A multifunctional screw pump point glue control system

Abstract

The application discloses a multifunctional screw pump point glue control system and relates to the technical field of point glue valve control. The MCU data processing circuit comprises a data processing chip U11, the point glue valve control circuit comprises a driving IC connected to the data processing chip U11 and a MOS tube connected to the driving IC, the data processing chip U11 is used for outputting complementary PWM control to the driving IC, the MOS tube is used for switching the power supply and controlling the motor of the point glue valve, the signal input end of the ADC sampling circuit is connected to the point glue valve control circuit, and the signal output end is connected to the data processing chip U11; the current of the motor during operation is sampled in real time so as to detect whether the current of the point glue exceeds a normal value; the application has the beneficial effects that feedback detection of the screw point glue valve can be realized, and accurate control of the output of the screw point glue valve can be realized.

Description

Technical Field

[0001] This invention relates to the field of dispensing control technology, and more specifically, to a multifunctional screw pump dispensing control system. Background Technology

[0002] In the dispensing industry, different dispensing processes are required for different dispensing operations. Screw pump dispensing valves, designed based on screw pumps, offer high precision and the ability to handle high-viscosity adhesives. They are particularly effective for handling small volumes of adhesive. Pneumatic dispensing valves, which rely primarily on air pressure control, are not ideal for small-volume applications; they are especially challenging for high-viscosity adhesives. Screw pump dispensing valves, designed based on the principle of screw pump control, excel in applications requiring small volumes. Furthermore, screw pump dispensing valves can easily accommodate the mixing of two different adhesives to meet various requirements.

[0003] Currently, most screw dispensing valves use DC motors or servo dispensing, which lack effective feedback detection. The output accuracy of screw dispensing valves is difficult to control, and the lack of feedback after output can easily lead to discrepancies between theoretical and actual output. Furthermore, the controllers are often limited in function, requiring different controllers for different functions, resulting in high operating costs and inconvenience. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a multifunctional screw pump dispensing control system.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a multi-functional screw pump dispensing control system, the improvement of which is that it includes an MCU data processing circuit, an ADC sampling circuit and a dispensing valve control circuit;

[0006] The MCU data processing circuit includes a data processing chip U11, and the dispensing valve control circuit includes a driver IC connected to the data processing chip U11 and a MOS transistor connected to the driver IC. The data processing chip U11 outputs a complementary PWM to control the driver IC, which drives the MOS transistor to switch the power supply and control the motor of the dispensing valve.

[0007] The signal input terminal of the ADC sampling circuit is connected to the dispensing valve control circuit, and the signal output terminal is connected to the data processing chip U11. By sampling the current of the motor in real time, it can detect whether the dispensing current exceeds the normal value.

[0008] In the above structure, the multi-functional screw pump dispensing control system also includes an encoder circuit. The encoder is connected between the motor of the dispensing valve and the data processing chip U11. By identifying the encoder signal of the motor, the output status of the motor is determined, and the output data and setting data are compared to modulate the output status of the motor.

[0009] In the above structure, the encoder circuit includes an encoder chip, and the encoder chip model is AM26L32ACDR.

[0010] In the above structure, the data processing chip U11 is model STM32F071VBT6.

[0011] In the above structure, the data processing chip U11 has a memory module inside, which includes a memory chip U12, and the memory chip U12 is model AT24C64. The memory module is used to store and back up the dispensing parameters.

[0012] In the above structure, the driving IC of the dispensing valve control circuit includes driver U6 and driver U7. The dispensing valve control circuit also includes an H-bridge driving circuit located between driver U6 and driver U7. The H-bridge driving circuit includes multiple MOSFETs and controls the motor of the dispensing valve through the H-bridge driving circuit.

[0013] In the above structure, the multi-functional screw pump dispensing control system also includes a power supply circuit, which includes a 24V DC power supply, a 12V DC power supply, a 5V DC power supply and a 3.3V DC power supply.

[0014] In the above structure, the multi-functional screw pump dispensing control system also includes a pressure sensor detection circuit connected to the data processing chip U11. The pressure sensor detection circuit includes an operational amplifier U15, and the operational amplifier U15 is an LMV324. The pressure of the dispensing valve is detected by the pressure sensor detection circuit.

