Multi-phase height-adjusting follow-up detection system and method for laser cutting

Abstract

The invention provides a multi-phase heightening follow-up detection system for laser cutting, and belongs to the technical field of laser cutting, the system realizes remarkable real-time performance improvement through a multi-phase sampling unit, can quickly respond to height change in the cutting process, and compared with a traditional single-channel detection mode, the detection efficiency is improved, and the detection cost is reduced. According to the scheme, the signal processing precision is improved. According to the parallel full-comparison denoising algorithm, the system has excellent anti-interference performance, and the processing speed is also improved. By applying the speed suppression method, the system can dynamically adjust the control parameters according to the cutting working condition, and the sudden change problem under the variable-speed cutting scene is effectively solved while the response speed is guaranteed. Through the combination of segmented calibration technologies, the system can adapt to the measurement requirements of different material characteristics and height intervals, and the adaptability of the system to different processing scenes is remarkably improved while the overall measurement precision is ensured.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and in particular to a multi-phase height adjustment follow-up detection system for laser cutting. Background Technology

[0002] In laser cutting, the distance between the nozzle and the workpiece is a key factor affecting cutting quality and equipment stability. Currently, mainstream height adjustment detection methods primarily employ single-channel sampling, which suffers from significant data processing delays, making it difficult to meet the real-time requirements of high-speed cutting. Electromagnetic noise interference in industrial environments can easily lead to measurement errors, and existing systems often exhibit control lag when cutting speed changes abruptly, as the filtering parameters remain fixed. Furthermore, traditional linear calibration methods cannot adapt to the nonlinear characteristics of different materials and different height ranges, resulting in insufficient measurement accuracy. Although existing technologies, such as some patents, use single-channel capacitance detection to achieve basic distance measurement, their real-time performance and anti-interference capabilities under high-dynamic conditions still fail to meet practical needs. Therefore, a multi-phase height adjustment servo detection system for laser cutting is urgently needed to solve the problems of existing technologies. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a multi-phase height adjustment follow-up detection system and method for laser cutting.

[0004] In a first aspect, embodiments of the present invention provide a multi-phase height-adjustment servo detection system for laser cutting, comprising:

[0005] Microcapacitance measurement module and multi-phase height adjustment control module; wherein:

[0006] The micro-capacitance measurement module is connected to the laser cutting head via a high-frequency coaxial cable and to the multi-phase height adjustment control module via a twisted pair cable. It is used to convert the position information of the laser cutting head nozzle and the surface of the workpiece into capacitance frequency values.

[0007] The multi-phase height adjustment control module is electrically connected to the micro-capacitance measurement module. It is used to collect the capacitance frequency value, process the capacitance frequency value, convert the processed frequency value into a board spacing height value, and output the height value.

[0008] Furthermore, the micro-capacitance measurement module includes a capacitance signal sensing circuit, a feature signal selection amplification circuit, a small signal power enhancement circuit, and a signal isolation output circuit. The capacitance signal is constructed using a switching transistor with a characteristic frequency of 300MHz, and the oscillation signal frequency changes with the capacitance of the sensing capacitor through a three-point oscillator with series capacitors. The output signal of the capacitance signal sensing circuit is coupled to the feature signal selection amplification circuit via a capacitor.

[0009] Furthermore, the multi-phase height adjustment control module includes a multi-phase sampling unit, a signal processing unit, and a height conversion unit; wherein the multi-phase sampling unit is configured with four parallel sampling channels, each channel alternately acquiring frequency signals with a fixed phase difference; the signal processing unit synchronously compares multiple sampling window data through a parallel full comparison denoising algorithm, eliminates interference based on a dynamic threshold, and dynamically adjusts parameters according to the real-time cutting speed to implement speed suppression; the height conversion unit converts the processed frequency value into a board spacing height value based on the segmented stored calibration fitting coefficients, and finally outputs it to the servo driver through the servo drive interface.

