Double-sheet detection mechanism of transmission-type sensor

Abstract

The utility model discloses a double-sheet detection mechanism of a transmission-type sensor, which comprises a transmitting and receiving coil, a coil magnetic core, a function signal generator and a signal control and processing circuit, the transmitting and receiving coil is mounted in a correlation manner, the transmitting coil adopts a copper wire with a double-layer structure, and the inner diameter and the outer diameter of the transmitting coil are mutually matched and wound; mnZn ferrite is adopted as a magnetic core of the coil, and the magnetic conductivity and the electrical conductivity of the ferrite are determined according to the relation between the electrical conductivity of the magnetic core and the eddy-current loss; the function signal generator adopts an AD9833 signal generator, and through power amplification and pre-stage voltage follower isolation buffering, it is guaranteed that an output signal is stable and reliable so as to drive a follow-up circuit. The double-sheet detection mechanism provided by the utility model overcomes the defects of the existing metal sheet detection technology in the aspects of precision, material adaptability, operation convenience and the like, effectively guarantees the quality and efficiency of metal sheet processing in industrial production, accurately detects the number of metal sheets, and avoids the production problem caused by misjudgment of the sheet number.

Description

TECHNICAL FIELD

[0001] The utility model relates to the detection separation field of double and multi-plate, specifically a double detection mechanism of transmission sensor. BACKGROUND

[0002] In the stamping industry, metal plates are often adsorbed together during transportation due to some objective factors (such as air humidity, metal burrs, etc.), causing the mechanical hand suction cup to suck double or multi-plates. Moreover, most double detection instruments on the market only alarm and do not achieve the purpose of estimating the number of plates and actively separating them.

[0003] Chinese patent CN119153350A discloses a calibration method for an eddy current sensor, a thickness measurement method, a device, and a chemical mechanical polishing apparatus. The method includes obtaining a first excitation signal generated by a signal source of an eddy current sensor before chemical mechanical polishing of a wafer; obtaining a second excitation signal generated by the signal source of the eddy current sensor during the chemical mechanical polishing of the wafer, and obtaining a wafer signal collected by the eddy current sensor; correcting the wafer signal according to the first excitation signal and the second excitation signal to obtain a corrected wafer signal; and establishing a mapping relationship between the calibration information determined according to the corrected wafer signal and the pre-determined wafer thickness to calibrate the eddy current sensor. Although this calibration method for the eddy current sensor improves the accuracy of measuring the thickness of the metal film by combining the chemical mechanical polishing process, it has potential defects such as complex excitation signal changes, difficult control of polishing process variables, inaccurate mapping relationship establishment, high cost of calibration time, limited application scenarios, high technical implementation difficulty, and susceptibility to environmental factors. UTILITY MODEL CONTENT

[0004] To overcome the defects of existing metal plate detection technology in terms of precision, material adaptability, and operation convenience, and to effectively ensure the quality and efficiency of metal plate processing in industrial production, the utility model provides a high-precision, multi-functional, and stable and reliable double detection mechanism of transmission sensor, which accurately detects the number of metal sheets and avoids production problems caused by misjudgment of the number of sheets.

[0005] The technical solution to achieve the utility model is as follows:

[0006] A double detection mechanism of transmission sensor, including a transmitting and receiving coil, a coil magnetic core, a function signal generator, and a signal control and processing circuit, which is different from the prior art in that:

[0007] The transmitting and receiving coil is installed in a pair of shots, wherein the transmitting coil is made of double-layer copper wire, and the inner diameter and outer diameter are cooperatively wound;

[0008] The magnetic core of the coil adopts MnZn ferrite, and according to the relationship between the conductivity of the magnetic core and the eddy current loss, the magnetic permeability and the conductivity of the ferrite are determined;

[0009] The function signal generator adopts an AD9833 signal generator, is isolated and buffered through a power amplifier and a front-stage voltage follower, and guarantees that an output signal is stable and reliable, so as to drive a subsequent circuit.

