A 3D printing device and its control circuit

Abstract

The present invention discloses a 3D printing device and its control circuit. Among them, the control circuit includes a glue filling driving module, a curing module, a heating driving module, an extrusion driving module, a motor driving module and a control module. During printing, first, the extrusion driving module controls the extrusion module to extrude linear consumables to print the periphery of the product and form it. Then, the glue filling driving module makes the glue filling module act to fill liquid consumables in the periphery of the product, and is cured by the curing module, realizing the printing of two materials. And by adding a glue filling and its driving module, the printing of products with a flat and bright effect is realized. Moreover, by using glue filling instead of the extrusion wire feeding printing method, the working efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a 3D printing device and its control circuit. Background Art

[0002] 3D printing (3DP) is a kind of rapid prototyping technology. It is a technology that constructs objects by layer-by-layer printing based on digital model files, using powdered metals or plastic and other bondable materials. 3D printing is usually realized by digital technology material printers. There are many different 3D printing technologies, and their differences lie in the way of available materials and the creation of components by different layer structures. Commonly used materials for 3D printing include nylon fiberglass, durable nylon materials, gypsum materials, aluminum materials, titanium alloys, stainless steel, silver plating, gold plating, glue-like materials, etc.

[0003] However, existing 3D printing devices can only print one kind of material (such as PLA material, which is a biodegradable material). During printing, it prints little by little through an extrusion method. However, when printing products with planar and shiny effects such as LOGOs and advertising texts, such 3D printers cannot meet the requirements of planar and shiny effects, and the way of extruding filaments little by little has very low efficiency.

[0004] Therefore, the existing technology still needs to be improved. Summary of the Invention

[0005] In view of the deficiencies of the above-mentioned existing technology, the purpose of the present invention is to provide a 3D printing device and its control circuit, which can realize the control of two printing methods: extrusion and glue injection.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A control circuit of a 3D printing device, comprising:

[0008] An extrusion driving module for driving an extrusion module to extrude linear consumables;

[0009] A glue injection driving module for driving the operation of a glue injection module;

[0010] A curing module for curing the liquid consumables output by the glue injection module;

[0011] A heating driving module for driving a heating component to heat;

[0012] A motor driving module for driving the operation state of a motor of a printing module;

[0013] A control module for controlling the working states of the glue injection driving module, the curing module, the heating driving module, the extrusion driving module, and the motor driving module;

[0014] The glue filling driving module, curing module, heating driving module, extrusion driving module, and motor driving module are all connected to the control module.

[0015] As an improvement of the present invention, the glue filling driving module includes an automatic glue filling driving unit and a manual glue filling driving unit, and the automatic glue filling driving unit and the manual glue filling driving unit are connected to the control module.

[0016] As an improvement of the present invention, the automatic glue filling driving unit includes an isolation sub-unit and a switch sub-unit, and the control module is connected to the glue filling module through the isolation sub-unit and the switch sub-unit in sequence.

[0017] As an improvement of the present invention, the curing module includes a first UV driving unit, a second UV driving unit, and a selection unit for selecting the first UV driving unit or the second UV driving unit to work. The first UV driving unit and the second UV driving unit are connected to the selection unit, and the selection unit is connected to the control module.

[0018] As a further improvement of the present invention, the motor driving module includes an open-loop stepping motor driving unit, and the open-loop stepping motor driving unit is connected to the stepping motor of the extrusion driving module and the control module.

[0019] As a further improvement of the present invention, the motor driving module further includes a closed-loop stepping motor driving unit, and the closed-loop stepping motor driving unit is connected to the stepping motor for controlling the movement of the printing module and the control module.

[0020] As a further improvement of the present invention, the control module includes a single-chip microcomputer. The isolation sub-unit includes a first optocoupler chip, a first resistor, a second resistor, a third resistor, and a first capacitor. The first pin of the first optocoupler chip is connected to the 3.3V power supply terminal through the first resistor. The second pin of the first optocoupler chip is connected to the RTS1 pin of the single-chip microcomputer, is also connected to the manual glue filling driving unit through the second resistor, and is also grounded through the first capacitor. The fourth pin of the first optocoupler chip is connected to the switch sub-unit through the third resistor.

