Friction-wear test device for piston ring of marine engine

Abstract

The invention discloses a friction-wear test device for a piston ring of a marine engine, and relates to the technical field of wear test devices, the friction-wear test device comprises a piston assembly, a cylinder sleeve assembly and a driving assembly, and the piston assembly comprises a piston body and a piston ring which are connected. The cylinder sleeve assembly comprises a cylinder sleeve and an abrasion detection piece which are connected, the cylinder sleeve abuts against the piston ring, the combustion product spraying assembly comprises an air compressor, a liquid tank, a liquid conveying pipe, an electromagnetic valve, a control box and an atomization spray head, the electromagnetic valve is arranged on the liquid conveying pipe and used for controlling on-off of solution spraying, and the two ends of the liquid conveying pipe are connected with the liquid tank and the atomization spray head respectively; the air compressor is connected with the electromagnetic valve and used for driving a fuel combustion product solution in the liquid tank to be atomized from the atomizing spray head and sprayed to a friction area of the piston ring and the cylinder sleeve, the control box is used for controlling the action time and interval of the electromagnetic valve, and the abrasion detection piece detects the influence of products generated by combustion of low-carbon fuel on the friction and abrasion performance of the piston ring and the cylinder sleeve. And a technical basis is provided for design and production of the piston ring of the marine low-carbon fuel engine.

Description

Technical Field

[0001] The invention relates to the technical field of wear test devices, and in particular to a friction and wear test device for a marine engine piston ring. 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 of the combustion chamber of a marine engine. Its main function is to seal, scrape 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 is prone to occur, which reduces the sealing between the piston ring and the cylinder liner. High-temperature and high-pressure gas will leak into the crankcase. Excessive oil mist concentration may also cause severe faults such as crankcase explosion. The leakage of gas in the cylinder 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 the piston ring to detect the wear performance of the piston ring and provide a technical basis for the design and production of piston rings for marine low-carbon fuel engines.

[0003] In order 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. Methanol and water are mutually soluble in weak acid, and ammonia and water are mutually soluble in weak 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 change the viscosity of the lubricating oil, thereby affecting the formation of the oil film between the piston ring and the cylinder liner. The mixture of ammonia water and methanol water has a certain degree of corrosiveness, which will corrode the piston ring plating and cylinder liner, and aggravate the friction and wear of the piston ring. Therefore, it is of great research significance and engineering practical value to carry out friction and wear test research on the piston ring of marine low-carbon fuel engines and study the friction and wear performance of different piston ring-cylinder liner materials under the combustion products of new energy low-carbon fuels.

[0004] However, the existing piston ring friction and wear test equipment is mainly used to study the friction and wear performance of the piston ring of a marine diesel engine. It is impossible to make the piston ring contact with the combustion products of low-carbon fuels, and it is impossible to study the influence of the combustion products of low-carbon fuels on the friction and wear performance of the piston ring. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a marine engine piston ring friction and wear test device to solve the technical problem that the piston ring friction and wear test device in the prior art cannot make the piston ring contact with the low-carbon fuel combustion products and cannot study the influence of the low-carbon fuel combustion products on the friction and wear performance of the piston ring.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a marine engine piston ring friction and wear test device, comprising: A piston assembly, comprising a piston body and a piston ring connected to each other; A cylinder liner assembly, comprising a cylinder liner and a wear detection member connected to each other, the cylinder liner abutting against the piston ring, the wear detection member being used to detect the friction and wear performance of the piston ring; and The combustion product injection assembly includes an air compressor, a liquid tank, a liquid infusion pipe, a solenoid valve, a control box and an atomizing nozzle. The solenoid valve is arranged on the liquid infusion pipe and is used to control the on and off of the solution injection. The two ends of the liquid 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 toward the friction area between the piston ring and the cylinder liner. The control box is used to control the opening and closing of the solenoid valve.

[0007] In some embodiments, the test device also includes a drive assembly, which includes a first drive mechanism and a second drive mechanism, wherein the first drive 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, and the second drive mechanism is connected to the piston body and is used to drive the piston ring to slide to generate friction with the cylinder liner.

[0008] In some embodiments, a support platform is also included, and the first driving mechanism also includes a servo motor, a lead screw, a first slide rail and a sliding frame arranged on the support platform. The sliding frame is arranged on the first slide rail and slides 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 slide back and forth along the first direction. The piston body is connected to the sliding frame in a sliding manner along a second direction, and the second direction is perpendicular to the first direction.

[0009] 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 rotationally connected to the crank, and the other end is rotationally connected to the piston body.

