Young modulus measuring device

Abstract

The utility model belongs to the technical field of material characteristic measurement, and relates to a Young modulus measuring device which comprises a supporting plate, a first supporting column and a second supporting column are arranged on the surface of one side of the supporting plate; the fixing assembly at least comprises a supporting frame, the two ends of the supporting frame are fixedly arranged on the surfaces of the sides, away from the supporting plate, of the first supporting column and the second supporting column respectively, and at least one clamping groove is formed in the surface of the side, away from the supporting plate, of the supporting frame and used for fixing a to-be-tested material; the knocking assembly comprises an electromagnetic valve control circuit used for receiving the pulse signal sent by the control assembly and outputting a control signal; the electromagnetic valve is used for knocking the to-be-tested material under the driving of the control signal; the measuring assembly is used for collecting a vibration frequency signal generated when the to-be-measured material is knocked; the control assembly is used for generating a pulse signal and transmitting the pulse signal to the electromagnetic valve control circuit; receiving the vibration frequency signal collected by the measuring assembly, and obtaining the Young modulus of the to-be-measured material based on the vibration frequency signal.

Description

Technical Field

[0001] This utility model relates to the field of material property measurement technology, and in particular to a Young's modulus measuring device. Background Technology

[0002] Young's modulus is a physical quantity that characterizes the tensile or compressive strength of a material within its elastic limit. By measuring the Young's modulus of a material, we can accurately understand its ability to resist deformation under stress, and thus evaluate its strength, stiffness, and other properties, providing a basis for material selection and application in different scenarios. For example, in the aerospace field, materials with high Young's modulus are required to manufacture structural components of aircraft to ensure that the deformation of the aircraft is minimal when subjected to huge flight loads, thereby ensuring flight safety.

[0003] Traditional devices for measuring Young's modulus are primarily static measuring devices. They calculate Young's modulus by applying an external force to the material and using an optical lever amplification method to measure the material's elongation. Figure 1 The image shows a static Young's modulus meter with a hanging mechanism. Its measurement principle is as follows: an external force F is applied to a metal A with length L and cross-sectional area S, and the elongation of metal A is measured using an optical lever amplification measuring device Y. The Young's modulus E of metal A satisfies the formula If the diameter of metal A is d, then the cross-sectional area is... This can be further deduced However, since the elongation of the material during the stretching process is extremely small, even the elongation measured using the optical lever amplification method will still have errors, resulting in low accuracy of the measured Young's modulus.

[0004] To avoid the problem of low accuracy in Young's modulus measurement caused by inaccurate measurement of material deformation, existing technologies propose dynamic measurement devices. These devices utilize a signal generator to produce an electrical signal and transmit it to an exciter. The exciter then converts the electrical signal into mechanical vibration, which is transmitted to the material under test, causing it to vibrate. A vibration pickup then converts the vibration signal back into an electrical signal and transmits it to an oscilloscope. The resonant frequency of the material is obtained from the sine wave signal output by the oscilloscope, thereby calculating the Young's modulus. Figure 2 The diagram shows the measurement principle of a dynamic measuring device. When a slender tubular material with a length much greater than its outer diameter undergoes a small transverse vibration, the influence of longitudinal vibration on transverse vibration can be ignored because the length of the material is much greater than its outer diameter. Furthermore, assuming that the material undergoes only a small deformation in the transverse direction during vibration, its transverse vibration equation is: ,in, Indicates the density of the material. Represents the cross-sectional area of ​​the material. Represents the moment of inertia. Let y represent Young's modulus. When the material's axis is along the x-axis, y in the equation represents the material's displacement in the z-direction at a distance x from the left side of the cross section. By separating variables and solving the above equation, the expression for Young's modulus can be obtained: , ,in, Indicates the outer diameter of the material. This indicates the inner diameter of the material, from which Young's modulus can be further derived. , Indicates the length of the material. Indicates material quality. The resonant frequency is indicated; however, since the vibrator operates based on electromagnetic principles, changes in the current and temperature of its electromagnetic coil will cause changes in resistance, affecting the output power of the vibrator. This makes the excitation force generated by the vibrator unstable, making it difficult to accurately measure the resonant frequency of the material under test, thus affecting the accuracy of the measurement results. At the same time, the vibrator needs sufficient power to drive the vibration of the material under test. In order to achieve efficient energy conversion and frequency response, the vibrator usually includes multiple components such as electromagnetic coils, permanent magnets, and elastic elements, which have high material and manufacturing costs, resulting in a high cost for the entire Young's modulus measurement device.

