A non-contact engine cylinder liner wear measuring device

Abstract

The utility model belongs to the field of engine cylinder sleeve life prediction discloses a non -contact type engine cylinder sleeve abrasion measuring device, include: laser emission part, a pair of detection department and processing module, laser emission part is used to emit the laser beam that a plurality of laser light rays of different orientations are composed to engine cylinder sleeve, two detection department is towards laser beam setting, is used to receive the emission two kinds of results that same laser light ray irradiation on engine cylinder sleeve from different positions, the signal output end of detection department is connected the signal output end of processing module in common, is used to receive two kinds of emission signals of different positions, and the output cylinder body form result is through laser beam and double detection department cooperation, need not contact engine cylinder sleeve inner wall to carry out detection, is favorable to reduce the secondary damage that traditional contact type measurement can cause to surface, and the engine cylinder sleeve is modeled when detecting, record the detection result in this way, in order to facilitate comparison next time.

Description

Technical Field

[0001] This disclosure pertains to the field of engine cylinder liner life prediction, specifically relating to a non-contact engine cylinder liner wear measurement device. Background Technology

[0002] As the "heart" of a ship, the performance and lifespan of the engine cylinder liner, a core component of the marine engine, directly affect the ship's operational safety and economic efficiency. Under harsh conditions of long-term high temperature, high pressure, and corrosive combustion gases, the inner wall of the engine cylinder liner will gradually develop various deformations due to wear, corrosion, and scratches, such as scratches, pitting, and peeling. The accumulation of these deformations will lead to a decrease in engine power, an increase in fuel consumption, and oil contamination. In severe cases, it can even cause failures such as cylinder scoring and seizure, resulting in huge economic losses and safety risks.

[0003] Therefore, it is necessary to inspect the cylindricity and flatness of the inner wall of the engine cylinder liner. The traditional method is to use an inside micrometer to measure the diameter data of a certain area to estimate the coaxiality of the inner wall of the engine cylinder liner. However, obtaining diameter data from only a few specific points makes it difficult to fully reflect the morphology of the inner wall surface. Therefore, the error of the test results is relatively large, and the inner wall of the engine cylinder liner is easily scratched during the micrometer contact process. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this disclosure is to provide a non-contact engine cylinder liner wear measurement device, which solves the problem that existing technologies rely on contact measurement or subjective experience judgment, resulting in incomplete detection data and thus large errors in the detection results.

[0005] The objective of this disclosure can be achieved through the following technical solutions:

[0006] A non-contact engine cylinder liner wear measurement device includes: a laser emitting unit, a pair of detection units, and a processing module;

[0007] The laser emitting unit is used to emit a laser beam consisting of multiple laser beams in different directions toward the engine cylinder liner;

[0008] Two detection units are positioned facing the laser beam to receive two results of the same laser beam illuminating the engine cylinder liner from different positions.

[0009] The signal output terminals of the detection unit are connected to the signal output terminals of the processing module to receive two types of transmitted signals from different positions and output the cylinder shape results.

[0010] In some disclosures, the detection unit is an industrial camera, which is symmetrically arranged on both sides of the laser emitting unit.

[0011] In some publicly available examples, multiple detection units and laser emission units are integrated into the same housing.

[0012] In some disclosures, the inner wall of the engine cylinder liner is fitted with removable reflective markings.

[0013] In some disclosures, the reflective markers are connected to the engine cylinder liner by adhesive bonding or magnetic adsorption.

[0014] In some disclosures, the reflective markings are asymmetrically and non-uniformly distributed on the inner wall surface of the engine cylinder liner.

[0015] In some disclosures, the density of the reflective markers is such that at least four identifiable reflective markers exist simultaneously within the field of view of the detection unit during scanning.

[0016] In some disclosures, the laser beam emitted by the laser emitting unit has a shape that includes one of the following patterns: dot matrix, linear array, or grid-like light spots.

[0017] In some disclosures, a supplementary light is fixed to the side of the housing near the detection unit.

[0018] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0019] A fixed connection refers to a connection in which parts or components are fixed in place and there is no relative movement between them;

[0020] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0021] Threaded connections are a type of detachable fixed connection with advantages such as simple structure, reliable connection, and convenient assembly and disassembly. They are widely used in mechanical engineering and connection structure fields.

[0022] A sliding connection is a connection between parts that allows the parts to slide against each other.

[0023] The beneficial effects of this disclosure are:

[0024] 1. By using a laser beam in conjunction with dual detection units, inspection can be performed without contacting the inner wall of the engine cylinder liner. This helps to reduce secondary damage to the surface that may be caused by traditional contact measurement. The engine cylinder liner being inspected is also modeled during inspection to record the inspection results for future comparison.

