Tool for detecting Leeb hardness of curved surface of workpiece

Abstract

The utility model provides a tool for detecting the Leeb hardness of a curved surface of a workpiece, and the tool comprises a supporting plate which is provided with a sliding assembly installation part for installing a sliding assembly; the sliding assembly is fixedly connected to the sliding assembly mounting part and is used for vertically sliding relative to the sliding assembly mounting part; the supporting column assembly is fixedly connected to the bottom of the supporting plate and is used for supporting a to-be-measured curved surface; and the correcting plate is fixedly connected to the bottom of the sliding assembly, the correcting plate is provided with a hardness tester mounting part used for mounting a Leeb hardness tester, and the bottom surface of the correcting plate is used for abutting against the curved surface to be measured under the driving of the sliding assembly. By optimizing the structure of the traditional Leeb hardness detection tool, the verticality between the hardness meter and the test surface of the measured workpiece is effectively ensured, so that the accuracy of a test result is ensured, and the detection precision and the detection efficiency of the Leeb hardness of the curved surface of the workpiece are improved.

Description

Technical Field

[0001] The present application relates to the technical field of hardness testing, and more specifically, to a tool for testing the Leeb hardness of a workpiece curved surface. Background Art

[0002] Hardness, as an important means of characterizing the performance of metal materials currently in service, has a wide range of applications in the fields of energy, electricity, chemical industry, etc.

[0003] Portable hardness testing methods provide great convenience for the detection of in-service metal material properties. The most typical ones are portable Brinell hardness tester and portable Leeb hardness tester. Among them, Leeb hardness tester is widely used in on-site inspection and testing due to its small size, easy operation and intuitive reading.

[0004] Taking thermal power plants as an example, there are many high-temperature metal materials that need to be tested for hardness, such as high-temperature fastening bolts, boiler heating surface tubes and the four major boiler pipes. They all have a common feature, that is, the testing working surfaces are all curved surfaces, while the end support ring of the Leeb hardness tester is a flat surface.

[0005] The principle of the Leeb hardness test method is that an impact body with a certain mass impacts the sample surface under a certain test force, and the impact velocity and rebound velocity of the impact body at 1mm from the sample surface are measured. Using the electromagnetic principle, a voltage proportional to the velocity is induced. The Leeb hardness value is expressed as the ratio of the impact body rebound velocity to the impact velocity. Therefore, this test method requires that when measuring curved workpieces, the probe must be perpendicular to the workpiece surface. Therefore, when using a portable Leeb hardness tester to test curved workpieces, due to the influence of factors such as human operation and inspection and detection position, the verticality between it and the workpiece detection surface has a great influence on the accuracy of the hardness test results.

[0006] In view of this, how to design a workpiece curved surface Leeb hardness testing fixture that can ensure the verticality between the Leeb hardness tester and the testing working surface of the tested workpiece is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0007] The present application provides a workpiece curved surface Leeb hardness testing tool, which can effectively ensure the verticality between the hardness tester and the test surface of the workpiece to be tested, thereby ensuring the accuracy of the test results and improving the detection accuracy of the workpiece curved surface Leeb hardness.

[0008] The present application provides a workpiece curved surface Leeb hardness testing tool, comprising:

[0009] The support plate is provided with a sliding assembly mounting portion for mounting the sliding assembly;

[0010] A sliding assembly, fixedly connected to the sliding assembly mounting portion and configured to slide vertically relative to the sliding assembly mounting portion;

[0011] A support column assembly, fixedly connected to the bottom of the support plate and used to support the curved surface to be measured;

[0012] The positive plate is fixedly connected to the bottom of the sliding assembly. The positive plate is provided with a hardness tester mounting portion for mounting a Leeb hardness tester. The bottom surface of the positive plate is pressed against the curved surface to be measured under the drive of the sliding assembly.

[0013] In some embodiments, the sliding assembly comprises:

[0014] Four sliding blocks, fixedly connected to the sliding assembly mounting portion and circumferentially distributed on the sliding assembly mounting portion;

[0015] Four sliding rods vertically pass through the slider and are used to slide vertically relative to the slider to drive the alignment plate to press against the curved surface to be measured;

[0016] Four limiting members are arranged at the connection part between the sliding block and the sliding rod, and are used for controlling the vertical sliding position of the sliding rod.

