CN219370231U

CN219370231U - Pneumatic valve dispensing control circuit

Info

Publication number: CN219370231U
Application number: CN202320257829.4U
Authority: CN
Inventors: 王贵
Original assignee: Shenzhen Axis Piezoelectric Technology Co ltd
Current assignee: Shenzhen Axis Piezoelectric Technology Co ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-07-18
Anticipated expiration: 2033-02-13

Abstract

The utility model provides a pneumatic valve dispensing control circuit, which relates to the technical field of automatic dispensing, and comprises a main control MCU, a dispensing control module and an air pressure control module, wherein the dispensing control module comprises a trigger unit and a protection unit, the main control MCU is connected with the trigger unit, receives a trigger signal and controls the dispensing according to the trigger signal; the main control MCU is connected with the protection unit and used for protecting the circuit when the dispensing is abnormal; the main control MCU is connected with the air pressure control module, and the air pressure control module is connected with the proportional valve and used for controlling the size of the dispensing air pressure.

Description

Pneumatic valve dispensing control circuit

Technical Field

The utility model relates to the technical field of automatic dispensing, in particular to a pneumatic valve dispensing control circuit.

Background

In an automatic dispensing system, a part of dispensing processes do not need precise dispensing operation, and the piezoelectric valve and the pneumatic valve can meet the dispensing requirement. Piezoelectric valves are difficult to produce, and in particular, nozzles and strikers in piezoelectric valves require high precision machining, which is difficult and expensive to manufacture, relative to pneumatic valves. The pneumatic valve only needs the needle barrel to be matched with the relevant adapter and the needle head, is extremely low in cost and easy to manufacture, and has extremely wide application in the non-precise dispensing industry.

At present, the dispensing industry has a plurality of pneumatic valve applications, but the stability of the glue amount is generally difficult to control; particularly, as the glue amount in the glue barrel is reduced, the output glue amount is unstable, the glue dispensing operation is influenced, and the stable glue amount output in the whole glue dispensing process cannot be realized.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a pneumatic valve dispensing control circuit.

The technical scheme adopted for solving the technical problems is as follows: in a pneumatic valve dispensing control circuit, the improvement comprising: the device comprises a main control MCU, a dispensing control module and an air pressure control module, wherein the dispensing control module comprises a trigger unit and a protection unit, the main control MCU is connected with the trigger unit, receives a trigger signal and controls the dispensing according to the trigger signal; the main control MCU is connected with the protection unit and used for protecting the circuit when the dispensing is abnormal; the main control MCU is connected with the air pressure control module, and the air pressure control module is connected with the proportional valve and used for controlling the size of the dispensing air pressure.

In the above circuit, the trigger unit includes a resistor R120 and an optocoupler U66, where one end of the resistor R120 receives an externally input trigger signal, and the other end is connected with the optocoupler U66, and the optocoupler U66 is connected with the master control MCU.

In the circuit, the protection unit comprises an optical coupler U6 and a field effect tube Q2, wherein the optical coupler U6 is connected with the main control MCU, the optical coupler U6 is connected with the grid electrode of the field effect tube Q2, and the source electrode of the field effect tube Q2 is grounded.

In the circuit, the air pressure control module comprises an air pressure control unit which comprises an operational amplifier,

the positive input port of a first operational amplification unit in the operational amplifier is connected with the main control MCU and receives DAC values;

the output port of the first operational amplification unit is connected with the positive input port of a second operational amplification unit in the operational amplifier, and the output port of the second operational amplification unit is connected with the proportional valve.

In the circuit, the air pressure control module further comprises a signal feedback unit which is respectively connected with the proportional valve and the main control MCU and used for outputting a feedback signal of the proportional valve to the main control MCU for sampling.

In the above circuit, the air pressure control module further comprises an air pressure detection unit, wherein the air pressure detection unit comprises an air pressure sensor, and the air pressure sensor is used for detecting air pressure and is connected with the main control MCU for judging the value of air pressure.

