CN107097407B - Method, application and device for intelligently monitoring the working status of 3D printing nozzles - Google Patents

Abstract

The invention discloses a method, application and device for intelligently monitoring the working state of the nozzle of 3D printing. Aiming at the requirement of 3D printing of hydrogel and other materials to improve the printing success rate, a method and device for intelligently monitoring the 3D printing form are constructed. structure. The intelligent monitoring system for 3D printing of conductive gel materials of the present invention includes a nozzle monitoring circuit, a CPU control unit, a photosensitive sensor module, an adjustment device, and a feeding device. The invention monitors the printing process in real time through the nozzle monitoring circuit, and sends a signal to the CPU unit for timely adjustment when a fault occurs, making it possible to intelligently monitor the discharge of the nozzle, improve the success rate of printing, thereby improving the printing quality, and manufacturing 3D printing that meets the established requirements product.

Description

Method, application and device for intelligently monitoring the working status of 3D printing nozzles

technical field

The invention relates to a 3D printing process, application and device, in particular to an intelligent 3D printing process, application and device, which are applied in the technical field of additive manufacturing.

Background technique

In recent years, 3D printing technology has gradually integrated into people's daily life. 3D printing technology is a rapid prototyping technology that manufactures three-dimensional objects by layer-by-layer superimposition based on digital model files. It has been widely used in industrial design, medical aviation, precision manufacturing, biological manufacturing and other fields.

Hydrogel material is a new type of biomedical material that is widely used at present. The material has good biocompatibility and can be used in contact with human tissue. It is widely used in the fields of biomedicine, tissue engineering and 3D bioprinting. At the same time, hydrogel materials also have important applications in the fields of drug controlled release and cell culture. The approach of incorporating bioactive genes into self-assembling hydrogels has played an important role in the field of regenerative medicine. Moreover, the source of the hydrogel material is abundant and the price is low. Hydrogel is a kind of gel with water as the dispersion medium, so in actual use, the mixed hydrogel materials are all conductive. The research on hydrogel materials in the field of biomanufacturing is becoming more and more important. However, such materials are prone to swelling, deformation, and difficult to form during the printing process. It is urgent to find a printing solution, and the design of the nozzle part is one of the keys.

In the process of 3D printing of hydrogel materials, the normal discharge of the nozzle is a very important part to ensure the printing quality. If the discharge is not normal, the nozzle will be blocked, and the nozzle will easily form swelling droplets. Adjusting the material mechanism will seriously affect the printing quality, and even cause printing failure. Traditional monitoring mainly uses human eyes to identify whether the output is normal, and monitoring is difficult. Therefore, this puts forward requirements for intelligent monitoring of the printing form of hydrogel materials, and develops a method for monitoring the working status of 3D printing nozzles. And device becomes the technical problem urgently to be solved.

Contents of the invention

In order to solve the problems of the prior art, the purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method, application and device for intelligently monitoring the working state of the 3D printing nozzle, which satisfies the need for 3D printing of materials such as hydrogel to improve In order to meet the requirements of the printing success rate, an intelligent monitoring method and device structure for 3D printing forms have been built, which can monitor the printing process in real time, and make timely adjustments if errors occur during the printing process, making it possible to intelligently monitor the discharge of the nozzle and improve the printing success rate. , to manufacture 3D printed products that meet the established requirements.

In order to achieve the above invention creation purpose, the present invention adopts the following technical solutions:

A method for intelligently monitoring the working state of the nozzle of 3D printing. A nozzle monitoring circuit with a gap is arranged at the front position of the nozzle of the nozzle of the 3D printer, and the gap of the nozzle monitoring circuit does not constitute an obstacle to the normal discharge of the nozzle; Connect the LED light-emitting device into the monitoring circuit, and set up a photosensitive sensor device. The photosensitive sensor device detects the light-emitting status signal of the LED light-emitting device in real time, and sends an acquisition signal to the main controller; the main controller performs calculation and signal processing according to the received signal, and passes Control the feeding device of the 3D printer and adjust the discharge state of the nozzle of the 3D printer; when the photosensitive sensor detects that the LED light-emitting device emits light, the main controller judges that the nozzle monitoring circuit is turned on, and obtains that the position at the front edge of the nozzle of the nozzle is The conclusion that the expanded conductive liquid droplets have been formed, and it is recognized that there is an abnormal state of failure when the nozzle is discharging, at this time, the main controller sends a control signal to control the feeding device, so that the expanded conductive droplets formed at the front edge of the nozzle of the nozzle Disappear, eliminate the faulty working state of the 3D printer, and make the 3D printing work normally.

