Laser processing control device

Abstract

The present invention discloses a laser processing control device, which relates to the field of laser processing technology, and includes: a microcontroller, a laser control functional circuit, an IO control circuit, and a height adjustment device functional circuit. The microcontroller is connected to the laser control functional circuit, the IO control circuit, and the height adjustment device functional circuit respectively. The microcontroller receives parameter signals from a host computer of the laser processing equipment, and controls the laser control functional circuit, the IO control circuit, and the height adjustment device functional circuit to realize corresponding functions. The present invention can integrate the scattered laser controllers, height adjustment devices, and IO modules in the prior art, open development interfaces, and improve adaptability and expansibility; it can also control the laser switch signal by hardware interruption, significantly shortening the laser signal response time, thereby reducing the influence of the laser switch delay on the laser processing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and in particular to a laser processing control device. Background Art

[0002] Laser processing technology is a processing technology that uses the characteristics of the interaction between laser beams and materials to cut, weld, surface treat, punch and micro-process materials. In the manufacturing industry, laser processing technology has significant advantages. Compared with traditional processing methods, such as mechanical cutting and stamping, laser processing can achieve higher precision and smaller tolerances, especially in the processing of parts with complex shapes and high precision requirements. Metal laser cutting technology uses a focused high-power density laser beam to irradiate the workpiece, so that the irradiated material quickly melts, vaporizes, ablates or reaches the ignition point, and at the same time uses a high-speed airflow coaxial with the beam to blow away the molten material, so as to achieve the workpiece. At the same time, the beam is controlled to move along a specific trajectory and the distance between the laser beam focus and the workpiece surface is kept at a specific distance, so that the required workpiece can be processed. The principle is: the laser converts electrical energy into light energy and transmits it to the cutting head through optical fiber. The laser beam is divergent and needs to be shaped into nearly parallel light with a collimator, and then focused into a high-density light spot through a focusing lens. The protective lens is used to protect the optical components inside the cutting head from contamination and damage. Finally, the laser is released through the laser nozzle and irradiated onto the surface of the workpiece, causing the material to heat and melt or vaporize to form an incision.

[0003] Based on the above laser processing technology principles, a laser processing device or system needs to have three key parts: laser, motion mechanism, and auxiliary devices such as gas path control. The laser is used to generate a laser beam, the motion mechanism drives the laser to move, and the gas path control provides auxiliary gas for laser processing. At present, laser control mainly has internal control mode and external control mode. In the internal control mode, the system sends specific instructions to the laser through 232 communication to set the frequency, duty cycle, and power parameters to the laser. The laser generates a PWM pulse modulation signal based on the parameters to control the generation of the laser beam and control its switch. In the external control mode, the system generates a PWM pulse modulation signal and an analog power control signal through an external laser controller, which is connected to the laser to control the generation of the laser beam. The switch of the laser beam is controlled by a digital switch signal, and the laser alarm signal is received. The motion mechanism is generally controlled by the motion control and drive system. The motor drives the laser to move along the trajectory to be processed through some mechanical structures. In addition, due to the ups and downs of the workpiece surface, a height adjustment device is required to detect the distance between the laser copper nozzle and the workpiece surface in real time, and control the movement of the motion mechanism in this direction to keep the distance between the laser copper nozzle and the workpiece surface unchanged. Gas path control is generally controlled by the IO module through digital switch signals to control the switch of the gas path, the selection of gas, and the detection and control of gas pressure through analog signals.

[0004] The laser controller, height adjustment device, and IO module in the prior art are usually three independent modules provided by manufacturers of different brands. The three modules also have different communication protocols with the host computer, and the integration is not high. At the same time, the laser controller in the prior art usually has a delay of about 2 milliseconds from receiving the laser switch control signal to controlling the switch of the PWM pulse modulation signal, which will cause the laser switch to be untimely and affect the processing accuracy, especially in the case of high-precision laser processing. The impact is particularly obvious. In addition, the height adjustment device in the prior art includes a capacitive sensor, an amplifier, and a height adjustment controller. The height adjustment controller generally communicates with the host computer through Ethernet, and is usually bound to the laser processing system of the same brand manufacturer. The development interface is not open to the outside world, and the adaptability and expansibility are poor. Equipment manufacturers cannot customize personalized laser processing systems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies of the prior art, specifically the problems of low integration and laser signal delay, and specifically provide a laser processing control device, which is as follows:

