Profiling eddy current testing device for key part of locomotive plunger

Abstract

The utility model relates to the technical field of nondestructive testing, and discloses a profiling eddy current testing device for a key part of a locomotive plunger, which is used for synchronously detecting the piston surface of an internal combustion engine plunger and the key joint of a ball head connecting rod, and the piston is movably connected with the ball head connecting rod. The device comprises a slide rail type auxiliary rotator sleeved outside a piston and a profiling array eddy current detection probe arranged on a slide rail. Wherein the profiling array eddy current detection probe is provided with a profiling framework conformal to the outer surface of a workpiece, a connecting rod fixer and a detection end corresponding to a to-be-detected part, and during detection, the two movably connected workpieces are relatively fixed through the connecting rod fixer; and simultaneous rapid detection of multiple parts is realized through relative rotation of the profiling array eddy current detection probe and the workpiece to be detected. According to the utility model, pollution-free, rapid and effective detection of fatigue cracks on the surfaces of a plurality of parts on parts movably connected with the plunger is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to nondestructive testing technical field especially relates to a profiled eddy current detection device of locomotive plunger key position. BACKGROUND

[0002] Railway transportation has become one of the indispensable important traffic tools in the modern logistics system with its large capacity, low cost, high stability and other advantages. As the core power source of railway transportation, the reliability of its numerous components is directly related to the safety and stability of the entire transportation process. Among them, the connecting rod, piston and other components of the plunger are in a key position. They bear complex stress during the operation of the locomotive, including alternating load, high temperature, high pressure, etc. After long-term operation, potential defects such as fatigue cracks are prone to occur. Once these components fail, not only will the locomotive power performance decline, but also may cause serious safety accidents, affecting the normal order of railway transportation. In order to ensure the reliability of the locomotive power components during work, according to the specified maintenance period, these key components need to be detected to check potential defects. The plunger cannot be magnetized, and the magnetic powder detection method is excluded. One of the commonly used detection methods in the past is the penetration detection method. However, the penetration detection method has significant drawbacks. On the one hand, the penetration detection operation process is relatively complicated, and it takes a lot of time to perform penetration, cleaning, imaging and other steps, resulting in low detection efficiency, which is difficult to meet the needs of large-scale and efficient maintenance and repair of railway locomotives. On the other hand, and most importantly, the penetration liquid, developing agent and other chemicals used in the penetration detection process often contain components harmful to the environment, which can pollute the soil, water and other natural environments if not properly disposed of after use, which does not meet the increasingly strict environmental protection requirements.

[0003] With the increasing emphasis on environmental protection, it is urgent to find a replacement non-destructive testing method.

[0004] Looking at the current non-destructive testing methods, the non-array eddy current method is the best choice to replace the penetration method for quickly and sensitively detecting fatigue cracks after operation. The utility model device is based on this background and is born in response to this, aiming to use the array eddy current method to better complete the non-destructive detection of the key parts of the connecting rod weld, piston outer surface and other key parts of the railway locomotive plunger. However, the combustion chamber shape at the top of the piston is complex, which is a free-form surface. If a traditional point eddy current probe is used for detection, the operation is difficult, the detection efficiency is low, and the precision measurement accuracy is insufficient. Based on this, the utility model proposes a profiled eddy current detection device for key parts of a locomotive plunger to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a kind of key part of locomotive plunger profiling eddy current detection device, the utility model is realized as follows:

[0006] A kind of key part of locomotive plunger profiling eddy current detection device, for the synchronous detection of internal combustion engine piston surface and ball head connecting rod key connection, wherein ball head connecting rod is movably arranged in piston, profiling eddy current detection device includes auxiliary rotator and profiling array eddy current detection probe;

[0007] The auxiliary rotator is a slide rail sleeved on the outer surface of the piston, and the profiling array eddy current detection probe is arranged on the slide rail.

[0008] The profiling array eddy current detection probe includes a profiling shell, a profiling skeleton, a connecting rod fixer, a first detection end and a second detection end encapsulated in the profiling shell.

[0009] The profiling skeleton is fully conformal to the outer surface of the ball head connecting rod and the piston, the first detection end is arranged at a position corresponding to the key connection of the connecting rod in the profiling skeleton, and the second detection end is arranged at a position corresponding to the outer surface of the piston in the profiling skeleton.

[0010] The connecting rod fixer is arranged at the upper end of the profiling skeleton, and is adapted to be clamped at the upper end of the connecting rod, so that the connecting rod and the piston maintain a fixed relative position.

[0011] During detection, the profiling array eddy current detection probe is pressed onto the surface of the piston and the ball head connecting rod, and the profiling array eddy current detection probe is rotated relative to the piston and the ball head connecting rod to detect the surface fatigue cracks of the workpiece.

