Magnetic defect detector

Abstract

The utility model relates to the technical field of physical and chemical inspection, and particularly discloses a magnetic defect detector which comprises an input end, a primary pressing circuit module and an output end, the input end is electrically connected with one end of the primary pressing circuit module, and the other end of the primary pressing circuit module is electrically connected with the output end; wherein the primary pressing circuit module comprises a first capacitor; the one-time pressing circuit module is used for achieving one-time pressing automatic magnetization time of at least three seconds. According to the utility model, the problem of detection leakage caused by insufficient magnetization conduction time can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of physical and chemical inspection technology, in particular to a magnetic particle flaw detector. BACKGROUND

[0002] The magnetic particle flaw detection technology can be used for the flaw detection of various material surfaces, such as welding defects, surface cracks, fatigue cracks, pores, thermal cracks, tensile pores and interlayers. In particular, the magnetic particle flaw detection technology has wide application value in the flaw detection of the surfaces of high-strength materials. The basic principle of the magnetic particle flaw detector is to detect the defects on the surface or near the surface of a material by using the reaction of the defects in the material to the magnetic field. The instrument is mainly suitable for generating a magnetic field to magnetize the detected object, so that the leakage magnetic field at the defects can attract magnetic powder, thereby displaying the position and shape of the defects. The magnetic particle flaw detector is mainly used in the quality detection of magnetically conductive metal products, welds, castings and forgings.

[0003] In the prior art, the current magnetic particle flaw detector control mode adopts point control, that is, the power is turned on by pressing the finger and turned off by releasing the finger. According to the current flaw detection process requirements, the magnetization power-on time is greater than 3 seconds, which can only rely on the detection operator to estimate the magnetization power-on time. This not only easily leads to the problem of missed detection due to insufficient magnetization power-on time of the workpiece, but also when the detection amount is large, the work load of a day may need to press hundreds of times, which increases the labor burden of the detection operator. CONTENT OF THE UTILITY MODEL

[0004] To solve the problem of missed detection due to insufficient magnetization power-on time of the workpiece. The embodiment provides a magnetic particle flaw detector, which comprises an input end, a one-time pressing circuit module and an output end; the input end is electrically connected to one end of the one-time pressing circuit module, and the other end of the one-time pressing circuit module is electrically connected to the output end; wherein the one-time pressing circuit module comprises a first capacitor; the one-time pressing circuit module is used to realize a one-time pressing automatic magnetization time of 3-5 seconds; the input end and the first capacitor are connected in parallel; the magnetic particle flaw detector further comprises an amplification circuit module, one end of the one-time pressing circuit module is electrically connected to one end of the amplification circuit module, and the other end of the amplification circuit module is electrically connected to the output end; the output end comprises an output voltage source and a transformer; one end of the output voltage source is electrically connected to the amplification module, and the other end is electrically connected to the transformer.

[0005] Beneficial effects: first, by designing the first capacitor in the one-time pressing circuit, the magnetic particle flaw detector device can automatically maintain the magnetization state for 3 seconds after one-time pressing, which ensures that the magnetization time meets the process requirements and avoids the problem of missed detection due to insufficient time.

[0006] Secondly, the magnetic particle flaw detector device can automatically complete the 3-second magnetization operation without continuous pressing. This not only reduces the hand burden of the detection operator, but also improves the work efficiency and reduces the operation errors caused by fatigue.

[0007] And, the frequency of button use is reduced, and the wear of components is reduced. At the same time, the stable magnetization time avoids additional stress on the device due to improper operation, thereby prolonging the service life of the device and reducing the maintenance cost of the device.

[0008] At the same time, the delay function is realized by adding a capacitor (first capacitor) in the circuit, the modification cost is low, and the original device structure does not need to be greatly changed. This simple and effective improvement method is economical and practical, and is suitable for upgrading on existing devices.

[0009] Then, the one-time pressing automatic magnetization function ensures the stability and consistency of the magnetization time each time, avoids the missed detection or misjudgment caused by inaccurate time estimation, and thereby improves the accuracy and reliability of the detection result, providing more reliable protection for product quality detection.

