CN216433524U - Marine diesel engine sliding bearing abrasion monitoring device based on contact potential method - Google Patents

Abstract

The utility model relates to a wear monitoring device for a sliding bearing of a marine diesel engine based on a contact potential method, which comprises a mechanical supporting device, a signal extraction device and a signal analysis processing unit, wherein the mechanical supporting device comprises a machine body connecting piece, a crankshaft connector and a coupler; the signal leading-out device comprises a sleeve, a main shaft, a carbon brush and an encoder; the signal analysis processing unit comprises a contact potential leading-out closed loop and a crank angle signal processing circuit; the engine body connecting piece is arranged on the diesel engine body, and the sleeve is coaxially connected with the engine body connecting piece; one end of the crankshaft connector is connected with a crankshaft in the machine body connecting piece, and the other end of the crankshaft connector is connected with the main shaft; the carbon brush is arranged on the main shaft, is connected with a contact potential to lead out a closed loop and leads out the potentials of the crankshaft and the main shaft; the encoder is arranged on the main shaft, is used as an angle mark signal output device and is connected to the crank angle signal processing circuit. The utility model discloses compare in the thermoelectric effect method, improved the SNR, be convenient for extract bearing wear fault characteristic under the strong noise background.

Description

Marine diesel engine sliding bearing abrasion monitoring device based on contact potential method

Technical Field

The utility model belongs to the technical field of diesel engine equipment, concretely relates to marine diesel engine shafting slide bearing wear monitoring devices.

Background

The friction work loss of the engine caused by the bearings amounts to about 25% of the total friction loss, which can be up to 40% especially in high-strength engines. When the friction pair is seriously abraded, a series of serious accidents can occur, and the economical efficiency, the dynamic property and the reliability of the internal combustion engine are influenced.

The sliding bearing of the diesel engine is a position supporting and calibrating component of a crankshaft, the stress of the crankshaft is complex in the motion process, and the sliding bearing is easy to heat and wear under the action of alternating load which changes periodically in the working cycle of the diesel engine. The uneven excessive wear of the sliding bearing can increase the bearing clearance, cause the impact force of the journal to the sliding bearing to increase, and directly influence the overall working performance of the diesel engine; excessive wear of the sliding bearing can also cause rapid wear of a cylinder sleeve, a piston and a piston ring, so that the gas blowby and the consumption rate of fuel in a combustion chamber are increased, and the output power of a diesel engine is directly influenced. Serious bearing abrasion even can cause the occurrence of serious accidents such as crankshaft deformation, clasping and melting breakage, crankcase explosion and the like, not only can bring about great economic loss, but also can bring about great hidden dangers for the safe operation of the diesel engine.

At present, methods for monitoring the wear state of a bearing of a marine diesel engine mainly comprise an oil method, a temperature method, a vibration method, a strain method and the like, and due to the fact that a plurality of signal excitation sources are arranged in the diesel engine, the motion of movable parts is complex and the like, the methods cannot accurately position a specific fault sliding bearing in real time. Chinese patent CN102840983B proposes a device and method for monitoring wear of sliding bearings of marine diesel engines, which adopts high-precision transmitting and collecting components such as crankshaft adapters, elastic shock absorbers, slip ring transmitters, etc. to take thermoelectric signals generated by the crankshaft and the bearing bush due to the seebeck effect, and simultaneously perform careful and reasonable analysis on the thermoelectric signals, so as to accurately monitor the wear state of the sliding bearings in real time, and by combining and analyzing the abnormal thermoelectric signals and the corresponding ignition cylinder position, i.e. the position of the sliding bearings, the position of the faulty bearing can be determined. However, in the practical application process, the following disadvantages are found in the patent: (1) the collected thermoelectric signals are passive signals and are greatly influenced by electric leakage of other equipment of the diesel engine; (2) the centering degree of the crankshaft and the main shaft is not considered, and the coupler and the encoder are easy to damage in the long-term operation process.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in having the great and relatively poor problem of centering degree of signal interference to above-mentioned prior art, provides a marine diesel engine slide bearing wearing and tearing monitoring devices based on contact potential method, and the device can realize long-term accurate slide bearing trouble on-line monitoring.

