Multi-angle visual displacement laser marking machine

Abstract

The invention discloses a multi-angle visual displacement laser marking machine which comprises a machining environment adjusting mechanism, the machining environment adjusting mechanism comprises a light-transmitting machining box, a sealing door is arranged on the front face of the light-transmitting machining box, and a gas cylinder replacement door is arranged at the upper end of the light-transmitting machining box. The invention aims to solve the problems that in the prior art, mechanical vibration and deformation are easily caused by inertia force and centrifugal force during high-speed movement, a transmission part has a return clearance and elastic deformation, an empty switching error is caused by the clearance during reversing, transmission lag is caused by flexibility, and motor displacement and mechanical displacement are asynchronous. The multi-angle free adjustment parallel mechanism is arranged to replace a conventional multi-shaft series movement structure, the parallel mechanism is connected with the connecting plate and the mounting plate in parallel through the multiple supporting rods to form a symmetrical supporting structure, the overall rigidity is far higher than that of a series cantilever type structure, the deformation resistance is high during high-speed movement, and the vibration amplitude is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser marking, and particularly relates to a laser marking machine with multi-angle visual positioning and movement. Background Art

[0002] A laser marking machine uses a laser with a high energy density to locally irradiate the surface of a workpiece, causing the surface material to vaporize or change color, thereby leaving a permanent mark. This marking method has the advantages of high precision, high speed, and long-lasting effect, and has been widely used in many industries such as electronics, automotive, and medical devices.

[0003] Currently, for the multi-angle adjustment of a laser marking machine, it mostly relies on traditional multi-axis series motion mechanisms. During use, the series structure is connected in a cantilever chain form. As the number of axes increases, the overall stiffness significantly decreases. When moving at high speed, inertial forces and centrifugal forces are likely to cause mechanical vibrations and deformations. There are return clearances and elastic deformations in the transmission components, and the clearance during commutation leads to no-cut errors. Flexibility causes transmission lags, making the motor displacement out of sync with the mechanical displacement. Dynamic errors continuously accumulate with vibrations. At the same time, static errors such as manufacturing tolerances and installation deviations of each joint are gradually amplified to the end through geometric relationships. For example, angular errors are amplified to position errors by the link length. The error accumulation speed accelerates during high-speed movement, and adding dynamic vibration errors results in a significant decrease in the end accuracy, causing certain inconvenience in use. Summary of the Invention

[0004] Therefore, the present invention provides a laser marking machine with multi-angle visual positioning and movement to solve the above problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: According to the first aspect of the present invention, a laser marking machine with multi-angle visual positioning and movement includes a processing environment adjustment mechanism, which includes a light-transmitting processing box. A sealing door is provided on the front of the light-transmitting processing box, a gas cylinder replacement door is provided on the upper end of the light-transmitting processing box, and an inert gas cylinder is provided on the upper end of the light-transmitting processing box; a multi-angle workpiece fixing mechanism, which includes a fixing disk and a fixing block. The bottom of the fixing disk is fixedly connected to the bottom of the inner cavity of the light-transmitting processing box, the bottom of the fixing block is fixedly connected to the bottom of the inner cavity of the light-transmitting processing box, and a cylinder is fixedly connected inside the fixing block; a multi-angle free adjustment parallel mechanism, which includes a connecting plate. The top of the connecting plate is fixedly connected to the top of the inner cavity of the light-transmitting processing box, and a first motor is fixedly connected to the bottom of the connecting plate; a visual positioning laser marking mechanism, which includes a mounting plate. A connecting block is fixedly connected to the top of the mounting plate, and an image acquisition camera is provided inside the mounting plate.

[0006] Further, the processing environment adjusting mechanism further includes a connecting pipe, an electromagnetic valve is arranged inside the connecting pipe, an air outlet is arranged at one end of the connecting pipe close to the electromagnetic valve, the lower end of the air outlet is communicated with the inside of the light-transmitting processing box, and the end of the connecting pipe is connected with the air outlet of the inert gas cylinder.

[0007] Further, a control terminal is fixedly connected to the surface of the light-transmitting processing box, the control terminal is electrically connected to the electromagnetic valve, and the control terminal is electrically connected to the image acquisition camera.

