Portable bergamot pear pulp brittleness detection device

Abstract

The invention discloses a portable bergamot pear pulp brittleness detection device which comprises a mechanical system, a hardware circuit system and a software control system, the hardware circuit system is installed on the mechanical system and electrically connected with the mechanical system, the software control system is in communication connection with the hardware circuit system, and the mechanical system comprises a puncture assembly, a sensing assembly and a shell. The puncture assembly and the sensing assembly are arranged in the shell through first M3 screws, the puncture assembly is fixedly installed on the sensing assembly, the puncture assembly is used for completing puncture of a sample, and the sensing assembly is used for sensing the puncture condition of the puncture assembly. According to the method, the brittleness of the internal pulp of the bergamot pears can be evaluated, the commodity rate of the bergamot pears can be improved, good varieties can be screened, convenience is provided for real-time detection, use of commercial tenants and detection departments is met, technical support is provided for portable intelligent detection of the brittleness of the bergamot pears, and the method has great significance in development of the Xinjiang bergamot pear industry.

Description

Technical Field

[0001] The invention relates to the technical field of pulp crispness detection, and in particular to a portable fragrant pear pulp crispness detection device. Background Art

[0002] Korla pear has a strong fragrance, thin skin and crispy flesh. It is a specialty fruit in Xinjiang. Crisp taste is one of the important indicators reflecting the excellent quality of pears, and it is also a highlight that the pear industry has been promoting. However, in recent years, due to horticultural factors and the use of drugs by fruit farmers to catalyze the early ripening of fruits, the quality of pear pulp has begun to deteriorate. In addition, in order to reduce damage to storage and transportation machinery and seize the market, a large number of pears picked during the green and ripe period with poor crisp taste are put on the market. Fruit farmers use drugs to catalyze the early ripening of fruits, resulting in low sugar content and sour taste in pears. The water and pectin content continue to decline, affecting the cell structure of the pears. This structural change in turn causes the crispness of the pears to decrease, affecting the reputation and market competitiveness of the high-quality quality of the pears. Consumers' recognition of the crisp taste of pears has declined, the reputation of pears has been damaged, and the price has begun to fall. Therefore, how to improve a portable pear pulp crispness detection device has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a portable pear pulp crispness detection device, which can realize the crispness evaluation of the internal pulp of the fragrant pear, improve the commercial rate of the fragrant pear and screen the excellent varieties, provide convenience for real-time detection, so as to meet the use of merchants and testing departments, and provide technical support for portable intelligent detection of the crispness of the fragrant pear, which is of great significance to the development of the Xinjiang fragrant pear industry.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A portable pear pulp crispness detection device comprises: a mechanical system, a hardware circuit system and a software control system, wherein the hardware circuit system is mounted on the mechanical system and electrically connected to the mechanical system, the software control system is communicatively connected to the hardware circuit system, the mechanical system comprises a puncture component, a sensing component and a housing, the puncture component and the sensing component are both arranged inside the housing by a first M3 screw, and the puncture component is fixedly mounted on the sensing component, the puncture component is used to complete the puncture of a sample, and the sensing component is used to sense the puncture condition of the puncture component.

[0006] Furthermore, the sensing assembly includes: a mechanical sensor, a force sensor bracket, an acoustic sensor, an acoustic sensor bracket, a probe mounting plate and a puncture probe; the top end of the mechanical sensor is mounted on the force sensor bracket by an M4 screw, and the bottom end is mounted on the acoustic sensor bracket by an M4 screw. The acoustic sensor is installed inside the acoustic sensor bracket and close to the puncture probe. The puncture probe is connected to the probe mounting plate and connected to the acoustic sensor bracket by a second M3 screw. The end face of the puncture probe is in contact with the ceramic coupling surface of the acoustic sensor to ensure the sensing signal.

