Stress loading device and method for amorphous alloy magnetic property measurement

Abstract

The invention relates to a stress loading device and method for amorphous alloy magnetic property measurement, and belongs to the technical field of amorphous alloy magnetic property measurement, and the device comprises the steps: to-be-measured amorphous alloy is placed in a magnet exciting coil, passes through an iron yoke, and is connected with a loading end of an electromagnet loading part; the electromagnet loading part is used for carrying out stress loading on the to-be-tested amorphous alloy from two ends of the to-be-tested amorphous alloy; and the double-H coil is placed in the excitation coil, and the magnetic characteristics of the amorphous alloy are measured by accurately measuring the magnetic flux density and the magnetic field intensity after the pressure is stable. The anti-fracture clamp is made of a polyether-ether-ketone material, is mounted in an inner cavity of the excitation coil and is used for clamping and fixing the amorphous alloy to be detected from the upper side and the lower side of the amorphous alloy to be detected; and the double-H coil is placed in a groove formed in the upper surface of the anti-fracture clamp. The mechanical stress scene borne by the amorphous alloy in actual complex working conditions can be simulated, and an effective solution is practically provided for amorphous alloy magnetic characteristic measurement environments needing to consider mechanical stress factors.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring magnetic properties of amorphous alloys, and in particular relates to a stress loading device and method for measuring magnetic properties of amorphous alloys. Background Art

[0002] Amorphous alloys, also known as metallic glass or non-crystalline alloys, are special materials whose atoms are arranged in a disordered state and lack a long-range ordered structure. Compared with traditional crystalline alloys, their unique atomic structure gives them excellent magnetic properties, making them key and indispensable magnetic materials in motors, transformers and other equipment. However, under the action of mechanical stress, the excellent magnetic properties of amorphous alloys will occur, which not only reduces the electromagnetic conversion efficiency, but also causes heat accumulation. The size of the hysteresis loss is proportional to the area enclosed by the hysteresis loop, and because the hysteresis loop of amorphous alloys is narrow, its hysteresis loss is relatively low. In the design stage of electrical equipment, in order to accurately evaluate the hysteresis loss, it is crucial to accurately measure the magnetic properties of amorphous alloys.

[0003] However, the current problem is that most of the existing amorphous alloy magnetic property measurement devices place the test sample in the chamber of the measuring coil, and mainly conduct research on standard working conditions. However, in actual application environments, amorphous alloys will be affected by various stresses during manufacturing and operation. These stresses include: electromagnetic force generated at the junction of the core and the air gap, magnetic stress caused by magnetostriction, thermal stress caused by temperature changes (such as stress caused by silicon steel sheets and their supporting structures due to differences in expansion or contraction), and mechanical vibration, impact and external forces generated during assembly. The presence of these stresses will significantly change the magnetic properties of amorphous alloys, not only affecting the performance of transformers, but may even endanger the safe operation of electrical equipment. It can be seen that it is difficult to accurately reflect the actual situation of amorphous alloys under actual complex working conditions by relying solely on the magnetic property measurement results under standard working conditions.

[0004] Therefore, in order to more comprehensively evaluate the magnetic properties of amorphous alloys, a measurement method that can simulate actual stress conditions is particularly urgent and important. This will not only help improve the design accuracy and operational reliability of electrical equipment, but also provide a solid scientific basis for the application of amorphous alloys in a wider range of fields. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a stress loading device and method for measuring the magnetic properties of amorphous alloys, which is specifically for measuring the magnetic properties of amorphous alloys and loading mechanical stress. The purpose of this application is to accurately control the mechanical stress applied to the amorphous alloy, simulate the mechanical stress scenarios that the amorphous alloy is subjected to in actual complex working conditions, and provide effective solutions for those amorphous alloy magnetic property measurement environments that need to consider mechanical stress factors, thereby successfully achieving the ultimate goal of effectively measuring the magnetic properties of amorphous alloys under different mechanical stress states.

[0006] A stress loading device for measuring magnetic properties of an amorphous alloy, comprising:

[0007] The amorphous alloy to be tested is placed in the excitation coil and connected to the loading end of the electromagnet loading part through the iron yoke;

[0008] The electromagnet loading part is used to apply stress to the amorphous alloy to be tested from both ends thereof;

[0009] The double H coil is placed inside the excitation coil. After the pressure is stabilized, the magnetic properties of the amorphous alloy can be measured by accurately measuring the magnetic flux density and magnetic field strength.