[0010] Furthermore, the multi-phase sampling unit processes the periodic signal output by the micro-capacitance measurement module into a pulse signal through a zero-detection circuit, and inputs the pulse signal to the parallel input pin of the four sampling channels of the programmable system-on-a-chip to acquire the frequency value under a multi-phase clock. The multi-phase sampling unit is also used to coordinate the sampling timing of each phase channel and eliminate clock offset between multiple channels.

[0011] Furthermore, the signal processing unit synchronously compares multiple sampling window data through a parallel full comparison denoising algorithm. The specific method includes: synchronously acquiring four-channel phase difference frequency data, performing three-stage pipeline sorting on the four-channel data, taking the median filter output, and taking the arithmetic mean of the two middle data after sorting as the effective signal; when the difference between the maximum value and the minimum value exceeds the dynamic threshold, the sampling point is removed and interpolation compensation is enabled.

[0012] Furthermore, the signal processing unit dynamically adjusts parameters to implement speed suppression based on the real-time cutting speed. The specific method includes: pre-establishing a segmented mapping relationship table between the cutting speed range and the suppression coefficient on the controller, dividing the cutting speed into three ranges, each corresponding to a different suppression coefficient; monitoring the speed change of the cutting head in real time, and when the speed exceeds a preset threshold, immediately calling the corresponding suppression coefficient according to the current speed range, and adjusting the movement speed of the cutting head in real time according to the suppression parameters through the servo control loop, so that it dynamically converges to the target speed range.

[0013] Furthermore, the height conversion unit adopts piecewise linear calibration. After a calibration request signal is given, the height conversion unit executes the calibration process, controls the servo motor to drive the cutting head to move within a given range with a set step, divides the measurement range into multiple intervals, stores the fitting coefficients of each interval independently, and automatically selects the coefficients of the corresponding interval according to the current height.

[0014] Secondly, this invention discloses a multi-phase height-adjustment servo detection method for laser cutting, comprising:

[0015] The positional information of the laser cutting head nozzle relative to the surface of the workpiece is converted into a capacitance frequency value.

[0016] Four parallel sampling channels are configured, and each channel alternately acquires frequency signals with a fixed phase difference;

[0017] Multiple sampling window data are compared synchronously using a parallel full comparison denoising algorithm. Interference is eliminated based on a dynamic threshold, and speed suppression is implemented by dynamically adjusting parameters according to the real-time cutting speed.

[0018] The calibration fitting coefficients based on segmented storage convert the processed frequency values ​​into board pitch height values, which are then output to the servo driver via the servo drive interface.

[0019] Thirdly, the present invention also discloses an electronic device, characterized in that it comprises:

[0020] One or more processors;

[0021] Memory, used to store one or more programs;

[0022] When the one or more programs are executed by the one or more processors, the one or more processors implement the detection method.

[0023] Fourthly, the present invention also discloses a computer-readable medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps in the method.

[0024] This invention discloses a multi-phase height-adjustment follow-up detection system for laser cutting. Through a multi-phase sampling unit, the system achieves a significant improvement in real-time performance, enabling rapid response to height changes during the cutting process. Compared to traditional single-channel detection methods, this solution improves signal processing accuracy. The parallel full-comparison denoising algorithm of this invention gives the system excellent anti-interference performance and also improves processing speed. The application of the speed suppression method of this invention allows the system to dynamically adjust control parameters according to the cutting conditions, effectively overcoming the abrupt changes in variable-speed cutting scenarios while ensuring response speed. The combination of the segmented calibration technology of this invention enables the system to adapt to the measurement requirements of different material properties and height ranges, significantly improving the system's adaptability to different processing scenarios while ensuring overall measurement accuracy. Attached Figure Description

[0025] Figure 1 A structural block diagram of a multi-phase height-adjustment servo detection system for laser cutting is provided in an embodiment of the present invention;

[0026] Figure 2 A hardware structure block diagram of the microcapacitance measurement module provided in an embodiment of the present invention;

[0027] Figure 3 This is a structural block diagram of the height adjustment processing module provided in an embodiment of the present invention;

[0028] Figure 4 A flowchart of a multi-phase height adjustment follow-up detection method for laser cutting is provided in an embodiment of the present invention;

[0029] Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0031] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0032] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0033] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0034] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0035] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0036] To address at least one of the technical problems existing in the aforementioned related technologies, the present invention provides a multi-phase height adjustment follow-up detection system and method for laser cutting.