[0007] Furthermore, the puncture assembly includes a stepper motor, a stepper motor bracket and a sample support platform; two stepper motor brackets are provided, which are symmetrically installed on both sides of the acoustic sensor bracket through M2 screws, and stepper motors are installed on the two stepper motor brackets. The sample drag platform is located below the stepper motor bracket, and both sides are threadedly connected to the retractable push rod installed on the stepper motor, and an M2.5 nut is installed on the end of the retractable push rod.

[0008] Furthermore, the shell includes a rear panel, an upper panel, a left panel, M1.6 screws, a partition, a front panel, a connecting profile, a lower panel, a right panel and an interface buckle; the rear panel, the left panel, the front panel, the lower panel and the right panel are surrounded by M1.6 screws to form a box body with an opening, the upper panel is installed on one side of the opening, a connecting profile is installed between the bottom sides of the left panel and the right panel, the partition is installed inside the box body to divide the inside of the box body into a front accommodating chamber and a rear accommodating chamber, and the interface buckle is installed on the outside of the right panel.

[0009] Furthermore, the hardware circuit system includes a PCB board, a control board memory and a touch screen, the PCB board and the control board memory are arranged inside the rear accommodating cavity, and the control board memory is electrically connected to the PCB board, the touch screen is installed on the other side of the box body opening and is electrically connected to the PCB board, and buttons are installed on the upper panel.

[0010] Furthermore, the PCB board includes a control board and a power board;

[0011] The control board includes an MCU, a power input interface, an MPU connection port, a motor drive circuit, a power conversion circuit, an acoustic sensor signal amplification circuit, a mechanical sensor signal amplification circuit and an ADC circuit; the MCU is electrically connected to the power input interface, the MPU connection port, the motor drive circuit, the power conversion circuit, the acoustic sensor signal amplification circuit, the mechanical sensor signal amplification circuit and the ADC circuit respectively;

[0012] The power board includes a switch interface, a charging interface, a power output interface, a 12V boost circuit and a power management circuit; the power management circuit is electrically connected to the switch interface, the charging interface, the power output interface and the 12V boost circuit respectively.

[0013] Furthermore, the mechanical sensor signal conditioning circuit includes a first-level mechanical sensor signal amplification circuit composed of an AD620 high-precision instrumentation amplifier, capacitor C1, capacitor C2, resistor R1, resistor R2, diode D1, diode D2, magnetic bead FB1, and magnetic bead FB2; a mechanical sensor filter circuit composed of capacitor C3, capacitor C4, resistor R3, and resistor R4; and a second-level mechanical sensor signal amplification circuit composed of an OP07 precision operational amplifier, resistor R5, resistor R6, capacitor C5, and capacitor C6.

[0014] Furthermore, the acoustic sensor signal conditioning circuit includes an acoustic sensor preamplifier circuit composed of an OP07 operational amplifier, a resistor R7, a resistor R8, a capacitor C7, a capacitor C8, and a capacitor C9; an acoustic sensor signal primary amplifier circuit composed of an OP07 operational amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C12, a capacitor C13, and a capacitor C14; and an acoustic sensor signal secondary amplifier circuit composed of an OP07 operational amplifier, a resistor R18, a resistor R19, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C26.

[0015] Furthermore, the battery management circuit includes a battery protection circuit composed of a DW01 battery protection chip and an 8205A MOS field effect and a charge and discharge management circuit designed by a SW6106 charge and discharge management chip, wherein the 21, 22, and 23 pins of the SW6106 charge and discharge management chip are respectively connected to the SW6106_SCK, SW6106_SDA, and SW6106_IRQ networks; the 5V power supply of the power management output circuit is connected to the +5 network.

[0016] Furthermore, the software control system is divided into a lower computer software system and an upper computer software system;

[0017] The lower computer software system runs in the MCU, including a command receiving module, a puncture process control module, a motor operation control module and a mechanical sensor overload protection module; the upper computer software system runs in the MPU, including a human-computer interaction module, a data receiving module and a brittleness calculation module;

[0018] The instruction receiving module is responsible for receiving the instructions sent by the human-computer interaction module; the puncture process control module calls the motor operation control module to realize the control of the probe puncturing the pulp process, and sends the force and sound data during the puncture to the data receiving module; the mechanical sensor overload protection module realizes overload protection of the mechanical sensor.