[0008] Further, the multi-angle workpiece fixing mechanism further includes a driving block, the surface of the driving block is fixedly connected to the output end of the cylinder, the surface of the driving block is slidably connected to the inside of the fixed disk, and a guide rod is slidably connected to the inside of the driving block.

[0009] Further, one end of the guide rod is fixedly connected to a clamping plate, a rubber pad is fixedly connected to one side of the clamping plate, and a spring is fixedly connected to the side of the clamping plate away from the rubber pad.

[0010] Further, one end of the spring is fixedly connected to a pressure sensor, the pressure sensor is arranged inside the driving block, the pressure sensor is electrically connected to the control terminal, and a marking workpiece is lapped on one side of the rubber pad.

[0011] Further, the multi-angle free-adjustment parallel mechanism further includes a rotating member, the surface of the rotating member is fixedly connected to one end of the rotating shaft of the first motor, a second motor is fixedly connected to one side of the rotating member, one end of the rotating shaft of the second motor is fixedly connected to a first support rod, and one end of the first support rod is rotatably connected to a second support rod.

[0012] Further, a third motor is fixedly connected to the other side of the rotating member, one end of the rotating shaft of the third motor is fixedly connected to a third support rod, and one end of the third support rod is rotatably connected to a fourth support rod.

[0013] Further, one end of the fourth support rod is rotatably connected to the end of the second support rod through a rotating rod, one end of the fourth support rod is fixedly connected to a rotating sleeve, a connecting member is rotatably connected to the inside of the rotating sleeve, and the surface of the connecting member is rotatably connected to the inside of the connecting block.

[0014] Further, the vision positioning laser marking mechanism further includes a fixing member, a laser marker is fixedly connected to the inside of the fixing member, and the laser marker is signal-connected to the control terminal.

[0015] The present invention has the following advantages: By providing a multi-angle freely adjustable parallel mechanism to replace the conventional multi-axis series motion structure, the parallel mechanism is connected to the connecting plate and the mounting plate in parallel through multiple struts to form a symmetric support structure. The overall stiffness is much higher than that of the series cantilever structure, with strong anti-deformation ability during high-speed movement and significantly reduced vibration amplitude. At the same time, the driving component, the motor, is installed on the connecting plate. The mounting plate is light in mass and small in moment of inertia, weakening the influence of inertial force and centrifugal force and improving dynamic stability. Meanwhile, the errors of the series structure accumulate in a chain, and the end error is the geometric magnification of the errors of each joint. However, each branch chain of the parallel mechanism is independently driven, and the errors are synchronously corrected through closed-loop feedback. The influence of the clearance or deformation of a single branch chain on the end is evenly distributed, without significant error magnification effect. Compared with the series structure, the adjustment accuracy is significantly improved, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0017] Figure 2 FIG. is a schematic structural diagram of the open state of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0018] Figure 3 FIG. is a schematic structural diagram of the back of the open state of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0019] Figure 4 FIG. is a schematic bottom view structural diagram of the multi-angle freely adjustable parallel mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0020] Figure 5 FIG. is a schematic top view structural diagram of the multi-angle freely adjustable parallel mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0021] Figure 6 FIG. is a schematic structural diagram of the multi-angle freely adjustable parallel mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0022] Figure 7 FIG. is a schematic structural diagram of the multi-angle workpiece fixing mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0023] Figure 8 FIG. is a schematic bottom view structural diagram of the multi-angle workpiece fixing mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0024] Figure 9 FIG. is a schematic structural diagram of the multi-angle workpiece fixing mechanism of a laser marking machine with multi-angle visual positioning provided by the present invention.

[0025] Figure 10 Schematic diagram of the enlarged structure at position A in a Figure 2 laser marking machine with multi-angle visual movement provided by the present invention.

[0026] Figure 11 Schematic diagram of the structure at position B in a Figure 4 laser marking machine with multi-angle visual movement provided by the present invention.

