CN112099391A

CN112099391A - Automatic control system for ventilation cabinet door

Info

Publication number: CN112099391A
Application number: CN202010774993.3A
Authority: CN
Inventors: 徐连法
Original assignee: Weifang Zhengtong Electronic Technology Co ltd
Current assignee: Weifang Zhengtong Electronic Technology Co ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-12-18

Abstract

The invention discloses an automatic control system for a ventilation cabinet door, which comprises a motor and is characterized in that: the control end of the motor is electrically connected with a CPU module for controlling the motor to perform positive rotation, negative rotation and rotation speed, the input end of the CPU module is electrically connected with an encoder for automatically detecting the rotation direction and speed of the motor and the rotation angle and the number of turns of the motor, the encoder is electrically connected with the input end of the CPU module through an encoder control circuit and is used for detecting the rotation angle and the number of turns of the motor, so that the CPU module calculates the specific position of the ventilation cabinet door according to the rotation angle and the number of turns of the motor detected by the encoder, the encoder is used for detecting the rotation direction of the motor so that the CPU module judges that the ventilation cabinet door is driven by, the invention can detect the obstacle at the ventilation cabinet door in real time, completely realize the automatic control of the cabinet door of the ventilation cabinet and improve the safety in use.

Description

Automatic control system for ventilation cabinet door

Technical Field

The invention relates to a control system of a fume hood, in particular to an automatic control system of a fume hood door, which has high automation degree, is convenient to use and is safe, and belongs to the technical field of fume hoods.

Background

The fume chamber is in the chemistry experiment room, experiment operating personnel, the used laboratory cabinet of during operation, and chemistry experiment operating personnel, the during operation can contact chemical experiment article inevitable, and some chemical exist poisonous and volatile composition, can seriously harm experiment operator's healthy, so the fume chamber has just appeared.

The concrete structure of the existing fume hood is as follows: 201410162934.5 provides an electric ventilation control cabinet comprising: a cabinet, comprising: the window frame and the window can move on the window frame; the height of the window is less than that of the window frame; the driving device is used for driving the window to move on the window frame, is arranged at the top of the cabinet body and is in driving connection with the window; the controller is arranged on the cabinet body and is connected with the driving device; the controller includes: and the window electric control unit is used for controlling the driving device to work so as to drive the window to move on the window frame and is connected with the driving device.

Above-mentioned this type of electric ventilation switch board, but the automatic rising of electric control window, and is easy for operation, but its overall security is low, can not be to window real time monitoring and control, it only passes through a height sensor to the detection of window height, detect the upper limit position of window, and then when operating personnel goes on the lift of control window in the fume chamber front side, if there is the barrier below of window, it is dangerous to take place to press from both sides the barrier damage easily, and do not possess and prevent pressing from both sides the function, its degree of automation is low, the easy dangerous operation that takes place.

Disclosure of Invention

The invention aims to provide an automatic control system for a ventilation cabinet door, which has high automation degree, is convenient to use and is safe.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides a ventilation cabinet door automated control system, includes the motor, its characterized in that: the control end electric connection of motor carries out just, the CPU module of reversal and slew velocity, the input electric connection of CPU module has the encoder that is used for automatic detection motor to turn to and speed and turned angle and number of turns, the encoder passes through the input electric connection of encoder control circuit with the CPU module, the encoder is used for detecting the turned angle and the number of turns of motor, make the specific position of ventilation cabinet door is calculated to the turned angle and the number of turns of the motor that the CPU module detected to obtain according to the encoder, the encoder is used for turning to make the CPU module according to should turning to of detection motor, when judging motor drive ventilation cabinet door and going up and down, whether have the blockking of barrier, the input electric connection of CPU module has the detection sensor group.

The following is a further optimization of the above technical solution of the present invention:

the CPU module adopts the following types: STM32F103VCT 6.

Further optimization: the encoder control circuit comprises an encoder A phase signal detection circuit, an encoder B phase signal detection circuit and an encoder zeroing circuit.

Further optimization: the encoder A phase signal detection circuit comprises a first high-speed photoelectric coupler, a first resistor, a third resistor, a fifth resistor and a light emitting diode, wherein the model of the first high-speed photoelectric coupler is 6N 137S;

a pin 2 of the first high-speed photoelectric coupler is connected with a 24V power supply through a third resistor, a pin 3 of the first high-speed photoelectric coupler is connected with a BMQA end of the encoder, one end of the first resistor is connected with the 24V power supply, and the other end of the first resistor is connected with a pin 3 of the first high-speed photoelectric coupler through a light emitting diode;

the 5 feet of the first high-speed photoelectric coupler are grounded, the 6 feet of the first high-speed photoelectric coupler are connected with the 92 feet of the CPU module, the 7 feet and the 8 feet of the first high-speed photoelectric coupler are respectively connected with a VCC3.3 power supply, one end of the fifth resistor is connected with the VCC3.3 power supply, and the other end of the fifth resistor is connected with the 6 feet of the first high-speed photoelectric coupler.

Further optimization: the encoder B phase signal detection circuit comprises a second high-speed photoelectric coupler, a second resistor, a fourth resistor, a sixth resistor and a light emitting diode, wherein the model of the second high-speed photoelectric coupler is 6N 137S;

a pin 2 of the second high-speed photoelectric coupler is connected with a 24V power supply through a fourth resistor, a pin 3 of the second high-speed photoelectric coupler is connected with a BMQB end of the encoder, one end of the second resistor is connected with the 24V power supply, and the other end of the second resistor is connected with a pin 3 of the second high-speed photoelectric coupler through a light emitting diode;

the 5 feet of the second high-speed photoelectric coupler are grounded, the 6 feet of the second high-speed photoelectric coupler are connected with the 93 feet of the CPU module, the 7 feet and the 8 feet of the second high-speed photoelectric coupler are respectively connected with a VCC3.3 power supply, one end of a sixth resistor is connected with the VCC3.3 power supply, and the other end of the sixth resistor is connected with the 6 feet of the second high-speed photoelectric coupler.

Further optimization: the encoder return-to-zero circuit comprises a fifth photoelectric coupler, a sixteenth resistor, a twenty-first capacitor and a twenty-first resistor;

a pin 1 of the fifth photoelectric coupler is connected with a 24V power supply through a sixteenth resistor, and a pin 2 of the fifth photoelectric coupler is connected with a BMQ GL end of the encoder; a pin 3 of the fifth photoelectric coupler is grounded, and a pin 4 of the fifth photoelectric coupler is connected with a pin 32 of the CPU module;

one end of the twenty-first capacitor and one end of the twenty-first resistor are connected with the 4 pin of the fifth photoelectric coupler, the other end of the twenty-first capacitor is grounded, and the other end of the twenty-first resistor is connected with a VCC3.3 power supply.