[0021] As a further improvement of the present invention, the switch sub-unit includes a first triode, a first MOS tube, a fourth resistor, a fifth resistor, and a first diode. The base of the first triode is connected to one end of the third resistor. The emitter of the first triode is connected to the gate of the first MOS tube and one end of the fifth resistor through the fourth resistor. The source of the first MOS tube is connected to the other end of the fifth resistor and the glue filling module. The drain of the first MOS tube is connected to the negative pole of the first diode and the 24V power supply terminal, and the positive pole of the first diode is grounded.

[0022] As a further improvement of the present invention, the closed-loop stepper motor driving unit includes a magnetic induction encoding sub-unit, a closed-loop driving sub-unit and a closed-loop control sub-unit. The magnetic induction encoding sub-unit and the closed-loop driving sub-unit are connected to the closed-loop control sub-unit. The magnetic induction encoding sub-unit senses the rotation angle of the stepper motor and feeds it back to the closed-loop control sub-unit. The closed-loop control sub-unit controls the rotation state of the stepper motor by driving the closed-loop driving sub-unit according to the angle signal fed back by the magnetic induction encoding sub-unit.

[0023] The present invention also provides a 3D printing device, which includes a main board, a motor driving board and a control circuit. The glue injection driving module, the curing module, the heating driving module, the extrusion driving module and the control module of the control circuit are arranged on the main board, and the motor driving module is arranged on the motor driving board.

[0024] Compared with the prior art, for the 3D printing device and its control circuit provided by the present invention, the control circuit includes a glue injection driving module, a curing module, a heating driving module, an extrusion driving module, a motor driving module and a control module. During printing, first, the extrusion driving module controls the extrusion module to extrude linear consumables to print the periphery of the product and form it. Then, the glue injection driving module makes the glue injection module act to inject liquid consumables into the periphery of the product, and the curing module cures it, realizing the printing of two materials. Moreover, by adding a glue injection and its driving module, the printing of products with a flat and bright effect is realized. And by using glue injection instead of the extrusion wire feeding printing method, the working efficiency is greatly improved. Description of the Drawings

[0025] Figure 1 It is a structural block diagram of the control circuit of the 3D printing device provided by the present invention.

[0026] Figure 2 It is a circuit schematic diagram of the glue injection driving module in the control circuit of the 3D printing device provided by the present invention.

[0027] Figure 3 It is a circuit schematic diagram of the main control module in the control circuit of the 3D printing device provided by the present invention.

[0028] Figure 4 It is a circuit schematic diagram of the curing module in the control circuit of the 3D printing device provided by the present invention.

[0029] Figure 5 It is a circuit schematic diagram of the open-loop motor driving unit in the control circuit of the 3D printing device provided by the present invention.

[0030] Figure 6 It is a structural block diagram of the closed-loop motor driving unit in the control circuit of the 3D printing device provided by the present invention.

[0031] Figure 7Schematic diagram of the control subunit of the closed-loop motor drive unit in the control circuit of the 3D printing device provided by the present invention.

[0032] Figure 8 Schematic diagram of the drive subunit of the closed-loop motor drive unit in the control circuit of the 3D printing device provided by the present invention.

[0033] Figure 9 Schematic diagram of the isolation transmission subunit of the closed-loop motor drive unit in the control circuit of the 3D printing device provided by the present invention.

[0034] Figure 10 Schematic diagram of a heating unit in the control circuit of the 3D printing device provided by the present invention.

[0035] Figure 11 Schematic diagram of a fan drive unit in the control circuit of the 3D printing device provided by the present invention.

[0036] Figure 12 Schematic diagram of the storage module in the control circuit of the 3D printing device provided by the present invention.

[0037] Figure 13 Schematic diagram of the USB communication unit in the control circuit of the 3D printing device provided by the present invention.

[0038] Figure 14 Schematic diagram of the Ethernet communication unit in the control circuit of the 3D printing device provided by the present invention.

[0039] Figure 15 Schematic diagram of the WIFI communication unit in the control circuit of the 3D printing device provided by the present invention.

[0040] Figure 16 Schematic diagram of the power module of the 3D printing device provided by the present invention. Detailed implementation manners

[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] It should be noted that when a component is referred to as being "installed on", "fixed to" or "disposed on" another component, it can be directly on the other component or there may be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0043] It should also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present invention are only relative to each other or with reference to the normal use state of the product, and should not be considered restrictive.

