JP2009276303A - Measuring method and measuring instrument for maximum abrasion quantity of cylinder liner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and accurately measure the maximum abrasion quantity of a cylinder liner in a short time without detaching a cylinder head or an exhaust valve. <P>SOLUTION: A spring 13 is installed within a cylindrical measuring instrument body 12 so as to outwardly protrude its free end 13a from a body opening 15. A pair of support guides 17a, 17b are provided on a front face of the measuring instrument body 12 along an axial center O of the measuring instrument body 12. A main scale 18 is provided between a pair of the support guides 17a, 17b. A foldable linear body 20 is attached to the free end 13a of the spring 13, and inserted into a pair of the support guides 17a, 17b through the measuring instrument body 12. A sub scale 28 is provided on the linear body 20, and color-coded in the same length as an interval of a pair of the support guides 17a, 17b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a cylinder liner maximum wear that accurately measures the maximum wear amount of the cylinder liner in a short time without removing the cylinder head or the exhaust valve in a large two-stroke cycle crosshead type diesel engine having a cylinder diameter exceeding 500 mm. The present invention relates to a quantity measuring method and a measuring instrument.

  In a two-stroke cycle crosshead type diesel engine, if the maximum wear amount of the cylinder liner exceeds a certain limit, the operation will be hindered, so the cylinder liner needs to be replaced. For this reason, the maximum wear amount of the cylinder liner is information necessary for planning and carrying out the maintenance work of the diesel engine, and this must be measured periodically.

  In order to know the amount of wear of the cylinder liner, a method of removing the cylinder head or the exhaust valve and measuring the diameter of the cylinder liner with a cylinder gauge is common (see, for example, Patent Document 1).

  Usually, the maximum wear point is in the upper part of the cylinder liner, and in order to measure the maximum wear amount of the cylinder liner, the cylinder head or the exhaust valve fixed to the upper part of the cylinder liner must be removed.

  Current measurement methods measure cylinder gauges directly inside the cylinder liner. For this reason, it is necessary to remove the cylinder head or the exhaust valve. In a large two-stroke cycle crosshead type diesel engine with a cylinder diameter exceeding 500 mm, the diameter of the cylinder liner is large and the length of the cylinder liner is long, so that a person can enter the cylinder liner for measurement. Many. Since the temperature of the cylinder liner is sometimes high and it is difficult to escape, it is difficult to say that it is preferable for safety that a person enters the cylinder liner.

  Therefore, the current measurement method has the following drawbacks.

(A) It takes a lot of labor and time to remove the cylinder head and the exhaust valve.
(B) Moreover, since the diesel engine cannot be operated while these components are not attached, measurement may not be performed when the time during which the diesel engine can be stopped is short.
(C) It is not preferable in terms of safety that a person enters the cylinder liner because it is a high temperature environment and it is difficult to escape in an emergency.
Japanese Patent Laid-Open No. 11-248402 (FIGS. 8 and 9)

  The present invention has been made to solve such a problem. The object of the present invention is to reduce the maximum wear amount of the cylinder liner safely and shortly without removing the cylinder head or the exhaust valve. It is an object of the present invention to provide a cylinder liner maximum wear amount measuring method and a measuring instrument capable of accurately measuring time.

In the cylinder liner maximum wear amount measuring method according to claim 1 of the present application, when measuring the maximum wear amount of the cylinder liner in a two-stroke cycle crosshead type diesel engine, an abutment of a piston ring appears at the intake port portion of the cylinder liner. Then, a measuring device is installed in the joint and the reference joint dimension Lg0 is measured. Then, when the piston ring passes through the maximum wear point of the cylinder liner by rotating the crankshaft of the diesel engine, the measurement is performed. The maximum joint dimension Lgmax when the spring body provided in the container is most extended is stored, and further, the fluctuation value ΔLg is obtained by subtracting the reference joint dimension Lg0 from the maximum joint dimension Lgmax. According to the formula
D1max≈D1new + ΔLg / π
The cylinder liner diameter D1max at the maximum wear point is obtained. However, D1new is the diameter of a new cylinder liner.

  In the cylinder liner maximum wear amount measuring instrument according to claim 2 of the present application, a spring body is installed in a cylindrical measuring instrument body so that its free end protrudes outward from the opening end of the measuring instrument body. A pair of support guides along the axis O of the measuring instrument main body is provided on the front surface of the measuring instrument, a main scale is provided between the pair of support guides, and a waist-foldable wire attached to the free end of the spring body A vernier scale is provided that is inserted into the pair of support guides via the inside of the measuring instrument body and color-coded to the same length as the distance between the pair of support guides in the linear body. It is a feature.