Further optimization: the output end of the CPU module is electrically connected with a motor control unit for controlling the motor to work, the motor control unit comprises a motor speed regulation module and a forward and reverse rotation control module, and the input end of the CPU module is electrically connected with a motor speed regulation input module for regulating and controlling the rotating speed of the motor.

Further optimization: the signal input end of the CPU module is electrically connected with a manual control unit, the manual control unit comprises an uplink button, a descending button and a stop button, the uplink button is electrically connected with the signal input end of the CPU module through an uplink control circuit, the descending button is electrically connected with the signal input end of the CPU module through a descending control circuit, and the stop button is electrically connected with the signal input end of the CPU module through a stop control circuit.

Further optimization: the output end of the CPU module is electrically connected with a buzzer, the buzzer is electrically connected with the CPU module through a buzzer alarm circuit, and when the CPU module controls the ventilation cabinet door to ascend or descend to an extreme position, the CPU module sends a signal to control the buzzer to alarm.

Further optimization: the detection sensor group comprises a human body sensor and an obstacle sensor, the obstacle sensor is electrically connected with the input end of the CPU module through an obstacle sensor circuit, and the human body sensor is electrically connected with the input end of the CPU module through a human body sensor circuit.

By adopting the technical scheme, the anti-pinch device is ingenious in conception and reasonable in structure, the encoder can be used for detecting the rotation angle and the number of turns of the motor, the CPU module can calculate the specific position of the ventilation cabinet door according to the rotation angle and the number of turns of the motor detected by the encoder, the specific position of the ventilation cabinet door can be monitored in real time, the anti-pinch device is convenient to use, and the encoder is used for detecting the steering of the motor, so that the CPU module can judge whether an obstacle blocks when the ventilation cabinet door is driven to lift or not according to the steering, and an anti-pinch function is realized.

And can real-time supervision fume chamber whether have the user to realize through barrier sensor and human inductor, convenient to use can realize the cabinet door of automated control fume chamber completely.

And can carry out multiple filtering to input power through the power part, prevent to the influence of CPU module supply circuit when the motor starts, stops, prevent that the CPU module is burnt out to the heavy current, convenient to use can improve the accuracy of detection data, facilitates the use.

The invention is further illustrated with reference to the following figures and examples.

Drawings

FIG. 1 is a schematic diagram of an overall control system according to an embodiment of the present invention;

FIG. 2 is a diagram of a signal detection circuit of an encoder A according to an embodiment of the present invention;

FIG. 3 is a diagram of a circuit for detecting the signal of the B-phase encoder according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a zeroing circuit of an encoder according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a forward rotation control circuit of a motor according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a motor reversal control circuit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a motor speed regulation input module in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a motor speed regulation module in an embodiment of the present invention;

FIG. 9 is a schematic diagram of an electromagnetic clutch control module in an embodiment of the present invention;

FIG. 10 is a diagram of an uplink control circuit according to an embodiment of the present invention;

FIG. 11 is a diagram of a downlink control circuit according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating a stop control circuit according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a buzzer warning circuit in an embodiment of the present invention;

FIG. 14 is a schematic diagram of an obstacle sensor circuit in an embodiment of the invention;

FIG. 15 is a schematic diagram of a human body sensor circuit according to an embodiment of the invention;

FIG. 16 is a schematic diagram of a fume hood operation prompt circuit in accordance with an embodiment of the present invention;

FIG. 17 is a diagram illustrating a data saving module according to an embodiment of the present invention;

FIG. 18 is a schematic diagram of an external power supply according to an embodiment of the invention;

FIG. 19 is a schematic diagram of a power supply portion in an embodiment of the invention;

FIG. 20 is a schematic diagram of a power supply portion in an embodiment of the invention;

FIG. 21 is a diagram of a CPU module according to an embodiment of the present invention.

Detailed Description

Example (b): as shown in fig. 1, an automatic control system for a ventilation cabinet door comprises a motor, wherein a control end of the motor is electrically connected with a CPU module U15 for controlling the motor to perform forward rotation, reverse rotation and rotation speed, an input end of the CPU module U15 is electrically connected with an encoder for automatically detecting the motor rotation direction, speed, rotation angle and number of turns, a detection end of the encoder is in transmission connection with a power output shaft of the motor, and an input end of the CPU module U15 is electrically connected with a detection sensor group.

Design like this, when using, the fixed top that sets up at the fume chamber of this motor, and the power take off end of motor passes through drive assembly and is connected with the transmission of ventilation cabinet door, motor work accessible drive ventilation cabinet door rises or the descending motion, and this motor rises or the descending motion is prior art through drive assembly drive ventilation cabinet door.

The encoder is arranged on one side of the motor, the detection end of the encoder is in transmission connection with a power output shaft of the motor, and the encoder is used for detecting the steering direction, the speed, the rotating angle and the number of turns of the motor.

Design like this, be used for detecting the turned angle and the number of turns of motor through the encoder to send to CPU module U15 in real time, CPU module U15 can detect the turned angle and the number of turns of the motor that obtains according to this encoder and can calculate the concrete position of fume chamber door, and then realize real-time supervision, the concrete position of the fume chamber door of fume chamber, convenient to use.

And the encoder is used for detecting turning to of motor makes CPU module U15 can be according to should turning to, when judging that motor drive ventilation cabinet door goes up and down, has blockking of barrier, realizes preventing pressing from both sides the function.

When motor drive ventilation cabinet door descends, its encoder work is used for detecting turning to of motor, there is the barrier in the below of ventilation cabinet door and blocks when the ventilation cabinet door descends, the encoder detects the motor turn signal that obtains and takes place the transition suddenly this moment, and then CPU module U15 can judge that the below of ventilation cabinet door has the barrier to block the ventilation cabinet door and descend, CPU module U15 signaling control motor reversal drive ventilation cabinet door rises this moment, prevent to press from both sides bad barrier or bump bad ventilation cabinet door, realize preventing pressing from both sides the function.

The encoder and the CPU module U15 are electrically connected with the input end of the CPU module U15 through an encoder control circuit.

As shown in fig. 1 to 4 and fig. 21, the encoder control circuit includes an encoder a phase signal detection circuit and an encoder B phase signal detection circuit and an encoder return-to-zero circuit.

The encoder A phase signal detection circuit comprises a first high-speed photoelectric coupler U1, a first resistor R1, a third resistor R3, a fifth resistor R5 and a light emitting diode L1, wherein the model of the first high-speed photoelectric coupler U1 is 6N 137S.

The 2 feet of the first high-speed photocoupler U1 are connected with a 24V power supply through a third resistor R3, the 3 feet of the first high-speed photocoupler U1 are connected with a BMQA end of the encoder, one end of a first resistor R1 is connected with the 24V power supply, and the other end of the first resistor R1 is connected with the 3 feet of the first high-speed photocoupler U1 through a light emitting diode L1.