[0017] In some embodiments, the support column assembly includes: four support columns and four spheres, the top of the support column is provided with a first stud threadedly connected to the connecting hole of the support plate, the bottom of the support column is provided with a support column threaded hole, the sphere includes a sphere and a second stud, and the second stud is threadedly connected to the support column threaded hole.

[0018] In some embodiments, the hardness tester mounting portion includes a circular through hole penetrating the thickness of the positive plate and an annular boss arranged on the upper side of the circular through hole.

[0019] In some embodiments, chamfers are provided at the four corners of the aligning plate.

[0020] In some embodiments, the circular through hole is disposed at the center of the aligning plate.

[0021] In some embodiments, the inner edge of the annular boss is chamfered.

[0022] The workpiece curved surface Leeb hardness testing tool provided in this application has the following technical advantages:

[0023] 1. This application can ensure the verticality between the Leeb hardness tester and the detection surface of the workpiece to be tested. At the same time, the up and down movement of the positive plate can be realized through the sliding component, so that the hardness of workpieces with curved surfaces such as columns and tubes of different diameters can be tested. The test efficiency is high and the practicability is strong.

[0024] 2. The components of the present application are fastened together by bolts, which not only realizes a fastened rigid connection, but is also easy to assemble and disassemble, easy to carry, and can be quickly assembled and disassembled at the inspection site, making it convenient to replace components on site and to quickly replace components when they are damaged, thus avoiding the entire tooling being unusable due to damage to a certain component and saving maintenance costs.

[0025] 3. The detection tooling has a simple structure, high reliability, accurate and efficient detection, and improves the detection accuracy of the Leeb hardness of cylindrical workpieces on site.

[0026] 4. This application is applicable to Leeb hardness testers with support rings of different diameters and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of the Leeb hardness testing tool for workpiece curved surface provided in this application;

[0029] Figure 2 A schematic diagram of the three-dimensional structure of another angle of the workpiece curved surface Leeb hardness testing tool provided in this application;

[0030] Figure 3 for Figure 1 The main view;

[0031] Figure 4 for Figure 1 A top view of the middle support plate;

[0032] Figure 5 for Figure 3 Cross-sectional view of the middle AA part;

[0033] Figure 6 for Figure 1 A front view of the middle support plate;

[0034] Figure 7 A schematic diagram of the three-dimensional structure of the sliding assembly provided in this application;

[0035] Figure 8 for Figure 7 The main view;

[0036] Fig. 9 for Figure 7 Side view of

[0037] Fig.10 The front view of the plate provided for this application;

[0038] Fig.11 A top view of the positive plate provided for this application;

[0039] Fig.12 A schematic diagram of the support column provided for this application;

[0040] Fig.13 A schematic diagram of a sphere provided for this application;

[0041] Among them, 1-support plate, 2-sliding assembly, 3-support column assembly, 4-positive plate;

[0042] 11-sliding assembly mounting portion, 21-sliding block, 22-sliding rod, 31-support column, 32-spherical body, 41-hardness tester mounting portion, 42-step hole;

[0043] 221 - threaded hole of sliding rod, 311 - screw rod, 312 - threaded hole of supporting column, 321 - sphere, 322 - second stud. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] refer to Figure 1 , Figure 2 and Figure 3 The present application provides a workpiece curved surface Leeb hardness testing tool, which mainly includes: a support plate 1, a sliding assembly 2, a support column assembly 3 and a positive plate 4.

[0046] The support plate 1 is provided with a sliding assembly mounting portion 11 (such as Figure 4 As shown in FIG. 1 , the sliding assembly 2 is fixedly connected to the sliding assembly mounting portion 11, and the sliding assembly 2 can slide vertically relative to the sliding assembly mounting portion 11 under the action of external force. The support column assembly 3 is fixedly connected to the bottom of the support plate 1 to support the curved surface to be measured.