The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:

a sliding bearing wear monitoring device of a marine diesel engine based on a contact potential method comprises a mechanical supporting device, a signal leading-out device and a signal analyzing and processing unit,

the mechanical supporting device comprises a machine body connecting piece, a crankshaft connector and a coupler; the signal leading-out device comprises a sleeve, and a main shaft, a carbon brush and an encoder which are arranged in the sleeve; the signal analysis processing unit comprises a contact potential leading-out closed loop and a crank angle signal processing circuit;

the engine body connecting piece is arranged on the diesel engine body, and the sleeve is coaxially and fixedly connected with the engine body connecting piece; one end of the crankshaft connector is positioned in the engine body connecting piece and is connected with a crankshaft of the diesel engine, and the other end of the crankshaft connector extends into the sleeve and is connected with the main shaft through a coupler; the carbon brush is arranged on the main shaft and is connected to the contact potential to lead out a closed loop and lead out the potentials of the crankshaft and the main shaft; the encoder is arranged on the main shaft, is used as an angle mark signal output device and is connected to the crank angle signal processing circuit.

In the above scheme, the monitoring device further comprises an auxiliary mounting tool centering device, and the crankshaft connector is connected with the crankshaft inside the machine body connecting piece through the centering device.

In the scheme, the centering device is of an annular structure, the inner hole of the centering device is matched with the crankshaft connector by the tolerance grade of IT6, and the outer diameter of the centering device is matched with the body connecting piece by the tolerance grade of IT 6; and a spigot is arranged between the crankshaft connector and the crankshaft to reduce the coaxiality error.

In the above scheme, the sleeve is of a three-section structure and comprises a signal leading-out device connecting piece, a base and a sensor cover body which are coaxially and sequentially arranged; the signal leading-out device connecting piece is coaxially and fixedly connected with the machine body connecting piece; the base is fixedly connected with the signal leading-out device connecting piece and is provided with a spigot; the sensor cover body is connected with the base through the middle supporting plate; the coupler is located inside the signal leading-out device connecting piece, the carbon brush is located inside the base, and the encoder is located inside the sensor cover body.

In the above scheme, the upper end and the lower end of the middle supporting plate are respectively connected with the sensor cover body and the inner thread of the base through outer threads, the outer diameter of the lower end of the middle supporting plate is smaller than that of the upper end of the middle supporting plate, and the middle supporting plate and the base are reinforced through screws.

In the above scheme, the front end of the main shaft is connected with the base through a front end support bearing, and the rear end of the main shaft is connected with the middle support plate through a rear end support bearing; nylon sleeves are arranged between the front end supporting bearing and the base and between the rear end supporting bearing and the middle supporting plate, so that insulation between the main shaft and the diesel engine body is guaranteed.

In the scheme, the rotor of the carbon brush is arranged on the main shaft, and the stator of the carbon brush is fixed on the base through an insulating screw; and a heat insulation plate is arranged between the carbon brush and the base, so that the heat of the machine body is prevented from being conducted to the carbon brush, and the electronic components are prevented from being damaged by high temperature.

In the above scheme, the contact potential leading-out closed loop comprises a direct current power supply E, a first resistor R and a second resistor R which are connected in series, wherein two ends of the first resistor R are connected with a voltmeter V, and the carbon brush is connected with the first resistor R in parallel.

In the scheme, the precision of the second resistor R is more than twice that of the first resistor R, and the sensitivity requirement of the contact signal is ensured.

In the above scheme, the diameter of the end of the crankshaft connector connected with the coupling is smaller than that of the end of the crankshaft connector connected with the crankshaft.

The beneficial effects of the utility model reside in that:

1. the utility model discloses based on the contact potential method monitors marine diesel engine slide bearing wearing and tearing state, compare in current thermoelectric effect method, improved the SNR, be convenient for draw the bearing wear fault characteristics under the strong noise background.

2. The utility model discloses a centralizer docks crankshaft connector and the inside bent axle of organism connecting piece, the centralizer adopts the mode in big or small aperture to reduce crankshaft connector and organism connecting piece's axiality error, centralizer hole and crankshaft connector cooperation adopt IT 6's tolerance level, the external diameter adopts IT 6's tolerance level with the organism connecting piece cooperation, the bent axle has been guaranteed, crankshaft connector and organism connecting piece's error, thereby the centering degree of main shaft and bent axle has been improved, monitoring system's reliability has been improved.