[0025] 2. Since the shape of the inner wall of the engine cylinder liner is modeled by the change of light after the laser beam is irradiated on it, the device is in a non-contact state with the inner wall of the steel sleeve during the process, which helps to reduce the risk of scratching the inner wall of the engine cylinder liner during inspection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this disclosure;

[0028] Figure 2 This is a schematic diagram of the overall structure from another perspective of an embodiment of this disclosure;

[0029] Figure 3 This is a schematic diagram of the detection unit according to an embodiment of the present disclosure;

[0030] Figure 4 This is a schematic diagram of the connection structure of the detection unit, the laser emitting unit, and the processing module according to an embodiment of this disclosure;

[0031] In the diagram: 1. Laser emitting unit; 2. Detection unit; 3. Processing module; 4. Supplemental light; 5. Reflective marker; 6. Engine cylinder liner; 7. Housing. Detailed Implementation

[0032] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0033] Please refer to Figures 1 to 4 A non-contact engine cylinder liner wear measurement device includes: a laser emitting unit 1, a pair of detection units 2 and a processing module 3;

[0034] The laser emitting unit 1 is used to emit a laser beam composed of multiple laser beams in different directions towards the engine cylinder liner 6;

[0035] Two detection units 2 are positioned facing the laser beam to receive two results of the same laser beam illuminating the engine cylinder liner 6 from different positions;

[0036] The signal output terminals of the detection unit 2 are connected to the signal output terminals of the processing module 3 to receive two types of transmission signals from different positions and output the cylinder shape results.

[0037] In use, the laser emitting unit 1 is positioned facing the inner wall of the engine cylinder liner 6. At this time, the laser beam emitted by the laser emitting unit irradiates the inner wall of the engine cylinder liner 6. When the inner wall of the engine cylinder liner 6 is in a good condition (such as a smooth curved surface or a smooth flat surface), a regular diffuse reflection spot is formed on the inner wall of the engine cylinder liner 6. The position of the device is adjusted so that the receiving range of the two detection units 2 includes the area where the laser beam irradiates the inner wall of the engine cylinder liner 6.

[0038] When the laser beam irradiates the inner wall of the engine cylinder liner 6, if there are irregular protrusions or depressions on the inner wall of the engine cylinder liner 6, the reflected light path, light spot shape or light intensity distribution of the laser beam will change after irradiating the irregular protrusions or depressions.

[0039] This change will be captured by the detection units 2 at different spatial positions, and because the two detection units 2 have different viewing angles, the "changed reflection signals" they receive will be different.

[0040] Processing module 3 is the core computing unit of the device, and it may include a processor and a memory. The processor may be a general-purpose or special-purpose computing chip such as a microcontroller, microprocessor, or digital signal processor.

[0041] The memory contains a computer program and a standard engine cylinder liner 6 three-dimensional model database. The standard engine cylinder liner 6 three-dimensional model database contains three-dimensional data of the inner wall of the engine cylinder liner 6 in its intact state, serving as a comparison benchmark.

[0042] Please refer to Figure 4 After receiving the two different reflected signals from different locations, processing module 3 combines point cloud data processing software (Trimble RealWorks) with the modeling module to calculate the current morphology of the inner wall of the engine cylinder liner 6. This includes determining the location, size, and type of deformation (protrusion or depression), modeling the current engine cylinder liner 6, and finally comparing it with the model of a standard engine cylinder liner 6 in the database. By detecting the deformation state and comparing it with a standard-sized engine cylinder liner 6, the cylindricity of the current engine cylinder liner 6 and its lifespan can be determined.

[0043] Please refer to Figures 1 to 3 The detection unit 2 is an industrial camera, which is symmetrically arranged on both sides of the laser emitting unit 1.

[0044] In use, the relative position between the laser emitter and the industrial camera is fixed. Two symmetrically arranged industrial cameras synchronously capture images of the deformation of the laser beam on the inner wall of the engine cylinder liner 6 from different angles. Based on the triangulation method of binocular stereo vision, the processing module 3 accurately reconstructs the microscopic three-dimensional morphology of the inner wall of the engine cylinder liner 6 by calculating the positional differences of tens of thousands of feature points in the two images.

[0045] Please refer to Figure 3 Multiple detection units 2 and laser emitting units 1 are integrated on the same housing 7.

[0046] When in use, the image acquisition unit, the detection unit 2 and the laser emitting unit 1 are all integrated on the same housing 7. At this time, the relative positions of the multiple detection units 2 and the laser emitting unit 1 on the housing 7 are fixed. Therefore, the positions of the two detection units 2 and the distance between them are fixed and known.

[0047] Please refer to Figures 1 to 2 The inner wall of the engine cylinder liner 6 is fitted with removable reflective markings 5;

[0048] During the inspection, the operator places reflective markers 5 on the inner wall surface of the engine cylinder liner 6. The position of the same reflective marker 5 in the field of view of the two detection units 2 is observed. At this time, a triangle is formed between the center point of the two detection units 2 and the reflective marker 5. The position of the center point of the two detection units 2 is fixed and known. When the scanner's camera captures these reflective markers 5, the system identifies these points with known shapes and sizes, and, combined with the principle of binocular vision, can calculate the scanner's own spatial position (X, Y, Z coordinates) inside the engine cylinder liner 6 in real time.