[0037] This embodiment discloses a multi-phase height-adjusting servo detection system for laser cutting, such as Figure 1 ,include:

[0038] Microcapacitance measurement module and multi-phase height adjustment control module; wherein:

[0039] The micro-capacitance measurement module is connected to the laser cutting head via a high-frequency coaxial cable and to the multi-phase height adjustment control module via a twisted pair cable. It is used to convert the position information of the laser cutting head nozzle and the surface of the workpiece into capacitance frequency values.

[0040] In this embodiment, the micro-capacitance measurement module includes a capacitance signal sensing circuit, a feature signal selection amplification circuit, a small-signal power enhancement circuit, and a signal isolation output circuit. The capacitance signal is constructed using a switching transistor with a characteristic frequency of 300MHz, and the oscillation signal frequency changes with the capacitance of the sensing capacitor through a three-point oscillator with series capacitors. The output signal of the capacitance signal sensing circuit is capacitively coupled to the feature signal selection amplification circuit. The feature signal selection amplification circuit amplifies the output signal and sends the amplified signal to the small-signal power enhancement circuit. The small-signal power enhancement circuit further amplifies the power of the amplified signal and sends the amplified signal to the signal isolation output circuit. The signal isolation output circuit isolates and outputs the amplified signal.

[0041] Specifically, such as Figure 2 The micro-capacitance measurement module includes a signal acquisition circuit, an operational amplifier follower circuit, a signal amplification circuit, and an isolation circuit. The signal acquisition circuit is constructed using a switching transistor with a characteristic frequency of 300MHz. It achieves the conversion function of the change in induced capacitance versus the change in oscillation signal frequency through a three-point oscillator with a series capacitor. Its output signal is capacitively coupled to the subsequent amplification circuit.

[0042] The multi-phase height adjustment control module is electrically connected to the micro-capacitance measurement module. It is used to collect the capacitance frequency value, process the capacitance frequency value, convert the processed frequency value into a board spacing height value, and output the height value.

[0043] In this embodiment, the multi-phase height adjustment control module includes a multi-phase sampling unit, a signal processing unit, and a height conversion unit. The multi-phase sampling unit is configured with four parallel sampling channels, each channel alternately acquiring frequency signals with a fixed phase difference. The signal processing unit synchronously compares multiple sampling window data using a parallel full comparison denoising algorithm, eliminates interference based on a dynamic threshold, and dynamically adjusts parameters according to the real-time cutting speed to implement speed suppression. The height conversion unit converts the processed frequency value into a board spacing height value based on the segmented stored calibration fitting coefficients, and finally outputs it to the servo driver through the servo drive interface.

[0044] In some preferred embodiments, the multi-phase sampling unit processes the periodic signal output by the micro-capacitance measurement module into a pulse signal through a zero-detection circuit, and inputs the pulse signal to the parallel input pin of the four sampling channels of the programmable system-on-a-chip to complete the frequency value acquisition under multi-phase clock. The multi-phase sampling unit is also used to coordinate the sampling timing of each phase channel and eliminate clock offset between multiple channels.

[0045] In some preferred embodiments, the signal processing unit synchronously compares multiple sampling window data using a parallel full comparison denoising algorithm. The specific method includes: synchronously acquiring four-channel phase difference frequency data, performing three-stage pipeline sorting on the four-channel data, taking the median filter output, and taking the arithmetic mean of the two middle data after sorting as the effective signal; when the difference between the maximum and minimum values ​​exceeds the dynamic threshold, the sampling point is removed and interpolation compensation is enabled.

