Focusing method and system of laser engraving machine

Abstract

The invention discloses a focusing method and system for a laser engraving machine, and the method comprises the steps: lifting a laser in the laser engraving machine to the highest position before the laser engraving machine engraves a to-be-engraved part; the laser rapidly descends from the highest position and acquires an in-place signal; according to the laser engraving machine, local investigation is conducted on the basis of the position of the in-place signal so as to determine the focus position, at the moment, before the laser engraving machine engraves the to-be-engraved part, focusing of the laser is triggered, the laser ascends to the highest position and rapidly descends from the highest position, and therefore initial position investigation is conducted; according to the invention, local investigation is carried out based on the position of the in-place signal, the second position investigation is realized, and the fineness of the local investigation is improved, so that the focus position is conveniently determined in the local investigation, the accuracy of the focus position is ensured, and rapid focusing and accurate focusing of the laser engraving machine are realized.

Description

Technical Field

[0001] The invention relates to the technical field of laser engraving machines, and in particular to a focusing method and system of a laser engraving machine. Background Art

[0002] With the development of science and technology, laser engraving machines are used as a kind of engraving machines in people's lives or industrial fields. Laser engraving machines use laser output by lasers to engrave the workpieces to be engraved. Before the laser engraving machine engraves the workpieces to be engraved, the laser needs to be focused. In the prior art, the laser rises and falls in the up and down directions and is adjusted manually. At this time, the laser drops rapidly under human action and receives an in-place signal so that the position of the in-place signal is used as the focal position. However, the focal position is affected by the rapid drop of the laser and the signal delay, and is not the real focal position, which affects the accuracy of the focal position. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a focusing method and system for a laser engraving machine. Before the laser engraving machine engraves a workpiece to be engraved, the focus of the laser is triggered, the laser rises to the highest point, and then quickly descends from the highest point, thereby performing an initial position check. Further, a local check is performed based on the position of the in-position signal to achieve a second position check, and the precision of the local check is improved, so as to determine the focal position in the local check, ensure the accuracy of the focal position, and achieve rapid and precise focusing of the laser engraving machine.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a focusing method of a laser engraving machine, which is applied to the engraving scene of the laser engraving machine; the focusing method of the laser engraving machine includes: Before the laser engraving machine engraves the workpiece, raise the laser in the laser engraving machine to the highest position; The laser descends rapidly from the highest point and collects the in-position signal; Perform a local check based on the location of the in-place signal to determine the focus position.

[0005] Optionally, before the laser engraving machine engraves the workpiece to be engraved, raising the laser in the laser engraving machine to the highest position includes: Before the laser engraving machine engraves the workpiece to be engraved, the current position of the laser in the laser engraving machine is collected; If the current position of the laser is not the highest point, the laser will be triggered to rise; During the rising process of the laser, the laser gradually rises at a variable speed until it reaches the highest point.

[0006] Optionally, before the laser engraving machine engraves the workpiece to be engraved, raising the laser in the laser engraving machine to the highest position includes: Collect the distance between the current position and the highest point of the laser; Define the laser's rising parameters according to the distance between the laser's current position and the highest point; The model corresponding to the acquisition laser; Define model parameters based on the model corresponding to the laser, and associate the model parameters with the rise parameters; The corresponding speed change logic is matched according to the model parameter and the rising parameter, and the speed change state of the laser is triggered based on the speed change logic.

[0007] Optionally, before the laser engraving machine engraves the workpiece to be engraved, raising the laser in the laser engraving machine to the highest position includes: Record the rising process of the laser in real time and collect signals; If the signal is a rising limit in place signal, the trigger laser is adjusted from the rising state to the stopping state; If the signal is a non-rising limit in place signal, the laser is triggered to rise at a uniform speed at the current rising speed.

[0008] Optionally, the laser rapidly descends from the highest point and collects a position signal, including: When the laser is at the highest point, the laser's autofocus logic is triggered; In the laser's autofocus logic, the laser rapidly descends from the highest point, wherein the laser's descending speed is higher than the laser's ascending speed; Monitor the rapid descent of the laser and collect the arrival signal; Record the position of the position signal.