The circuit further comprises a voltage conversion module, wherein the voltage conversion module comprises a first voltage conversion unit and a second voltage conversion unit, and the first voltage conversion unit comprises a conversion chip U4 for converting 24V voltage into 5V voltage;

the second conversion unit includes a conversion chip U5 for converting the 5V voltage into a 3.3V voltage.

In the circuit, the device also comprises an RS232 communication module, a storage module and a buzzer module,

the RS232 communication module comprises an isolation RS232 chip U82, wherein the isolation RS232 chip U82 is connected with the MCU, and is used for communicating the MCU with external RS 232;

the storage module comprises a storage chip U81, and the storage chip U81 is connected with the main control chip MCU and used for storing parameters;

the buzzer module comprises a triode Q1 and a buzzer S1, wherein a base electrode of the triode Q1 is connected with the main control MCU, a collector electrode is connected with the buzzer S1, and an emitting electrode is grounded and used for controlling the starting of the buzzer.

In the circuit, the display module further comprises a display communication chip U90, wherein the display communication chip U90 is connected with the main control MCU and an external display for controlling the communication between the main control MCU and the display screen.

The beneficial effects of the utility model are as follows: by controlling the size of the dispensing air pressure, the dispensing air pressure is accurately controlled, the stability of the dispensing amount is ensured, and the stable dispensing amount output of the whole dispensing process is realized.

Drawings

Fig. 1 is a schematic block diagram of a pneumatic valve dispensing control circuit according to the present utility model.

Fig. 2 is a circuit schematic diagram of the trigger unit and the protection unit of the present utility model.

Fig. 3 is a schematic circuit diagram of one embodiment of a two-way solenoid valve control signal according to the present utility model.

Fig. 4 is a schematic circuit diagram of an air pressure control unit in an air valve dispensing control circuit according to the present utility model.

Fig. 5 is a circuit diagram of a signal feedback unit in the present utility model.

Fig. 6 is a circuit diagram of the air pressure detecting unit in the present utility model.

Fig. 7 is a circuit diagram of a voltage conversion module according to the present utility model.

Fig. 8 is a schematic circuit diagram of the RS232 communication module, the storage module and the buzzer module in the present utility model.

Fig. 9 is a circuit diagram of a display module according to the present utility model.

Fig. 10 is a schematic diagram of a pneumatic valve dispensing control circuit according to the present utility model.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1 and 2, the utility model provides a pneumatic valve dispensing control circuit, which comprises a main control MCU, a dispensing control module and an air pressure control module, wherein the dispensing control module comprises a trigger unit 10 and a protection unit 20, the main control MCU is connected with the trigger unit 10 and receives a trigger signal DI, and the main control MCU controls the dispensing according to the trigger signal DI; the main control MCU is connected with the protection unit 20 and is used for protecting a circuit when the dispensing is abnormal; the main control MCU is connected with the air pressure control module, the air pressure control module is connected with the proportional valve and used for controlling the size of the dispensing air pressure, realizing accurate control of the dispensing air pressure, ensuring the stability of the dispensing amount and realizing stable dispensing amount output of the whole dispensing process. The model of the master MCU may be GD32F303RET6.

Referring to fig. 2, the triggering unit 10 includes a resistor R120 and an optocoupler U66, the model of the optocoupler U66 is TLP181, one end of the resistor R120 receives an externally input triggering signal, the other end is connected with the optocoupler U66, and the optocoupler U66 is connected with the master MCU. When the external signal received by the resistor R120 is 0V, the optocoupler U66 is turned on. The capacitor C120 performs filtering function and the diode D5 performs voltage limiting protection. The signal IN-D is connected with the MCU port of the main control for detection. And triggering the dispensing operation through the DI signal, and starting the dispensing operation when the trigger signal is received.