The 5 feet of the first high-speed photoelectric coupler U1 are grounded, the 6 feet of the first high-speed photoelectric coupler U1 are connected with the 92 feet of the CPU module U15, the 7 feet and the 8 feet of the first high-speed photoelectric coupler U1 are respectively connected with a VCC3.3 power supply, one end of a fifth resistor R5 is connected with the VCC3.3 power supply, and the other end of the fifth resistor R5 is connected with the 6 feet of the first high-speed photoelectric coupler U1.

As shown in fig. 3 and 21, the encoder B-phase signal detection circuit includes a second high-speed photocoupler U2, a second resistor R2, a fourth resistor R4, a sixth resistor R6, and a light emitting diode L2, wherein the second high-speed photocoupler U2 is 6N 137S.

The 2 feet of the second high-speed photoelectric coupler U2 are connected with a 24V power supply through a fourth resistor R4, the 3 feet of the second high-speed photoelectric coupler U2 are connected with a BMQB end of the encoder, one end of a second resistor R2 is connected with the 24V power supply, and the other end of the second resistor R2 is connected with the 3 feet of a second high-speed photoelectric coupler U2 through a light-emitting diode L2.

The 5 feet of the second high-speed photoelectric coupler U2 are grounded, the 6 feet of the second high-speed photoelectric coupler U2 are connected with the 93 feet of the CPU module U15, the 7 feet and the 8 feet of the second high-speed photoelectric coupler U2 are respectively connected with a VCC3.3 power supply, one end of a sixth resistor R6 is connected with the VCC3.3 power supply, and the other end of the sixth resistor R6 is connected with the 6 feet of the second high-speed photoelectric coupler U2.

By such a design, the period and sequence of the encoder input pulses A, B can be detected by the encoder a phase signal detection circuit and the encoder B phase signal detection circuit, and the running speed and direction of the motor can be measured.

As shown in fig. 4 and 21, the encoder return-to-zero circuit includes a fifth photocoupler U5, a sixteenth resistor R16, a twenty-first capacitor C21, and a twenty-first resistor R21.

And a pin 1 of the fifth photoelectric coupler U5 is connected with a sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected with a 24V power supply, and a pin 2 of the fifth photoelectric coupler U5 is connected with a BMQ GL end of the encoder.

The pin 3 of the fifth photoelectric coupler U5 is grounded, and the pin 4 of the fifth photoelectric coupler U5 is connected with the pin 32 of the CPU module U15.

One end of the twenty-first capacitor C21 and one end of the twenty-first resistor R21 are connected with the 4 pin of the fifth photoelectric coupler U5, the other end of the twenty-first capacitor C21 is grounded, and the other end of the twenty-first resistor R21 is connected with a VCC3.3 power supply.

As shown in fig. 1, an output end of the CPU module U15 is electrically connected to a motor control unit for controlling a motor to work, the motor control unit includes a motor speed regulation module and a forward/reverse rotation control module, and an input end of the CPU module U15 is electrically connected to a motor speed regulation input module for regulating and controlling a motor speed.

As shown in fig. 1, 5-6 and 21, the forward/reverse rotation control module includes a forward rotation control circuit and a reverse rotation control circuit, and the forward rotation control circuit includes a twelfth photocoupler U12, a twenty-eighth resistor R28, a thirty-eleventh resistor R31, a thirty-fourth resistor R34, a second protection diode D2, a first driving transistor Q1, and a first switch K1.

A pin 1 of the twelfth photoelectric coupler U12 is connected with a twenty-eighth resistor R28, the other end of the twenty-eighth resistor R28 is connected with a VCC3.3 power supply, a pin 2 of the twelfth photoelectric coupler U121 is connected with a pin 79 of the CPU module U15, one end of a thirty-fourth resistor R34 is connected with a pin 3 of the twelfth photoelectric coupler U12, and the other end of the thirty-fourth resistor R34 is grounded.

The base electrode of the first driving triode Q1 is connected with the pin 3 of the twelfth photoelectric coupler U12, the emitting electrode of the first driving triode Q1 is grounded, the collecting electrode of the first driving triode Q1 is connected with the coil of the motor, and the other end of the coil of the motor is connected with a VCC24 power supply.

An anode end of the second protection diode D2 is connected with a collector electrode of the first driving triode Q1, and a cathode end of the second protection diode D2 is connected with a line inlet end of the thirty-first resistor R31.

The wire inlet end of the thirty-first resistor R31 is connected with a VCC24 power supply, and the other end of the thirty-first resistor R31 is connected with a pin 4 of a twelfth photocoupler U12.

The first switch K1 is used for controlling whether a coil of the motor is electrified or not, an incoming line end of the first switch K1 is electrically connected with 4 pins of a motor wiring terminal, and two outgoing line ends of the first switch K1 are respectively connected with an M-pin and an M + pin of the motor.

As shown in fig. 6 and 21, the inversion control circuit includes a seventeenth photo coupler U17, a fifty-th resistor R50, a fifty-first resistor R51, a fifty-second resistor R52, a fifth protection diode D5, a fifth driving transistor Q3, and a fourth switch K4.

The pin 1 of the seventeenth photoelectric coupler U17 is connected with a fifty-th resistor R50, the other end of the fifty-th resistor R50 is connected with a VCC3.3 power supply, and the pin 2 of the seventeenth photoelectric coupler U17 is connected with a pin 80 of a CPU module U15.

One end of the fifty-second resistor R52 is connected to pin 3 of the seventeenth photocoupler U17, and the other end of the fifty-second resistor R52 is grounded.

The base electrode of the fifth driving triode Q3 is connected with the pin 3 of the seventeenth photoelectric coupler U17, the emitter electrode of the fifth driving triode Q3 is grounded, and the collector electrode of the fifth driving triode Q3 is connected with the other end of the coil motor coil of the motor and is connected with a VCC24 power supply.

An anode terminal of the fifth protection diode D5 is connected to a collector of the fifth driving transistor Q3, and a cathode terminal of the fifth protection diode D5 is connected to a line inlet terminal of the fifty-first resistor R51.

The wire inlet end of the fifty-first resistor R51 is connected with a VCC24 power supply, and the other end of the fifty-first resistor R51 is connected with a pin 4 of a seventeenth photoelectric coupler U17.

The fourth switch K4 is used for controlling whether a coil of the motor is electrified or not, the wire inlet end of the fourth switch K4 is electrically connected with the 3 pins of the motor wiring terminal, and the two wire outlet ends of the first switch K1 are respectively connected with the M-pin and the M + pin of the motor.

Through the design, the CPU module U15 can send out an instruction and can control the motor to rotate forwards and backwards through the forward transmission control circuit or the reverse rotation control circuit, and when the motor rotates forwards and backwards, the ventilation cabinet door can be driven to move upwards or downwards through the transmission assembly.

The power supply of 24V is connected to pin 1 of the motor wiring terminal, the zero line or grounding is connected to

pins

2 and 5 of the motor wiring terminal, and pin 6 of the motor wiring terminal is connected with a control module of the electromagnetic clutch.