An application of the method for intelligently monitoring the working state of a 3D printing nozzle of the present invention can be used for intelligently monitoring the 3D printing of hydrogel materials.

An intelligent monitoring system for 3D printing of conductive gel materials, mainly including a CPU control unit, a feeding device and a nozzle of a 3D printer, and a power supply end. The unit controls the feeding work of the feeding device. The feeding device performs the discharging work through the nozzle, and the power supply supplies power for each electronic device. The intelligent monitoring system also includes a sensor device, which will collect the output status of the nozzle The information is transmitted to the CPU control unit. The sensing device is mainly composed of a nozzle monitoring circuit, an LED light, a photosensitive sensor module and a power supply terminal. The nozzle monitoring circuit is composed of two parts: a grounding circuit and a sensing working circuit. One end of the grounding circuit is Connected to the ground terminal, the other end of the ground terminal circuit is set at the nozzle position of the nozzle of the 3D printer to form the first open circuit end, and one end of the sensing working circuit is electrically connected to the power supply terminal, and the other end of the sensing working circuit is set on the 3D printer. The nozzle position of the print head of the printer forms a second open-circuit end, and the LED light is set in the print head monitoring circuit as a photoelectric element, and the two open-circuit ends of the ground terminal circuit and the sensing working circuit are arranged on the print head of the 3D printer in a non-contact form. At the position of the nozzle, a circuit gap is formed between the two open ends of the ground terminal circuit and the sensing working circuit, if and only when an expanding conductive droplet is formed at the front edge of the nozzle of the nozzle of the 3D printer, And when the ground terminal circuit and the two open ends of the sensing working circuit are infiltrated with the conductive liquid droplet at the same time, the two open ends of the grounding terminal circuit and the sensing working circuit are electrically connected, so that the nozzle monitoring circuit is connected to the ground terminal. A conductive path is formed between the nozzle and the power supply end, so that the nozzle monitoring circuit forms a closed circuit and a conductive working circuit, and the LED light emits light at this time; the photosensitive sensor module and the LED light are installed together, and the signal output terminal of the photosensitive sensor module is connected to the CPU control unit. Corresponding to the connection of the signal terminal, the photosensitive sensor module sends a real-time signal to the CPU control unit. The CPU control unit obtains the result through calculation and analysis and sends out a control command to control the feeding work of the feeding device. The photosensitive sensor module is used to detect the LED. Whether the light is on, and then detect whether the nozzle monitoring circuit is conducting. When the photosensitive sensor module senses that the LED light is shining, the CPU control unit judges that the nozzle monitoring circuit is conducting, and concludes that an expanded conductive pattern has been formed at the front edge of the nozzle of the nozzle. The conclusion of the droplet is that a fault occurs when the nozzle is discharged. At this time, the CPU control unit sends a control signal to control the feeding device, so that the conductive droplet formed at the front edge of the nozzle of the nozzle disappears, and the faulty working state of the 3D printer is eliminated. , to make the 3D printing work properly.

As a preferred technical solution of the present invention, the LED lamp is arranged in the sensing working circuit as a photoelectric element.

As another preferred technical solution of the present invention, the LED lamp is arranged in the ground circuit as a photoelectric element.

As a further preferred technical solution of the above solution, the photosensitive sensor module is arranged in a non-contact manner close to the LED lamp, and the sensing end of the photosensitive sensor module faces the light emitting direction of the LED lamp.

As a further preferred technical solution of the above solution, an adjustment device is provided, and the adjustment device is respectively connected to the CPU control unit and the feeding device for signals. material work.

As a further preferred technical solution of the above solution, the CPU control unit adopts an STM32 single-chip microcomputer.