[0010] In some embodiments, the second drive mechanism also includes a position sensor, which is connected to the solenoid valve and is used to generate a sensing signal when the crank rotates to a preset position. The position sensor can control the opening of the solenoid valve according to the sensing signal, and can close the solenoid valve when the crank leaves the preset position.

[0011] In some embodiments, an oil replenishing assembly is further included, 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 is connected to the friction surface of the cylinder liner.

[0012] In some embodiments, the cylinder liner assembly also includes a track and a force sensor, the track is arranged on the support platform, 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 track through friction force, and the force sensor is used to test the friction force between the two when the piston ring rubs against the cylinder liner.

[0013] In some embodiments, the wear detection component is a magnetoresistive sensor, the surface of the piston ring has a coating, and the coating abuts against the cylinder liner. When the coating wears, the piston ring can gradually approach the magnetoresistive sensor to increase the magnetic induction intensity of the measured external magnetic field.

[0014] In some embodiments, the cylinder liner assembly further includes a heating rod and a thermocouple sensor disposed inside the cylinder liner, the heating rod being used to heat the cylinder liner, and the thermocouple sensor being used to detect the temperature of the cylinder liner.

[0015] In some embodiments, the cylinder liner assembly also includes an elastic member, a groove is formed on the outer wall of the piston body, the elastic member is arranged in the groove, the piston ring is sleeved in the groove and connected to the elastic member, and the piston ring can drive the elastic member to accumulate elastic force when abutting against the cylinder liner.

[0016] Compared with the prior art, the marine engine piston ring friction and wear test device provided by the present invention can simulate the contact between the piston ring and the cylinder liner with the products produced by the combustion of low-carbon fuels, such as methanol-water, ammonia-water and other solutions. When the air compressor is working, it can drive the solution through the infusion tube and spray it from the atomizing nozzle to the friction area between the piston ring and the cylinder liner, so as to detect the influence of the products produced by the combustion of low-carbon fuels on the friction and wear performance of the piston ring and the cylinder liner through the wear detection part, thereby providing a technical basis for the design and production of piston rings of marine low-carbon fuel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a marine engine piston ring friction and wear testing device provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the signal sensing component provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0019] 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 low-carbon fuel combustion products on the friction and wear performance of the piston ring, the present invention provides a marine engine piston ring friction and wear test device, which can spray the products of low-carbon fuel combustion (such as methanol-water, ammonia-water and other solutions) into the friction area between the piston ring and the cylinder liner to test the influence of the low-carbon fuel combustion products on the friction and wear performance of the piston ring-cylinder liner, thereby providing a technical basis for the design and production of piston rings for marine low-carbon fuel engines.

[0020] See also Figure 1 , Figure 1 The structure diagram of the marine engine piston ring friction and wear test device in one embodiment of the present invention is shown in FIG. The marine engine piston ring friction and wear test device 100 includes a piston assembly, a cylinder liner assembly and a drive 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 component connected to each other. A mounting hole is provided in the middle of the cylinder liner 21, and the wear detection component is arranged in the mounting hole. The cylinder liner 21 abuts against the piston ring 12. The piston ring 12 can rub against the cylinder liner 21 on both sides of the mounting hole. The wear detection component can detect the friction and wear performance of the piston ring 12 when the piston ring 12 approaches. The drive assembly includes a first drive mechanism 31 and a second drive mechanism 32. The first drive 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 between the piston ring 12 and the cylinder liner 21 gradually increases, and vice versa. When the piston ring 12 is separated from the cylinder liner 21, there is no friction 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 slide back and forth to generate friction with the cylinder sleeve 21 to simulate the actual working state of the piston ring 12 .

[0021] It should be emphasized that the friction surface of the cylinder liner 21 is in the shape of an arc surface, and the piston ring 12 is in the shape of a ring and approaches or moves away from the friction surface in its radial direction. The piston ring 12 generates friction with the friction surface of the cylinder liner 21 only through its outer wall portion.