[0019] The human-computer interaction module realizes human-computer interaction through the UI interface and sends control instructions to the instruction receiving module; the data receiving module is responsible for receiving the force and sound data during the puncture process; the brittleness calculation module calculates the brittleness value based on the force and sound data and sends it to the human-computer interaction module for display on the UI interface.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a portable detection device for the crispness of fragrant pear flesh. By collecting force-sound signals when the fragrant pear flesh is punctured, a detection model for the crispness of fragrant pear flesh is constructed. The device has the advantages of accuracy, portability, and speed, and solves the problems of slow detection time, large size, and high cost of detection equipment currently on the market. The device can also evaluate the crispness of the fragrant pear flesh, increase the commercial rate of the fragrant pear, and screen excellent varieties. It provides convenience for real-time detection to meet the needs of merchants and detection departments, and provides technical support for portable intelligent detection of the crispness of fragrant pears, which is of great significance to the development of the Xinjiang fragrant pear industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of the present invention;

[0023] Figure 2 An exploded view of the sensing component of the present invention;

[0024] Figure 3 An exploded view of the puncture assembly of the present invention;

[0025] Figure 4 An exploded view of the housing of the present invention;

[0026] Figure 5 The schematic diagram of the signal conditioning circuit of the mechanical sensor of the present invention;

[0027] Figure 6 is a schematic diagram of a signal conditioning circuit for an acoustic sensor of the present invention;

[0028] Figure 7 is a schematic diagram of a battery management circuit of the present invention;

[0029] Figure 8 is a schematic diagram of an ADC circuit of the present invention;

[0030] Fig. 9 It is a schematic diagram of the motor drive circuit of the present invention.

[0031] Among them, in the figure:

[0032] 1-Punch assembly, 2-Sensing assembly, 3-Housing, 4-PCB board, 5-Button, 6-Touch screen, 7-First M3 screw, 8-M4 screw, 9-Force sensor bracket, 10-Mechanical sensor, 11-Acoustic sensor bracket, 12-Second M3 screw, 13-Punch probe, 14-Probe mounting plate, 15-Acoustic sensor, 16-Stepper motor, 17-Stepper motor bracket, 18-M2 screw, 19-Sample support, 20-M2.5 nut, 21-Rear panel, 22-Upper panel, 23-Left panel, 24-M1.6 screw, 25-Partition, 26-Front panel, 27-Connecting profile, 28-Lower panel, 29-Right panel, 30-Interface buckle. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] refer to Figure 1-4 The present invention provides a portable pear pulp crispness detection device, comprising: a mechanical system, a hardware circuit system and a software control system, wherein the hardware circuit system is installed on the mechanical system and electrically connected to the mechanical system, and the software control system is communicatively connected to the hardware circuit system, the mechanical system comprises a puncture component 1, a sensing component 2 and a shell 3, the puncture component 1 and the sensing component 2 are both arranged inside the shell 3 by a first M3 screw 7, and the puncture component 1 is fixedly mounted on the sensing component 2, the puncture component 1 is used to complete the puncture of the sample, and the sensing component 2 is used to sense the puncture condition of the puncture component.

[0035] The sensing assembly 2 includes: a mechanical sensor 10, a force sensor bracket 9, an acoustic sensor 15, an acoustic sensor bracket 11, a probe mounting plate 14 and a puncture probe 13; the top end of the mechanical sensor 10 is mounted on the force sensor bracket 9 by an M4 screw 8, and the bottom end is mounted on the acoustic sensor bracket 11 by an M4 screw 8; the acoustic sensor 15 is mounted inside the acoustic sensor bracket 11 and close to the puncture probe 13; the puncture probe 13 is connected to the probe mounting plate 14 and connected to the acoustic sensor bracket 11 by a second M3 screw 12; the end face of the puncture probe 13 contacts the ceramic coupling surface of the acoustic sensor 15 to ensure the sensing signal.