As a further preferred technical solution of the above solution, the feeding device adopts pneumatic extrusion, hydraulic extrusion or motor extrusion, and drives the extrusion device to feed.

As a further preferred technical solution of the above solution, at the position of the nozzle front of the nozzle of the 3D printer, the two open-circuit ends of the ground circuit and the sensing working circuit are arranged face to face around the nozzle front of the nozzle at an interval of 180°, and the ground circuit The distance between the two open-circuit ends and the sensing working circuit is greater than the inner diameter of the nozzle of the shower head, so that the grounding terminal circuit and the two open-circuit ends of the sensing working circuit do not constitute obstacles to the normal discharge of the nozzle.

Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages:

1. The present invention provides a 3D printing nozzle construction method for intelligent monitoring of the printing form of hydrogel materials. Through the real-time monitoring of the nozzle discharge process, compared with the traditional human eye monitoring, the accuracy is higher;

2. The present invention uses electrical signals as control and adjustment signals, which is faster and more real-time than traditional manual adjustment methods;

3. The present invention proposes a 3D printing nozzle construction method for intelligent monitoring of the printing form of hydrogel materials, which adopts a modular design, which is easy to integrate and easy to use;

4. Aiming at the requirement of improving the printing quality in the 3D printing process of hydrogel materials, the present invention proposes a 3D printing nozzle construction method that intelligently monitors the discharge situation and regulates it in real time, and monitors the printing process in real time through the nozzle monitoring circuit. The fault sends a signal to the CPU unit to adjust in time, thereby improving the printing quality and printing out products that meet the intended purpose.

Description of drawings

FIG. 1 is a schematic structural diagram of an intelligent monitoring system for 3D printing of conductive gel materials according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a material supply failure state in which the nozzle monitoring circuit is in a circuit conduction state according to Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram of logic control of a method for intelligently monitoring the working status of a 3D printing nozzle according to an embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention are described in detail as follows:

Embodiment one:

In this embodiment, referring to FIGS. 1 to 3, an intelligent monitoring system for 3D printing of conductive gel materials mainly includes a CPU control unit 1, a feeding device 3 of a 3D printer, a nozzle 11, and a power supply terminal 10. The CPU controls Unit 1 adopts STM32 single-chip microcomputer, the discharge port of feeding device 3 is connected with the tube cavity inlet of nozzle 11, CPU control unit 1 controls the feeding work of feeding device 3, and feeding device 3 performs discharging work through nozzle 11, The power supply terminal 10 supplies power to each electronic device. The intelligent monitoring system also includes a sensing device. The sensing device transmits the collected discharge status information of the nozzle 11 to the CPU control unit 1. The sensing device is mainly composed of the nozzle monitoring circuit 4, The LED lamp 9, the photosensitive sensor module 5 and the power supply terminal 10 are composed, and the nozzle monitoring circuit 4 is composed of two parts, the ground terminal circuit 6 and the sensor working circuit 7, wherein one end of the ground terminal circuit 6 is connected to the ground terminal 8, and the ground terminal circuit The other end of 6 is set at the nozzle position of the nozzle 11 of the 3D printer to form a first open circuit end, and one end of the sensing working circuit 7 is electrically connected to the power supply terminal 10, and the other end of the sensing working circuit 7 is arranged at the nozzle of the 3D printer. The nozzle position of 11 forms a second open circuit end, and the LED lamp 9 is arranged in the nozzle monitoring circuit 4 as a photoelectric element, and the two open circuit ends of the ground terminal circuit 6 and the sensing working circuit 7 are arranged on the 3D printer in a non-contact form. At the position of the nozzle of the nozzle of the nozzle 11, a circuit break is formed between the two open ends of the ground terminal circuit 6 and the sensing working circuit 7, if and only when the nozzle front position of the nozzle of the nozzle 11 of the 3D printer forms an expansion When the conductive droplet 12 of the ground terminal circuit 6 and the two open-circuit ends of the sensing working circuit 7 are infiltrated with the conductive droplet 12 at the same time, the two open-circuit ends of the grounding terminal circuit 6 and the sensing working circuit 7 are An electrical connection occurs, and then the nozzle monitoring circuit 4 forms a conductive path between the ground terminal 8 and the power supply terminal 10, so that the nozzle monitoring circuit 4 forms a circuit closed conductive working circuit, and the LED lamp 9 emits light at this time; the photosensitive sensor module 5 and LED lamp 9 is installed together, and the signal output end of photosensitive sensor module 5 is connected with the corresponding signal end of CPU control unit 1, and photosensitive sensor module 5 sends real-time signal to CPU control unit 1, and CPU control unit 1 draws by calculation and analysis As a result, a control command is issued to control the feeding work of the feeding device 3. The photosensitive sensor module 5 is used to detect whether the LED lamp 9 emits light, and then detects and judges whether the nozzle monitoring circuit 4 is turned on. When the photosensitive sensor module 5 senses the LED light When the lamp 9 lights up, the CPU control unit 1 judges that the nozzle monitoring circuit 4 is conducting, and draws the conclusion that the expanded conductive liquid droplet 12 has been formed at the front position of the nozzle of the nozzle 11, and recognizes that the nozzle 11 fails when discharging, At this time, the CPU control unit 1 sends a control signal to control the feeding device 3, so that the conductive liquid droplet 12 formed at the front edge of the nozzle of the nozzle 11 disappears, and the faulty working state of the 3D printer is eliminated, so that the 3D printing works normally.

