CN215004794U - Uniform-speed rebound hardness tester impact device based on eddy current testing technology - Google Patents
Uniform-speed rebound hardness tester impact device based on eddy current testing technology Download PDFInfo
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- CN215004794U CN215004794U CN202120615425.9U CN202120615425U CN215004794U CN 215004794 U CN215004794 U CN 215004794U CN 202120615425 U CN202120615425 U CN 202120615425U CN 215004794 U CN215004794 U CN 215004794U
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Abstract
The utility model discloses a uniform velocity rebound hardness tester impact device based on eddy current testing technology, which comprises an eddy current signal analyzer and an impact assembly, wherein the impact assembly comprises a loading sleeve, the upper part of the loading sleeve is connected with a release button, the bottom of the loading sleeve is connected with a conduit, and the bottom of the conduit is connected with an eddy current coil assembly; a spring mechanism is arranged in the loading sleeve, and an impact body is connected to the spring mechanism. The eddy current coil assembly comprises an eddy current coil body, a distance coil and a reference coil are arranged on the upper portion of the eddy current coil body, the distance coil is located on the upper portion of the reference coil, and a distance is reserved between the distance coil and the reference coil. The impact body is provided with an artificial notch, and the impact body can penetrate through the distance coil and the reference coil on the eddy current coil body. When the device is used for hardness testing, the influence of gravity, air resistance, friction force and the like on a measuring result can be reduced, the real hardness of a material can be more accurately reflected, inherent errors are reduced, and the accuracy of hardness detection is greatly improved.
Description
Technical Field
The utility model relates to a hardness measurement field, concretely relates to uniform velocity resilience sclerometer impact device based on eddy current testing technique.
Background
The hardness is an important performance index for measuring the hardness degree of the material, and is a comprehensive performance index of mechanical properties such as elasticity, plasticity, strength, toughness and the like of the material. The hardness test can be classified into a static pressure method (e.g., Brinell hardness, Rockwell hardness, Vickers hardness, etc.), a scratch method (e.g., Mohs hardness), and a rebound method (e.g., Shore hardness, Rich hardness) depending on the test method. The hardness of the alloy is simple, convenient and rapid to test, and mature in instruments, equipment and methods, so that the alloy is widely applied to hardness supervision and inspection of on-site metal materials.
The existing method for testing the hardness of the same impact body; the greater the material hardness, the greater the rebound velocity. The scientific definition of the hardness in richter is: the hardness of the material in the form of the ratio of the rebound Velocity (VR) of the impact body at 1mm from the surface of the test piece to the impact Velocity (VA) is expressed by the fact that the impact body with a given mass vertically impacts the surface of the test piece under the action of spring force at a certain speed.
The calculation formula is as follows:
HL＝1000·VR/VA
in the formula:
HL-Richter hardness number, HL
VR-rebound velocity, m/s
VA-impact velocity, m/s
The principle of the instrument is that an impact body with certain mass impacts the surface of a sample under certain test force action, and the impact speed and the rebound speed of the impact body at a position 1mm away from the surface of the sample are measured. The speed measurement is realized by measuring and inducing a voltage which is in direct proportion to the speed by utilizing the principle of electromagnetic induction.
From the above, the impact velocity is the initial amount of the applied force, the rebound velocity is directly related to the hardness degree of the material, and the accuracy of the impact velocity and rebound velocity tests determines the accuracy of the detection system. The existing method of the hardness test of the Richter scale measures the instantaneous velocity at 1mm from the surface of the test piece, regardless of the impact velocity and the rebound velocity. The impact device of the richter hardness tester is influenced by external factors such as air resistance, component friction force, self gravity and the like in the process of impacting the surface of a test sample and rebounding. The rebound speed is highest on the surface of the sample, and is gradually reduced in the rebound process; the impact velocity is highest when leaving the impact device and lowest when reaching the sample surface.