As shown in fig. 7 and fig. 21, the motor speed regulation input module includes a potentiometer R64, a sixty-five resistor R65, and a forty-first capacitor C41.

The pin at the upper end of the potentiometer R64 is connected with the pin 21 of the CPU module U15, the pin at the lower end of the potentiometer R64 is grounded, the pin in the middle of the potentiometer R64 is connected with the sixty-five resistor R65, and the other end of the sixty-five resistor R65 is connected with the pin 26 of the CPU module U15.

The intermediate pin of the potentiometer R64 is connected to the forty-first capacitor C41, and the other end of the forty-first capacitor C41 is grounded.

By the design, an accurate voltage can be output through the pin 21 of the CPU module U15, the voltage can be adjusted through the potentiometer R64, and the voltage is transmitted to the pin 26 of the CPU module U15 through the sixteenth resistor R65, at the moment, the CPU module U15 can know a voltage signal adjusted by the potentiometer R64, and at the moment, the CPU module U15 regulates and controls the rotating speed of the motor through the voltage signal.

As shown in fig. 8 and 21, the motor speed regulation module includes a high-speed photocoupler U20, a tenth capacitor C10, a sixth protection diode D6, a fifty-seventh resistor R57, a seventh zener diode D7, a MOS transistor Q10, a forty-capacitor C40, a fifty-sixth resistor R56, an eighth protection diode D8, a ninth protection diode D9, a diode K, and a twenty-eighth polarized capacitor C28.

The 2 pin of the high-speed photoelectric coupler U20 is connected with the 91 pin of the CPU module U15, the 3 pin of the high-speed photoelectric coupler U20 is connected with a fifty-fourth resistor R54, and the other end of the fifty-fourth resistor R54 is grounded.

The 5 pin of the high-speed photocoupler U20 is grounded.

The pin 6 of the high-speed photoelectric coupler U20 is connected with a fifty-seventh resistor R57, the other end of the fifty-seventh resistor R57 is connected with the anode end of a sixth protection diode D6, and the cathode end of the sixth protection diode D6 is connected with the connection position of the fifty-seventh resistor R57 and the pin 6 of the high-speed photoelectric coupler U20.

The pin 8 of the high-speed photoelectric coupler U20 outputs 12V power, the pin 8 of the high-speed photoelectric coupler U20 is connected with a tenth capacitor C10, and a tenth capacitor C10 is grounded.

The other end of the fifty-seventh resistor R57 is connected with the G pole of the MOS tube Q10, the D pole of the MOS tube Q10 is connected with the M-pin of the motor, and the S pole of the MOS tube Q10 is grounded.

The other end of the fifty-seventh resistor R57 is connected to the cathode terminal of the seventh zener diode D7, and the anode terminal of the seventh zener diode D7 is grounded.

And a fifty-sixth resistor R56 is connected to the M-pin of the motor, the other end of the fifty-sixth resistor R56 is connected with a forty-th capacitor C40, and the other end of the forty-th capacitor C40 is connected with the fourth capacitor.

The M-pin of the motor is connected with the cathode end of an eighth protection diode D8, and the anode end of an eighth protection diode D8 is grounded.

And the anode end of the diode K is connected with the M-pin of the motor, and the cathode end of the diode K is connected with the M + pin of the motor.

The anode of the ninth protection diode Q9 is connected with a VCC24 power supply, and the cathode of the ninth protection diode Q9 is connected with the M + pin of the motor.

One end of the twenty-eighth polar capacitor C28 is connected to the cathode of the ninth protection diode Q9, and the other end of the twenty-eighth polar capacitor C28 is grounded.

And a fifty-fifth resistor R55 is connected to the M + pin of the motor, the other end of the fifty-fifth resistor R55 is connected with a thirty-ninth capacitor C39, and the other end of the thirty-ninth capacitor C39 is connected with the M-pin of the motor.

As shown in fig. 1, the power output end of the motor is connected with an electromagnetic clutch, and the input end of the electromagnetic clutch is connected with the output end of the CPU module U15 through an electromagnetic clutch control circuit.

As shown in fig. 9 and 21, the electromagnetic clutch control circuit includes a thirteenth photocoupler U13, a twenty-ninth resistor R29, a thirty-second resistor R32, a thirty-fifth resistor R35, a second driving transistor Q2, a third protection diode D3, a second switch K2, and a forty-second capacitor C42.

And a pin 1 of the thirteenth photoelectric coupler U13 is connected with a twenty-ninth resistor R29, the other end of the twenty-ninth resistor R29 is connected with a VCC3.3 power supply, and a pin 2 of the thirteenth photoelectric coupler U13 is connected with a pin 78 of the CPU module U15.

And a pin 4 of the thirteenth photocoupler U13 is connected with a thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected with a VCC24 power supply.

And the pin 3 of the thirteenth photocoupler U13 is connected with a thirty-fifth resistor R35, and two ends of the thirty-fifth resistor R35 are grounded.

The base electrode of the second driving triode Q2 is connected with the pin 3 of the thirteenth photocoupler U13, the collector electrode of the second driving triode Q2 is connected with the anode end of the third protection diode D3, the cathode end of the third protection diode D3 is connected with a VCC24 power supply and a relay, the collector electrode of the second driving triode Q2 is connected with a relay, and the emitter electrode of the second driving triode Q2 is grounded.

The second switch K2 is controlled by the relay, the incoming line termination VCC24 power of relay, the outgoing line termination of relay second drive triode Q2's collecting electrode.

One end of the second switch K2 is connected with a VCC24 power supply, and the other end of the second switch K2 is connected with the control end of the electromagnetic clutch.

One end of the forty-second capacitor C42 is connected with a VCC24 power supply, and the other end of the forty-second capacitor C42 is connected with the second switch K2 and the control end of the electromagnetic clutch.

The CPU module sends a signal to control the electromagnetic clutch to be closed through the electromagnetic clutch control circuit so as to output power.

As shown in fig. 1, the signal input terminal of the CPU module U15 is electrically connected to a manual control unit, the manual control unit includes an up button, a down button and a stop button, and the up button, the down button and the stop button are respectively electrically connected to the signal input terminal of the CPU module U15.

The ascending button and the descending button can send out operation instructions, so that the CPU module U15 sends out signals to control the motor to rotate forward and backward, and then the ventilation cabinet door is driven to ascend or descend.

The stop button can send out operating command, makes CPU module U15 send signal control motor stall, realizes controlling the position of ventilation cabinet door at will.

As shown in fig. 10 and 21, the uplink button is electrically connected to the signal input terminal of the CPU module U15 through an uplink control circuit, and the uplink control circuit includes a seventeenth resistor R17, a sixth photocoupler U6, a twenty-second resistor R22, and a twenty-second capacitor R22.

