A marine engine piston ring friction and wear test device

Abstract

The present invention discloses a friction and wear test device for a marine engine piston ring, which relates to the technical field of wear test devices and includes a piston assembly, a cylinder liner assembly, and a driving assembly. The piston assembly includes a piston body and a piston ring connected to each other. The cylinder liner assembly includes a cylinder liner and a wear detection member connected to each other. The cylinder liner abuts against the piston ring. The combustion product injection assembly includes an air compressor, a liquid tank, an infusion pipe, a solenoid valve, a control box, and an atomizing nozzle. The solenoid valve is provided on the infusion pipe and is used to control the on-off of the solution injection. The two ends of the infusion pipe are respectively connected to the liquid tank and the atomizing nozzle. The air compressor is connected to the solenoid valve and is used to drive the fuel combustion product solution in the liquid tank to be atomized from the atomizing nozzle and sprayed onto the friction area between the piston ring and the cylinder liner. The control box is used to control the action time and interval of the solenoid valve. The wear detection member detects the influence of the products generated by the combustion of low-carbon fuel on the friction and wear performance of the piston ring-cylinder liner, providing a technical basis for the design and production of piston rings for marine low-carbon fuel engines.

Description

Technical Field

[0001] The present invention relates to the technical field of wear test devices, and particularly relates to a friction and wear test device for piston rings of marine engines. Background Art

[0002] High efficiency, reliability, long life, and intelligence are one of the development directions of modern marine engines. The piston ring is one of the key components in the combustion chamber of a marine engine, and its main functions are to seal, scrape oil, and distribute oil between the piston and the cylinder liner. Due to the harsh working conditions of the piston ring, excessive friction and wear of the piston ring are likely to occur, resulting in a decrease in the sealing performance between the piston ring and the cylinder liner. High-temperature and high-pressure combustion gas will leak into the crankcase, and an excessively high oil mist concentration may also cause serious faults such as crankcase explosion. The leakage of in-cylinder combustion gas will also reduce the output power of the engine and increase the fuel consumption rate. Therefore, it is necessary to invent a test device for testing the friction and wear of piston rings to detect the wear performance of piston rings and provide a technical basis for the design and production of piston rings for marine low-carbon fuel engines.

[0003] To achieve the "low-carbon and zero-carbon" strategy, marine engines have begun to use low-carbon fuels such as methanol, hydrogen, and ammonia as their fuels. The combustion products of methanol, hydrogen, and ammonia contain water. Among them, methanol is miscible with water and is weakly acidic, and ammonia is miscible with water and is weakly alkaline. This poses a major challenge to the friction and wear performance of the piston rings of marine engines that originally used diesel or heavy oil. The combustion product water will cause changes in the viscosity of the lubricating oil, thereby affecting the formation of the oil film between the piston ring and the cylinder liner. Mixtures such as ammonia water and methanol water have certain corrosiveness, which will corrode the piston ring coating and the cylinder liner, and exacerbate the friction and wear of the piston ring. Therefore, conducting research on the friction and wear test of piston rings for marine low-carbon fuel engines and studying the friction and wear performance of different piston ring-cylinder liner materials under the combustion products of new energy low-carbon fuels have very important research significance and engineering practical value.

[0004] However, the existing piston ring friction and wear test devices are mainly used to study the friction and wear performance of piston rings of marine diesel engines, and cannot make the piston ring contact the combustion products of low-carbon fuels, nor can they study the influence of the combustion products of low-carbon fuels on the friction and wear performance of piston rings. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a friction and wear test device for piston rings of marine engines, so as to solve the technical problem that the existing piston ring friction and wear test device cannot make the piston ring contact the combustion products of low-carbon fuels and cannot study the influence of the combustion products of low-carbon fuels on the friction and wear performance of piston rings.