VR is the rebound velocity of the impact body at 1mm from the sample surface, and VA is the impact velocity of the impact body at 1mm from the sample surface. Setting VR0Instantaneous rebound velocity, VA, just before the impact body leaves the sample surface0The instantaneous impact velocity of the impact body just as it reaches the sample surface. Known, VR is0>VR，VA0<VA. On the surface of a sample, the influence of external factors such as air resistance, component friction force, self gravity and the like on a test system is minimum, and the test system is based on VR0、VA0The established hardness corresponding relation of the material has the highest accuracy. However, due to the current technical conditions, it is difficult or uneconomical to obtain the instantaneous impact velocity and instantaneous rebound velocity of the impact body on the surface of the sample. The corresponding average velocity can be obtained by prior art means measuring the time for the impact body to pass 1mm over the surface of the test piece. Setting:
VRA is the average rebound velocity of the impact body within 1mm of the sample surface, VR0>VRA>VR。
VAA is the average rebound velocity of the impact body within 1mm of the surface of the test piece, VA>VAA>VA0。
The average velocity obtained is closer to the instantaneous velocity at the sample surface than to the instantaneous velocity at 1mm from the sample surface.
If VRA is used for replacing VR, VAA is used for replacing VA, and the characteristic relation between the average speed of the impact body in 1mm of the surface of the sample and the hardness of the material is established, the real hardness of the material can be reflected better, the inherent error is reduced, and the accuracy of the detection system is improved greatly.
SUMMERY OF THE UTILITY MODEL
To the problem that current richter hardness testing exists, the utility model provides an equal fast resilience sclerometer impact device based on eddy current testing technique.
The utility model adopts the following technical proposal:
an impact device of a uniform-velocity rebound hardness tester based on an eddy current detection technology comprises an eddy current signal analyzer and an impact assembly, wherein the eddy current signal analyzer is electrically connected with the impact assembly, the impact assembly comprises a loading sleeve, the upper part of the loading sleeve is connected with a release button, the bottom of the loading sleeve is connected with a guide pipe, and the bottom of the guide pipe is connected with an eddy current coil assembly;
a spring mechanism is arranged in the loading sleeve, and an impact body is connected to the spring mechanism;
the eddy current coil assembly comprises an eddy current coil body, a distance coil and a reference coil are arranged on the upper portion of the eddy current coil body, the distance coil is located on the upper portion of the reference coil, and a distance is reserved between the distance coil and the reference coil;
the impact body is provided with an artificial notch, the impact body can penetrate through the distance coil and the reference coil on the eddy current coil body, and the artificial notch on the impact body can generate eddy current signals with the distance coil and the reference coil.
Preferably, the release button is pressed, the spring mechanism powers the impact body, which disengages the spring mechanism and falls within the conduit, and the impact body can pass through the distance coil and the reference coil on the eddy current coil body in sequence.
Preferably, the top of the impact body is provided with a safety chuck, the safety chuck is connected with the spring mechanism, and the safety chuck can be separated from the spring mechanism by pressing the release button.
Preferably, the bottom of the impact body is provided with an impact ball head.
Preferably, the impact bulb is made of a tungsten carbide material.
Preferably, the impact body is made of a nonmagnetic material.
Preferably, the artificial score is provided at an outer upper wall of the impact body.
Preferably, the eddy current signal can be fed into an eddy current signal analyzer.
Preferably, the eddy current coil body is provided with a signal line interface, the eddy current signal analyzer is provided with an instrument interface, and the signal line interface is connected with the instrument interface through a signal line.
Preferably, a support ring is connected to the bottom of the eddy current coil assembly.
The utility model has the advantages that:
the utility model provides a uniform velocity resilience sclerometer impact device based on eddy current testing technique can adapt to the quick hardness detection in scene of material. The device establishes a characteristic relation between the average speed of the impact body and the hardness of the material based on the average speed of the impact body within a specific distance range on the surface of the test sample. When the device is used for hardness testing, the influence of gravity, air resistance, friction force and the like on a measuring result can be reduced, the real hardness of a material can be more accurately reflected, inherent errors are reduced, and the accuracy of hardness detection is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of the detection of a uniform velocity rebound hardness tester impact device based on eddy current detection technology.