  A cylinder liner maximum wear amount measuring instrument according to claim 3 of the present application is the cylinder liner maximum wear amount measuring instrument according to claim 2, wherein a yarn storage for accommodating the linear object is provided on the front surface of the measuring instrument main body, and the linear object pulled out from the yarn storage is provided. A yarn path changing guide for making a U-turn toward the support guide is provided.

  A cylinder liner maximum wear amount measuring instrument according to claim 4 of the present application is characterized in that, in claim 2, a plurality of legs are provided on the base side of the measuring instrument main body to secure the passage of the linear body. Is.

  A cylinder liner maximum wear amount measuring instrument according to claim 5 of the present application is the cylinder liner maximum wear amount measuring instrument according to claim 2, wherein a spring receiving part is provided on the base side or inside of the measuring instrument body, and a guide with a cylindrical collar is provided on the spring receiving part. It is characterized by being mounted.

The cylinder liner maximum wear measuring method of the present application is such that when measuring the maximum wear of the cylinder liner in a two-stroke cycle crosshead type diesel engine, an abutment of the piston ring appears at the intake port portion of the cylinder liner. A measuring instrument is attached to measure the reference joint size Lg0, and then the crankshaft of the diesel engine is rotated so that the piston ring passes through the maximum wear point of the cylinder liner. The maximum joint size Lgmax when the spring body is most extended is stored, and the variation value ΔLg is obtained by subtracting the reference joint size Lg0 from the maximum joint size Lgmax.
D1max≈D1new + ΔLg / π
Since the cylinder liner diameter D1max of the maximum wear point is obtained, the maximum wear amount of the cylinder liner can be measured safely and accurately in a short time without removing the cylinder head or the exhaust valve. It was. However, D1new is a new cylinder liner diameter.

  On the other hand, the cylinder liner maximum wear amount measuring instrument of the present application is installed in a cylindrical measuring instrument body so that the spring body protrudes outward from the opening end of the measuring instrument, and is mounted on the front surface of the measuring instrument body. A pair of support guides are provided along the axis O of the measuring instrument body, a main scale is provided between the pair of support guides, and a waist-foldable linear body attached to the free end of the spring body is provided. The cylinder liner of the present application is provided with a scale for the vernier that is inserted into the pair of support guides via the inside of the measuring instrument body and is color-coded to the same length as the distance between the pair of support guides on the linear body. Similar to the maximum wear amount measuring method, the maximum wear amount of the cylinder liner can be measured safely and accurately in a short time without removing the cylinder head or the exhaust valve.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Before that, the measurement principle of the present invention will be described.

Generally, the piston ring tends to spread along the wall surface of the cylinder liner. As shown in FIG. 11, when the outer peripheral length of the piston ring 104 is Lp and the diameter of the cylinder liner 102 is D1, the dimension Lg of the joint 105 of the piston ring 104 is expressed by the equation (1).
Lg = π × D1-Lp (1)

Therefore, when the outer peripheral length Lp of the piston ring 104 is known, if the dimension Lg of the joint 105 of the piston ring 104 can be measured, the diameter D1 of the cylinder liner 102 can be obtained from the equation (2).
D1 = (Lg + Lp) / π (2)

  Normally, the joint dimension Lg of the piston ring 104 is measured by a linear distance of the joint 105 of the piston ring 104, but strictly speaking, it is a distance on the circumference. However, since the joint dimension Lg of the piston ring 104 is smaller than the diameter D1 of the cylinder liner 102, the dimension measured in a straight line and the dimension on the circumference can be regarded as substantially the same.

  However, in this case, the outer circumferential length Lp of the piston ring 104 becomes shorter due to wear of the piston ring 104. The outer peripheral length Lp of the piston ring 104 cannot be measured unless the piston ring 104 is removed. If the outer peripheral length Lp of the piston ring 104 cannot be measured, it cannot be said that Lp is known. Therefore, this problem is solved as follows.

Assume that it is known that the wear of a portion of the cylinder liner 102 is so small that it can be ignored, and the cylinder liner diameter in this case is D10 (see FIG. 12). Further, the cylinder liner diameter at the maximum wear point is set to D1max (see FIG. 13). Further, the diameter of the new cylinder liner is D1new. D1new is a constant known value over the entire length of the cylinder liner. At this time,
D10≈D1new (3)
It can be regarded as.