[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a friction and wear test device for a marine engine piston ring, comprising:

[0008] A piston assembly, including a piston body and a piston ring connected thereto;

[0009] A cylinder liner assembly, including a cylinder liner and a wear detection member connected thereto, the cylinder liner abuts against the piston ring, and the wear detection member is used to detect the friction and wear performance of the piston ring; and

[0010] A combustion product injection assembly, including an air compressor, a liquid tank, an infusion pipe, an electromagnetic valve, a control box and an atomizing nozzle, the electromagnetic valve is arranged on the infusion pipe and is used to control the on-off of the solution injection, both ends of the infusion pipe are respectively connected to the liquid tank and the atomizing nozzle, the air compressor is connected to the electromagnetic valve, the air compressor is used to drive the fuel combustion product solution in the liquid tank to be atomized from the atomizing nozzle and sprayed onto the friction area between the piston ring and the cylinder liner, and the control box is used to control the opening and closing of the electromagnetic valve.

[0011] In some embodiments, the test device further includes a driving assembly, the driving assembly includes a first driving mechanism and a second driving mechanism, the first driving mechanism is slidably connected to the piston body and is used to drive the piston ring to approach or depart from the cylinder liner, and the second driving mechanism is connected to the piston body and is used to drive the piston ring to slide to generate friction with the cylinder liner.

[0012] In some embodiments, it further includes a support platform, the first driving mechanism further includes a servo motor, a lead screw, a first slide rail and a sliding frame arranged on the support platform, the sliding frame is slidably arranged on the first slide rail along a first direction, the servo motor is connected to the sliding frame through the lead screw, and can drive the sliding frame and the piston ring to reciprocate along the first direction, the piston body is slidably connected to the sliding frame along a second direction, and the second direction is perpendicular to the first direction.

[0013] In some embodiments, the second driving mechanism includes a variable-frequency motor, a coupling, a crank and a connecting rod, the variable-frequency motor is connected to the crank through the coupling, one end of the connecting rod is rotatably connected to the crank, and the other end is rotatably connected to the piston body.

[0014] In some embodiments, the second driving mechanism further includes a position sensor, the position sensor is connected to the electromagnetic valve, and is used to generate a sensing signal when the crank rotates to a preset position, the position sensor can control the electromagnetic valve to open according to the sensing signal, and can close the electromagnetic valve when the crank deviates from the preset position.

[0015] In some embodiments, it further includes an oil replenishing component. An oil hole is formed in the cylinder liner. One end of the oil hole is connected to the oil replenishing component, and the other end of the oil hole communicates with the friction surface of the cylinder liner.

[0016] In some embodiments, the cylinder liner assembly further includes an orbit and a force sensor. The orbit is arranged on the support platform, and the force sensor is arranged at the bottom of the cylinder liner. The piston ring can drive the cylinder liner to slide up and down along the orbit through friction, and the force sensor is used to measure the frictional force between the two when the piston ring rubs against the cylinder liner.

[0017] In some embodiments, the wear detection component is a magnetoresistive sensor. The surface of the piston ring has a coating, and it abuts against the cylinder liner through the coating. The piston ring can gradually approach the magnetoresistive sensor when the coating wears, so that the measured magnetic induction intensity of the external magnetic field increases.

[0018] In some embodiments, the cylinder liner assembly further includes a heating rod and a thermocouple sensor arranged inside the cylinder liner. The heating rod is used to heat the cylinder liner, and the thermocouple sensor is used to detect the temperature of the cylinder liner.

[0019] In some embodiments, the cylinder liner assembly further includes an elastic member. A clamping groove is formed on the outer wall of the piston body, the elastic member is arranged in the clamping groove, the piston ring is sleeved in the clamping groove and connected to the elastic member, and the piston ring can drive the elastic member to accumulate elastic force when it abuts against the cylinder liner.