[0027] In the figure: 11, light-transmitting processing box; 12, sealing door; 13, gas cylinder replacement door; 14, inert gas cylinder; 15, connecting pipe; 16, solenoid valve; 17, air outlet; 18, control terminal; 21, fixed disk; 22, fixed block; 23, cylinder; 24, driving block; 25, guide rod; 26, clamping plate; 27, rubber pad; 28, spring; 29, pressure sensor; 210, marked workpiece; 31, connecting plate; 32, first motor; 33, rotating part; 34, second motor; 35, first support rod; 36, second support rod; 37, third motor; 38, third support rod; 39, fourth support rod; 310, rotating sleeve; 311, connecting part; 41, mounting plate; 42, connecting block; 43, image acquisition camera; 44, fixing part; 45, laser marker. Specific embodiments

[0028] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0029] As Figures 1 to 11As shown in the figure, a laser marking machine with multi-angle visual movement in the first aspect embodiment of the present invention includes a processing environment adjustment mechanism. The processing environment adjustment mechanism includes a light-transmitting processing box 11. A sealing door 12 is arranged on the front of the light-transmitting processing box 11. A gas cylinder replacement door 13 is arranged at the upper end of the light-transmitting processing box 11. An inert gas cylinder 14 is arranged at the upper end of the light-transmitting processing box 11; a multi-angle workpiece fixing mechanism, the multi-angle workpiece fixing mechanism includes a fixing plate 21 and a fixing block 22. The bottom of the fixing plate 21 is fixedly connected to the bottom of the inner cavity of the light-transmitting processing box 11. The bottom of the fixing block 22 is fixedly connected to the bottom of the inner cavity of the light-transmitting processing box 11. A cylinder 23 is fixedly connected inside the fixing block 22; a multi-angle free adjustment parallel mechanism, the multi-angle free adjustment parallel mechanism includes a connecting plate 31. The top of the connecting plate 31 is fixedly connected to the top of the inner cavity of the light-transmitting processing box 11. A first motor 32 is fixedly connected to the bottom of the connecting plate 31; a visual positioning laser marking mechanism, the visual positioning laser marking mechanism includes a mounting plate 41. A connecting block 42 is fixedly connected to the top of the mounting plate 41. An image acquisition camera 43 is arranged inside the mounting plate 41; In the above embodiment, it should be noted that during use, the operator opens the sealing door 12 of the light-transmitting processing box 11, places the marking workpiece 210 on the fixing plate 21, and the control terminal 18 controls the cylinder 23 to work. The output end of the cylinder 23 pushes the driving block 24 to slide inside the fixing plate 21. The driving block 24 drives the guide rod 25 to move. The clamping plate 26 at one end of the guide rod 25 then approaches the marking workpiece 210. After the rubber pad 27 on the clamping plate 26 contacts the workpiece, the spring 28 is compressed. The pressure sensor 29 monitors the pressure change in real time and transmits the pressure signal to the control terminal 18. When the pressure reaches the preset value, the control terminal 18 controls the cylinder 23 to stop working. At this time, the workpiece is firmly and safely fixed in the appropriate position; The technical effect achieved by the above embodiment is that when the pressure reaches the preset value, the control terminal 18 controls the cylinder 23 to stop working, and the workpiece is firmly and safely fixed in the appropriate position. Embodiment