[0006] The present invention provides a laser processing control device, and the specific technical scheme is as follows: comprising: a microcontroller, a laser control functional circuit, an IO control circuit and a height adjustment device functional circuit;

[0007] The microcontroller includes a first DAC module, a second DAC module, a PWM module, an IO module and an ENCODER module;

[0008] The laser control function circuit comprises a first operational amplifier circuit, a driving circuit, a first analog output interface and a PWM signal output interface; one end of the first operational amplifier circuit is connected to the first DAC module, and the other end of the first operational amplifier circuit is connected to one end of the first analog output interface; one end of the driving circuit is connected to the PWM module, and the other end of the driving circuit is connected to one end of the PWM signal output interface; the laser is respectively connected to the other end of the first analog output interface and the other end of the PWM signal output interface;

[0009] The IO control circuit includes at least one DI port; any DI port is connected to the IO module;

[0010] The functional circuit of the height adjustment device includes a closed-loop servo control circuit; the closed-loop servo control circuit includes a second operational amplifier circuit, a differential signal circuit, an encoder signal port and a second analog output interface; one end of the second operational amplifier circuit is connected to the second DAC module, and the other end of the second operational amplifier circuit is connected to one end of the second analog output interface; one end of the differential signal circuit is connected to the ENCODER module, and the other end of the differential signal circuit is connected to one end of the encoder signal port; the driver is respectively connected to the other end of the second analog output interface and the other end of the encoder signal port.

[0011] The beneficial effects of a laser processing control device provided by the present invention are as follows:

[0012] The laser control function circuit, IO control circuit and height adjustment device function circuit are integrated into one device and implemented with a microprocessor, which greatly improves the system integration of laser processing equipment, reduces the difficulty of system development, and reduces the equipment material cost and maintenance cost. Multiple DI ports are set in the IO control circuit to receive multiple input signals. When the laser switch input signal is received through any DI port, the laser switch input signal is input into the IO module through the optical coupling isolation circuit. According to the internal communication of the microcontroller, the laser switch input signal in the IO module is transmitted to the PWM module. According to the laser switch input signal, the PWM module controls the PWM signal, which can achieve a delay of only 3 microseconds from receiving the laser opening control signal to controlling the switch of the PWM pulse modulation signal, which greatly improves the timeliness of the laser switch, thereby improving the processing accuracy and meeting the application requirements of high-precision laser processing occasions.

[0013] Based on the above solution, the present invention can also be improved as follows.

[0014] Furthermore, the laser control functional circuit further includes: a digital isolation circuit;

[0015] One end of the digital isolation circuit is connected to the PWM module, and the other end of the digital isolation circuit is connected to one end of the driving circuit.

[0016] Furthermore, the IO control circuit also includes an optocoupler isolation circuit;

[0017] One end of the optocoupler isolation circuit is connected to the IO module, and the other end of the optocoupler isolation circuit is connected to any DI port.

[0018] Further, the IO control circuit also includes at least one DO port;

[0019] Any DO port is connected to the other end of the optical coupler isolation circuit.

[0020] Further, the IO control circuit also includes a functional IO port;

[0021] One end of the functional IO port is connected to the other end of the optical coupling isolation circuit, and the other end of the functional IO port is connected to the driver.

[0022] Further, the IO control circuit also includes left and right limit ports;

[0023] One end of the left and right limit ports is connected to the other end of the optical coupling isolation circuit.

[0024] Furthermore, the height adjustment device functional circuit also includes a height sensing circuit;

[0025] The height sensing circuit includes a Schmidt circuit and a sensor interface;

[0026] One end of the Schmitt circuit is connected to the counter module in the microcontroller, and the other end of the Schmitt circuit is connected to one end of the sensor interface.

[0027] Furthermore, the height sensing circuit further includes: a capacitance amplification module and a capacitance head;

[0028] One end of the capacitance amplification module is connected to the other end of the sensor interface, and the other end of the capacitance amplification module is connected to the capacitance head, and the capacitance head is mounted on the laser.

[0029] Further, it also includes: an EtherCAT module;

[0030] One end of the EtherCAT module is connected to the SPI module in the microcontroller, and the other end of the EtherCAT module is connected to the EtherCAT bus communication network through any IN network port.

[0031] Furthermore, the EtherCAT module also includes at least one OUT network port.