And a pin 1 of the sixth photoelectric coupler U6 is connected with a seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected with a VCC12 power supply, a pin 2 of the sixth photoelectric coupler U6 is connected with an uplink button, the other end of the uplink button is grounded, and the uplink button can be fixedly mounted on the ventilation cabinet body.

One end of the twenty-second resistor R22 is connected with a VCC3.3 power supply, the other end of the twenty-second resistor R22 is connected with the twenty-second capacitor R22, and the other end of the twenty-second capacitor R22 is grounded.

And a pin 3 of the sixth photoelectric coupler U6 is connected with a twenty-second capacitor R22 and the ground, and a pin 4 of the sixth photoelectric coupler U6 is connected with a twenty-second resistor R22, a twenty-second capacitor R22 and a pin 33 of the CPU module U15.

By the design, when the uplink button is pressed down, a VCC12 power supply, a seventeenth resistor R17, a sixth photoelectric coupler U6 and the ground form an electric loop, at the moment, the sixth photoelectric coupler U6 generates an optical signal and sends the optical signal to the CPU module U15, and at the moment, the CPU module U15 receives a signal to control the motor to rotate positively to drive the ventilation cabinet door to ascend.

As shown in fig. 11 and 21, the down button is electrically connected to the signal input terminal of the CPU module U15 through a down control circuit, which includes a nineteenth resistor R19, an eighth photocoupler U8, a twenty-fourth resistor R24, and a twenty-fourth capacitor C24.

And a pin 1 of the eighth photoelectric coupler U8 is connected with a nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected with a VCC12 power supply, a pin 2 of the eighth photoelectric coupler U8 is connected with a descending button, the other end of the descending button is grounded, and the descending button can be fixedly installed on the ventilation cabinet body.

One end of the twenty-fourth resistor R24 is connected with a VCC3.3 power supply, the other end of the twenty-fourth resistor R24 is connected with a twenty-fourth capacitor C24, and the other end of the twenty-fourth capacitor C24 is grounded.

And a pin 3 of the eighth photoelectric coupler U8 is connected with a twenty-fourth capacitor C24 and the ground, and a pin 4 of the eighth photoelectric coupler U8 is connected with a twenty-fourth resistor R24, a twenty-fourth capacitor C24 and a pin 34 of the CPU module U15.

By the design, when a descending button is pressed, a VCC12 power supply, a nineteenth resistor R19, an eighth photoelectric coupler U8 and the ground form an electric loop, at the moment, the eighth photoelectric coupler U8 generates an optical signal and sends the optical signal to a CPU module U15, and at the moment, the CPU module U15 receives a signal to control the motor to reversely rotate, so that the door of the ventilation cabinet is driven to descend.

As shown in fig. 12 and 21, the stop button is electrically connected to the signal input terminal of the CPU module U15 through a stop control circuit, and the stop control circuit includes a twentieth resistor R20, a ninth photocoupler U9, a twenty-fifth resistor R25, and a twenty-fifth capacitor C25.

And a pin 1 of the ninth photoelectric coupler U9 is connected with a twentieth resistor R20, the other end of the twentieth resistor R20 is connected with a VCC12 power supply, a pin 2 of the ninth photoelectric coupler U9 is connected with a stop button, the other end of the stop button is grounded, and the stop button can be fixedly mounted on the ventilation cabinet body.

One end of the twenty-fifth resistor R25 is connected with a VCC3.3 power supply, the other end of the twenty-fifth resistor R25 is connected with the twenty-fifth capacitor C25, and the other end of the twenty-fifth capacitor C25 is grounded.

And a pin 3 of the ninth photoelectric coupler U9 is connected with a twenty-fifth capacitor C25 and the ground, and a pin 4 of the ninth photoelectric coupler U9 is connected with a twenty-fifth resistor R25, a twenty-fifth capacitor C25 and a pin 44 of the CPU module U15.

Design like this, when pressing the stop button, VCC12 power, twentieth resistance R20, ninth photoelectric coupler U9 and ground connection constitute the electric loop in the time, and ninth photoelectric coupler U9 produces the light signal this moment to send CPU module U15, and CPU module U15 accepts signal control motor stall this moment, realizes the position of fixing a position ventilation cabinet door at will.

As shown in fig. 1, the output end of the CPU module U15 is electrically connected with an indicator light prompting unit for checking the operation state of the door of the ventilation cabinet, and the indicator light prompting unit includes an ascending indicator light, a descending indicator light, a door closing indicator light, and a work indicator light.

The input ends of the ascending indicator light, the descending indicator light, the door closing indicator light and the working indicator light are respectively and electrically connected with the output end of the CPU module U15.

When the CPU module U15 sends out an instruction to control the ventilation cabinet door to ascend, descend or close or a user is realizing operation, the CPU module U15 controls the corresponding ascending indicator light, descending indicator light, door closing indicator light or working indicator light to light up for prompting the user.

As shown in fig. 1, the output end of the CPU module U15 is electrically connected to a buzzer, which is available in the prior art and can be purchased directly from the market, and which is simple and low in cost. The buzzer is arranged at the top or one side of the fume chamber, so long as safety and convenience are guaranteed.

As shown in fig. 13 and 21, the buzzer is electrically connected to the output end of the CPU module U15, and when the CPU module U15 controls the ventilation cabinet door to ascend or descend to the limit position, the CPU module U15 sends a signal to control the buzzer to alarm.

The buzzer is electrically connected with the CPU module U15 through a buzzer alarm circuit, and the buzzer alarm circuit comprises a buzzer U24, a tenth protection diode D10, a twelfth driving triode Q12, a sixty-third resistor R63 and a sixty resistor R60.

An anode end of the tenth protection diode D10 and a collector electrode of the twelfth driving triode Q12 are respectively connected with a pin 2 of the buzzer U24, a cathode end of the tenth protection diode D10 is connected with a pin 1 of the buzzer U24, and a pin 1 of the buzzer U24 is connected with a 3.3V power supply.

The base of the twelfth driving triode Q12 is connected with the sixty-three resistor R63, and the other end of the sixty-three resistor R63 is connected with the pin 70 of the CPU module U15.

One end of the sixteenth resistor R60 is connected to the base of the twelfth driving transistor Q12, the other end of the sixteenth resistor R60 is grounded, and the emitter of the twelfth driving transistor Q12 is grounded.

As shown in fig. 1, the detection sensor group includes a human body sensor and an obstacle sensor, and output ends of the human body sensor and the obstacle sensor are respectively electrically connected to the CPU module U15.

The human body inductor is arranged on the ventilation cabinet and used for detecting whether a user carries out experimental work on the front side of the ventilation cabinet, and a detection signal of the human body inductor is transmitted to the CPU module U15.

The obstacle sensor is arranged in a window frame of the fume hood and used for detecting whether an obstacle exists in the window frame of the fume hood or not, and a detection signal of the obstacle sensor is sent to the CPU module U15.

