WO2018110390A1

WO2018110390A1 - Wear measurement system, combustion chamber component and wear measurement method

Info

Publication number: WO2018110390A1
Application number: PCT/JP2017/043849
Authority: WO
Inventors: 芳彦木下; 浩二江戸
Original assignee: 三菱重工業株式会社; 株式会社ジャパンエンジンコーポレーション
Priority date: 2016-12-13
Filing date: 2017-12-06
Publication date: 2018-06-21
Also published as: CN110023710A; JP2018096837A; KR20190070964A

Abstract

A wear measurement system, a wear measurement method and a combustion chamber component are provided which make it easy to measure the amount of wear of a target. This wear measurement system, for measuring wear of a target in a combustion chamber of a diesel engine, is provided with an imaging device which images a measurement hole and a reference hole formed in the target, and a calculation unit which analyzes the image captured by the imaging device, calculates the size of the measurement hole on the basis of the reference hole contained in the image, and calculates the amount of wear of the target on the basis of the size of the measurement hole.

Description

Wear measurement system, combustion chamber parts and wear measurement method

The present invention relates to a wear measurement system, a combustion chamber component, and a wear measurement method for measuring the amount of wear of a combustion chamber of a diesel engine.

For example, an internal combustion engine as a main engine mounted on a ship includes a piston and a cylinder liner that accommodates the piston, which moves up and down by burning fuel, and an exhaust valve that discharges air from a combustion chamber surrounded by the piston and the cylinder liner. Have. The cylinder liners wear when the pistons slide. As the amount of wear on the cylinder liners increases, replacement is required. Patent Document 1 describes, as a method of measuring the amount of wear of a piston ring, a method of forming a groove and measuring the amount of wear based on the state of the groove.

Japanese Patent Application Laid-Open No. 61-31768

Here, for example, the wear amount of the cylinder liner is measured by a worker entering the inside of the cylinder liner and measuring the diameter of the inside of the cylinder liner. However, in order for a worker to enter the cylinder liner, it is necessary to remove a member or the like at the top of the cylinder liner of the internal combustion engine, which takes time and requires a large burden on the operation. Similarly, the exhaust valve, which is a portion exposed to the combustion chamber, is also disposed in the combustion chamber, so measurement of the amount of wear takes time, and the work load is large. Further, although the piston can visually recognize the state of the surface from the scavenging port for supplying air to the combustion chamber, a dedicated jig is required to measure the amount of wear, and the work load is large.

The present invention solves the problems described above, and provides a wear measurement system, combustion chamber parts, and a wear measurement method capable of easily measuring the wear amount of a measurement object in a combustion chamber of a diesel engine. To aim.

The present invention for achieving the above object is a wear measurement system for measuring wear of an object in a combustion chamber of a diesel engine, and an imaging device for imaging a reference hole and a measurement hole formed in the object A calculating device that analyzes an image captured by the imaging device, calculates a size of a measurement hole based on a reference hole included in the image, and calculates a wear amount of the object based on a size of the measurement hole And.

The reference hole and the measurement hole formed in the object are acquired as an image, and the diameter of the measurement hole is calculated using the reference hole. Thus, by installing the imaging device on the object, it is possible to measure the amount of wear of the object in the combustion chamber. As a result, the amount of wear can be measured without removing the upper part of the cylinder liner of the internal combustion engine. Further, by calculating the diameter of the measurement hole using the reference hole, the photographing position of the photographing device can be set to an arbitrary position, and the measurement becomes easy.

A combustion chamber component at least a part of which is exposed in a combustion chamber of a diesel engine, and has a reference hole and a measurement hole formed on the inner peripheral surface of the combustion chamber, and the reference hole has a constant diameter It is characterized by being.

Here, the measurement hole is preferably a tapered hole.

Preferably, the measurement holes are a plurality of holes having different depths.

Preferably, the measurement holes are a plurality of holes having different depths and diameters.

Preferably, the object is a cylinder liner. The cylinder liner preferably has a reference hole and a measurement hole formed on the inner circumferential surface, and the reference hole preferably has a constant diameter.

