WO2018176879A1 - Laser marking machine, method for adjusting distance between scanning head and object for marking, and method for automatically aligning marking machine - Google Patents

Abstract

Disclosed is a laser marking machine comprising a rack (2) and a support table (3) provided on the rack and capable of moving up and down along the rack, wherein the support table is provided with a laser marking assembly (4), and further comprising a controller (8) and a first drive assembly (6) provided on the rack and used for driving the support table to move up and down along the rack, and further comprising a range-finding assembly (5) provided on the laser marking assembly. The range-finding assembly comprises a laser pointer and a laser sensor, wherein the laser pointer is used for emitting laser onto the surface of an object for marking (10), the laser sensor is used for receiving laser reflected back from the surface of the object for marking and sending a signal to the controller, the controller calculates the vertical distance from the surface of the object for marking to the range-finding assembly according to the signal, and the first drive assembly, according to the signal, drives the support table to drive the laser marking assembly to move until a distance between a scanning head (41) and the surface of the object for marking reaches a pre-set distance. Further disclosed are a method for adjusting the distance between a scanning head of a laser marking machine and an object for marking, and a method for automatically aligning a laser marking machine. The above laser marking machine can ensure accurate marking, and increase marking speed.

Description

Laser marking machine, method for adjusting distance between scanning head and marking object, and automatic focusing method for marking machine Technical field

The invention belongs to the technical field of laser marking, and particularly relates to a laser marking machine, a method for adjusting a distance between a scanning head of a laser marking machine and a marking object, and an automatic focusing method of the marking machine.

Background technique

The laser marking machine is a light and mechatronics device that combines laser technology and computer technology. At present, the application of laser marking technology in industry at home and abroad is being paid more and more attention. Various new marking equipments are emerging one after another. It is replacing the traditional marking method with its unique advantages. It can be used in various mechanical parts and electronic elements. Marks are printed on the surface of various objects such as devices, integrated circuit modules, instruments, and meters.

The working principle is that the laser generates laser light, and after being focused by the focusing lens, it is irradiated onto the surface of the marking object, and the marking effect is only ideal when the marking object is located at the focal length position. The prior art manually adjusts and focuses the marking machine manually. The manual adjustment reduces the working efficiency of the marking machine, and the adjustment error is large, which reduces the precision and speed of the marking.

Summary of the invention

The invention provides a laser marking machine, a method for adjusting the distance between the scanning head and the marking object of the laser marking machine and an automatic focusing method of the marking machine. In the prior art, the laser marking machine is manually adjusted and reduced. Marking accuracy and speed issues. The adopted scheme is:

Solution 1: A laser marking machine, comprising a marking machine for placing a marking object, a frame on the marking machine table, a pallet arranged on the frame and movable up and down the rack, and supporting The laser marking component is arranged on the stage. The laser marking component comprises a laser, an optical path component and a scanning head which are sequentially mounted. The optical path component comprises a plurality of concave lenses and/or convex lenses between the laser and the scanning head for adjusting the beam of the incident laser light. The focal length, the marking laser is emitted from the laser, passes through the optical path component, and is incident on the scanning head. The scanning head includes an X mirror and a Y mirror which are sequentially mounted, the X mirror is mounted on the rotating output shaft of the X motor, and the Y mirror is mounted on the On the rotating output shaft of the Y motor, the direction of the rotation axis of the X motor is perpendicular to the direction of the axis of rotation of the Y motor, and the marking laser is sequentially incident on the X mirror and the Y mirror, and is changed by the X mirror and the Y mirror. After the direction, the marking laser is injected toward the marking machine in a scanning manner; further comprising a controller and a first driving component disposed on the frame for driving the pallet to move up and down the rack, the first driving The moving component comprises a plurality of driving motors, and the driving motor is directly or indirectly connected to the pallet, the controller controls the driving motor to drive the pallet to move up and down along the rack; and further comprises a distance measuring component disposed on the pallet or the laser marking component, The distance component comprises a laser pointer and a laser sensor; the distance measuring component, the controller and the first driving component are sequentially connected; the laser pointer is used for emitting an indicating laser to the marking surface, The light sensor is configured to receive the feedback laser of the surface of the marking surface by the diffuse reflection indicating laser, the indicating laser does not coincide with the feedback laser; the laser sensor sends the sensing signal to the controller, and the controller is configured to calculate the angle between the indicating laser and the feedback laser according to the sensing signal. And further calculating the distance from the surface of the marking object to the scanning head; the controller sends a control signal to the first driving component, and the driving motor of the first driving component drives the laser marking component to move according to the control signal, so that the scanning head of the laser marking component The distance from the surface of the marking object matches the marking focal length of the laser marking machine.

