A microcomputer control panel for a dough mixer

Abstract

The utility model relates to a kind of flour mixing machine microcomputer control panel, belong to food processing equipment control technical field.The control panel includes panel shell, main control circuit board, first rotary encoder, second rotary encoder, display module, temperature acquisition circuit structure, serial communication interface circuit structure and isolation power supply circuit structure.Wherein, first rotary encoder is used to input timing adjustment signal by rotating operation;Second rotary encoder is used to input speed adjustment signal by rotating operation, and input start-stop control signal and jog reverse control signal by pressing operation;Display module includes LCD display screen and display drive circuit, for real-time display operating parameter;Temperature acquisition circuit structure includes ADC conversion unit and the interface of connecting external thermistor sensor.The utility model compact structure, easy operation, realize multiple function control by two rotary encoders, improve the operation convenience and security of flour mixing machine.

Description

Technical Field

[0001] This utility model relates to the field of dough mixer technology, specifically a microcomputer control panel for a dough mixer. Background Technology

[0002] With the continuous development of food processing machinery, dough mixers, as important equipment in pasta processing, directly impact the user experience and processing efficiency through the intelligence and user-friendliness of their control systems. Currently, dough mixer control systems on the market mainly adopt mechanical speed regulation or simple digital control methods, and there is still significant room for improvement in areas such as human-machine interaction, temperature monitoring, and speed regulation accuracy.

[0003] The existing dough mixer control systems suffer from the following main problems: Traditional mechanical potentiometer and mechanical button speed control methods lack human-machine interaction, dynamic display, and data acquisition functions, failing to provide users with intuitive operational feedback; speed control systems using digital tube button panels have complex PCB designs and numerous interface buttons, increasing the learning cost for users; in application scenarios lacking proper grounding, industrial control displays are prone to interference, resulting in lag or crashes, affecting the stable operation of the equipment; existing systems lack data acquisition stability and communication reliability in environments with strong electromagnetic interference, easily leading to data fluctuations and communication failures; finally, the operating interface of existing control systems is relatively complex, making it difficult for users to understand the functions and start using them immediately upon first contact.

[0004] Therefore, there is an urgent need to develop a continuously variable speed microcomputer control system with temperature acquisition function. This system should have a good human-machine interface, stable data acquisition capability, reliable communication function, and simple and easy-to-use operation mode to meet the high requirements of modern dough mixers for control systems. Utility Model Content

[0005] The purpose of this invention is to provide a microcomputer control panel for a dough mixer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a microcomputer control panel for a dough mixer, comprising:

[0007] Panel housing;

[0008] A main control circuit board is disposed inside the panel housing, and a main control chip is disposed on the main control circuit board;

[0009] The first rotary encoder is installed on the panel housing, with its rotating shaft exposed for user operation. Its signal output terminal is electrically connected to the main control chip and is used to input timing adjustment signals through rotation operation.

[0010] The second rotary encoder is installed on the panel housing, with its rotating shaft exposed for user operation. Its rotation signal output terminal and key signal output terminal are both electrically connected to the main control chip, used to input speed adjustment signals through rotation operation, and input start / stop control signals and jog reverse control signals through pressing operation.

[0011] The display module includes an LCD display screen mounted on the panel housing and a display driving circuit disposed on the main control circuit board, wherein the display driving circuit is electrically connected to the main control chip and the LCD display screen.

[0012] The temperature acquisition circuit structure, set on the main control circuit board, includes an ADC conversion unit and an interface for connecting an external thermistor sensor. The ADC conversion unit is electrically connected to the main control chip.

[0013] A serial communication interface circuit structure is set on the main control circuit board and electrically connected to the main control chip, used for data communication with an external motor drive motherboard;

[0014] An isolated power supply circuit structure is installed on the main control circuit board to provide power to the main control chip, display driver circuit, and temperature acquisition circuit structure.

[0015] In one feasible implementation, both the first rotary encoder and the second rotary encoder are EC11 type rotary encoders with self-reset buttons.

[0016] In one feasible implementation, the key signals of the second rotary encoder are configured by the main control chip to send a stop command when pressed briefly and a motor reverse command when pressed for a long time.

[0017] In one feasible implementation, the temperature acquisition circuit structure further includes a signal conditioning circuit connected to the input terminal of the ADC conversion unit, which is used to convert the resistance change of the thermistor sensor into a stable voltage signal.