[0005] In summary, existing Young's modulus measuring devices suffer from low measurement accuracy and high cost. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the problems of low measurement accuracy and high cost of the existing Young's modulus measuring device.

[0007] To solve the above-mentioned technical problems, this utility model provides a Young's modulus measuring device, comprising:

[0008] A support plate, on one side surface of which are provided a first support column and a second support column;

[0009] The fixing component includes at least one support frame, with both ends of the support frame respectively fixedly disposed on the surface of the first support column and the second support column away from the support plate. The surface of the support frame away from the support plate is provided with at least one slot, through which the material to be tested is fixed to the surface of the support frame.

[0010] The tapping component specifically includes:

[0011] The solenoid valve control circuit has its input terminal connected to the control component and its output terminal connected to the solenoid valve. It is used to receive pulse signals sent by the control component and output control signals to the solenoid valve based on the pulse signals.

[0012] A solenoid valve is installed on the side of the support frame, with its valve core facing the material to be tested. It is used to strike the material to be tested by moving the valve core under the drive of the control signal.

[0013] A measuring component is used to acquire the vibration frequency signal generated when the material under test is struck.

[0014] A control component, connected to the solenoid valve control circuit and the measuring component, is used to generate a pulse signal and transmit the pulse signal to the solenoid valve control circuit; receive the vibration frequency signal collected by the measuring component, and obtain the Young's modulus of the material under test based on the vibration frequency signal.

[0015] Preferably, the solenoid valve control circuit includes:

[0016] The regulated power supply has its negative terminal grounded.

[0017] The first transistor has its base connected to the output terminal of the control component, its collector connected to the positive terminal of the regulated power supply, and its emitter grounded.

[0018] The second transistor has its collector connected to the collector of the first transistor, and its emitter grounded.

[0019] The third transistor has its base connected to the collector of the second transistor, its collector connected to the positive terminal of the regulated power supply, and its emitter grounded.

[0020] A field-effect transistor, the gate of which is connected to the base of the second transistor and the collector of the third transistor, the drain of which is connected to the positive terminal of the regulated power supply, and the source of which is grounded;

[0021] The first reverse diode has its positive terminal connected to the source of the field-effect transistor and its negative terminal grounded.

[0022] The second reverse diode has its negative terminal connected to the positive terminal of the first reverse diode as the output terminal of the solenoid valve control circuit, and its positive terminal is grounded.

[0023] Preferably, the solenoid valve control circuit further includes:

[0024] The first resistor has one end connected to the output terminal of the control component and the other end connected to the base of the first transistor.

[0025] The second resistor has one end connected to the collector of the first transistor and the other end connected to the positive terminal of the regulated power supply.

[0026] The first capacitor has its positive terminal connected to the collector of the first transistor and its negative terminal connected to the base of the third transistor.

[0027] The third resistor has one end connected to the base of the third transistor and the other end connected to the positive terminal of the regulated power supply.

[0028] The fourth resistor has one end connected to the collector of the third transistor and the other end connected to the positive terminal of the regulated power supply.

[0029] The fifth resistor has one end connected to the base of the second transistor and the other end connected to the collector of the third transistor.

[0030] The sixth resistor has one end connected to the source of the field-effect transistor and the other end grounded.

[0031] The second capacitor has its positive terminal connected to the drain of the field-effect transistor and its negative terminal grounded.

[0032] The positive terminal of the third capacitor is connected to the negative terminal of the first reverse diode, and its negative terminal is grounded.

[0033] Preferably, the solenoid valve control circuit further includes:

[0034] The positive terminal of the current measurement module is connected to the positive terminal of the first reverse diode and the negative terminal of the second reverse diode, and its negative terminal is connected to the output terminal of the solenoid valve control circuit.