Solution 2: The laser marking machine comprises a marking machine for placing the marking object on the base and the base, and the marking machine can be moved up and down, the frame above the marking machine table, and the setting on the frame a laser marking component is disposed on the pallet, the laser marking component comprises a laser, an optical path component and a scanning head which are sequentially mounted, and the optical path component comprises a plurality of concave lenses and/or convex lenses between the laser and the scanning head for adjusting incident The focal length of the laser beam, the marking laser is emitted from the laser, passes through the optical path component, and is incident on the scanning head. The scanning head includes an X mirror and a Y mirror which are sequentially mounted, and the X mirror is mounted on the rotating output shaft of the X motor, and the Y reflection The mirror is mounted on the rotating output shaft of the Y motor. The direction of the rotation axis of the X motor is perpendicular to the direction of the axis of rotation of the Y motor, and the marking laser is sequentially incident on the X mirror and the Y mirror, passing through the X mirror and Y. After the mirror changes direction, the marking laser is scanned toward the marking machine; and the controller and the second driving component for driving the marking machine to move up and down, the second driving The component comprises a plurality of driving motors, and the driving motor is directly or indirectly connected to the marking machine table, wherein the controller controls the driving motor to drive the marking machine to move up and down; and further comprises a distance measuring component disposed on the pallet or the laser marking component, and measuring The distance component comprises a laser pointer and a laser sensor; the distance measuring component, the controller and the second driving component are sequentially connected; the laser pointer is used for emitting an indicating laser to the surface of the marking object, and the laser sensor is used for receiving the diffuse reflection indication of the surface of the marked object The feedback laser of the laser indicates that the laser does not coincide with the feedback laser; the laser sensor sends an induction signal to the controller, and the controller is configured to calculate an angle between the indication laser and the feedback laser according to the sensing signal and further calculate the distance from the surface of the marking object to the scanning head. The controller sends a control signal to the second driving component, and the driving motor of the second driving component drives the laser marking component to move according to the control signal, so that the distance between the scanning head of the laser marking component and the surface of the marking object matches the laser marking machine. Mark the focal length.

Preferably, the upper surface of the base is provided with a vertically extending sliding cavity, and the marking machine is disposed in the sliding cavity, and the second driving component connected to the marking platform is disposed in the sliding cavity.

Preferably, the laser pointer is used to emit an indication laser to a feature point preset on the surface of the marking object, and the laser sensor is configured to receive the feedback laser reflected by the characteristic point and send the sensing signal to the controller, and the controller is configured to receive the sensing signal according to the sensing The signal calculates a vertical distance of the feature point to the scan head and sends a control signal to the first driving component or the second driving component, and the first driving component drives the laser marking component according to the control signal or the second driving component drives the marking machine according to the control information The starting point of the table moving to the surface of the marking object is located below the marking focal length of the scanning head of the laser marking component.

Preferably, the laser pointer is used to receive the laser on the surface of the marking object after the marking start point of the marking object is located below the marking focal length of the scanning head of the laser marking component, and the laser sensor is used to receive the warp. a feedback laser that diffuses the surface of the target and sends a sensing signal to the controller, and the controller is configured to calculate a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and send a fine adjustment signal to the first driving component or the second driving component, first The drive component or the second drive component is used to drive according to the trimming signal Fine tune the calibration.

Scheme 3: a method of adjusting the distance between the scanning head and the marking object, the laser pointer emits laser light to the surface of the marking object; the laser sensor receives the feedback laser diffused and reflected by the surface of the marking object and sends an induction signal to the controller; Calculating a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and transmitting a control signal to the first driving component or the second driving component; the first driving component drives the laser marking component according to the control signal or the second driving component is driven according to the control information The marking machine moves to the surface of the marking object and the marking starting point is below the marking focal length of the scanning head of the laser marking component.

Preferably, the laser pointer emits laser light to a feature point preset on the surface of the marking object; the laser sensor receives the laser light reflected by the characteristic point and sends an induction signal to the controller.

Preferably, the laser pointer emits an indication laser to the surface of the marking object; the laser sensor receives the laser light reflected by the surface of the marking object and sends an induction signal to the controller; the controller calculates the surface of the marking object to the scanning head according to the sensing signal. The vertical distance sends a trimming signal to the first driving component or the second driving component; the first driving component or the second driving component performs driving fine tuning calibration according to the trimming signal.