[0044] Please refer to Figure 1 , the control circuit of the 3D printing device provided by the present invention includes a glue filling driving module 1, a curing module 2, a heating driving module 3, an extrusion driving module 4, a motor driving module 5, and a control module 6. The glue filling driving module 1, the curing module 2, the heating driving module 3, the extrusion driving module 4, the fan driving module 9, and the motor driving module 5 are all connected to the control module 6.

[0045] Among them, the extrusion driving module 4 is used to drive the extrusion module to extrude linear consumables, the glue filling driving module 1 is used to drive the action of the glue filling module, that is, to drive the glue filling pneumatic solenoid valve to start, so that the glue filling module starts to fill glue. The curing module 2 is used to cure the liquid consumables output by the glue filling module, the heating driving module 3 is used to drive the heating component to heat, the fan driving module 9 is used to drive the working state of the fan, and the motor driving module 5 is used to drive the action state of the motor of the printing module, that is, to control the printing position of the printing module. The control module 6 is used to control the working states of the glue filling driving module 1, the curing module 2, the heating driving module 3, the extrusion driving module 4, the fan driving module 9, and the motor driving module 5.

[0046] During printing, first, the extrusion driving module 4 controls the extrusion module to extrude linear consumables (such as PLA linear consumables) to print and form the periphery of the product. Then, the glue filling driving module 1 makes the glue filling module act to fill liquid consumables (such as liquid acrylic) in the periphery of the product, and the curing module 2 cures it, realizing the printing of two materials. And by adding a glue filling and its driving module, the printing of products with a flat and bright effect is realized. Moreover, by using glue filling instead of the extrusion wire feeding printing method, the working efficiency is greatly improved.

[0047] Preferably, the glue filling driving module 1, the extrusion driving module 4, the curing module 2, the heating driving module 3, the fan driving module 9, and the control module 6 are arranged on the main board, and the motor driving module 5 is arranged on the motor driving board. The separate arrangement of the main board and the motor driving board is beneficial to the maintenance and repair of the equipment.

[0048] Please refer to together Figure 2 and Figure 3, the glue injection driving module 1 includes an automatic glue injection driving unit 11 and a manual glue injection driving unit 12. The automatic glue injection driving unit 11 and the manual glue injection driving unit 12 are connected to the control module 6. The present invention uses an automatic glue injection method for 3D printing work. When the automatic glue injection driving unit 11 malfunctions, the present invention can also continue to complete the glue injection by using the manual glue injection driving unit 12 in a manual glue injection manner, thereby avoiding waste products when a part of the product is printed and the printing device suddenly malfunctions.

[0049] Preferably, the automatic glue injection driving unit 11 includes an isolation sub-unit 111 and a switch sub-unit 112. The control module 6 is connected to the glue injection module through the isolation sub-unit 111 and the switch sub-unit 112 in sequence. The isolation sub-unit 111 uses an optical transmission method, has strong anti-interference ability, and will not cause misjudgment and incorrect operation of the glue injection machine.

[0050] In this embodiment, the control module 6 includes a single-chip microcomputer U1. The isolation sub-unit 111 includes a first optocoupler chip U2, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1. The first pin of the first optocoupler chip U2 is connected to the 3.3V power supply terminal through the first resistor R1. The second pin of the first optocoupler chip U2 is connected to the RTS1 pin of the single-chip microcomputer U1, is also connected to the manual glue injection driving unit 12 through the second resistor R2, and is also grounded through the first capacitor C1. The fourth pin of the first optocoupler chip U2 is connected to the switch sub-unit 112 through the third resistor R3.

[0051] The switch sub-unit 112 includes a first triode Q1, a first MOS transistor Q2, a fourth resistor R4, a fifth resistor R5, and a first diode D1. The base of the first triode Q1 is connected to one end of the third resistor R3. The emitter of the first triode Q1 is connected to the gate of the first MOS transistor Q2 and one end of the fifth resistor R5 through the fourth resistor R4. The source of the first MOS transistor Q2 is connected to the other end of the fifth resistor R5 and the glue injection module. The drain of the first MOS transistor Q2 is connected to the negative pole of the first diode D1 and the 24V power supply terminal, and the positive pole of the first diode D1 is grounded.