[0047] Specifically, the sliding assembly mounting portion 11 is a square stepped hole arranged at the center of the support plate 1, and two threaded holes (such as Figure 5 and Figure 6 As shown), the sliding component 2 is fastened and installed in the threaded hole by means of locking members such as bolts, so that the sliding component 2 is fixedly installed in the square step hole of the support plate 1.

[0048] like Figure 4 , Figure 5 and Figure 6 As shown. The positive plate 4 is a steel flat plate, and the material is preferably alloy steel or stainless steel, which has good strength and rigidity and is not prone to elastic and plastic deformation. The positive plate 4 is fixedly connected to the bottom of the sliding assembly 2, and the positive plate 4 can be pressed against the curved surface to be measured under the drive of the sliding assembly 2. In addition, the positive plate 4 is provided with a hardness tester mounting portion 41, and the Leeb hardness tester is mounted on the hardness tester mounting portion 41.

[0049] When in use, the detection tool is placed on the outer arc surface of the workpiece to be inspected, the support column assembly 3 is in contact with the curved surface of the workpiece without shaking, the height of the sliding assembly 2 is adjusted so that the lower surface of the positive plate 4 is in contact with the circular arc surface of the cylindrical workpiece, and the portable Leeb hardness tester is placed on the hardness tester mounting portion 41, the end of the hardness tester contact ring is in contact with the detection working surface, and under the action of the positive plate 4, it remains perpendicular to the detection working surface. After that, the inspection can be carried out according to the inspection steps. The workpiece curved surface Leeb hardness detection tool provided in the present application has the advantages of simple structure, easy installation, high reliability, and low comprehensive cost. It can be quickly disassembled and assembled at the construction site, which greatly improves the accuracy and detection precision of the Leeb hardness test results of the cylindrical workpiece curved surface.

[0050] refer to Figure 7 , Figure 8 and Fig. 9 . In a specific embodiment, the sliding assembly 2 includes: four sliders 21, four slide rods 22 and four limiters. The four sliders 21 are fixedly connected to the sliding assembly mounting portion 11 and are circumferentially distributed in the sliding assembly mounting portion 11. The four side walls in the square sliding assembly mounting portion 11 of the support plate 1 are each provided with two threaded holes. One side of the slider 21 is a plane, and two through holes are provided thereon, which can be matched with the threaded holes on the step hole of the support plate 1 and are fastened by bolts. The slide rod 22 vertically passes through the slider 21, and the limiter is arranged at the connection part between the slider 21 and the slide rod 22. The vertical sliding position of the slide rod 22 is controlled by the limiter. The slide rod 22 slides vertically relative to the slider 21, thereby driving the positive plate 4 to press against the curved surface to be measured. It should be noted that the limiter in this application is a standard part. For the specific structure and working principle of the limiter, please refer to the prior art, which will not be expanded in this article.

[0051] The hardness tester mounting portion 41 is specifically a circular through hole provided on the positive plate 4, and the circular through hole is preferably, but not limited to, provided at the center of the positive plate 4. A clearance fit is adopted between the front end cylinder of the hardness tester and the circular through hole, and the diameter of the circular through hole is +0.01 to 0.02 mm of the nominal diameter of the front end cylinder of the hardness tester. An annular boss is provided on one side of the circular through hole. In order to facilitate the insertion of the front end cylinder of the hardness tester into the circular through hole, a chamfer is provided on the inner side of the annular boss 42, and at the same time, it can ensure that the circular through hole and the front end cylinder of the hardness tester cooperate smoothly without large shaking.

[0052] The bottom of the slide bar 22 is connected to the positive plate 4 by fastening bolts. Specifically, four step holes 42 (such as Fig.10 and Fig.11 As shown), the step hole 42 on the positive plate 4 matches with the slide rod threaded hole 221 on the slide rod 22, and the positive plate 4 is installed on the slide rod 22 by tightening bolts, so that the positive plate 4 is rigidly connected to the slide rod 22.

[0053] It should be noted that there are various ways to connect the positive plate 4 and the sliding rod 22, for example, threaded connection or welding.