[0010] The signal control and processing circuit adopts a G6S-2 relay to select a signal according to material magnetism, is driven by an MMBT9012H transistor, and is controlled by an optocoupler, so that a pull-up resistor of the transistor and a relay coil are connected in parallel with a diode, so as to guarantee that the circuit is stable and reliable, avoid interference and component damage, after a signal is received, the input signal is input through a JRC-23F relay, and synchronous control is performed on output selection, in a signal processing core link, a pi-type wave selection circuit accurately selects a frequency, a typical precision rectifier circuit skillfully processes a signal, finally, a resistance divides a voltage to adapt a 9V voltage after rectification and filtering to an AD acquisition range of an stm32f103, and it is guaranteed that acquisition accuracy and system compatibility are ensured.

[0011] A specific frequency excitation signal is generated through accurate regulation of the signal generator by the single-chip microcomputer, the signal is amplified to drive a transmitting coil to generate a magnetic field, when a metal plate is inserted between the transmitting coil and the receiving coil, the amplitude of the signal received by the receiving coil changes, after processing, the signal is acquired by the single-chip microcomputer 12, and the number of the plate is determined by comparing the acquired signal with pre-stored calibration data, the detection result is clearly displayed by an LED and a nixie tube in real time, and the single-chip microcomputer outputs a control signal to drive external equipment to work cooperatively according to the detection result, so that automatic detection of the whole process is realized.

[0012] The utility model discloses the beneficial effect is:

[0013] 1. High-precision detection performance:

[0014] An stm32f103rct6 single-chip microcomputer is adopted as a main control chip, an AD9833 is adopted as a signal generator, high performance of the chip, optimized design of the coil, signal generation and processing circuit and the like are relied on, compared with traditional technologies, higher detection precision is obtained, 0, 1 and 2 and more situations can be accurately distinguished, error rate is significantly reduced, product quality defects and equipment faults caused by detection errors are effectively prevented, and industrial production yield and stability are greatly improved.

[0015] 2. Wide material adaptability:

[0016] A unique double-channel design is adopted, different signals are selected through a relay, and the invention can efficiently detect two kinds of metal materials, i.e., steel plates and aluminum plates, through key control, the invention breaks through the single-material limitation of traditional detection equipment, meets diversified needs of complex industrial production scenes, and improves equipment application flexibility and universality.

[0017] 3. Convenient operation and clear display:

[0018] Adopt simple and intuitive button operation and real-time clear LED, nixie tube display, greatly reduce the technical threshold and labor intensity of operation personnel, without complex training can be skilled operation, improve the friendliness and work efficiency of human-computer interaction, optimize the production process experience. Meanwhile, the main control chip stm32f103rct6 can output control signal to drive external equipment to work cooperatively according to the detection result, realize automatic detection of whole process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The circuit diagram of the double sheet detection mechanism of the utility model;

[0020] Figure 2 The schematic diagram of the tower crane carrying metal plate of the embodiment of the utility model;

[0021] Figure 3 The schematic diagram of the tower crane structure of the embodiment of the utility model;

[0022] Figure 4 The schematic diagram of the eddy current sensor structure of the embodiment of the utility model.

[0023] In the figure: 1. base, 2. rotating platform, 3. longitudinal guide rail, 4. rotating shaft, 5. travelling mechanism, 6. motor, 7. motor, 8. transverse guide rail, 9. travelling mechanism, 10. tensioner, 11. suction cup, 12-1. fixing hole, 12-2. excitation coil, 12-3. receiving coil. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and examples. EMBODIMENT

[0025] As Figure 1 shown, a double sheet detection mechanism of a transmission sensor, comprising:

[0026] 1. Transmit and receive coils:

[0027] When detecting 0.5mm-4mm metal sheet material, the same as part of the traditional design, the transmission type installation is adopted. However, the application has innovation in material selection and structure optimization. The transmission coil selects 0.18mm copper wire (0.2mm after painting), unique double-layer structure (N1:N2≈1:3) and specific inner diameter (φ6, φ7.5 after removing skeleton) and outer diameter (φ14) design, combined with the winding mode of receiving coil 0.08mm copper wire (actual 0.1mm), effectively improve the detection sensitivity and stability.