[0046] In some preferred embodiments, the signal processing unit dynamically adjusts parameters to implement speed suppression based on the real-time cutting speed. The specific method includes: pre-establishing a segmented mapping relationship table between the cutting speed range and the suppression coefficient on the controller, dividing the cutting speed into three ranges, each corresponding to a different suppression coefficient; monitoring the speed change of the cutting head in real time, and when the speed exceeds a preset threshold, immediately calling the corresponding suppression coefficient according to the current speed range, and adjusting the movement speed of the cutting head in real time according to the suppression parameters through the servo control loop, so that it dynamically converges to the target speed range.

[0047] In some preferred embodiments, the height conversion unit adopts piecewise linear calibration. After a calibration request signal is given, the height conversion unit performs the calibration process, controls the servo motor to drive the cutting head to move within a given range with a set step, divides the measurement range into multiple intervals, stores the fitting coefficients of each interval independently, and automatically selects the coefficients of the corresponding interval according to the current height.

[0048] To better understand this embodiment, this embodiment also discloses a structural block diagram of the height adjustment processing module for a multi-phase height adjustment follow-up detection system for laser cutting, such as... Figure 3 As shown.

[0049] Figure 3 The multi-phase sampling unit is implemented at the PL terminal of the programmable system-on-a-chip and adopts a four-channel time-interleaved architecture. The periodic signal output from the amplifier is processed into a stable pulse signal with strong driving capability through a zero-detection circuit. This pulse signal is then input to the four sampling channels via pin assignments: Channel 0 corresponds to B34_L23_P, Channel 1 to B34_L23_N, Channel 2 to B34_L19_P, and Channel 3 to B34_L19_N. Each channel is equipped with a 33Ω termination resistor to ensure signal integrity. The clock system uses an MMCM module to generate four sets of sampling clocks with a precise 90° phase difference. The base frequency is 50MHz, and 400MHz clock signals of 0°, 90°, 180°, and 270° are generated through frequency multiplication and phase shift. These signals are distributed to each sampling channel via a BUFG clock buffer and phase alignment is achieved with the IDELAYE2 unit. The four sampled data are buffered by a dedicated asynchronous FIFO and processed in real time, resulting in an effective sampling rate that is four times higher than that of a single channel.

[0050] After acquiring the frequency data, it is sent to the parallel full-comparison denoising module in the signal processing unit. This module uses a 200MHz operating clock to achieve real-time processing of the four-channel frequency data. When the data update flag is high, the four-channel data completes cross-clock domain synchronization through a double-buffering mechanism and then enters a three-stage pipeline sorting network. The first stage compares Ch0 / Ch1 and Ch2 / Ch3 in parallel. The second stage cross-compares Ch0 / Ch2 and Ch1 / Ch3. The third stage finally compares Ch1 / Ch2. Each comparator uses combinational logic to implement value exchange. The sorted data is output as the arithmetic mean of the two middle channels. At the same time, the sliding window statistics module maintains 64 historical data points, calculates the mean μ and variance σ in real time, and generates a dynamic threshold. When the deviation between the current data and the median value exceeds the threshold, linear interpolation compensation of adjacent valid data is automatically enabled.

[0051] After processing the frequency values, it is necessary to establish the relationship between the measured values ​​and the physical positions. This system uses a height conversion unit to complete piecewise linear calibration. First, the control unit IPC master station will issue a calibration request signal, and this module will execute the calibration process. It first lowers its head to a position with a distance of 0 from the workpiece surface, and then raises it to a position with a distance of 10mm. It controls the servo motor to drive the cutting head to move within the set step range of 0-10mm. At each calibration point, the capacitance frequency value is collected synchronously. The coefficients (a, b) of the linear equation for K intervals are generated in real time by least squares fitting. The calibration data is stored in a dedicated memory area to form a dynamic calibration mapping table, where each interval contains coefficient values ​​and boundary frequency thresholds. When the system is running, the PS end automatically selects the coefficients of the corresponding interval from the frequency value transmitted from the PL end to complete the height conversion.