The obstacle sensor adopts an infrared correlation sensor.

As shown in fig. 14 and 21, the obstacle sensor is electrically connected to the input terminal of the CPU module U15 through an obstacle sensor circuit, and the obstacle sensor circuit includes an eleventh photocoupler U11, a twenty-sixth resistor R26, a twenty-seventh resistor R27, and a twenty-seventh capacitor C27.

One end of the twenty-sixth resistor R26 is connected with a 24V power supply, the other end of the twenty-sixth resistor R26 is connected with a pin 1 of an eleventh photoelectric coupler U11, and a pin 2 of the eleventh photoelectric coupler U11 is connected with the output end of the obstacle sensor.

A pin 3 of the eleventh photoelectric coupler U11 is grounded, one ends of the twenty-seventh resistor R27 and the twenty-seventh capacitor C27 are respectively connected to a pin 4 of the eleventh photoelectric coupler U11, the other end of the twenty-seventh resistor R27 is connected to a VCC3.3 power supply, and the other end of the twenty-seventh capacitor C27 is grounded.

And the 4 pin of the eleventh photoelectric coupler U11 is connected with the 51 pin of the CPU module U15.

As shown in fig. 15 and 21, the human body sensor is electrically connected to the input terminal of the CPU module U15 through the human body sensor circuit, the human body sensor senses whether a person operates the ventilation hood, and a human body sensor detection signal is transmitted to the CPU module U15 through the human body sensor circuit.

The human body sensor circuit comprises an eighteenth resistor R18, a seventh photoelectric coupler U7, a twenty-third resistor R23 and a twenty-third capacitor C23.

And a pin 1 of the seventh photoelectric coupler U7 is connected with an eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected with a +24V power supply, and a pin 2 of the seventh photoelectric coupler U7 is connected with a human body inductor.

One end of the twenty-third resistor R23 is connected with a VCC3.3 power supply, the other end of the twenty-third resistor R23 is connected with a twenty-third capacitor C23, and the other end of the twenty-third capacitor C23 is grounded.

And a pin 3 of the seventh photoelectric coupler U7 is connected with a twenty-third capacitor C23 and the ground, and a pin 4 of the seventh photoelectric coupler U7 is connected with a twenty-third resistor R23, a twenty-third capacitor C23 and a pin 35 of the CPU module U15.

Design like this, the accessible +24V power supplies power for human inductor in real time, and when fume chamber department had the people operation, the human inductor made seventh optoelectronic coupler U7 produce the light signal after detecting the signal to send to CPU module U15, CPU module U15 received the signal this moment and judges that someone is operating this fume chamber.

As shown in fig. 16 and 21, an output end of the CPU module U15 is electrically connected to a fume hood operation prompting circuit, and the fume hood operation prompting circuit is connected to a signal lamp.

The fume hood operation prompting circuit comprises a fourteenth photoelectric coupler U14, a thirtieth resistor R30, a thirty-third resistor R33, a thirty-sixth resistor R36, a third driving triode Q3, a fourth protection diode D4 and a third switch K3.

One end of the thirtieth resistor R30 is connected with a VCC3.3 power supply, and the other end of the thirtieth resistor R30 is connected with pin 1 of the fourteenth photoelectric coupler U14.

The 2 pin of the fourteenth photocoupler U14 is connected to the 52 pin of the CPU module U15.

And a pin 3 of the fourteenth photoelectric coupler U14 is connected with a thirty-sixth resistor R36, the other end of the thirty-sixth resistor R36 is grounded, a pin 4 of the fourteenth photoelectric coupler U14 is connected with a thirty-third resistor R33, and the other end of the thirty-third resistor R33 is connected with a VCC24 power supply.

The base electrode of the third driving triode Q3 is connected with the pin 3 of the fourteenth photoelectric coupler U14, the emitter electrode of the third driving triode Q3 is grounded, the collector electrode of the third driving triode Q3 is connected with the anode end of the fourth protection diode D4, and the cathode electrode of the fourth protection diode D4 is connected with one end of a thirty-third resistor R33 connected with a VCC24 power supply.

The third switch K3 is controlled by a relay, the relay is connected with a VCC24 power supply, and an outlet wire of the relay is connected with an anode end of a fourth protection diode D4 and a collector electrode of a third driving triode Q3.

And the incoming line end and the appearance end of the third switch K3 are respectively connected with a signal lamp, and the signal lamp is powered by a +24V power supply.

The design is that the relay is powered by a VCC24 power supply, so that the third switch K3 is attracted, when the human body inductor acts, the CPU module U15 sends a signal, and a signal lamp on the fume hood operation prompting circuit is turned on at the moment, which represents that a worker operates the fume hood.

As shown in fig. 1, an output end of the CPU module U15 is electrically connected to a data storage module for storing working data and preventing loss of power-down working data.

As shown in fig. 17 and 21, the data saving module includes a semiconductor memory U21, a twentieth capacitor C20, a forty-first resistor R41, a forty-second resistor R42 and a forty-third resistor R43, wherein the model of the semiconductor memory U21 is 24C 16.

Pins

1, 2, 3 and 4 of the semiconductor memory U21 are grounded, pin 5 of the semiconductor memory U21 is connected with pin 97 of the CPU module U15, pin 6 of the semiconductor memory U21 is connected with pin 96 of the CPU module U15, and pin 7 of the semiconductor memory U21 is connected with pin 95 of the CPU module U15.

The 8 pins of the semiconductor memory U21 are connected with a 3.3V power supply, one end of the twentieth capacitor C20 is connected with the 8 pins of the semiconductor memory U21, and the other end of the twentieth capacitor C20 is grounded.

One end of each of the forty-first resistor R41, the forty-second resistor R42 and the forty-third resistor R43 is connected with a 3.3V power supply, the other end of the forty-first resistor R41 is connected with a pin 6 of the semiconductor memory U21, and the other end of the forty-second resistor R42 is connected with a pin 5 of the semiconductor memory U21; the other end of the forty-third resistor R43 is connected to pin 7 of the semiconductor memory U21.

The working data of the CPU module U15 are sent to the semiconductor memory U21 of the data storage module in real time for storage, so that the power failure of the fume hood during working is prevented, and the loss of the working data is avoided.

As shown in fig. 1, an output end of the CPU module U15 is electrically connected to an external power supply for outputting a 24V power, the external power supply is used by an external indicator light, and the external indicator light is used for indicating that the fume hood is being operated by someone.

The outside pilot lamp can set up outside the laboratory for the suggestion, and this fume chamber is having someone to carry out the operation experiment.

As shown in fig. 18 and 21, the external power supply includes a twenty-third photocoupler U23, a fifty-eighth resistor R58, a fifty-ninth resistor R59, an eleventh driving transistor Q11, a sixty-second resistor R62, a ninth protection diode D9, and a fifth switch K5.