Referring to fig. 2, the protection unit 20 includes an optocoupler U6 and a field effect transistor Q2, the model of the optocoupler U6 is TLP181, the optocoupler U6 is connected to the master MCU, the optocoupler U6 is connected to the gate of the field effect transistor Q2, and the source of the field effect transistor Q2 is grounded. The main control MCU controls the switching condition of the optocoupler U6 through an OUT1 signal, and the resistor R5 is connected to a 3.3V power supply to perform current limiting. The optocoupler U6 is connected to 24V, and the switching state of the field effect transistor Q2 is controlled through a resistor R47 and a resistor R7. The drain electrode of the field effect transistor Q2 is connected to a terminal, and is matched with a 24V power supply, so that an external small load such as a relay coil, a low-power LED and the like can be conveniently controlled. Or to an open-drain IO signal. The diode D4 limits the amplitude and protects the fet Q2. The DO signal is a hardware signal of the fed-back dispensing system, and when the dispensing control circuit is abnormal or the dispensing control circuit is restarted, the DO signal is output to the dispensing system, and the dispensing system stops dispensing operation to prevent products from being damaged by the abnormal dispensing. With reference to fig. 3, two solenoid valve control signals are used to control two solenoid valves to switch on or off the air source. Other DI and DO make reservation use.

Referring to fig. 4, the air pressure control module includes an air pressure control unit 30, the air pressure control unit 30 includes an operational amplifier, a positive input port of a first operational amplifier in the operational amplifier is connected with the main control MCU, and receives DAC values; the output port of the first operational amplification unit is connected with the positive input port of a second operational amplification unit in the operational amplifier, and the output port of the second operational amplification unit is connected with the proportional valve. The main control MCU outputs a signal of the DAC module through a signal DA-V-C1, is connected to a first operational amplification unit U83B of an operational amplifier U83 (model LM358B of the operational amplifier U83), and is connected to a second operational amplification unit U83A for amplification after a voltage following function. The resistor R56, the resistor R98, the resistor R97 and the resistor R90 form amplification factors, and the amplification signals DA-valve-cont 1 are output to the control port of the proportional valve for control, and the two proportional valves are controlled and adjusted by the two identical pneumatic control units 30. With reference to fig. 5, the air pressure control module further includes a signal feedback unit 40, where the signal feedback unit 40 is connected to the proportional valve and the main control MCU, respectively, and is configured to output a feedback signal of the proportional valve to the main control MCU for sampling. The signal AD-valve-feedback1 is a feedback signal of the proportional valve, and after the voltage is divided by the resistor R64 and the resistor R60, the feedback signal is connected to an ADC module of the main control MCU for sampling. As shown in fig. 6, the air pressure control module further includes an air pressure detecting unit 50, where the air pressure detecting unit 50 includes an air pressure sensor, and the air pressure sensor detects air pressure and is connected to the main control MCU, and is used for determining the value of air pressure. After the main control MCU calculates the air pressure, the opening and closing conditions of the proportional valve are adjusted, so that the required air pressure value is output. The switching of the electromagnetic valve is matched, and the air pressure value when the glue is detected and the negative air pressure value when the glue is sucked back are respectively detected; meets the application of stable glue. The air pressure sensor U1, the air pressure sensor U2 and the air pressure sensor U80 detect the pressure of air pressure, the model of the air pressure sensor U1 is GZP6899A, and the model of the air pressure sensor U2 and the model of the air pressure sensor U80 are GZP6877A. For example, the air pressure sensor U1 is used to output a voltage analog quantity, and the air pressure is connected to the air pressure sensor U1 through a special port. After the voltage analog quantity passes through the resistor R3 and the resistor R9, the voltage analog quantity is connected with an ADC detection module of the main control MCU to acquire voltage. Thereby judging the magnitude of the air pressure.

Two paths of proportional valves (the proportional valve in the utility model refers to an electromagnetic proportional valve) are controlled, and a main control MCU outputs DAC values; after the amplification is processed by the operational amplifier, the direct-current voltage of 0-10V is output. And adjusting the output of the DAC to control the proportional valve according to the air pressure required to be output. The electromagnetic switch is matched to realize accurate control of the air pressure. And detecting the feedback value of the proportional valve at the same time, and confirming the output condition of the proportional valve. The software adjusts the air pressure in real time according to different glue quantity conditions, so that stable glue quantity output is realized.