[0054] refer to Fig.12 and Fig.13 . In a specific embodiment, the support column assembly 3 includes: four support columns 31 and four spherical bodies 32, the top of the support column 31 is provided with a screw 311 threadedly connected to the connection hole of the support plate 1, the bottom of the support column 31 is provided with a support column threaded hole 312, the spherical body 32 includes a sphere 321 and a second stud 322, and the second stud 322 is threadedly connected to the support column threaded hole 312. The provision of the spherical body 32 can make the tooling better suitable for Leeb hardness testing of workpiece curved surfaces of different diameters, thereby increasing the scope of application of the tooling. The spherical body 32 and the support column 31 adopt a split installation structure, and spherical bodies 32 of different diameters can be selected as needed, and the spherical body 32 or the support column 31 is easy to replace.

[0055] It is understandable that in order to improve the accuracy of the tooling, the four support columns 31 are preferably obtained by high-precision machining to ensure that the stud sections, cylindrical sections, concentricity, length and other dimensions of the four support columns 31 are exactly the same.

[0056] In the above embodiments, in order to reduce the probability of collision between the retrieval plate 4 and surrounding objects or operators during the lifting and lowering movement, chamfers can be set at the four corners of the retrieval plate 4. The chamfer structure can be a right angle or a rounded angle. At the same time, the chamfer setting can reduce the weight of the retrieval plate 4, making the movement of the retrieval plate 4 easier.

[0057] The workpiece curved surface Leeb hardness testing tool provided in the present application, the support column assembly 3, the positive plate 4 and the sliding assembly 2 cooperate to ensure the verticality of the Leeb hardness tester detection position. The Leeb hardness tester can be used to achieve efficient and high-precision testing of the Leeb hardness of tubular, cylindrical and other curved workpieces.

[0058] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0059] The above is a detailed introduction to the Leeb hardness testing tool for workpiece curved surfaces provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A workpiece curved surface Leeb hardness testing tool, characterized in that: include: The support plate (1) is provided with a sliding component mounting portion (11) for mounting the sliding component (2); A sliding assembly (2) fixedly connected to the sliding assembly mounting portion (11) and configured to slide vertically relative to the sliding assembly mounting portion (11); A support column assembly (3) is fixedly connected to the bottom of the support plate (1) and is used to support the curved surface to be measured; A positive plate (4) is fixedly connected to the bottom of the sliding assembly (2); the positive plate (4) is provided with a hardness tester mounting portion (41) for mounting a Leeb hardness tester; and the bottom surface of the positive plate (4) is pressed against the curved surface to be measured under the drive of the sliding assembly (2).

2. The workpiece curved surface Leeb hardness testing tool according to claim 1, characterized in that: The sliding assembly (2) comprises: Four sliding blocks (21) are fixedly connected to the sliding component mounting portion (11) and are circumferentially distributed on the sliding component mounting portion (11); Four slide bars (22) vertically pass through the slider (21) and are used to slide vertically relative to the slider (21) to drive the alignment plate (4) to press against the curved surface to be measured; Four limiting members are arranged at the connection portion between the sliding block (21) and the sliding rod (22) and are used to control the vertical sliding position of the sliding rod (22).

3. The workpiece curved surface Leeb hardness testing tool according to claim 1, characterized in that: The support column assembly (3) comprises: four support columns (31) and four spherical bodies (32); the top of the support column (31) is provided with a spherical body (32) threadedly connected to a connection hole of the support plate (1); the bottom of the support column (31) is provided with a support column threaded hole (312); the spherical body (32) comprises a sphere (321) and a second stud (322); the second stud (322) is threadedly connected to the support column threaded hole (312).

4. The workpiece curved surface Leeb hardness testing tool according to any one of claims 1 to 3, characterized in that: The hardness tester mounting portion (41) comprises a circular through hole penetrating the thickness of the positive plate (4) and an annular boss arranged on the upper side of the circular through hole.

5. The workpiece curved surface Leeb hardness testing tool according to claim 4, characterized in that: The four corners of the positive plate (4) are provided with chamfers.

6. The workpiece curved surface Leeb hardness testing tool according to claim 4, characterized in that: The circular through hole is arranged at the center position of the positive plate (4).

7. The workpiece curved surface Leeb hardness testing tool according to claim 4, characterized in that: The inner edge of the annular boss is chamfered.

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