In this embodiment, referring to FIG. 1 and FIG. 2 , the LED lamp 9 is arranged in the sensing working circuit 7 as a photoelectric element, so that the LED lamp 9 is arranged between the power supply terminal 10 and the second open circuit terminal. The photosensitive sensor module 5 is disposed close to the LED lamp 9 in a non-contact manner, and the sensing end of the photosensitive sensor module 5 faces the light emitting direction of the LED lamp 9 . An adjustment device 2 is provided, and the adjustment device 2 is respectively connected with the CPU control unit 1 and the feeding device 3. The CPU control unit 1 controls the driving control of the feeding device 3 by controlling the adjustment device 2, and then controls the discharge work of the nozzle 11. . The feeding device 3 adopts pneumatic extrusion, hydraulic extrusion or motor extrusion, and drives the extrusion device to feed.

In this embodiment, referring to FIG. 1 and FIG. 2 , at the position of the nozzle front edge of the nozzle 11 of the 3D printer, the two open ends of the ground terminal circuit 6 and the sensing working circuit 7 face to face around the nozzle front edge of the nozzle 11 at an angle of 180°. The angle interval is set, the distance between the two open ends of the ground terminal circuit 6 and the sensing working circuit 7 is greater than the inner diameter of the nozzle of the shower head 11, so that the two open circuits of the ground terminal circuit 6 and the sensing working circuit 7 do not constitute a barrier to the normal nozzle. Obstacles to discharge.

In this embodiment, referring to FIGS. 1-3 , the photosensitive sensor module 5 and the LED lamp 9 are installed together to detect whether the circuit is conducting. The photosensitive sensor module 5 is connected to the CPU control unit 1 as an input, and transmits the detected information to the CPU control unit 1 . The CPU control unit 1 is connected with the adjustment device 2 , and controls the adjustment device 2 according to the signal collected from the photosensitive sensor module 5 . The control adjustment device 2 is connected with the feeding device 3 to adjust the feeding device, and the feeding device 3 is connected with the nozzle 11 to control the discharge situation.