[0036] The puncture assembly 1 includes a stepper motor 16, a stepper motor bracket 17 and a sample support 19; two stepper motor brackets 17 are provided, which are symmetrically installed on both sides of the acoustic sensor bracket 11 through M2 screws 18, and the two stepper motor brackets 17 are both installed with stepper motors 16. The sample support 19 is located below the stepper motor bracket 17, and both sides are threadedly connected to the retracting push rod installed on the stepper motor 16, and the end of the retracting push rod is installed with an M2.5 nut 20. The power source of the device of the present invention is a fixed-axis linear stepper motor, which is a two-phase four-wire bipolar stepper motor, and the chip TMC2209 that supports subdivision function and has a high degree of integration is selected to achieve higher precision control.

[0037] The shell 3 includes a rear panel 21, an upper panel 22, a left panel 23, M1.6 screws 24, a partition 25, a front panel 26, a connecting profile 27, a lower panel 28, a right panel 29 and an interface buckle 30; the rear panel 21, the left panel 23, the front panel 26, the lower panel 28 and the right panel 29 are surrounded by M1.6 screws 24 to form a box body with an opening, the upper panel 22 is installed on one side of the opening, the connecting profile 27 is installed between the bottom sides of the left panel 23 and the bottom sides of the right panel 29, the partition 25 is installed inside the box body to divide the inside of the box body into a front accommodating chamber and a rear accommodating chamber, and the interface buckle 30 is installed on the outside of the right panel 29.

[0038] The hardware circuit system includes a PCB board 4, a control board memory and a touch screen 6. The PCB board 4 and the control board memory are arranged inside the rear accommodating cavity, and the control board memory is electrically connected to the PCB board 4. The touch screen 6 is installed on the other side of the box body opening and is electrically connected to the PCB board. A button 5 is installed on the upper panel 22.

[0039] The PCB board includes a control board and a power board; the control board includes an MCU, a power input interface, an MPU connection port, a motor drive circuit, a power conversion circuit, an acoustic sensor signal amplification circuit, a mechanical sensor signal amplification circuit and an ADC circuit; the MCU is electrically connected to the power input interface, the MPU connection port, the motor drive circuit, the power conversion circuit, the acoustic sensor signal amplification circuit, the mechanical sensor signal amplification circuit and the ADC circuit respectively; the power board includes a switch interface, a charging interface, a power output interface, a 12V boost circuit and a power management circuit; the power management circuit is electrically connected to the switch interface, the charging interface, the power output interface and the 12V boost circuit respectively. The power supply uses a 18650 lithium battery. When the battery is fully charged, the open circuit voltage is about 4.2V, which will gradually decrease as the power is lost. When the power is zero, the open circuit voltage is about 3.0V.

[0040] The mechanical sensor signal conditioning circuit includes a first-level mechanical sensor signal amplification circuit composed of an AD620 high-precision instrument amplifier, capacitor C1, capacitor C2, resistor R1, resistor R2, diode D1, diode D2, magnetic bead FB1, and magnetic bead FB2; a mechanical sensor filter circuit composed of capacitor C3, capacitor C4, resistor R3, and resistor R4; and a second-level mechanical sensor signal amplification circuit composed of an OP07 precision operational amplifier, resistor R5, resistor R6, capacitor C5, and capacitor C6.

[0041] The acoustic sensor signal conditioning circuit includes an acoustic sensor preamplifier circuit composed of an OP07 operational amplifier, a resistor R7, a resistor R8, a capacitor C7, a capacitor C8, and a capacitor C9; an acoustic sensor signal primary amplifier circuit composed of an OP07 operational amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C12, a capacitor C13, and a capacitor C14; and an acoustic sensor signal secondary amplifier circuit composed of an OP07 operational amplifier, a resistor R18, a resistor R19, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C26.