The joint size of the piston ring 104 at the point D10 is Lg0, and the joint size of the piston ring 104 at the point D1max is Lgmax. Assume that the same piston ring can be seen against both D1max and D10. At this time,
Lp = π × D1max−Lgmax (4)
Lp = π × D10−Lg0
≈π × D1new-Lg0 (5)
It is.

Therefore, from the equations (4) and (5),
π × (D1max−D1new) ≈Lgmax−Lg0 (6)
It becomes.

here,
If ΔLg = Lgmax−Lg0,
π × (D1max−D1new) ≈ΔLg (7)
It becomes.

Therefore,
D1max≈D1new + ΔLg / π (8)
It becomes.

  Therefore, if ΔLg can be obtained by some method, the new cylinder liner diameter D1new is known, and therefore the cylinder liner diameter D1max at the maximum wear point can be easily obtained.

  The present invention has been achieved based on such findings. Hereinafter, embodiments of the present invention will be described.

  As shown in FIG. 1, a two-stroke cycle crosshead type diesel engine (hereinafter simply referred to as a diesel engine) 101 is usually provided with an intake port 103 below a cylinder liner 102. 3, when the joint 105 of the piston ring 104 appears in the portion of the intake port 103, the joint dimension of the piston ring 104 at that time can be measured. Reference numeral 106 denotes a piston, and 107 denotes an exhaust valve.

  Further, since the wear amount of the cylinder liner 102 at the intake port 103 is small, this portion is regarded as the D10 portion already described. Here, the joint of the piston ring 104 at the intake port 103 (reference portion) The dimension Lg0 can be measured using a cylinder liner maximum wear amount measuring instrument (hereinafter referred to as a measuring instrument) 11.

  Next, the crankshaft (not shown) of the diesel engine 101 is slowly rotated once, during which the joint size Lg of the piston ring is continuously monitored by the measuring instrument 1, and the maximum value Lgmax is recorded. If it is possible, the variation difference ΔLg (= Lgmax−Lg0) can be known. Although depending on the size of the diesel engine 101, the total length of the measuring instrument 11 is about 10 to 20 mm.

  As shown in FIG. 5, the measuring instrument 11 is provided with a coil spring 13 that is a kind of a spring body in a cylindrical measuring instrument body 12. The coil spring 13 is usually longer than the measuring instrument main body 12, and when the base portion 13 b is attached to the end plate-like spring receiving portion 14 provided on the base portion side of the measuring instrument main body 12, the tip end portion 13 a of the coil spring 13. Protrudes outward from the opening end 15 of the measuring instrument main body 12.

  As the spring body, a cylindrical body such as a coil spring or a bamboo spring is desirable. Further, the spring receiving portion is not limited to the base portion of the measuring instrument main body 12 and may be provided inside the measuring instrument main body 12.

  The measuring instrument main body 12 is formed in a cylindrical shape having a rectangular or square cross section, and a pair of support guides 17a and 17b and a main scale 18 are provided on the front surface 16 as shown in FIG. The pair of support guides 17a and 17b are installed at a predetermined interval in a direction along the axis O of the measuring instrument main body 12, and the main scale 18 is between the pair of support guides 17a and 17b and the shaft It is provided in a direction orthogonal to the core O. A plurality of main scales 18 are provided at intervals of 1 mm, for example, five. The scale 18 for the main scale is assigned numerical numbers “0”, “1”, “2”, “3”, “4” in order from the upper level to the lower level.

Installation support guide 17a, 17b is obtained by cutting the circular cross-section pipe or tube to a predetermined length, in the figure, the upper support guides 17a, move the lower end thereof to the scale 18 ₀ "0" is, the lower support guide 17b is disposed to fit the upper end to the scale 18 ₄ "4".

  The measuring instrument main body 12 is provided with a thread retainer 21 that accommodates the linear body 20 on the front surface 16 thereof, and a yarn path that causes the linear body 20 drawn from the thread retainer 21 to U-turn toward the upper support guide 17a. A change guide 22 is provided. Further, the yarn path changing guide 22 is provided with a disk-shaped dropout prevention plate 24 at the front end portion of the round bar-shaped shaft 23.

