Integrated alternating current-direct current conversion magnetic defect detector

Abstract

The utility model discloses an integrated alternating current-direct current conversion magnetic defect detector which comprises an input module, a boosting module and a modulation module, and the input module is used for providing direct current voltage input for a system; the boosting module is electrically connected to the input module and is used for boosting the input direct-current voltage to form high-voltage direct-current voltage; the modulation module is electrically connected to the boosting module and used for converting the high-voltage direct-current voltage into alternating-current voltage and outputting the alternating-current voltage. According to the technical scheme provided by the utility model, the magnetic defect detector can be switched between a direct current mode and an alternating current mode, a workpiece can be comprehensively and carefully detected, the detection is more convenient, and a large amount of detection time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic particle flaw detectors, in particular to an integrated AC / DC conversion magnetic particle flaw detector. Background Art

[0002] A magnetic particle flaw detector is a device used to detect surface and near-surface defects of metal workpieces. It uses magnetic particle detection technology to generate a magnetic field on the metal surface and apply magnetic particles to discover and display defects such as cracks, inclusions, and pores on the object being tested, thereby performing quality assessment and inspection.

[0003] At present, the magnetic particle flaw detectors on the market are mainly divided into DC flaw detectors and AC flaw detectors. DC flaw detectors have strong deep-buried defect detection capabilities and can detect deeper cracks; while AC flaw detectors have a skin effect and are more sensitive to surface and near-surface defect detection. When inspecting workpieces, it is often necessary to use both DC flaw detectors and AC flaw detectors to detect surface defects and deep-buried defects of the workpiece. The inspection process is relatively lengthy and troublesome. Utility Model Content

[0004] The main purpose of the utility model is to provide an integrated AC / DC conversion magnetic particle flaw detector, which aims to be able to convert the power supply of the magnetic particle flaw detector from a DC mode to an AC mode, so that the magnetic particle flaw detector can perform both DC flaw detection and AC flaw detection, which is more convenient and saves a lot of detection time.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes an integrated AC / DC conversion magnetic particle flaw detector, comprising:

[0006] An input module, used to provide a DC voltage input for the system;

[0007] A boost module, electrically connected to the input module, for boosting the input DC voltage to form a high-voltage DC voltage;

[0008] The modulation module is electrically connected to the boost module and is used to convert the high-voltage direct current voltage into an alternating current voltage and output it.

[0009] In one embodiment of the present invention, the boost module comprises:

[0010] A high-frequency inverter circuit, electrically connected to the input module, for inverting the DC voltage provided by the input module into high-frequency low-voltage pulses;

[0011] The rectifier is electrically connected to the high-frequency inverter circuit and is used to convert the high-frequency low-voltage pulses into a high-voltage direct current voltage.

[0012] In one embodiment of the utility model, a high-frequency MOSFET switch tube is electrically connected in the high-frequency inverter circuit, and the high-frequency MOSFET switch tube has a high-frequency switching rate to convert the DC voltage into a high-frequency low-voltage pulse.

[0013] In one embodiment of the present invention, the rectifier comprises:

[0014] A transformer, electrically connected to the high-frequency inverter circuit, for boosting the high-frequency low-voltage pulse provided by the high-frequency inverter circuit to form a high-voltage pulse;

[0015] A rectifier circuit, electrically connected to the transformer, for converting high-voltage pulses into high-voltage direct current voltage;

[0016] The first filter circuit is electrically connected to the rectifier circuit and is used to filter out the AC signal in the high voltage DC voltage and retain its DC signal.

[0017] In one embodiment of the present invention, the modulation module includes:

[0018] An SPWM modulation circuit, electrically connected to the rectifier, for modulating the high-voltage DC voltage output by the rectifier into a low-frequency AC voltage;

[0019] The second filtering circuit is electrically connected to the SPWM modulation circuit and is used for filtering out the high-frequency signal in the low-frequency AC voltage and retaining the low-frequency signal.

[0020] In an embodiment of the present invention, the frequency of the low-frequency AC voltage is 50 Hz.

[0021] In an embodiment of the present invention, the input module includes a lithium battery and a power circuit, and the positive and negative electrodes of the lithium battery are respectively connected to the power circuit to provide a DC voltage input.

[0022] In one embodiment of the present invention, the input module further includes:

[0023] A display screen is electrically connected to the power circuit and is used to observe signal parameters inside the system.

[0024] The technical solution of the utility model increases the voltage of the DC voltage provided by the power supply and then converts it into an AC voltage by setting a boost module and a modulation module, so that the magnetic particle flaw detector can switch between the DC mode and the AC mode, and can perform a comprehensive and detailed inspection of the workpiece, which is more convenient and saves a lot of inspection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 The utility model is a schematic diagram of an integrated AC-DC conversion magnetic particle flaw detector.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] Reference Figure 1 The utility model proposes an integrated AC / DC conversion magnetic particle flaw detector, including an input module, a boost module and a modulation module, which are used to provide a DC voltage input for the system; the boost module is electrically connected to the input module, and is used to boost the input DC voltage to form a high-voltage DC voltage; the modulation module is electrically connected to the boost module, and is used to convert the high-voltage DC voltage into an AC voltage and output it.