Further, it is preferable that the photographing device be mounted on the upper surface of the piston and photograph a reference hole and a measurement hole formed on the inner circumferential surface of the cylinder liner. Thereby, the wear amount of the cylinder liner can be measured.

Preferably, the measurement hole is formed at the same height position as the reference hole along the moving direction of the piston. The imaging device that moves with the piston can capture the measurement hole and the reference hole more reliably.

Further, it is preferable that the measurement hole is formed in a region sandwiched by the piston ring of the piston at the top dead center. This makes it possible to measure wear at a position where wear is likely to occur.

Preferably, the measurement hole is formed at a position where the difference between the temperature of the sliding surface of the cylinder liner and the dew point temperature of water is the smallest. This makes it possible to measure wear at a position where wear is likely to occur.

Preferably, a plurality of the measurement holes are formed in the circumferential direction of the cylinder liner. Thereby, the wear amount at each position in the circumferential direction can be measured.

The object is preferably a piston. Thereby, the wear amount of the piston can be measured. When the object is a piston, the measurement hole is preferably provided at a position farthest from the cooling medium passage inside the piston in the circumferential direction of the piston. This makes it possible to detect the amount of wear at the position where the temperature rises during operation. Further, the measurement hole is provided at a contact surface position (a position at which a flame approaches) rotated by an angle of 90 ° or more and 180 ° or less in the fuel injection direction from the combustion valve position for injecting fuel in the circumferential direction of the piston. Is also preferred. Thereby, the maximum wear amount of the piston can be measured.

The object is preferably an exhaust valve. Thereby, the wear amount of the exhaust valve can be measured. In the case where the object is an exhaust valve, the measurement hole is moved from the center of the exhaust valve in the radial direction by a distance of 1/4 or more and 1/2 or less of the radius of the umbrella portion of the exhaust valve. It is preferable to provide the Preferably, the measurement hole is provided at a contact surface position rotated by 90 ° to 180 ° in the injection direction from the position of the combustion valve in the circumferential direction of the combustion chamber. Thereby, the maximum wear amount of the exhaust valve can be measured.

Preferably, the measurement hole is a tapered hole. Since the diameter changes linearly according to the amount of wear, the amount of wear can be measured with higher resolution.

Preferably, the measurement holes are a plurality of holes having different depths. The amount of wear can be determined based on the number of holes remaining.

Preferably, the measurement holes are a plurality of holes having different depths and diameters. Since the states of a plurality of holes can be compared, the amount of wear can be easily determined visually.

The present invention for achieving the above object is a wear measurement method for measuring the wear of an object in a combustion chamber of a diesel engine, wherein a reference hole and a measurement hole formed in the object with a photographing device are photographed A photographing step, a calculation step of analyzing the photographed image, calculating the size of the measurement hole based on the reference hole included in the image, and calculating the wear amount of the object based on the size of the measurement hole , And.

For example, in the case of wear measurement of the cylinder liner, the step of disposing the imaging device on the upper surface of the piston, moving the piston, and imaging the reference hole and the measurement hole formed on the inner circumferential surface of the cylinder liner by the imaging device Calculation step of analyzing the photographed image, calculating the size of the measurement hole based on the reference hole included in the image, and calculating the wear amount of the cylinder liner based on the size of the measurement hole And.

ADVANTAGE OF THE INVENTION According to this invention, the abrasion loss of the target object of a combustion apparatus can be measured easily.

FIG. 1 is a schematic configuration view showing a diesel engine of the present embodiment. FIG. 2 is a schematic view showing a schematic configuration of a combustion chamber and a wear measurement system. FIG. 3 is a cross-sectional view of a cylinder liner. FIG. 4 is a front view of the hole unit. FIG. 5 is a cross-sectional view of the hole unit. FIG. 6 is a flowchart showing an example of the process of the wear measurement method. FIG. 7 is a cross-sectional view showing another example of the hole unit. FIG. 8 is a cross-sectional view showing another example of the hole unit. FIG. 9 is a front view for explaining an example of the arrangement position of the hole unit. FIG. 10 is a front view showing another example of the hole unit. FIG. 11 is a perspective view showing a hole unit of a piston. FIG. 12 is a perspective view showing a hole unit of the exhaust valve. FIG. 13 is a flowchart showing an example of the process of the wear measurement method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited by the embodiments, and in the case where there are a plurality of embodiments, the present invention also includes those configured by combining the respective embodiments.