Figure 2 is a schematic diagram of an eddy current coil assembly.
Fig. 3 is a schematic view of an impact body.
1. A release button; 2. loading a sleeve; 3. a conduit; 4. an eddy current coil body; 4-1, distance coil 1; 4-2, a reference coil; 4-3, signal line interface; 5. an impact body; 5-1, manually grooving; 5-2 impacting the ball head; 6. a support ring; 7. a signal line; 8. an eddy current signal analyzer; 8-1 instrument interface; 9. and (5) detecting the material.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
With reference to fig. 1 to 3, an impact device of a uniform velocity rebound hardness tester based on an eddy current testing technology includes an eddy current signal analyzer 8 and an impact assembly, where the eddy current signal analyzer 8 is electrically connected with the impact assembly.
The impact assembly comprises a loading sleeve 2, the upper part of the loading sleeve is connected with a release button 1, the bottom of the loading sleeve is connected with a guide pipe 3, and the bottom of the guide pipe is connected with an eddy current coil assembly.
The bottom of the eddy current coil assembly is connected with a support ring 6.
A spring mechanism is arranged in the loading sleeve 2, and an impact body 5 is connected to the spring mechanism.
The impact body 5 is drawn outside the impact assembly in fig. 1 for better illustration, in fact the impact body 5 is located inside the impact assembly.
By pressing the release button, the spring mechanism can provide power to the impact body, which disengages the spring mechanism.
The conduit plays the role of isolation and protection for the impact body.
The bottom of the support ring 6 is provided with a rubber coating, the support ring can be in contact with a detected material, the displacement of the impact assembly in the test process is prevented, and the support ring can provide protection for a falling impact body.
The eddy current coil assembly comprises an eddy current coil body 4, a distance coil 4-1 and a reference coil 4-2 are arranged on the upper portion of the eddy current coil body, the distance coil 4-1 is located on the upper portion of the reference coil 4-2, and a distance is reserved between the distance coil 4-1 and the reference coil 4-2.
In this embodiment, the spacing L between the distance coil 4-1 and the reference coil 4-2 is 1 mm.
The function of the reference coil is zero calibration 4-2, and the function of the distance coil 4-1 is distance.
The eddy current inspection is a nondestructive inspection method for evaluating a workpiece to be inspected by using an electromagnetic effect of eddy currents induced in a conductive material by an alternating magnetic field. The principle is that when a detection coil carrying alternating current is close to an object, if the object is a conductive substance, eddy current is induced in the conductive substance under the action of an alternating magnetic field generated by the detection coil. The opposing magnetic field of the induced eddy currents in turn causes the impedance of the detection coil to change. By measuring the change in impedance of the detection coil, the conductivity performance of the test object can be determined. The eddy current detection system generally comprises an eddy current detector and a detection coil. The eddy current detection is non-contact detection, and the movement speed of the detected object is not influenced; the output signal is an electric signal, and acquisition and processing are convenient. The eddy current detection technology is utilized to measure the average rebound speed and the average impact speed of the impact body in a specific position distance range.
The top of impact body 5 is provided with safety chuck, and safety chuck is connected with spring mechanism, presses release button, and safety chuck can break away from with spring mechanism.
The impact body 5 is provided with an artificial notch 5-1 which is arranged on the outer upper wall of the impact body.
The impact body can penetrate through the distance coil 4-1 and the reference coil 4-2 on the eddy current coil body in the falling process, and the manual notch on the impact body can generate eddy current signals with the distance coil and the reference coil.
The eddy current coil body is provided with a signal line interface 4-3, the eddy current signal analyzer is provided with an instrument interface 8-1, and the signal line interface 4-3 is connected with the instrument interface 8-1 through a signal line 7. The eddy current signal can be fed into an eddy current signal analyzer.
The bottom of the impact body 5 is provided with an impact ball head 5-2 which is made of hard materials such as tungsten carbide and the like and has the function of impacting the surface of the detected material without deformation.
The impact body is made of a nonmagnetic material such as austenitic stainless steel or the like.