[0010] It also includes a first fixing seat, two first fixing seats are arranged opposite to each other and are used to fix the electromagnet stress loading device at both ends of the iron yoke; the first fixing seat includes an external baffle and an internal height-adjustable bracket.

[0011] The electromagnet loading part includes two electromagnet stress loading devices arranged opposite to each other, and the electromagnet stress loading device includes a sliding rod made of high magnetic permeability material, which is a soft magnetic material; the outside of the sliding rod is an electromagnet shell, which is a non-magnetic material; the sliding rod slides inside the electromagnet shell; an elastic component is arranged between the sliding rod and the electromagnet shell, which is used for automatic resetting of the sliding rod after power failure; a fixing clamp is connected to the end of the sliding rod, which is used to clamp and fix the amorphous alloy to be tested; a stress measurement unit is arranged between the fixing clamp and the sliding rod.

[0012] The end of the sliding rod is provided with a limiting device for limiting the sliding position of the sliding rod in the electromagnet housing.

[0013] The two fixing clamps of the electromagnet stress loading device clamp the amorphous alloy to be tested from both ends. When the sliding rods on both sides are energized in the forward direction, they act as the iron core to generate magnetic force and apply compressive stress to the amorphous alloy to be tested; when the sliding rods on both sides are energized in the reverse direction, they act as the iron core to generate opposite magnetic force and apply tensile stress to the amorphous alloy to be tested.

[0014] The fixing clamp comprises two upper and lower fixing parts. The two fixing clamps are located at the same height and horizontally clamp and fix the amorphous alloy to be tested.

[0015] It also includes a second fixed seat, the top of which is sunken, and the excitation coil is installed in the sunken space of the second fixed seat; the second fixed seat includes two second fixed parts arranged oppositely, the excitation coil is fixed on the second fixed parts, and the iron yoke is fixed between the two second fixed parts.

[0016] It also includes a control system and a host computer electrically connected thereto; an electromagnet loading part and a stress measuring unit are electrically connected to the control system, and pressure control is performed in a closed loop.

[0017] It also includes an anti-fracture clamp made of polyetheretherketone, which is installed in the inner cavity of the excitation coil to clamp and fix the amorphous alloy to be tested from the upper and lower sides; the double H coil is placed in a groove opened on the upper surface of the anti-fracture clamp.

[0018] A stress loading method for measuring the magnetic properties of an amorphous alloy, using the above-mentioned stress loading device for measuring the magnetic properties of an amorphous alloy, is specifically as follows:

[0019] Build a loading part, and install a stress measurement unit on the electromagnet loading part at one end;

[0020] Install and fix the excitation coil and iron yoke, install the amorphous alloy to be tested inside the excitation coil through the anti-fracture clamp, and then place the double H coil on the anti-fracture clamp;

[0021] Install the electromagnet loading part at both ends of the amorphous alloy to be tested; clamp and fix the two ends of the amorphous alloy to be tested by a fixing clamp, ensure that the height of the fixing clamp is consistent with that of the amorphous alloy sample to be tested, and keep both sides at the same horizontal plane, so as to ensure that the amorphous alloy sample to be tested remains horizontal during the insertion of the iron yoke;

[0022] electrically connecting the stress measurement unit to the control system;

[0023] The electromagnet loading part is energized, and the stress loading on the amorphous alloy sample is realized by controlling the current, and the closed-loop control adjusts the pressure value to a stable value;

[0024] The induced electromotive force under the double H coil is recorded by the data acquisition system and transmitted to the host computer.

[0025] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0026] (1) Since the prior art is to apply stress to electrical steel sheet materials, there is no experimental device for amorphous alloys. By using the device provided by the present invention, by using an anti-fracture clamp, the amorphous alloy material is prevented from breaking when stress is applied, thereby realizing the measurement of the magnetic properties of the amorphous alloy under stress conditions.

[0027] (2) The device provided by the present invention has a fast response speed. The response speed of the electromagnet drive is much faster than that of the traditional mechanical device, and it can quickly apply or release stress and reduce the hysteresis effect. Traditional devices may have mechanical delays when applying stress, affecting the accuracy of the test results. The present invention achieves the advantages of fast response, high control accuracy, good repeatability, etc. through electromagnet drive, further improving the overall performance.