An example of an internal combustion engine having a cylinder liner of the present invention will be described. FIG. 1 is a schematic view showing a diesel engine. The diesel engine 10 shown in FIG. 1 is, for example, a main engine for ship propulsion, and is a two-stroke one-cycle uniflow scavenging crosshead internal combustion engine. The diesel engine 10 has a base plate 11 positioned below, a frame 12 provided on the base plate 11, and a cylinder jacket 13 provided on the frame 12. The base plate 11, the structure 12, and the cylinder jacket 13 are integrally fastened and fixed by a plurality of tension bolts (tie bolts / connection members) 14 and tension bolt nuts 15 extending in the vertical direction.

A cylinder liner 16 is inserted into the cylinder jacket 13, and a cylinder cover 17 is provided at the upper end of the cylinder liner 16. The cylinder liner 16 and the cylinder cover 17 define a space 18, and the piston 19 is provided in the space 18 so as to be capable of reciprocating up and down, whereby a combustion chamber 20 is formed. The cylinder cover 17 is provided with an exhaust valve 21. The exhaust valve 21 opens and closes the combustion chamber 20 and the exhaust gas pipe 22. The exhaust valve 21 only needs to have the function of opening and closing the combustion chamber 20 and the exhaust gas pipe 22, and is not necessarily provided at the center of the cylinder cover 17.

Therefore, a fuel (for example, low-quality oil, natural gas, or a mixed fuel thereof) supplied from a fuel injection pump (not shown) to combustion chamber 20 and a combustion gas (for example, air) compressed by a compressor (not shown) , EGR gas, or a mixture thereof) is combusted. Then, the piston 19 moves up and down by the energy generated by this combustion. At this time, when the combustion chamber 20 is opened by the exhaust valve 21, the exhaust gas generated by the combustion is pushed out to the exhaust gas pipe 22, while the combustion gas is introduced into the combustion chamber 20 from a scavenging port not shown.

The upper end portion of the piston rod 23 is rotatably connected to the lower end portion of the piston 19. The base plate 11 is a crankcase, and a bearing 25 rotatably supporting the crankshaft 24 is provided. Further, the lower end portion of the connecting rod 27 is rotatably connected via the crank 26 to the crankshaft 24. In the frame 12, a pair of guide plates 28 extending in the vertical direction is fixed at a predetermined interval, and the crosshead 29 is supported so as to be vertically movable between the pair of guide plates 28. In the cross head 29, the lower end portion of the piston rod 23 and the upper end portion of the connecting rod 27 are rotatably connected.

Therefore, the piston 19 to which energy has been transferred by combustion is pushed down with the piston rod 23 in the direction of the installation surface of the diesel engine 10 (in the direction of the base plate 11, that is, downward in the vertical direction). Then, the piston rod 23 pushes the crosshead 29 in the same direction, and rotates the crankshaft 24 via the connecting rod 27 and the crank 26.

Next, a combustion chamber including a cylinder liner and a wear measurement system will be described using FIGS. 2 to 6. In this embodiment, the case where the amount of wear of the cylinder liner 16 which is a part of the combustion chamber 20 is measured will be described. FIG. 2 is a schematic view showing a schematic configuration of a combustion chamber and a wear measurement system. FIG. 3 is a cross-sectional view of a cylinder liner. FIG. 4 is a front view of the hole unit. FIG. 5 is a cross-sectional view of the hole unit. FIG. 6 is a flowchart showing an example of the process of the wear measurement method.

The cylinder liner 16 is an area in which the piston 19 reciprocates, and has a cylindrical shape. The scavenging port 90 is connected to the cylinder liner 16. The scavenging port 90 is connected to the scavenging trunk 92. The cylinder liner 16 is supplied with air from the scavenging port 90 to the space between the cylinder cover 17 and the piston 19 when the piston 19 becomes lower than the scavenging port 90 (position away from the cylinder cover 17) during operation. Ru.