[0015] In the above structure, the multi-functional screw pump dispensing control system also includes a communication circuit connected to the data processing chip U11. The communication circuit includes an isolation transceiver module U4, and the isolation transceiver module U4 is model TD331S232H.

[0016] In the above structure, the multi-functional screw pump dispensing control system also includes an optocoupler isolated input circuit and an optocoupler isolated output circuit. One end of the optocoupler isolated input circuit and the optocoupler isolated output circuit are both connected to the data processing chip U11, and the other end of the optocoupler isolated input circuit and the optocoupler isolated output circuit are both connected to the connector CN13.

[0017] The optically isolated input circuit includes an optocoupler U20, and the optically isolated output circuit includes an optocoupler U19. Both optocoupler U19 and optocoupler U20 are of model PS2805-4.

[0018] In the above structure, the multi-functional screw pump dispensing control system also includes a solenoid valve control circuit and a DIP switch circuit connected to the data processing chip U11.

[0019] The solenoid valve control circuit includes an optocoupler U17, and the optocoupler model is PS2501-1; the DIP switch circuit includes a DIP switch DIP-4.

[0020] In the above structure, the multi-functional screw pump dispensing control system also includes a display circuit connected to the data processing chip U11. The display circuit includes a transceiver chip U1, and the transceiver chip U1 is a MAX3232.

[0021] The beneficial effects of this invention are: it can realize feedback detection of the screw dispensing valve, achieve precise control of the screw dispensing valve output, realize single-component screw dispensing valve control, and realize single-component screw dispensing and spraying functions at the same time; it can also realize the mixing of two kinds of glue in any proportion; it meets the needs of one machine with multiple functions, and one controller realizes multiple functions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a multifunctional screw pump dispensing control system according to the present invention.

[0023] Figure 2 This is a specific embodiment diagram of the MCU data processing circuit in this invention.

[0024] Figure 3 This is a diagram illustrating a specific embodiment of the memory module in this invention.

[0025] Figure 4 This is a specific embodiment diagram of the dispensing valve control circuit in this invention.

[0026] Figure 5 This is a specific embodiment of the ADC sampling circuit in this invention.

[0027] Figures 6 to 11 This is a specific embodiment of the encoder circuit in the present invention.

[0028] Figures 12 to 14 This is a specific embodiment of the power supply circuit in the present invention.

[0029] Figure 15 , Figure 16 This is a specific embodiment of the pressure sensor detection circuit in the present invention.

[0030] Figure 17 This is a specific embodiment diagram of the display screen circuit in the present invention.

[0031] Figure 18This is a specific embodiment of the communication circuit in the present invention.

[0032] Figure 19 This is a specific embodiment diagram of the solenoid valve control circuit in this invention.

[0033] Figure 20 This is a specific embodiment diagram of the DIP switch circuit in this invention.

[0034] Figure 21 This is a specific embodiment of the optocoupler isolated input circuit in this invention.

[0035] Figure 22 This is a specific embodiment of the optocoupler isolated output circuit in this invention. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0038] Reference Figure 1 As shown, this invention discloses a multifunctional screw pump dispensing control system. This system controls the dispensing valve motor and achieves multiple functions through a single controller. For example, it can achieve mixing of two adhesives in any proportion, control a single-component screw dispensing valve, and perform single-component screw dispensing and spraying functions. Specifically, the multifunctional screw pump dispensing control system includes an MCU data processing circuit 101, an ADC sampling circuit 102, and a dispensing valve control circuit 103. The MCU data processing circuit 101 includes a data processing chip U11, and the dispensing valve control circuit 103 includes a driver IC connected to the data processing chip U11 and a MOSFET connected to the driver IC. The data processing chip U11 outputs complementary PWM to control the driver IC, which drives the MOSFET to switch the power supply and control the dispensing valve motor. The complementary PWM ensures that the MOSFETs on the same side will not be simultaneously turned on and damaged. In addition, by changing the direction of the power supply, the forward and reverse rotation of the dispensing valve can be controlled, thereby realizing the dispensing and suction operations.