[0030] Such as Figures 1 to 11As shown in the figure, a laser marking machine with multi-angle visual movement includes all the contents of Embodiment 1. In addition, the processing environment adjustment mechanism further includes a connecting pipe 15. An electromagnetic valve 16 is arranged inside the connecting pipe 15. An air outlet 17 is arranged at one end of the connecting pipe 15 close to the electromagnetic valve 16. The lower end of the air outlet 17 is communicated with the inside of the light-transmitting processing box 11. The end of the connecting pipe 15 is connected to the air outlet of the inert gas cylinder 14. A control terminal 18 is fixedly connected to the surface of the light-transmitting processing box 11. The control terminal 18 is electrically connected to the electromagnetic valve 16. The control terminal 18 is electrically connected to the image acquisition camera 43. The multi-angle workpiece fixing mechanism further includes a driving block 24. The surface of the driving block 24 is fixedly connected to the output end of the air cylinder 23. The surface of the driving block 24 is slidably connected to the inside of the fixed disk 21. A guide rod 25 is slidably connected to the inside of the driving block 24. One end of the guide rod 25 is fixedly connected to a clamping plate 26. A rubber pad 27 is fixedly connected to one side of the clamping plate 26. A spring 28 is fixedly connected to the side of the clamping plate 26 away from the rubber pad 27; In the above embodiment, it should be noted that before starting the marking, the control terminal 18 controls the electromagnetic valve 16 to open according to the workpiece material and marking requirements. The inert gas in the inert gas cylinder 14 enters the light-transmitting processing box 11 through the connecting pipe 15 and the air outlet 17, discharging the air in the box and creating an inert gas protection environment to prevent the workpiece from oxidizing during the marking process. The control terminal 18 can adjust the opening degree and ventilation time of the electromagnetic valve 16 as needed to ensure that the processing environment meets the marking requirements. Subsequently, the image acquisition camera 43 performs image acquisition on the fixed workpiece and transmits the acquired image information to the control terminal 18. The control terminal 18 uses image processing algorithms to analyze the image, determine the position, shape, and area to be marked of the workpiece. According to the analysis results, the control terminal 18 calculates the position and angle that the laser marker 45 needs to reach. The control terminal 18 controls the multi-angle freely adjustable parallel mechanism to work according to the calculation results; The technical effect achieved by the above embodiment is: transmitting the acquired image information to the control terminal 18, and the control terminal 18 uses image processing algorithms to analyze the image, determine the position, shape, and area to be marked of the workpiece. According to the analysis results, the control terminal 18 calculates the position and angle that the laser marker 45 needs to reach. Embodiment

[0031] Such as Figures 1 to 11As shown in the figure, a laser marking machine with multi-angle visual movement includes all the contents of Embodiment 2. In addition, one end of a spring 28 is fixedly connected to a pressure sensor 29. The pressure sensor 29 is arranged inside a driving block 24 and is electrically connected to a control terminal 18. One side of a rubber pad 27 is lapped with a workpiece to be marked 210. The multi-angle free-adjustment parallel mechanism further includes a rotating member 33. The surface of the rotating member 33 is fixedly connected to one end of a rotating shaft of a first motor 32. One side of the rotating member 33 is fixedly connected to a second motor 34. One end of a rotating shaft of the second motor 34 is fixedly connected to a first support rod 35. One end of the first support rod 35 is rotatably connected to a second support rod 36. The other side of the rotating member 33 is fixedly connected to a third motor 37. One end of a rotating shaft of the third motor 37 is fixedly connected to a third support rod 38. One end of the third support rod 38 is rotatably connected to a fourth support rod 39. One end of the fourth support rod 39 is rotatably connected to an end of the second support rod 36. One end of the fourth support rod 39 is fixedly connected to a rotating sleeve 310. The inside of the rotating sleeve 310 is rotatably connected to a connecting member 311. The surface of the connecting member 311 is rotatably connected to the inside of a connecting block 42. The visual positioning laser marking mechanism further includes a fixing member 44. A laser marker 45 is fixedly connected to the inside of the fixing member 44. The laser marker 45 is in signal connection with the control terminal 18; In the above embodiment, it should be noted that the first motor 32 drives the rotating member 33 to rotate to adjust the overall angle direction. The second motor 34 and the third motor 37 respectively drive the first support rod 35 and the third support rod 38 to move. Through the rotational connection of the second support rod 36 and the fourth support rod 39, and the cooperation of the rotating sleeve 310 and the connecting member 311, the laser marker 45 is freely adjusted in multiple angles and directions, enabling it to quickly and accurately reach the marking position. After reaching the specified position, the control terminal 18 sends a marking signal to the laser marker 45. The laser marker 45 marks the workpiece according to the preset pattern and parameters. During the marking process, the image acquisition camera 43 continuously acquires images. The control terminal 18 monitors the marking situation in real time and finely adjusts the position and parameters of the laser marker 45 according to the actual situation to ensure the marking quality. After the marking is completed, the control terminal 18 controls the cylinder 23 to work in the reverse direction, and the driving block 24 drives the clamping plate 26 to release the workpiece. The operator opens the sealing door 12 and takes out the marked workpiece. At the same time, the control terminal 18 can close the solenoid valve 16 to stop the introduction of inert gas.