  As shown in FIG. 5, the measuring instrument main body 12 has a cylindrical collar guide 25 attached to the center of the spring receiving portion 14, and the linear body 20 on both sides of the measuring instrument main body 12 as shown in FIG. 4. Rib-shaped legs or protrusions 26 for securing the passage 29 are provided.

  As shown in FIG. 5, the coil spring 13 has its tip end bent in an arc shape to form a linear body mounting portion 31, and the tip end of the linear body 20 is fixed to the linear body mounting portion 31. . The distal end portion 13 a of the coil spring 13 is refracted in the shape of a hiragana “no” in plan view so that the linear body attachment portion 31 is positioned at the axial core portion of the coil spring 13.

  The linear body 20 attached to the linear body attaching portion 31 of the coil spring 13 is guided to the pair of support guides 17a and 17b through the central space portion 32 and the flanged guide 25 of the coil spring 13, and further to the yarn. It is accommodated in the threadhouse 21 via the road change guide 22.

  The linear body is preferably a monofilament made of synthetic fiber such as polypropylene or nylon or a spun yarn that is easily folded, or a thin body such as a necklace made of metal.

  As shown in FIG. 6, the linear body 20 is provided with scales 28 for vernier that are color-coded in advance with the same length as the distance between the pair of support guides 17a and 17b. For example, when the main scale 18 is 4 mm, it is preferable to divide the color every 4 mm. As an example, color coding is performed as shown in FIG.

  That is, the linear body 20 is colored in order of purple A, red B, blue C, yellow D, green E, and black F, for example, every 4 mm with respect to a point 0 having a yarn length of 0 mm. Therefore, as the linear body 20 is drawn out by the coil spring 13, it appears in order from purple A to black F.

  A point 0 where purple A begins is defined as “a point having a thread length of 0 mm”. Similarly, the boundary a between purple A and red B is a “point with a thread length of 4 mm”. Hereinafter, the definition is the same. That is, the boundary b between the red B and the blue C is a “point with a thread length of 8 mm”. The boundary c between the blue C and the yellow D is a “point with a thread length of 12 mm”. The boundary d between the yellow D and the green E is a “point with a thread length of 16 mm”. A boundary e between the green E and the black F is a “point having a thread length of 20 mm”. The portion f where the black F ends is a “point having a thread length of 24 mm”.

  Next, the cylinder liner maximum wear amount measuring operation using the measuring instrument will be described.

  As shown in FIG. 2, when the joint 105 of the piston ring 104 appears in the portion of the intake port 103 of the cylinder liner 102, the measuring instrument 11 is inserted into the joint 105 of the piston ring 104. At this time, the linear body 20 is inserted so as not to loosen, and the feeding amount Lg0 of the linear body 20 at that time is recorded.

For example, when the measuring instrument 11 is inserted into the joint 105 of the piston ring 104, it is assumed that the boundary a between purple A and red B is at 2 mm on the main scale 18 as shown in FIG. The boundary a between the purple A and the red B is a “point of 4 mm in thread length”, and this has advanced to 2 mm of the scale 18 for the main scale.
Lg0 = 4 + 2 = 6mm (9)
It is.

Next, the crankshaft (not shown) of the diesel engine 11 is rotated once, and the maximum feed amount Lgmax of the linear body 10 accompanying the extension of the coil spring 13 is recorded. Thus, the relative opening of the joint when the piston ring 104 reaches the maximum wear point of the cylinder liner 102 from the state in which the measuring instrument 11 is first inserted into the joint 105 of the piston ring 104 is Lgmax−Lg0. ,
Lgmax−Lg0 = ΔLg (10)
It becomes.

  That is, when the crankshaft (not shown) of the diesel engine 101 is rotated once, as shown in FIG. 8, the coil spring 13 expands following the amount of wear of the cylinder liner 102, and the threadhouse 21 of the measuring instrument 11. The linear body 20 is drawn out from the above. Since the linear body 10 drawn out from the yarn store 21 is supported by the pair of support guides 17a and 17b, the maximum wear amount of the cylinder liner 102 is recorded.

  Thereafter, as the piston ring 104 returns to the intake port 103, the coil spring 13 contracts as shown in FIG. 9, but the linear body 20 breaks in the central space 32 of the coil spring 13. Therefore, the contraction of the coil spring 13 does not retroactively affect the portion of the linear body 20 supported by the pair of support guides 17a and 17b. The operation of the linear body 20 in FIGS. 7 to 9 is schematically shown in FIG.