[0042] The battery management circuit includes a battery protection circuit composed of a DW01 battery protection chip and an 8205A MOS field effect and a charge and discharge management circuit designed by a SW6106 charge and discharge management chip, wherein the 21, 22, and 23 pins of the SW6106 charge and discharge management chip are respectively connected to the SW6106_SCK, SW6106_SDA, and SW6106_IRQ networks; the 5V power supply of the power management output circuit is connected to the +5 network.

[0043] The operational amplifier power supply uses the TPS61080 switching regulator, and the feedback resistors R27 and R28 are changed according to the positive and negative power supply circuits given in the design manual.

[0044] The ADC circuit uses the AD7606 ADC chip, the communication method is serial communication, and the communication line and the control signal line are connected in series with resistors to match the impedance.

[0045] The motor drive circuit uses the TMC2209 motor drive chip. According to the chip application circuit in the TMC2209 motor drive chip design reference manual, the working mode of the motor drive chip is set to the silent chopping mode; the MP3429GL DC-DC chip is used to output the voltage of the power management circuit to meet the motor voltage supply.

[0046] The software control system is divided into a lower computer software system and an upper computer software system; the lower computer software system runs in the MCU, including an instruction receiving module, a puncture process control module, a motor operation control module and a mechanical sensor overload protection module; the upper computer software system runs in the MPU, including a human-computer interaction module, a data receiving module and a brittleness calculation module; the instruction receiving module is responsible for receiving instructions sent by the human-computer interaction module; the puncture process control module calls the motor operation control module to realize the control of the probe puncturing the pulp process, and sends the force and sound data during the puncture to the data receiving module; the mechanical sensor overload protection module realizes overload protection of the mechanical sensor.

[0047] The human-computer interaction module realizes human-computer interaction through the UI interface and sends control instructions to the instruction receiving module; the data receiving module is responsible for receiving the force and sound data during the puncture process; the brittleness calculation module calculates the brittleness value based on the force and sound data and sends it to the human-computer interaction module for display on the UI interface.

[0048] The present invention provides a portable fragrant pear flesh crispness detection device, which constructs a fragrant pear flesh crispness detection model by collecting force-sound signals when the fragrant pear flesh is pierced, and has the advantages of accuracy, portability, and rapidity, and solves the problems of slow detection time, large volume, and high cost of detection equipment on the current market; and can realize the crispness evaluation of the internal flesh of the fragrant pear, improve the commodity rate of the fragrant pear and screen excellent varieties, provide convenience for real-time detection, meet the use of merchants and detection departments, and provide technical support for portable intelligent detection of the crispness of the fragrant pear, which is of great significance to the development of the Xinjiang fragrant pear industry. In addition, the present invention is of great significance to improving the grade and commodity rate of the fragrant pear, establishing the brand, and enhancing the market competitiveness by accurately and effectively detecting the important internal quality of the crispness of the fragrant pear.

[0049] The working principle of the portable fragrant pear pulp crispness detection device of the present invention is:

[0050] Place the pear pulp column sample on the tray. When the user clicks on the human-computer interaction interface to trigger the detection task, the MPU sends a detection command to the MCU. The MCU controls the motor to drive the tray to move upward from the initial position at a uniform speed of 2mm / s. At the same time, the MCU starts timing and obtains the sensor signal force value Ft in real time through the ADC. When Ft is greater than the minimum measurable force of the mechanical sensor of 0.05N, it indicates that the sample has contacted the end face of the puncture probe. The MCU then begins to cache the acquired force and sound data in real time into the RAM. When the puncture depth is 8mm, the MCU begins to send the data in the RAM to the MPU. The MPU enters the received data into the memory. At the same time, the tray has returned to the initial position. The MCU turns off the motor and continues to wait for the data in the RAM to be sent. After the MCU detects that all the data in the RAM has been sent, it sends an end command to the MPU. After receiving the command, the MPU starts data processing and calculation, and the calculation results are displayed on the human-computer interaction interface.