[0052] The control signal output by the single-chip microcomputer U1 is coupled and output through the first optocoupler chip U2 to drive the first triode Q1 and the first MOS transistor Q2 to conduct, so that the glue injection pneumatic solenoid valve connected to the first MOS transistor Q2 is opened. The present invention uses an optocoupler chip transmission method to improve the anti-interference performance of the automatic glue injection driving unit 11.

[0053] Please refer to Figure 4, the curing module 2 includes a first UV driving unit 21, a second UV driving unit 22 and a selection unit 23. The first UV driving unit 21 and the second UV driving unit 22 are connected to the selection unit 23, and the selection unit 23 is connected to the control module 6. The selection unit 23 selects either the first UV driving unit 21 or the second UV driving unit 22 to drive the UV lamp to emit light to complete the curing work.

[0054] The first UV driving unit 21 includes a second optocoupler chip U3, a second triode Q3, a second MOS tube Q4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R8 and a fuse F1. The second pin of the second optocoupler chip U3 is connected to the PE1 pin of the single-chip microcomputer U1. The fourth pin of the second optocoupler chip U3 is connected to the base of the second triode Q3 and one end of the seventh resistor R7 through the sixth resistor R6. The other end of the seventh resistor R7 is connected to the emitter of the second triode Q3. The collector of the second triode Q3 is grounded through the eighth resistor R8 and is also connected to the gate of the second MOS tube Q4 through the ninth resistor R8. The drain of the second MOS tube Q4 is connected to the second UV driving unit 22 and is also connected to the UV lamp strip and the potting power valve interface J1 through the fuse F1.

[0055] The second UV driving unit 22 includes a third triode Q5, a tenth resistor R10, an eleventh resistor R11, a second diode D2, a relay JQ1 and a second diode D2. The base of the third triode Q5 is connected to the PE1 pin of the single-chip microcomputer U1 through the tenth resistor R10. The emitter of the third triode Q5 is connected to the second pin of the relay JQ1 and the positive pole of the second diode D2 through the eleventh resistor R11. The first pin of the relay JQ1 and the negative pole of the second diode D2 are connected to the 5V power supply terminal. The fourth pin of the relay JQ1 is connected to the drain of the second MOS tube Q4.

[0056] The selection unit 23 selects one of the UV driving units to work by inserting a shorting plug on the SIP3 interface. Since the relay JQ1 has a limited lifespan, the present invention preferentially selects the first UV driving unit 21 to work. When the first UV driving unit 21 malfunctions, the second UV driving unit 22 with lower cost is selected to work.

[0057] Please refer to Figure 5 , for the control circuit of the 3D printing device of the present invention, the motor driving module 5 includes an open-loop stepper motor driving unit. There are two open-loop stepper motor driving units, which can extrude consumables of two colors (such as PLA material). The open-loop control has the characteristics of fewer electronic components used and lower cost. The driving subunit can adopt a driving chip of model TMC2660 and its peripheral electronic devices. Since it is prior art, no detailed description is given here.

[0058] Please refer to Figure 6 Optionally, the motor drive module 5 may further include a closed-loop stepper motor drive unit, and the closed-loop stepper motor drive unit is connected to the stepper motor and the control module 6 that control the movement of the printing module.

[0059] Please refer to Figure 7 and Figure 8 The closed-loop stepper motor drive unit includes a magnetic induction encoding subunit 51, a closed-loop drive subunit 52, and a closed-loop control subunit 53. The magnetic induction encoding subunit 51 and the closed-loop drive subunit 52 are connected to the closed-loop control subunit 53. The magnetic induction encoding subunit 51 senses the rotation angle of the stepper motor and feeds it back to the closed-loop control subunit 53. The closed-loop control subunit 53 controls the rotation state of the stepper motor by driving the closed-loop drive subunit 52 according to the angle signal fed back by the magnetic induction encoding subunit 51. The present invention uses a stepper motor and a feedback method to replace the existing open-loop stepper motor. On the premise of increasing a relatively low cost, the positioning accuracy of the printing module is improved. Moreover, the use of closed-loop feedback control can increase the rotation speed of the stepper motor, and the motor can work under overload.