[0012] Further, the connecting rod fixer is a semicircular groove fully conformal to the top of the ball head connecting rod.

[0013] Further, the first detection end and the second detection end are respectively provided with array eddy current detection coils.

[0014] Further, the slide rail is fixedly clamped on the outer surface of the piston, and the profiling array eddy current detection probe is slidably arranged on the slide rail.

[0015] The bottom of the profiling shell is provided with a sliding block or a pulley adapted to the slide rail.

[0016] Alternatively, the slide rail can rotate along the circumference of the piston, and the profiling array eddy current detection probe is fixedly arranged on the slide rail.

[0017] The part of the slide rail and the piston surface is provided with a sliding wheel.

[0018] Further, the surface of the sliding wheel is attached with an anti-abrasion protective layer.

[0019] Compared with the prior art, the application can obtain the following technical effects:

[0020] The utility model discloses a profiling array eddy current detection method, realizes the pollutionless, fast effective part surface fatigue crack detection, and specifically includes: the relative fixation of two movable workpieces is realized through the cooperation of profiling skeleton and connecting rod fixer, guarantees the stability of detection, and under the relatively fixed form, the synchronous detection of piston and ball head connecting rod key parts of the movable connection of internal combustion engine plunger is realized through profiling probe, the profiling structure ensures that array eddy current detection coil can be closely attached to the detected part, and the vortex signal change caused by various defects can be effectively captured, and the accuracy and comprehensiveness of detection are improved, auxiliary rotating tool is adopted, and on the basis of manual detection, semi-automatic or full-automatic rotary detection is realized, compared with the traditional one by one position, multiple detection mode, the detection time and workload are reduced significantly, and the flexibility and adaptability of detection are increased. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the utility model example or the technical scheme in prior art or the drawings needed to be used in the prior art description, obviously, for ordinary skilled in the art, without paying creative labor, other drawings can also be obtained according to these drawings.

[0022] Figure 1 It is the structural schematic diagram of piston and spherical connecting rod to be detected.

[0023] Figure 2 It is the structural schematic diagram of profiling array eddy current detection probe.

[0024] Figure 3 It is Figure 2 The schematic diagram in another perspective.

[0025] Figure 4 It is the brief structural schematic diagram of auxiliary rotator.

[0026] In the drawing:

[0027] 10-piston, 11-piston surface;

[0028] 20-ball head connecting rod, 21-key connection;

[0029] 30-profiling array eddy current detection probe, 31-profiling skeleton, 32-connecting rod fixer, 33-first detection end, 34-second detection end, 35-array eddy current detection coil;

[0030] 40-auxiliary rotator. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0032] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0033] The following describes a contour eddy current testing device for a key component of a locomotive plunger, based on the embodiments shown in the accompanying drawings. The contour eddy current testing device of this embodiment is used for the synchronous testing of the piston surface 11 and the key connection 21 of the ball joint connecting rod 20 in an internal combustion engine. In other embodiments, a corresponding contour structure can also be designed and applied to the synchronous non-destructive testing of the surface or key components of other similar components that are movably connected by two similar metal parts.

[0034] Reference Appendix Figure 1 In this embodiment, the ball joint 20 is movably disposed inside the piston 10, with its ball head extending outside the piston 10. The piston 10 is cylindrical. The designed contour eddy current detection device includes an auxiliary rotator and a contour array eddy current detection probe 30.

[0035] Reference Appendix Figure 4 The auxiliary rotator 40 is an annular slide rail sleeved on the outer surface of the piston 10. In this embodiment, the annular slide rail is composed of two symmetrical semicircular structures joined together. One end of the two semicircular structures is connected by a hinge, and the other end is provided with a buckle for fixing. In other embodiments, other fastening methods can also be used, such as snap-fit ​​connection.

[0036] The contour array eddy current detection probe 30 is mounted on the slide rail, and its several detection surfaces are respectively attached to the part to be measured;

[0037] The contoured array eddy current detection probe 30 includes a contoured housing and a contoured skeleton 31, a connecting rod retainer 32, a first detection end 33, and a second detection end 34 encapsulated within the contoured housing.

[0038] The conformal skeleton 31 is perfectly conformal to the outer surfaces of the ball joint connecting rod 20 and the piston 10. (See attached figure) Figure 2 The first detection end 33 is located at the critical connection 21 of the ball joint connecting rod on the contoured skeleton 31, that is, at the connection between the ball joint and the connecting rod. The second detection end 34 is located at the location of the contoured skeleton 31 corresponding to the outer surface of the piston 10. In this embodiment, the size of the contoured skeleton is enlarged for easier understanding of the structure. In other embodiments or in actual working conditions, the size of the contoured skeleton can be designed according to the specific detection situation.