3. The utility model discloses a contact potential signal extraction device, when axle bush and bent axle contact, contact potential signal becomes 0V, can monitor marine diesel engine slide bearing's lubricated state accurately in real time, provides effectual protection means for the stable high-efficient operation of marine diesel engine main bearing. The position of the fault bearing can be directly judged by combining and analyzing the contact potential signal and the corresponding cylinder working moment, namely the bearing position. The method undoubtedly ensures the safe operation of the diesel engine, saves the maintenance time and the labor cost, and creates social benefits.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a cross-sectional view of the mechanical support device and the signal extraction device of the sliding bearing wear monitoring device of the marine diesel engine of the present invention;

FIG. 2 is a schematic diagram of the structure and usage of the centralizer of the sliding bearing wear monitoring device of the marine diesel engine of the present invention;

FIG. 3 is a schematic diagram of a contact potential leading-out closed loop of the sliding bearing wear monitoring device of the marine diesel engine of the present invention;

fig. 4 is a polar diagram of a bearing wear contact potential signal, wherein fig. 4-1 shows a contact potential in a normal state, fig. 4-2 shows a contact potential of a large-end bearing fault of a certain gear connecting rod, and fig. 4-3 shows a contact potential of a sliding bearing fault of a certain gear.

In the figure: 10. a mechanical support device; 11. a machine body connecting piece; 12. a crankshaft connector; 13. a coupling;

20. a signal extraction device; 21. a sleeve; 211. a signal lead-out device connector; 212. a base; 213. A sensor housing; 22. a main shaft; 23. a carbon brush; 24. an encoder; 25. a middle support plate; 26. a support bearing; 27. a nylon sleeve; 28. a heat insulation plate;

30. the contact potential leads out a closed loop; 31. bearing bushes; 32. a crankshaft; 33. lubricating oil; r1, a first resistor; v, a voltmeter; r2, a second resistor; E. a power source;

40. and (4) a centering device.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Under the condition of normal operation of the sliding bearing of the diesel engine shafting, a lubricating oil film is arranged between the crankshaft and the bearing bush for separation, thereby avoiding direct contact of two metals. Generally, the thickness of an oil film of a sliding bearing of a diesel engine is within the range of 0.1-1 mm, and the sliding bearing can be regarded as an insulator due to the lower conductivity of lubricating oil, but a micro-convex peak exists on the surface of a bearing bush and the surface of a crankshaft, the micro-convex peak can be contacted when the working condition is severe, and the crankshaft and the bearing bush are regarded as being communicated and are equipotential bodies each other when the micro-convex peak is contacted. Based on this, the utility model provides a marine diesel engine slide bearing wearing and tearing monitoring devices based on contact potential method, whether contact through judging bent axle and axle bush judges the wearing and tearing state of bearing. The device comprises a mechanical supporting device 10, a signal leading-out device 20 and a signal analyzing and processing unit, wherein the mechanical supporting device 10 ensures that the coaxiality precision of a crankshaft and the signal leading-out device 20 is high, and can stably support the signal leading-out device 20; the signal leading-out device 20 ensures that the crankshaft is connected with the circuit of the signal analysis processing unit to form a closed loop; the signal analysis processing unit analyzes and processes the signal extracted by the signal extraction device 20 to judge the wear state of the sliding bearing.