[0020] Compared with the prior art, the marine engine piston ring friction and wear test device provided by the present invention can simulate the products generated by the contact of the piston ring - cylinder liner during the combustion of low - carbon fuels, such as solutions of methanol - water, ammonia - water, etc. When the air compressor is working, it can drive the solution to pass through the infusion pipe and spray from the atomizing nozzle to the friction area between the piston ring and the cylinder liner, so as to facilitate detecting the influence of the products generated by the combustion of low - carbon fuels on the friction and wear performance of the piston ring - cylinder liner through the wear detection component, providing a technical basis for the design and production of piston rings for marine low - carbon fuel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the marine engine piston ring friction and wear test device provided by the embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the signal sensing assembly provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In order to solve the technical problem that the piston ring friction and wear test device in the prior art cannot study the influence of the combustion products of low-carbon fuels on the friction and wear performance of piston rings, the present invention provides a marine engine piston ring friction and wear test device, which can realize spraying the products of low-carbon fuel combustion (such as methanol-water, ammonia-water and other solutions) onto the friction area between the piston ring and the cylinder liner, so as to test the influence of the combustion products of low-carbon fuels on the friction and wear performance of the piston ring-cylinder liner, and provide a technical basis for the design and production of piston rings for marine low-carbon fuel engines.

[0025] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a marine engine piston ring friction and wear test device in an embodiment of the present invention. The marine engine piston ring friction and wear test device 100 includes a piston assembly, a cylinder liner assembly and a driving assembly. The piston assembly includes a piston body 11 and a piston ring 12 connected to each other. The cylinder liner assembly includes a cylinder liner 21 and a wear detection member connected to each other. An installation hole is provided in the middle of the cylinder liner 21, and the wear detection member is arranged in the installation hole. The cylinder liner 21 abuts against the piston ring 12. The piston ring 12 can friction with the cylinder liner 21 on both sides of the installation hole. The wear detection member can detect the friction and wear performance of the piston ring 12 when the piston ring 12 approaches. The driving assembly includes a first driving mechanism 31 and a second driving mechanism 32. The first driving mechanism 31 is slidably connected to the piston body 11 and is used to drive the piston ring 12 to approach or move away from the cylinder liner 21. When the piston ring 12 approaches the cylinder liner 21, the friction force between the piston ring 12 and the cylinder liner 21 gradually increases, and vice versa gradually decreases. When the piston ring 12 is separated from the cylinder liner 21, there is no friction force between the two. The second driving mechanism 32 is connected to the piston body 11 and is used to drive the piston ring 12 to reciprocate and slide to generate friction with the cylinder liner 21, simulating the actual working state of the piston ring 12.

[0026] It should be emphasized that the friction surface of the cylinder liner 21 is arc-shaped, the piston ring 12 is ring-shaped, and it approaches or moves away from the friction surface along its radial direction. The piston ring 12 only generates friction with the friction surface of the cylinder liner 21 through its outer wall part.

[0027] In one of the embodiments, please refer to Figure 1, further comprising a support platform 1. The first driving mechanism 31 further includes a servo motor 311, a lead screw 312, a first slide rail 313, and a sliding frame 314 provided on the support platform 1. The sliding frame 314 is slidably arranged on the first slide rail 313 in the first direction. The servo motor 311 is threadedly connected to the sliding frame 314 through the lead screw 312 and can drive the sliding frame 314 and the piston ring 12 to reciprocate in the first direction. The piston body 11 is slidably connected to the sliding frame 314 in the second direction, and the second direction is perpendicular to the first direction. In this embodiment, the first driving mechanism 31 is mainly used to adjust the load between the piston ring 12 and the cylinder liner 21, and the second driving mechanism 32 is mainly used to drive the piston ring 12 to reciprocate relative to the cylinder liner 21 so as to generate friction between the piston ring 12 and the cylinder liner 21. The servo motor 311 can drive the lead screw 312 to rotate, so that the lead screw 312 drives the sliding frame 314 to reciprocate along the first slide rail 313 by means of threaded cooperation. By means of the transmission of the lead screw 312, the position of the sliding frame 314 and the piston body 11 in the first direction can be precisely controlled, thereby precisely controlling the acting force between the piston ring 12 and the cylinder liner 21. When the second driving mechanism 32 drives the piston body 11 to reciprocate in the second direction, the load between the piston ring 12 and the cylinder liner 21 can be precisely controlled, so as to accurately test the friction and wear performance of the piston ring 12 and the cylinder liner 21 under different friction force conditions.