[0028] (3) The device of the present invention has more precise control over mechanical stress. Through closed-loop control, the device of the present invention can accurately control the magnitude and direction of applied stress, ensuring the accuracy and reliability of the test results. Traditional devices usually rely on open-loop control, and their stress application process depends on pre-set mechanical parameters. They lack real-time feedback adjustment capabilities and are difficult to achieve high-precision stress control.

[0029] (4) The device of the present invention is easy to operate. Compared with the traditional motor mechanism, the device of the present invention has a simpler structure and is easy to operate. The structure of applying pressure on both sides can achieve a larger pressure range. Traditional devices usually require complex mechanical structures and a large space, while the present invention achieves a compact design through electromagnet drive.

[0030] (5) The device of the present invention has high measurement accuracy. When measuring the magnetic properties of amorphous alloys, commonly used methods include winding method, punching method and H coil method. However, these methods have certain limitations in practical applications. For example, the winding method requires rewinding every time the sample is replaced, which is cumbersome and inefficient; the punching method will destroy the internal structure of the amorphous alloy and introduce internal stress, thereby affecting the accuracy of the measurement results. In contrast, the double H coil method adopted in the present invention has significant advantages in many aspects. First, the double H coil method does not require rewinding when the sample is replaced, which greatly improves the measurement efficiency; second, this method avoids the damage to the structure of the amorphous alloy caused by punching, ensuring the integrity of the sample; finally, compared with the traditional H coil method, the double H coil method has higher measurement accuracy and can more accurately reflect the magnetic properties of amorphous alloys. Therefore, the double H coil method provides an efficient, non-destructive and accurate solution for measuring the magnetic properties of amorphous alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a stress loading device for measuring magnetic properties of an amorphous alloy provided in an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of each direction defined in the embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the base frame in the present invention;

[0034] Figure 4It is a structural schematic diagram of the electromagnet stress loading device in the present invention;

[0035] Figure 5 The partial structure diagram of the electromagnet stress loading device in the present invention is shown in FIG. Figure 1 ;

[0036] Figure 6 The partial structure diagram of the electromagnet stress loading device in the present invention is shown in FIG. Figure 2 ;

[0037] Figure 7 It is a schematic diagram of the structure of the fixing clip in the present invention;

[0038] Figure 8 It is a schematic diagram of the structure of the anti-fracture clip in the present invention;

[0039] Fig. 9 It is a cross-sectional view of the anti-fracture clip of the present invention fixed to the excitation coil chamber;

[0040] Fig.10 is a schematic diagram of the excitation coil in the present invention;

[0041] Fig.11 A stress control flow chart of the stress loading method for measuring magnetic properties of amorphous alloys according to the present invention;

[0042] in:

[0043] 1-base frame, 1-1-first fixed seat, 1-2-second fixed seat, 2-fixing clamp, 2-1-first fixing part, 2-2-second fixing part, 3-electromagnet stress loading device, 3-1-sliding rod, 3-2-electromagnet housing, 3-3-limiting nut, 3-4-spring, 4-excitation coil, 4-1-lower limit groove, 5-pressure sensor, 6-anti-fracture clip, 6-1-first clamping part, 6-2-second clamping part, 6-3-mounting groove of amorphous alloy to be tested. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] like Figure 1-10 As shown, a stress loading device for measuring the magnetic properties of an amorphous alloy comprises a base frame 1, wherein the base frame 1 serves as a fixed support for an upper loading device; an electromagnet loading part is provided on the base frame 1 for stress loading the amorphous alloy to be tested; the amorphous alloy to be tested is placed in an excitation coil and connected to the electromagnet loading part through an iron yoke, and is loaded by the electromagnet loading part, so as to experience the mechanical stress scenarios that the amorphous alloy is subjected to in actual complex working conditions.

[0046] In the present embodiment, a stress loading device for measuring the magnetic properties of an amorphous alloy is provided, including a base frame 1, which serves as a basic base and plays a role of fixing and supporting the upper loading device. A first fixing seat 1-1 for fixing the electromagnet loading part is arranged along the length direction on the base frame 1, and two first fixing seats 1-1 are arranged oppositely, and are used to fix the electromagnet stress loading device 3 at both ends of the iron yoke. The electromagnet loading part includes two electromagnet stress loading devices 3 arranged oppositely, and the two electromagnet stress loading devices 3 are respectively fixed on the two first fixing seats 1-1, and the iron yoke is fixed between the two electromagnet stress loading devices 3.