[0022] In one embodiment, see Figure 1, further comprising a support platform 1, the first driving mechanism 31 further comprising a servo motor 311, a screw rod 312, a first slide rail 313 and a slide frame 314 arranged on the support platform 1, the slide frame 314 slides along the first direction and is arranged on the first slide rail 313, the servo motor 311 is threadedly connected to the slide frame 314 through the screw rod 312, and can drive the slide frame 314 and the piston ring 12 to slide back and forth along the first direction, the piston body 11 is slidably connected to the slide frame 314 along 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 sleeve 21, and the second driving mechanism 32 is mainly used to drive the piston ring 12 to reciprocate relative to the cylinder sleeve 21, so that friction is generated between the piston ring 12 and the cylinder sleeve 21. The servo motor 311 can drive the screw rod 312 to rotate so that the screw rod 312 drives the sliding frame 314 to slide back and forth along the first sliding rail 313 through threaded cooperation. The position of the sliding frame 314 and the piston body 11 in the first direction can be precisely controlled through the transmission of the screw rod 312, so as to precisely control the force between the piston ring 12 and the cylinder sleeve 21. When the second driving mechanism 32 drives the piston body 11 to slide back and forth in the second direction, the load between the piston ring 12 and the cylinder sleeve 21 can be precisely controlled, so as to accurately test the friction and wear performance of the piston ring 12 and the cylinder sleeve 21 under different friction conditions.

[0023] In one embodiment, see Figure 1 , and also includes a combustion product injection assembly, which includes an air compressor 41, a liquid tank 42, a liquid delivery pipe 43, a solenoid valve 44 and an atomizing nozzle 45. The solenoid valve 44 is arranged on the liquid delivery pipe 43 and is used to control the on and off of the liquid delivery pipe 43. The two ends of the liquid delivery pipe 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 liquid delivery pipe 43 and spray from the atomizing nozzle 45 toward the cylinder sleeve 21. In this embodiment, the low-carbon fuel can be a low-carbon or carbon-free fuel 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 toward the friction surface between the piston ring 12 and the cylinder sleeve 21 to simulate the influence of the low-carbon fuel combustion products on the friction and wear performance of the piston ring-cylinder sleeve. The solenoid valve 44 is equivalent to a switch, and is used to control the on-off of the liquid delivery tube 43, so as to control the atomizing nozzle 45 to output or not output fuel to the friction surface.

[0024] In one embodiment, see 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In one embodiment, see Figure 1 The cylinder liner assembly also includes a force sensor 23, which is connected to the cylinder liner 21 and is used to test the friction between the two 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 friction force to the cylinder liner 21, and the friction force can drive the cylinder liner 21 to move downward. In addition to bearing the gravity of the cylinder liner 21, the force sensor 23 also bears the friction force of the piston ring 12 on the cylinder liner 21. Since the gravity of the cylinder liner 21 is known, the friction force of the friction surface can be obtained by subtracting the gravity of the cylinder liner 21 from the bearing force detected 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.

[0029] In one embodiment, see Figure 1 , the wear detection part is a magnetoresistive sensor, the surface of the piston ring 12 has a coating, and the coating abuts the cylinder sleeve 21, and the piston ring 12 can gradually approach the magnetoresistive sensor when the coating wears. The piston ring 12 can be made of magnetic conductive materials 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 wear of the piston ring-cylinder sleeve by measuring the magnetic induction intensity of the external magnetic field and converting it into an output voltage. As the coating of the piston ring 12 and the cylinder sleeve 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), the magnetic induction intensity of the external magnetic field measured by the magnetoresistive sensor increases, and the output voltage increases, thereby reflecting the wear between the piston ring 12 and the cylinder sleeve 21. In this embodiment, a receiving space is provided in the middle part of the cylinder sleeve 21, and the magnetoresistive sensor is installed in the receiving space. The piston ring 12 passes through 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. Coatings of different thicknesses have different magnetic induction intensities generated by 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. The tester can measure the degree of wear of the coating by viewing the voltage parameters displayed on the computer.

[0030] In one embodiment, see Figure 1The cylinder liner assembly also 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, there are four heating rods 24, which are all embedded and spaced inside the cylinder liner 21 to facilitate uniform heating of the cylinder liner 21. Through the cooperation 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 be subjected to friction and wear tests at actual operating temperatures, which is conducive to improving the accuracy of the test and has more reference value.

[0031] In one embodiment, see Figure 1 The cylinder sleeve assembly also includes an elastic member 26. A slot is provided on the outer wall of the piston body 11. The elastic member 26 is provided in the slot. The piston ring 12 is sleeved in the slot and connected to the elastic member 26. When the piston ring 12 abuts against the cylinder sleeve 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 sleeve 21 through elastic force, which can drive the piston ring 12 to abut against the cylinder sleeve 21 tightly, improve the stability of friction, and also avoid the force between the piston ring 12 and the cylinder sleeve 21 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 the elastic force and stretch, driving the piston ring 12 to continue to abut against the cylinder sleeve 21 tightly, so that a larger number of friction and wear tests of the piston ring 12 can be performed.