[0028] In one embodiment, please refer to Figure 1 , further comprising a combustion product injection assembly. The combustion product injection assembly includes an air compressor 41, a liquid tank 42, an infusion tube 43, a solenoid valve 44, and an atomizing nozzle 45. The solenoid valve 44 is provided on the infusion tube 43 and is used to control the on-off of the infusion tube 43. The two ends of the infusion tube 43 are respectively connected to the liquid tank 42 and the atomizing nozzle 45. The air compressor 41 is connected to the liquid tank 42 and is used to drive the combustion product solution in the liquid tank 42 to pass through the infusion tube 43 and spray from the atomizing nozzle 45 towards the cylinder liner 21. In this embodiment, the low-carbon fuel can be low-carbon or carbon-free fuels such as methanol, hydrogen, and ammonia. The air compressor 41 can pressurize the liquid tank 42 to drive the solution in the liquid tank 42 to spray from the atomizing nozzle 45 onto the friction surface between the piston ring 12 and the cylinder liner 21, so as to simulate the influence of the combustion products of low-carbon fuels on the friction and wear performance of the piston ring-cylinder liner. The solenoid valve 44 is equivalent to a switch and is used to control the on-off of the infusion tube 43 to control whether the atomizing nozzle 45 outputs fuel to the friction surface or not.

[0029] In one embodiment, please refer to Figure 1The second driving mechanism 32 includes a variable frequency motor 321, a coupling 322, a crank 323 and a connecting rod 324. The variable frequency motor 321 is connected to the crank 323 through the coupling 322, and can be used to drive the crank 323 to rotate continuously in one direction. One end of the connecting rod 324 is rotatably connected to the crank 323, and the other end of the connecting rod 324 is rotatably connected to the piston body 11. When the crank 323 rotates, it can drive the connecting rod 324 to rotate, so as to drive the piston body 11 to reciprocate up and down through the connecting rod 324. The second driving mechanism can be understood as the piston-cylinder liner structure of the ship's engine. When working, it drives the piston ring 12 to reciprocate to rub against the cylinder liner 21 to simulate the actual working state of the piston ring 12.

[0030] In one embodiment, see Figure 1 The second driving mechanism 32 further includes a position sensor 325, which is connected to the control box 2, and the control box 2 is connected to the solenoid valve 44 and can control the solenoid valve 44 to open or close. The position sensor 325 is used to generate a sensing signal when the crank 323 rotates to a preset position, and transmit the sensing signal to the control box 2. The control box 2 can control the solenoid valve 44 to open according to the sensing signal, and can close the solenoid valve 44 when the crank 323 is out of the preset position. In this embodiment, when the crank 323 rotates to the preset position, the solenoid valve 44 opens, and the atomizing nozzle 45 sprays the fuel product solution toward the friction surface between the piston ring 12 and the cylinder liner 21, which can more realistically simulate the working environment of the piston ring 12 and improve the authenticity of the test.

[0031] In one embodiment, see Figure 1 , and also includes an oil replenishing assembly. The cylinder sleeve 21 is provided with an oil hole 211. One end of the oil hole 211 is connected to the oil replenishing assembly, and the other end of the oil hole 211 is connected to the friction surface of the cylinder sleeve 21. In this embodiment, the oil replenishing assembly stores lubricating oil and is used to supply lubricating oil to the friction surface to simulate the actual working environment of the piston ring 12 and the cylinder sleeve 21, which is conducive to improving the accuracy of data detection. The oil replenishing assembly includes a peristaltic pump 51, an oil tank 52 and an oil pipe 53. One end of the oil pipe 53 is connected to the peristaltic pump 51, and the other end of the oil pipe 53 is connected to the oil hole 211. The peristaltic pump 51 is connected to the oil tank 52 and can drive the lubricating oil stored in the oil tank 52 to be output to the oil hole 211 through the oil pipe 53 during operation. The lubricating oil then flows to the friction surface through the oil hole 211 to simulate the actual working environment of the friction surface.