The cylinder liner 16 has a cooling medium channel 110 formed at least one of the inside and the outside. The cooling medium channel 110 is provided on the entire circumference of the cylinder liner 16 in the circumferential direction. The cooling medium flow path 110 is connected to the cooling medium supply line 112 and the cooling medium discharge line 114. The cooling medium supply line 112 supplies the cooling medium to the cooling medium channel 110. The coolant discharge line 114 discharges the coolant that has flowed through the coolant channel 110. Heating of the cylinder liner 16 is suppressed by supplying the cooling medium to the cooling medium channel 110. Examples of the cooling medium include liquid media such as oil and water. In the cylinder liner 16, a hole unit 106 is formed on the inner circumferential surface of a stroke range St in which the piston 19 reciprocates. A plurality of hole units 106 of this embodiment are formed. The hole unit 106 is used to measure the amount of wear of the cylinder liner 16. The hole unit 106 will be described later.

The wear measurement system 100 includes a calculation device 102 and an imaging device 104. The calculation device 102 is communicably connected to the imaging device 104 in a wired wireless manner, processes an image captured by the imaging device 104, and measures the amount of wear of the cylinder liner 16. The wear measurement system 100 may capture an image (moving image, still image) with the imaging device 104, and output the captured image to the calculation device 102 via communication or a recording medium.

The imaging device 104 is a device that can be transported by a worker and captures an image. The imaging device 104 may capture a still image or may capture a moving image. The imaging device 104 may move the imaging region in the circumferential direction and the axial direction of the cylinder liner 16, or may capture 360 degrees of the inner periphery of the cylinder liner 16 in a fixed state. In addition, the imaging device 104 may include an imaging unit configured to capture an image, and an illumination unit configured to illuminate the imaging region.

The hole unit 106 is photographed by the photographing device 104 when the amount of wear of the cylinder liner 16 is measured. The hole units 106 are formed at a plurality of locations in the circumferential direction of the cylinder liner 16 and at a plurality of locations in the axial direction of the cylinder liner 16 (the direction in which the piston 19 moves). The hole unit 106 is preferably formed at a position overlapping the scavenging port 90 in the circumferential direction of the cylinder liner 16. The hole unit 106 is formed in the range included in the stroke area St in the axial direction of the cylinder liner 16. The hole unit 106 has a reference hole 122 and a measurement hole 124 as shown in FIGS. 4 and 5. The reference holes 122 and the measurement holes 124 are formed on the surface of the cylinder liner 16. The reference hole 122 is a hole whose diameter is constant in the range of depth at which wear is measured. The measurement hole 124 is a tapered hole whose diameter changes in the depth direction. Further, the reference hole 122 and the measurement hole 124 have a length in the axial direction of the cylinder liner 16 shorter than the width of the piston ring (the distance in the axial direction of the cylinder liner 16) which is a seal member disposed in the piston 19 . Here, when there are a plurality of piston rings, the length is shorter than the shortest piston ring.

Next, a wear measurement method using the wear measurement system will be described with reference to FIG. First, the piston 19 is moved below the scavenging port 90, that is, the piston 19 is moved to the bottom dead center side, and the scavenging port 90 is connected to the region surrounded by the cylinder liner 16 and the piston 19 (step S12). ).

Next, the photographing device 104 is installed on the upper surface of the piston 19 (step S14). Specifically, a worker carries the imaging device 104 and accesses it from the scavenging air manifold 30 or the inspection window 31 on the fuel pump side, inserts the imaging device 104 into the cylinder liner 16 from the scavenging air port 90, and Install. Since the upper surface of the piston 19 can be confirmed from the scavenging port 90, the operator can install the imaging device 104 on the upper surface of the piston 19 without entering the cylinder liner 16. Next, after the imaging device 104 is installed, the piston 19 is moved to image the cylinder liner 16 (step S16). By imaging the cylinder liner 16, an image of the hole unit 106 included in the imaging area is acquired.

