Diesel engine cylinder center line and guide plate parallelism measuring method

Abstract

The invention discloses a diesel engine cylinder center line and guide plate parallelism measuring method comprising the following steps: installing a measuring auxiliary device in a slide groove used for installing a piston slide block on a diesel engine guide plate, moving the measuring auxiliary device to the highest position of the slide groove, and adjusting the target center of a cross light target of the measuring auxiliary device to coincide with the diesel engine center line; then, the measurement auxiliary device is moved downwards by taking the highest cross target center position as a reference point, and the measurement auxiliary device is moved to the lowest position of the sliding groove to measure the transverse deviation and the longitudinal deviation of the cross target center at the position away from the reference point; and the non-parallelism between the center line of the cylinder of the diesel engine and the working surface of the guide plate is calculated according to the measured transverse deviation and longitudinal deviation, so that the measurement precision of the parallelism of the guide plate is improved, and the measurement efficiency is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a method for measuring the parallelism between the cylinder center line of a diesel engine and a guide plate. Background Art

[0002] In the repair of a two-stroke diesel engine of a ship, measuring the parallelism between the cylinder center line and the guide plate is an important item. In the past, the method of measuring the clearance was adopted, and a feeler gauge was used to measure the clearance between the upper guide plate and the crosshead. First, the crosshead was pushed against one end of the guide plate, and a feeler gauge with an appropriate thickness was selected and inserted vertically between the upper guide plate and the crosshead from both sides of the crosshead to measure the clearances at three points, namely the front, middle, and rear of the crosshead. Then, the crosshead was pushed against the other end of the guide plate, and the clearance between the crosshead and the upper guide plate was measured in the same way. This is time-consuming and laborious, and the measurement accuracy is not high, resulting in an improper adjustment of the guide plate clearance, which will increase the unidirectional friction between the cylinder wall of the diesel engine and the piston ring, affecting the mechanical efficiency and service life of the diesel engine. Summary of the Invention

[0003] In view of this, the present invention provides a method for measuring the parallelism between the cylinder center line of a diesel engine and a guide plate to solve the problems that the traditional clearance measurement method has low measurement efficiency and low measurement accuracy, resulting in an improper adjustment of the guide plate clearance, further increasing the unidirectional friction between the cylinder wall of the diesel engine and the piston ring, and affecting the mechanical efficiency and service life of the diesel engine.

[0004] A method for measuring the parallelism between the cylinder center line of a diesel engine and a guide plate specifically includes the following steps:

[0005] S1. Install a collimator telescope on the cylinder of the diesel engine so that the cross center of the collimator telescope is located on the center line of the cylinder of the diesel engine;

[0006] S2. Install a measurement auxiliary device in the chute for installing the piston slider on the guide plate of the diesel engine;

[0007] The measurement auxiliary device includes a slide plate clamped in the chute, a bracket vertically fixed on the slide plate, a light target seat fixed at the end of the bracket and arranged vertically, and a cross light target placed on the upper surface of the light target seat;

[0008] S3. Move the slide plate along the chute to move the entire measurement auxiliary device to the highest position of the chute;

[0009] S4. Adjust the position of the cross light target on the light target seat, and at the same time observe with the collimator telescope to make the center of the target of the cross light target coincide with the cross center of the collimator telescope;

[0010] S5. Keep the position of the crosshair light target unchanged, slowly move the measurement auxiliary device downward along the chute to the lowest position, observe the lateral deviation and longitudinal deviation of the crosshair center of the crosshair light target from its cross center at this time using a collimator telescope, and calculate the non-parallelism between the center line of the diesel engine cylinder and the working surface of the guide plate according to the observation results.

[0011] Preferably, the specific steps of installing a collimator telescope on the diesel engine cylinder in step S1 are as follows:

[0012] Install an adjustable light target on the upper end face and the lower end face of the diesel engine cylinder respectively, and adjust the crosshair centers of the two adjustable light targets to the center line of the diesel engine cylinder;

[0013] Install a collimator telescope on the upper end face of the diesel engine cylinder so that the cross center of the collimator telescope coincides with the crosshair centers of the upper and lower adjustable light targets;

[0014] Remove the adjustable light targets on the upper and lower end faces of the diesel engine cylinder.

[0015] Preferably, a layer of protective soft pad is provided between the mounting contact surface of the bracket of the adjustable light target and the cylinder liner of the cylinder.

[0016] Preferably, a plurality of length-adjustable adjusting rods are evenly distributed on the upper surface of the light target base. The adjusting rods are arranged horizontally and their ends are fixed on the support frame, and the support frame is fixed on the light target base.

[0017] Preferably, the thickness of the slide plate is 0.01 mm - 0.02 mm smaller than the width of the chute, the cross section of the bracket is concave-shaped, and the light target base is cylindrical.