As shown in fig. 1, the mechanical support device 10 includes a body connecting member 11, a crankshaft connector 12, and a coupling 13; the signal extraction device 20 includes a sleeve 21, and a main shaft 22, a carbon brush 23, and an encoder 24 installed in the sleeve 21. The signal analysis processing unit includes a contact potential leading closed loop 30 and a crank angle signal processing circuit. The engine body connecting piece 11 is installed on the diesel engine body, and is made of stainless steel materials with high strength, so that the stable support of the signal leading-out device 20 is guaranteed. The sleeve 21 is coaxially and fixedly connected with the body connecting piece 11. Crankshaft connector 12 installs on the diesel engine bent axle, becomes the thick bent axle of diesel engine free end into slender axles, is convenient for drawing forth of signal and is connected with shaft coupling 13, and specifically, crankshaft connector 12 one end is located inside organism connecting piece 11 and is connected with the diesel engine bent axle, and crankshaft connector 12 other end stretches into inside the coupling 13 and is connected with main shaft 22 through shaft coupling 13 of passing through of sleeve 21. The coupling 13 ensures synchronous rotation of the main shaft 22 and the crankshaft, and is electrically conductive so that both are equipotential bodies. The carbon brush 23 is arranged on the main shaft 22, and the carbon brush 23 is connected into a contact potential leading-out closed loop 30 to lead out the potentials of the crankshaft and the main shaft 22. The encoder 24 is attached to the main shaft 22, and is connected to a crank angle signal processing circuit as an angle index signal output device.

Preferably, the monitoring device further comprises an auxiliary mounting tool centralizer 40, and the crankshaft connector 12 is connected with the crankshaft 32 inside the machine body connecting piece 11 through the centralizer 40. As shown in fig. 2, the centering device 40 is an annular structure, the inner hole of the centering device is matched with the crankshaft connector 12 by the tolerance grade of IT6, the outer diameter of the centering device is matched with the machine body connecting piece 11 by the tolerance grade of IT6, and the errors of the crankshaft 32, the crankshaft connector 12 and the machine body connecting piece 11 are guaranteed, so that the centering degree of the main shaft 22 and the crankshaft 32 is improved, the vibration caused by the angle coaxiality error is eliminated, and the reliability of the monitoring system is improved. A spigot is provided between the crankshaft connector 12 and the crankshaft 32 to reduce concentricity errors. In addition, each part coaxially connected with the device adopts a spigot design, the coaxiality of each part is further ensured, and accumulated eccentricity is avoided.

Further optimize, sleeve 21 is the syllogic structure, including coaxial signal extraction device connecting piece 211, base 212, the sensor cover body 213 that sets gradually, and shaft coupling 13 is located inside signal extraction device connecting piece 211, and carbon brush 23 is located inside base 212, and encoder 24 is located inside sensor cover body 213. The signal leading-out device connecting piece 211 is coaxially and fixedly arranged on the machine body connecting piece 11. The base 212 is fixedly connected with the signal leading-out device connecting piece 211 through bolts and is provided with a spigot, so that a good centering effect is guaranteed. The sensor cover body 213 is connected with the base 212 through the middle support plate 25, the upper end and the lower end of the middle support plate 25 are respectively connected with the sensor cover body 213 and the inner thread of the base 212 through outer threads, the outer diameter of the lower end of the middle support plate 25 is smaller than that of the upper end, and the middle support plate 25 and the base 212 are reinforced through screws. The middle supporting plate 25 is adopted to connect the base 212 and the sensor cover body 213, so that the structure is simple, safe and good in centering property. The sleeve 21 has good sealing properties throughout, ensuring that its internal components are not corroded by oil mist.

Further preferably, the front end of the main shaft 22 is connected with the base 212 through a front end support bearing 26, and the rear end of the main shaft 22 is connected with the middle support plate 25 through a rear end support bearing 26; nylon sleeves 27 are arranged between the front end supporting bearing 26 and the base 212 and between the rear end supporting bearing 26 and the middle supporting plate 25, so that insulation between the main shaft 22 and the diesel engine body is ensured.

Further preferably, a rotor of the carbon brush 23 is installed on the main shaft 22, and a stator of the carbon brush 23 is fixed on the base 212 through an insulating screw; the heat insulation plate 28 is arranged between the carbon brush 23 and the base 212, so that heat of the machine body is prevented from being conducted to the carbon brush 23, and damage to electronic components due to high temperature is prevented.

Preferably, an opening is provided in the wall of the base 212 for adjusting the coupling 13.

Further preferably, as shown in fig. 3, the contact potential leading closed loop 30 includes a dc power supply E, a first resistor R1, and a second resistor R2 connected in series, wherein a voltmeter V is connected across the first resistor R1, and the carbon brush 23 is connected in parallel with the first resistor R1. The precision of the second resistor R2 is more than 10 times of that of the first resistor R1, and the sensitivity requirement of the touch signal is guaranteed.