[0009] Optionally, the laser rapidly descends from the highest point and collects a position signal, further comprising: Collect the surface to be engraved of the workpiece to be engraved, and define the height of the surface to be engraved of the workpiece to be engraved; Determine the height difference based on the height of the surface to be engraved of the engraved piece and the height of the highest point; Predict the theoretical position based on the height difference and the model of the laser; Define the laser descent speed according to the theoretical position, the highest point and the laser model; If the laser cannot collect an in-position signal at the theoretical in-position, it will perform phased reciprocating movements based on the theoretical in-position until the laser collects an in-position signal.

[0010] Optionally, the performing a local check based on the position of the in-position signal to determine the focus position includes: Collect the arrival signal and define the location of the arrival signal; Local inspection based on the location of the in-place signal triggering the laser; In the local inspection of the laser, the laser is raised and lowered back and forth at the position of the in-position signal, and the focusing status of the laser is monitored; If the focus state of the laser is in the preset focus state, the current position of the laser is frozen and defined as the focus position.

[0011] Optionally, the local investigation based on the position of the arrival signal to determine the focus position also includes: if the laser is in the local investigation process, collecting the moving speed of the laser; the moving speed of the laser is less than the descending speed of the laser.

[0012] Optionally, the focusing method of the laser engraving machine further includes: The laser descends rapidly from the highest point; Monitor the descent process of the laser until it reaches the lowest point; When the laser moves from the highest point to the lowest point, the in-position signal cannot be collected, and the number of times the laser cannot be detected is recorded; If the number of times the laser cannot be detected exceeds the preset number, the laser fault detection is triggered.

[0013] Optionally, the focusing system of the laser engraving machine is applied to the focusing method of the laser engraving machine mentioned above, and the focusing system of the laser engraving machine includes: The lifting module is used to lift the laser in the laser engraving machine to the highest position before the laser engraving machine engraves the workpiece to be engraved; The acquisition module is used to quickly descend the laser from the highest point and collect the arrival signal; The local inspection module is used to perform a local inspection based on the location of the in-place signal to determine the focus position.

[0014] In an embodiment of the present invention, by the method in the embodiment of the present invention, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point; the laser is rapidly lowered from the highest point, and an in-position signal is collected; a local check is performed based on the position of the in-position signal to determine the focal position. At this time, before the laser engraving machine engraves the workpiece to be engraved, the focus of the laser is triggered, the laser is raised to the highest point, and rapidly lowered from the highest point, thereby performing an initial position check. Furthermore, a local check is performed based on the position of the in-position signal to achieve a second position check, and the precision of the local check is improved, so as to determine the focal position in the local check, ensure the accuracy of the focal position, and achieve rapid focusing and precise focusing of the laser engraving machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a schematic flow chart of a focusing method of a laser engraving machine in an embodiment of the present invention; Figure 2 is a flow chart of S11 in the focusing method of the laser engraving machine in the embodiment of the present invention; Figure 3 is a schematic flow chart of S12 in the focusing method of the laser engraving machine in the embodiment of the present invention; Figure 4 is a schematic flow chart of S13 in the focusing method of the laser engraving machine in the embodiment of the present invention; Figure 5 Schematic diagram of the structure of the focusing system of the laser engraving machine in the embodiment of the present invention; Figure 6 The figure is a hardware diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example See also Figures 1 to 6 , a focusing method of a laser engraving machine, applied to the engraving scene of the laser engraving machine; the focusing method of the laser engraving machine comprises: Step S11: before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point; Step S12: the laser is rapidly lowered from the highest point and a position signal is collected; Step S13: Perform a local check based on the location of the in-position signal to determine the focus position.

[0019] In an embodiment of the present invention, by the method in the embodiment of the present invention, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point; the laser is rapidly lowered from the highest point, and an in-position signal is collected; a local check is performed based on the position of the in-position signal to determine the focal position. At this time, before the laser engraving machine engraves the workpiece to be engraved, the focus of the laser is triggered, the laser is raised to the highest point, and rapidly lowered from the highest point, thereby performing an initial position check. Furthermore, a local check is performed based on the position of the in-position signal to achieve a second position check, and the precision of the local check is improved, so as to determine the focal position in the local check, ensure the accuracy of the focal position, and achieve rapid focusing and precise focusing of the laser engraving machine.

[0020] See also Figure 2 In step S11, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point; In the specific implementation process of the present invention, the specific steps may be: S111: before the laser engraving machine engraves the workpiece to be engraved, the current position of the laser in the laser engraving machine is collected; S112: If the current position of the laser is not the highest point, trigger the laser to rise; S113: During the rising process of the laser, the laser gradually rises in a variable speed state until it reaches the highest point.