[0010] Finally, the device automatically stops magnetization after 3-5 seconds, avoiding the problem of excessive magnetic field strength caused by continuous pressing, thereby improving the safety of the device and protecting the safety of the detector and the detected object

[0011] Preferably, the capacitance value of the first capacitor is 1000 μF.

[0012] Beneficial effects: The capacitance value of 1000 μF can effectively meet the requirements of the magnetic time of the detection process, avoid the missed detection problem caused by insufficient magnetization time, and also will not cause unnecessary damage to the detected object or the device due to too long magnetization time. The selection of this capacitance value not only ensures the performance of the device, but also optimizes the operating efficiency and safety of the device, providing reliable technical support for detection work.

[0013] Preferably, the amplification circuit module comprises a first resistor, a first transistor, a second transistor, a second resistor, a first diode, a second diode, a third resistor, a third diode, a fourth resistor, and a second capacitor; the base of the first transistor is electrically connected with one end of the first resistor, the collector of the first transistor is electrically connected with the negative electrode of the first diode, and the emitter of the first transistor is electrically connected with one end of the second resistor; the base of the second transistor is electrically connected with the emitter of the first transistor and one end of the second resistor respectively; the emitter of the second transistor is electrically connected with the one-press circuit module; the collector of the second transistor is electrically connected with the base of the first transistor and one end of the first resistor respectively; the positive electrode of the first diode is electrically connected with the one-press circuit module and the other end of the first resistor respectively, and the first diode is connected with the second diode; one end of the second diode is electrically connected with the output end, one end of the third diode, and one end of the fourth resistor respectively, the other end of the second diode is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with the other end of the third diode; the other end of the fourth resistor is electrically connected with one end of the second capacitor, and the other end of the second capacitor is electrically connected with the other end of the third diode and the output end respectively.

[0014] Beneficial effects: First, by designing the one-press circuit module and adding a first capacitor, the magnetic particle detector device can automatically maintain the magnetized state for 3 seconds after one press, ensuring that the magnetization time meets the process requirements and avoiding missed detection due to insufficient time.

[0015] Secondly, the magnetic particle detector device can automatically complete the 3-second magnetization operation without the need for continuous pressing. This not only reduces the hand burden of the detector, but also improves the work efficiency and reduces the operation errors caused by fatigue.

[0016] Moreover, through the design of the one-press circuit module, the frequency of using the button is reduced, and the wear of the components is reduced. At the same time, the stable magnetization time avoids additional pressure on the device due to improper operation, thereby prolonging the service life of the device and reducing the maintenance cost of the device.

[0017] At the same time, by adding a capacitor (first capacitor) in the circuit to realize the delay function, the modification cost is low, and no large-scale modification of the original device structure is needed. This simple and effective improvement method is economical and practical, and is suitable for upgrading on existing devices.

[0018] Then, the one-press automatic magnetization function ensures the stability and consistency of the magnetization time each time, avoids missed detection or misjudgment due to inaccurate time estimation, and thus improves the accuracy and reliability of the detection results, providing more reliable protection for the detection of product quality.

[0019] Then, by pressing the circuit module design, the device is automatically stopped magnetization after 3 seconds, avoiding the problem of high magnetic field strength caused by continuous pressing, thereby improving the safety of the device and protecting the safety of the inspector and the detected object.

[0020] Finally, the design of this one-time pressing automatic magnetization function is simple, low-cost, and easy to modify and upgrade on existing devices, suitable for popularization and application in various magnetic particle flaw detectors, with high practical value and market prospect.

[0021] Preferably, the first diode and the second diode form an optical coupler.

[0022] Beneficial effects: First, the optical coupler realizes electrical isolation between the input and output through optical signal transmission. The optical coupler composed of the first diode and the second diode uses optical signal to transmit control signals, avoiding direct electrical connection between the input and output, thereby effectively isolating the interference signals of the input and improving the anti-interference ability of the device.

[0023] Second, the optical coupler transmits signals through optical signals and is not affected by electromagnetic interference. The optical coupler composed of the first diode and the second diode can convert input signals into optical signals, and then transmit control signals to the output through optical signals, thereby ensuring the stability and reliability of signal transmission, and ensuring normal work even in a strong electromagnetic interference environment.