[0032] The benefits of adopting the above solution are as follows:

[0033] The mainstream EtherCAT bus communication method in industrial automation systems is adopted, the communication method is unified, and the development interface is opened, so that the height adjustment device can support equipment manufacturers to carry out personalized customization and development of laser processing systems, greatly improving the adaptability and scalability of laser processing systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0035] Figure 1 It is a structural schematic diagram of a laser processing control device according to an embodiment of the present invention;

[0036] Figure 2 The figure is a schematic diagram of the working condition of a height adjustment shaft according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, a laser processing control device according to an embodiment of the present invention includes: a microcontroller, a laser control functional circuit, an IO control circuit and a height adjustment device functional circuit;

[0039] The microcontroller includes a first DAC module, a second DAC module, a PWM module, an IO module and an ENCODER module;

[0040] The laser control function circuit includes a first operational amplifier circuit, a driving circuit, a first analog output interface and a PWM signal output interface; one end of the first operational amplifier circuit is connected to the first DAC module, and the other end of the first operational amplifier circuit is connected to one end of the first analog output interface; one end of the driving circuit is connected to the PWM module, and the other end of the driving circuit is connected to one end of the PWM signal output interface; the laser is respectively connected to the other end of the first analog output interface and the other end of the PWM signal output interface;

[0041] The IO control circuit includes at least one DI port; any DI port is connected to the IO module;

[0042] The functional circuit of the height adjustment device includes a closed-loop servo control circuit; the closed-loop servo control circuit includes a second operational amplifier circuit, a differential signal circuit, an encoder signal port and a second analog output interface; one end of the second operational amplifier circuit is connected to the second DAC module, and the other end of the second operational amplifier circuit is connected to one end of the second analog output interface; one end of the differential signal circuit is connected to the ENCODER module, and the other end of the differential signal circuit is connected to one end of the encoder signal port; the driver is respectively connected to the other end of the second analog output interface and the other end of the encoder signal port.

[0043] The beneficial effects of a laser processing control device provided by the present invention are as follows:

[0044] The laser control function circuit, IO control circuit and height adjustment device function circuit are integrated into one device and implemented with a microprocessor, which greatly improves the system integration of laser processing equipment, reduces the difficulty of system development, and reduces the equipment material cost and maintenance cost. Multiple DI ports are set in the IO control circuit to receive multiple input signals. When the laser switch input signal is received through any DI port, the laser switch input signal is input into the IO module through the optical coupling isolation circuit. According to the internal communication of the microcontroller, the laser switch input signal in the IO module is transmitted to the PWM module. According to the laser switch input signal, the PWM module controls the PWM signal, which can achieve a delay of only 3 microseconds from receiving the laser opening control signal to controlling the switch of the PWM pulse modulation signal, which greatly improves the timeliness of the laser switch, thereby improving the processing accuracy and meeting the application requirements of high-precision laser processing occasions.

[0045] The microcontroller includes a first DAC module, a second DAC module, a PWM module, an IO module and an ENCODER module;

[0046] The laser processing control device also includes: an EtherCAT module; one end of the EtherCAT module is connected to the SPI module in the microcontroller, and the other end of the EtherCAT module is connected to the EtherCAT bus communication network through any IN network port. The EtherCAT module also includes at least one OUT network port. Among them:

[0047] The EtherCAT module integrates the EtherCAT slave function, which has at least one IN network port and at least one OUT network port. The laser processing control device can be connected to the EtherCAT bus communication network of the laser processing equipment through the two network ports. The laser processing equipment host computer can communicate with the laser processing control device, and use the laser control, gas path control, adjustment axis control and other functions through the variables provided by the laser processing control device. It should be noted that EtherCAT refers to Ethernet control automation technology, which is an open architecture and belongs to the existing technology, so it will not be repeated.

[0048] The SPI module in the microcontroller is connected to the EtherCAT module for two-way communication, receiving the parameters set by the host computer to the microcontroller through the EtherCAT bus network, and sending the internal parameters of the microcontroller to the host computer through the EtherCAT bus network.

[0049] The beneficial effects of adopting the above scheme are as follows:

[0050] The present invention adopts the same EtherCAT bus communication method as the existing motion control system of laser processing equipment, and can be integrated into the control system of laser processing equipment as a slave station. The present invention integrates the functions of the three originally independent modules of laser control, height control, and IO control into one device, which is implemented with a microprocessor, greatly improving the system integration of laser processing equipment, reducing the difficulty of system development, and reducing equipment material costs and maintenance costs, avoiding the problem in the prior art that the three modules have different communication protocols with the host computer and the integration is not high.