[0051] like Figure 5 As shown in the figure, the mechanical sensor conditioning circuit includes the AD620 chip and the mechanical sensor signal first-stage amplification circuit composed of resistors, diodes, and magnetic beads; the mechanical sensor signal conditioning circuit composed of a second-order π-type RC passive low-pass filter circuit; and the resistor R1 is used to adjust the amplification factor. 0.1μF capacitors C1 and C2 are added to the chip power pin to prevent excessive noise from the input power supply.

[0052] First-stage amplification circuit of mechanical sensor signal: Two diodes D1 and D2 with opposite directions are connected in parallel before the amplifier input to protect the chip. Magnetic beads FB1 and FB2 are added before entering the first-stage amplification to prevent high-frequency noise from entering the amplifier.

[0053] The mechanical sensor signal conditioning circuit uses a second-order π-type RC passive low-pass filter circuit for filtering.

[0054] The secondary amplifier circuit of the mechanical sensor signal adopts a common-phase operational amplifier circuit, powered by a ±15V power supply, and adds a feedback capacitor C24 to compensate for the phase. At the same time, 0.1μF capacitors C5 and C6 are added to the power pin of the chip to prevent excessive noise from the input power supply.

[0055] like Figure 6 As shown in the figure, the first-stage amplifier circuit of the acoustic sensor signal adopts a differential amplifier circuit. In order to prevent common-mode noise and improve the strength and clarity of the signal, a 1nF capacitor C12 is connected in parallel with the feedback resistor R11 for compensation. In addition, a ±15V power supply is used, and 0.1μF capacitors C13 and C14 are added to the chip power pin to prevent excessive input noise.

[0056] The acoustic sensor filter circuit uses a Butterworth low-pass active filter to obtain a more linear gain. The filter is selected as a two-stage fourth-order filter to save space and make the noise decay faster.

[0057] The secondary amplifier circuit of the acoustic sensor adopts a unidirectional operational amplifier circuit. The acoustic signal is a dynamic signal. When there is a phase lag in the feedback loop, it will cause phase shift in signals in certain frequency bands. It is also necessary to add feedback capacitors to compensate for the phase. It uses a ±15V power supply for power supply. At the same time, 0.1μF capacitors C25 and C26 are added to the power pins of the chip to prevent excessive noise from the input power supply.

[0058] like Figure 7 As shown, to avoid over-discharge and over-charge of the battery, the DW01 battery protection chip, 8205A MOS field effect tube, 1kΩ current limiting resistor R1, 2.2kΩ sampling resistor R2, and 0.1μF decoupling capacitor C1 are selected to form a battery protection circuit. The 8205A is composed of two N-MOS field effect tubes Q1 and Q2 connected to the drain. The DW01 battery protection chip monitors the battery voltage value and turns on or off the 8205A MOS field effect tube connected to the circuit according to the battery voltage, thereby preventing the battery from being overcharged and over-discharged. The SW6106 charge and discharge management chip is used to manage the power supply, and a small 2.2uH inductor is used to boost the voltage.

[0059] The TPS61080 switching regulator is designed for operational amplifier power supply. It can generate bipolar power supply with fewer components. The switching frequency of the regulator is up to 1.2MHz. It integrates power switch, I / O isolation switch and power diode, which is suitable for power supply design of operational amplifier.

[0060] like Figure 8 As shown, the ADC circuit adopts AD7606 ADC chip, which has high integration and adopts serial communication.

[0061] The AD7606 chip has a multi-channel synchronous sampling function. The MCU reads the sampled data starting from the first analog input channel V1. Therefore, the signal output by the sensor signal conditioning circuit is connected to the first and second analog input channels V1 and V2 of the chip, as shown in the 49th and 51st pins of the AD7606 chip.