[0018] In one feasible implementation, the display module is configured to display at least one of the following in real time: motor operating frequency, set timer duration, real-time temperature acquisition, switch status, communication status, or fault information.

[0019] In one feasible implementation, the isolated power supply circuit structure adopts an isolated DC-DC power module or a transformer isolation circuit.

[0020] In one feasible implementation, the exposed control elements of the panel housing include the first rotary encoder, the second rotary encoder, and the LCD display.

[0021] In one feasible implementation, the main control circuit board is provided with a serial communication interface, a temperature sensor interface, and a switch signal interface, which are used to connect to an external motor drive motherboard, a temperature sensor, and a switch signal harness, respectively.

[0022] Compared with existing technologies, the beneficial effects of this utility model are as follows: This device achieves stepless speed regulation by replacing traditional mechanical potentiometers and buttons with two rotary encoders, preventing the failure problem of traditional speed regulation devices with limit potentiometers being twisted off by rotation; it simplifies the operation interface, requiring only two EC11 encoders to achieve all the functions of a traditional control panel, making it easier for users to understand and use; it adopts an isolated power supply design and a high-performance microcontroller, improving anti-interference capabilities and solving the problems of data acquisition fluctuations and communication failures in strong electromagnetic interference scenarios; it displays the operating status in real time on an LCD screen, realizing real-time feedback from the human-machine interface, facilitating after-sales service and users to understand the machine status and improving the efficiency of troubleshooting; the EC11 sends signals in pulse form, which can accurately send fixed frequencies, making the motor output speed more accurate; the isolated power supply design effectively avoids the problem of induced electrical interference in scenarios where mechanical equipment is not connected to a ground wire. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a pin diagram of the main control chip in this utility model;

[0025] Figure 3 This is a circuit diagram of the second rotary encoder in this utility model;

[0026] Figure 4 This is a circuit diagram of the first rotary encoder in this utility model;

[0027] Figure 5 This is a circuit diagram of the temperature acquisition circuit structure in this utility model.

[0028] In the diagram: 10, panel housing; 20, main control circuit board; 30, first rotary encoder; 40, second rotary encoder; 50, display module. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 5As shown, a microcomputer control panel for a dough mixer includes a panel housing 10, a main control circuit board 20, a first rotary encoder 30, a second rotary encoder 40, a display module 50, a temperature acquisition circuit structure, a serial communication interface circuit structure, and an isolated power supply circuit structure.

[0031] The panel housing 10 is made of engineering plastic injection molding, which has good heat resistance and mechanical strength. The housing thickness is 2.5mm. The front side of the panel housing 10 has an opening for installing an LCD display and a rotary encoder, and the back side has mounting holes and wiring holes for easy fixing to the dough mixer and connection to external circuits.

[0032] The main control circuit board 20 is located inside the panel housing 10 and is made of double-sided copper-clad board. The main control circuit board 20 houses the main control chip, which is an ultra-high-speed 1T 8051 core Flash MCU (such as the STC15 series). This chip is based on the ARM Cortex-M3 core, operates at a frequency of 72MHz, and has 64KB of flash memory and 20KB of RAM. It provides rich peripheral interfaces including GPIO, UART, SPI, I2C, and ADC, meeting the various functional requirements of the control panel. The main control chip is electrically connected to other components on the circuit board through four layers of PCB wiring. The signal lines adopt a differential routing design to reduce electromagnetic interference.

[0033] The first rotary encoder 30 is mounted on the upper part of the panel housing 10. It is an EC11 type rotary encoder with a self-reset button. The rotating shaft is exposed for user operation, and a plastic knob with a diameter of 15mm and a height of 10mm is installed on the rotating shaft for easy rotation. The A-phase signal, B-phase signal, and common terminal of the first rotary encoder 30 are connected to a 5V power supply through 10kΩ pull-up resistors, and are electrically connected to the GPIO ports PA0 and PA1 of the main control chip through signal lines. The first rotary encoder 30 is used to input timing adjustment signals through rotation. Each rotation pulse adjusts the timing time by 1 minute. Clockwise rotation increases the time, and counterclockwise rotation decreases the time. The adjustment range is 0-45 minutes to meet the time control requirements within 45 minutes in a typical dough kneading process.