[0049] The position between the detection device and the engine cylinder liner 6 is located using reflective marker 5;

[0050] Each change in position of the detection unit 2 and the laser causes the acquisition unit to collect a local, fragmented data segment. By continuously tracking the marker points, the system generates a series of pose data for the detection unit 2 (P1, P2, P3...). Each pose acts as a "timestamp" and a "spatial stamp." Using point cloud data processing software (Trimble RealWorks), all the local point cloud data collected at different times and from different angles are received and accurately converted into a unified global coordinate system, thus "stitching" them together into a complete and seamless 3D model.

[0051] Please refer to Figure 1 The reflective markings 5 ​​are connected to the engine cylinder liner 6 by adhesive bonding or magnetic adsorption.

[0052] When the reflective marker 5 is fixed to the inner wall of the engine cylinder liner 6 with adhesive, the adhesive is deactivated by high temperature, making it easy to remove the reflective marker 5 for repeated use.

[0053] The reflective marker 5 is magnetic. When the object being inspected is a steel object, the magnetic marker can be used to fix the reflective marker 5 to the engine cylinder liner 6 more easily, making it easy to stick and peel off, and thus easy to reuse.

[0054] Please refer to Figures 1 to 2 The reflective markings 5 ​​are asymmetrically and non-uniformly distributed on the inner wall surface of the engine cylinder liner 6.

[0055] The arrangement of the reflective markers 5 on the inner wall circumference is not centrally symmetrical or axially symmetrical. The reflective markers 5 are arranged in an irregular order, which helps to reduce the problem of positioning confusion or mismatch that may occur during image recognition and improves the reliability and accuracy of detection.

[0056] Please refer to Figures 1 to 2 The density of the reflective markers 5 is such that during the scanning process, the detection unit 2 has at least four identifiable reflective markers 5 in its field of view at the same time.

[0057] Since determining the position and orientation of a detection unit 2 requires the two-dimensional and three-dimensional positional relationship of three points, ensuring the presence of four (non-coplanar) marker points within the field of view of the detection unit 2 helps to achieve continuous data splicing, thereby constructing a relatively complete three-dimensional model of the inner wall of the engine cylinder liner 6, reducing the possibility of deviations in data splicing due to the temporary loss of marker points, and improving the accuracy of measurement.

[0058] The laser beam emitted by the laser emitting unit 1 has a shape that includes one of the following patterns: dot matrix, linear array, or grid-like light spots.

[0059] Dot matrix, line matrix, or grid-like light spots—these specific, regular light spot patterns (different from ordinary speckle or surface light) can greatly improve the accuracy of identifying micro-deformations (such as scratches and pits) on the inner wall of the engine cylinder liner 6 and the efficiency of three-dimensional reconstruction.

[0060] Please refer to Figure 3 A supplementary light 4 is fixed on the side of the housing 7 near the detection part 2.

[0061] In use, the supplementary light 4 will provide the necessary light source for the detection unit 2 when the light is insufficient, so that the scanner can work without relying on an external light source.

[0062] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A non-contact engine bore wear measurement device, characterized by, include: A laser emitting unit (1), a pair of detection units (2) and a processing module (3); The laser emitting unit (1) is used to emit a laser beam composed of multiple laser beams in different directions to the engine cylinder liner (6); Two detection units (2) are positioned facing the laser beam to receive two results of the same laser beam illuminating the engine cylinder liner (6) from different positions; The signal output terminals of the detection unit (2) are connected to the signal output terminals of the processing module (3) to receive two types of transmission signals from different positions and output the cylinder shape results.

2. The non-contact engine bore wall wear measuring device of claim 1, wherein, The detection unit (2) is an industrial camera, which is symmetrically arranged on both sides of the laser emitting unit (1).

3. A non-contact engine bore wall wear measuring device as set forth in claim 2, wherein Multiple detection units (2) and laser emission units (1) are integrated on the same housing (7).

4. The non-contact engine bore wall wear measuring device of claim 2, wherein, The inner wall of the engine cylinder liner (6) is fitted with removable reflective markers (5).

5. A non-contact engine bore wall wear measuring device as set forth in claim 4, wherein The reflective marker (5) is connected to the engine cylinder liner (6) by adhesive bonding or magnetic adsorption.

6. A non-contact engine bore wall wear measuring device as set forth in claim 5, wherein The reflective markers (5) are asymmetrically and non-uniformly distributed on the inner wall surface of the engine cylinder liner (6).

7. A non-contact engine bore wall wear measuring device as set forth in claim 6 wherein, The density of the reflective markers (5) is such that during the scanning process, the detection unit (2) has at least four identifiable reflective markers (5) in its field of view at the same time.

8. The non-contact engine bore wall wear measurement device of claim 1, wherein, The laser beam emitted by the laser emitting unit (1) has a shape that includes one of the following patterns: dot matrix, linear array, or grid-like light spots.

9. The non-contact engine bore wall wear measuring device of claim 3, wherein, A supplementary light (4) is fixed on the side of the housing (7) near the detection unit (2).

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