Scheme 4: Marking machine autofocus method, the optical path assembly includes at least one fixed convex lens and at least one movable concave lens; and further includes a guide rail extending along a direction of the marking laser light, a bracket disposed on the guide rail, and a concave lens fixed On the bracket, the swing motor is directly or indirectly connected to the bracket, and the swing motor control bracket slides back and forth along the guide rail direction, and the swing motor is connected with the controller; the laser pointer is matched with the distance between the scan head and the reference point of the surface feature of the marking object. After marking the focal length of the machine, the laser pointer again emits an indication laser to the surface of the marking object. The laser sensor receives the feedback laser diffusely reflected on the surface of the marking object and sends a sensing signal to the controller, and the controller calculates the marking again according to the sensing signal. The surface feature points the vertical distance from the reference point to the scan head and sends a control signal to the swing motor. The drive bracket and its concave lens slide on the guide rail to change the marking focal length of the marking machine until the marking focal length is equal to the marking surface to the scanning head. The vertical distance.

Preferably, the method further includes: a control terminal connected to the controller, wherein the control terminal stores a digital model of the marking object, and when the marking laser is shot at a point other than the feature reference point on the surface of the marking object, the control terminal is The digital model of the target and the vertical distance from the feature reference point to the scan head calculate the real-time distance between the point of the target surface except the feature reference point and the scan head, and send a signal to the controller, and the controller controls the swing motor adjustment bracket and The sliding position of the concave lens on the guide rail again causes the marking focal length to be equal to the real-time distance of the point of the marking object other than the feature reference point from the scanning head.

The invention has the beneficial effects that: since the invention emits laser light to the surface of the marking object through the laser pointer, the laser sensor is configured to receive the laser light reflected by the surface of the marking object and send the sensing signal to the controller, and the controller calculates the signal according to the first signal. Marking the vertical distance of the surface of the object to the distance measuring component and sending a control signal to the driving component, the first driving component driving the laser marking component according to the control signal to move the marking object to the marking focal length of the laser marking component, or the second The driving component drives the marking platform according to the control signal to move the marking object to the marking focal length of the laser marking component. Therefore, the application can automatically adjust the distance between the scanning head and the marking object to the marking focal length, thereby ensuring the accuracy of the marking and improving the marking speed.

DRAWINGS

Figure 1 is a schematic view showing the structure of a laser marking machine of the present invention

Figure 2 is a side view of the laser marking machine of the present invention

3 is a schematic view showing the working principle of the laser marking machine of the present invention

4 is a schematic structural view of an optical path assembly of a laser marking machine according to the present invention;

Figure 5 is an enlarged view of the portion A in Figure 4

6 is a schematic diagram of the autofocus principle of the laser marking machine of the present invention

detailed description

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

Example 1:

A laser marking machine, as shown in FIG. 1 and FIG. 2, comprises a base 1 on which a frame 2 is arranged, and a vertical extending rail is arranged on the frame 2, and a pallet 3 is arranged on the rail. The pallet 3 is slidable along the guide rails. A laser marking assembly 4 is provided on the pallet 3, and the laser marking assembly 4 is used to generate a marking laser, and the marking laser is emitted from the scanning head 41.

The scanning head includes an X mirror and a Y mirror which are sequentially mounted, the X mirror is mounted on the rotating output shaft of the X motor, and the Y mirror is mounted on the rotating output shaft of the Y motor, and the rotation axis direction of the X motor is opposite to the Y motor The direction of the rotation axis is perpendicular to each other, and the marking laser is sequentially incident on the X mirror and the Y mirror. After the X mirror and the Y mirror change direction, the marking laser is scanned toward the marking machine.

It is then irradiated onto the marking object 10 on the marking platform 11. The laser marking machine pallet 3 is coupled to the first drive assembly, and the first drive assembly 6 is coupled to the controller. The first driving component 6 includes a driver and a screw mechanism, and the control button 81 is manually operated to cause the controller to issue a command to drive the pallet 3 to move up and down along the rail on the frame 2 through the cooperation of the driver and the screw mechanism, thereby adjusting the scanning head. The distance between 41 and the marking object 10.

A distance measuring unit 5 is disposed on one side of the scanning head 41, and a laser pointer and a laser sensor are integrated in the distance measuring unit 5. The laser sensor, the controller and the first drive assembly 6 are electrically connected in sequence. Among them, the laser pointer can be selected with a red laser pointer, and the red laser has high recognizability and is convenient for sensing by the laser sensor.