Referring to fig. 7, the voltage conversion module further comprises a voltage conversion module, wherein the voltage conversion module comprises a first voltage conversion unit and a second voltage conversion unit, the first voltage conversion unit comprises a conversion chip U4, and the model of the conversion chip U4 is TPS54331DDR, and the voltage conversion module is used for converting 24V voltage into 5V voltage; the second conversion unit comprises a conversion chip U5, and the model of the conversion chip U5 is LM1117-3.3, and the conversion chip is used for converting 5V voltage into 3.3V voltage. A24V power supply is introduced from the J2 terminal and connected to the U4 pin of the DC-DC unit through the thermistor F1 and the anti-reverse diode D1. Capacitor C14 and capacitor C17 perform energy storage and filtering functions. And outputting DC 5V voltage after conversion. The 5V power supply is converted into 3.3V voltage through a conversion chip U5 in the LDO unit. The controller is externally powered by using a 220V-to-24V adapter, and is internally powered by a thermistor and an anti-reflection diode. The first voltage converting unit (DC-DC unit) converts 24V into 5V, and the second voltage converting unit (LDO unit) converts 5V into 3.3V. The three voltages respectively supply power to different modules in the circuit.

Referring to fig. 8, the remote control system further comprises an RS232 communication module, a storage module and a buzzer module, wherein the RS232 communication module comprises an isolation RS232 chip U82, the model of the isolation RS232 chip U82 is TD302D232H, the isolation RS232 chip U82 is connected with a master control chip MCU and is used for the master control chip to communicate with external RS232, the isolation RS232 chip U82 is a two-way isolation RS232 module, and the isolation RS232 chip U82 is a RX/TX module of the master control MCU. TVS tube TVS3, TVS tube TVS4, resistor R93 and resistor R94 constitute the EMC circuit. And the P90 and the P91 are connected with external RS232 communication, so that the controller and the automatic dispensing system are provided for interconnection and intercommunication, and the system reads and sets dispensing parameters, modes and the like of the controller. The isolation module is used, so that the influence of the interference of the dispensing system on the working performance of the controller can be avoided;

the storage module comprises a storage chip U81, the model of the storage chip U81 is FM24CL64B, the storage chip U81 is connected with a main control chip MCU for parameter storage, the main control MCU is connected with the EEPROM storage chip U81 through FRAM_SCL for I2C communication, so that the storage function is controlled, the EEPROM storage chip U81 stores relevant parameters of a controller, the set parameters can be stored after the controller is powered down, and the controller has the advantages of unlimited data storage times, high read-write speed and the like;

the buzzer module comprises a triode Q1 and a buzzer S1, wherein a base electrode of the triode Q1 is connected with the main control MCU, a collector electrode is connected with the buzzer S1, and an emitting electrode is grounded and used for controlling the starting of the buzzer. The main control controls the switching condition of the triode Q1 through controlling the Alarm IO signal, thereby controlling the S1 switch of the buzzer to make a ringing. Diode D77 forms a loop to prevent electromagnetic interference from S1 from passing elsewhere. The buzzer is used as an alarm prompt, and alarms when the controller is abnormal, and the buzzer sounds, so that operators can check and process conveniently.

Referring to fig. 9, the display module further comprises a display communication chip U90, the model number of the display communication chip U90 is ST3232EBTR, and the display communication chip U90 is connected with the master control MCU and the external display for controlling the communication between the master control MCU and the display screen. The main control MCU is connected with the RS232 communication chip U90 through signals LCD-TX5 and LCD-RX 5. And J90 is a connection port of the serial port screen, and the display function of the display screen is controlled through RS 232. KEY1-KEY7 is 7 paths of IO detection signals of the main control MCU, J66 is connected to the KEYs, and when the level of the KEYs changes, the main control detects corresponding signal changes. The non-isolated RS232 communication module is used for realizing the communication between the main control board and the serial display screen; the friendly man-machine interaction condition is realized. Meanwhile, the serial port screen has the advantages of excellent interface display, easiness in development, stable working and the like. And 7 paths of switch circuits detect, so that different key inputs are respectively realized, and a human-computer interaction function is realized.