[0030] It can be understood that the input module has a DC power supply for providing DC voltage input to the system. In this example, the DC power supply is a lithium battery, which provides a relatively low-voltage DC voltage. In order to make the system finally output an AC voltage suitable for detection, a boost module and a modulation module are also provided. The boost module is provided with at least a transformer, which can boost the low-voltage DC voltage provided by the power supply into a high-voltage DC voltage; the modulation module is internally connected to a MOS switch tube, and by adjusting the switching rate of the switch tube, AC voltages of different frequencies can be obtained, thereby completing the conversion from DC to AC.

[0031] When the system is not started, the magnetic particle detector performs DC magnetic particle inspection, usually using a DC power supply to generate a magnetic field, and then applying magnetic powder to the surface of the object to be inspected. The DC magnetic field causes the magnetic powder to form a magnetic flux leakage at the defect, thereby forming traces of magnetic powder aggregation around the surface defect for observation; when the system is started, DC power is converted into AC power, and the magnetic particle detector performs AC magnetic particle inspection, using an AC power supply to generate a magnetic field. Under the AC magnetic field, the magnetic powder will produce a hysteresis effect in the change of the magnetic field, causing the magnetic powder to form more obvious aggregation at the defect, which helps to detect smaller surface defects.

[0032] Through the above settings, the magnetic particle flaw detector can perform both DC and AC flaw detection, and can conduct detailed and comprehensive detection of surface damage and deep buried damage of the workpiece without the need to use two flaw detectors for detection, which greatly saves detection time and manpower.

[0033] Reference Figure 1 In one embodiment of the present application, the boost module includes a high-frequency inverter circuit and a rectifier. The high-frequency inverter circuit is electrically connected to the input module and is used to invert the DC voltage provided by the input module into a high-frequency low-voltage pulse; the rectifier is electrically connected to the high-frequency inverter circuit and is used to convert the high-frequency low-voltage pulse into a high-voltage DC voltage.

[0034] It can be understood that the function of the high-frequency inverter circuit is to convert the low-voltage direct current provided by the power supply into high-frequency, low-voltage alternating current pulses through high-frequency DC / AC conversion technology. At this time, the high-frequency, low-voltage pulses are connected to the rectifier for boosting and rectification to obtain a high-voltage DC voltage.

[0035] Reference Figure 1 In one embodiment of the present application, a high-frequency MOSFET switch tube is electrically connected in the high-frequency inverter circuit, and the high-frequency MOSFET switch tube has a high-frequency switching rate to convert the DC voltage into a high-frequency low-voltage pulse.

[0036] It can be understood that the high-frequency MOSFET switch tube is a field effect tube, and its working principle is to control the electron channel between the drain and the source through the gate voltage, thereby realizing the control and regulation of the current. In this case, the switching rate of the high-frequency MOSFET switch tube is very high, which can convert the low-voltage DC current provided by the power supply into high-frequency low-voltage AC current when passing through it.

[0037] Reference Figure 1 In one embodiment of the present application, the rectifier includes a transformer, a rectifier circuit and a first filter circuit. The transformer is electrically connected to the high-frequency inverter circuit, and is used to boost the high-frequency low-voltage pulses provided by the high-frequency inverter circuit to form high-voltage pulses; the rectifier circuit is electrically connected to the transformer, and is used to convert the high-voltage pulses into high-voltage DC voltage; the first filter circuit is electrically connected to the rectifier circuit, and is used to filter out the AC signal in the high-voltage DC voltage and retain its DC signal.

[0038] It can be understood that the transformer first boosts the high-frequency low-voltage pulses flowing out of the high-frequency inverter circuit, usually to high-voltage pulses of about 300V, and then flows through the rectifier circuit to convert AC power into DC power. At this time, a high-voltage DC voltage is obtained, and then a filter circuit is used to reduce the AC component in the pulsating DC voltage as much as possible, retain its DC component, reduce the output voltage ripple factor, and make the waveform smoother.

[0039] Reference Figure 1 In one embodiment of the present application, the modulation module includes an SPWM modulation circuit and a second filtering circuit. The SPWM modulation circuit is electrically connected to the rectifier and is used to modulate the high-voltage DC voltage output by the rectifier into a low-frequency AC voltage; the second filtering circuit is electrically connected to the SPWM modulation circuit and is used to filter out the high-frequency signal in the low-frequency AC voltage and retain its low-frequency signal.

