Electromagnetic object linear expansion tester

Abstract

The invention relates to the technical field of test instruments, and discloses an electromagnetic object linear expansion tester, which comprises a bottom plate, one surface of the bottom plate is provided with a fixed plate, and one surface of the fixed plate is provided with a heat conduction plate; the heating assembly is used for generating heat and heating the sample through the heat conducting plate; the temperature measuring assembly is used for detecting the temperature change of the sample; the electric lead generates a magnetic field after being electrified; the Hall element is movably arranged at the end of the sample and connected with the power supply assembly, the sample drives the Hall element to move after being heated and expanded, the Hall element output voltage expression and the magnetic field expression are combined, the movement distance of the Hall element is obtained, and the linear expansion coefficient of the sample is calculated. The linear expansion coefficient of the sample is represented through the movement of the Hall element and the change of the Hall voltage, the expansion rule at the normal temperature can be measured, the expansion at the high temperature can also be measured, the application range is widened, and the accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of testing instruments, in particular to an electromagnetic object linear expansion tester. Background Art

[0002] In the field of materials science and engineering, measuring the linear expansion coefficient of an object is an important technical activity, especially in the process of material quality control, research and development, and application development. The linear expansion coefficient of an object refers to the rate of change of the unit length of the object under temperature changes, which is crucial to understanding the thermal stability and structural integrity of the material.

[0003] Traditional methods for measuring linear expansion coefficient usually involve mechanical measuring tools, which often rely on intermittent data readings and require manual recording of data at multiple time points. This method is not only inefficient, but also easily affected by operator skills and environmental factors, resulting in limited accuracy and repeatability of the measurement results.

[0004] In addition, many existing technologies can only work effectively within a specific temperature range, such as room temperature, and cannot adapt to wider temperature changes, which limits their effectiveness in high or low temperature application scenarios. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an electromagnetic object linear expansion tester, which solves the problems of low efficiency, poor accuracy and repeatability of traditional measurement methods.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an electromagnetic object linear expansion tester, comprising: A bottom plate, one side of which is mounted with a fixing plate, and one side of which is mounted with a heat conducting plate, for supporting the sample; A heating assembly, which is installed on the other side of the heat conducting plate and is used to generate heat and heat the sample through the heat conducting plate; A temperature measuring component is provided with a top surface of a heat conducting plate, and a measuring end of the temperature measuring component contacts an outer wall of the sample, for detecting temperature changes of the sample; A conductive wire, which is connected to a power supply component, and generates a magnetic field when the conductive wire is energized, and the power supply component is installed on the top surface of the bottom plate; The Hall element is movably arranged at the end of the sample and connected to the power supply component. When the sample expands due to heat, it drives the Hall element to move in the magnetic field generated by the conductive wire. At this time, the displacement of the Hall element in the magnetic field generated by the conductive wire can be obtained by combining the expression of the Hall voltage output by the Hall element and the expression of the magnetic field of the conductive wire. This displacement is the expansion amount of the sample.

[0007] Preferably, a cover is movably provided on the top surface of the heat conducting plate for wrapping the sample, and a handle is installed on the top surface of the heat conducting plate.

[0008] Preferably, a groove is provided on the outer side of the middle part of the top surface of the cover shell, and the wall thickness of the cover shell is smaller than the groove width of the groove, so as to provide deformation space for the expansion of the cover shell after the cover shell expands due to heat.

[0009] Preferably, the power supply assembly is connected to the conductive wire via a mounting plate, and the mounting plate is used to support the conductive wire.

[0010] Preferably, a groove is formed at the end of the sample, and the Hall element is located in the groove.

[0011] Preferably, the outer wall of the Hall element is provided with a first surface and a second surface, the first surface is connected to a first conductor, the second surface is connected to a second conductor, the first conductor is a current conductor, and the second conductor is a voltage conductor.

[0012] Preferably, the temperature measuring component is a temperature sensor, the heating component is a resistance wire, and the distance between the Hall element 5 and the conductive wire 6 is set to 3 to 5 cm.

[0013] The present invention provides an electromagnetic object linear expansion tester, which has the following beneficial effects: 1. In the present invention, the Hall element is installed and connected to the sample, and when the sample expands, the Hall element is driven to move in the magnetic field. By combining the expression of the Hall voltage output by the Hall element and the expression of the magnetic field of the conductive wire, the displacement of the Hall element in the magnetic field generated by the conductive wire can be obtained, and this displacement is the expansion of the sample. Compared with the prior art, the present invention can not only measure the expansion law of the object at room temperature, but also measure the expansion law of the object at high temperature.