[0035] The voltage measurement module has its positive terminal connected to the output terminal of the solenoid valve control circuit, and its negative terminal grounded.

[0036] Preferably, the first transistor, the second transistor, and the third transistor are all NMOS transistors.

[0037] Preferably, the measuring component is a microphone sensor, which is mounted on the support frame with its microphone port facing the material to be measured. Its positive terminal is connected to the output terminal of the control component, and its negative terminal is grounded.

[0038] Preferably, the control component includes:

[0039] A serial port screen is used to input vibration control signals so that the Arduino microcontroller can generate pulse signals based on the vibration control signals; it also receives and displays the Young's modulus of the material under test.

[0040] An Arduino microcontroller has its first I / O port connected to the serial port screen, its second I / O port connected to the input terminal of the solenoid valve control circuit, and its third I / O port connected to the output terminal of the measurement component. It is used to generate a pulse signal based on the vibration control signal, send the pulse signal to the solenoid valve control circuit, so that the solenoid valve control circuit outputs a control signal based on the pulse signal, thereby driving the solenoid valve to strike the material under test. It also receives the vibration frequency signal collected by the measurement component and obtains the Young's modulus of the material under test based on the vibration frequency signal.

[0041] Preferably, it also includes a fishing line for fixing the material to be tested onto the slot.

[0042] Preferably, the solenoid valve control circuit is disposed on the surface of the support plate near the support frame, and is perpendicular to the solenoid valve.

[0043] Preferably, the fixing assembly includes three support frames;

[0044] The distance between two adjacent support frames gradually increases or gradually decreases;

[0045] At least one of the support frames has multiple slots on its surface, and the test material of different lengths can be fixed on the three support frame surfaces by using the slots at different positions.

[0046] The Young's modulus measuring device provided by this utility model sets a first support column and a second support column on a support plate, and sets a support frame on the surface of the first support column and the second support column. The material to be tested is fixed in the slot on the surface of the support frame, so that the material to be tested is kept in a suspended state. Then, a solenoid valve is set on the side of the support frame, so that the valve core of the solenoid valve faces the material to be tested. The solenoid valve control circuit outputs a control signal to drive the solenoid valve to strike the material to be tested. Then, the measuring component collects the vibration frequency generated by the strike on the material to be tested, and the control component obtains the Young's modulus of the material to be tested based on the vibration frequency. Because the electromagnetic force of the solenoid valve acts rapidly and the valve core response time is short, it can respond to the control signal in a timely manner to complete the striking action and quickly reset, thereby achieving high-frequency and stable striking. This provides stable vibration excitation for the material under test, avoiding the problem of unstable excitation force caused by unstable output power when using a vibrator as the vibration excitation, which affects the accuracy of the measurement results. At the same time, since the production and maintenance costs of the solenoid valve and its control circuit are low, and the power consumption of the solenoid valve during operation is also relatively low, this application uses the solenoid valve and its control circuit as the striking component, which is not only convenient to connect and simple to install, reducing the complexity and size of the entire Young's modulus measuring device, but also reducing the production, operating and maintenance costs of the entire device. Attached Figure Description

[0047] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0048] Figure 1 A schematic diagram of the static Young's modulus tester with sequential hanging structure provided in this application;

[0049] Figure 2 A schematic diagram of the measurement principle of the dynamic measuring device provided in this application;

[0050] Figure 3 A schematic diagram of the Young's modulus measuring device provided in this application;

[0051] Figure 4 A schematic diagram of the Young's modulus measuring device provided in this application;

[0052] Figure 5 A schematic diagram of the circuit principle of the Young's modulus measuring device provided in this application;

[0053] Explanation of reference numerals in the accompanying drawings: 1. Support plate; 11. First support column; 12. Second support column; 2. Fixing component; 21. Support frame; 22. Slot; 3. Material to be tested; 4. Impact component; 41. Solenoid valve control circuit; 42. Solenoid valve; 5. Measurement component; 6. Control component; 61. Serial port screen; 62. Arduino microcontroller. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0055] Please see Figure 3 and Figure 4 , Figure 3 The diagram shown is a schematic diagram of the Young's modulus measuring device provided in this application. Figure 4 The image shows a physical diagram of the Young's modulus measuring device provided in this application. The Young's modulus measuring device includes a support plate 1, a fixing component 2 for fixing the material to be measured 3, a striking component 4, a measuring component 5, and a control component 6.