[0039] This embodiment includes two identical dispensing valve control circuits 103, which control the screw dispensing valve. The screw dispensing valve requires a motor to drive the actuator; therefore, all controllers are designed to control the motor, thus controlling the screw dispensing valve. For ease of description, this embodiment only describes the specific structure of the dispensing valve control circuit 103.

[0040] Furthermore, the signal input terminal of the ADC sampling circuit 102 is connected to the dispensing valve control circuit 103, and the signal output terminal is connected to the data processing chip U11. It detects whether the dispensing current exceeds the normal value by sampling the motor current in real time. Specifically, the motor current is sampled in real time during motor operation to detect whether the dispensing current exceeds the normal value. If it does, an alarm is triggered to prevent stalling and damage to the motor and screw dispensing valve. A sampling resistor is used to convert the current to voltage, which is then amplified by an operational amplifier before being used by the MCU's ADC for identification. The motor is an actuator, and it is difficult to guarantee output accuracy after execution.

[0041] In addition, in this embodiment, the multi-functional screw pump dispensing control system also includes an encoder circuit 104. The encoder is connected between the motor of the dispensing valve and the data processing chip U11. By identifying the encoder signal of the motor, the output status of the motor is determined, and the output data and setting data are compared to modulate the output status of the motor.

[0042] Combination Figures 2 to 5 As shown, the present invention provides a specific embodiment for the MCU data processing circuit 101, the ADC sampling circuit 102, and the dispensing valve control circuit 103. In this embodiment, reference is made to... Figure 2 As shown, the data processing chip U11 is an STM32F071VBT6, a 32-bit Cortex-M0 architecture high-performance embedded microcontroller with abundant on-chip resources. It integrates multiple high-speed ADC functional units, an advanced DMA timer PWM output unit, UART, SPI interface, and other modules, enabling human-machine interaction. It provides high-speed modulation signal output, motor control, and overload protection. Through PWM signal recognition, it achieves functions such as motor encoder acquisition and external dispensing trigger input. Since it is a commonly used chip in this field, its structure will not be described in detail in this embodiment.

[0043] Combination Figure 3As shown, the data processing chip U11 has a memory module 105, which includes a memory chip U12, and the memory chip U12 is an AT24C64. The internal sampling EEPROM memory stores and backs up important parameters, mainly dispensing parameters and the number of dispensing cycles. Even after power failure, the controller retains its important parameters, especially the dispensing parameters, for customer convenience; it eliminates the need to reset parameters every time the controller is powered on.

[0044] Reference Figure 4 The diagram shows a specific embodiment of the dispensing valve control circuit 103. In this embodiment, the driving IC of the dispensing valve control circuit 103 includes driver U6 and driver U7. The dispensing valve control circuit 103 also includes an H-bridge driving circuit located between driver U6 and driver U7. The H-bridge driving circuit includes multiple MOSFETs, and the motor of the dispensing valve is controlled through the H-bridge driving circuit. In this embodiment, both driver U6 and driver U7 are IRS2003, and the multiple MOSFETs include... Figure 4 The MOSFETs Q1, Q2, Q3, and Q4 shown are shown. The dispensing valve control circuit 103 also includes four Zener diodes D6, D7, D10, and D11, which are model SK320A and are connected to the motor through the connector CN4.

[0045] Combination Figure 5 The diagram shows the specific structure of the ADC sampling circuit 102 provided in this embodiment. One end of the ADC sampling circuit 102 is connected to the H-bridge driver circuit, and the other end is connected to the I_SAMPLE pin of chip U11, sending the collected signal to the inside of chip U11. The ADC sampling circuit 102 includes an operational amplifier U8C, and the operational amplifier U8C is an LMV324. Similarly, it should be noted that since the dispensing valve control circuit 103 is designed with two paths, the ADC sampling circuit 102 is also designed with two paths. Since the structure is basically the same, only one path is described in detail in this embodiment. The ADC sampling circuit 102 monitors in real time whether the signal is within a reasonable range, and performs abnormal handling when an anomaly occurs. After the signal passes through a resistor divider and a Zener diode, it is transmitted to the operational amplifier U8C through an RC filter; after corresponding amplification, it is input to the ADC sampling module of U11 for sampling through an RC low-pass filter. The sampled value is compared with a set threshold, and then corresponding processing is performed.