[0034] The second rotary encoder 40 is installed below the panel housing 10. It is also an EC11 type rotary encoder with a self-reset button. The exposed rotating shaft is for user operation, and a 15mm diameter, 10mm high knob is mounted on the shaft for easy rotation and pressing. The A-phase signal, B-phase signal, and common terminal of the second rotary encoder 40 are connected to a 5V power supply via 10kΩ pull-up resistors and electrically connected to the GPIO ports PA2 and PA3 of the main control chip via signal lines. Its button signal output terminal is connected to a 5V power supply via a 10kΩ pull-up resistor and electrically connected to the GPIO port PA4 of the main control chip via a signal line. The second rotary encoder is used to input speed adjustment signals through rotation, controlling the motor's operating speed. The rotation operation corresponds to 10 speed levels; clockwise rotation switches to a higher speed, and counterclockwise rotation switches to a lower speed. Each speed level corresponds to a different output frequency to achieve segmented stepless speed regulation. Simultaneously, the press operation inputs start / stop control signals and jog / reverse control signals; a short press sends a stop command, and a long press sends a motor reverse command. The main control chip uses software algorithms to identify the short press and long press states of the button. A short press is defined as a press time of less than 1 second, and a long press is defined as a press time of more than or equal to 1 second.

[0035] The display module 50 includes an LCD display screen mounted on the panel housing 10 and a display driver circuit mounted on the main control circuit board 20. The LCD display screen is a segment LCD screen, controlled by a dedicated HT1621 driver chip. The display driver circuit is mounted on the main control circuit board 20 and includes an ST7735S display controller chip and related circuit components. The display driver circuit is electrically connected to the PA5 (SCK), PA6 (MISO), PA7 (MOSI), and PB0 (CS) ports of the main control chip via an SPI interface. Simultaneously, the backlight control terminal of the LCD display screen is controlled via the PB1 port, and the reset terminal is controlled via the PB10 port. The display module 50 is configured to display the motor operating frequency, set timer, real-time temperature, on / off status, communication status, and fault information in real time. The display interface is divided into four areas: the upper area displays the set timer, with the default unit being minutes, and a display range of 0-45 minutes, for example, displaying "Timer: 45:00min". The middle area displays the current motor operating gear, supporting ten adjustable levels from 00 to 09, used to indicate the current workload. The lower left area displays the real-time temperature, with a measurement range of -9.0℃ to 99.9℃, enabling temperature detection and monitoring in a wider range of environments. The lower right area displays the switch status, communication status, and fault information, including status information such as running, stopped, normal communication, communication error, overheating, and overload.

[0036] The temperature acquisition circuit is mounted on the main control circuit board 20 and includes an ADC conversion unit, a signal conditioning circuit, and an interface for connecting an external thermistor sensor. The ADC conversion unit utilizes the built-in ADC module of the main control chip, with a sampling rate set to 10Hz. The signal conditioning circuit is connected to the input of the ADC conversion unit to convert the resistance change of the thermistor sensor into a stable voltage signal. The input of the signal conditioning circuit is connected to the external thermistor sensor via a two-pin connector, and its output is connected to the ADC channel PA5 of the main control chip. This temperature acquisition circuit can convert the resistance change of the thermistor into a 0-5V voltage signal. The main control chip uses a lookup table method to convert the ADC sampled value into the actual temperature value. The temperature measurement range is -9.0℃ to 99.9℃, which can meet the startup monitoring requirements in low-temperature environments and improve the system's adaptability to extreme environments.

[0037] The serial communication interface circuit is located on the main control circuit board 20 and is electrically connected to the main control chip for data communication with the external motor drive motherboard. The communication interface circuit adopts the RS-485 communication standard and includes a MAX485 chip, a 120Ω terminating resistor, and a diode protection circuit. It uses UART serial communication to achieve data interaction with the main control chip, ensuring high-speed and reliable data transmission.

[0038] The TXD and RXD pins of the MAX485 chip are electrically connected to the UART1 transmit port PA9 and receive port PA10 of the main control chip, respectively. The direction control pins DE / RE are controlled through port PA8. The A and B signal lines of the serial communication interface circuit are led out through a three-pin reverse-connector for connecting to an external motor drive motherboard. The communication baud rate is set to 4800bps, using the Modbus-RTU communication protocol. The main control panel acts as the master station, and the motor drive motherboard acts as the slave station. The communication cycle is 100ms. Communication data includes motor operating frequency settings, timing settings, start / stop control commands, reverse control commands, and status query commands.

