Driving control card for laser scanning galvanometer of 3D printer

Abstract

The utility model relates to a 3D printer laser scanning galvanometer drive control card, which comprises a circuit board and a control circuit, and is characterized in that the control circuit comprises a power supply module, an electromagnetic compatibility module, a micro control module, an X-axis drive module, a Y-axis drive module, an X-axis motor interface, a Y-axis motor interface, a laser interface and an upper computer communication interface, the power module is electrically connected with the micro-control module, the X-axis driving module and the Y-axis driving module, the X-axis driving module and the Y-axis driving module are electrically connected with the X-axis motor interface and the Y-axis motor interface respectively and used for driving an X-axis motor and a Y-axis motor respectively, and the micro-control module is electrically connected with the X-axis driving module, the Y-axis driving module, the laser interface and the upper computer communication interface. According to the utility model, the functions of the co-control board, the interface board and the two driving boards are integrated on one circuit board, and one board card is used for realizing the communication of the upper computer, the conversion of signals into analog voltage, the servo driving of the two-axis motor and the control of the laser.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric control, and in particular relates to a 3D printer laser scanning galvanometer drive control card. Background Art

[0002] 3D printing is a type of rapid prototyping technology, also known as additive manufacturing. It is a technology that uses digital model files as the basis, uses powdered metal or plastic and other bondable materials to construct objects by printing layer by layer. The laser scanning galvanometer is a core component of the 3D printer. The control system controls the deflection of the XY-axis laser scanning galvanometer motor through the protocol interface to achieve scanning of the X and Y axes, and controls the laser to emit laser light to achieve specific shape shaping.

[0003] Conventional 3D printing systems or laser scanning and marking systems require multiple control boards to achieve laser scanning, including scanning control cards, interface processing cards, X-axis drive cards, and Y-axis drive cards. There are many types of boards and large space occupied, which cannot meet the miniaturized space design requirements of desktop nylon 3D printers.

[0004] On the other hand, the working chamber temperature of the 3D printer is very high, and the galvanometer body is sensitive to temperature. The conventional laser scanning marking system does not have galvanometer working temperature monitoring. The laser scanning galvanometer failure needs to be sent through the protocol, and there is a problem that the host computer system cannot quickly perform fault protection.

[0005] In summary, there is an urgent need to provide a 3D printer laser scanning galvanometer drive control card that meets the miniaturized space design requirements of a desktop nylon 3D printer. Utility Model Content

[0006] The utility model aims to provide a 3D printer laser scanning galvanometer drive control card which meets the miniaturized space design requirements of a desktop nylon 3D printer.

[0007] The above-mentioned purpose is achieved through the following technical solutions: a 3D printer laser scanning galvanometer drive control card, comprising a circuit board and a control circuit arranged on the circuit board, the control circuit comprising a power supply module, an electromagnetic compatibility module, a microcontroller module, an X-axis drive module and a Y-axis drive module, an X-axis motor interface, a Y-axis motor interface, a laser interface and a host computer communication interface, the electromagnetic compatibility module is electrically connected to the power supply module, the power supply module is electrically connected to the microcontroller module, the X-axis drive module and the Y-axis drive module, the X-axis motor interface and the Y-axis motor interface are respectively used to electrically connect to the X-axis motor and the Y-axis motor of the laser scanning galvanometer, the X-axis drive module and the Y-axis drive module are respectively electrically connected to the X-axis motor interface and the Y-axis motor interface and are respectively used to drive the X-axis motor and the Y-axis motor, the microcontroller module is electrically connected to the X-axis drive module, the Y-axis drive module, the laser interface and the host computer communication interface, the laser interface and the host computer communication interface are respectively used to electrically connect to the laser of the laser scanning galvanometer and the host computer.

[0008] The power supply of the whole circuit board of the utility model is + / -15V, which is input to the electromagnetic compatibility module. The electromagnetic compatibility module has an EMC protection function and can prevent the two power supplies from being reversed. The power processed by the EMC module is input to the power module, and the predetermined voltage is output to the microcontroller module, and the predetermined voltage is output to the X-axis drive module and the Y-axis drive module respectively; the X-axis drive module uses an analog control circuit and a power amplifier device to drive the X-axis motor, which is electrically connected to the X-axis motor interface; the Y-axis drive module uses an analog control circuit and a power amplifier device to drive the X-axis motor, which is electrically connected to the Y-axis motor interface; the microcontroller module is the control center of the drive control module, which is responsible for receiving the control instructions of the host computer, converting them into corresponding position voltages, and controlling the switch of the laser at the same time, so that the action of the motor is synchronized with the switch of the laser, thereby completing the laser scanning action. The laser interface is used to control the laser. This laser interface has a redundant backup, and can control fiber pulse lasers, fiber continuous lasers, and CO2 lasers, and supports IO control, PWM control, and analog control.