The utility model discloses the monitoring principle of device as follows: the crankshaft 32 rotates with a load in the diesel engine frame, and the sliding bearings are used for gravity support and horizontal and vertical position correction of the crankshaft 32. The fit clearance between the two is generally below 0.1mm, and oil is supplied by oil pressure. When the crankshaft rotates, entrained oil forms an oil wedge around it, which can withstand considerable alternating loads. The sliding bearing bush installed in the frame is generally composed of wear-resistant babbitt metal and reinforced steel backing, and the alloy layer is separated from the crankshaft 32 by a lubricating oil 33 oil film, so that the crankshaft 32 and the bush 31 are in an insulated state. The bearing bush and the frame are tightly attached to form an equipotential body which is well connected and grounded. If the crankshaft and the bearing bush are in micro-peak contact, a large amount of friction heat is generated, so that the oil film of the lubricating oil 33 is locally damaged, and the lubricating state between the crankshaft 32 and the bearing bush 31 is deteriorated. Therefore, at the stage of diesel engine design, the development of the micro-bump contact between the crankshaft 32 and the bearing bush 31, i.e. the two are in an insulated state, is avoided. When the circuit is organized by the first resistor R1, the second resistor R2 and the DC power supply E, current exists in the loop, and in a normal state, a voltmeter at the two ends of the first resistor R1 has a reading and is a fixed value. However, when the diesel engine works for a long time, fatigue wear occurs on a part of the bearing bushes, and micro-hump contact occurs between the crankshaft 32 and the bearing bushes 31, that is, the first resistor R1 is short-circuited, and a voltmeter at two ends of the first resistor R1 has no reading (voltage is 0), so that the sliding bearing of the diesel engine works in a bad state at this time.

Among the types of marine diesel engines, there are six-cylinder machines, eight-cylinder machines, V-type 16-cylinder machines, etc., which usually include multi-stage sliding bearings, and it is not known exactly which stage of sliding bearings are worn out simply by means of a contact potential signal at a certain moment. However, the cylinders of the diesel engine have a working sequence, the first cylinder works as a starting point, and other cylinders work in turn according to a certain crank angle rule. Thus, if the work done by the ignition of the first cylinder is taken as the zero moment, the work done by any other cylinder can be determined through the accumulated amount of the crank angle. The most significant characteristic of the sliding bearing is that the crankshaft makes contact with the bearing shell most easily because of the greatest impact on the sliding bearing at the moment of application. Because the crank angle and the contact potential signal can be referenced by time, the cylinder position corresponding to the abnormal contact potential signal and a sliding bearing with possible abrasion failure can be found by taking the time as a bridge. The utility model discloses a set up encoder 24 on signal extraction device 20, as angle mark signal output device, access crankshaft angle signal processing circuit, crankshaft angle signal processing circuit handles the crankshaft angle signal that encoder 24 conveys, turns into digital signal with crankshaft angle signal.

The marine diesel shafting sliding bearing comprises a main bearing and a connecting rod big-end bearing, aiming at the working process of the shafting sliding bearing, the main bearing is influenced by 2 adjacent cylinders, so that 2 valleys (see 4-3 in figure 4) exist when the main bearing fails, and the connecting rod big-end bearing is only influenced by the corresponding cylinder, so that only one valley (see 4-2 in figure 4) exists when the main bearing contacts. Therefore, the device can distinguish the fault of the main bearing from the fault of the big end bearing of the connecting rod.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (10)

1. A sliding bearing wear monitoring device of a marine diesel engine based on a contact potential method comprises a mechanical supporting device (10), a signal leading-out device (20) and a signal analysis processing unit, and is characterized in that,

the mechanical support device (10) comprises a machine body connecting piece (11), a crankshaft connector (12) and a coupling (13); the signal leading-out device (20) comprises a sleeve (21), and a main shaft (22), a carbon brush (23) and an encoder (24) which are arranged in the sleeve (21); the signal analysis processing unit comprises a contact potential leading-out closed loop (30) and a crank angle signal processing circuit;

the engine body connecting piece (11) is arranged on the diesel engine body, and the sleeve (21) is coaxially and fixedly connected with the engine body connecting piece (11); one end of the crankshaft connector (12) is positioned in the engine body connecting piece (11) and is connected with a crankshaft of the diesel engine, and the other end of the crankshaft connector (12) extends into the sleeve (21) and is connected with the main shaft (22) through a coupler (13); the carbon brush (23) is installed on the main shaft (22), the carbon brush (23) is connected to the contact potential to lead out a closed loop (30), and the potentials of the crankshaft and the main shaft (22) are led out; the encoder (24) is arranged on the main shaft (22) and is used as an angle mark signal output device and connected to the crank angle signal processing circuit.

