Metal detector
By adopting alternating magnetic field and signal processing technology in metal detectors, combined with display screens and real-time feedback devices, the problem of inaccurate positioning of traditional metal detectors is solved, and higher positioning accuracy and efficiency are achieved.
Patent Information
- Application Number
- CN202422517228.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-17
AI Technical Summary
Traditional metal detectors have low accuracy when determining metal positions, making it difficult to quickly and accurately locate the specific position of the metal.
A pair of metal detection components are used to generate an alternating magnetic field, detect the metal position through the alternating magnetic field, and display the magnetic field changes using the display screen. The signal is processed in combination with the MCU module to improve positioning accuracy, and is equipped with a buzzer and signal light for real-time feedback.
Through the coupling effect and signal processing of the alternating magnetic field, the position of the metal can be accurately judged, which improves the accuracy and efficiency of metal detection and ensures construction safety.
Smart Images
Figure CN223296156U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of metal detection, and in particular to a metal detector. Background Art
[0002] As people's living standards improve, their demands for better living and working environments increase. During renovations, wires, metal pipes, and other metal materials are often buried inside walls. This makes it difficult to quickly determine the wiring path during circuit or waterway inspections. Therefore, metal detectors are needed to locate wires, metal pipes, and other metal materials. Traditional metal detectors typically use a single coil to detect metal, which is usually connected to a buzzer or flashlight. The intensity of the buzzer or brightness of the flashlight is used to determine the metal's location, resulting in low accuracy. Summary of the Invention
[0003] The purpose of this application is to provide a metal detector to solve the technical problem of "the accuracy of metal position determined during metal detection is not high".
[0004] A metal detector provided in the present application adopts the following technical solution: it includes a shell, a circuit board installed in the shell, and a battery pack installed on the shell; it is characterized in that: a pair of metal detection components are symmetrically installed on the circuit board; the metal detection components are used to generate an alternating magnetic field and detect the position of metal through the alternating magnetic field; a display screen is installed on the shell; the display screen is connected to the circuit board; and the display screen is used to display the magnetic field changes of the metal detection components.
[0005] Optionally, the metal detection assembly includes a magnetic rod, an excitation coil is provided on the magnetic rod, an induction coil is provided on the magnetic rod, and the induction coil is arranged at an end of the magnetic rod away from the circuit board; the excitation coil is arranged at an end of the magnetic rod close to the circuit board; the number of induction coils is greater than the number of excitation coils.
[0006] Optionally, a voltage stabilizer is provided on the circuit board, an MCU module is installed on the circuit board, a pulse modulation module is provided in the MCU module, the voltage stabilizer input end is connected to the battery pack, and the voltage stabilizer output end is connected to the MCU module; the pulse modulation module output end is connected to the excitation coil; the induction coil is connected to the MCU module; and the display screen is connected to the MCU module.
[0007] Optionally, a buzzer and a signal light are installed on the housing; the buzzer and the signal light are connected to the MCU module.
[0008] Optionally, the MCU module is also connected to a wood detection module and a current detection module.
[0009] Optionally, a plurality of mode control buttons are provided on the front of the shell; a mode control button is provided on the side of the shell; the mode control button is connected to the MCU module; the mode adjustment button is used to adjust the excitation parameters; the mode control button is used to control the switching of the working mode.
[0010] In summary, this application includes at least one of the following beneficial technical effects:
[0011] 1. During the metal detection process, the metal detection component generates an alternating magnetic field. After signal processing, the metal detection component will output an initial level. When the metal detection component is not close to the metal, the magnetic flux around the metal detection component does not change significantly, and the output signal does not differ significantly. When two sets of metal detection components are close to the metal, the magnetic field generated by the metal detection component couples with the metal, the magnetic flux decreases, and the waveform output by the metal detection component begins to change. The closer the metal detection component is to the metal, the greater the magnetic flux loss and the less magnetic flux fed back. The two metal detection components are at different distances from the metal, so the output signals will be quite different. The metal position can be predicted by the size of the waveform changes of the two metal detection components. When the metal is close to the middle position of the two sets of metal detection components, the amplitude of the two sets of waveform changes tends to be the same. At this time, it is determined that the metal is located in the middle of the two metal detection components, thereby improving the positioning accuracy of the metal.