[0024] Moreover, the electrical isolation characteristics of the optical coupler can effectively protect the circuit elements. Since there is no direct electrical connection between the input and output, even if the input end is subjected to high voltage or large current impact, it will not be directly transmitted to the output, thereby protecting the circuit elements of the output and prolonging the service life of the device.

[0025] Then, the input end of the optical coupler only needs a small current to drive the light-emitting diode (the first diode), thereby realizing control of the output end. This low-power control method not only saves energy, but also improves the response speed of the control signal, so that the device can respond to the input signal more quickly.

[0026] At the same time, the electrical isolation characteristics of the optical coupler can effectively prevent high voltage or current leakage. By transmitting control signals through optical signals, even if the input end fails, it will not cause direct electrical danger to the operator or the device, thereby improving the safety of the device.

[0027] Then, the optical coupler has good adaptability. By selecting appropriate optical coupler models, it can adapt to different input and output signal ranges, so that the device can work stably in various application scenarios.

[0028] Finally, the use of optical couplers makes the circuit structure more clear, easy to maintain and debug. In the event of a fault, the problem can be quickly located by checking the working state of the optical coupler, thereby improving the maintenance efficiency of the equipment.

[0029] Preferably, the output voltage source is used to output a voltage of 220V, which is converted to a voltage of 12V after the transformer.

[0030] Beneficial effects: First, the input voltage of 220V is converted to an output voltage of 12V by the transformer, providing a suitable working voltage for the low-voltage circuit modules inside the device. This ensures that each module inside the device can operate at an appropriate voltage, improving the overall compatibility and stability of the device.

[0031] Second, the high voltage of 220V is converted to a low voltage of 12V by the transformer, reducing the working voltage of the internal circuit of the device, thereby reducing the risk of electric shock and the possibility of circuit damage. This improves the safety of the device, protecting the personal safety of the operator and the safety of the internal circuit of the device.

[0032] At the same time, the input voltage of 220V is converted to a stable output voltage of 12V by the transformer, providing a stable power supply for the internal circuit of the device. This ensures that the device can maintain a stable magnetic field strength and control signal during operation, improving the accuracy and reliability of detection.

[0033] Subsequently, the input voltage of 220V is converted to an output voltage of 12V by the transformer, reducing the working voltage of the internal circuit of the device, thereby reducing power consumption. This reduces the operating cost of the device and improves the energy efficiency ratio of the device.

[0034] Then, the input voltage of 220V is converted to an output voltage of 12V by the transformer, reducing the working voltage of the internal circuit of the device, reducing the voltage stress of components, and thereby improving the reliability of the device.

[0035] Moreover, by designing the transformer and output voltage source as independent modules, the circuit structure of the device is more clear, easy to maintain and upgrade. This improves the maintainability and scalability of the device, making it easier to replace or optimize related modules in future upgrades.

[0036] Finally, the voltage conversion is achieved by the transformer, simplifying the power supply design and reducing the complexity of the power management circuit. This reduces the overall design cost of the device and improves its reliability. It also prolongs the service life of the device and reduces the frequency of maintenance and replacement of components.

[0037] Preferably, the input end is a silicon-controlled solid-state relay.

[0038] Beneficial effects: using the silicon controlled solid state relay as the input end has the beneficial effects of realizing fast, non-mechanical wear switching operation, fast response speed and high reliability, effectively avoiding the problems of poor contact or shortened service life of traditional mechanical relays caused by frequent operation, and having the characteristics of low noise and low electromagnetic interference, which can work stably in complex industrial environments and ensure the accurate and efficient transmission of the control signal of the magnetic particle detector, thereby improving the overall performance and service life of the equipment.

[0039] Preferably, the silicon controlled solid state relay normally works within a direct current voltage of 3V-24V.