[0014] 2. The present invention uses the Hall effect principle to accurately measure the linear expansion coefficient of the sample during the heating process. The use of the Hall element allows continuous tracking of the size changes of the sample. Compared with the traditional method that requires intermittent readings, this continuous monitoring method not only improves the accuracy of the measurement, but also enhances the repeatability of the data. Therefore, it can be widely used in teaching or actual measurement.

[0015] 3. The present invention can wrap the sample by using a cover, which can avoid the rapid loss of heat and thus increase the heating rate of the sample, thereby improving the efficiency of detection. At the same time, the wall thickness of the cover is smaller than the groove width of the groove, so that space can be provided for the heat expansion of the cover, thereby avoiding the cover and the heat conducting plate from getting stuck.

[0016] 4. The instrument of the present invention can also measure the physical negative expansion coefficient of the sample, and through the precise temperature control and displacement detection system, compared with the traditional stretching method, the present invention has higher measurement accuracy and efficiency, and a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the structure of the bottom plate of the present invention; Figure 3 This is a schematic diagram of the structure of the housing of the present invention; Figure 4 It is a front cross-sectional view of the present invention; Figure 5 for Figure 2 A in the enlarged view; Figure 6 This is a schematic diagram of the connection of the Hall element circuit of the present invention.

[0018] Among them, 1. bottom plate; 2. fixing plate; 3. heat conducting plate; 4. sample; 5. Hall element; 6. conductive wire; 7. heating component; 8. temperature measuring component; 9. power supply component; 10. cover; 11. groove; 12. surface one; 13. surface two; 14. wire one; 15. wire two; 16. mounting plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments. Please see attached Figure 1 -Attached Figure 6The embodiment of the present invention provides an electromagnetic object linear expansion tester, comprising: a bottom plate 1, on one side of which is mounted a fixing plate 2, and on one side of which is mounted a heat conducting plate 3 for supporting a sample 4; a heating component 7, which is mounted on the other side of the heat conducting plate 3, for generating heat and heating the sample 4 through the heat conducting plate 3; a temperature measuring component 8, which is provided with a top surface of the heat conducting plate 3, and a measuring end of the temperature measuring component 8 is in contact with an outer wall of the sample 4, for detecting a temperature change of the sample 4; a conductive wire 6, which is connected to a power supply component 9, and a magnetic field is generated when the conductive wire 6 is energized, and the power supply component 9 is mounted on the top surface of the bottom plate 1; a Hall element 5, which is movably arranged at the end of the sample 4 and connected to the power supply component 9, and the sample 4 expands due to heat, and drives the Hall element 5 to move in the magnetic field generated by the conductive wire 6. At this time, the output Hall voltage expression of the Hall element 5 and the magnetic field expression of the conductive wire 6 are combined to obtain the displacement of the Hall element 5 in the magnetic field generated by the conductive wire 6, and this displacement is the expansion amount of the sample 4.

[0021] In the present invention, after the Hall element 5 is installed at the end of the sample 4, the sample 4 is placed on the heat-conducting plate 3, and the other end thereof is in contact with the fixing plate 2. At this time, the heating component 7 can heat the sample 4 through the heat-conducting plate 3 to make it expand. Then, the sample 4 drives the Hall element 5 to move, and the conductive wire 6 generates a magnetic field after being energized. After the Hall element 5 moves, it gradually approaches the conductive wire 6, so the magnetic field it receives will gradually increase, that is, the output Hall voltage will also gradually increase. At this time, the output Hall voltage expression of the Hall element 5 and the magnetic field expression of the conductive wire 6 are combined to obtain the displacement of the Hall element 5 in the magnetic field generated by the conductive wire 6, and this displacement represents the length of the sample 4 after expansion. Therefore, the linear expansion coefficient of the sample 4 can be obtained through the expansion length and the initial length, and the linear expansion coefficient of the sample 4 at this temperature can be obtained through the temperature measuring component 8; Therefore, the expansion of sample 4 is continuously monitored by Hall element 5, and the expansion process of sample 4 is tracked in real time. Compared with the traditional intermittent measurement technology, this method can more accurately capture the dimensional changes of sample 4 during the heating process, thereby improving the measurement accuracy of the linear expansion coefficient; and by converting the change of Hall voltage into the expansion length of sample 4, the measurement process is automated. This automated processing reduces the possibility of human operation errors and improves the repeatability and reliability of the experiment; At the same time, by using the heat conducting plate 3 and the heating assembly 7, the present invention can control the temperature of the sample 4 and monitor it in real time through the temperature measuring assembly 8, so that the tester is not only suitable for measurements at room temperature, but also can effectively perform expansion measurements in high temperature environments. The application range of the device is enhanced, making it suitable for testing under more types of materials and environmental conditions.

