Piezoelectric dispensing valve driving control system

Abstract

The utility model relates to the technical field of dispensing valve drive control, in particular to a piezoelectric dispensing valve drive control system which comprises a controller and a piezoelectric dispensing valve. The piezoelectric valve driving module, the power supply module, the power supply detection module, the interconnection detection module and the storage module are respectively connected with the main control module, the controller is connected with the piezoelectric dispensing valve through the interconnection detection module, and the main control module is used for realizing high-speed modulation signal output, motor control and overload protection; the piezoelectric valve driving module is used for driving and controlling the piezoelectric dispensing valve to dispense glue; the power supply module is used for converting commercial power and supplying power to the controller; the power supply detection module is used for detecting voltage and current of the piezoelectric valve driving module; the interconnection detection module is used for releasing a negative pressure power supply according to a detection signal to ensure a piezoelectric dispensing valve; and the storage module is used for storing and backing up important parameters of the controller.

Description

Technical Field

[0001] This utility model relates to the field of dispensing valve drive control technology, specifically to a piezoelectric dispensing valve drive control system. Background Technology

[0002] In the field of precision dispensing technology, piezoelectric dispensing valves are widely used in several key industries, including but not limited to mobile phone manufacturing, LED production, and battery manufacturing, due to their high precision and controllability. These industries generally rely on automated dispensing equipment to improve production efficiency and product quality. However, existing automated dispensing equipment faces some technical challenges in design and operation that urgently need to be addressed.

[0003] Firstly, automated dispensing equipment is typically bulky with a complex internal structure, particularly the piezoelectric dispensing valves and their actuators, which are often arranged in a compact yet dispersed manner. When maintaining or repairing the piezoelectric dispensing valves, technicians must first open a dedicated cabinet door and then manually shut down the valve actuator before proceeding with any subsequent insertion or removal operations. This cumbersome process not only increases maintenance time but can also significantly reduce work efficiency, causing considerable inconvenience to the continuous operation of the production line.

[0004] Secondly, the piezoelectric dispensing valve is driven by high pressure during operation, which poses a potential safety risk during replacement or maintenance. Specifically, if technicians perform live replacement of the piezoelectric dispensing valve without turning off the controller power, the internal electrical components are easily damaged by the current surge, leading to equipment failure and potentially endangering the safety of the operators. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this application provides a piezoelectric dispensing valve drive control system, which aims to realize hot-swappable piezoelectric dispensing valves while facilitating maintenance of the piezoelectric dispensing valve operation and ensuring that the piezoelectric dispensing valve and controller are not damaged.

[0006] The technical means adopted by this utility model to solve its technical problem is: a piezoelectric dispensing valve drive control system, including a controller and a piezoelectric dispensing valve, wherein the improvement is that the controller includes a main control module, and a piezoelectric valve drive module, a power supply module, a power supply detection module, an interconnection detection module, and a storage module respectively connected to the main control module; the controller and the piezoelectric dispensing valve are connected through the interconnection detection module.

[0007] The main control module adopts a 32-bit Cortex-M0 architecture high-performance embedded microcontroller to realize high-speed modulation signal output, motor control and overload protection;

[0008] The piezoelectric valve drive module is used to drive and control the piezoelectric dispensing valve to dispense adhesive.

[0009] The power module is used to convert mains power and supply power to the controller;

[0010] The power supply detection module is used to detect the voltage and current of the piezoelectric valve drive module;

[0011] The interconnection detection module is used to release negative pressure power according to the detection signal to ensure the piezoelectric dispensing valve;

[0012] The storage module is used to store and back up important parameters of the controller.

[0013] The piezoelectric valve drive module described in the above technical solution adopts a half-bridge Buck circuit. The main control module outputs complementary PWM to the half-bridge driver to drive the MOSFET switch. After passing through the LC circuit, a trapezoidal wave is formed to drive the piezoelectric injection valve.