[0060] Please continue to refer to Figure 6 and Figure 9 The closed-loop stepper motor drive unit of the 3D printing device of the present invention further includes an isolation transmission subunit 54 for sending the control signal of the closed-loop control subunit 53 to the main board of the 3D printing device. The isolation transmission subunit 54 is electrically connected to the closed-loop control subunit 53 and the main board of the 3D printing device, and is used to feed back the control signal of the closed-loop control subunit 53 to the main board of the 3D printing device, and send the control signal output by the main board of the 3D printing device to the closed-loop control subunit 53 to accurately control the rotation angle of the stepper motor.

[0061] The magnetic induction encoding subunit 51 includes an isolation transmission circuit 511 and a DIP switch control circuit 512. The isolation transmission circuit 511 and the DIP switch control circuit 512 are electrically connected to the closed-loop control subunit 53. Specifically, when implemented, a magnet is arranged radially on the stepper motor. When the stepper motor rotates, the magnetic field of the magnet will change. The isolation transmission circuit 511 is arranged on one side of the stepper motor, 1-3 mm away from the magnet, and is used to sense the magnetic field intensity of the magnet on the stepper motor, so as to obtain the rotation angle of the stepper motor and communicate with the closed-loop control subunit 53 to feedback the angle data in real time. The DIP switch control circuit 512 is used to set the working mode of the stepper motor.

[0062] Please continue to refer to Figure 7The closed-loop control subunit 53 includes a control chip U4, and the isolated transmission circuit 511 includes a magnetic encoding chip U5 and a second capacitor C2. The magnetic encoding chip U5 can be a magnetic sensor chip of model MT6816, and the second capacitor C2 is a filter capacitor. The control chip U4 can be an STM32F series chip.

[0063] The HVPP end of the magnetic encoding chip U5 is connected to the 3.3V power supply end and is also grounded through the second capacitor C2. The CSN end of the magnetic encoding chip U5 is connected to the PA4 end of the control chip U4. The CLK end, MISO end, and MOSI end of the magnetic encoding chip U5 are respectively connected to the PA5 end, PA6 end, and PA7 end of the control chip U4 (that is, the CLK end of the magnetic encoding chip U5 is connected to the PA5 end of the control chip U4, the MISO end of the magnetic encoding chip U5 is connected to the PA6 end of the control chip U4, and the MOSI end of the magnetic encoding chip U5 is connected to the PA7 end of the control chip U4). The magnetic encoding chip U5 is used to sense the magnetic field strength of the magnet, thereby obtaining the angle of the stepper motor and sending it to the control chip U4 through the SPI bus.

[0064] The dial control circuit 512 includes a four-position dial switch KW1, and the first, third, fifth and seventh pins of the four-position dial switch KW1 are respectively connected to the PA3 terminal, the PA2 terminal, the PA1 terminal and the PA0 terminal of the control chip U4. Among them, the first and second position switches (control signals are SET1 and SET2) are used to set the step size of the stepper motor, the third position switch (control signal is OPCL) is used to set the stepper motor to an open-loop or closed-loop state. The present invention preferably uses closed-loop feedback. If it is set to an open-loop state, it can be used for the drive control of the extrusion module. The fourth position switch (control signal is CAL) is used to set the speed of the stepper motor. The same stepper motor drive unit can reduce the wiring difficulty of the circuit board.

[0065] Please also read Figure 6 , Figure 7 , Figure 8 and Figure 9 The closed-loop driving sub-unit 52 includes a first motor driving sub-circuit 521 for driving the first coil of the stepper motor and a second motor driving sub-circuit 522 for driving the second coil of the stepper motor. One end of the first motor driving sub-circuit 521 and the second motor driving sub-circuit 522 are connected to the control module 6, and the other end of the first motor driving sub-circuit 521 and the second motor driving sub-circuit 522 are connected to the motor interface J2.

[0066] Among them, the first motor drive sub-circuit 521 includes a drive chip U6, a tenth resistor R10, an eleventh resistor R11, and a third capacitor C3. The LSS terminal of the drive chip U6 is grounded through the tenth resistor R10. The VREF terminal of the drive chip U6 is connected to the PB5 terminal of the control chip U4 through the eleventh resistor R11 and is also grounded through the third capacitor C3. The IN1 terminal and IN2 terminal of the drive chip U6 are respectively connected to the PB6 terminal and PB7 terminal of the control chip U4. The OUT1 terminal and OUT2 terminal of the drive chip U6 are connected to the 3rd pin and 4th pin of the motor interface J2.