[0021] In an embodiment of the present invention, before the laser engraving machine engraves the workpiece to be engraved, it is necessary to focus the laser of the laser engraving machine. At this time, the current position of the laser in the laser engraving machine is collected, and the current position of the laser is compared with the highest point. If the current position of the laser is not the highest point, the rise of the laser is triggered so that the laser rises from the current position to the highest point, thereby realizing gradual focusing at the highest point, avoiding omissions, and being compatible with various focusing environments.

[0022] Therefore, during the rising process of the laser, the laser gradually rises in a variable speed state until it reaches the highest point. At this time, in the stage of rising from the current position to the highest point, the laser gradually rises in a variable speed state and reaches the highest point with the fastest efficiency, ensuring the efficiency before focusing. At the same time, it stops at the highest point to trigger the laser's descending focus.

[0023] Furthermore, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point, and also includes: collecting the distance between the current position of the laser and the highest point; defining the rising parameter of the laser according to the distance between the current position of the laser and the highest point; collecting the model corresponding to the laser; defining the model parameter based on the model corresponding to the laser, and associating the model parameter with the rising parameter; matching the corresponding speed change logic according to the model parameter and the rising parameter, and triggering the speed change state of the laser based on the speed change logic.

[0024] At this time, the distance between the current position of the laser and the highest point is introduced, and the rising parameter of the laser is defined by the distance between the current position of the laser and the highest point, so as to associate the rising parameter with the model corresponding to the laser, so as to match the corresponding speed change logic in combination with the rising parameter and the model corresponding to the laser, so as to control the speed rise of the laser through the speed change logic, realize customized control of the rise of the laser, and trigger the speed change state of the laser based on the speed change logic.

[0025] In addition, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point, and the method also includes: recording the rising process of the laser in real time and collecting signals; if the signal is a rising limit in place signal, the laser is triggered to adjust from a rising state to a stopped state; if the signal is a non-rising limit in place signal, the laser is triggered to rise at a uniform speed at the current rising speed.

[0026] The rising process of the laser is recorded in real time to monitor the rising process of the laser. At the same time, the signal is collected during the variable speed rising process to control the rising limit in place signal, so as to trigger the laser from the rising state to the stopping state according to the rising limit in place signal, and stop at the highest point. In addition, if the signal is not a rising limit in place signal, the laser is triggered to rise at a uniform speed at the current rising speed.

[0027] See also Figure 3 , in step S12, the laser descends rapidly from the highest point and collects the in-position signal; In the specific implementation process of the present invention, the specific steps may be: S121: When the laser is at the highest point, trigger the laser's auto-focus logic; S122: In the automatic focusing logic of the laser, the laser rapidly descends from the highest point, wherein the descending speed of the laser is higher than the ascending speed of the laser; S123: monitor the rapid descent of the laser and collect the arrival signal; S124: Record the position of the in-position signal.

[0028] In an embodiment of the present application, when the laser is at the highest point, the laser's autofocus logic is triggered so that the laser's autofocus is gradually realized through the laser's autofocus logic. At this time, in the laser's autofocus logic, the laser rapidly descends from the highest point, wherein the laser's descending speed is higher than the laser's ascending speed. Since it is the first descent, precise positioning is not performed, so a rapid descent is used in the first descent to improve the laser's precise focusing efficiency. At this time, the rapid descent of the laser is monitored, and the in-position signal is collected; the position of the in-position signal is recorded, which is not the final focus position.

[0029] Furthermore, the laser descends rapidly from the highest point and collects an in-position signal, and also includes: collecting the surface to be engraved of the workpiece to be engraved and defining the height of the surface to be engraved of the workpiece to be engraved; determining the height difference based on the height of the surface to be engraved of the workpiece to be engraved and the height of the highest point; predicting the theoretical in-position position according to the height difference and the model of the laser; defining the descent speed of the laser according to the theoretical in-position position, the height of the highest point and the model of the laser; if the laser cannot collect an in-position signal at the theoretical in-position, performing phased reciprocating movements based on the theoretical in-position until the laser collects an in-position signal.