[0032] The technical effects achieved by the above embodiment are as follows: The laser marker 45 marks the workpiece according to the preset pattern and parameters. During the marking process, the image acquisition camera 43 continuously acquires images. The control terminal 18 monitors the marking situation in real time and finely adjusts the position and parameters of the laser marker 45 according to the actual situation to ensure the marking quality.

[0033] Working principle: When in use, the operator opens the sealing door 12 of the light-transmitting processing box 11, places the marking workpiece 210 on the fixed disk 21, the control terminal 18 controls the cylinder 23 to work, the output end of the cylinder 23 pushes the driving block 24 to slide in the fixed disk 21, the driving block 24 drives the guide rod 25 to move, and the clamping plate 26 at one end of the guide rod 25 approaches the marking workpiece 210 accordingly. After the rubber pad 27 on the clamping plate 26 contacts the workpiece, the spring 28 is compressed, the pressure sensor 29 monitors the pressure change in real time and transmits the pressure signal to the control terminal 18. When the pressure reaches the preset value, the control terminal 18 controls the cylinder 23 to stop working. At this time, the workpiece is firmly and safely fixed in place. Before starting the marking, the control terminal 18 controls the solenoid valve 16 to open according to the workpiece material and marking requirements. The inert gas in the inert gas cylinder 14 enters the light-transmitting processing box 11 through the connecting pipe 15 and the air outlet 17, exhausting the air in the box and creating an inert gas protection environment to prevent the workpiece from oxidizing during the marking process. The control terminal 18 can adjust the opening degree and ventilation time of the solenoid valve 16 as needed to ensure that the processing environment meets the marking requirements. Subsequently, the image acquisition camera 43 acquires the image of the fixed workpiece and transmits the acquired image information to the control terminal 18. The control terminal 18 uses image processing algorithms to analyze the image, determine the position, shape and area to be marked of the workpiece. According to the analysis results, the control terminal 18 calculates the position and angle that the laser marker 45 needs to reach. The control terminal 18 controls the multi-angle freely adjustable parallel mechanism to work according to the calculation results. The first motor 32 drives the rotating part 33 to rotate, adjusting the overall angle direction. The second motor 34 and the third motor 37 respectively drive the first support rod 35 and the third support rod 38 to move. Through the rotational connection of the second support rod 36 and the fourth support rod 39, and the cooperation of the rotating sleeve 310 and the connecting part 311, the laser marker 45 is freely adjustable in multiple angles and directions, enabling it to quickly and accurately reach the marking position. After reaching the specified position, the control terminal 18 sends a marking signal to the laser marker 45, and the laser marker 45 marks the workpiece according to the preset pattern and parameters. During the marking process, the image acquisition camera 43 continuously acquires images, and the control terminal 18 monitors the marking situation in real time and makes fine adjustments to the position and parameters of the laser marker 45 according to the actual situation to ensure the marking quality. After the marking is completed, the control terminal 18 controls the cylinder 23 to work in the reverse direction, and the driving block 24 drives the clamping plate 26 to release the workpiece. The operator opens the sealing door 12 and takes out the marked workpiece. At the same time, the control terminal 18 can close the solenoid valve 16 to stop the supply of inert gas.