[0028] 2. Coil core:

[0029] The existing detection technology mostly uses ferrite, pure iron or amorphous alloy as the magnetic core material, and the application selects MnZn ferrite (φ6*8mm) through in-depth research. Compared with the pure iron magnetic core which is easy to cause high eddy current loss and the amorphous alloy which is easy to be damaged in the factory environment, the application determines the ferrite permeability (μ0 = 2000), the conductivity (0.01 S / m) and other parameters in the system according to the relationship between the conductivity of the magnetic core and the eddy current loss. In the alternating magnetic field, the low conductivity effectively suppresses the eddy current loss, and when the magnetic permeability is about 1500H / m, the coil impedance and the detection voltage change stably, which ensures the stable and efficient detection performance.

[0030] 3. Function signal generator:

[0031] The application is consistent with the purpose of the same part of the traditional design, and needs to generate a specific frequency waveform signal, but it is different from the traditional design. The application selects AD9833 as the signal generator. AD9833 is a low-power and high-integration DDS circuit, and a small number of external components can generate a high-precision waveform of 0-12.5MHz (such as an external 25Mhz active crystal oscillator with a precision of 0.1hz, and 0.004hz at 1Mhz). It supports multiple waveform outputs, and can flexibly set frequency, phase, mode and other parameters through simple 3 serial interface lines (compatible with SPI) programming control. In the aspect of PCB design, the principle of separating analog ground and digital ground, single-point grounding is strictly followed, the power supply wiring is optimized, and 106 tantalum capacitors and 104 ceramic capacitors are configured for decoupling, which effectively improves the signal quality. After LM1875T power amplification and front-stage voltage follower isolation buffer, the output signal is stable and reliable to drive the subsequent circuit. Compared with the traditional manual resistance adjustment waveform generator (such as MAX038), the application has advantages in precision, cost, wiring and control convenience.

[0032] 4. Signal control and processing circuit:

[0033] The signal processing procedure is common with some existing technologies, but the specific circuit design and component selection are unique. Before amplification, an Omron G6S-2 relay is used to select signals based on material magnetism, driven by an MMBT9012H triode (amplified by 160 times). The light coupling control is carefully designed with a triode pull-up resistor and a relay coil parallel diode to ensure stable and reliable circuit, avoiding interference and component damage. After signal reception, the input signal is selected by a Hongfa JRC-23F relay, which is synchronized with the output selection control. In the core signal processing link, the pi-type wave selection circuit (1Khz-26Khz) accurately filters the frequency, and the typical precision rectifier circuit skillfully processes the signal. Although there is a 0.6V voltage difference, it does not affect the overall function. Finally, the resistance divides the approximately 9V voltage after rectification and filtering to adapt to the AD collection range of the stm32f103 (0-3.3V), ensuring collection accuracy and system compatibility.

[0034] Before detection, accurate calibration is performed for different numbers of metal sheet materials to determine the AD values corresponding to 0 sheets (value0), 1 sheet (value1), 2 sheets or more (value2), and divide them into three precise intervals: greater than value1+(value0-value1) / 2 for 0 sheets, between value1+(value0-value1) / 2 and value2+(value1-value2) / 2 for 1 sheet, and less than value2+(value1-value2) / 2 for 2 sheets or more. During detection, the sensor receives the signal AD value belonging to the interval, quickly and accurately determines the number of metal sheet materials, and effectively improves the detection accuracy and efficiency. Specific embodiments