In this embodiment, referring to Figs. 1-3, using the intelligent monitoring system for 3D printing of conductive gel materials in this embodiment, the method for intelligently monitoring the working status of the nozzles of 3D printing is carried out at the front position of the nozzles of the nozzles 11 of the 3D printer A nozzle monitoring circuit 4 with a gap is arranged at the nozzle, and the notched ends of the nozzle monitoring circuit 4 are respectively connected to the nozzles of the 3D printing head. 4. Connect the LED light-emitting device and set the photosensitive sensor device. The photosensitive sensor device detects the light-emitting state signal of the LED light-emitting device in real time, and sends the acquisition signal to the main controller STM32 single-chip computer; the STM32 single-chip computer performs calculation and signal processing according to the received signal. Control the feeding device 3 of the 3D printer, and adjust the discharge state of the nozzle 11 of the 3D printer; when the photosensitive sensor senses that the LED light-emitting device emits light, the STM32 single-chip computer judges that the nozzle monitoring circuit 4 is turned on, and obtains that the nozzle in the nozzle 11 The conclusion that the expanded conductive liquid droplet 12 has been formed at the front position indicates that there is an abnormal state of failure when the nozzle 11 is discharging. At this time, the STM32 microcontroller sends a control signal to control the feeding device 3, so that a The expanded conductive liquid droplet 12 disappears, and the faulty working state of the 3D printer is eliminated, so that the 3D printing works normally.

In this embodiment, referring to Figures 1 to 3, the method for intelligently monitoring the working status of the 3D printing nozzle in this embodiment is used to prepare a model, including the following steps:

a. Use the STM32 single-chip microcomputer as the CPU control unit 1, use the air pressure extrusion as the feeding device 3, use the syringe as the nozzle 11, connect and seal the air outlet of the feeding device 3 with the inlet of the syringe, and fix the two wires respectively On both sides of the syringe nozzle, as shown in Figure 1 and Figure 2, the part beyond the syringe nozzle is stripped of the outer sheath of the wire to form two non-contact contacts, one of which is grounded, and the other is connected to the LED lamp 9 to form The nozzle monitoring circuit 4 and the LED light 9 are connected to the power supply terminal 10 of the CPU control unit 1, and the photosensitive sensor module 5 is set to the working mode, and put together with the LED light 9, and the adjustment device 2 is composed of an air pressure adjustment knob and a stepping motor;

b. Weigh 0.4g of sodium alginate NaAlg, mix it with 9.6g of deionized water, stir at room temperature for 10 minutes until completely dissolved, and form hydrogel A;

c. Packing the hydrogel A prepared in step b into the syringe used in step a;

d. Install the syringe on the desktop 3D printer, and import the model information to be printed into the 3D printer;

e. Start printing. After the 3D printer works normally, manually reduce the air pressure. At this time, there is a failure in the discharge, and the speed is very slow. Expanded conductive liquid droplets 12 appear at the nozzle and touch the two contacts in the wire loop. The nozzle monitoring circuit 4 is turned on, the LED light 9 is lit, the photosensitive sensor module 5 detects the light-emitting signal of the LED light 9, the CPU control unit 1 sends out a signal, controls the adjustment device 2, increases the air pressure, the conductive liquid droplet 12 disappears, and prints Proceed as normal, printing out the expected model.

In this embodiment, aiming at the requirement of improving the printing quality in the 3D printing process of hydrogel materials, a 3D printing nozzle construction method is adopted to intelligently monitor the discharge situation and real-time control. The system includes a nozzle monitoring circuit 4 , a CPU control unit 1 , a photosensitive sensor module 5 , an adjustment device 2 , and a feeding device 3 . The printing process is monitored in real time through the nozzle monitoring circuit 4, and if a fault occurs, a signal is sent to the CPU unit 1 to adjust in time, thereby improving the printing quality and printing out products that meet the predetermined requirements.

Embodiment two:

This embodiment is basically the same as Embodiment 1, especially in that:

In this embodiment, the LED lamp 9 is disposed in the ground terminal circuit 6 as a photoelectric element, so that the LED lamp 9 is disposed between the ground terminal 8 and the first open-circuit terminal. When the expanding conductive liquid droplet 12 appears at the nozzle, it touches the two contacts in the wire loop, so that the first open circuit end and the second open circuit end are electrically connected, the nozzle monitoring circuit 4 is turned on, and the LED lamp 9 is lit. The photosensitive sensor module 5 detects the light-emitting signal of the LED lamp 9, the CPU control unit 1 sends a signal, controls the adjustment device 2, increases the air pressure, the conductive liquid droplet 12 disappears, and the printing proceeds normally, and the expected model is printed out. In this embodiment, the printing process is monitored in real time through the nozzle monitoring circuit 4, and if a fault occurs, a signal is sent to the CPU unit 1 for timely adjustment, thereby improving the printing quality and printing out products that meet the predetermined requirements.