[0009] The utility model laser scanning galvanometer drive control card can be applied to desktop nylon 3D printers. It integrates the functions of a control board, an interface board, and two drive boards into one circuit board, and realizes host computer communication, signal conversion into analog voltage, servo drive of 2-axis motors, laser control, etc. with one board.

[0010] In a further technical solution, the control circuit is provided with a temperature interface, the temperature interface is electrically connected to a temperature sensor for detecting the working temperature in the reflective lens cavity of the laser scanning galvanometer, and the temperature interface is electrically connected to the microcontroller module. In actual application, the temperature sensor is preferably a platinum resistor, which detects the working temperature in the reflective lens cavity of the laser scanning galvanometer, and feeds back the detected temperature to the microcontroller module in real time through the temperature interface. The microcontroller module can perform a series of monitoring and protection measures according to the set temperature threshold.

[0011] In a further technical solution, the control circuit is provided with a debugging interface, the debugging interface is used to communicate with a host computer for status monitoring and debugging parameter configuration, and the debugging interface is electrically connected to the microcontroller module. In actual application, the debugging interface can adopt an RS232 debugging interface to communicate with a host computer, and can perform status monitoring, print output and debugging parameter configuration.

[0012] A further technical solution is that the control circuit is provided with an emergency IO interface, the emergency IO interface is electrically connected to the microcontroller module, and the emergency IO interface is used for rapid uplink processing of laser scanning galvanometer failures and rapid downlink processing of whole system failures. The emergency IO interface is used for rapid uplink processing of galvanometer failures and rapid downlink processing of whole system failures. In the specific application process, high-priority hardware IO interrupts can be directly used to achieve maximum rapid protection, thereby preventing uncontrollable laser damage.

[0013] According to a further technical solution, the control circuit is provided with a fault monitoring module, which is electrically connected to the microcontroller module. The fault monitoring module is used for fault monitoring of the laser scanning galvanometer and reports the fault information to the microcontroller module. Specific fault monitoring includes power supply voltage, motor position overrun, motor encoder fault, etc. When a fault is found, an LED indication can be immediately performed, and the fault information is reported to the MCU, which then adopts a fault protection processing mechanism.

[0014] In a further technical solution, the control circuit is provided with a voltage conversion module, the microcontroller module is electrically connected to the X-axis drive module and the Y-axis drive module through the voltage conversion module, the voltage conversion module receives two analog voltages of 0 to 3.3V output by the microcontroller module, and converts the received two analog voltages of 0 to 3.3V into two analog voltages of -5 to 5V through an operation circuit, and then outputs them to the X-axis drive module and the Y-axis drive module respectively. In a specific application process, different analog drive voltages correspond to different deflection angles of the motor.

[0015] According to a further technical solution, the power supply module outputs a 3.3V voltage to the microcontroller module, and outputs a +15V or -15V voltage to the X-axis drive module and the Y-axis drive module respectively.

[0016] In a further technical solution, the host computer communication interface is a USB interface, which is the main bus interface for communicating with the host computer. Specifically, the USB interface can adopt a USB2.0 interface, the host computer sends the control instruction to the microcontroller module via the USB, and the microcontroller module sends the relevant status or request information to the host computer, and the communication uses a master-slave structure, with the control card end as a slave device.

[0017] According to a further technical solution, the microcontroller module is an MCU or a DSP using an external DAC chip.

[0018] In a further technical solution, the electromagnetic compatibility module is an EMC module, which is used to connect to the power supply and input the processed power to the power supply module. The EMC module has an EMC protection function and can prevent the two power supplies from being reversely connected.

[0019] Compared with the prior art, the utility model is applied to the laser scanning galvanometer drive control card of the desktop nylon 3D printer, which integrates the functions of the same control board, interface board, and 2 drive boards, a total of 4PCS boards, into one circuit board, and uses one board to realize the marking function. The hardware is highly centralized, and the miniaturized design board size is small, which meets the miniaturized space design requirements of the desktop nylon 3D printer. Secondly, the real-time temperature in the galvanometer reflector lens cavity can be monitored to ensure that the galvanometer works within a reliable temperature range; for temperature scenes exceeding the threshold, the whole machine adopts fault protection and processing mechanisms; at the same time, high-priority hardware IO interrupts are used for uplink and downlink fault reporting to achieve the maximum degree of rapid protection, thereby preventing uncontrollable laser damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 The present invention is a block diagram of the principle structure of a 3D printer laser scanning galvanometer drive control card involved in one embodiment of the present invention.

[0022] In the figure:

[0023] 1EMC module 2Temperature interface 3Power module 4MCU

[0024] 5RS232 debugging interface 6Emergency IO interface 7USB interface 8Voltage conversion module 9Laser interface 10Y-axis drive module 11Y-axis motor interface 12X-axis drive module 13X-axis motor interface 14Fault monitoring module DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention. In addition, those skilled in the art can make corresponding combinations of the features in the embodiments and in different embodiments of the present invention according to the description of this document.