[0051] The laser control functional circuit includes a first operational amplifier circuit, a driving circuit, a first analog output interface and a PWM signal output interface; one end of the first operational amplifier circuit is connected to the first DAC module, and the other end of the first operational amplifier circuit is connected to one end of the first analog output interface; one end of the driving circuit is connected to the PWM module, and the other end of the driving circuit is connected to one end of the PWM signal output interface; the laser is respectively connected to the other end of the first analog output interface and the other end of the PWM signal output interface.

[0052] The laser control function circuit also includes: a digital isolation circuit; one end of the digital isolation circuit is connected to the PWM module, and the other end of the digital isolation circuit is connected to one end of the drive circuit.

[0053] The laser control function circuit is generally divided into two parts: one is the analog output circuit part that controls the maximum output power of the laser, and the other is the PWM signal (i.e. pulse modulation signal) output circuit part that controls the average power of the laser.

[0054] In the analog output circuit part that controls the maximum output power of the laser, one end of the first op amp circuit is connected to the first DAC (digital-to-analog conversion) module, and the other end of the first op amp circuit is connected to one end of the first analog output interface to form an analog output circuit. The microcontroller converts the analog voltage parameter for setting the maximum power of the laser received from the host computer into the output voltage corresponding to the first DAC module, outputs it to the first op amp circuit, and after amplification by the first op amp circuit, outputs it to the laser through the first analog output interface, thereby realizing the function of controlling the maximum output power of the laser. It should be noted that both the first DAC module and the second DAC module have digital-to-analog conversion functions, and the difference lies in the different specific conversion data.

[0055] In the PWM signal output circuit part that controls the average power of the laser, one end of the digital isolation circuit is connected to the PWM module, the other end of the digital isolation circuit is connected to one end of the drive circuit, and the other end of the drive circuit is connected to one end of the PWM signal output interface, forming a PWM signal output circuit. The microcontroller controls the PWM signal of the corresponding parameters of the PWM module product according to the frequency and duty cycle parameters of the set pulse modulation signal received from the host computer. After passing through the digital isolation circuit, it is amplified by the drive circuit and output to the laser through the PWM signal output interface, thereby realizing the function of controlling the average power of the laser. Among them, the function of the digital isolation circuit is to isolate the interference signal that may exist in the external circuit to the microprocessor.

[0056] The IO control circuit includes at least one DI port; any DI port is connected to the IO module.

[0057] The IO control circuit also includes an optocoupler isolation circuit; one end of the optocoupler isolation circuit is connected to the IO module, and the other end of the optocoupler isolation circuit is connected to any DI port.

[0058] The IO control circuit also includes at least one DO port; any DO port is connected to the other end of the optical coupler isolation circuit.

[0059] The IO control circuit also includes a functional IO port; one end of the functional IO port is connected to the other end of the optocoupler isolation circuit, and the other end of the functional IO port is connected to the driver.

[0060] The IO control circuit also includes left and right limit ports; one end of the left and right limit ports is connected to the other end of the optical coupling isolation circuit.

[0061] The DI port can be used to receive a variety of input signals, and the DO port can be used to control the switch of the gas path device. When any of the DI ports receives a laser switch input signal triggered based on the motion trajectory position from the motion control system of the laser processing equipment, the signal is input to the IO module after being isolated from interference by the optocoupler isolation circuit. The microcontroller controls the PWM signal output by the PWM module switch through hardware interrupts, thereby achieving high-speed response and timely switching of the laser. It should be noted that IO refers to input / output, DI refers to digital input, and DO refers to digital output.

[0062] The beneficial effects of adopting the above scheme are as follows:

[0063] The present invention adopts hardware interruption to realize the function of controlling PWM pulse modulation signal switch, so that the laser switch delay is shortened from about 2 milliseconds in the prior art to about 3 microseconds, which greatly improves the timeliness of the laser switch, thereby greatly reducing the influence of the laser switch delay on the laser processing accuracy, improving the processing accuracy, and meeting the application requirements of high-precision laser processing occasions.

[0064] The functional IO port can be used to control the enabling of the height-adjusting axis motor servo driver, receive alarm signals, clear alarm signals, etc.

[0065] The left and right limit ports can be used to access the limit signals of the left and right movement stroke of the height adjustment axis.

[0066] The functional circuit of the height adjustment device includes a closed-loop servo control circuit; the closed-loop servo control circuit includes a second operational amplifier circuit, a differential signal circuit, an encoder signal port and a second analog output interface; one end of the second operational amplifier circuit is connected to the second DAC module, and the other end of the second operational amplifier circuit is connected to one end of the second analog output interface; one end of the differential signal circuit is connected to the ENCODER module, and the other end of the differential signal circuit is connected to one end of the encoder signal port; the driver is respectively connected to the other end of the second analog output interface and the other end of the encoder signal port.