When an image is acquired by the imaging device 104, the hole unit 106 is detected from the acquired image (step S18). When the image of the hole unit 106 is detected, the diameter of the measurement hole 124 is calculated based on the reference hole 122 (step S20). Specifically, the relative relationship between the size on the image and the actual diameter is specified based on the reference hole having a constant diameter, and the diameter of the measurement hole is based on the specified relative relationship and the size of the measurement hole of the image. Calculate After calculating the diameter of the measurement hole, the amount of wear is calculated based on the diameter of the measurement hole (step S22). Specifically, the amount of wear is measured based on the relationship between the diameter and the depth of the tapered measurement hole and the current diameter of the measurement hole 124.

As described above, the wear measurement system 100 acquires the reference hole 122 and the measurement hole 124 formed in the cylinder liner 16 as an image, calculates the diameter of the measurement hole 124 using the reference hole 122, and measures the measurement hole 124. Measure the amount of wear based on the diameter of Thus, by installing the imaging device 104 inside the cylinder liner 16, the amount of wear of the cylinder liner 16 can be measured. Moreover, since the imaging device 104 can be installed from the scavenging port 90, the amount of wear can be measured without an operator entering the inside of the cylinder liner. That is, measurement can be performed without removing the upper cover of the cylinder liner. Further, by calculating the diameter of the measurement hole 124 using the reference hole 122, the photographing position of the photographing device can be set to an arbitrary position, and the measurement becomes easy. That is, even if the imaging position and the position of the hole unit 106 change, the diameter of the measurement hole 124 can be calculated by the reference hole 122. For this reason, since the operator only needs to install the imaging device 104 at a position where the hole unit 106 can capture an image, the installation can be easily performed, and the wear amount can be measured with high accuracy. Further, by setting the measurement target as the hole unit 106, that is, by providing the measurement target in a part of the cylinder liner 16 in the circumferential direction, the influence of the hole unit 106 on the movement of the piston 19 can be reduced. Even if the hole unit 106 is provided by making the axial length of the reference hole 122 and the measurement hole 124 in the axial direction of the cylinder liner 16 shorter than the width of the piston ring, sealing performance between the cylinder liner 16 and the piston 19 is provided. Can be maintained.

Also, the cylinder liner 16 can calculate the diameter of the measurement hole using the reference hole, and can be a cylinder liner that can easily measure the amount of wear. By making the measurement hole 124 a tapered hole, the diameter changes linearly in accordance with the amount of wear, so the amount of wear can be measured with higher resolution.

Preferably, the cylinder liner 16 is provided at a position where the hole unit 106 overlaps the scavenging port 90 in the circumferential direction. Thus, the hole unit 106 can be formed near the position where the imaging device is installed, the hole unit 106 can be photographed more reliably, and the wear amount can be easily measured.

FIG. 7 is a cross-sectional view showing another example of the hole unit. The hole unit 106 a has

measurement holes

132, 134, 136 and a reference hole 138. The measurement holes 132, 134, 136 are holes having different depths. The measurement holes 132, 134, 136 are holes having a constant diameter. The hole unit 106a can change the remaining holes according to the amount of wear by having the measurement holes 132, 134, 136 having different depths. By providing the plurality of holes in this manner, the state of the plurality of holes can be compared, so the amount of wear can be easily determined visually. Also, one of the plurality of holes, basically, the deepest hole is used as a reference hole, and the measurement remaining accurately by comparing the positional relationship (distance) between the reference hole and the other measurement holes Holes can be identified. By identifying the remaining measurement holes, the amount of wear of the cylinder liner can be measured.

FIG. 8 is a cross-sectional view showing another example of the hole unit. In the hole unit 106b, a plurality of measurement holes and reference holes are overlapped, and a step hole 140 in which a step is formed is formed. The step holes 140 have

steps

141, 142, 144, and 146. As described above, the same effect as described above can be obtained by arranging the holes one on top of the other.

Further, it is preferable that the hole unit 106 be disposed in an area between the piston ring of the piston 19 and the piston 19 moved to the top dead center. That is, it is preferable to arrange the hole unit 106 at a position overlapping the region where the piston ring of the piston 19 at the top dead center is disposed in the axial direction of the cylinder liner 16.