[0040] Beneficial effects: the silicon controlled solid state relay normally works within a direct current voltage of 3V-24V, which makes the magnetic particle detector adapt to a wider input voltage range, enhances the versatility and flexibility of the equipment, ensures stability and reliability under different voltage conditions, reduces the risk of equipment failure caused by voltage fluctuation or mismatch, and improves the overall performance and service life of the equipment.

[0041] Beneficial effects of the utility model

[0042] Compared with the prior art, first, by adopting the one-press circuit module, one-press can be realized, and the magnetization power-on time is 3-5s, which not only solves the problems of no need for manual continuous pressing and mental calculation of pressing time, but also reduces the damage to the components of the magnetic particle detector, prolongs the service life of the magnetic particle detector, and prevents the magnetization power-on time from being less than 3s and causing missed filling. By adopting the one-press circuit module, one-press can be realized, and the magnetization power-on time is 3-5s, which not only reduces the fatigue of the fingers of the detector during detection, but also protects the health of the detector, and prolongs the service life of the magnetic particle detector.

[0043] Secondly, by arranging the first capacitor with a capacitance value of 1000pF in parallel at the input end, the cost is low, the original structure of the magnetic particle detector does not need to be changed, and only one first capacitor with a capacitance value of 1000pF needs to be added to change the resistance-capacitance ratio of the circuit and the rising and falling edge time of the output signal, thereby realizing the delay function of the solid state relay. Compared with other devices that may realize one-press by adding a delay relay, the cost of modification is high, the original device structure may need to be changed, and the first capacitor is practical and simple, and has a longer service life.

[0044] Finally, by adding the amplification module, the magnetization intensity can be increased to avoid the situation of missing detection. Moreover, combined with the first capacitor, the magnetization power supply is 3-5 seconds, which ensures that the service life of the magnetic particle flaw detector is not reduced, and the magnetic particle flaw detector can be stably operated. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A circuit structure schematic diagram of a magnetic particle flaw detector of the embodiment. DETAILED DESCRIPTION

[0046] The reference signs in the drawings of the specification include:

[0047] The input end IN, the first capacitor C1, the second capacitor C2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, the third diode D3, and the transformer T.

[0048] EMBODIMENT

[0049] The embodiment provides a magnetic particle flaw detector which comprises an input end, a one-time pressing circuit module, and an output end; one end of the input end is electrically connected with the one-time pressing circuit module, and the other end of the one-time pressing circuit module is electrically connected with the output end; wherein the one-time pressing circuit module comprises a first capacitor; the one-time pressing circuit module is used for realizing that the one-time pressing automatic magnetization time is 3-5 seconds. Wherein the input end IN and the first capacitor C1 are connected in parallel. In the embodiment, the capacitance value of the first capacitor is 1000 μF. The magnetic particle flaw detector further comprises an amplification circuit module, one end of the one-time pressing circuit module is electrically connected with one end of the amplification circuit module, and the other end of the amplification circuit module is electrically connected with the output end. The amplification circuit module comprises a first resistor, a first triode, a second triode, a second resistor, a first diode, a second diode, a third resistor, a third diode, a fourth resistor, and a second capacitor.

[0050] The embodiment provides a magnetic particle flaw detector which comprises an input end, a one-time pressing circuit module, and an output end; one end of the input end is electrically connected with the one-time pressing circuit module, and the other end of the one-time pressing circuit module is electrically connected with the output end; wherein the one-time pressing circuit module comprises a first capacitor; the one-time pressing circuit module is used for realizing that the one-time pressing automatic magnetization time is 3-5 seconds. Wherein the input end IN and the first capacitor C1 are connected in parallel. In the embodiment, the capacitance value of the first capacitor is 1000 μF. The magnetic particle flaw detector further comprises an amplification circuit module, one end of the one-time pressing circuit module is electrically connected with one end of the amplification circuit module, and the other end of the amplification circuit module is electrically connected with the output end. The amplification circuit module comprises a first resistor, a first triode, a second triode, a second resistor, a first diode, a second diode, a third resistor, a third diode, a fourth resistor, and a second capacitor.