[0067] The height adjustment device functional circuit also includes a height sensing circuit; the height sensing circuit includes a Schmidt circuit and a sensor interface; one end of the Schmidt circuit is connected to a counter module in the microcontroller, and the other end of the Schmidt circuit is connected to one end of the sensor interface.

[0068] The height sensing circuit also includes: a capacitor amplification module and a capacitor head; one end of the capacitor amplification module is connected to the other end of the sensor interface, and the other end of the capacitor amplification module is connected to the capacitor head, and the capacitor head is installed on the laser.

[0069] The functional circuit of the height adjustment device is generally divided into two parts: one is the closed-loop servo control circuit part, and the other is the height sensing circuit part.

[0070] In the closed-loop servo control circuit part, one end of the second operational amplifier circuit is connected to the second DAC module, the other end of the second operational amplifier circuit is connected to one end of the second analog output interface, one end of the differential signal circuit is connected to the ENCODER module, the other end of the differential signal circuit is connected to one end of the encoder signal port, and the driver is respectively connected to the other end of the second analog output interface and the other end of the encoder signal port, thereby forming a closed-loop servo control circuit. The implementation process is as follows: the microcontroller receives the displacement instructions and parameters set by the host computer, or the displacement instructions and parameters calculated by the microcontroller's internal height control algorithm, converts it into a command speed value, converts it into the output voltage value required by the second DAC module, and outputs it to the second operational amplifier circuit. After amplification by the second operational amplifier circuit, it is output to the driver through the second analog output interface. The driver drives the height axis to move according to the received analog quantity, such as Figure 2 It is a schematic diagram of the working condition of a height-adjusting shaft; the height-adjusting shaft movement produces position changes, and the position changes are synchronously fed back to the encoder signal port. The encoder signal port receives the position changes and inputs them into the ENCODER module after processing through the differential signal circuit. The microcontroller calculates the corresponding feedback speed value based on the feedback position change signal, compares the feedback speed value with the command speed value, and continuously adjusts it according to the PID motion control algorithm to ensure that the height-adjusting shaft reaches the command speed, thereby moving to the specified position, realizing the closed-loop servo control function, and further ensuring the accuracy and stability of the height-adjusting shaft operation. It should be noted that ENCODER refers to encoding, which is used to compile and convert signals (such as bit streams) or data into signal forms that can be used for communication, transmission and storage. PID refers to proportional integral control, which belongs to the prior art and is not described here.

[0071] In the height sensing circuit part, one end of the Schmidt circuit is connected to the counter module in the microcontroller, the other end of the Schmidt circuit is connected to one end of the sensor interface, one end of the capacitor amplifier module is connected to the other end of the sensor interface, and the other end of the capacitor amplifier module is connected to the capacitor head, which is installed on the laser, thereby forming a height sensing circuit. When the distance between the laser nozzle and the workpiece is within the range of the capacitor head, the capacitor head will sense the capacitance between it and the workpiece, which will be amplified and processed by the capacitor amplifier module and converted into an analog signal of a specific frequency and output to the Schmidt circuit through the sensor interface. After being shaped into a digital signal of the corresponding frequency by the Schmidt circuit, it is output to the counter module. The microcontroller calculates the frequency value of the input digital signal through the counter module, and the frequency value can correspond to the distance between the laser nozzle and the workpiece, that is, the height value. It should be noted that the correspondence between the frequency value and the height value is not linear, and the correspondence between the sensed frequency value and the height value will be different for different materials. Therefore, after using the height sensing circuit for the first time or changing the material, a height calibration action is required, that is, to determine the correspondence table between the frequency value and the height value. After the calibration is completed, the microcontroller can convert the frequency value of the input digital signal into a height value, thereby realizing the height sensing function. At the same time, during laser processing, due to the uneven surface of the material, when the motion mechanism drives the laser to move for processing, the distance between the laser nozzle and the workpiece surface will continue to change. The microcontroller is integrated with a height adjustment following algorithm, which will calculate the distance value required to adjust the height adjustment axis in real time according to the height change value sensed by the height sensing circuit, and then convert it into the command speed. The height adjustment axis is controlled to move through a closed-loop servo control circuit, and the distance between the laser nozzle and the workpiece surface is adjusted in real time to ensure that the distance between the laser nozzle and the workpiece surface remains unchanged during the laser processing process, thereby realizing the control of the laser beam focus position relative to the workpiece surface. The distance remains unchanged and the height adjustment device function is realized.