Accordingly, when the color boundary of the linear body 20 of the measuring instrument 11 and the main scale 18 are seen, for example, as shown in FIG. 9, the boundary c of blue C and yellow D is the main scale 18. Suppose that it is at 3 mm. Since the boundary c between the blue C and the yellow D is a “point with a thread length of 12 mm”, Lgmax is
Lgmax = 12 + 3 = 15 mm (11)
I understand that.

Therefore,
ΔLg = Lgmax−Lg0 = 15−6 = 9 mm (12)
It is.

For example, if the diameter D1new of a new cylinder liner is 800 mm, the diameter D1max of the maximum wear point of the cylinder liner 102 is
D1max≈D1new + ΔLg / π
= 800 mm + 9 mm / π = 802.9 mm (13)
It becomes.

  The joint 105 of the piston ring 104 is not always in a position where the measuring instrument 11 can be inserted, but can be inserted by looking at the position of the joint 105 of the piston ring 104 when the diesel engine 101 is stopped. Even when the measurement is performed at any time, a measurement value sufficiently useful for the maintenance of the diesel engine 101 can be obtained.

It is sectional drawing which shows the principal part of a 2-stroke cycle crosshead type diesel engine. It is a side view including a partial cross section of a cylinder liner. It is XX sectional drawing of FIG. It is a front view of the measuring device which concerns on this invention. It is a longitudinal cross-sectional view of the measuring device which concerns on this invention. It is a top view of a linear body. It is explanatory drawing which shows the state which attached the measuring device to the joint of a piston ring. It is explanatory drawing which shows a state when a measuring device reaches | attains the maximum wear point of a cylinder liner. It is explanatory drawing which shows a state when a measuring device returns to an initial position. It is a schematic diagram which shows operation | movement of a linear body. It is explanatory drawing which shows the relationship between the outer periphery length Lp of a piston ring, the diameter D1 of a cylinder liner, and the joint dimension Lg of a piston ring. It is explanatory drawing which shows the relationship between the outer periphery length Lp0 of the piston ring in the minimum wear point, the diameter D10 of a cylinder liner, and the joint dimension Lg0 of a piston ring. It is explanatory drawing which shows the relationship between the outer periphery length Lp0 of the piston ring in the maximum wear point, the diameter D1max of a cylinder liner, and the joint dimension Lgmax of a piston ring.

Explanation of symbols

12 Measuring instrument body 13 Spring body 13a Free end 15 of spring body Main body opening ends 17a and 17b Support guide 18 Scale for main scale 20 Linear body 28 Scale for sub-scale

Claims (5)

When measuring the maximum amount of cylinder liner wear in a two-stroke cycle crosshead type diesel engine, a piston ring abutment appears at the intake port of the cylinder liner, and a measuring instrument is installed in the abutment to provide a standard abutment dimension. Lg0 is measured, and then when the piston ring passes through the maximum wear point of the cylinder liner by rotating the crankshaft of the diesel engine, the maximum joint when the spring body provided in the measuring instrument is most extended The dimension Lgmax is stored, and further, the variation value ΔLg is obtained by subtracting the reference joint dimension Lg0 from the maximum joint dimension Lgmax.
D1max≈D1new + ΔLg / π
A cylinder liner maximum wear amount measuring method, wherein a cylinder liner diameter D1max of a maximum wear point is obtained.
However, D1new is the diameter of a new cylinder liner.   A spring body is installed in a cylindrical measuring instrument body so that its free end protrudes outward from the opening end of the measuring instrument body, and a pair of support guides along the axis O of the measuring instrument body on the front surface of the measuring instrument body And a pair of support guides via a measuring instrument main body provided with a linear body that can be folded at the free end of the spring body. A cylinder liner maximum wear amount measuring instrument that is provided with a scale for a vernier that is inserted into the linear body and is color-coded to the same length as the distance between the pair of support guides.   A yarn path for accommodating the linear body is provided on the front surface of the measuring instrument main body, and a yarn path changing guide for making a U-turn toward the support guide is provided for the linear body drawn out from the yarn storage. Item 3. The cylinder liner maximum wear amount measuring instrument according to item 2.   3. The cylinder liner maximum wear amount measuring instrument according to claim 2, wherein a plurality of legs are provided on the base side of the measuring instrument main body to secure the passage of the linear body.   3. The cylinder liner maximum wear amount measuring instrument according to claim 2, wherein a spring receiving part is provided on the base side or inside of the measuring instrument body, and a guide with a cylindrical collar is attached to the spring receiving part.

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