[0056] A first support column 11 and a second support column 12 are provided on one side surface of the support plate 1.

[0057] Specifically, the materials of the support plate 1, the first support column 1, and the second support column 12 can be composed of acrylic plates and aluminum alloy materials, which can make the whole device more stable when the material to be tested is struck.

[0058] The fixing component 2 includes at least one support frame 21. The two ends of the support frame 21 are respectively fixed on the surface of the first support column 11 and the second support column 12 away from the support plate 1. The surface of the support frame 21 away from the support plate 1 is provided with at least one slot 22, through which the material to be tested 3 is fixed to the surface of the support frame 2.

[0059] Specifically, in a specific example of this application, the material to be tested 3 is a slender copper tube. By clamping the copper tube in the slot 22, the copper tube is kept suspended on the surface of the support frame 21, that is, the copper tube is set at an angle to the support frame 21.

[0060] Furthermore, in some embodiments of this application, the card slot 22 is a 3D printed part, which can be designed according to the size of the material to be tested 3. Only by changing the parameters in the 3D model based on the size of the material to be tested 3, a card slot 22 that matches the material to be tested 3 can be obtained.

[0061] Optionally, since the test material 3 needs to maintain a stable frequency output when it is struck, in some embodiments of this application, after the test material 3 is inserted into the slot 22, a fishing line is used to tie the test material 3 to the slot 22 to further fix the test material 3. Since the fishing line has little effect on the vibration frequency of the test material 3, the embodiments of this application use a fishing line to further fix the test material 3 and keep it suspended, which can minimize the occurrence of a snapping sound when the test material 3 is struck and ensure the stability of its output frequency.

[0062] Optionally, in some embodiments, in order to make the material under test 3 more stably remain suspended, the number of support frames 21 can be increased, such as... Figure 3 As shown, by placing the test material 3 on the surface of multiple support frames 21, the stability of the test material 3 during the tapping process is ensured.

[0063] Furthermore, the distance between adjacent support frames 21 can be gradually increased or decreased. By setting slots 22 at different positions on at least one support frame 21, it can be used to fix materials 3 of different lengths to be tested.

[0064] The striking assembly 4 includes a solenoid valve control circuit 41 and a solenoid valve 42.

[0065] The input terminal of the solenoid valve control circuit 41 is connected to the control component 6, and its output terminal is connected to the solenoid valve 42. It is used to receive the pulse signal sent by the control component 6 and output a control signal to the solenoid valve 42 based on the pulse signal.

[0066] The solenoid valve 42 is located on the side of the support frame 21, with its valve core facing the material to be tested 3. It is used to strike the material to be tested 3 by moving the valve core under the drive of the control signal.

[0067] The measuring component 5 is used to collect the vibration frequency signal generated when the material under test 3 is struck.

[0068] The control component 6 is connected to the solenoid valve control circuit 41 and the measuring component 5. It is used to generate pulse signals and transmit the pulse signals to the solenoid valve control circuit 41. At the same time, it receives the vibration frequency signal collected by the measuring component 5 and obtains the Young's modulus of the material to be tested 3 based on the vibration frequency signal.

[0069] like Figure 5 The diagram shown is a circuit diagram of a Young's modulus measuring device provided in this application. As can be seen from the diagram, the solenoid valve control circuit 41 specifically includes:

[0070] The regulated power supply U has its negative terminal grounded.

[0071] In a specific example of this application, the voltage of the regulated power supply U is 15V.

[0072] The first transistor Q1 has its base connected to the output terminal of the control component 6, its collector connected to the positive terminal of the regulated power supply U, and its emitter grounded.

[0073] The collector of the second transistor Q2 is connected to the collector of the first transistor Q1, and its emitter is grounded.

[0074] The base of the third transistor Q3 is connected to the collector of the second transistor Q2, and its collector is connected to the positive terminal of the regulated power supply U. Its emitter is grounded.