One end of the fifty-eighth resistor R58 is connected with a VCC3.3 power supply, the other end of the fifty-eighth resistor R58 is connected with a pin 1 of the twenty-third photoelectric coupler U23, and a pin 2 of the twenty-third photoelectric coupler U23 is connected with a pin 5 of the CPU.

One end of the fifty-ninth resistor R59 is connected with a 24V power supply, and the other end of the fifty-ninth resistor R59 is connected with the 4 th pin of the twenty-third photocoupler U23.

One end of the sixty-second resistor R62 is connected with the pin 3 of the twenty-third photocoupler U23, and the other end of the sixty-second resistor R62 is grounded.

The base electrode of the eleventh driving triode Q11 is connected with the pin 3 of the twenty-third photocoupler U23, the emitter electrode of the eleventh driving triode Q11 is grounded, the collector electrode of the eleventh driving triode Q11 is connected with the anode end of the ninth protection diode D9, and the cathode end of the ninth protection diode D9 is connected with the connection part of the fifty-ninth resistor R59 and the 24V power supply.

The fifth switch K5 is controlled by a relay, the relay is connected with a +24 power supply, and an outlet wire of the relay is connected with an anode end of a ninth protective diode D9 and a collector electrode of an eleventh driving triode Q11.

Both ends of the fifth switch K5 output +24V power.

The CPU module U15 is connected with a communication module which is used for networking the working state of the CPU module U15 in real time and sending the working state to a monitoring room, and the communication module is networked by adopting an RS232 communication interface.

As shown in fig. 1 and fig. 19 to 21, the CPU module U15 is powered by a power supply part, and the power supply part includes a fuse F1, a diac D1, a first pi filter, a seventh polar capacitor EC7, a dc power converter chip U3, a third inductor L3, an eleventh protection diode D11, a second pi filter, a twelfth inductor L12, a forty-third capacitor C43, a low dropout linear regulator U4, and a twenty-sixth capacitor C26, where the first pi filter is used for outputting a 24V power supply, and the second pi filter is used for outputting a 12V power supply.

The type of the direct-current power supply converter chip U3 is as follows: XL2596S-12E 1; the low dropout regulator U4 has the following model: ME6210a33 PG.

One end of the fuse F1 is connected with a 24V power supply, the other end of the fuse F1 is connected with a diac D1, the other end of the diac D1 is grounded, and the other end of the fuse F1 outputs a VCC24 power supply.

The first pi-shaped filter comprises a first polar capacitor EC1, a first capacitor C1, a seventh inductor L7, an eighth inductor L8, a second polar capacitor EC2 and a second capacitor C2.

The first polar capacitor EC1 and the first capacitor C1 are arranged in parallel, one end of the first polar capacitor EC1 and one end of the first capacitor C1 are connected with a VCC24 power supply output by a fuse F1, and the other end of the first polar capacitor EC1 and the other end of the first capacitor C1 are grounded.

The seventh inductor L7 and the eighth inductor L8 are arranged in parallel, one end of the seventh inductor L7 is connected to a VCC24 power supply, and the other end of the seventh inductor L7 is connected to the anode of the second polar capacitor EC2 and the second capacitor C2.

One end of the eighth inductor L8 is connected to the first capacitor C1, and the other end of the eighth inductor L8 is connected to the second polarized capacitor EC 2.

One end of the seventh polar capacitor EC7 is connected to the connection point of the second polar capacitor EC2 and the second capacitor C2, the other end of the seventh polar capacitor EC7 is connected to the other end of the second capacitor C2, and the other end of the seventh polar capacitor EC7 is grounded.

One end of the second capacitor C2 is connected with a 24V power supply.

The pin 1 of the DC power converter chip U3 is connected with a 24V power supply, the

pins

3 and 5 of the DC power converter chip U3 are connected with one end of the eighth inductor L8 far away from the first capacitor C1,

and a pin 2 of the direct-current power converter chip U3 is connected with a third inductor L3, and one end of the third inductor L3 is connected with a pin 4 of the direct-current power converter chip U3.

And the 4-pin output VCC12 power supply of the DC power converter chip U3.

The anode of the eleventh protection diode D1 is connected with the pin 5 of the DC power converter chip U3, and the cathode of the eleventh protection diode D1 is connected with the pin 2 of the DC power converter chip U3.

The second pi-shaped filter comprises a third polar capacitor EC3, a third capacitor C3, a ninth inductor L9, a tenth inductor L10, a fourth polar capacitor EC4 and a fourth capacitor C4.

An anode end of the eleventh protection diode D1 is connected to one end of a third polar capacitor EC3 and one end of a third capacitor C3, respectively, the other end of the third polar capacitor EC3 and the other end of the third capacitor C3 are connected to a VCC12 power supply, and one end of the third polar capacitor EC3 and one end of the third capacitor C3 are grounded.

One end of the tenth inductor L10 is connected to one end of the third polar capacitor EC3 and one end of the third capacitor C3, respectively, and the other end of the tenth inductor L10 is connected to the fourth polar capacitor EC4, the fourth capacitor C4 and the ground of the forty-third capacitor C43.

One end of the ninth inductor L9 is connected to the forty-third capacitor C43 and the twelfth inductor L12, and the other end of the ninth inductor L9 outputs 12V power.

The other end of the fourth polar capacitor EC4 and the other end of the fourth capacitor C4 are connected with a twelfth inductor L12.

And a 2 pin of the low dropout linear regulator U4 is connected with a fourth polar capacitor EC4, a fourth capacitor C4 and a twelfth inductor L12.

And the pin 1 of the low dropout regulator U4 is grounded.

3 pin connection 3.3V power and the connection twenty-sixth electric capacity C26 of low dropout linear voltage regulator U4, VCC3.3 power is connected to the top of twenty-sixth electric capacity C26, the other end ground connection of twenty-sixth electric capacity C26.

The CPU module U15 has the following model: STM32F103VCT 6.

The pin 20 of the CPU module U15 is grounded, the pin 6 of the CPU module U15 is grounded to the twelfth capacitor C12, and the other end of the twelfth capacitor C12 is grounded.

The pin 50, the pin 75, the pin 100, the pin 28 and the pin 11 of the CPU module U15 are connected with a +3.3V power supply, the pin 22 of the CPU module U15 is connected with a seventh capacitor C7 and an eleventh inductor L11, the other end of the seventh capacitor C7 is grounded, and the other end of the eleventh inductor L11 is connected with the +3.3V power supply.

Pins

49, 74, 99, 27, 10 and 19 of the CPU module U15 are grounded.

By adopting the technical scheme, the anti-pinch device is ingenious in conception and reasonable in structure, the encoder can be used for detecting the rotation angle and the number of turns of the motor, the CPU module U15 can calculate the specific position of the ventilation cabinet door according to the rotation angle and the number of turns of the motor detected by the encoder, the specific position of the ventilation cabinet door can be monitored in real time, the anti-pinch device is convenient to use, and the encoder is used for detecting the steering of the motor, so that whether obstacles block the ventilation cabinet door driven by the motor to lift or not can be judged according to the steering, and the anti-pinch function is realized.