[0035] As shown in Figures 2-3 During the operation of the tower crane device, the various components work closely together to achieve efficient transportation and removal of metal sheet materials. The base 1 serves as the support foundation, stably supporting the other components of the entire device. The rotating platform 2 is connected to the base 1 through the rotating shaft 4, allowing for rotation operations to ensure that the tower crane can be adjusted to the appropriate working angle. The longitudinal guide rail 3 and the transverse guide rail 8 form a guide system together, allowing the tower crane to move accurately in the longitudinal and transverse directions. The walking mechanism 5 moves through the longitudinal guide rail 3 and the transverse guide rail 8, and is driven by the motor 6. The two motors 6, 7 drive the rotating platform and the walking mechanism respectively, allowing the tower crane to perform rotation and movement tasks simultaneously. The tensioner 10 adjusts the tension of the transmission system to ensure smooth movement of all components. The suction cup 11 is installed on the boom and can grab metal sheet materials through vacuum suction. The suction cup is connected to a motor-driven system, allowing for suction and release operations to complete the removal of metal sheet materials.

[0036] As shown in Figure 4 The fixed hole 12-1 of the eddy current sensor is used to stably install the sensor on the measuring device. When detecting, the excitation coil 12-2 is excited by current to generate an alternating magnetic field, which acts on the surrounding conductive object to generate eddy current. The receiving coil 12-3 captures the signal change caused by the eddy current effect by sensing the change of the magnetic field, and converts these signals into electrical signals, which are transmitted to the control system for further analysis.

[0037] When the double sheet detection device detects that the number of metal plates is two or more, the system will automatically start the tower crane to perform the cleaning operation. The tower crane completes the grabbing through the precisely controlled vacuum suction cup, first adjusts the suction cup above the excess plate, starts the suction system to firmly adsorb the plate. Subsequently, the tower crane separates the suction cup from the plate through the lifting action, and uses the 360-degree rotation function to smoothly move the plate to the designated cleaning area. After reaching the target position, the tower crane releases the suction cup and places the plate smoothly, and then recovers the suction cup and prepares to process the next batch of plates.

Claims

1. A double sheet detection mechanism of a transmission sensor, comprising a transmitting and receiving coil, a coil magnetic core, a function signal generator and a signal control and processing circuit, characterized in that: the transmitting and receiving coil is installed in a pair of shots, wherein the transmitting coil is made of double-layer copper wire, and the inner diameter and the outer diameter are cooperatively wound; the coil magnetic core is made of MnZn ferrite, and the magnetic permeability and the electrical conductivity of the ferrite are determined according to the relationship between the electrical conductivity and the eddy current loss of the magnetic core; the function signal generator is an AD9833 signal generator, which is isolated and buffered by a power amplifier and a front-stage voltage follower to ensure the stability and reliability of the output signal for driving the subsequent circuit; the signal control and processing circuit uses a G6S-2 relay to select the signal according to the material magnetism, which is driven by a MMBT9012H transistor, and the transistor pull-up resistor and the relay coil are connected in parallel with a diode in the optical coupling control to ensure the stability and reliability of the circuit, avoid interference and component damage; after receiving the signal, the JRC-23F relay inputs the signal, and the output selection is synchronously controlled; in the signal processing core link, the π-type wave selection circuit accurately selects the frequency, and the typical precision rectifier circuit skillfully processes the signal, and finally the resistance divides the voltage of about 9V after rectification and filtering to adapt to the AD collection range of the stm32f103, ensuring the collection accuracy and system compatibility; the single-chip microcomputer accurately regulates the signal generator to generate an excitation signal, which drives the transmitting coil to generate a magnetic field after amplification; when the metal sheet is inserted between the transmitting and receiving coils, the amplitude of the signal received by the receiving coil changes, which is collected by the 12-bit AD of the single-chip microcomputer after processing, and compared with the pre-stored calibration data to determine the number of sheets, and the detection result is clearly displayed by the LED and the nixie tube in real time, while the single-chip microcomputer outputs a control signal to drive external equipment to work cooperatively according to the detection result, realizing full-process automatic detection.

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