and the end of the bolt 16 abuts against the abutment plate 702.

[0047] Rotate bolt 16 to adjust the position of the front end of oil inlet connector 7. After the front end of oil inlet connector 7 is inserted into the center oil hole of crankshaft front shaft 2401, top plate 701 abuts against the end face of crankshaft front shaft 2401. The contact surface between top plate 701 and crankshaft front shaft 2401 is made of rubber material, which optimizes the sealing effect after deformation due to compression.

[0048] A flange baffle 14 is provided on the platform 13. The flange baffle 14 is slidably connected to the platform 13 and fixed by T-bolts, and abuts against the crankshaft output end 2402.

[0049] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A device for detecting the permeability of oil passages inside a crankshaft, characterized in that: This includes the crankshaft mounting section and the lubricating oil supply assembly; The crankshaft mounting section includes a platform (13) and an oil drain manifold (23). The platform (13) is provided with several journal connecting parts. The journal connecting parts include a detachable and interlocking journal seat (17) and a journal cover (18). The journal seat (17) has a lower annular groove (1701) in the middle of its inner side, and the journal cover (18) has an upper annular groove (1801) in the middle of its inner side. The lower annular groove (1701) and the upper annular groove (1801) are arranged opposite to each other. The bottom of the lower annular groove (1701) is provided with a second oil drain hole (1702). The second oil drain hole (1702) is connected to the oil drain manifold (23) through an oil drain branch pipe (20). The lubricating oil supply assembly is connected to the drain manifold (23). The lubricating oil supply assembly includes an oil inlet connector (7), which is connected to the oil hole at the front end of the crankshaft front end shaft (2401). The oil inlet connector (7), crankshaft (24), drain manifold (23) and lubricating oil supply assembly form a closed-loop lubricating oil circuit.

2. The crankshaft internal oil passage permeability testing device according to claim 1, characterized in that: A valve (21) is connected in series on the drain branch pipe (20), and a transparent observation tube (22) is provided on the drain branch pipe (20). The observation tube (22) is located between the valve (21) and the drain main pipe (23).

3. A crankshaft internal oil passage permeability testing device according to claim 1 or 2, characterized in that: The lubricating oil supply assembly includes an oil tank (1) and an oil pump (2) connected to each other. The oil pump (2) has an oil inlet connector (7) connected to the oil outlet end through a pipeline, and the oil drain manifold (23) is connected to the oil tank (1) through a pipeline.

4. The crankshaft internal oil passage permeability testing device according to claim 3, characterized in that: A filter (12) is provided between the main drain pipe (23) and the oil tank (1). The filter (12) is connected to the main drain pipe (23) through the filter inlet pipe (11) and to the oil tank (1) through the filter drain pipe (10).

5. The crankshaft internal oil passage permeability testing device according to claim 4, characterized in that: The filter (12) includes a housing (1201) with an open top, an annular filter screen (1202), and a cover (1203). The bottom of the housing (1201) is a frustum bottom (12013), and the center of the frustum bottom (12013) is provided with an oil inlet hole that is connected to the filter oil inlet pipe (11). A support ring (12012) is provided on the inner wall of the housing (1201) near the upper end. The inner wall of the housing (1201) above the support ring (12012) is provided with threads. The first oil drain hole (12011) is provided on the side wall of the housing (1201). The annular filter (1202) is coaxially inserted inside the housing (1201). The top surface of the annular filter (1202) is higher than or flush with the top surface of the support ring (12012). The bottom of the annular filter (1202) is bent inward to form an inner bend cover (12021), which covers the bottom of the frustum (12013). The cover (1203) has a retaining ring (12031) protruding from the bottom. The retaining ring (12031) has threads on its outer wall. The retaining ring (12031) is inserted into the housing (1201) and the two are threaded together. The cover (1203) has a hexagonal head (12032) protruding from the upper end.

6. A crankshaft internal oil passage permeability testing device according to claim 1, 2, 4, or 5, characterized in that: The platform (13) is provided with a vertical plate (15), and a bolt (16) is threadedly connected to the vertical plate (15). The vertical plate (15) is provided with a through hole, and an oil inlet connector (7) passes through the through hole. A top plate (701) and an abutment plate (702) are fitted on the oil inlet connector (7). The end of the bolt (16) abuts against the abutment plate (702). After the front end of the oil inlet connector (7) is inserted into the center oil hole of the crankshaft front shaft (2401), the top plate (701) abuts against the end face of the crankshaft front shaft (2401).

7. A crankshaft internal oil passage permeability testing device according to claim 4 or 5, characterized in that: The oil pump (2) is connected to the oil inlet pipe (7) via the oil pump outlet pipe (4) and the hose. A three-way valve (5) is connected in series on the oil pump outlet pipe (4). One of the inlets of the three-way valve (5) is connected to the high-pressure air inlet pipe (6).

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