[0051] Specifically, as Figure 1As shown, the positive pole of the input end IN is electrically connected with the upper end of the first capacitor C1, the first resistor R1 and the first diode D1 respectively. The negative pole of the input end IN is electrically connected with the lower end of the first capacitor C1 and the second resistor R2 respectively, and is also electrically connected with the emitter of the second triode Q2. The lower end of the first resistor R1 is electrically connected with the collector of the second triode Q2 and the base of the first triode Q1 respectively. The upper end of the second resistor R2 is electrically connected with the base of the second triode Q2. The lower end (negative pole) of the first diode D1 is electrically connected with the collector of the first triode Q1. The first diode D1 and the second diode D2 are connected, and the first diode D1 and the second diode D2 constitute a light coupling device of MOC3063 type. The upper end of the second diode D2, the third diode D3 and the fourth resistor R4 is electrically connected with the first output end of 220V voltage respectively. The lower end of the second diode D2 is electrically connected with the third resistor R3, and the third resistor R3 is electrically connected with the lower end of the third diode D3. The lower end of the fourth resistor R4 is electrically connected with the upper end of the second capacitor C2, and the lower end of the second capacitor C2 and the third diode D3 are both electrically connected with the left end of the transformer T. The second output end of 220V voltage is electrically connected with the right end of the transformer T.

[0052] The output end includes an output voltage source and a transformer; one end of the output voltage source is electrically connected with the amplification module, and the other end is electrically connected with the transformer. The output voltage source is used to output 220V voltage, which is converted into 12V voltage after passing through the transformer. The input end is a silicon controlled solid-state relay. The silicon controlled solid-state relay normally works in the direct current voltage of 3V-24V.

[0053] In the embodiment, the resistance value of the first resistor R1 is 6.8KΩ, and the resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4 are 47Ω. The model of the third diode is BT136. The capacitance value of the second capacitor C2 is 0.01μF / 400V.

[0054] Test example

[0055] In the test example, by setting the first capacitor C1 with different capacitance values, it is explored that how long the magnetic particle flaw detector can be automatically magnetized by pressing the start button once.

[0056] Table 1: Test of automatic magnetization time based on the first capacitor with different capacitance values

[0057]

[0058] As shown in Table 1, the capacitance value of 1000μF can be used as the related components of the one-press circuit module of the magnetic particle flaw detector of the embodiment.

[0059] The incorporation of a polar capacitor (first capacitor) at the input end (DC3V-24V) of a silicon-controlled solid-state relay (SSR) can change the resistance-capacitance ratio of the circuit, thereby changing the rising and falling edge times of the output signal, achieving the delay function of the solid-state relay. Through experiments, incorporating a 470UF capacitor delays for 2 seconds, incorporating a 1000UF capacitor delays for 3.5 seconds, and incorporating a 2000UF capacitor delays for 6 seconds. Finally, 1000UF is selected. After the modification, the effect is: press the button once, release the finger, and automatically magnetize for 3.5 seconds; solve the problem of not needing to press the finger all the time, and ensure the reliability of the execution process.

[0060] The beneficial effects of the test example

[0061] Firstly, by setting different capacitance values of the first capacitor and testing the corresponding automatic magnetization time, the test example directly verifies whether the design of the one-press circuit module can achieve the expected magnetization time function. For example, the test results in Table 1 show that when the capacitance value of the first capacitor is 1000μF, the automatic magnetization time is 3.5 seconds, which is highly consistent with the design target of 35 seconds of magnetization time, thereby proving that the first embodiment is feasible.

[0062] Secondly, the test example helps to determine the most suitable capacitance value by comparing the magnetization time under different capacitance values. In the first embodiment, the capacitance value of 1000μF is selected as the relevant component of the one-press circuit module, and this selection is based on the optimization results of the test results. Through testing, blind selection of parameters can be avoided, and the device can achieve the best performance in actual application.

[0063] Moreover, by accurately measuring the magnetization time under different capacitance values, it ensures that the magnetic particle detector can stably achieve the expected magnetization time in actual use. This stability is crucial for the accuracy and reliability of the detection results. For example, if the magnetization time is unstable or inaccurate, it may lead to missed detection or false positives, and the device optimized through testing can effectively avoid these problems.