Embodiment three:

This embodiment is basically the same as the previous embodiment, and the special features are:

In this embodiment, the feeding device 3 adopts a hydraulic extrusion method to drive the extrusion device to supply materials. The hydraulic extrusion method is adopted, the device structure has strong bearing capacity, and the extrusion force is large. The printed accumulation layer manufactured by 3D printing High density.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and various changes can also be made according to the purpose of the invention of the present invention. The changes, modifications, substitutions, combinations or simplifications should be equivalent replacement methods, as long as they meet the purpose of the present invention, as long as they do not deviate from the technical principle of the method, application and device for intelligently monitoring the working status of 3D printing nozzles of the present invention and inventive concepts all belong to the protection scope of the present invention.

Claims (10)

1. A method for intelligently monitoring the working state of the nozzle of 3D printing, characterized in that: a nozzle monitoring circuit with a gap is set at the nozzle front position of the nozzle of the 3D printer, and the gap of the nozzle monitoring circuit does not constitute a barrier to the normal exit of the nozzle. Connect the LED light-emitting device in the nozzle monitoring circuit, and set up a photosensitive sensor device. The photosensitive sensor device detects the light-emitting status signal of the LED light-emitting device in real time, and sends an acquisition signal to the main controller; One end of the grounding end circuit and the sensing working circuit are respectively arranged at the front of the nozzle to form a first open circuit end and a second open circuit end, the other end of the grounding end circuit is connected to the ground end, and the sensing working circuit is another One end is connected to the LED light-emitting device; the main controller performs calculation and signal processing according to the received signal, and adjusts the discharge state of the nozzle of the 3D printer by controlling the feeding device of the 3D printer; when the photosensitive sensor detects that the LED light-emitting device emits light, The main controller judges the conduction of the nozzle monitoring circuit, and draws the conclusion that the expanded conductive liquid droplets have formed at the front of the nozzle of the nozzle, and recognizes that there is an abnormal state of failure when the nozzle is discharging, and the main controller sends a control signal at this time Control the feeding device so that the expanded conductive droplets formed at the front of the nozzle of the nozzle disappear, eliminate the faulty working state of the 3D printer, and make the 3D printing work normally. 2. An application of the method for intelligently monitoring the working state of the nozzle of 3D printing according to claim 1, characterized in that: intelligent monitoring is carried out for the 3D printing of hydrogel materials. 3. An intelligent monitoring device for 3D printing of conductive gel materials, mainly comprising a feeding device (3) and a nozzle (11) of a CPU control unit (1), a 3D printer and a power supply terminal (10), a feeding device ( 3) The discharge port of the nozzle is connected with the lumen inlet of the nozzle (11), and the CPU control unit (1) controls the feeding work of the feeding device (3), and the feeding device (3) is carried out through the nozzle (11) For discharging work, the power supply terminal (10) supplies power to each electronic device, and it is characterized in that: the intelligent monitoring system also includes a sensing device, and the sensing device collects the discharging state of the nozzle (11) The information is transmitted to the CPU control unit (1), the sensing device is mainly composed of a nozzle monitoring circuit (4), an LED light (9), a photosensitive sensor module (5) and the power supply terminal (10), and the nozzle The monitoring circuit (4) consists of two parts, a grounding terminal circuit (6) and a sensing working circuit (7), wherein one end of the grounding terminal circuit (6) is connected to the grounding terminal (8), and the grounding terminal circuit (6) ) is set at the nozzle position of the nozzle (11) of the 3D printer to form a first open-circuit end, and one end of the sensing working circuit (7) is electrically connected to the power supply end (10), and the sensing The other end of the working circuit (7) is arranged at the nozzle position of the nozzle (11) of the 3D printer to form a second open circuit end, and the LED lamp (9) is arranged in the nozzle monitoring circuit (4) as a photoelectric element, so The two open ends of the ground terminal circuit (6) and the sensor working circuit (7) are