Referring to fig. 10, in the above embodiment, the controller externally uses a 220V to 24V adapter, and the internal power source uses a 24V to 5V DC-DC module, while the 5V to 3.3V power source; the DI and DO signals meet the hardware interconnection and intercommunication of the controller and the automatic dispensing system, and the two paths of electromagnetism switch the air pressure; the RS232 communication module, the controller and the system interact, the EEPROM stores important parameters, and the buzzer realizes the alarm prompting function; d. the two paths of proportional valves are used for controlling, so that the air pressure is controlled; e. the three-way air pressure sensor detects the air pressure, and feeds back whether the air pressure of the proportional valve is regulated correctly or not; f. and the serial display screen and the keys realize man-machine delivery and are convenient to operate and use. The glue dispensing quantity of the pneumatic valve is controlled in real time by controlling the air pressure, and the stable glue quantity is output. Compared with a piezoelectric valve, the cost is very low; can meet a large amount of non-precise dispensing application operations. The controller and the dispensing system are interconnected and communicated, so that automatic dispensing operation is conveniently realized.

According to the pneumatic valve dispensing control circuit, the dispensing air pressure is controlled, so that the dispensing air pressure is accurately controlled, the dispensing amount is ensured to be stable, and the stable dispensing amount output in the whole dispensing process is realized.

While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims

1. A pneumatic valve point gum control circuit which characterized in that: comprises a main control MCU, a dispensing control module and an air pressure control module, wherein the dispensing control module comprises a trigger unit and a protection unit,

the main control MCU is connected with the trigger unit, receives the trigger signal and controls the trigger dispensing according to the trigger signal;

the main control MCU is connected with the protection unit and used for protecting the circuit when the dispensing is abnormal;

the main control MCU is connected with the air pressure control module, and the air pressure control module is connected with the proportional valve and used for controlling the size of the dispensing air pressure.

2. The pneumatic valve dispensing control circuit of claim 1, wherein: the trigger unit comprises a resistor R120 and an optical coupler U66, wherein one end of the resistor R120 receives an externally input trigger signal, the other end of the resistor R120 is connected with the optical coupler U66, and the optical coupler U66 is connected with the main control MCU.

3. The pneumatic valve dispensing control circuit of claim 2, wherein: the protection unit comprises an optical coupler U6 and a field effect tube Q2, wherein the optical coupler U6 is connected with the main control MCU, the optical coupler U6 is connected with the grid electrode of the field effect tube Q2, and the source electrode of the field effect tube Q2 is grounded.

4. A pneumatic valve dispensing control circuit as recited in claim 3, wherein: the air pressure control module comprises an air pressure control unit which comprises an operational amplifier,

5. The pneumatic valve dispensing control circuit of claim 4, wherein: the air pressure control module also comprises a signal feedback unit which is respectively connected with the proportional valve and the main control MCU and is used for outputting the feedback signal of the proportional valve to the main control MCU for sampling.

6. The pneumatic valve dispensing control circuit of claim 4, wherein: the air pressure control module also comprises an air pressure detection unit, wherein the air pressure detection unit comprises an air pressure sensor, and the air pressure sensor is used for detecting air pressure and is connected with the main control MCU for judging the value of air pressure.

7. The pneumatic valve dispensing control circuit of claim 1, wherein: the voltage conversion module comprises a first voltage conversion unit and a second voltage conversion unit, wherein the first voltage conversion unit comprises a conversion chip U4 and is used for converting 24V voltage into 5V voltage;

8. The pneumatic valve dispensing control circuit of claim 1, wherein: also comprises an RS232 communication module, a storage module and a buzzer module,

9. The pneumatic valve dispensing control circuit of claim 1, wherein: the display module comprises a display communication chip U90, wherein the display communication chip U90 is connected with the main control MCU and an external display, and is used for controlling the communication between the main control MCU and a display screen.