[0014] The power module described in the above technical solution includes an AC220V to DC12V power supply, a DC12V to DC5V power supply, and a DC5V to DC3.3V power supply.

[0015] The power supply detection module described in the above technical solution includes a voltage detection module and a current detection module. When the voltage of the piezoelectric valve drive module exceeds the threshold for excessively high or low voltage, the voltage detection module outputs a signal to the main control module to provide an alarm. When the current of the piezoelectric valve drive module is abnormal, an alarm is triggered and the output of the piezoelectric valve drive module is shut down.

[0016] The interconnection detection module and the piezoelectric dispensing valve described in the above technical solution include single valve line connection and dual valve line connection. In the single valve line connection, the valve line contains a drive power signal, a valve internal temperature detection signal, and a valve internal information recording signal. In the dual valve line connection, the first valve line contains a valve internal temperature detection signal and a valve internal information recording signal, and the second valve line contains a temperature detection signal and a drive power signal.

[0017] The controller described in the above technical solution further includes a valve information recording module and a valve internal temperature detection module. The valve information recording module is used to record and store various parameters of the piezoelectric dispensing valve, including but not limited to the encoder line count, dispensing valve displacement, maximum dispensing speed, and minimum dispensing speed. The valve internal temperature detection module is used to monitor the internal temperature of the piezoelectric dispensing valve in real time to ensure that the piezoelectric ceramic and other key components are within a suitable temperature range during operation, and to trigger an alarm mechanism when the temperature exceeds a preset safety threshold.

[0018] The controller described in the above technical solution further includes an interconnection module, which comprises a communication unit, an optocoupler-isolated input unit, an optocoupler-isolated output unit, and a power conversion unit. The communication unit is used for communication between the controller and the automated dispensing platform, and for parameter setting and software upgrades of the controller through the automated dispensing platform. The optocoupler-isolated input unit is used to receive dispensing modes triggered by the automated dispensing system. The optocoupler-isolated output unit is used to send alarm signals to the automated platform. The power conversion unit converts 12V to 24V power, enabling electrical isolation between the controller and the machine.

[0019] The controller described in the above technical solution also includes a human-computer interaction module. The main control module of the controller is connected to the touch screen through the human-computer interaction module, and the controller realizes human-computer interconnection through the touch screen.

[0020] The beneficial effects of this utility model are: by integrating the controller and the piezoelectric dispensing valve through the above-mentioned piezoelectric dispensing valve drive control system, hot-swappable piezoelectric dispensing valve can be realized, which greatly facilitates the maintenance and repair of piezoelectric dispensing valve and minimizes the risk of damage to piezoelectric dispensing valve due to improper operation. Attached Figure Description

[0021] Figure 1 This is a structural block diagram of a piezoelectric dispensing valve drive control system according to an embodiment of the present invention;

[0022] Figure 2 This is a circuit diagram of the piezoelectric valve drive module shown in an embodiment of the present invention;

[0023] Figure 3 The circuit structure diagram of the power module shown in the embodiment of this utility model is as follows;

[0024] Figure 4 This is a circuit structure diagram of the power supply detection module shown in an embodiment of the present invention;

[0025] Figure 5 This is a circuit diagram of the storage module shown in an embodiment of the present invention;

[0026] Figure 6 The circuit structure diagram of the valve information recording module and the valve internal temperature detection module shown in the embodiment of this utility model is as follows;

[0027] Figure 7 This is a circuit structure diagram of the interconnection module shown in an embodiment of the present invention;

[0028] Figure 8 This is a circuit structure diagram of the human-computer interaction module shown in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. 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 utility model can be combined interactively without contradicting each other.

[0031] like Figure 1 As shown, this application provides a piezoelectric dispensing valve drive control system, including a controller 1 and a piezoelectric dispensing valve 2. The controller 1 includes a main control module 10, and a piezoelectric valve drive module 20, a power supply module 30, a power supply detection module 40, an interconnection detection module 50, and a storage module 60, all connected to the main control module 10. The controller 1 and the piezoelectric dispensing valve 2 are connected through the interconnection detection module 50.