[0018] Preferably, the calculation formula for the non-parallelism γ between the center line of the diesel engine cylinder and the working surface of the guide plate is:

[0019]

[0020] Wherein, L is the moving distance of the slide plate from the highest position to the lowest position of the chute, a is the lateral deviation of the crosshair center of the crosshair light target from the cross center of the collimator telescope when the slide plate is at the lowest position of the chute, and b is the longitudinal deviation of the crosshair center of the crosshair light target from the cross center of the collimator telescope when the slide plate is at the lowest position of the chute.

[0021] Preferably, the diesel engine is a two-stroke civilian diesel engine.

[0022] The beneficial effects of the present invention are:

[0023] In the present invention, a measurement auxiliary device is installed in the chute for installing the piston slider on the diesel engine guide plate. The measurement auxiliary device is moved to the highest position of the chute, and the center of the crosshair target thereof is adjusted to coincide with the center line of the diesel engine. Then, taking the position of the crosshair target at the highest position as the reference point, the measurement auxiliary device is moved downward, and the measurement auxiliary device is moved to the lowest position of the chute to measure the lateral deviation and longitudinal deviation of the crosshair target at this position from the reference point. Then, according to the measured lateral deviation and longitudinal deviation, the non-parallelism between the cylinder center line of the diesel engine and the working surface of the guide plate is calculated. This not only improves the measurement accuracy of the guide plate parallelism but also improves the measurement efficiency, effectively solving the problems that the traditional clearance measurement method has low measurement efficiency and accuracy, resulting in the adjustment of the guide plate clearance not in place, further increasing the unilateral friction between the cylinder wall of the diesel engine and the piston ring, and affecting the mechanical efficiency and service life of the diesel engine. At the same time, the measurement auxiliary device adopted in this application has a simple structure, low manufacturing cost, convenient operation, and can be reused, greatly reducing the construction cost of the ship and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic installation diagram of the measurement auxiliary device.

[0026] The meanings of the reference numerals in the drawings are as follows:

[0027] 1 is a slide plate, 2 is a bracket, 3 is an adjusting rod, 4 is a target, 5 is a target seat, and 6 is a guide plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be described through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0029] The terms used in this disclosure are only for the purpose of describing specific embodiments and are not intended to limit this disclosure. The singular forms "a", "the", and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] In order to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the drawings.

[0033] The present invention provides a method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate, which specifically includes the following steps:

[0034] S1. Install a collimator telescope on the diesel engine cylinder so that the cross center of the collimator telescope is located on the center line of the diesel engine cylinder.

[0035] Specifically, the specific steps for installing the collimator telescope are as follows:

[0036] Install an adjustable light target on the upper and lower end faces of the diesel engine cylinder respectively, and adjust the target centers of the two adjustable light targets to the center line of the diesel engine cylinder, that is, fix the brackets of the adjustable light targets on the upper and lower ends of the diesel engine cylinder liner respectively. The deviation between the target centers of the upper and lower adjustable light targets and the center line of the diesel engine cylinder does not exceed 0.005 mm. Preferably, in order to prevent the brackets of the adjustable light targets from scratching the inner surface of the cylinder liner, a layer of protective soft pad can be provided between the installation contact surfaces of the brackets of the adjustable light targets and the cylinder liner;

[0037] Then, install a collimator telescope on the upper end face of the diesel engine cylinder so that the cross center of the collimator telescope coincides with the target centers of the upper and lower adjustable light targets;

[0038] After the collimator telescope is adjusted, remove the adjustable light targets on the upper and lower end faces of the diesel engine cylinder.

[0039] The diesel engine is a two-stroke civilian diesel engine.

[0040] S2. Install a measurement auxiliary device in the chute of the guide plate 6 of the diesel engine for installing the piston slider.

[0041] The measurement auxiliary device includes a slide plate 1 clamped in a chute, a bracket 2 vertically fixed on the slide plate 1, a light target seat 5 fixed at the end of the bracket 2 and arranged vertically, and a cross light target 4 placed on the upper surface of the light target seat 5.

[0042] Specifically, the slide plate 1 is a square flat plate, the side length of which is 0.01 mm - 0.02 mm smaller than the width of the piston slider, and the thickness of the slide plate 1 is 0.01 mm - 0.02 mm smaller than the width of the chute.

[0043] The cross-section of the bracket 2 is concave-shaped, the bracket 2 is arranged horizontally, and it is vertically welded to the plate surface of the slide plate 1.

[0044] The light target seat 5 is cylindrical, the light target seat 5 is arranged vertically, and its outer circle is welded and fixed to the other end of the bracket 2.

[0045] Preferably, a plurality of length-adjustable adjusting rods 3 are evenly distributed on the upper surface of the light target seat 5. The adjusting rods 3 are arranged horizontally and their ends are fixed on a support frame. The support frame is fixed on the light target seat 5, that is, the adjusting rods 3 are fixed on the upper surface of the light target seat 5 through the support frame. The adjusting rods 3 are used to adjust the position of the cross light target 4.

[0046] S3. Move the slide plate 1 along the chute to move the entire measurement auxiliary device to the highest position of the chute.