[0062] In addition to data transmission between the ADC and the subsequent stage, there are other control signals such as sampling settings, start triggering, ADC reset, ADC busy, etc. transmitted through ordinary IO. When the ADC and the subsequent MCU communicate and transmit control signals, the edge signal may be reflected between the communication links due to impedance mismatch, and the stability is poor. Therefore, the communication line and the control signal line are connected in series with 51Ω resistors R35, R36, and R37 to match the impedance, reduce the steepness of the signal edge, and improve stability.

[0063] like Fig. 9 The motor drive circuit uses the TMC2209 motor drive chip. The 7th pin of the chip is changed to the low-level AGND and set to the silent chopping mode. The 9th and 10th pins are changed to the AGND and 3.3V networks respectively, that is, they are set to the highest subdivision value of 64.

[0064] The acoustic data is filtered by spectral subtraction, and then the characteristic parameters are extracted from the mechanical data and acoustic data respectively, and the four principal components are calculated. Finally, the brittleness value Y is calculated according to the linear regression equation and sent to the human-computer interaction module, which displays the brittleness value on the touch screen.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A portable pear pulp crispness detection device, characterized in that: include: A mechanical system, a hardware circuit system and a software control system, wherein the hardware circuit system is mounted on the mechanical system and electrically connected to the mechanical system, and the software control system is communicatively connected to the hardware circuit system. The mechanical system comprises a puncture component (1), a sensing component (2) and a housing (3). The puncture component (1) and the sensing component (2) are both arranged inside the housing (3) by a first M3 screw (7), and the puncture component (1) is fixedly mounted on the sensing component (2). The puncture component (1) is used to complete the puncture of a sample, and the sensing component (2) is used to sense the puncture condition of the puncture component.

2. A portable pear pulp crispness detection device according to claim 1, characterized in that: The sensing assembly (2) comprises: a mechanical sensor (10), a force sensor bracket (9), an acoustic sensor (15), an acoustic sensor bracket (11), a probe mounting plate (14) and a puncture probe (13); the top end of the mechanical sensor (10) is mounted on the force sensor bracket (9) by an M4 screw (8), and the bottom end is mounted on the acoustic sensor bracket (11) by an M4 screw (8); the acoustic sensor (15) is mounted inside the acoustic sensor bracket (11) and close to the puncture probe (13); the puncture probe (13) is connected to the probe mounting plate (14) and connected to the acoustic sensor bracket (11) by a second M3 screw (12); the end face of the puncture probe (13) contacts the ceramic coupling surface of the acoustic sensor (15) to ensure the sensing signal.

3. A portable pear pulp crispness detection device according to claim 2, characterized in that: The puncture assembly (1) comprises a stepper motor (16), a stepper motor bracket (17) and a sample support table (19); two stepper motor brackets (17) are provided, which are symmetrically mounted on both sides of the acoustic sensor bracket (11) by means of M2 screws (18); a stepper motor (16) is mounted on each of the two stepper motor brackets (17); the sample support table (19) is located below the stepper motor bracket (17), and both sides are threadedly connected to a retractable push rod mounted on the stepper motor (16); an M2.5 nut (20) is mounted on the end of the retractable push rod.

4. A portable pear pulp crispness detection device according to claim 3, characterized in that: The housing (3) comprises a rear panel (21), an upper panel (22), a left panel (23), M1.6 screws (24), a partition (25), a front panel (26), a connecting profile (27), a lower panel (28), a right panel (29) and an interface buckle (30); the rear panel (21), the left panel (23), the front panel (26), the lower panel (28) and the right panel (29) are surrounded by M1.6 screws (24) to form a box body with an opening, the upper panel (22) is installed on one side of the opening, the connecting profile (27) is installed between the bottom side of the left panel (23) and the bottom side of the right panel (29), the partition (25) is installed inside the box body to divide the inside of the box body into a front accommodating chamber and a rear accommodating chamber, and the interface buckle (30) is installed on the outside of the right panel (29).