[0032] The main control module 10 adopts a 32-bit Cortex-M0 architecture high-performance embedded microcontroller with abundant on-chip resources. It integrates multiple high-speed ADC functional units, advanced DMA timers, PWM output units, UART, SPI interfaces, and other modules, enabling human-machine interaction, 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. The piezoelectric valve drive module drives and controls the piezoelectric dispensing valve for dispensing. The power supply module converts mains power and supplies power to the controller. The power supply detection module detects the voltage and current of the piezoelectric valve drive module. The interconnection detection module discharges negative pressure power based on the detection signal to ensure the piezoelectric dispensing valve's stability. The storage module stores and backs up important parameters of the controller.

[0033] In one possible implementation, such as Figure 2 As shown, the piezoelectric valve drive module 20 adopts a half-bridge BUCK circuit. The main control module 10 outputs complementary PWM to the half-bridge driver U66, thereby driving the two MOSFETs Q92 and Q93 to switch. After passing through the LC circuit, a trapezoidal wave PZT+ is formed to drive the piezoelectric dispensing valve.

[0034] The +150V output from the power module 30 is regulated to provide a regulated power supply PZT-. The positive terminal of the piezoelectric ceramic of the piezoelectric dispensing valve provides an adjustable trapezoidal wave, and the negative terminal provides a stable DC power supply, thereby increasing the output force of the piezoelectric ceramic. With the addition of negative voltage, under the same parameters without negative voltage, the piezoelectric ceramic output displacement is greater and the amount of dispensing glue is more, ensuring a better dispensing effect.

[0035] Among them, I_BR I_P and I_PZT_P are current sampling signals, which are amplified by operational amplifiers and then collected in real time using an ADC. When the alarm threshold is reached, relevant protection processing is performed. At the same time, the voltage values ​​of PTZ+ and PTZ- are sampled and monitored in real time to ensure that the output is within the theoretical value range. If an abnormal value occurs, an alarm is triggered.

[0036] The U8 module provides a 100kHz drive frequency to supply charging energy for the high-side bridge, ensuring more reliable operation. MOSFET Q1 is normally inactive; it conducts to discharge the voltage energy of PZT- when the valve line is detected to be open. Otherwise, a brief surge of current occurs when the valve is repositioned.

[0037] Through the above embodiments, the piezoelectric valve drive signal adopts half-bridge drive, which is more economical than the high-voltage operational amplifier scheme and the drive method is simple and reliable; and the negative pressure is added during hot plugging and unplugging to increase the discharge circuit, further protecting the piezoelectric dispensing valve.

[0038] In one possible implementation, the power module 30 includes an AC220V to DC12V power supply, a DC12V to DC5V power supply, and a DC5V to DC3.3V power supply.

[0039] Specifically, such as Figure 3 As shown, module U1 is an AC220V to DC12V power supply unit, which is directly powered by AC mains. Terminal J2 connects the internal DC power supply of controller 1 to the main board to provide energy for piezoelectric valve drive module 10. Module U2 is a DC12V to DC5V DC power conversion module. Module U3 is a DC5V to DC3.3V power supply module.

[0040] In one possible implementation, such as Figure 4 As shown, the power supply detection module 40 includes a voltage detection module and a current detection module. When the voltage of the piezoelectric valve drive module exceeds the threshold for excessively high or low voltage, the voltage detection module outputs a signal to the main control module to provide an alarm. When the current of the piezoelectric valve drive module is abnormal, an alarm is triggered and the output of the piezoelectric valve drive module is shut down.

[0041] Specifically, module U21A detects the negative voltage of the piezoelectric valve drive module 10 in real time, and the controller issues an alarm when the voltage exceeds the threshold for excessive or insufficient voltage; module U21B detects the amplitude of the power supply +P150V in real time, and the controller issues an alarm when the voltage exceeds the threshold; at the same time, module U12B detects the positive voltage of the piezoelectric drive module to achieve excessive and insufficient voltage alarms.