[0075] The gate of the field-effect transistor Q4 is connected to the base of the second transistor Q2 and the collector of the third transistor Q3, its drain is connected to the positive terminal of the regulated power supply U, and its source is grounded.

[0076] The first reverse diode D1 has its positive terminal connected to the source of the field-effect transistor Q4, and its negative terminal grounded.

[0077] The negative terminal of the second reverse diode D2 is connected to the positive terminal of the first reverse diode D1 and serves as the output terminal of the solenoid valve control circuit 41, while its positive terminal is grounded.

[0078] Furthermore, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all NMOS transistors.

[0079] In this embodiment, a field-effect transistor Q4 is used as a switching element, allowing a current of up to 1A to flow, thereby meeting the requirements for generating the vibration frequency of the material under test 3. Simultaneously, since a brief 5V pulse signal is sufficient to drive the field-effect transistor Q4 to conduct, thus enabling the solenoid valve drive circuit 41 to operate, this application utilizes the discharge characteristics of the first transistor Q1, the second transistor Q2, and the third transistor Q3 to control the conduction time of the field-effect transistor Q4, ensuring that the field-effect transistor Q4 automatically turns off after a specific time. Even when the control component 6 continuously outputs a high-level pulse signal, it can prevent the field-effect transistor Q4 from continuously conducting, thus preventing overheating and damage to the device and ensuring circuit safety. Furthermore, this embodiment also uses the first reverse diode D1 and the second reverse diode D2 to absorb the reverse current generated in the solenoid valve control circuit, thereby preventing damage to components.

[0080] Furthermore, the solenoid valve control circuit 41 also includes:

[0081] The first resistor R1 has one end connected to the output terminal of the control component 6 and the other end connected to the base of the first transistor Q1.

[0082] The second resistor R2 has one end connected to the collector of the first transistor Q1 and the other end connected to the positive terminal of the regulated power supply U.

[0083] The positive terminal of the first capacitor C1 is connected to the collector of the first transistor Q1, and the negative terminal is connected to the base of the third transistor Q3.

[0084] The third resistor R3 has one end connected to the base of the third transistor Q3 and the other end connected to the positive terminal of the regulated power supply U.

[0085] The fourth resistor R4 has one end connected to the collector of the third transistor Q3, and the other end connected to the positive terminal of the regulated power supply U.

[0086] The fifth resistor R5 has one end connected to the base of the second transistor Q2 and the other end connected to the collector of the third transistor Q3.

[0087] The sixth resistor R6 has one end connected to the source of the field-effect transistor Q4, and the other end grounded.

[0088] The positive terminal of the second capacitor C2 is connected to the drain of the field-effect transistor Q4, and its negative terminal is grounded.

[0089] The positive terminal of the third capacitor C3 is connected to the negative terminal of the first reverse diode D1, and its negative terminal is grounded.

[0090] By adding an RC circuit consisting of a capacitor and a resistor to the solenoid valve control circuit 41, its discharge characteristics can be used to control the operating time of the field-effect transistor Q4 together with the first transistor Q1, the second transistor Q2 and the third transistor Q3.

[0091] Furthermore, in some embodiments of this application, in order to monitor the state of the solenoid valve control circuit 41 in real time and to detect any abnormalities in the solenoid valve control circuit 41 in a timely manner, the solenoid valve control circuit 41 further includes:

[0092] The positive terminal of the current measurement module SI is connected to the positive terminal of the first reverse diode D1 and the negative terminal of the second reverse diode D2, and its negative terminal is connected to the output terminal of the solenoid valve control circuit 41.

[0093] The positive terminal of the voltage measurement module SU is connected to the output terminal of the solenoid valve control circuit 41, and its negative terminal is grounded.

[0094] Optionally, in some embodiments of this application, the solenoid valve control circuit 41 is disposed on the surface of the support plate 1 near the support frame 21, and is perpendicular to the solenoid valve 42.

[0095] Specifically, such as Figure 5 As shown, in some embodiments of this application, the measuring component 5 is a microphone sensor, which is mounted on the support frame 21, with the microphone port facing the material to be measured 3. Its positive terminal is connected to the output terminal of the control component 6, and its negative terminal is grounded.