[0047] Preferably, the first fixing seat 1-1 includes an external baffle and an internal liftable circular bracket. The liftable circular bracket is used to install the electromagnet loading part, and the height of the liftable circular bracket is adjustable, so as to change the height of the electromagnet loading part. The external baffle is arranged outside the liftable circular bracket, and the electromagnet loading part is placed on the liftable circular bracket from above the external baffle.

[0048] The electromagnet stress loading device 3 includes a sliding rod 3-1 made of a high magnetic permeability material by an electromagnet. The sliding rod 3-1 is an iron core, made of soft magnetic material, and can be rapidly magnetized or demagnetized under the action of an external magnetic field. The outside of the sliding rod 3-1 is an electromagnet shell 3-2, which is made of non-magnetic material to reduce weight and avoid magnetic field interference. The sliding rod 3-1 slides inside the electromagnet shell 3-2, and a limit nut 3-3 is provided at the end of the sliding rod 3-1 for sliding limit of the sliding rod 3-1. A spring 3-4 is provided between the limit nut 3-3 of the sliding rod 3-1 and the electromagnet shell 3-2, which is used to realize automatic resetting of the sliding rod 3-1 after power failure. The end of the sliding rod 3-1 is connected to a fixing clamp 2 for clamping and fixing the amorphous alloy to be tested. In the loading state, a stress measurement unit is provided between the fixing clamp 2 and the sliding rod 3-1 of the electromagnet stress loading device 3 at one end of the amorphous alloy to be tested, which is used to measure the stress magnitude of the amorphous alloy to be tested in real time.

[0049] In this embodiment, the electromagnet stress loading device 3 includes a sliding rod 3-1 made of a high magnetic permeability material by an electromagnet, and the sliding rod 3-1 is an iron core, which generates magnetic force when powered. The sliding rod 3-1 is made of soft magnetic material and can be rapidly magnetized or demagnetized under the action of an external magnetic field. The outside of the sliding rod 3-1 is an electromagnet housing 3-2, which is made of non-magnetic material to reduce weight and avoid magnetic field interference. The sliding rod 3-1 is coaxially arranged inside the electromagnet housing 3-2 and slides along its axial direction. A limiting nut 3-3 is provided at the end of the sliding rod 3-1 for sliding limit of the sliding rod 3-1. Furthermore, a spring 3-4 is provided between the limiting nut 3-3 of the sliding rod 3-1 and the electromagnet housing 3-2, which is used to realize automatic resetting of the sliding rod 3-1 after power failure. The end of the sliding rod 3-1 is connected to a fixing clamp 2 for clamping and fixing the amorphous alloy to be tested. The two fixing clamps 2 of the electromagnet stress loading device 3 clamp the amorphous alloy to be tested from both ends. When the sliding rods 3-1 on both sides are energized in the forward direction, they act as the iron core to generate magnetic force and apply compressive stress to the amorphous alloy to be tested; when the sliding rods 3-1 on both sides are energized in the reverse direction, they act as the iron core to generate opposite magnetic force and apply tensile stress to the amorphous alloy to be tested. A pressure sensor 5 is arranged between the fixing clamp 2 and the sliding rod 3-1, which is used to measure the stress magnitude of the amorphous alloy to be tested in real time. The pressure sensor 5 adopts a screw pressure sensor DYMH-103, which is small in size, has high accuracy, and is widely applicable. It can support tension and pressure tests, and the working pressure is up to 300kg. When measuring the pressure on the amorphous alloy, the two ends of the screw pressure sensor 5 are respectively connected and fixed to the sliding rod 3-1 and the fixing clamp 2 to extract the pressure data on the amorphous alloy.

[0050] In this embodiment, the fixing clamp 2 includes two upper and lower fixing parts, and one end of the screw-type pressure sensor 5 is connected to the second fixing part 2-2 located below; the first fixing part 2-1 located above clamps and fixes the amorphous alloy to be tested from above the second fixing part 2-2 and locks it with bolts.

[0051] The base frame 1 is provided with a second fixing seat 1-2, and the iron core is fixed on the second fixing seat 1-2. The top of the second fixing seat 1-2 is sunken, and the excitation coil is installed in the sunken space of the second fixing seat 1-2.