FIG. 9 is a front view for explaining an example of the arrangement position of the hole unit. In the hole unit 106 shown in FIG. 9, when the measurement hole 124 and the reference hole 122 are viewed from the axial center of the cylinder liner 16, the cooling medium supply line 114 for supplying the cooling medium to the cylinder liner and the cooling medium flow passage 110. It is formed in the area | region which overlaps with the cooling-medium supply line 112 which is a connection position. This makes it possible to measure wear at a position where wear is likely to occur. Specifically, the amount of wear of the area where the cooling medium is supplied and the temperature is low can be measured. In the present embodiment, the measurement hole 124 and the reference hole 122 are disposed in the area overlapping the cooling medium supply line 112, but the measurement hole is at the position where the difference between the temperature of the liner sliding surface and the dew point temperature of water is the smallest. It is preferable to arrange.

FIG. 10 is a front view showing another example of the hole unit. The hole unit 106 c shown in FIG. 10 has one measurement hole 124 and two reference holes 122. The hole unit 106 c is aligned in the same straight line in the order of the reference hole 122, the measurement hole 124, and the reference hole 122 with respect to the moving direction 170 of the piston 19. By forming the reference hole 122 at a position overlapping the measurement hole 124 in the direction parallel to the movement direction 170 of the piston, it is possible to capture more reliably the measurement hole and the reference hole with the imaging device that moves with the piston .

Here, although the wear measurement system of the above-mentioned embodiment formed a hole unit in a cylinder liner in order to measure the amount of wear of a cylinder liner, it is not limited to this. The wear measurement system can measure the amount of wear of each part exposed at least in part to the combustion chamber 20. Specifically, in the wear measurement system, holes are formed in a region which is an inner surface of the combustion chamber 20 of the combustion chamber component which is at least a part of which is exposed to the combustion chamber 20, that is, a region constituting a part of the combustion chamber. By forming a unit and measuring the formed hole unit, it is possible to measure the amount of wear of the parts forming the hole unit.

FIG. 11 is a perspective view showing a hole unit of a piston. The piston 19 shown in FIG. 11 is provided with a piston ring 202 at its periphery. The piston ring 202 contacts the cylinder liner 16. The piston 19 is provided with a hole unit 106 d on the surface opposite to the surface connected to the piston rod 23, that is, the surface exposed to the combustion chamber 20. The hole unit 106 d has a reference hole 122 and a measurement hole 124. The reference holes 122 are disposed at different positions in the radial direction of the measurement hole 124 and the piston 19. That is, in the piston 19, the reference hole 122 and the measurement hole 124 are formed at different positions from the center 212 of the piston 19.

The wear measurement system 100 can accurately measure the diameter of the measurement hole 124 by providing the reference hole 122 and the measurement hole 124 also by providing the hole unit 106 d on the surface of the piston 19, and wear of the piston 19. The quantity can be measured.

Further, by providing the hole units 106 d at different positions in the radial direction of the piston 19, the respective holes can be easily identified.

The hole unit 106d may arrange the reference holes 122 and the measurement holes 124 in the circumferential direction, that is, the hole unit 106d may arrange the reference holes 122 and the measurement holes 124 at the same height position. Thus, the reference hole 122 and the measurement hole 124 can be compared at the same height, and the wear amount can be measured with high accuracy.

The hole unit 106 including the measurement hole 124 is preferably provided at a position farthest from the cooling medium passage 110 inside the piston 19 in the circumferential direction of the piston 19. This makes it possible to detect the amount of wear at the position where the temperature rises during operation. Further, in the circumferential direction of the piston 19, the hole unit 106d including the measurement hole 124 is a contact surface position rotated by an angle of 90 ° or more and 180 ° or less in the fuel injection direction from the combustion valve position which is a position for injecting It is also preferable to provide it at a position where the flame approaches or in contact with the flame. Thereby, the maximum wear amount of the piston can be measured.

FIG. 12 is a perspective view showing a hole unit of the exhaust valve. In the exhaust valve 21 shown in FIG. 12, a hole unit 106e is provided on the tip end surface, that is, the surface exposed to the combustion chamber 20. The hole unit 106 e has a reference hole 122 and a measurement hole 124. The reference holes 122 are disposed at different positions in the radial direction of the measurement holes 124 and the exhaust valve 21. That is, in the exhaust valve 21, the reference hole 122 and the measurement hole 124 are formed at different positions from the center 302 of the exhaust valve 21.