[0032] The cylinder liner assembly also includes a track (not shown in the figure) and a force sensor 23. The track is arranged on the supporting platform 1, and the cylinder liner 21 is slidably connected to the track. The force sensor 23 is arranged at the bottom of the cylinder liner 21. The piston ring 12 can drive the cylinder liner 21 to slide up and down along the track through friction. The force sensor 23 is used to test the friction between the two when the piston ring 12 rubs downward on the cylinder liner 21.

[0033] In one embodiment, please refer to Figure 1 , the cylinder liner assembly further includes a force sensor 23. The force sensor 23 is connected to the cylinder liner 21 and is used to measure the frictional force between the piston ring 12 and the cylinder liner 21 when the piston ring 12 rubs against the cylinder liner 21. In this embodiment, when the piston ring 12 moves downward, the piston ring 12 applies a frictional force to the cylinder liner 21, and this frictional force can drive the cylinder liner 21 to move downward. The force sensor 23 bears not only the gravity of the cylinder liner 21 but also the frictional force of the piston ring 12 on the cylinder liner 21. Since the gravity of the cylinder liner 21 is known, the frictional force of the friction surface can be obtained by subtracting the gravity of the cylinder liner 21 from the force borne by the force sensor 23. In addition, the track can limit the left and right movement of the cylinder liner 21, and the cylinder liner 21 can only slide up and down along the track, which can improve the stability of the up and down sliding of the cylinder liner 21.

[0034] In one embodiment, please refer to Figure 1 , the wear detection component is a magnetoresistive sensor. The surface of the piston ring 12 has a coating and abuts against the cylinder liner 21 through the coating. The piston ring 12 can gradually approach the magnetoresistive sensor when the coating wears. The piston ring 12 can be made of a magnetically conductive material such as cast iron so that the magnetoresistive sensor can generate magnetic induction when the piston ring 12 approaches. Specifically, the magnetoresistive sensor measures the magnetic induction intensity of the applied magnetic field and converts it into an output voltage to measure the wear of the piston ring - cylinder liner. As the coating of the piston ring 12 and the cylinder liner gradually wear, the piston ring 12 approaches the magnetoresistive sensor (the piston ring 12 is connected to the piston body 11 through an elastic member), and the magnetic induction intensity of the applied magnetic field measured by the magnetoresistive sensor increases, and the output voltage increases, so as to reflect the wear condition between the piston ring 12 and the cylinder liner 21. In this embodiment, a receiving space is provided in the middle part of the cylinder liner 21, and the magnetoresistive sensor is installed in the receiving space. The piston ring 12 will pass by the magnetoresistive sensor every time it moves up and down, and the coating can generate magnetic induction with the magnetoresistive sensor. As the coating wears, the thickness of the coating changes, and coatings with different thicknesses generate different magnetic induction intensities with the magnetoresistive sensor. Generally, the greater the wear of the coating, the greater the magnetic induction intensity generated by the piston ring 12 and the magnetoresistive sensor. The magnetoresistive sensor can also be connected to a signal conditioning box and connected to a computer through the signal conditioning box. The signal conditioning box can convert the magnetic induction intensity generated by the magnetoresistive sensor into an output voltage, and the tester can measure the wear degree of the coating by watching the voltage parameters displayed on the computer.