[0026] The utility model embodiments are as follows, referring to Figure 1 A 3D printer laser scanning galvanometer drive control card includes a circuit board and a control circuit arranged on the circuit board, the control circuit includes a power module 3, an electromagnetic compatibility module, a microcontroller module, an X-axis drive module 12 and a Y-axis drive module 10, an X-axis motor interface 13, a Y-axis motor interface 11, a laser interface 9 and a host computer communication interface, the electromagnetic compatibility module is electrically connected to the power module 3, the power module 3 is electrically connected to the microcontroller module, the X-axis drive module 12 and the Y-axis drive module 10, the X-axis motor interface 13, the Y-axis motor interface 11, the laser interface 9 and the host computer communication interface. 3 and Y-axis motor interface 11 are respectively used to be electrically connected to the X-axis motor and Y-axis motor of the laser scanning galvanometer, the X-axis drive module 12 and the Y-axis drive module 10 are respectively electrically connected to the X-axis motor interface 13 and the Y-axis motor interface 11 and are respectively used to drive the X-axis motor and the Y-axis motor, the microcontroller module is electrically connected to the X-axis drive module 12, the Y-axis drive module 10, the laser interface 9 and the host computer communication interface, and the laser interface 9 and the host computer communication interface are respectively used to be electrically connected to the laser of the laser scanning galvanometer and the host computer.

[0027] The power supply of the whole circuit board of the utility model is + / -15V, which is input to the electromagnetic compatibility module. The electromagnetic compatibility module has an EMC protection function and can prevent the two power supplies from being reversed. The power processed by the EMC module 1 is input to the power module 3, and the predetermined voltage is output to the microcontroller module, and the predetermined voltage is output to the X-axis drive module 12 and the Y-axis drive module 10 respectively; the X-axis drive module 12 uses an analog control circuit and a power amplifier device to drive the X-axis motor, and is electrically connected to the X-axis motor interface 13; the Y-axis drive module 10 uses an analog control circuit and a power amplifier device to drive the X-axis motor, and is electrically connected to the Y-axis motor interface 11; the microcontroller module is the control center of the drive control module, which is responsible for receiving the control instructions of the host computer, converting them into corresponding position voltages, and controlling the switch of the laser at the same time, so that the action of the motor is synchronized with the switch of the laser, thereby completing the laser scanning action. The laser interface 9 is used to control the laser. The laser interface 9 has a redundant backup, and can control fiber pulse lasers, fiber continuous lasers, and CO2 lasers, and supports IO control, PWM control, and analog control.

[0028] The utility model laser scanning galvanometer drive control card can be applied to desktop nylon 3D printers, such as Figure 1 , integrating the functions of the control board, interface board and two driver boards into one circuit board, and using one board to realize the following functions: host computer communication, signal conversion into analog voltage, servo drive of 2-axis motor, laser control, etc.

[0029] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The control circuit is provided with a temperature interface 2, and the temperature interface 2 is electrically connected to a temperature sensor for detecting the working temperature in the reflective lens cavity of the laser scanning galvanometer. The temperature interface 2 is electrically connected to the microcontroller module. In actual application, the temperature sensor is preferably a platinum resistor, which detects the working temperature in the reflective lens cavity of the laser scanning galvanometer, and feeds back the detected temperature to the microcontroller module in real time through the temperature interface 2. The microcontroller module can perform a series of monitoring and protection measures according to the set temperature threshold.

[0030] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The control circuit is provided with a debugging interface, and the debugging interface is used to communicate with the host computer for status monitoring and debugging parameter configuration, and the debugging interface is electrically connected to the microcontroller module. In actual application, the debugging interface can adopt RS232 debugging interface 5, communicate with the host computer, and can perform status monitoring, print output and debugging parameter configuration.

[0031] Based on the above embodiment, in another embodiment of the utility model, as Figure 1The control circuit is provided with an emergency IO interface 6, which is electrically connected to the microcontroller module and is used for rapid uplink processing of laser scanning galvanometer failures and rapid downlink processing of whole system failures. The emergency IO interface 6 is used for rapid uplink processing of galvanometer failures and rapid downlink processing of whole system failures. In specific applications, high-priority hardware IO interrupts can be used directly to achieve maximum rapid protection, thereby preventing uncontrollable laser damage.

[0032] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The control circuit is provided with a fault monitoring module 14, which is electrically connected to the microcontroller module. The fault monitoring module 14 is used for fault monitoring of the laser scanning galvanometer and reports the fault information to the microcontroller module. Specific fault monitoring includes power supply voltage, motor position overrun, motor encoder fault, etc. If a fault is found, an LED indication can be immediately performed, and the fault information is reported to the MCU4, which then adopts a fault protection processing mechanism.