5. A portable pear pulp crispness detection device according to claim 4, characterized in that: The hardware circuit system comprises a PCB board (4), a control board memory and a touch screen (6); the PCB board (4) and the control board memory are arranged inside the rear accommodating cavity, and the control board memory is electrically connected to the PCB board (4); the touch screen (6) is installed on the other side of the box body opening and is electrically connected to the PCB board; and a button (5) is installed on the upper panel (22).

6. A portable pear pulp crispness detection device according to claim 5, characterized in that: The PCB board includes a control board and a power board; The control board includes an MCU, a power input interface, an MPU connection port, a motor drive circuit, a power conversion circuit, an acoustic sensor signal amplification circuit, a mechanical sensor signal amplification circuit and an ADC circuit; the MCU is electrically connected to the power input interface, the MPU connection port, the motor drive circuit, the power conversion circuit, the acoustic sensor signal amplification circuit, the mechanical sensor signal amplification circuit and the ADC circuit respectively; The power board includes a switch interface, a charging interface, a power output interface, a 12V boost circuit and a power management circuit; the power management circuit is electrically connected to the switch interface, the charging interface, the power output interface and the 12V boost circuit respectively.

7. A portable pear pulp crispness detection device according to claim 6, characterized in that: The mechanical sensor signal conditioning circuit includes a first-level mechanical sensor signal amplification circuit composed of an AD620 high-precision instrument amplifier, capacitor C1, capacitor C2, resistor R1, resistor R2, diode D1, diode D2, magnetic bead FB1, and magnetic bead FB2; a mechanical sensor filter circuit composed of capacitor C3, capacitor C4, resistor R3, and resistor R4; and a second-level mechanical sensor signal amplification circuit composed of an OP07 precision operational amplifier, resistor R5, resistor R6, capacitor C5, and capacitor C6.

8. A portable pear pulp crispness detection device according to claim 7, characterized in that: The acoustic sensor signal conditioning circuit includes an acoustic sensor preamplifier circuit composed of an OP07 operational amplifier, a resistor R7, a resistor R8, a capacitor C7, a capacitor C8, and a capacitor C9; an acoustic sensor signal primary amplifier circuit composed of an OP07 operational amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C12, a capacitor C13, and a capacitor C14; and an acoustic sensor signal secondary amplifier circuit composed of an OP07 operational amplifier, a resistor R18, a resistor R19, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C26.

9. A portable pear pulp crispness detection device according to claim 8, characterized in that: The battery management circuit includes a battery protection circuit composed of a DW01 battery protection chip and an 8205A MOS field effect and a charge and discharge management circuit designed by a SW6106 charge and discharge management chip, wherein the 21, 22, and 23 pins of the SW6106 charge and discharge management chip are respectively connected to the SW6106_SCK, SW6106_SDA, and SW6106_IRQ networks; the 5V power supply of the power management output circuit is connected to the +5 network.

10. A portable pear pulp crispness detection device according to claim 9, characterized in that: The software control system is divided into a lower computer software system and a host computer software system; The lower computer software system runs in the MCU, including a command receiving module, a puncture process control module, a motor operation control module and a mechanical sensor overload protection module; the upper computer software system runs in the MPU, including a human-computer interaction module, a data receiving module and a brittleness calculation module; The instruction receiving module is responsible for receiving the instructions sent by the human-computer interaction module; the puncture process control module calls the motor operation control module to realize the control of the probe puncturing the pulp process, and sends the force and sound data during the puncture to the data receiving module; The mechanical sensor overload protection module realizes overload protection for the mechanical sensor. The human-computer interaction module realizes human-computer interaction through the UI interface and sends control instructions to the instruction receiving module; The data receiving module is responsible for receiving the force and sound data during the puncture process; The brittleness calculation module calculates the brittleness value based on the force-sound data and sends it to the human-computer interaction module for display on the UI interface.

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