[0039] The connecting rod retainer 32 is disposed at the upper end of the contour frame 31. The connecting rod retainer 32 is adapted to clamp the upper end of the ball joint connecting rod, so that the ball joint connecting rod and the piston are fixed in relative position.

[0040] Reference Appendix Figures 2-3 In this embodiment, the connecting rod retainer 32 is a semi-circular groove that is perfectly conformable to the top of the ball joint connecting rod 20. An elastic pad can be provided on the inner wall of the semi-circular groove to protect the ball joint connecting rod 20. When the semi-circular groove is placed over the top of the ball joint connecting rod 20 and slightly pressed down, the ball joint connecting rod 20 and the piston 10 are relatively fixed, so that the ball joint connecting rod 20 does not deviate or rotate, which facilitates the synchronous detection of the test parts on the two movable connected components.

[0041] During testing, the contoured array eddy current testing probe 30 is pressed against the surfaces of the piston 10 and the ball joint connecting rod 20. The probe 30 is rotated one revolution relative to the piston 10 and the ball joint connecting rod 20 to detect fatigue cracks on the workpiece surface. Testing can be performed manually or by motor-driven rotation.

[0042] Furthermore, arrayed eddy current detection coils 35 are respectively provided on the first detection end 33 and the second detection end 34. In this embodiment, the arrayed eddy current detection coil 35 is a flexible planar spiral coil embedded on the contoured skeleton, or a planar spiral coil is plated on the corresponding position of the contoured skeleton using metal coating technology. The detection efficiency is improved by arrayed eddy current detection, and array scanning is performed quickly.

[0043] Furthermore, the slide rail is fixedly clamped to the outer surface of the piston, and the contour array eddy current detection probe is slidably disposed on the slide rail. During detection, the contour array eddy current detection probe slides along the slide rail to achieve rapid detection of the entire circle.

[0044] The bottom of the contoured housing is equipped with a slider or pulley that matches the slide rail, improving the smoothness of rotation detection.

[0045] Alternatively, in another embodiment, the slide rail can rotate around the piston in the circumference, and the contour array eddy current detection probe is fixedly mounted on the slide rail;

[0046] The slide rail is equipped with a sliding wheel at the part that contacts the piston surface. The sliding wheel assists the slide rail to rotate on the piston surface. When the slide rail rotates, the contour array eddy current detection probe, which is integrally fixed on the slide rail, detects the part to be tested.

[0047] Furthermore, the surface of the sliding wheel is covered with an anti-wear protective layer, which prevents the sliding wheel from causing secondary wear on the piston surface.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A profiled eddy current testing device for key locations of locomotive pistons, for simultaneous testing of the piston surface and the key joint of the ball and socket connecting rod in internal combustion engines, wherein, The ball head connecting rod is movably arranged in the piston, and the profiling eddy current detection device comprises an auxiliary rotator and a profiling array eddy current detection probe; The auxiliary rotator is a slide rail sleeved on the outer surface of the piston, and the profiling array eddy current detection probe is arranged on the slide rail; The profiling array eddy current detection probe comprises a profiling shell, a connecting rod fixator, a first detection end and a second detection end which are packaged in the profiling shell; The profiling skeleton is fully conformed to the outer surface of the piston and the ball head connecting rod, the first detection end is arranged at a position corresponding to the key connecting position of the connecting rod, and the second detection end is arranged at a position corresponding to the outer surface of the piston; The connecting rod fixator is arranged at the upper end of the profiling skeleton, and the connecting rod fixator is arranged on the upper end of the connecting rod, so that the connecting rod and the piston are fixed in relative position. During detection, the profiling array eddy current detection probe is arranged on the surface of the piston and the ball head connecting rod, and the profiling array eddy current detection probe is rotated relative to the piston and the ball head connecting rod to detect the surface fatigue crack of the workpiece.

2. A device for eddy current inspection of a profile of a critical area of a locomotive plunger as defined in claim 1, wherein, The connecting rod fixator is a semicircular groove fully conformed to the top of the ball head connecting rod.

3. A device for eddy current inspection of a profile of a critical area of a locomotive plunger as defined in claim 2, wherein, The first detection end and the second detection end are respectively provided with array eddy current detection coils.

4. The apparatus of claim 3 wherein, The slide rail is fixed and clamped on the outer surface of the piston, and the profiling array eddy current detection probe is slidably arranged on the slide rail. The bottom of the profiling shell is provided with a sliding block or a pulley matched with the slide rail.

5. The apparatus of claim 3 wherein, The slide rail can rotate along the circumference of the piston, and the profiling array eddy current detection probe is fixedly arranged on the slide rail. The part of the slide rail matched with the surface of the piston is provided with a sliding wheel.

6. A non-destructive eddy current testing apparatus for profiling a critical area of a locomotive piston as defined in claim 5, wherein, The surface of the sliding wheel is provided with an anti-abrasion protective layer.

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