[0052] In this embodiment, a second fixing seat 1-2 is provided on the base frame 1, and the iron core is fixed on the second fixing seat 1-2. A placement groove is provided on the top of the second fixing seat 1-2 to form a sunken structure; the excitation coil 4 is installed in the placement groove, and the internal cavity of the excitation coil 4 is arranged along the length direction of the base frame 1. Furthermore, in this embodiment, the second fixing seat 1-2 includes two second fixing parts 2-2 arranged opposite to each other along the width direction of the base frame 1, the excitation coil 4 is fixed on the second fixing part 2-2, and the iron yoke is fixed between the two second fixing parts 2-2.

[0053] The stress loading device for measuring the magnetic properties of amorphous alloys also includes a control system (not shown in the figure), and the electromagnet loading part and the stress measurement unit are electrically connected to the control system. The data acquisition part of the control system converts the signal of the stress sensor into a digital signal to achieve closed-loop control.

[0054] In this embodiment, the control system includes a PID pressure controller, which is used to collect the pressure data measured by the stress measurement unit and control the electromagnet stress loading device 3. The pressure sensor 5 is connected to the input end of the PID pressure controller through the data acquisition system, and the output end of the PID pressure controller is connected to the input control end of the solid-state relay. The output end of the solid-state relay is connected to the electromagnet stress loading device 3. The PID pressure controller sends an on-off signal to the solid-state relay, so that the solid-state relay can realize the on-off function, thereby realizing closed-loop control of the pressure. The PID pressure controller of this embodiment adopts a simple PID controller with a model of MIK-1300, and the solid-state relay adopts a Delixi single-phase solid-state relay with a model of CDG1-1DD / 10A. The control system also includes a host computer, and the PID pressure controller is connected to the host computer in communication, and the PID pressure controller transmits the pressure value monitored by the pressure sensor 5 to the host computer.

[0055] Furthermore, in view of the problem that amorphous alloys may break under stress conditions, the stress loading device for measuring the magnetic properties of amorphous alloys is also provided with an anti-fracture clamp 6, which is installed in the inner cavity of the excitation coil 4 to tightly fix the amorphous alloy to be measured. The anti-fracture clamp 6 is made of polyetheretherketone (PEEK). The outer surface of the anti-fracture clamp 6 is provided with a double H coil installation groove for placing the double H coil in the height direction so that the magnetic flux density and magnetic field strength can be accurately measured to achieve the measurement of the magnetic properties of the amorphous alloy. The inner surface of the excitation coil 4 is provided with a lower limit groove 4-1 that matches the anti-fracture clamp 6 to install and fix the anti-fracture clamp 6.

[0056] In this embodiment, the inner cavity of the excitation coil 4 is provided with an anti-fracture clip 6, and the material of the anti-fracture clip 6 is polyetheretherketone with excellent mechanical properties and outstanding thermal stability. The performance and production process of polyetheretherketone meet environmental protection requirements, and due to its long service life and high thermal conversion rate, it is very consistent with the concept of sustainable development. The anti-fracture clip 6 is the same length as the inner cavity of the excitation coil 4. The anti-fracture clip 6 includes two upper and lower clamping parts, wherein the upper surface of the first clamping part 6-1 located at the top is provided with a double H coil installation groove for placing the double H coil so as to accurately measure the magnetic flux density and magnetic field strength; the lower surface of the first clamping part 6-1 away from the double H coil installation groove is provided with a full-length amorphous alloy installation groove 6-3 to be tested, which cooperates with the second clamping part 6-2 located at the bottom to tightly fit and fix the amorphous alloy to be tested. The inner surface of the excitation coil 4 is provided with a through-length lower limit groove 4-1 which matches with the second clamping part 6-2. The second clamping part 6-2 is installed and fixed in the lower limit groove 4-1 to limit and fix in the height direction, thereby tightly fixing the amorphous alloy to be tested.

[0057] The stress loading device for measuring the magnetic properties of amorphous alloys also includes a data acquisition system (not shown in the figure), the double H coil is electrically connected to the data acquisition system, and the output end of the data acquisition system is electrically connected to the host computer through an amplifier to receive and record the induced electromotive force under the double H coil.

[0058] This embodiment realizes the detachable fixation of the base frame, the anti-fracture clamp 6, the electromagnet stress loading device 3, and the excitation coil 4.