[0047] S4. Adjust the position of the cross light target 4 on the light target seat 5, and at the same time observe with a collimating telescope to make the center of the cross of the cross light target 4 coincide with the cross center of the collimating telescope, that is, adjust the lengths of the adjusting rods 3 at different positions respectively, so that each adjusting rod 3 pushes the cross light target 4 to move, thereby adjusting its center of the target to coincide with the cross center of the collimating telescope.

[0048] S5. Keep the position of the cross light target 4 unchanged, and slowly move the measurement auxiliary device along the chute to the lowest position. Use the collimating telescope to observe the lateral deviation and longitudinal deviation of the center of the cross of the cross light target 4 from its cross center at this time, and calculate the non-parallelism between the center line of the diesel engine cylinder and the working surface of the guide plate 6 according to the observation results.

[0049] The calculation formula for the non-parallelism γ between the center line of the diesel engine cylinder and the working surface of the guide plate 6 is:

[0050]

[0051] Wherein, L is the moving distance of the slide plate 1 from the highest position to the lowest position of the chute, a is the lateral deviation of the center of the cross of the cross light target 4 from the cross center of the collimating telescope when the slide plate 1 is at the lowest position of the chute, and b is the longitudinal deviation of the center of the cross of the cross light target 4 from the cross center of the collimating telescope when the slide plate 1 is at the lowest position of the chute.

[0052] In this embodiment, the above-mentioned skateboard 1, bracket 2, light target seat 5, adjusting rod 3, and the support frame of the adjusting rod 3 are all made of copper. The cross light target is made of transparent organic glass, and its outer circumference is coated with a layer of stainless steel. The center of the transparent organic glass is engraved with a bull's-eye.

[0053] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. A method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate, characterized in that: The specific steps include: S1, install a collimating telescope on the diesel engine cylinder so that the cross center of the collimating telescope is located on the center line of the diesel engine cylinder; S2, installing a measuring auxiliary device in a slide groove of a guide plate (6) of a diesel engine for installing a piston slide block; The measurement auxiliary device comprises a slide plate (1) clamped in a slide groove, a bracket (2) vertically fixed on the slide plate (1), an optical target seat (5) fixed to the end of the bracket (2) and vertically arranged, and a cross optical target (4) placed on the upper surface of the optical target seat (5); S3, moving the slide plate (1) along the slide slot to move the entire measurement auxiliary device to the highest point of the slide slot; S4, adjusting the position of the cross light target (4) on the light target holder (5), and observing with a collimating telescope at the same time, so that the center of the cross light target (4) coincides with the center of the cross of the collimating telescope; S5, keeping the position of the cross light target (4) fixed, slowly move the measurement auxiliary device downward along the slide groove to the lowest point, use the collimating telescope to observe the lateral deviation and longitudinal deviation of the center of the cross light target (4) from the center of its cross, and calculate the non-parallelism between the center line of the diesel engine cylinder and the working surface of the guide plate (6) based on the observation results.

2. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 1, characterized in that: The specific steps of installing the collimating telescope on the diesel engine cylinder in step S1 are: An adjustable light target is installed on the upper end surface and the lower end surface of the diesel engine cylinder respectively, and the bull's centers of the two adjustable light targets are adjusted to the center line of the diesel engine cylinder; A collimating telescope is installed on the upper end surface of the diesel engine cylinder so that the cross center of the collimating telescope coincides with the bull's-eyes of the upper and lower adjustable light targets; Remove the adjustable light targets on the upper and lower end surfaces of the diesel engine cylinder.

3. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 2, characterized in that: A layer of protective cushion is arranged between the bracket of the adjustable light target and the mounting contact surface of the cylinder sleeve.

4. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 1, characterized in that: A plurality of length-adjustable adjustment rods (3) are evenly distributed on the upper surface of the optical target seat (5); the adjustment rods (3) are arranged transversely and their ends are fixed on a support frame, and the support frame is fixed on the optical target seat (5).

5. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 1, characterized in that: The thickness of the slide plate (1) is 0.01 mm to 0.02 mm smaller than the width of the slide groove; the cross section of the bracket (2) is in a concave shape; and the optical target seat (5) is cylindrical.

6. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 1, characterized in that: The calculation formula for the non-parallelism γ between the center line of the diesel engine cylinder and the working surface of the guide plate (6) is: Wherein, L is the movement of the slide plate (1) from the highest point to the lowest point of the slide slot, a is the lateral deviation of the center of the cross light target (4) from the cross center of the collimating telescope when the slide plate (1) is at the lowest point of the slide slot, and b is the longitudinal deviation of the center of the cross light target (4) from the cross center of the collimating telescope when the slide plate (1) is at the lowest point of the slide slot.

7. The method for measuring the parallelism between the center line of a diesel engine cylinder and a guide plate according to claim 1, characterized in that: The diesel engine is a two-stroke civilian diesel engine.

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