[0039] An isolated power supply circuit is mounted on the main control circuit board 20 to provide a stable power supply for the main control chip, display driver circuit, and temperature acquisition circuit. The power supply circuit adopts an isolated DC-DC power architecture, with the entire panel system powered by an isolated DC 5V power supply. This 5V power supply originates from the isolation side of the high-frequency transformer on the motor drive board and is generated by a step-down chip (L7805) from the isolated DC 12V, providing excellent electrical isolation and anti-interference performance. The power supply circuit includes filtering and protection circuits to effectively improve the stability and surge protection of the power system. The isolated 5V power supply directly powers the main control chip, LCD display module, communication interface circuit, and temperature acquisition circuit, avoiding the power noise introduced by traditional multi-stage voltage regulation, simplifying the system structure, improving electromagnetic compatibility performance, and ensuring long-term stable operation of the control panel in complex industrial environments.

[0040] The main control circuit board 20 is equipped with a serial communication interface, a temperature sensor interface, and a switch signal interface, used to connect to an external motor drive motherboard, a temperature sensor, and a switch signal harness, respectively. The serial communication interface uses a three-pin reverse-biased connector, including an A signal, a B signal, and a GND ground wire; the temperature sensor interface uses a two-pin reverse-biased connector for connecting an external thermistor sensor; and the switch signal interface uses a four-pin reverse-biased connector, including a start signal, a stop signal, a reverse signal, and a common terminal, used to connect to an external switch signal harness. All these interfaces are located at the edge of the main control circuit board 20 for easy connection to external devices.

[0041] The exposed control components of the panel housing 10 include a first rotary encoder 30, a second rotary encoder 40, and an LCD display. The first rotary encoder 30 is located above the panel housing 10 and is used for timing adjustment; the second rotary encoder 40 is located below the panel housing 10 and is used for speed adjustment and start / stop control; the LCD display is located in the center of the panel housing 10 and is used to display system status information. This layout design conforms to ergonomic principles, is intuitive and easy to operate, and provides a clear and concise display.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microcomputer control panel for a dough mixer, characterized in that, include: Panel housing; A main control circuit board is disposed inside the panel housing, and a main control chip is disposed on the main control circuit board; The first rotary encoder is installed on the panel housing, with its rotating shaft exposed for user operation. Its signal output terminal is electrically connected to the main control chip and is used to input timing adjustment signals through rotation operation. The second rotary encoder is installed on the panel housing, with its rotating shaft exposed for user operation. Its rotation signal output terminal and key signal output terminal are both electrically connected to the main control chip, used to input speed adjustment signals through rotation operation, and input start / stop control signals and jog reverse control signals through pressing operation. The display module includes an LCD display screen mounted on the panel housing and a display driving circuit disposed on the main control circuit board, wherein the display driving circuit is electrically connected to the main control chip and the LCD display screen. The temperature acquisition circuit structure, set on the main control circuit board, includes an ADC conversion unit and an interface for connecting an external thermistor sensor. The ADC conversion unit is electrically connected to the main control chip. A serial communication interface circuit structure is set on the main control circuit board and electrically connected to the main control chip, used for data communication with an external motor drive motherboard; An isolated power supply circuit structure is installed on the main control circuit board to provide power to the main control chip, display driver circuit, and temperature acquisition circuit structure.

2. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: Both the first and second rotary encoders are EC11 type rotary encoders with self-reset buttons.

3. The microcomputer control panel of the dough mixer according to claim 2, characterized in that: The key signals of the second rotary encoder are configured by the main control chip to send a stop command when pressed briefly and a motor reverse command when pressed for a long time.

4. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: The temperature acquisition circuit structure also includes a signal conditioning circuit, which is connected to the input terminal of the ADC conversion unit and is used to convert the resistance change of the thermistor sensor into a stable voltage signal.

5. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: The display module is configured to display at least one of the following in real time: motor operating frequency, set timer, real-time temperature, switch status, communication status, or fault information.

6. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: The isolated power supply circuit structure adopts an isolated DC-DC power module or a transformer isolation circuit.

7. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: The exposed control components of the panel housing include the first rotary encoder, the second rotary encoder, and the LCD display.

8. The microcomputer control panel of the dough mixer according to claim 1, characterized in that: The main control circuit board is equipped with a serial communication interface, a temperature sensor interface, and a switch signal interface, which are used to connect to an external motor drive motherboard, a temperature sensor, and a switch signal harness, respectively.

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