[0030] See also Figure 4 , S13: Perform local inspection based on the location of the in-place signal to determine the focus position; In the specific implementation process of the present invention, the specific steps may be: S131: Collect the arrival signal and define the location of the arrival signal; S132: triggering a local check of the laser based on the position of the arrival signal; S133: In the local inspection of the laser, the laser is lifted and lowered back and forth at the position where the in-position signal is located, and the focusing state of the laser is monitored; S134: If the focus state of the laser is in the preset focus state, freeze the current position of the laser and define the current position as the focus position.

[0031] In an embodiment of the present application, an arrival signal is collected and the location of the arrival signal is defined, so as to facilitate further control based on the location of the arrival signal, and perform local investigation with the location of the arrival signal as the center position, thereby performing a range investigation on the location of the arrival signal.

[0032] At this time, a local inspection of the laser is triggered based on the position of the in-place signal; in the local inspection of the laser, the laser is reciprocated and raised and lowered at the position of the in-place signal, and the focus state of the laser is monitored; if the focus state of the laser is in the preset focus state, the current position of the laser is frozen and defined as the focus position.

[0033] In addition, the local investigation based on the location of the in-place signal to determine the focal position also includes: if the laser is in the local investigation process, collecting the moving speed of the laser; the moving speed of the laser is less than the descending speed of the laser. At this time, a local investigation is performed on the location of the in-place signal, and a smaller moving speed is used in the local investigation, and the investigation is performed based on the upper and lower positions of the location of the in-place signal.

[0034] In addition, the focusing method of the laser engraving machine also includes: the laser is quickly lowered from the highest point; the descending process of the laser is monitored until the laser reaches the lowest point; in the process of the laser moving from the highest point to the lowest point, the position signal cannot be collected, and the number of times the laser cannot be detected is recorded; if the number of times the laser cannot be detected exceeds a preset number, the laser fault detection is triggered.

[0035] In an embodiment of the present application, before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest point; the laser is rapidly lowered from the highest point, and an in-position signal is collected; a local check is performed based on the position of the in-position signal to determine the focal position. At this time, the focus of the laser is triggered before the laser engraving machine engraves the workpiece to be engraved, the laser is raised to the highest point, and rapidly lowered from the highest point, thereby performing an initial position check. Furthermore, a local check is performed based on the position of the in-position signal to achieve a second position check, and the precision of the local check is improved, so that the focal position can be determined in the local check, the accuracy of the focal position is ensured, and the rapid focusing and precise focusing of the laser engraving machine are achieved.

[0036] Example See also Figure 5 , Figure 5 It is a schematic diagram of the structural composition of the focusing system of the laser engraving machine in the embodiment of the present invention.

[0037] like Figure 5 As shown, a focusing system of a laser engraving machine, the focusing system of the laser engraving machine comprises: A lifting module 21 is used to lift the laser in the laser engraving machine to the highest point before the laser engraving machine engraves the workpiece to be engraved; The acquisition module 22 is used for the laser to descend rapidly from the highest point and to acquire the arrival signal; The local checking module 23 is used to perform a local check based on the position of the in-position signal to determine the focus position.

[0038] Example See also Figure 6 , refer to the following Figure 6 The electronic device 40 according to this embodiment of the present invention will be described. Figure 6 The electronic device 40 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0039] like Figure 6 As shown, the electronic device 40 is in the form of a general computing device. The components of the electronic device 40 may include but are not limited to: at least one processing unit 41, at least one storage unit 42, and a bus 43 connecting different system components (including the storage unit 42 and the processing unit 41).

[0040] The storage unit stores program codes, which can be executed by the processing unit 41, so that the processing unit 41 executes the steps according to various exemplary embodiments of the present invention described in the above “Embodiment Method” section of this specification.

[0041] The storage unit 42 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache memory unit 422 , and may further include a read-only memory unit (ROM) 423 .

[0042] The storage unit 42 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0043] Bus 43 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0044] The electronic device 40 may also communicate with one or more external devices (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable a user to interact with the electronic device 40, and / or any device that enables the electronic device 40 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 44. Furthermore, the electronic device 40 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 45. Figure 6 As shown, the network adapter 45 communicates with other modules of the electronic device 40 via the bus 43. It should be understood that although Figure 6 Not shown, other hardware and / or software modules may be used in conjunction with the electronic device 40, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup planning systems.

[0045] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0046] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc. In addition, it stores computer program instructions, and when the computer program instructions are executed by a computer, the computer executes the above method.