[0096] Specifically, such as Figure 3 and Figure 5 As shown, the control component 6 includes a serial port screen 61 and an Arduino microcontroller 62.

[0097] The serial port screen 61 is used to input vibration control signals so as to control the Arduino microcontroller 62 to generate pulse signals based on the vibration control signals; at the same time, it receives and displays the Young's modulus of the material under test 3 after the measurement is completed.

[0098] The first I / O port of the Arduino microcontroller 62 is connected to the serial port screen 61, the second I / O port is connected to the input terminal of the solenoid valve control circuit 41, and the third I / O port is connected to the output terminal of the measurement component 5. It is used to generate a pulse signal based on the vibration control signal, send the pulse signal to the solenoid valve control circuit 41, so that the solenoid valve control circuit 41 outputs a control signal based on the pulse signal, thereby driving the solenoid valve 42 to strike the material under test 3, and receiving the vibration frequency signal collected by the measurement component 4, and obtaining the Young's modulus of the material under test 3 based on the vibration frequency signal.

[0099] After receiving the vibration frequency signal of the material under test 3, the Arduino microcontroller 62 can calculate the Young's modulus of the material under test 3 using the existing Young's modulus calculation formula. Specifically, the Young's modulus calculation formula is as follows: , ,in, Indicates the outer diameter of the material to be measured. This indicates the inner diameter of the material being measured, from which Young's modulus can be further derived. , Indicates the length of the material to be measured. Indicates the mass of the material to be tested. It represents the vibration frequency signal.

[0100] This embodiment of the application uses a serial port screen 61 and an Arduino microcontroller 62 as control components. The vibration control signal required during the measurement process can be input through the serial port screen 61, and then the Arduino microcontroller 62 generates a corresponding pulse signal to control the striking frequency of the striking component 4. At the same time, the serial port screen 61 can display the Young's modulus measurement results in real time, which is convenient for users to monitor the Young's modulus value of the material 3 under test, ensuring the real-time performance and visualization of the data.

[0101] The Young's modulus measuring device provided in this application uses a support plate and fixing components to fix the material to be tested, ensuring that the material is suspended and its stability during the tapping process. A solenoid valve control circuit and a solenoid valve are used as the tapping component. Under the control of the control component, the movement of the solenoid valve core taps the material to be tested. Then, a microphone sensor collects the vibration frequency of the material to be tested in real time and transmits it to the control component, which outputs the Young's modulus of the material in real time. This not only improves measurement accuracy but also makes the device simple, easy to connect, and increases the overall integration of the device, simplifying the device structure and operation process, and reducing the cost and power consumption of the device.

[0102] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A Young's modulus measuring device, characterized by, The utility model relates to a kind of Young's modulus measuring device, including: Support plate, one side surface is provided with first support column and second support column; Fixed assembly, at least including one support frame, the both ends of the support frame are fixedly arranged in the first support column and the second support column away from the one side surface of the support plate, the support frame is away from the one side surface of the support plate and is provided with at least one clamping groove, and the material to be measured is fixed on the surface of the support frame by the clamping groove; Knocking assembly, it specifically includes: Solenoid valve control circuit, its input end is connected with control component, its output end is connected with solenoid valve, for receiving the pulse signal sent by the control component, and control signal is output to the solenoid valve based on the pulse signal; Solenoid valve, it is arranged on the side of the support frame, and the spool is directly opposite the material to be measured, for being driven by the control signal and being knocked by spool movement to the material to be measured; Measuring assembly, for collecting the vibration frequency signal generated when the material to be measured is knocked; Control component, it is connected with solenoid valve control circuit and measuring assembly, for generating pulse signal, and transmitting the pulse signal to solenoid valve control circuit;Receive the vibration frequency signal collected by the measuring assembly, and the Young's modulus of the material to be measured is obtained based on the vibration frequency signal.