[0040] It can be understood that pulse width modulation (PWM) control is a technology for modulating pulse width. By modulating the width of a series of pulses, the desired waveform (including shape and amplitude) is equivalently obtained. SPWM changes the modulation pulse mode based on PWM. The pulse width time duty cycle is arranged according to the sine law, so that the output waveform can be properly filtered to achieve a sinusoidal output. In this example, the waveform and frequency of the high-voltage DC voltage are modulated by the SPWM modulation circuit to obtain a lower-frequency sinusoidal AC waveform. It should be noted that the lower frequency here corresponds to the frequency at which the machine can work normally. Too high or too low a frequency will affect the normal operation of the machine; the second filtering circuit is a low-frequency filtering circuit, and its purpose is to filter out the high-frequency components in the low-frequency AC power and retain only the low-frequency part, so that the output voltage ripple factor is reduced and the waveform becomes smoother.

[0041] In an embodiment of the present application, the frequency of the low-frequency AC voltage is 50 Hz.

[0042] Understandably, the frequency of domestic or industrial electricity in my country is currently 50 Hz, and most equipment is also designed according to the frequency of 50 Hz. By modulating 50 Hz AC power through the SPWM modulation circuit, the equipment can work normally and meet the rated power of the equipment, avoiding equipment burnout or insufficient power.

[0043] Reference Figure 1 In one embodiment of the present application, the input module includes a lithium battery and a power supply circuit, and the positive and negative electrodes of the lithium battery are respectively connected to the power supply circuit to provide a DC voltage input.

[0044] Understandably, the use of lithium batteries for power supply means that the system does not need to be connected to a power source with a power cord, which increases portability and flexibility, enables wireless operation, is convenient to carry and use, and the battery is also relatively easy to replace, ensuring long-term stable operation of the device.

[0045] Reference Figure 1 In one embodiment of the present application, the input module also includes a display screen, which is electrically connected to the power circuit for observing signal parameters inside the system.

[0046] It can be understood that the system status information, parameter information of input and output signals, etc. can be observed more conveniently through the display screen, and the operating status of the system can be grasped in real time, which is convenient for inspection and control.

[0047] The technical solution of the utility model increases the voltage of the DC voltage provided by the power supply and then converts it into an AC voltage by setting a boost module and a modulation module, so that the magnetic particle flaw detector can switch between the DC mode and the AC mode, and can perform a comprehensive and detailed inspection of the workpiece, which is more convenient and saves a lot of inspection time.

[0048] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0049] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An integrated AC / DC conversion magnetic particle flaw detector, characterized in that: include An input module, used to provide a DC voltage input for the system; A boost module, electrically connected to the input module, for boosting the input DC voltage to form a high-voltage DC voltage; The modulation module is electrically connected to the boost module and is used to convert the high-voltage direct current voltage into an alternating current voltage and output it.

2. The integrated AC / DC conversion magnetic particle flaw detector according to claim 1 is characterized in that: The boost module comprises: A high-frequency inverter circuit, electrically connected to the input module, for inverting the DC voltage provided by the input module into high-frequency low-voltage pulses; The rectifier is electrically connected to the high-frequency inverter circuit and is used to convert the high-frequency low-voltage pulses into a high-voltage direct current voltage.

3. The integrated AC / DC conversion magnetic particle flaw detector according to claim 2 is characterized in that: A high-frequency MOSFET switch tube is electrically connected in the high-frequency inverter circuit. The high-frequency MOSFET switch tube has a high-frequency switching rate so as to convert the DC voltage into a high-frequency low-voltage pulse.

4. The integrated AC / DC conversion magnetic particle flaw detector according to claim 2 is characterized in that: The rectifier comprises: A transformer, electrically connected to the high-frequency inverter circuit, for boosting the high-frequency low-voltage pulse provided by the high-frequency inverter circuit to form a high-voltage pulse; A rectifier circuit, electrically connected to the transformer, for converting high-voltage pulses into high-voltage direct current voltage; The first filter circuit is electrically connected to the rectifier circuit and is used to filter out the AC signal in the high voltage DC voltage and retain its DC signal.

5. The integrated AC / DC conversion magnetic particle flaw detector according to claim 2 is characterized in that: The modulation module comprises: An SPWM modulation circuit, electrically connected to the rectifier, for modulating the high-voltage DC voltage output by the rectifier into a low-frequency AC voltage; The second filtering circuit is electrically connected to the SPWM modulation circuit and is used for filtering out the high-frequency signal in the low-frequency AC voltage and retaining the low-frequency signal.

6. The integrated AC / DC conversion magnetic particle flaw detector according to claim 5, characterized in that: The frequency of the low-frequency AC voltage is 50 Hz.

7. The integrated AC / DC conversion magnetic particle flaw detector according to claim 1, characterized in that: The input module includes a lithium battery and a power circuit. The positive and negative electrodes of the lithium battery are respectively connected to the power circuit to provide a DC voltage input.

8. The integrated AC / DC conversion magnetic particle flaw detector according to claim 7, characterized in that: The input module also includes: A display screen is electrically connected to the power circuit and is used to observe signal parameters inside the system.

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