The wear measurement system 100 can accurately measure the diameter of the measurement hole 124 by providing the reference hole 122 and the measurement hole 124 by providing the hole unit 106 e on the surface of the exhaust valve 21. Can measure the amount of wear.

Further, by providing the hole units 106e at different positions in the radial direction of the exhaust valve 21, the exhaust valve 21 can make it easier to identify the respective holes even if the exhaust valve 21 rotates. The hole unit 106e may be arranged in the circumferential direction.

In addition, when the radius (diameter of the tip end face) of the umbrella portion of the exhaust valve 21 is Rb, the exhaust valve 21 is provided with the hole unit 106e in a region of a distance 1/4 Rb to 1/2 Rb from the center 212 of the piston. Is preferred. That is, it is preferable to provide the measurement hole in the contact surface position moved in the radial direction from the center of the exhaust valve 21 by a distance of 1/4 or more and 1/2 or less of the radius of the umbrella portion of the exhaust valve 21. The hole unit 106e is also preferably provided at the contact surface position rotated 90 ° to 180 ° in the injection direction from the position of the combustion valve in the circumferential direction of the combustion chamber. This makes it possible to measure the wear at the most worn position.

Next, a wear measurement method using the wear measurement system for measuring the wear amount of the piston 19 or the exhaust valve 21 will be described with reference to FIG. FIG. 13 is a flowchart showing an example of the process of the wear measurement method. First, the photographing device 104 is installed (step S32). Specifically, the worker carries the imaging device 104 and installs the imaging device 104 at a position where the

hole units

106d and 106e of the object (the piston 19 or the exhaust valve 21) can image. When the object is the piston 19, the piston 19 is moved below the scavenging port 90, the photographing device 104 is inserted from the scavenging port 90, and the upper surface of the piston 19 is photographed. When the object is the exhaust valve 21, the photographing device 104 is installed on the upper surface of the piston 19, and the piston 19 is moved to a position where the photographing device 104 can photograph the exhaust valve 21, such as top dead center or near top dead center. .

Next, when the photographing device 104 is installed, the object is photographed (step S34). By photographing the object, the images of the

hole units

106d and 106e included in the photographing area are acquired.

When an image is acquired by the imaging device 104, the

hole units

106d and 106e are detected from the acquired image (step S36). When the images of the

hole units

106d and 106e are detected, the diameter of the measurement hole is calculated based on the reference hole (step S38). Specifically, the relative relationship between the size on the image and the actual diameter is specified based on the reference hole having a constant diameter, and the diameter of the measurement hole is based on the specified relative relationship and the size of the measurement hole of the image. Calculate After calculating the diameter of the measurement hole, the amount of wear is calculated based on the diameter of the measurement hole (step S40). Specifically, the amount of wear is measured based on the relationship between the diameter and the depth of the tapered measurement hole and the current diameter of the measurement hole 124.

As described above, the wear measurement system 100 acquires the reference hole 122 and the measurement hole 124 formed in the object as an image, calculates the diameter of the measurement hole 124 using the reference hole 122, and measures the diameter of the measurement hole 124. Measure the amount of wear based on the diameter. Thus, by installing the imaging device 104 inside the cylinder liner 16, the amount of wear of the object can be measured. Further, the imaging device can be installed from the scavenging port 90 for any object. In addition, since imaging can be performed from the scavenging port 90, the amount of wear can be measured without an operator entering the inside of the cylinder liner. That is, measurement can be performed without removing the upper cover of the cylinder liner 16. Further, by calculating the diameter of the measurement hole 124 using the reference hole 122, the photographing position of the photographing device can be set to an arbitrary position, and the measurement becomes easy. That is, even if the positions of the imaging position and the

hole units

106d and 106e change, the diameter of the measurement hole 124 can be calculated by the reference hole 122. For this reason, since the operator only needs to install the imaging device 104 at a position where the

hole units

106d and 106e can image, it can be easily installed and the wear amount can be measured with high accuracy. Further, by setting the measurement target to the

hole units

106d and 106e, that is, by providing the measurement target in a part of the object, the influence of the

hole units

106d and 106e on the object can be reduced.