[0059] The stress loading device for measuring the magnetic properties of amorphous alloys provided in this embodiment is used to measure the magnetic properties of amorphous alloys under stress conditions. It adopts a closed-loop feedback structure with initialization, target setting, pressure measurement feedback, PID calculation, current regulation, and stability judgment as the core. It automatically returns to the real-time measurement link when the pressure is not stable, and enters the magnetic property measurement link after stabilization. Specifically, the method of stress loading using the above-mentioned stress loading device for measuring the magnetic properties of amorphous alloys has the following core ideas: first, the anti-fracture clamp 6 is used to clamp the amorphous alloy to be measured to prevent the amorphous alloy from breaking and shattering during the measurement process, which would make the experiment unable to continue; second, two electromagnet pressure loading devices are used to apply pressure to the amorphous alloy sample to be measured; at the same time, a PID pressure controller and a solid-state relay are used to form a closed-loop control of the electromagnet pressure loading device; finally, the magnetic properties of the amorphous alloy under stress conditions are measured through a double H coil and uploaded to the host computer for storage. Combined with Fig.11 As shown, the specific steps include:

[0060] Step 1: Build the loading part, and install the pressure sensor 5 on the slide bar of the electromagnet pressure loading device on one side;

[0061] Step 2: Install the excitation coil 4 and the iron yoke on the second fixing seat 1-2, place the second clamping part 6-2 of the anti-fracture clamp 6 in the inner cavity of the excitation coil 4, and limit and fix it through the lower limit groove 4-1 inside the excitation coil 4; insert the amorphous alloy sample to be tested into the inner cavity of the excitation coil 4, and install the first clamping part 6-1 of the anti-fracture clamp 6 on the upper side of the amorphous alloy sample to be tested to clamp it; then place the double H coil in the double H coil installation groove on the upper surface of the anti-fracture clamp 6;

[0062] Step: 3: Install the electromagnet pressure loading devices on both sides on the first fixed seat 1-1 of the base frame 1; install the fixing clamps 2 for fixing the amorphous alloy sample to be tested on the electromagnet pressure loading devices on both sides respectively, ensure that the height of the fixing clamp 2 is consistent with that of the amorphous alloy sample to be tested, and keep both sides in the same horizontal plane to ensure that the amorphous alloy sample to be tested remains horizontal during the insertion of the iron yoke.

[0063] Step 3: Connect the connection end of the pressure sensor 5 to the input end of the PID pressure controller, connect the output end of the PID pressure controller to the input control end of the solid-state relay, and connect the output controlled end of the solid-state relay to the electromagnet pressure loading device;

[0064] The DC power supply that supplies power to the solid-state relay and the electromagnet pressure loading device has its positive pole connected to one end of the output controlled end of each solid-state relay, and its negative pole is connected to the electromagnet pressure loading device respectively, thereby forming a fixed pressure control loop consisting of the DC power supply, the solid-state relay and the electromagnet pressure loading device.

[0065] Step 4: Before using the electromagnet pressure loading device to load pressure on the amorphous alloy sample to be tested, first set the corresponding target pressure value of the amorphous alloy sample to be tested on the PID pressure controller. The magnitude of the stress applied is determined according to the stress range to which the amorphous alloy is subjected under actual working conditions. Then, the electromagnet pressure loading device and the pressure sensor 5 are powered on, and the electromagnet pressure loading device is used to load pressure on the amorphous alloy sample to be tested. At the same time, the pressure data of the amorphous alloy sample to be tested is measured by the pressure sensor 5, and the PID pressure controller collects the pressure data measured by the pressure sensor 5 in real time;

[0066] Step 5: The stress sensor uploads the collected stress size to the host computer in real time; the host computer forms a separate closed-loop control with the PID stress control device based on the received data: when the pressure data collected by the PID pressure controller is higher than its preset target pressure value, the PID pressure controller indirectly reduces the current through the solid-state relay power switch function connected to it, with the help of pulse width modulation technology (PWM), and controls the electromagnetic iron stress loading device 3 connected to it through the solid-state relay to stop applying pressure to the corresponding area of ​​the object to be measured; when the pressure data collected by the PID pressure controller is lower than the preset range of the preset target pressure value, the PID pressure controller indirectly increases the current through the solid-state relay power switch function connected to it, with the help of pulse width modulation technology (PWM), and controls the electromagnetic iron stress loading device 3 connected to it through the solid-state relay to continue applying pressure to the corresponding area of ​​the object to be measured.

[0067] It can be seen that this embodiment uses the PID pressure controller and the solid-state relay to form a separate closed-loop control for the electromagnet pressure loading device to maintain a fixed pressure on the amorphous alloy to be tested, thereby achieving different stress requirements for the amorphous alloy to be tested.