[0035] In one embodiment, please refer to Figure 1, the cylinder liner assembly further includes a heating rod 24 and a thermocouple sensor 25 disposed inside the cylinder liner 21. The heating rod 24 is used to heat the cylinder liner 21, and the thermocouple sensor 25 is used to detect the temperature of the cylinder liner 21. In this embodiment, the number of heating rods 24 is four, and they are all spaced apart inside the cylinder liner 21 in an embedded manner to facilitate uniform heating of the cylinder liner 21. Through the cooperative operation of the thermocouple sensor 25 and the heating rod 24, the cylinder liner 21 can be heated to a preset temperature so that the piston ring 12 and the cylinder liner 21 can perform a friction and wear test at the actual working condition temperature, which is beneficial to improving the accuracy of the test and has more reference value.

[0036] In one embodiment, please refer to Figure 1 , the cylinder liner assembly further includes an elastic member 26. A clamping groove is formed on the outer wall of the piston body 11. The elastic member 26 is disposed in the clamping groove. The piston ring 12 is sleeved in the clamping groove and connected to the elastic member 26. When the piston ring 12 abuts against the cylinder liner 21, it can drive the elastic member 26 to accumulate elastic force. In this embodiment, the elastic member 26 drives the piston ring 12 to abut against the cylinder liner 21 through elastic force, which can drive the piston ring 12 to closely abut against the cylinder liner 21, improve the stability of friction, and also avoid the acting force between the piston ring 12 and the cylinder liner 21 from being a rigid force. The elastic member 26 can be a spring. When the piston ring 12 is worn to a certain extent, the spring can release elastic force and elongate, driving the piston ring 12 to continue to closely abut against the cylinder liner 21, so as to facilitate the piston ring 12 to perform friction and wear tests for a relatively large number of times.

[0037] In one embodiment, please refer to Figure 2 , the friction and wear test device for a marine engine piston ring further includes a signal sensing assembly. The signal sensing assembly includes an optical encoder 3, a signal conditioning box 4, a magnetoresistive sensor 5, a power supply 6, a collector 7, and a computer 8. The magnetoresistive sensor 5 is connected to the signal conditioning box 4. The signal conditioning box 4 is connected to the power supply 6 and the collector 7. The collector 7 is connected to the computer 8 and the optical encoder 3. The optical encoder 3 is connected to the power supply 6. The power supply 6 is used to supply power to the optical encoder 3 and the signal conditioning box 4.

[0038] The optical encoder 3 is used to collect the top dead center signal to determine the period. The magnetoresistive sensor 5 is used to generate a magnetoresistive signal with the piston ring 12 through electromagnetic induction and transmit the magnetoresistive signal to the signal conditioning box 4 for sorting. The collector 7 is used to collect the signals of the optical encoder 3 and the signal conditioning box 4 and transmit the signals to the computer 8 to process and display the final information for the test personnel to view.

[0039] The outer wall of the piston body 11 in this embodiment can be sleeved with a plurality of piston rings 12. The plurality of piston rings 12 are simultaneously abutted against the cylinder liner 21 and generate friction with the cylinder liner 21 at the same time, so as to simulate the working conditions of the plurality of piston rings 12. In addition, the magnetoresistive sensor 5 is detachably installed on the cylinder liner 21 by screws through the bracket 9, so as to facilitate the subsequent replacement of the magnetoresistive sensor.

[0040] For a better understanding of the present invention, the following is combined with Figures 1 to 2 The technical solution of the present invention will be described in detail:

[0041] The first driving mechanism 31 included in the piston ring friction and wear test device for marine engines provided by the present invention can drive the piston ring 12 to approach or move away from the cylinder liner 21 when sliding, so as to adjust the frictional force between the piston ring 12 and the cylinder liner 21. The second driving mechanism 32 can drive the piston ring 12 to slide to generate friction with the cylinder liner 21, so as to simulate the actual working environment and working state of the piston ring 12. Finally, the friction and wear performance of the piston ring 12 can be detected by the wear detection piece, so as to record the friction and wear performance of the piston ring 12 under different frictional forces, providing a solid technical foundation for the design and production of piston rings for marine low-carbon fuel engines.