2. The device for monitoring the wear of sliding bearings of marine diesel engines based on the contact potential method according to claim 1, characterized in that the device further comprises an auxiliary mounting tool centralizer (40), and the crankshaft connector (12) is connected with the crankshaft (32) inside the engine body connecting piece (11) through the centralizer (40).

3. The marine diesel sliding bearing wear monitoring device based on the contact potential method as claimed in claim 2, characterized in that the centralizer (40) is a ring-shaped structure, the inner hole of which is matched with the crankshaft connector (12) with the tolerance grade of IT6, and the outer diameter of which is matched with the engine body connecting piece (11) with the tolerance grade of IT 6; a spigot is arranged between the crankshaft connector (12) and the crankshaft (32) to reduce coaxiality errors.

4. The marine diesel engine sliding bearing wear monitoring device based on the contact potential method is characterized in that the sleeve (21) is of a three-section structure and comprises a signal leading-out device connecting piece (211), a base (212) and a sensor cover body (213) which are coaxially arranged in sequence; the signal leading-out device connecting piece (211) is coaxially and fixedly connected with the machine body connecting piece (11); the base (212) is fixedly connected with the signal leading-out device connecting piece (211) and is provided with a spigot; the sensor cover body (213) is connected with the base (212) through the middle supporting plate (25); the coupler (13) is located inside the signal leading-out device connecting piece (211), the carbon brush (23) is located inside the base (212), and the encoder (24) is located inside the sensor cover body (213).

5. The marine diesel sliding bearing wear monitoring device based on the contact potential method is characterized in that the upper end and the lower end of the middle supporting plate (25) are respectively connected with the sensor cover body (213) and the internal thread of the base (212) through external threads, the outer diameter of the lower end of the middle supporting plate (25) is smaller than that of the upper end, and the middle supporting plate (25) and the base (212) are reinforced through screws.

6. The device for monitoring the wear of the sliding bearing of the marine diesel engine based on the contact potential method is characterized in that the front end of the main shaft (22) is connected with the base (212) through a front end supporting bearing (26), and the rear end of the main shaft (22) is connected with the middle supporting plate (25) through a rear end supporting bearing (26); nylon sleeves (27) are arranged between the front end supporting bearing (26) and the base (212) and between the rear end supporting bearing (26) and the middle supporting plate (25) to ensure insulation between the main shaft (22) and the diesel engine body.

7. The marine diesel engine sliding bearing wear monitoring device based on the contact potential method is characterized in that a rotor of the carbon brush (23) is installed on the main shaft (22), and a stator of the carbon brush (23) is fixed on the base (212) through an insulating screw; a heat insulation plate (28) is arranged between the carbon brush (23) and the base (212) to ensure that the heat of the machine body is not conducted to the carbon brush (23) so as to prevent the high temperature from damaging the electronic components.

8. The marine diesel sliding bearing wear monitoring device based on the contact potential method is characterized in that the contact potential leading-out closed loop (30) comprises a direct current power supply (E), a first resistor (R1) and a second resistor (R2) which are connected in series, a voltmeter (V) is connected to two ends of the first resistor (R1), and the carbon brush (23) is connected with the first resistor (R1) in parallel.

9. The device for monitoring the wear of the sliding bearing of the marine diesel engine based on the contact potential method is characterized in that the precision of the second resistor (R2) is more than 10 times of that of the first resistor (R1), so that the sensitivity requirement of a contact signal is ensured.

10. The marine diesel sliding bearing wear monitoring device based on the contact potential method according to claim 1, characterized in that the diameter of the end of the crankshaft connector (12) connected with the coupling (13) is smaller than the diameter of the end connected with the crankshaft.

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