[0042] The U12A module detects the current of the MOSFET in the piezoelectric valve drive module. When the current is abnormal, it alarms and shuts down the output of the piezoelectric valve drive module. The U22A module detects the large current of the piezoelectric dispensing valve. It mainly alarms and shuts down the ceramic output when the ceramic is damaged or has an abnormal short circuit. The U22B module detects the small current of the ceramic. It mainly detects the ceramic current when the controller 1 is powered on and the current value when the piezoelectric valve is adjusted by ADJ.

[0043] Through the above embodiments, the voltage and current sampling of the piezoelectric dispensing valve both use the MCU's automatic ADC module and employ operational amplifier isolation to prevent damage to the MCU's ADC sampling pins when high voltage abnormalities occur in the sampling signal. Compared to the previous design where the sampling was directly connected to the MCU's ADC sampling pin after voltage division by resistors, this effectively protects the MCU's ADC sampling pins from damage.

[0044] In one possible implementation, the interconnection detection module 50 and the piezoelectric dispensing valve 2 include a single valve line connection and a dual valve line connection, wherein...

[0045] In the single-valve-line connection method, the valve line internally contains a drive power signal, a valve internal temperature detection signal, and a valve internal information recording signal. When the valve line is connected or disconnected, the controller 1 cannot detect the temperature signal and the information recording signal, shuts off the piezoelectric dispensing valve drive power signal, and the controller 1 alarms to indicate that the valve line is not connected. At the same time, the negative pressure relief circuit is activated to release the negative pressure power, ensuring that there is no high pressure when the piezoelectric dispensing valve is reinserted. This prevents the piezoelectric dispensing valve from being damaged by the large current and high-voltage arc generated at the moment of connection. When the piezoelectric dispensing valve is reconnected, the controller detects the temperature signal and the information recording signal, re-outputs the piezoelectric dispensing valve drive power signal, shuts off the valve line not connected alarm, disconnects the negative pressure relief circuit, ensures normal negative pressure output, and the power signal increases slowly to ensure sufficient charging time.

[0046] In the dual-valve connection method, the first valve line includes an internal temperature detection signal and an internal information recording signal, while the second valve line includes a temperature detection signal and a drive power signal. When the first valve line is connected or disconnected, the controller 1 does not detect the two signals within the first valve line, triggers an alarm indicating a disconnected valve line, and shuts off the piezoelectric drive power signal. Simultaneously, the negative pressure relief circuit is activated to release negative pressure. When the first valve line is disconnected and then connected again, both signals are detected, the disconnected valve line alarm is deactivated, and the piezoelectric dispensing valve drive power signal is output. The negative pressure relief circuit is then disconnected to ensure normal negative pressure output. When the second valve line is connected or disconnected, the controller 1 does not detect the valve line temperature signal, deactivates the piezoelectric dispensing valve drive power signal, and triggers an alarm indicating a disconnected valve line. Simultaneously, the negative pressure relief circuit is activated to release negative pressure. When the second valve line is disconnected and then connected again, the controller 1 outputs the piezoelectric dispensing valve drive power signal, deactivates the disconnected valve line alarm, and the negative pressure relief circuit is then disconnected to ensure normal negative pressure output.

[0047] In one possible implementation, such as Figure 5 As shown, the storage module 60 is a U19 module of model FM24CL64B, which controls the internal EEPROM memory to store important parameters of the controller. It mainly stores and backs up important parameters such as dispensing parameters and the number of dispensing cycles, ensuring that the controller can retain important parameters, especially dispensing parameters, even after power failure, making it convenient for customers to use; eliminating the need to reset parameters every time the controller is powered on.