[0067] The drive chip U6 can adopt a motor drive chip U6 with the model A4950. The control chip U4 outputs a PWM signal with a corresponding duty cycle to the drive chip U6, so that the drive chip U6 outputs a corresponding drive current to make the stepping motor rotate. Since the stepping motor includes two coils, two drive units are adopted in the present invention to drive one coil to act respectively. Since the circuit structure and working principle of the second motor drive sub-circuit 522 are the same as those of the first motor drive sub-circuit 521, the circuit composition and working principle of the second motor drive sub-circuit 522 will not be described in detail here.

[0068] The isolation transmission sub-unit 54 includes a first optocoupler isolation sub-circuit 541 and a second optocoupler isolation sub-circuit 542. One end of the first optocoupler isolation sub-circuit 541 and the second optocoupler isolation sub-circuit 542 is connected to the closed-loop control sub-unit 53, and the other end is connected to the communication interface J3, mainly playing the role of isolation and signal transmission.

[0069] In this embodiment, the first optocoupler isolation sub-circuit 541 includes a third optocoupler chip U7, a twelfth resistor R12, and a thirteenth resistor R13. The 3rd pin of the third optocoupler chip U7 is connected to the PB2 terminal of the control chip U4 and is also connected to the 3.3V power supply terminal through the twelfth resistor R12. The 2nd pin of the third optocoupler chip U7 is connected to the 5th pin of the communication interface.

[0070] The second optocoupler isolation sub-circuit 542 includes a fourth optocoupler chip U8, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17. The CAT1 terminal of the fourth optocoupler chip U8 is connected to the 3rd pin of the communication interface through the fourteenth resistor R14. The CAT2 terminal of the fourth optocoupler chip U8 is connected to the 4th pin of the communication interface through the fifteenth resistor R15. The VOUT1 terminal of the fourth optocoupler chip U8 is connected to the PB0 terminal of the control chip U4 and is also connected to the 3.3V power supply terminal through the sixteenth resistor R16. The VOUT2 terminal of the fourth optocoupler chip U8 is connected to the PB1 terminal of the control chip U4 and is also connected to the 3.3V power supply terminal through the seventeenth resistor R17.

[0071] The communication interface J3 is electrically connected to the main board of the 3D printing device through signal lines. The third optocoupler chip U7 can use an EL357 optocoupler, and the fourth optocoupler chip U8 uses a TLP2168 high-speed optocoupler. The signals between the main board and the main control are divided into three paths. One path is transmitted by the first optocoupler isolation sub-circuit 541, and the other two paths are transmitted by the second optocoupler isolation sub-circuit 542.

[0072] The magnet is arranged on the radial side of the stepper motor, and the magnetic induction coding sub-unit 51 is 1-3 mm away from the magnet. The stepper motor can have an angle of 1.8°, that is, 200 steps per revolution, and is composed of two coils A and B to form a stepper motor. After installing the motor driver board, the angle needs to be corrected before use (where correcting the angle means that the motor rotates one circle, that is, 200 steps, and each step needs to receive a position, so as to achieve precise positioning). The driving chip uses a PWM control method, with high control precision and precise positioning combined with the magnetic encoding chip. The driving current, rotation speed, etc. of the driving chip are controlled by PID, which can prevent missed steps, and the motor can hardly hear the current sound when static, and the rotation speed can reach 5000 revolutions per minute.

[0073] In the 3D printing device of the present invention, the heating drive module 3 includes at least three heating units. Please refer to Figure 10 , the heating unit converts the 3.3V voltage into 5V output through a level conversion chip U8, and can heat the glass of the 3D printing device, printing materials, etc. Since each heating unit can use the same circuit, only one of the heating units is described in detail in the present invention.

[0074] As Figure 10 shown, the 2Y, 3Y, and 4Y pins of the level conversion chip U8 are each connected to a heating unit, and the 2A, 3A, and 4A pins are connected to the PWML0 pin, PWML1 pin, and PWML2 pin of the single-chip microcomputer U1. The heating unit includes a third MOS transistor Q6, an eighteenth resistor R18, a nineteenth resistor R19, and a third diode D3. The gate of the third MOS transistor Q6 is connected to the 2Y pin of the level conversion chip U8 through the eighteenth resistor R18. The drain of the third MOS transistor Q6 is connected to the 5th pin of the heating wire interface J4 and the positive pole of the third diode D3. The negative pole of the third diode D3 is connected to the 6th pin of the heating wire interface J4 through the nineteenth resistor R19. After the control output by the single-chip microcomputer U1 is level-converted by the level conversion chip U8, the third MKOS transistor is turned on to make the corresponding heating wire work. The present invention can also heat the glass substrate to make the liquid consumables (such as acrylic materials) flat during potting, and can form a bright surface to meet the requirements of bright effect for LOGO, advertising characters, etc.