[0046] In the above embodiments, the dispensing selection automatic encoder circuit of the present invention identifies the encoder signal of the motor to determine the output status of the motor; it modulates the output status based on the comparison between the output data and the setting data. Through a specific algorithm, it achieves precise control of the screw dispensing valve, thereby realizing precise dispensing operations. The present invention has two independent and identical dispensing valve control circuits 103 and encoder circuits 104. In this embodiment, the encoder circuit 104 includes an encoder chip, and the encoder chip model is AM26L32ACDR, combined with... Figures 6 to 11 The image shown is a specific embodiment of the encoder circuit 104 in this example.

[0047] In addition, the multi-functional screw pump dispensing control system also includes a power supply circuit 106, which includes a 24V DC power supply, a 12V DC power supply, a 5V DC power supply, and a 3.3V DC power supply to power different modules, thereby achieving different functions. (Refer to...) Figures 11 to 13 As shown, this is a specific embodiment of the power supply circuit 106 in this example. The power supply circuit 106 includes power chips U2 and U3, which are model BL9342.

[0048] In the above embodiments, the multi-functional screw pump dispensing control system further includes a pressure sensor detection circuit 107, a communication circuit 108, a solenoid valve control circuit 109, a DIP switch circuit 110, and a display screen circuit 111 connected to the data processing chip U11.

[0049] like Figure 15 , 16 The diagram shows a specific embodiment of the pressure sensor detection circuit 107. This circuit includes an operational amplifier U15, specifically an LMV324, which detects the pressure of the dispensing valve. During operation, the screw dispensing valve may experience blockage. Even when the motor is rotating and there is no blockage, the pressure of the adhesive will increase, potentially leading to a pipe burst. Adding a pressure sensor at the feeding point allows for real-time monitoring. When the adhesive pressure exceeds a threshold, an alarm is triggered to stop the feeding and allow for operator intervention, thus preventing serious malfunctions during dispensing. This piezoelectric sensor uses a current-type sensor, identifying the pressure magnitude through current sampling. It is also designed to be compatible with voltage-type sensors for easy replacement and selection of peripherals.

[0050] like Figure 17The diagram illustrates a specific embodiment of the display circuit 111, which includes a transceiver chip U1, specifically a MAX3232. In this embodiment, a touch serial port display is used to trigger the controller's dispensing operation, set relevant dispensing parameters, and display parameters such as the number of dispensing cycles. Human-computer interaction is performed through the display. A 3.5-inch, 800*400 pixel, 65K color display is selected. Serial communication with good interference resistance is employed, minimizing the risk of interference causing display malfunction.

[0051] like Figure 18 The diagram shows a specific embodiment of the communication circuit 108, which includes an isolated transceiver module U4, model TD331S232H. In this embodiment, the dispensing automation platform uses RS232 to set relevant parameters of the controller or perform necessary information queries. It can also upgrade the controller's software via RS232 communication. Because the electrical system of the dispensing automation control platform is relatively complex, an electrically isolated RS232 communication module is used.

[0052] like Figure 19 The diagram illustrates a specific embodiment of the solenoid valve control circuit 109. This circuit includes an optocoupler U17, model PS2501-1. The atomization function is achieved through the solenoid valve control circuit 109. In this embodiment, the atomization function is implemented via a pressure switch, controlling an internally integrated pressure gauge to adjust the pressure according to the atomization medium, thus achieving the atomization function. The pressure gauge only adjusts the pressure and does not display the switch action. The pressure is switched by controlling the solenoid valve, thereby achieving the atomization function. This embodiment also features a clever application: typically, MOSFETs require a 12V power supply for control; however, this controller lacks a 12V power supply, and adding one would increase costs. This design cleverly reduces the 24V power supply through the optocoupler, allowing control of the 24V power supply to drive the MOSFET switch.