[0052] This system employs a speed suppression method based on dynamic adjustment of cutting speed. After multi-phase sampling data is transmitted to the PS terminal of the programmable system-on-a-chip (SoC) via the AXI bus, a real-time suppression algorithm is executed by the dual-core Cortex-A9 processor. A graded dynamic speed suppression strategy is used; when the real-time cutting speed exceeds a preset threshold, the system automatically suppresses the current speed to a preset safe value. Specifically, a speed-suppression value mapping table is established at the PS terminal, dividing the cutting speed into three intervals (0-17 m / min, 18-24 m / min, >24 m / min), and suppression coefficients k1, k2, and k3 are set accordingly. When an instantaneous speed exceeds the upper limit threshold of the current interval, the control algorithm immediately initiates the suppression program, reducing the speed to the preset value corresponding to that interval.

[0053] This system uses an EtherCAT communication module to achieve high-speed data interaction between the height controller (slave station) and the laser cutting master station IPC. A real-time communication link is built through the ESC control chip. The height controller acts as a slave to transmit height values, while the IPC acts as a master to transmit request signals and real-time calibration signals to the slave through this module. When the slave receives the corresponding signals, it will output alarm signals and real-time height values ​​when the set conditions are met.

[0054] This embodiment discloses a multi-phase height adjustment follow-up detection system for laser cutting. Through a multi-phase sampling unit, the system achieves a significant improvement in real-time performance, enabling rapid response to height changes during the cutting process. Compared to traditional single-channel detection methods, this solution improves signal processing accuracy. The parallel full-comparison denoising algorithm of this invention gives the system excellent anti-interference performance and also improves processing speed. The application of the speed suppression method of this invention allows the system to dynamically adjust control parameters according to the cutting conditions, effectively overcoming the abrupt changes in variable-speed cutting scenarios while ensuring response speed. The combination of the segmented calibration technology of this invention enables the system to adapt to the measurement requirements of different material properties and height ranges, significantly improving the system's adaptability to different processing scenarios while ensuring overall measurement accuracy.

[0055] Based on the same inventive concept, embodiments of the present invention also provide a multi-phase height-adjustment servo detection method for laser cutting, such as... Figure 4 ,include:

[0056] The positional information of the laser cutting head nozzle relative to the surface of the workpiece is converted into a capacitance frequency value.

[0057] Four parallel sampling channels are configured, and each channel alternately acquires frequency signals with a fixed phase difference;

[0058] Multiple sampling window data are compared synchronously using a parallel full comparison denoising algorithm. Interference is eliminated based on a dynamic threshold, and speed suppression is implemented by dynamically adjusting parameters according to the real-time cutting speed.

[0059] The calibration fitting coefficients based on segmented storage convert the processed frequency values ​​into board pitch height values, which are then output to the servo driver via the servo drive interface.

[0060] The specific working method of the height adjustment follow-up detection method has been described in detail in the height adjustment follow-up detection system, and will not be repeated here in this embodiment.

[0061] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 5 As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the methods described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0062] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0063] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0064] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0065] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the methods described in the above embodiments. The computer-readable storage medium may be a volatile or non-volatile computer-readable storage medium.

[0066] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code, wherein when the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described method.

[0067] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0068] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0069] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0070] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0071] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0072] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0073] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0074] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0075] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0076] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A multi-phase height-adjusting servo detection system for laser cutting, characterized in that, include: Microcapacitance measurement module and multi-phase height adjustment control module; wherein: The micro-capacitance measurement module is connected to the laser cutting head via a high-frequency coaxial cable and to the multi-phase height adjustment control module via a twisted pair cable. It is used to convert the position information of the laser cutting head nozzle and the surface of the workpiece into capacitance frequency values. The multi-phase height adjustment control module is electrically connected to the micro-capacitance measurement module. It is used to collect the capacitance frequency value, process the capacitance frequency value, convert the processed frequency value into a board spacing height value, and output the height value.