[0033] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The control circuit is provided with a voltage conversion module 8, and the microcontroller module is electrically connected to the X-axis drive module 12 and the Y-axis drive module 10 through the voltage conversion module 8. The voltage conversion module 8 receives two analog voltages of 0 to 3.3V output by the microcontroller module, and converts the received two analog voltages of 0 to 3.3V into two analog voltages of -5 to 5V through an operation circuit, and then outputs them to the X-axis drive module 12 and the Y-axis drive module 10 respectively. In a specific application process, different analog drive voltages correspond to different deflection angles of the motor.

[0034] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The power module 3 outputs a 3.3V voltage to the microcontroller module, and outputs a +15V or -15V voltage to the X-axis driving module 12 and the Y-axis driving module 10 respectively.

[0035] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The host computer communication interface is a USB interface 7, which is the main bus interface for communicating with the host computer. Specifically, the USB interface 7 can adopt a USB2.0 interface. The host computer sends the control instruction to the microcontroller module through the USB, and the microcontroller module sends the relevant status or request information to the host computer. The communication uses a master-slave structure, and the drive control card end is used as a slave device.

[0036] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 , the microcontroller module is MCU4 or a DSP using an external DAC chip.

[0037] Based on the above embodiment, in another embodiment of the utility model, as Figure 1 The electromagnetic compatibility module is an EMC module 1, which is used to connect to the power supply and input the processed power to the power supply module 3. The EMC module 1 has an EMC protection function and can prevent the reverse connection of two power supplies.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A 3D printer laser scanning galvanometer drive control card, comprising a circuit board and a control circuit arranged on the circuit board, characterized in that: The control circuit includes a power module, an electromagnetic compatibility module, a microcontroller module, an X-axis drive module and a Y-axis drive module, an X-axis motor interface, a Y-axis motor interface, a laser interface and a host computer communication interface. The electromagnetic compatibility module is electrically connected to the power module, and the power module is electrically connected to the microcontroller module, the X-axis drive module and the Y-axis drive module. The X-axis motor interface and the Y-axis motor interface are respectively used to be electrically connected to the X-axis motor and the Y-axis motor of the laser scanning galvanometer. The X-axis drive module and the Y-axis drive module are respectively electrically connected to the X-axis motor interface and the Y-axis motor interface and are respectively used to drive the X-axis motor and the Y-axis motor. The microcontroller is electrically connected to the X-axis drive module, the Y-axis drive module, the laser interface and the host computer communication interface. The laser interface and the host computer communication interface are respectively used to be electrically connected to the laser of the laser scanning galvanometer and the host computer.

2. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The control circuit is provided with a temperature interface, and the temperature interface is electrically connected to a temperature sensor for detecting the working temperature in the reflective lens cavity of the laser scanning galvanometer, and the temperature interface is electrically connected to the microcontroller module.

3. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The control circuit is provided with a debugging interface, and the debugging interface is used to communicate with a host computer to perform status monitoring and debugging parameter configuration, and the debugging interface is electrically connected to the microcontroller module.

4. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The control circuit is provided with an emergency IO interface, which is electrically connected to the microcontroller module. The emergency IO interface is used for rapid uplink processing of laser scanning galvanometer failures and rapid downlink processing of complete system failures.

5. The 3D printer laser scanning galvanometer drive control card according to claim 4, characterized in that: The control circuit is provided with a fault monitoring module, which is electrically connected to the microcontrol module. The fault monitoring module is used for fault monitoring of the laser scanning galvanometer and reports fault information to the microcontrol module.

6. The 3D printer laser scanning galvanometer drive control card according to any one of claims 1 to 5, characterized in that: The control circuit is provided with a voltage conversion module, and the microcontroller module is electrically connected to the X-axis drive module and the Y-axis drive module through the voltage conversion module. The voltage conversion module receives two 0-3.3V analog voltages output by the microcontroller module, and converts the received two 0-3.3V analog voltages into two -5-5V analog voltages through an operation circuit, and then outputs them to the X-axis drive module and the Y-axis drive module respectively.

7. The 3D printer laser scanning galvanometer drive control card according to claim 6, characterized in that: The power supply module outputs a 3.3V voltage to the microcontroller module, and outputs a +15V or -15V voltage to the X-axis drive module and the Y-axis drive module respectively.

8. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The host computer communication interface is a USB interface, and the USB interface is the main bus interface for communicating with the host computer.

9. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The microcontroller module is an MCU or a DSP using an external DAC chip.

10. The 3D printer laser scanning galvanometer drive control card according to claim 1, characterized in that: The electromagnetic compatibility module is an EMC module, which is used to connect to the power supply and input the processed power to the power module.

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