[0053] like Figure 20 The diagram shows a specific embodiment of the DIP switch circuit 110, which includes a DIP switch DIP-4. Because the controller of this invention employs multiple integrated design methods, it includes single-component screw dispensing and spraying functions, two independent single-component screw dispensing valves for control and spraying functions, and two-component screw dispensing valves for control and spraying functions. Different programs programmed for different controls are inconvenient for production and maintenance. The DIP switch is used for function selection, allowing different programs to be selected based on the desired function.

[0054] In addition, the multi-functional screw pump dispensing control system also includes an optocoupler-isolated input circuit 112 and an optocoupler-isolated output circuit 113. One end of both the optocoupler-isolated input circuit 112 and the optocoupler-isolated output circuit 113 is connected to the data processing chip U11, and the other end of both is connected to the same connector CN13. The optocoupler-isolated input circuit 112 includes an optocoupler U20, and the optocoupler-isolated output circuit 113 includes an optocoupler U19. Both optocouplers U19 and U20 are of model PS2805-4. (Refer to...) Figure 21 The diagram shows a specific embodiment of the optocoupler isolation input circuit 112; see reference. Figure 22 The diagram shows a specific embodiment of the optocoupler-isolated output circuit 113. This invention employs four-channel optocoupler-isolated inputs and four-channel optocoupler-isolated outputs. It receives hardware-triggered dispensing modes from the automated dispensing system. Of the four optocoupler-isolated inputs, one is used to trigger the dispensing operation of the controller on the automated dispensing control platform, while the other three are reserved for future function additions and upgrades. Hardware triggering meets the corresponding rapid dispensing requirements. This controller is used in high-speed dispensing systems and needs to respond quickly to dispensing demands; otherwise, a delayed dispensing position will affect the dispensing process. Of the four optocoupler-isolated outputs, one is used to generate an alarm signal to the automated platform when the controller triggers an alarm, and the platform simultaneously handles the alarm. The remaining three are reserved for future expansion, particularly for functions such as controlling solenoid valves.

[0055] Through the circuit structure described above, the multifunctional screw pump dispensing control system of the present invention employs complementary PWM to control the switching of MOSFETs via a driver IC, thereby achieving motor control. Simultaneously, it samples the current value to determine whether dispensing is in operation or if a stall condition has occurred. Furthermore, it identifies the motor's built-in encoder and controls the motor's precise movements through a specific algorithm. In addition, this controller is compatible with multiple operating types: single-component screw dispensing valve control, single-component screw dispensing valve with spray function, controller simultaneously controlling two independent screw dispensing valves with or without spray function; achieving two-component dispensing valve control, or implementing spray function on the basis of a two-component screw dispensing valve.

[0056] The pressure sensing system employs a compatible design with both current and voltage-based schemes, facilitating peripheral selection and replacement. Furthermore, detecting the feed pressure prevents production accidents caused by material blockage at the screw dispensing valve. All related voltage and current sampling utilizes the MCU's automatic ADC module, employing operational amplifier isolation to prevent damage to the MCU's ADC sampling pins in case of high-voltage anomalies. This differs from previous designs that directly connected to the MCU's ADC sampling pins after resistor voltage division, effectively protecting the MCU's ADC sampling pins from damage.

[0057] The controller and dispensing platform are interconnected via optocoupler isolation, allowing for both input and output signals. This prevents malfunctions in the controller from going unnoticed by the automated dispensing platform, which could lead to product defects. Additionally, a built-in buzzer and LED lights provide alarm and alert functions, facilitating troubleshooting by operators. The controller also features a built-in dot storage device for convenient parameter storage and operation.

[0058] The solenoid valve controller circuit cleverly utilizes optocouplers to control a MOSFET that requires a 12V power supply while operating on a 24V power supply, reducing design costs and complexity. Simultaneously, the solenoid valve features real-time current detection, allowing the system to determine whether the valve is operational. Furthermore, current detection enables short-circuit protection, preventing damage to the controller's internal control board.

[0059] A resistive touchscreen with serial communication was adopted instead of the previous button-based monochrome LCD solution. This improved the human-machine interface, making controller operation simpler and more user-friendly. It also reduced the reliance on the main control MCU, conserving valuable MCU ports. Serial communication is more stable, resolving the previous issue of frequent white screen and garbled characters caused by motherboard malfunctions.