[0012] 2. The closer the metal detection component is to the metal position, the greater the amplitude of the waveform change output by the metal detection component. The metal position can be predicted by the waveform amplitude, thereby improving positioning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the present application;
[0014] Figure 2 This is a schematic diagram of the structure of the metal detection assembly according to an embodiment of the present application;
[0015] Figure 3 This is a schematic diagram of the circuit principle structure of an embodiment of the present application;
[0016] Figure 4 This is a schematic diagram of the principle structure of the metal detection component of the embodiment of the present application when it is not close to metal;
[0017] Figure 5 This is a schematic diagram of the metal principle structure of an embodiment of the present application;
[0018] Figure 6 It is a schematic diagram of the overall structure of the embodiment of the present application;
[0019] In the figure, 1. Housing; 11. Mode control button; 12. Adjustment button; 13. Buzzer; 14. Signal light; 2. Circuit board; 21. Voltage regulator; 22. MCU module; 23. Pulse modulation module; 24. Wood detection module; 25. Current detection module; 3. Battery pack; 4. Metal detection component; 41. Magnetic rod; 42. Excitation coil; 43. Induction coil; 5. Display screen. DETAILED DESCRIPTION
[0020] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.
[0021] Reference Figure 1 , a metal detector includes a shell 1, a circuit board 2 is fixedly installed in the shell 1, and a battery pack 3 is installed on the back of the shell 1; a pair of metal detection components 4 are symmetrically installed on the circuit board 2; the metal detection component 4 is used to generate an alternating magnetic field and detect the position of metal through the alternating magnetic field; a display screen 5 is installed on the shell 1; the display screen 5 is connected to the circuit board 2; the display screen 5 is used to display the magnetic field changes of the metal detection component 4; the changes in the magnetic field of the metal detection component 4 are processed to form a waveform graph, and the changes in the magnetic field are converted into electrical signals and displayed on the display screen 5 in the form of waves. When the metal detection component 4 approaches the metal, the magnetic fields generated by the two groups of metal detection components 4 are coupled with the metal. At this time, the metal detection component 4 generates a waveform change. The closer it is to the metal, the greater the waveform change. The position of the metal can be predicted by the difference between the two groups of waveforms. When the metal is located in the middle position of the two groups of metal detection components 4, the waveform changes formed by the two groups of metal detection components 4 tend to be the same, thereby improving the metal positioning speed and improving the metal positioning accuracy.
[0022] Reference Figure 2 、 Figure 4 、 Figure 5The metal detection assembly 4 includes a magnetic rod 41, an excitation coil 42 is provided on the magnetic rod 41, and an induction coil 43 is provided on the magnetic rod 41. The induction coil 43 is arranged at the end of the magnetic rod 41 close to the detection metal; the excitation coil 42 is provided at the end of the magnetic rod 41 away from the detection metal; when working, it can be close to the metal, and the number of induction coils 43 is greater than the number of excitation coils 42; the excitation coil 42 is connected to the alternating current to generate an alternating magnetic field, and the induction coil 43 generates an alternating current and a magnetic field under the induction of the magnetic field. When the induction coil 43 is close to the metal, the induction coil 43 couples with the metal through the generated alternating magnetic field, the magnetic flux around the induction coil decreases, and the feedback voltage of the induction coil 43 becomes smaller. Therefore, the difference between the feedback voltage and the initial voltage becomes larger, and the closer to the metal, the greater the amplitude difference. The position of the metal can be predicted by the change in the amplitude of the two sets of voltage waveforms; when the amplitudes of the two sets of waveforms are the same, it is determined that the metal is in the middle position of the two sets of metal detection assemblies 4, thereby improving the positioning accuracy and positioning efficiency.
[0023] Reference Figure 3 , Figure 4 、 Figure 5 A voltage regulator 21 is provided on the circuit board 2, an MCU module 22 is installed on the circuit board 2, a pulse modulation module 23 is provided in the MCU module 22, the input end of the voltage regulator 21 is connected to the battery pack 3, and the output end of the voltage regulator 21 is connected to the MCU module 22; the output end of the pulse modulation module 23 is connected to the metal detection component 4; the induction coil 43 is connected to the MCU module 22; and the display screen 5 is connected to the MCU module 22.