2. The Young's modulus measuring apparatus according to claim 1, characterized by The solenoid valve control circuit includes: Stabilized power supply, its negative pole is grounded; First transistor, its base is connected with the output end of the control component, its collector is connected with the positive pole of the stabilized power supply, and its emitter is grounded; Second transistor, its collector is connected with the collector of the first transistor, and its emitter is grounded; Third transistor, its base is connected with the collector of the second transistor, its collector is connected with the positive pole of the stabilized power supply, and its emitter is grounded; Field effect transistor, its gate is connected with the base of the second transistor and the collector of the third transistor, its drain is connected with the positive pole of the stabilized power supply, and its source is grounded; First reverse diode, its anode is connected with the source of the field effect transistor, and its cathode is grounded; Second reverse diode, its cathode is connected with the anode of the first reverse diode as the output end of the solenoid valve control circuit, and its anode is grounded.

3. The Young's modulus measuring apparatus according to claim 2, wherein The solenoid valve control circuit further includes: First resistance, one end is connected with the output end of the control component, and the other end is connected with the base of the first transistor; Second resistance, one end is connected with the collector of the first transistor, and the other end is connected with the positive pole of the stabilized power supply; First capacitor, its anode is connected with the collector of the first transistor, and its cathode is connected with the base of the third transistor; Third resistance, one end is connected with the base of the third transistor, and the other end is connected with the positive pole of the stabilized power supply; Fourth resistance, one end is connected with the collector of the third transistor, and the other end is connected with the positive pole of the stabilized power supply; Fifth resistance, one end is connected with the base of the second transistor, and the other end is connected with the collector of the third transistor; Sixth resistance, one end is connected with the source of the field effect transistor, and the other end is grounded; Second capacitor, its anode is connected with the drain of the field effect transistor, and its cathode is grounded. A third capacitor, whose positive pole is connected with the negative pole of the first reverse diode, and whose negative pole is grounded.

4. The Young's modulus measuring apparatus according to claim 3, wherein The electromagnetic valve control circuit further comprises: A current measurement module, whose positive pole is connected with the positive pole of the first reverse diode and the negative pole of the second reverse diode, and whose negative pole is connected with the output end of the electromagnetic valve control circuit; A voltage measurement module, whose positive pole is connected with the output end of the electromagnetic valve control circuit, and whose negative pole is grounded.

5. The Young's modulus measuring apparatus according to claim 2, wherein The first transistor, the second transistor and the third transistor are all NMOS transistors.

6. The Young's modulus measuring apparatus according to claim 1, wherein The measurement component is a microphone sensor, which is arranged on the support frame, and whose sound collecting opening is directly opposite the material to be measured, whose positive pole is connected with the output end of the control component, and whose negative pole is grounded.

7. The Young's modulus measuring apparatus according to claim 1, wherein The control component comprises: A serial port screen, which is used for inputting a vibration control signal, so as to control the Arduino single-chip microcomputer to generate a pulse signal based on the vibration control signal, and receiving and displaying the Young's modulus of the material to be measured; An Arduino single-chip microcomputer, whose first I / O port is connected with the serial port screen, whose second I / O port is connected with the input end of the electromagnetic valve control circuit, and whose third I / O port is connected with the output end of the measurement component, which is used for generating a pulse signal based on the vibration control signal, sending the pulse signal to the electromagnetic valve control circuit, so that the electromagnetic valve control circuit outputs a control signal based on the pulse signal, thereby driving the electromagnetic valve to knock the material to be measured, and receiving the vibration frequency signal collected by the measurement component, and obtaining the Young's modulus of the material to be measured based on the vibration frequency signal.

8. The Young's modulus measuring apparatus according to claim 1, wherein A fishing line is further arranged, which is used for fixing the material to be measured on the clamping groove.

9. The Young's modulus measuring apparatus according to claim 1, wherein The electromagnetic valve control circuit is arranged on the surface of the support plate close to the side surface of the support frame, and vertically corresponds to the electromagnetic valve.

10. The Young's modulus measuring apparatus according to claim 1, wherein The fixing component comprises three support frames. The distance between two adjacent support frames gradually increases or gradually decreases. At least one surface of the support frame is provided with a plurality of clamping grooves, so that the materials to be measured with different lengths are fixed on the surfaces of the three support frames by using the clamping grooves at different positions.

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