[0042] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A friction and wear test device for a marine engine piston ring, characterized in that, Comprising: A piston assembly, including a piston body and a piston ring connected to each other; A cylinder liner assembly, including a cylinder liner and a wear detection member connected to each other, the cylinder liner abuts against the piston ring, and the wear detection member is used to detect the friction and wear performance of the piston ring; and A combustion product injection assembly, including an air compressor, a liquid tank, an infusion pipe, a solenoid valve, a control box, and an atomizing nozzle, the solenoid valve is provided on the infusion pipe and is used to control the on-off of the solution injection, both ends of the infusion pipe are respectively connected to the liquid tank and the atomizing nozzle, the air compressor is connected to the solenoid valve, the air compressor is used to drive the fuel combustion product solution in the liquid tank to be atomized from the atomizing nozzle and sprayed towards the friction area between the piston ring and the cylinder liner, and the control box is used to control the opening and closing of the solenoid valve; A driving assembly, including a second driving mechanism, the second driving mechanism is connected to the piston body and is used to drive the piston ring to slide to generate friction with the cylinder liner; The second driving mechanism includes a variable-frequency motor, a coupling, a crank, and a connecting rod, the variable-frequency motor is connected to the crank through the coupling, one end of the connecting rod is rotatably connected to the crank, and the other end is rotatably connected to the piston body; The second driving mechanism further includes a position sensor, the position sensor is connected to the control box, and is used to generate a sensing signal when the crank rotates to a preset position, the position sensor can control the solenoid valve to open according to the sensing signal, and can close the solenoid valve when the crank disengages from the preset position.

2. The marine engine piston ring friction and wear test device according to claim 1, characterized in that, The driving assembly includes a first driving mechanism, the first driving mechanism is slidably connected to the piston body and is used to drive the piston ring to approach or move away from the cylinder liner.

3. The marine engine piston ring friction and wear test device according to claim 2, characterized in that, It further includes a support platform, the first driving mechanism further includes a servo motor, a lead screw, a first slide rail, and a sliding frame provided on the support platform, the sliding frame is slidably provided on the first slide rail along a first direction, the servo motor is connected to the sliding frame through the lead screw, and can drive the sliding frame and the piston ring to reciprocate along the first direction, the piston body is slidably connected to the sliding frame along a second direction, and the second direction is perpendicular to the first direction.

4. The marine engine piston ring friction and wear test device according to claim 1, characterized in that, It further includes an oil replenishing assembly, the cylinder liner is provided with an oil hole, one end of the oil hole is connected to the oil replenishing assembly, and the other end of the oil hole communicates with the friction surface of the cylinder liner.

5. The marine engine piston ring friction and wear test device according to claim 3, characterized in that, The cylinder liner assembly further includes a track and a force sensor, the track is provided on the support platform and is slidably connected to the cylinder liner, the force sensor is provided at the bottom of the cylinder liner, the piston ring can drive the cylinder liner to slide up and down along the track through friction, and the force sensor is used to measure the friction force between the two when the piston ring rubs the cylinder liner downward.

6. The marine engine piston ring friction and wear test device according to claim 1, characterized in that, The wear detection member is a magnetoresistive sensor, the surface of the piston ring has a coating, and abuts against the cylinder liner through the coating, and the piston ring can gradually approach the magnetoresistive sensor when the coating wears, so that the magnetic induction intensity of the measured external magnetic field increases.

7. The marine engine piston ring friction and wear test device according to claim 6, characterized in that, The cylinder liner assembly further includes a heating rod and a thermocouple sensor disposed inside the cylinder liner. The heating rod is used to heat the cylinder liner, and the thermocouple sensor is used to detect the temperature of the cylinder liner.

8. The marine engine piston ring friction and wear test device according to claim 1, characterized in that, The cylinder liner assembly further includes an elastic member. A clamping groove is formed on the outer wall of the piston body. The elastic member is disposed in the clamping groove. The piston ring is sleeved in the clamping groove and connected to the elastic member. When the piston ring abuts against the cylinder liner, the elastic member can be driven to accumulate elastic force.

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