[0048] Through the above embodiments, the hot-swappable function of the piezoelectric dispensing valve is realized, which greatly facilitates the maintenance and repair of the piezoelectric dispensing valve and minimizes the risk of damage to the piezoelectric dispensing valve due to improper operation. Especially in the production site, where the controller and the piezoelectric dispensing valve are placed separately, operators may easily forget to turn off the controller power before disassembling or assembling the piezoelectric dispensing valve, thereby causing irreversible damage to the piezoelectric dispensing valve. This application effectively avoids the above problems.

[0049] For one possible implementation, please refer to [link / reference]. Figure 1 As shown, the piezoelectric dispensing valve drive control system also includes a valve information recording module 70 and a valve internal temperature detection module 80, wherein,

[0050] The valve information recording module is used to record and store various parameters of the piezoelectric dispensing valve, including but not limited to the number of encoder lines, dispensing valve displacement, maximum dispensing speed, and minimum dispensing speed. The controller 1 can identify the type of piezoelectric dispensing valve, record the number of dispensing points, and determine the connection status between the controller and the valve via a single bus.

[0051] Specifically, such as Figure 6As shown, module U17 is an analog switch controller. Pin X is output to X0-X3 via the controller in a time-division multiplexing manner. Diodes D5, D9, D10, and D11 prevent abnormal high voltage from passing through X0-X3, thus avoiding damage to module U17. Y0-Y3 are input to pin Y via the control input. Resistors R119, R121, R127, R142, TVS7, TVS11, TVS12, and TVS13 together prevent abnormal high voltage from passing through Y0-Y3 and damaging module U17. U10A and U10B provide a regulated current source. U20A and U20B filter and amplify the signal, providing it to the ADC module U9 for sampling. The signal is then provided to the main controller for processing via I2C.

[0052] The valve internal temperature detection module U9 is used to monitor the internal temperature of the piezoelectric dispensing valve in real time, ensuring that the piezoelectric ceramic and other key components are within a suitable temperature range during operation, and triggering an alarm mechanism when the temperature exceeds a preset safety threshold.

[0053] Pins 3 and 4 of module U9 are connected to a 3.3V power supply via resistors R59 and R60, respectively. Pin 5 of module U9 is connected to a ferrite bead FB5 and a capacitor C6, with the other end of capacitor C6 connected to capacitor C5. The other ends of capacitor C5 and ferrite bead FB5 are connected to a 3.3V power supply, respectively. Pin 6 of module U9 is connected to a 3.0V reference voltage via resistor R159 and grounded via resistor R160.

[0054] For one possible implementation, please refer to [link / reference]. Figure 1 As shown, the controller also includes an interconnect module 90, which includes a communication unit, an optocoupler isolated input unit, an optocoupler isolated output unit, and a power conversion unit.

[0055] like Figure 7 As shown, the communication unit U23 is used for the controller to communicate with the dispensing automation platform, and at the same time, the dispensing automation platform can set parameters and upgrade software for the controller.

[0056] The optocoupler-isolated input unit U4 is a 4-channel optocoupler-isolated input used to receive dispensing modes triggered by the automated dispensing system. One channel is used to trigger the dispensing operation of the controller on the automated dispensing control platform, while the other three channels are reserved for future function additions and upgrades. Hardware triggering can meet the corresponding fast dispensing requirements. This controller is used in high-speed dispensing systems, which need to respond quickly to dispensing requests; otherwise, a delay in dispensing position will affect the dispensing process.

[0057] The optocoupler isolated output unit U5 is a 4-channel optocoupler isolated output. One channel is used to generate an alarm signal to the automation platform when the controller generates an alarm, and the platform simultaneously processes the alarm. The other 3 channels are reserved for future expansion.

[0058] The power conversion unit U6 is used to convert 12V to 24V power, so that the controller and the machine are electrically isolated.

[0059] Through the above embodiments, the controller and the dispensing platform are interconnected by means of optical coupling isolation and input and output signals; this avoids situations where the controller fails to work due to abnormality, but the automated dispensing platform continues to work, causing product abnormalities.

[0060] For one possible implementation, please refer to [link / reference]. Figure 1 As shown, the controller also includes a human-computer interaction module.