[0047] In addition, the focusing method and system of the laser engraving machine provided by the embodiment of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A focusing method for a laser engraving machine, characterized in that: Applicable to the engraving scene of a laser engraving machine; the focusing method of the laser engraving machine includes: Before the laser engraving machine engraves the workpiece, raise the laser in the laser engraving machine to the highest position; The laser descends rapidly from the highest point and collects the in-position signal; Perform a local check based on the location of the in-place signal to determine the focus position.

2. The focusing method of the laser engraving machine according to claim 1, characterized in that: Before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest position, and further comprises: Before the laser engraving machine engraves the workpiece to be engraved, the current position of the laser in the laser engraving machine is collected; If the current position of the laser is not the highest point, the laser will be triggered to rise; During the rising process of the laser, the laser gradually rises at a variable speed until it reaches the highest point.

3. The focusing method of the laser engraving machine according to claim 2, characterized in that: Before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest position, and further comprises: Collect the distance between the current position and the highest point of the laser; Define the laser's rising parameters according to the distance between the laser's current position and the highest point; The model corresponding to the acquisition laser; Define model parameters based on the model corresponding to the laser, and associate the model parameters with the rise parameters; The corresponding speed change logic is matched according to the model parameter and the rising parameter, and the speed change state of the laser is triggered based on the speed change logic.

4. The focusing method of the laser engraving machine according to claim 2, characterized in that: Before the laser engraving machine engraves the workpiece to be engraved, the laser in the laser engraving machine is raised to the highest position, and further comprises: Record the rising process of the laser in real time and collect signals; If the signal is a rising limit in place signal, the trigger laser is adjusted from the rising state to the stopping state; If the signal is a non-rising limit in place signal, the laser is triggered to rise at a uniform speed at the current rising speed.

5. The focusing method of a laser engraving machine according to claim 1, characterized in that: The laser descends rapidly from the highest point and collects the in-position signal, including: When the laser is at the highest point, the laser's autofocus logic is triggered; In the laser's autofocus logic, the laser rapidly descends from the highest point, wherein the laser's descending speed is higher than the laser's ascending speed; Monitor the rapid descent of the laser and collect the arrival signal; Record the position where the position signal is located.

6. The focusing method of the laser engraving machine according to claim 5, characterized in that: The laser rapidly descends from the highest point and collects the in-position signal, and also includes: Collect the surface to be engraved of the workpiece to be engraved, and define the height of the surface to be engraved of the workpiece to be engraved; Determine the height difference based on the height of the surface to be engraved of the engraved piece and the height of the highest point; Predict the theoretical position based on the height difference and the model of the laser; Define the laser descent speed according to the theoretical position, the highest point and the laser model; If the laser cannot collect an in-position signal at the theoretical in-position, it will perform phased reciprocating movements based on the theoretical in-position until the laser collects an in-position signal.

7. The focusing method of a laser engraving machine according to claim 6, characterized in that: The local investigation based on the position of the in-position signal to determine the focus position includes: Collect the arrival signal and define the location of the arrival signal; Local inspection based on the location of the in-place signal triggering the laser; In the local inspection of the laser, the laser is raised and lowered back and forth at the position of the in-position signal, and the focusing status of the laser is monitored; If the focus state of the laser is in the preset focus state, the current position of the laser is frozen and defined as the focus position.

8. The focusing method of a laser engraving machine according to claim 7, characterized in that: The local inspection based on the position of the in-place signal to determine the focus position also includes: If the laser is in the process of local troubleshooting, collect the moving speed of the laser; the moving speed of the laser is less than the descending speed of the laser.

9. The focusing method of a laser engraving machine according to claim 1, characterized in that: The focusing method of the laser engraving machine also includes: The laser descends rapidly from the highest point; Monitor the descent process of the laser until it reaches the lowest point; When the laser moves from the highest point to the lowest point, the in-position signal cannot be collected, and the number of times the laser cannot be detected is recorded; If the number of times the laser cannot be detected exceeds the preset number, the laser fault detection is triggered.

10. A focusing system for a laser engraving machine, characterized in that: The focusing system of the laser engraving machine is applied to the focusing method of the laser engraving machine as claimed in any one of claims 1 to 9, and the focusing system of the laser engraving machine comprises: The lifting module is used to lift the laser in the laser engraving machine to the highest position before the laser engraving machine engraves the workpiece to be engraved; The acquisition module is used to quickly descend the laser from the highest point and collect the arrival signal; The local inspection module is used to perform a local inspection based on the location of the in-place signal to determine the focus position.

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