[0032] In one embodiment, see Figure 2 The marine engine piston ring friction and wear test device also includes a signal sensing component, which includes a photoelectric 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 photoelectric encoder 3, the photoelectric encoder 3 is connected to the power supply 6, and the power supply 6 is used to power the photoelectric encoder 3 and the signal conditioning box 4.

[0033] The photoelectric encoder 3 is used to collect the top dead center signal to determine the cycle. The magnetic resistance sensor 5 is used to generate a magnetic resistance signal through electromagnetic induction with the piston ring 12, and transmit the magnetic resistance signal to the signal conditioning box 4 for sorting. The collector 7 is used to collect the signals of the photoelectric 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.

[0034] The outer wall of the piston body 11 of this embodiment can be sleeved with multiple piston rings 12, and the multiple piston rings 12 abut against the cylinder sleeve 21 at the same time, and generate friction with the cylinder sleeve 21, so as to simulate the working conditions of multiple piston rings 12. In addition, the magnetoresistive sensor 5 is detachably mounted on the cylinder sleeve 21 by means of screws through the bracket 9, so as to facilitate the subsequent replacement of the magnetoresistive sensor.

[0035] In order to better understand the present invention, the following Figure 1 to Figure 2 The technical solution of the present invention is described in detail: The marine engine piston ring friction and wear test device provided by the present invention includes a first driving mechanism 31 that can drive the piston ring 12 to approach or move away from the cylinder liner 21 when sliding, so as to adjust the friction 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 part to record the friction and wear performance of the piston ring 12 under different friction forces, providing a solid technical foundation for the design and production of piston rings for marine low-carbon fuel engines.

[0036] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A marine engine piston ring friction and wear test device, characterized in that: include: A piston assembly, comprising a piston body and a piston ring connected to each other; A cylinder liner assembly, comprising a cylinder liner and a wear detection member connected to each other, the cylinder liner abutting against the piston ring, and the wear detection member being used to detect the friction and wear performance of the piston ring; and The combustion product injection assembly includes an air compressor, a liquid tank, a liquid infusion pipe, a solenoid valve, a control box and an atomizing nozzle. The solenoid valve is arranged on the liquid infusion pipe and is used to control the on and off of the solution injection. The two ends of the liquid 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 toward the friction area between the piston ring and the cylinder liner. The control box is used to control the opening and closing of the solenoid valve.

2. The marine engine piston ring friction and wear testing device according to claim 1, characterized in that: The test device also includes a drive assembly, which includes a first drive mechanism and a second drive mechanism. The first drive 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. The second drive mechanism is connected to the piston body and is used to drive the piston ring to slide to generate friction with the cylinder liner.

3. The marine engine piston ring friction and wear testing device according to claim 2, characterized in that: It also includes a supporting platform, and the first driving mechanism also includes a servo motor, a lead screw, a first slide rail and a sliding frame arranged on the supporting platform, the sliding frame is arranged on the first slide rail and slides 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 slide back and forth along the first direction, the piston body is connected to the sliding frame in a sliding manner along a second direction, and the second direction is perpendicular to the first direction.

4. The marine engine piston ring friction and wear testing device according to claim 2, characterized in that: 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.

5. The marine engine piston ring friction and wear testing device according to claim 4, characterized in that: The second driving mechanism also includes a position sensor, which 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 leaves the preset position.

6. The marine engine piston ring friction and wear testing device according to claim 1, characterized in that: It also includes an oil replenishing assembly. The cylinder sleeve 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 is connected to the friction surface of the cylinder sleeve.

7. The marine engine piston ring friction and wear testing device according to claim 3, characterized in that: The cylinder liner assembly also includes a track and a force sensor. The track is arranged on the supporting platform and is slidably connected to the cylinder liner. 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 track through friction. The force sensor is used to test the friction force between the two when the piston ring rubs downward against the cylinder liner.

8. The marine engine piston ring friction and wear testing device according to claim 1, characterized in that: The wear detection component is a magnetoresistive sensor. The surface of the piston ring has a coating and abuts against the cylinder liner through the coating. When the coating wears, the piston ring can gradually approach the magnetoresistive sensor to increase the magnetic induction intensity of the measured external magnetic field.

9. The marine engine piston ring friction and wear testing device according to claim 8, characterized in that: The cylinder liner assembly also 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.

10. The marine engine piston ring friction and wear testing device according to claim 1, characterized in that: The cylinder sleeve assembly also includes an elastic member, a slot is formed on the outer wall of the piston body, the elastic member is arranged in the slot, the piston ring is sleeved in the slot and connected to the elastic member, and the piston ring can drive the elastic member to accumulate elastic force when abutting against the cylinder sleeve.

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