2. The detection system according to claim 1, characterized in that, The micro-capacitance measurement module includes a capacitance signal sensing circuit, a feature signal selection amplification circuit, a small signal power enhancement circuit, and a signal isolation output circuit. The capacitance signal is constructed using a switching transistor with a characteristic frequency of 300MHz. The oscillation signal frequency changes with the capacitance of the sensing capacitor through a three-point oscillator with series capacitors. The output signal of the capacitance signal sensing circuit is coupled to the feature signal selection amplification circuit via a capacitor.

3. The detection system according to claim 1, characterized in that, The multi-phase height control module includes a multi-phase sampling unit, a signal processing unit, and a height conversion unit. The multi-phase sampling unit is configured with four parallel sampling channels, each channel alternately acquiring frequency signals with a fixed phase difference. The signal processing unit synchronously compares multiple sampling window data through a parallel full comparison denoising algorithm, eliminates interference based on a dynamic threshold, and dynamically adjusts parameters according to the real-time cutting speed to implement speed suppression. The height conversion unit converts the processed frequency value into a board spacing height value based on the segmented stored calibration fitting coefficients, and finally outputs it to the servo driver through the servo drive interface.

4. The detection system according to claim 3, characterized in that, The multi-phase sampling unit processes the periodic signal output by the micro-capacitance measurement module into a pulse signal through a zero-detection circuit, and inputs the pulse signal to the parallel input pin of the four sampling channels of the programmable system-on-a-chip to acquire the frequency value under a multi-phase clock. The multi-phase sampling unit is also used to coordinate the sampling timing of each phase channel and eliminate clock offset between multiple channels.

5. The detection system according to claim 3, characterized in that, The signal processing unit synchronously compares multiple sampling window data through a parallel full comparison denoising algorithm. The specific method includes: synchronously acquiring four-channel phase difference frequency data, performing three-stage pipeline sorting on the four-channel data, taking the median filter output, and taking the arithmetic mean of the two middle data after sorting as the effective signal; when the difference between the maximum value and the minimum value exceeds the dynamic threshold, the sampling point is removed and interpolation compensation is enabled.

6. The detection system according to claim 3, characterized in that, The signal processing unit dynamically adjusts parameters to suppress speed based on the real-time cutting speed. The specific method includes: pre-establishing a segmented mapping relationship table between the cutting speed range and the suppression coefficient on the controller, dividing the cutting speed into three ranges, each corresponding to a different suppression coefficient; monitoring the speed change of the cutting head in real time, and when the speed exceeds a preset threshold, immediately calling the corresponding suppression coefficient according to the current speed range, and adjusting the movement speed of the cutting head in real time according to the suppression parameters through the servo control loop, so that it dynamically converges to the target speed range.

7. The detection system according to claim 3, characterized in that, The height conversion unit adopts piecewise linear calibration. After a calibration request signal is given, the height conversion unit executes the calibration process, controls the servo motor to drive the cutting head to move within a given range with a set step, divides the measurement range into multiple intervals, stores the fitting coefficients of each interval independently, and automatically selects the coefficients of the corresponding interval according to the current height.

8. A multi-phase height adjustment follow-up detection method for laser cutting, applied to any of the systems in claims 1-7, characterized in that, include: The positional information of the laser cutting head nozzle relative to the surface of the workpiece is converted into a capacitance frequency value. Four parallel sampling channels are configured, and each channel alternately acquires frequency signals with a fixed phase difference; Multiple sampling window data are compared synchronously using a parallel full comparison denoising algorithm. Interference is eliminated based on a dynamic threshold, and speed suppression is implemented by dynamically adjusting parameters according to the real-time cutting speed. The calibration fitting coefficients based on segmented storage convert the processed frequency values ​​into board pitch height values, which are then output to the servo driver via the servo drive interface.

9. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in claim 8.

10. A computer-readable medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method as described in claim 8.

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