[0075] The control circuit of the 3D printing device provided by the present invention includes three fan drive units. Please refer to Figure 11, the fan driving unit includes a fourth MOS transistor Q7, a twentieth resistor R20, and a fourth diode D4. The gate of the fourth MOS transistor Q7 is connected to the TIOA4 pin of the single-chip microcomputer U1 through the twentieth resistor R20. The drain of the fourth MOS transistor Q7 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected to the fan interface J5. When heat dissipation is required, the single-chip microcomputer U1 outputs a high level to turn on the fourth MOS transistor Q7.

[0076] In the control circuit of the 3D printing device provided by the present invention, the storage module 8 includes an SD card storage module 8. As Figure 12 shown, it can use an SD card to store data, which occupies a small space and has a large storage capacity.

[0077] Furthermore, the control circuit of the 3D printing device of the present invention further includes a communication module 7 for external communication. The communication module 7 is connected to the control module 6 and is used to communicate with external devices (such as a control host, an administrator's mobile phone, a server, etc.) to report the working status of the 3D printing device in real time.

[0078] As Figure 13 shown, the control circuit of the 3D printing device provided by the present invention includes a USB communication unit for data transmission in a USB manner. As Figure 14 shown, the control circuit of the 3D printing device provided by the present invention further includes an Ethernet communication unit. The Ethernet communication unit includes a network interface chip of model W5500 and its external circuit. As Figure 15 shown, the control circuit of the 3D printing device provided by the present invention further includes a WIFI communication unit. The WIFI communication unit includes a WIFI chip of model ESP07-12 and its external circuit. The present invention uses three methods of USB, Ethernet, and WIFI to achieve data transmission and communication, ensuring real-time communication between the 3D printing device and the server and the user's mobile terminal.

[0079] As Figure 16 shown, the control circuit of the 3D printing device provided by the present invention further includes a power module. The power module converts the 24V power supply into 12V, 5V, and 3.3V voltages to supply power to each working module.

[0080] The present invention also provides a 3D printing device, including a main board, a motor drive board, and a control circuit. The glue injection drive module, curing module, heating drive module, extrusion drive module, and control module of the control circuit are arranged on the main board, and the motor drive module is arranged on the motor drive board. The present invention adopts the method of separately arranging the main board and the motor drive board, which is beneficial to the precise control of the motor and also facilitates the maintenance and repair of the device.

[0081] In summary, the present invention adopts an extrusion module and a glue injection module, realizing the printing of two materials. By adding a glue injection and its driving module, the printing of products with a flat and bright effect is achieved. Moreover, by using glue injection instead of the extrusion wire printing method, the working efficiency is greatly improved.

[0082] Meanwhile, the present invention can adopt a stepping motor and a feedback method to replace the existing open-loop stepping motor. On the premise of adding a relatively low cost, the positioning accuracy of the printing module is improved. Moreover, the use of closed-loop feedback control can increase the rotation speed of the stepping motor, and the motor can work under overload. At the same time, the motor closed-loop control circuit also communicates with the main board in real time, and feeds back the angle information of the motor to the main board in real time, so as to facilitate the real-time adjustment of the working state of the motor, thereby improving the printing accuracy.

[0083] It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or replacements should fall within the protection scope of the appended claims of the present invention.