[0022] A cover 10 is movably provided on the top surface of the heat conducting plate 3 for wrapping the sample 4, and a handle is installed on the top surface of the heat conducting plate 3. A groove 11 is provided on the outer side of the middle part of the top surface of the cover 10, and the wall thickness of the cover 10 is smaller than the groove width of the groove 11, which is used to provide deformation space for the expansion of the cover 10 after the cover 10 expands due to heat.

[0023] In the present invention, by wrapping the sample 4 with the cover 10, the rapid loss of heat can be avoided, thereby increasing the heating rate and further accelerating the test efficiency. At the same time, the wall thickness of the cover 10 is smaller than the groove width of the groove 11, which is used to provide a deformation space for the expansion of the cover 10 after the cover 10 expands due to heat, thereby also avoiding the cover 10 and the heat conducting plate 3 from getting stuck with each other after the cover 10 expands due to heat.

[0024] The power supply assembly 9 is connected to the conductive wire 6 via the mounting plate 16, and the mounting plate 16 is used to support the conductive wire 6. A groove is formed at the end of the sample 4, and the Hall element 5 is located in the groove.

[0025] In the present invention, the conductive wire 6 can be supported by using the mounting plate 16, and the groove 11 at the end of the sample 4 can realize the movable connection between the sample 4 and the Hall element 5, so that the Hall element 5 can be loaded and unloaded, thereby improving the flexibility of the device.

[0026] The outer wall of the Hall element 5 is provided with a first surface 12 and a second surface 13. The first surface 12 is connected to a first conductor 14, and the second surface 13 is connected to a second conductor 15. The first conductor 14 is a current line, and the second conductor 15 is a voltage line.

[0027] The Hall element 5 can be powered through the wire 14 to operate, and the Hall voltage output by the Hall element 5 can be derived through the wire 2 15 .

[0028] The temperature measuring component 8 is a temperature sensor, the heating component 7 is a resistance wire, and the distance between the Hall element 5 and the conductive wire 6 is set to 3 to 5 cm.

[0029] In the present invention, the temperature of the sample 4 can be monitored in real time by using a temperature sensor. Heat can be generated by a resistance wire, and the heat is transferred to the sample 4 through the heat conducting plate 3. At this time, the sample 4 can be heated to expand. The temperature sensor uses a PT100 temperature sensor, which has the following advantages: Wide temperature range: PT100 can measure the temperature range from -200℃ to +850℃, covering a wide range of application needs from low temperature to high temperature. It is very suitable for testing the linear expansion coefficient of objects under different temperature conditions.

[0030] High precision: PT100 is a platinum resistance temperature sensor that provides very high measurement accuracy, and its temperature error can be controlled within ±0.3℃, which is essential for precise measurement and scientific research.

[0031] Stability and reliability: Platinum is a very stable metal that is not easily oxidized, allowing PT100 to maintain good reliability and stability during long-term use.

[0032] Compatibility: The PT100 output signal can be easily interfaced with existing electronic devices, such as analog-to-digital converters (ADCs), facilitating integration into more complex systems for automated control and data logging. And considering that the tester may need to integrate the sensor with the heat conducting plate 3 or a part close to the sample 4, the PT100 has various installation methods (such as threaded installation, flange installation or band clamp installation), providing flexible installation options to adapt to different mechanical designs. The response time of the PT100 is usually fast enough to quickly reflect the change of the sample 4 temperature, which is very important for applications that need to continuously monitor temperature changes.