[0060] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A multifunctional screw pump dispensing control system, characterized in that, This includes MCU data processing circuitry, ADC sampling circuitry, and dispensing valve control circuitry; The MCU data processing circuit includes a data processing chip U11, and the dispensing valve control circuit includes a driver IC connected to the data processing chip U11 and a MOSFET connected to the driver IC. The data processing chip U11 outputs complementary PWM to control the driver IC, which drives the MOSFET to switch the power supply and control the motor of the dispensing valve. The complementary PWM ensures that the MOSFETs on the same side will not be damaged when they are turned on at the same time. In addition, by changing the direction of the power supply, the forward and reverse rotation of the dispensing valve can be controlled, thereby realizing the dispensing and suction operations. The signal input terminal of the ADC sampling circuit is connected to the dispensing valve control circuit, and the signal output terminal is connected to the data processing chip U11. By sampling the current of the motor in real time, it can detect whether the dispensing current exceeds the normal value. The multi-functional screw pump dispensing control system also includes an encoder circuit. The encoder is connected between the motor of the dispensing valve and the data processing chip U11. By identifying the encoder signal of the motor, the output of the motor is determined, and the output data is compared with the set data to modulate the output of the motor. The multi-functional screw pump dispensing control system also includes a solenoid valve control circuit and a DIP switch circuit connected to the data processing chip U11; the solenoid valve control circuit includes an optocoupler U17, and the optocoupler model is PS2501-1; the DIP switch circuit includes a DIP switch DIP-4. The solenoid valve control circuit controls the switching of the solenoid valve to switch the air pressure, thereby achieving the atomization function; the solenoid valve control circuit reduces the 24V power supply through the optocoupler U17, thereby controlling the 24V power supply to drive the MOS transistor to switch; the DIP switch circuit is used for function selection, selecting different programs to implement different functions; the function selection includes single-component screw dispensing function and spray function, two independent single-component screw dispensing valve control and spray function, and two-component screw dispensing valve control and spray function; The data processing chip U11 is model STM32F071VBT6; the driver IC of the dispensing valve control circuit includes driver U6 and driver U7, and the dispensing valve control circuit also includes an H-bridge driver circuit located between driver U6 and driver U7. The H-bridge driver circuit includes multiple MOSFETs, and the motor of the dispensing valve is controlled through the H-bridge driver circuit. The multi-functional screw pump dispensing control system also includes an optocoupler isolated input circuit and an optocoupler isolated output circuit. One end of both the optocoupler isolated input circuit and the optocoupler isolated output circuit is connected to the data processing chip U11, and the other end of both the optocoupler isolated input circuit and the optocoupler isolated output circuit is connected to the same connector CN13. The optocoupler isolated input circuit includes an optocoupler U20, and the optocoupler isolated output circuit includes an optocoupler U19. Both optocoupler U19 and optocoupler U20 are of model PS2805-4.

2. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The encoder circuit includes an encoder chip, and the encoder chip model is AM26L32ACDR.

3. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The data processing chip U11 has a memory module inside, which includes a memory chip U12, and the memory chip U12 is model AT24C64. The memory module is used to store and back up the dispensing parameters.

4. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The multi-functional screw pump dispensing control system also includes a power supply circuit, which includes a 24V DC power supply, a 12V DC power supply, a 5V DC power supply, and a 3.3V DC power supply.

5. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The multi-functional screw pump dispensing control system also includes a pressure sensor detection circuit connected to the data processing chip U11. The pressure sensor detection circuit includes an operational amplifier U15, and the operational amplifier U15 is an LMV324. The pressure sensor detection circuit detects the pressure of the dispensing valve.

6. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The multi-functional screw pump dispensing control system also includes a communication circuit connected to the data processing chip U11. This communication circuit includes an isolation transceiver module U4, and the isolation transceiver module U4 is model TD331S232H.

7. The multifunctional screw pump dispensing control system according to claim 1, characterized in that, The multi-functional screw pump dispensing control system also includes a display circuit connected to the data processing chip U11. The display circuit includes a transceiver chip U1, and the transceiver chip U1 is a MAX3232.

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