The structural form and material of the impact body and the impact ball head can be selected and adjusted according to the hardness range of the detected material.
The eddy current signal analyzer is used for acquiring eddy current signals transmitted by the eddy current coil device and can be used for processing to obtain the average speed of manual grooving between the distance coil 4-1 and the reference coil 4-2.
When the impact process is carried out, the impact body with the artificial notch passes through the distance coil and the reference coil in sequence, and eddy current signals respectively generated by the artificial notch are transmitted into the eddy current signal analyzer in sequence. The time interval Δ T1(s) during which the eddy current signal is generated is recorded, and the average impact velocity VAA is L/Δ T1.
When the impact body contacts the rebound process of the detected material 9, the impact body with the artificial notch passes through the reference coil and the distance coil in sequence, and eddy current signals respectively generated by the artificial notch are transmitted into the eddy current signal analyzer in sequence. The time interval Δ T2 during which the eddy current signal is generated is recorded, and the average rebound velocity VRA is L/Δ T2.
By the operational formula:
HA＝1000·VRA/VAA
and obtaining the uniform velocity rebound hardness value (HA) of the detected material.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (10)
1. The impact device of the uniform-speed rebound hardness tester based on the eddy current detection technology is characterized by comprising an eddy current signal analyzer and an impact assembly, wherein the eddy current signal analyzer is electrically connected with the impact assembly;
a spring mechanism is arranged in the loading sleeve, and an impact body is connected to the spring mechanism;
the eddy current coil assembly comprises an eddy current coil body, a distance coil and a reference coil are arranged on the upper portion of the eddy current coil body, the distance coil is located on the upper portion of the reference coil, and a distance is reserved between the distance coil and the reference coil;
the impact body is provided with an artificial notch, the impact body can penetrate through the distance coil and the reference coil on the eddy current coil body, and the artificial notch on the impact body can generate eddy current signals with the distance coil and the reference coil.
2. The apparatus of claim 1, wherein the release button is pressed, the spring mechanism powers the impact body, the impact body is separated from the spring mechanism and falls down the conduit, and the impact body can sequentially pass through the distance coil and the reference coil on the eddy current coil body.
3. The impact device of the uniform velocity rebound hardness tester based on the eddy current testing technology as claimed in claim 1, wherein a safety chuck is arranged on the top of the impact body, the safety chuck is connected with the spring mechanism, and the safety chuck can be separated from the spring mechanism by pressing a release button.
4. The impact device of the eddy current testing technology-based uniform velocity rebound hardness tester is characterized in that an impact ball head is arranged at the bottom of the impact body.
5. The eddy current inspection technology-based uniform velocity rebound durometer impact device of claim 4, wherein the impact bulb is made of tungsten carbide material.
6. The impact device of claim 1, wherein the impact body is made of a nonmagnetic material.
7. The impact device of the eddy current testing technology-based uniform velocity rebound hardness tester is characterized in that the manual notch is arranged at the outer upper wall of the impact body.
8. The apparatus of claim 1, wherein the eddy current signal can be fed into an eddy current signal analyzer.
9. The impact device of the uniform-velocity rebound hardness tester based on the eddy current testing technology as claimed in claim 1, wherein the eddy current coil body is provided with a signal line interface, the eddy current signal analyzer is provided with an instrument interface, and the signal line interface is connected with the instrument interface through a signal line.
10. The impact device of the eddy current testing technology-based uniform velocity rebound hardness tester is characterized in that a support ring is connected to the bottom of the eddy current coil assembly.
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| CN202120615425.9U CN215004794U (en) | 2021-03-26 | 2021-03-26 | Uniform-speed rebound hardness tester impact device based on eddy current testing technology |
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| CN202120615425.9U CN215004794U (en) | 2021-03-26 | 2021-03-26 | Uniform-speed rebound hardness tester impact device based on eddy current testing technology |
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| CN202120615425.9U Active CN215004794U (en) | 2021-03-26 | 2021-03-26 | Uniform-speed rebound hardness tester impact device based on eddy current testing technology |
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