arranged at the nozzle position of the nozzle (11) of the 3D printer in a non-contact form, and the ground terminal circuit (6) and the sensor A loop gap in which the circuit is disconnected is formed between the two open ends of the sensing working circuit (7), if and only when an expanding conductive droplet (12) is formed at the nozzle front position of the nozzle (11) of the 3D printer, and When the two open-circuit ends of the ground terminal circuit (6) and the sensing working circuit (7) are infiltrated with the conductive droplet (12) at the same time, the ground terminal circuit (6) and the sensing working circuit (7) ) is electrically connected to the two open ends, so that the nozzle monitoring circuit (4) forms a conductive path between the ground terminal (8) and the power supply terminal (10), so that the nozzle monitoring circuit (4) forms a circuit closed conductive working circuit , at this moment, the LED lamp (9) then emits light; the photosensitive sensor module (5) and the LED lamp (9) are installed together, and the signal output terminal of the photosensitive sensor module (5) is connected with the CPU control unit (1) The corresponding signal terminal is connected, and the photosensitive sensor module (5) sends a real-time signal to the CPU control unit (1), and the CPU control unit (1) obtains a result and sends a control command through calculation and analysis, and controls all The feeding work of the feeding device (3) is controlled, and the photosensitive sensor module (5) is used to detect whether the LED lamp (9) emits light, and then detect and judge whether the nozzle monitoring circuit (4) is conducting. The photosensitive sensor module (5) senses that the LED light (9) emits When the light is turned on, the CPU control unit (1) judges that the nozzle monitoring circuit (4) is conducting, and draws the conclusion that an expanded conductive droplet (12) has been formed at the nozzle front position of the nozzle (11), and identifies A failure occurs when the nozzle (11) is discharging, and at this time, the CPU control unit (1) sends a control signal to control the feeding device (3), so that the conductive droplets formed at the nozzle front position of the nozzle (11) ( 12) disappear, eliminate the faulty working state of the 3D printer, and make the 3D printing work normally. 4. The intelligent monitoring device for 3D printing of conductive gel materials according to claim 3, characterized in that: the LED lamp (9) is set in the sensing working circuit (7) as a photoelectric element. 5. The intelligent monitoring device for 3D printing of conductive gel material according to claim 3, characterized in that: the LED lamp (9) is set in the ground terminal circuit (6) as a photoelectric element. 6. The intelligent monitoring device for 3D printing of conductive gel materials according to any one of claims 3 to 5, characterized in that: the photosensitive sensor module (5) is arranged in a non-contact form close to the LED lamp ( 9) Setting and making the sensing end of the photosensitive sensor module (5) face the light emitting direction of the LED lamp (9). 7. The intelligent monitoring device for 3D printing of conductive gel materials according to any one of claims 3 to 5, characterized in that: an adjustment device (2) is provided, and the adjustment device (2) is connected with the CPU control unit respectively (1) is connected with the signal of the feeding device (3), and the CPU control unit (1) controls the driving control of the feeding device (3) by controlling the regulating device (2), and then controls the nozzle (11) The output work. 8. The intelligent monitoring device for 3D printing of conductive gel materials according to any one of claims 3-5, characterized in that: the CPU control unit (1) adopts STM32 single-chip microcomputer. 9. The intelligent monitoring device for 3D printing of conductive gel materials according to any one of claims 3 to 5, characterized in that: the feeding device (3) adopts pneumatic extrusion, hydraulic extrusion or motor extrusion way, to drive the extruder to feed. 10. According to the intelligent monitoring device for 3D printing of conductive gel materials according to any one of claims 3 to 5, it is characterized in that: at the nozzle front position of the nozzle (11) of the 3D printer, the ground terminal circuit ( 6) and the two open-circuit ends of the sensing working circuit (7) are arranged face-to-face around the front edge of the nozzle of the shower head (11) according to an angle interval of 180°, and the two ends of the grounding terminal circuit (6) and the sensing working circuit (7) The distance between the open ends is larger than the inner diameter of the nozzle of the shower head (11), so that the two open ends of the grounding circuit (6) and the sensing working circuit (7) do not constitute an obstacle blocking the normal discharge of the nozzle.