[0061] Specifically, such as Figure 8 As shown, the main control module of the controller is connected to the touch screen through the human-machine interaction module U7, and the controller realizes human-machine interconnection through the touch screen; at the same time, the buzzer module U11 is used to sound an alarm when the controller has an alarm.

[0062] Through the above embodiments, the human-computer interaction adopts a touch screen solution, which is simple and user-friendly to operate; at the same time, the buzzer sounds to indicate when the controller alarms.

[0063] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A piezoelectric dispensing valve drive control system, comprising a controller and a piezoelectric dispensing valve, characterized in that, The controller includes a main control module, and a piezoelectric valve drive module, a power supply module, a power supply detection module, an interconnection detection module, and a storage module, all connected to the main control module. The controller is connected to the piezoelectric dispensing valve via the interconnection detection module. The main control module adopts a 32-bit Cortex-M0 architecture high-performance embedded microcontroller to realize high-speed modulation signal output, motor control and overload protection; The piezoelectric valve drive module is used to drive and control the piezoelectric dispensing valve to dispense adhesive. The power module is used to convert mains power and supply power to the controller; The power supply detection module is used to detect the voltage and current of the piezoelectric valve drive module; The interconnection detection module is used to release negative pressure power according to the detection signal to ensure the piezoelectric dispensing valve; The storage module is used to store and back up important parameters of the controller.

2. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The piezoelectric valve drive module adopts a half-bridge Buck circuit. The main control module outputs complementary PWM to the half-bridge driver to drive the MOSFET switch. After passing through the LC circuit, a trapezoidal wave is formed to drive the piezoelectric injection valve.

3. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The power module includes an AC220V to DC12V power supply, a DC12V to DC5V power supply, and a DC5V to DC3.3V power supply.

4. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The power supply detection module includes a voltage detection module and a current detection module, wherein, When the voltage of the piezoelectric valve drive module exceeds the threshold for excessively high or low voltage, the voltage detection module outputs a signal to the main control module to provide an alarm. An alarm is triggered and the output of the piezoelectric valve drive module is shut down when the current of the piezoelectric valve drive module becomes abnormal.

5. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The interconnection detection module and the piezoelectric dispensing valve include single-valve-line connection and dual-valve-line connection, wherein... In the single valve line connection method, the valve line contains a drive power signal, a valve internal temperature detection signal, and a valve internal information recording signal. In the dual-valve line connection method, the first valve line includes a valve internal temperature detection signal and a valve internal information recording signal, while the second valve line includes a temperature detection signal and a drive power signal.

6. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The controller also includes a valve information recording module and a valve internal temperature detection module, wherein... The valve information recording module is used to record and store various parameters of the piezoelectric dispensing valve, including but not limited to encoder line count, dispensing valve displacement, maximum dispensing speed, and minimum dispensing speed. The valve internal temperature detection module is used to monitor the internal temperature of the piezoelectric dispensing valve in real time, ensuring that the piezoelectric ceramic and other key components are within a suitable temperature range during operation, and triggering an alarm mechanism when the temperature exceeds a preset safety threshold.

7. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The controller further includes an interconnect module, which comprises a communication unit, an optocoupler-isolated input unit, an optocoupler-isolated output unit, a power conversion unit, and... The communication unit is used for communication between the controller and the dispensing automation platform, and at the same time, the dispensing automation platform is used to set parameters and upgrade software for the controller. The optocoupler-isolated input unit is used to receive the dispensing mode triggered by the automated dispensing system; The optocoupler-isolated output unit is used to send alarm signals to the automation platform; The power conversion unit is used to convert 12V to 24V power, so that the controller and the machine are electrically isolated.

8. The piezoelectric dispensing valve drive control system according to claim 1, characterized in that, The controller also includes a human-computer interaction module. The main control module of the controller is connected to the touch screen through the human-computer interaction module, and the controller realizes human-computer interconnection through the touch screen.

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