[0033] Working principle: When in use, firstly, the power supply component 9 supplies power to the conductive wire 6, at which time the conductive wire 6 will generate a magnetic field, then the Hall element 5 is installed in the groove at one end of the sample 4, then the sample 4 is placed on the heat conducting plate 3, and the other end of the sample 4 is in contact with one side of the fixed plate 2, at this time, the power supply component 9 is used to supply power to the Hall element 5 to make it run, finally, the cover 10 is placed on the heat conducting plate 3, and the bottom of the cover 10 is stuck in the groove 11, and then the temperature measuring component 8 can be used to detect the temperature of the sample 4 at this time, when it is necessary to heat the sample 4, the power supply component 9 is used to heat the heating component 7, and the heat generated by the heating component 7 will be transferred to the sample 4 through the heat conducting plate 3, and when the sample 4 is heated, the sample 4 will expand and enter This drives the Hall element 5 to move, and then makes the Hall element 5 move in the magnetic field generated by the conductive wire 6, and at this time the Hall element 5 will gradually approach the conductive wire 6, so the magnetic field strength to which the Hall element 5 is subjected will gradually increase, and therefore the Hall voltage output by the Hall element 5 through the wire 2 15 will also increase accordingly, and by obtaining the difference between the output voltage of the sample 4 before expansion and the output voltage after expansion, and then combining the output voltage formula of the Hall element 5 with the magnetic field formula of the conductive wire 6, the displacement of the Hall element in the magnetic field can be obtained, and this distance is the expansion amount of the sample 4, and the linear expansion coefficient of the sample 4 can be obtained through the expansion amount and the initial length of the sample 4, and the linear expansion coefficient of the sample 4 at this temperature can be obtained by combining the temperature of the sample 4 detected by the temperature measuring component 8.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic object linear expansion tester, characterized in that: include: A bottom plate (1) having a fixing plate (2) mounted on one side thereof, and a heat conducting plate (3) mounted on one side of the fixing plate (2) for supporting a sample (4); A heating component (7) is installed on the other side of the heat conducting plate (3) and is used to generate heat and heat the sample (4) through the heat conducting plate (3); A temperature measuring component (8) is provided with a top surface of a heat conducting plate (3), and a measuring end of the temperature measuring component (8) is in contact with an outer wall of the sample (4), and is used to detect temperature changes of the sample (4); A conductive wire (6) connected to a power supply component (9), wherein the conductive wire (6) generates a magnetic field when energized, and the power supply component (9) is mounted on the top surface of the base plate (1); The Hall element (5) is movably arranged at the end of the sample (4) and connected to the power supply component (9). When the sample (4) is heated and expanded, the Hall element (5) is driven to move in the magnetic field generated by the conductive wire (6). At this time, the output Hall voltage expression of the Hall element (5) and the magnetic field expression of the conductive wire (6) are combined to obtain the displacement of the Hall element (5) in the magnetic field generated by the conductive wire (6), and this displacement is the expansion amount of the sample (4).

2. The electromagnetic object linear expansion tester according to claim 1, characterized in that: A cover shell (10) is movably provided on the top surface of the heat conducting plate (3) for wrapping the sample (4), and a handle is installed on the top surface of the heat conducting plate (3).

3. The electromagnetic object linear expansion tester according to claim 2, characterized in that: A groove (11) is provided on the outer side of the middle portion of the top surface of the cover shell (10), and the wall thickness of the cover shell (10) is smaller than the groove width of the groove (11), so as to provide a deformation space for the expansion of the cover shell (10) after the cover shell (10) expands due to heat.

4. The electromagnetic object linear expansion tester according to claim 1, characterized in that: The power supply assembly (9) is connected to the conductive wire (6) via a mounting plate (16), and the mounting plate (16) is used to support the conductive wire (6).

5. The electromagnetic object linear expansion tester according to claim 1, characterized in that: A groove is provided at the end of the sample (4), and the Hall element (5) is located in the groove.

6. The electromagnetic object linear expansion tester according to claim 1, characterized in that: The outer wall of the Hall element (5) is provided with a first surface (12) and a second surface (13); the first surface (12) is connected to a first conductor (14); the second surface (13) is connected to a second conductor (15); the first conductor (14) is a current conductor; and the second conductor (15) is a voltage conductor.

7. The electromagnetic object linear expansion tester according to claim 1, characterized in that: The temperature measuring component (8) is a temperature sensor, and the heating component (7) is a resistance wire.

8. The electromagnetic object linear expansion tester according to claim 1, characterized in that: The distance between the Hall element (5) and the conductive wire (6) is set to be 3 to 5 cm.

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