[0072] The beneficial effects of adopting the above scheme are as follows:

[0073] The present invention adopts the method of replacing only the height control part in the existing height adjustment device, while retaining the capacitance amplifier and capacitance sensor in the existing height adjustment device, breaking the blockade of the height adjustment controller in the prior art that generally communicates with the host computer through Ethernet, is usually bound to the laser processing system of the same brand manufacturer, does not open the development interface to the outside, has poor adaptability and expansibility, and equipment manufacturers cannot customize personalized laser processing systems. The present invention adopts the mainstream EtherCAT bus communication method in the industrial automation system and opens the development interface, so that the height adjustment device can support the equipment manufacturer to carry out personalized customization and development of the laser processing system, greatly improving the adaptability and expansibility of the laser processing system.

[0074] In addition, it should be noted that the functions implemented by the Schmitt circuit, the first op amp circuit, the second op amp circuit, the digital isolation circuit, the drive circuit, the differential signal circuit, the optocoupler isolation circuit, etc. mentioned in this embodiment can be implemented in a variety of ways, all of which are alternatives to the present technical solution.

[0075] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A laser processing control device, characterized in that: include: Microcontroller, laser control functional circuit, IO control circuit and height adjustment device functional circuit; The microcontroller includes a first DAC module, a second DAC module, a PWM module, an IO module and an ENCODER module; The laser control function circuit comprises a first operational amplifier circuit, a driving circuit, a first analog output interface and a PWM signal output interface; one end of the first operational amplifier circuit is connected to the first DAC module, and the other end of the first operational amplifier circuit is connected to one end of the first analog output interface; one end of the driving circuit is connected to the PWM module, and the other end of the driving circuit is connected to one end of the PWM signal output interface; the laser is respectively connected to the other end of the first analog output interface and the other end of the PWM signal output interface; The IO control circuit includes at least one DI port; any DI port is connected to the IO module; The functional circuit of the height adjustment device includes a closed-loop servo control circuit; the closed-loop servo control circuit includes a second operational amplifier circuit, a differential signal circuit, an encoder signal port and a second analog output interface; one end of the second operational amplifier circuit is connected to the second DAC module, and the other end of the second operational amplifier circuit is connected to one end of the second analog output interface; one end of the differential signal circuit is connected to the ENCODER module, and the other end of the differential signal circuit is connected to one end of the encoder signal port; the driver is respectively connected to the other end of the second analog output interface and the other end of the encoder signal port; Wherein, the microcontroller controls the PWM module by hardware interruption; The height adjustment device functional circuit also includes a height sensing circuit; The height sensing circuit includes a Schmidt circuit and a sensor interface; One end of the Schmitt circuit is connected to the counter module in the microcontroller, and the other end of the Schmitt circuit is connected to one end of the sensor interface; The height sensing circuit also includes: a capacitance amplification module and a capacitance head; One end of the capacitance amplification module is connected to the other end of the sensor interface, and the other end of the capacitance amplification module is connected to the capacitance head, and the capacitance head is installed on the laser; The IO control circuit also includes an optocoupler isolation circuit; One end of the optical coupler isolation circuit is connected to the IO module, and the other end of the optical coupler isolation circuit is connected to any DI port; The IO control circuit also includes at least one DO port; Any DO port is connected to the other end of the optical coupler isolation circuit; The IO control circuit also includes a functional IO port; One end of the functional IO port is connected to the other end of the optical coupling isolation circuit, and the other end of the functional IO port is connected to the driver; The IO control circuit also includes left and right limit ports; One end of the left and right limit ports is connected to the other end of the optical coupling isolation circuit; The left and right limit ports are used to receive limit signals of the left and right movement travel of the height adjustment shaft.

2. A laser processing control device according to claim 1, characterized in that: The laser control functional circuit also includes: a digital isolation circuit; One end of the digital isolation circuit is connected to the PWM module, and the other end of the digital isolation circuit is connected to one end of the driving circuit.

3. A laser processing control device according to claim 1, characterized in that: Also includes: EtherCAT module; One end of the EtherCAT module is connected to the SPI module in the microcontroller, and the other end of the EtherCAT module is connected to the EtherCAT bus communication network through any IN network port.

4. A laser processing control device according to claim 3, characterized in that: The EtherCAT module also includes at least one OUT network port.

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