Claims

1. A control circuit for a 3D printing device, characterized in that, Including: An extrusion driving module for driving an extrusion module to extrude linear consumables; A glue filling driving module for driving the operation of a glue filling module; A curing module for curing the liquid consumables output by the glue filling module; A heating driving module for driving a heating component to heat; A motor driving module for driving the operating state of the motor of a printing module; A control module for controlling the working states of the glue filling driving module, the curing module, the heating driving module, the extrusion driving module, and the motor driving module; The glue filling driving module, the curing module, the heating driving module, the extrusion driving module, and the motor driving module are all connected to the control module; The motor driving module includes a closed-loop stepper motor driving unit, and the closed-loop stepper motor driving unit is connected to the stepper motor for controlling the movement of the printing module and the control module; The closed-loop stepper motor driving unit includes a magnetic induction encoding sub-unit, a closed-loop driving sub-unit, and a closed-loop control sub-unit. The magnetic induction encoding sub-unit and the closed-loop driving sub-unit are connected to the closed-loop control sub-unit. The magnetic induction encoding sub-unit senses the rotation angle of the stepper motor and feeds it back to the closed-loop control sub-unit. The closed-loop control sub-unit controls the rotation state of the stepper motor by driving the closed-loop driving sub-unit according to the angle signal fed back by the magnetic induction encoding sub-unit; The closed-loop stepper motor driving unit further includes an isolation transmission sub-unit for sending the control signal of the closed-loop control sub-unit to the main board of the 3D printing device. The isolation transmission sub-unit is electrically connected to the closed-loop control sub-unit and the main board of the 3D printing device, and is used to feed back the control signal of the closed-loop control sub-unit to the main board of the 3D printing device, and send the control signal output by the main board of the 3D printing device to the closed-loop control sub-unit to accurately control the rotation angle of the stepper motor; The magnetic induction encoding sub-unit includes an isolation transmission circuit and a DIP control circuit. The isolation transmission circuit and the DIP control circuit are electrically connected to the closed-loop control sub-unit. A magnet is arranged radially on the stepper motor. When the stepper motor rotates, the magnetic field of the magnet will change. The isolation transmission circuit is arranged on one side of the stepper motor, and is used to sense the magnetic field strength of the magnet on the stepper motor, obtain the rotation angle of the stepper motor, and communicate with the closed-loop control sub-unit to feedback angle data in real time; The DIP control circuit is used to set the working mode of the stepper motor.

2. The control circuit of the 3D printing device according to claim 1, characterized in that, The glue filling driving module includes an automatic glue filling driving unit and a manual glue filling driving unit, and the automatic glue filling driving unit and the manual glue filling driving unit are connected to the control module.

3. The control circuit of the 3D printing device according to claim 2, wherein, The automatic glue filling driving unit includes an isolation sub-unit and a switch sub-unit, and the control module is connected to the glue filling module through the isolation sub-unit and the switch sub-unit in sequence.

4. The control circuit of the 3D printing device according to claim 3, wherein The curing module includes a first UV driving unit, a second UV driving unit, and a selection unit for selecting the operation of the first UV driving unit or the second UV driving unit. The first UV driving unit and the second UV driving unit are connected to the selection unit, and the selection unit is connected to the control module.

5. The control circuit of the 3D printing device according to claim 3, characterized in that, The motor driving module includes an open-loop stepper motor driving unit, and the open-loop stepper motor driving unit is connected to the stepper motor of the extrusion driving module and the control module.

6. The control circuit of the 3D printing device according to claim 3, characterized in that, The control module includes a single-chip microcomputer. The isolation sub-unit includes a first optocoupler chip, a first resistor, a second resistor, a third resistor, and a first capacitor. The first pin of the first optocoupler chip is connected to the 3.3V power supply terminal through the first resistor. The second pin of the first optocoupler chip is connected to the RTS1 pin of the single-chip microcomputer, is also connected to the manual glue injection driving unit through the second resistor, and is also grounded through the first capacitor. The fourth pin of the first optocoupler chip is connected to the switch sub-unit through the third resistor.

7. The control circuit of the 3D printing device according to claim 6, characterized in that, The switch sub-unit includes a first triode, a first MOS tube, a fourth resistor, a fifth resistor, and a first diode. The base of the first triode is connected to one end of the third resistor. The emitter of the first triode is connected to the gate of the first MOS tube and one end of the fifth resistor through the fourth resistor. The source of the first MOS tube is connected to the other end of the fifth resistor and the glue injection module. The drain of the first MOS tube is connected to the negative pole of the first diode and the 24V power supply terminal. The positive pole of the first diode is grounded.

8. A 3D printing device, comprising a main board and a motor drive board, characterized in that, It further includes the control circuit according to any one of claims 1-7. The glue injection driving module, curing module, heating driving module, extrusion driving module, and control module of the control circuit are arranged on the main board, and the motor driving module is arranged on the motor driving board.

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