Claims

1. A multi-angle visual positioning laser marking machine, characterized in that: include A processing environment adjustment mechanism, the processing environment adjustment mechanism comprising a light-transmitting processing box (11), a sealing door (12) being arranged on the front of the light-transmitting processing box (11), a gas cylinder replacement door (13) being arranged on the upper end of the light-transmitting processing box (11), and an inert gas cylinder (14) being arranged on the upper end of the light-transmitting processing box (11); A multi-angle workpiece fixing mechanism, the multi-angle workpiece fixing mechanism comprising a fixing plate (21) and a fixing block (22), the bottom of the fixing plate (21) being fixedly connected to the bottom of the inner cavity of the light-transmitting processing box (11), the bottom of the fixing block (22) being fixedly connected to the bottom of the inner cavity of the light-transmitting processing box (11), and the interior of the fixing block (22) being fixedly connected to a cylinder (23); A multi-angle freely adjustable parallel mechanism, the multi-angle freely adjustable parallel mechanism comprising a connecting plate (31), the top of the connecting plate (31) being fixedly connected to the top of the inner cavity of the light-transmitting processing box (11), and the bottom of the connecting plate (31) being fixedly connected to a first motor (32); A visual positioning laser marking mechanism comprises a mounting plate (41), a connecting block (42) being fixedly connected to the top of the mounting plate (41), and an image acquisition camera (43) being arranged inside the mounting plate (41).

2. The multi-angle visual positioning laser marking machine according to claim 1 is characterized in that: The processing environment adjustment mechanism further comprises a connecting pipe (15), wherein a solenoid valve (16) is arranged inside the connecting pipe (15), and an air outlet (17) is arranged at one end of the connecting pipe (15) close to the solenoid valve (16), wherein the lower end of the air outlet (17) is connected to the interior of the light-transmitting processing box (11), and the end of the connecting pipe (15) is connected to the air outlet of the inert gas bottle (14).

3. The multi-angle visual positioning laser marking machine according to claim 1 is characterized in that: A control terminal (18) is fixedly connected to the surface of the light-transmitting processing box (11), the control terminal (18) is electrically connected to the solenoid valve (16), and the control terminal (18) is electrically connected to the image acquisition camera (43).

4. The multi-angle visual positioning laser marking machine according to claim 1, characterized in that: The multi-angle workpiece fixing mechanism further comprises a driving block (24), the surface of the driving block (24) being fixedly connected to the output end of the cylinder (23), the surface of the driving block (24) being slidably connected to the interior of the fixing plate (21), and the interior of the driving block (24) being slidably connected to a guide rod (25).

5. The multi-angle visual positioning laser marking machine according to claim 4 is characterized in that: One end of the guide rod (25) is fixedly connected to a clamping plate (26), one side of the clamping plate (26) is fixedly connected to a rubber pad (27), and the side of the clamping plate (26) away from the rubber pad (27) is fixedly connected to a spring (28).

6. The multi-angle visual positioning laser marking machine according to claim 5, characterized in that: One end of the spring (28) is fixedly connected to a pressure sensor (29), the pressure sensor (29) is arranged inside the driving block (24), the pressure sensor (29) is electrically connected to the control terminal (18), and one side of the rubber pad (27) is overlapped with a marking workpiece (210).

7. The multi-angle visual positioning laser marking machine according to claim 1, characterized in that: The multi-angle freely adjustable parallel mechanism further comprises a rotating member (33), a surface of the rotating member (33) being fixedly connected to one end of a rotating shaft of a first motor (32), a second motor (34) being fixedly connected to one side of the rotating member (33), a first support rod (35) being fixedly connected to one end of a rotating shaft of the second motor (34), and a second support rod (36) being rotatably connected to one end of the first support rod (35).

8. The multi-angle visual positioning laser marking machine according to claim 7, characterized in that: A third motor (37) is fixedly connected to the other side of the rotating member (33); a third support rod (38) is fixedly connected to one end of the rotating shaft of the third motor (37); and a fourth support rod (39) is rotatably connected to one end of the third support rod (38).

9. The multi-angle visual positioning laser marking machine according to claim 8, characterized in that: One end of the fourth support rod (39) is connected to the end rotation rod of the second support rod (36), one end of the fourth support rod (39) is fixedly connected to a rotation sleeve (310), the interior of the rotation sleeve (310) is rotationally connected to a connecting piece (311), and the surface of the connecting piece (311) is rotationally connected to the interior of the connection block (42).

10. The multi-angle visual positioning laser marking machine according to claim 1, characterized in that: The visual positioning laser marking mechanism also includes a fixing member (44), the interior of which is fixedly connected to a laser marker (45), and the laser marker (45) is signal-connected to a control terminal (18).

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