[0064] At the same time, through test verification, selecting the appropriate capacitance value can ensure that the device can operate stably under different working conditions, thereby reducing the risk of device failure caused by unreasonable design. For example, if the capacitance value is too large or too small, it may cause the magnetization time to be too long or too short, thereby affecting the performance and service life of the device. The parameters optimized through testing can effectively avoid these problems.

[0065] Finally, it provides important data support for possible future device improvements. If further optimization of device performance is needed in the future, such as adjusting the magnetization time range or improving the response speed of the device, these test data can serve as a reference basis to help engineers quickly find the direction and method of improvement.

[0066] In the description of the utility model, it needs to explain, the term "upper", "lower", "left", "right" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or is the orientation or position relation of the utility model product when using the usual place, only is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element that the indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the restriction of the utility model.

[0067] In the description of the utility model, it also needs to explain, unless another explicit provision and limitation, the term "set", "installation", "connect", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral connection, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For the ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning in the utility model according to the specific circumstances.

[0068] It should be understood that the term "and / or" used herein is only a description of the same field of associated objects, indicating that there can be three kinds of relationships, for example, A and / or B, can indicate: A exists alone, A and B exist simultaneously, B exists alone.Three cases.In addition, the character " / " in this paper generally indicates that the front and rear associated objects are a kind of "or" relationship.

[0069] Although the subject matter has been described in terms of specific structural features and / or method logical actions, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely exemplary forms of implementing the claims.

[0070] The above-mentioned is only the embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail, the ordinary skilled person in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, the ordinary skilled person in the art can improve and implement the present scheme under the enlightenment given in the present application, and some typical known structures or known methods should not become an obstacle for the ordinary skilled person in the art to implement the present application. It should be pointed out that for the skilled person in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A magnetic particle flaw detector, characterized by comprising: The input end, the one-time pressing circuit module and the output end are connected in series; the input end is connected with one end of the one-time pressing circuit module, and the other end of the one-time pressing circuit module is connected with the output end; wherein the one-time pressing circuit module comprises a first capacitor; the one-time pressing circuit module is used for realizing that the one-time pressing automatic magnetization time is 3-5 seconds; the input end and the first capacitor are connected in parallel; The amplification circuit module is further included, one end of the one-time pressing circuit module is connected with the amplification circuit module, and the other end of the amplification circuit module is connected with the output end; The output end comprises an output voltage source and a transformer; one end of the output voltage source is connected with the amplification module, and the other end of the output voltage source is connected with the transformer.

2. The magnetic particle instrument according to claim 1, wherein The capacitance of the first capacitor is 1000 μF.

3. The magnetic particle instrument of claim 1 wherein, The amplification circuit module comprises a first resistor, a first triode, a second triode, a second resistor, a first diode, a second diode, a third resistor, a third diode, a fourth resistor and a second capacitor; The base of the first triode is connected with one end of the first resistor, the collector of the first triode is connected with the negative electrode of the first diode, and the emitter of the first triode is connected with one end of the second resistor; The base of the second triode is connected with the emitter of the first triode and one end of the second resistor respectively; the emitter of the second triode is connected with the one-time pressing circuit module; the collector of the second triode is connected with the base of the first triode and one end of the first resistor respectively; The positive electrode of the first diode is connected with the one-time pressing circuit module and the other end of the first resistor respectively, the first diode is connected with the second diode; one end of the second diode is connected with the output end, the third diode and one end of the fourth resistor respectively, the other end of the second diode is connected with one end of the third resistor, the other end of the third resistor is connected with the other end of the third diode; the other end of the fourth resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the other end of the third diode and the output end respectively.

4. The magnetic particle instrument of claim 1 wherein, The output voltage source is used for outputting 220V voltage, which is converted into 12V voltage after passing through the transformer.

5. The magnetic particle instrument of claim 3 wherein, The first diode and the second diode constitute an optical coupler.

6. The magnetic particle instrument of claim 1 wherein, The input end is a silicon controlled solid-state relay.

7. The magnetic particle instrument of claim 1 wherein, The silicon controlled solid-state relay normally works in the direct current voltage of 3V-24V.

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