And can carry out multiple filtering to input power through the power part, prevent to the influence of CPU module U15 power supply circuit when the motor starts, stops, prevent that the heavy current from burning out CPU module U15, convenient to use can improve the accuracy of detection data, facilitates the use.

It will be apparent to those skilled in the art that changes, modifications, substitutions and variations can be made in the embodiments without departing from the scope of the invention.

Claims

1. The utility model provides a ventilation cabinet door automated control system, includes the motor, its characterized in that: the control end electric connection of motor carries out just, the CPU module (U15) of reversal and slew velocity, the input electric connection of CPU module (U15) has the encoder that is used for automatic detection motor to turn to and speed and turned angle and number of turns, the encoder passes through the input electric connection of encoder control circuit and CPU module (U15), the encoder is used for detecting the turned angle and the number of turns of motor, make CPU module (U15) calculate the concrete position of ventilation cabinet door according to the turned angle and the number of turns of the motor that the encoder detected to obtain, the encoder is used for detecting turning to of motor makes CPU module (U15) according to should turning to, when judging motor drive ventilation cabinet door and going up and down, whether have the blockking of barrier, the input electric connection of CPU module (U15) has the detection sensor group.

2. The automated control system of a ventilation cabinet door according to claim 1, wherein: the CPU module (U15) adopts the following types: STM32F103VCT 6.

3. The automated control system for a ventilation cabinet door according to claim 2, wherein: the encoder control circuit comprises an encoder A phase signal detection circuit, an encoder B phase signal detection circuit and an encoder zeroing circuit.

4. The automated control system of a ventilation cabinet door according to claim 3, wherein: the encoder A phase signal detection circuit comprises a first high-speed photoelectric coupler (U1), a first resistor (R1), a third resistor (R3), a fifth resistor (R5) and a light emitting diode (L1), wherein the model of the first high-speed photoelectric coupler (U1) is 6N 137S;

a pin 2 of the first high-speed photoelectric coupler (U1) is connected with a 24V power supply through a third resistor (R3), a pin 3 of the first high-speed photoelectric coupler (U1) is connected with a BMQA end of the encoder, one end of the first resistor (R1) is connected with the 24V power supply, and the other end of the first resistor (R1) is connected with a pin 3 of the first high-speed photoelectric coupler (U1) through a light-emitting diode (L1);

the 5 feet of the first high-speed photoelectric coupler (U1) are grounded, the 6 feet of the first high-speed photoelectric coupler (U1) are connected with the 92 feet of the CPU module (U15), the 7 feet and the 8 feet of the first high-speed photoelectric coupler (U1) are respectively connected with a VCC3.3 power supply, one end of the fifth resistor (R5) is connected with the VCC3.3 power supply, and the other end of the fifth resistor (R5) is connected with the 6 feet of the first high-speed photoelectric coupler (U1).

5. The automated control system of a ventilation cabinet door according to claim 4, wherein: the encoder B-phase signal detection circuit comprises a second high-speed photoelectric coupler (U2), a second resistor (R2), a fourth resistor (R4), a sixth resistor (R6) and a light-emitting diode (L2), wherein the model of the second high-speed photoelectric coupler (U2) is 6N 137S;

a pin 2 of the second high-speed photoelectric coupler (U2) is connected with a 24V power supply through a fourth resistor (R4), a pin 3 of the second high-speed photoelectric coupler (U2) is connected with a BMQB end of the encoder, one end of the second resistor (R2) is connected with the 24V power supply, and the other end of the second resistor (R2) is connected with a pin 3 of the second high-speed photoelectric coupler (U2) through a light-emitting diode (L2);

the pin 5 of the second high-speed photoelectric coupler (U2) is grounded, the pin 6 of the second high-speed photoelectric coupler (U2) is connected with the pin 93 of the CPU module (U15), the pin 7 and the pin 8 of the second high-speed photoelectric coupler (U2) are respectively connected with a VCC3.3 power supply, one end of a sixth resistor (R6) is connected with the VCC3.3 power supply, and the other end of the sixth resistor (R6) is connected with the pin 6 of the second high-speed photoelectric coupler (U2).

6. The automated control system of a ventilation cabinet door according to claim 5, wherein: the encoder zeroing circuit comprises a fifth photoelectric coupler (U5), a sixteenth resistor (R16), a twenty-first capacitor (C21) and a twenty-first resistor (R21);

a pin 1 of the fifth photoelectric coupler (U5) is connected with a 24V power supply through a sixteenth resistor (R16), and a pin 2 of the fifth photoelectric coupler (U5) is connected with a BMQ GL end of the encoder; the 3 pin of the fifth photoelectric coupler (U5) is grounded, and the 4 pin of the fifth photoelectric coupler (U5) is connected with the 32 pin of the CPU module (U15);

one end of the twenty-first capacitor (C21) and one end of the twenty-first resistor (R21) are connected with the 4 pin of the fifth photoelectric coupler (U5), the other end of the twenty-first capacitor (C21) is grounded, and the other end of the twenty-first resistor (R21) is connected with a VCC3.3 power supply.

7. The automated control system of a ventilation cabinet door according to claim 6, wherein: the output end of the CPU module (U15) is electrically connected with a motor control unit for controlling the motor to work, the motor control unit comprises a motor speed regulation module and a forward and reverse rotation control module, and the input end of the CPU module (U15) is electrically connected with a motor speed regulation input module for regulating and controlling the rotating speed of the motor.

8. The automated control system for a ventilation cabinet door according to claim 7, wherein: the signal input end of the CPU module (U15) is electrically connected with a manual control unit, the manual control unit comprises an uplink button, a descending button and a stop button, the uplink button is electrically connected with the signal input end of the CPU module (U15) through an uplink control circuit, the descending button is electrically connected with the signal input end of the CPU module (U15) through a descending control circuit, and the stop button is electrically connected with the signal input end of the CPU module (U15) through a stop control circuit.

9. The automated control system for a ventilation cabinet door according to claim 8, wherein: the output end of the CPU module (U15) is electrically connected with a buzzer, the buzzer is electrically connected with the CPU module (U15) through a buzzer alarm circuit, and when the CPU module (U15) controls the ventilation cabinet door to ascend or descend to an extreme position, the CPU module (U15) sends a signal to control the buzzer to alarm.

10. The automated control system for a ventilation cabinet door according to claim 9, wherein: the detection sensor group comprises a human body sensor and an obstacle sensor, the obstacle sensor is electrically connected with the input end of the CPU module (U15) through an obstacle sensor circuit, and the human body sensor is electrically connected with the input end of the CPU module (U15) through a human body sensor circuit.