10 diesel engine (crosshead internal combustion engine)
11 base plate 12 frame structure 13 cylinder jacket 14 tension bolt (connection member)
15 tension bolt nut 16 cylinder liner 17 cylinder cover 18 space 19 piston 20 combustion chamber 21 exhaust valve 22 exhaust pipe 23 piston rod 24 crankshaft 25 bearing 26 crank 27 connecting rod 28 guide plate 29 cross head 30 scavenging manifold 31 inspection window 100 Wear measurement system 102 Calculation device 104 Imaging device 106 Hole unit 110 Coolant channel 112 Coolant supply line 114 Coolant discharge line 122 Reference hole 124 Measurement hole

Claims

A wear measurement system for measuring the wear of an object in a combustion chamber of a diesel engine, comprising:
An imaging device for imaging a reference hole and a measurement hole formed in the object;
A calculating device that analyzes an image captured by the imaging device, calculates the size of the measurement hole based on the reference hole included in the image, and calculates the wear amount of the object based on the size of the measurement hole A wear measuring system comprising:
The object is a cylinder liner,
The wear measuring system according to claim 1, wherein the photographing device is mounted on an upper surface of a piston and photographs a reference hole and a measurement hole formed on an inner circumferential surface of the cylinder liner.
The wear measurement system according to claim 2, wherein the measurement hole is formed at the same height position as the reference hole along the movement direction of the piston.
The wear measurement system according to claim 2 or 3, wherein the measurement hole is formed in a region sandwiched by a piston ring of the piston at a top dead center.
The wear measurement system according to claim 2 or 3, wherein the measurement hole is formed at a position where the difference between the temperature of the sliding surface of the cylinder liner and the dew point temperature of water is the smallest.
The wear measurement system according to any one of claims 2 to 5, wherein a plurality of the measurement holes are formed in the circumferential direction of the cylinder liner.
The wear measurement system according to claim 1, wherein the object is a piston.
The wear measurement system according to claim 1, wherein the object is an exhaust valve.
The wear measurement system according to any one of claims 1 to 8, wherein the measurement hole is a tapered hole.
The wear measurement system according to any one of claims 1 to 8, wherein the measurement holes are a plurality of holes having different depths.
The wear measurement system according to any one of claims 1 to 8, wherein the measurement holes are a plurality of holes having different depths and diameters.
A combustion chamber part exposed at least partially to a combustion chamber of a diesel engine,
It has a reference hole and a measurement hole formed on the inner circumferential surface of the combustion chamber,
The combustion chamber component, wherein the reference hole has a constant diameter.
The combustion chamber component according to claim 12, wherein the measurement hole is a tapered hole.
The combustion chamber component according to claim 12, wherein the measurement hole is a plurality of holes having different depths.
The combustion chamber component according to claim 12, wherein the measurement hole is a plurality of holes having different depths and diameters.
The combustion chamber component is a cylinder liner, and the measurement hole is formed at the same height position as the reference hole along the movement direction of the piston. Combustion chamber parts according to one of the claims.
17. The combustion chamber component is a cylinder liner, and the measurement hole is formed in a region sandwiched by a piston ring of a piston at a top dead center, according to any one of claims 12 to 16. Combustion chamber parts described.
The combustion chamber part is a cylinder liner, and the measurement hole is formed at a position where the difference between the temperature of the sliding surface of the combustion chamber and the dew point temperature of water is the smallest. The combustion chamber component according to any one of 17.
A wear measurement method for measuring the wear of an object in a combustion chamber of a diesel engine, comprising:
An imaging step of imaging a reference hole and a measurement hole formed on the object with an imaging device;
Calculating the size of the measurement hole based on the reference hole included in the image by analyzing the photographed image, and calculating the wear amount of the object based on the size of the measurement hole. Wear measurement method characterized by
Placing an imaging device on top of the piston;
An imaging step of moving the piston and imaging the reference hole and the measurement hole formed on the inner circumferential surface of the cylinder liner with the imaging device;
Calculating the size of the measurement hole based on the reference hole included in the image by analyzing the photographed image, and calculating the wear amount of the cylinder liner based on the size of the measurement hole. Wear measurement method characterized by