[0068] Step 6: Use the data acquisition system to record the induced electromotive force under the double H coil and transmit it to the host computer through the amplifier. The host computer records it through the LABVIEW program.

Claims

1. A stress loading device for measuring magnetic properties of amorphous alloys, characterized in that: include: The amorphous alloy to be tested is placed in the excitation coil and connected to the loading end of the electromagnet loading part through the iron yoke; The electromagnet loading part is used to apply stress to the amorphous alloy to be tested from both ends thereof; The double H coil is placed inside the excitation coil. After the pressure is stabilized, the magnetic properties of the amorphous alloy can be measured by accurately measuring the magnetic flux density and magnetic field strength.

2. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 1, characterized in that: It also includes a first fixing seat, two first fixing seats are arranged opposite to each other and are used to fix the electromagnet stress loading device at both ends of the iron yoke; the first fixing seat includes an external baffle and an internal height-adjustable bracket.

3. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 1, characterized in that: The electromagnet loading part includes two electromagnet stress loading devices arranged opposite to each other, and the electromagnet stress loading device includes a sliding rod made of high magnetic permeability material, which is a soft magnetic material; the outside of the sliding rod is an electromagnet shell, which is a non-magnetic material; the sliding rod slides inside the electromagnet shell; an elastic component is arranged between the sliding rod and the electromagnet shell, which is used for automatic resetting of the sliding rod after power failure; a fixing clamp is connected to the end of the sliding rod, which is used to clamp and fix the amorphous alloy to be tested; a stress measurement unit is arranged between the fixing clamp and the sliding rod.

4. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 3, characterized in that: The end of the sliding rod is provided with a limiting device for limiting the sliding position of the sliding rod in the electromagnet housing.

5. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 3, characterized in that: The two fixing clamps of the electromagnet stress loading device clamp the amorphous alloy to be tested from both ends. When the sliding rods on both sides are energized in the forward direction, they act as the iron core to generate magnetic force and apply compressive stress to the amorphous alloy to be tested; when the sliding rods on both sides are energized in the reverse direction, they act as the iron core to generate opposite magnetic force and apply tensile stress to the amorphous alloy to be tested.

6. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 3, characterized in that: The fixing clamp comprises two upper and lower fixing parts. The two fixing clamps are located at the same height and horizontally clamp and fix the amorphous alloy to be tested.

7. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 1, characterized in that: It also includes a second fixed seat, the top of which is sunken, and the excitation coil is installed in the sunken space of the second fixed seat; the second fixed seat includes two second fixed parts arranged oppositely, the excitation coil is fixed on the second fixed parts, and the iron yoke is fixed between the two second fixed parts.

8. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 3, characterized in that: It also includes a control system and a host computer electrically connected thereto; an electromagnet loading part and a stress measuring unit are electrically connected to the control system, and pressure control is performed in a closed loop.

9. A stress loading device for measuring magnetic properties of amorphous alloys according to claim 1, characterized in that: It also includes an anti-fracture clamp made of polyetheretherketone, which is installed in the inner cavity of the excitation coil to clamp and fix the amorphous alloy to be tested from the upper and lower sides; the double H coil is placed in a groove opened on the upper surface of the anti-fracture clamp.

10. A stress loading method for measuring magnetic properties of an amorphous alloy, using a stress loading device for measuring magnetic properties of an amorphous alloy according to any one of claims 1 to 9, characterized in that: The details are as follows: Build a loading part, and install a stress measurement unit on the electromagnet loading part at one end; Install and fix the excitation coil and iron yoke, install the amorphous alloy to be tested inside the excitation coil through the anti-fracture clamp, and then place the double H coil on the anti-fracture clamp; Install the electromagnet loading part at both ends of the amorphous alloy to be tested; clamp and fix the two ends of the amorphous alloy to be tested by a fixing clamp, ensure that the height of the fixing clamp is consistent with that of the amorphous alloy sample to be tested, and keep both sides at the same horizontal plane, so as to ensure that the amorphous alloy sample to be tested remains horizontal during the insertion of the iron yoke; electrically connecting the stress measurement unit to the control system; The electromagnet loading part is energized, and the stress loading on the amorphous alloy sample is realized by controlling the current, and the closed-loop control adjusts the pressure value to a stable value; The induced electromotive force under the double H coil is recorded by the data acquisition system and transmitted to the host computer.

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