[0024] The pulse modulation module 23 (PWM) generates pulses of a certain frequency, which converts the DC power of the battery pack 3 into AC power and applies it to the excitation coil 42, so that the excitation coil 42 generates an alternating magnetic field. The induction coil 43 generates an induced voltage under the action of the magnetic rod 41 and the alternating magnetic field, and also generates an alternating magnetic field. When the induction coil 43 is close to metal, the induction coil 43 couples with the metal, the magnetic flux around the induction coil 43 decreases, and the induced voltage generated by the induction coil 43 decreases. The voltage signal of the induction coil 43 is processed by the MCU module 22 and displayed on the display screen 5. When no metal is detected, the induced voltage of the two sets of induction coils 43 is The pressure tends to be equal. When metal is detected, the magnetic field couples with the metal, the magnetic flux around the induction coil 43 becomes smaller, and the induced voltage of the induction coil 43 becomes smaller. The closer to the metal, the greater the magnetic flux loss, and the induced voltage of the induction coil 43 becomes smaller due to the reduction of magnetic flux. Therefore, the waveform amplitude formed by the induced voltage generated by the induction coil 43 decreases. According to the changes in the waveform diagram formed by the induced voltages of the two induction coils 43, the metal position can be predicted; when the metal is located in the middle position of the metal detection component 4, the induced voltages generated by the two groups of metal detection components 4 tend to be the same again; thereby improving the metal detection efficiency and increasing the accuracy of detecting the metal position.
[0025] Reference Figure 1 、 Figure 3 A buzzer 13 and a signal light 14 are installed on the housing 1; the buzzer 13 and the signal light 14 are connected to the MCU module 22. When the metal detection component 4 detects metal, the buzzer 13 sounds an alarm to remind the operator, and the signal light 14 judges the distance to the metal by the intensity of the light.
[0026] Reference Figure 3 The MCU module 22 is also connected to a wood detection module 24 and a current detection module 25; the wood detection module 24 is used to detect wood inside the wall, and the current detection module 25 is used to check whether the detected metal is charged to ensure construction safety.
[0027] Reference Figure 6 A plurality of mode control buttons 11 are provided on the front of the housing 1; a mode adjustment button 12 is provided on the side of the housing 1; the mode control button 11 is connected to the MCU module 22; the mode adjustment button 12 is used to adjust the excitation parameters; the mode control button 11 is used to control the switching of the working mode.
[0028] The mode adjustment key 12 adjusts the current applied to the excitation coil 42 and the pulse frequency emitted by the pulse modulation module 23 to adjust the waveform to improve the positioning accuracy;
[0029] The mode control button 11 can control the switching of the working mode, so that the metal detector can detect wood and whether the detected metal is charged, making construction safer.
[0030] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.
Claims
1. A metal detector comprising a housing (1), a circuit board (2) mounted in the housing (1), and a battery pack (3) mounted on the housing (1); characterized in that: A pair of metal detection components (4) are symmetrically mounted on the circuit board (2); the metal detection components (4) are used to generate an alternating magnetic field and detect the position of metal through the alternating magnetic field; a display screen (5) is mounted on the housing (1); the display screen (5) is connected to the circuit board (2); the display screen (5) is used to display the magnetic field changes of the metal detection components (4).
2. A metal detector according to claim 1, characterized in that: The metal detection assembly (4) comprises a magnetic bar (41), an excitation coil (42) is sleeved on the magnetic bar (41), an induction coil (43) is sleeved on the magnetic bar (41), and the induction coil (43) is arranged at one end of the magnetic bar (41) for detecting metal; the excitation coil (42) is arranged at one end of the magnetic bar (41) away from the detected metal; and the number of the induction coils (43) is greater than the number of the excitation coils (42).
3. The metal detector according to claim 2, characterized in that: A voltage regulator (21) is provided on the circuit board (2), an MCU module (22) is mounted on the circuit board (2), a pulse modulation module (23) is provided in the MCU module (22), an input end of the voltage regulator (21) is connected to the battery pack (3), and an output end of the voltage regulator (21) is connected to the MCU module (22); an output end of the pulse modulation module (23) is connected to the excitation coil (42); the induction coil (43) is connected to the MCU module (22); and the display screen (5) is connected to the MCU module (22).
4. A metal detector according to claim 3, characterized in that: A buzzer (13) and a signal light (14) are installed on the housing (1); the buzzer (13) and the signal light (14) are connected to the MCU module (22).
5. The metal detector according to claim 3, characterized in that: The MCU module (22) is also connected to a wood detection module (24) and a current detection module (25).
6. The metal detector according to claim 5, characterized in that: A plurality of mode control buttons (11) are provided on the front of the housing (1); a mode control button (12) is provided on the side of the housing (1); the mode control button (11) is connected to the MCU module (22); the mode control button (12) is used to adjust the excitation parameters; and the mode control button (11) is used to control the switching of the working mode.