The first driving component comprises a plurality of driving motors, and the driving motor is directly or indirectly connected to the pallet, the controller controls the driving motor to drive the pallet to move up and down the rack; and further comprises a distance measuring component disposed on the pallet or the laser marking component The distance measuring component comprises a laser pointer and a laser sensor; the distance measuring component, the controller and the first driving component are sequentially connected; the laser pointer is used for emitting an indicating laser to the surface of the marking object, and the laser sensor is used for receiving the surface of the marking object The reflection indicates laser feedback laser, indicating that the laser does not coincide with the feedback laser; the laser sensor sends an induction signal to the controller, and the controller is configured to calculate an angle between the indication laser and the feedback laser according to the sensing signal and further calculate the surface of the marking object to the scanning head The controller sends a control signal to the first driving component, and the driving motor of the first driving component drives the laser marking component to move according to the control signal, so that the scanning head of the laser marking component and the surface of the marking object Offset the matching focal length of the laser marking machine. The laser pointer is configured to emit an indication laser to the feature points preset on the surface of the marking object, the laser sensor is configured to receive the feedback laser reflected by the characteristic point and send the sensing signal to the controller, and the controller is configured to calculate the feature point to the scanning head according to the sensing signal The vertical direction distance sends a control signal to the first driving component, and the first driving component drives the laser marking component to move to the marking surface according to the control signal. The marking starting point is below the marking focal length of the scanning head of the laser marking component. The laser pointer emits an indication laser to the surface of the marking object after the marking starting point is located below the marking focal length of the scanning head of the laser marking component, and the laser sensor is used for receiving the diffuse reflection of the surface of the marking object. The laser is fed back and sends a sensing signal to the controller. The controller is configured to calculate a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and send a fine adjustment signal to the first driving component, and the first driving component performs driving fine adjustment calibration according to the fine adjustment signal.

As shown in FIG. 3, FIG. 4 and FIG. 5, the laser marking assembly includes a laser 42, an optical path assembly 43 and a scanning head 41 which are sequentially mounted. The optical path assembly includes a concave lens 433 and a convex lens 434 between the laser and the scanning head for The focal length of the incident laser beam is adjusted, and the marking laser is emitted from the laser and passed through the optical path component to be incident on the scanning head. The scanning head includes a plurality of reflecting lenses for changing the direction of the marking laser to cause the marking laser to be emitted toward the marking machine.

As shown in FIG. 6, when the marking object 10 is specifically marked, after the laser marking machine starts working, the laser pointer emits laser light to the surface of the marking object 10, and the laser generates diffuse reflection on the surface of the marking object 10, and the laser The sensor is configured to receive the laser light reflected by the surface of the marked object 10, thereby generating an induction and transmitting an induction signal to the controller, and the controller is configured to calculate a vertical distance of the surface of the marking object 10 to the ranging component according to the sensing signal. The principle of calculating the distance by the controller is that according to the linear propagation and emission angle of the laser, after the controller calculates the vertical distance from the surface of the marking object 10 to the ranging component, the controller sends a control signal to the first driving component 6, and the first driving component 6 For driving the pallet 3 according to the control signal, the laser marking assembly 4 is moved until the marking object 10 is located on the marking focal length of the laser marking assembly 4. Thereafter, the laser marking machine marks the marking object 10 according to the position of the marking pattern on the virtual model.

In this embodiment, the first driving component 6 includes a driver and a screw mechanism. In other embodiments, the first driving component that can drive the laser marking component 3 to move up and down along the rail on the frame 2 by a control signal is It falls within the scope of protection of this embodiment. Meanwhile, the present embodiment measures the vertical distance from the surface of the marking object 10 to the distance measuring assembly 5.

Example 2:

The difference between this embodiment and the embodiment 1 is mainly in the second drive assembly. Specifically:

The laser marking machine comprises a marking machine for placing a marking object on the base and the base, the marking machine can be moved up and down, a frame above the marking machine, a pallet set on the frame, and a tray The laser marking component is arranged on the stage. The laser marking component comprises a laser, an optical path component and a scanning head which are sequentially mounted. The optical path component comprises a plurality of concave lenses and/or convex lenses between the laser and the scanning head for adjusting the beam of the incident laser light. The focal length, the marking laser is emitted from the laser, passes through the optical path component, and is incident on the scanning head. The scanning head includes a plurality of reflecting lenses for changing the direction of the marking laser to cause the marking laser to be emitted toward the marking machine; and the controller and the a second driving component for driving the marking machine to move up and down, the second driving component comprises a plurality of driving motors, the driving motor is directly or indirectly connected to the marking machine table, and the controller controls the driving motor to drive the marking machine to move up and down; Also includes setting on the pallet or laser marking group The distance measuring component on the piece, the distance measuring component comprises a laser pointer and a laser sensor; the distance measuring component, the controller and the second driving component are sequentially connected; the laser pointer is used for emitting the indicating laser to the surface of the marking object, and the laser sensor is used for receiving The diffuse reflection on the surface of the marking indicates the feedback laser of the laser, indicating that the laser does not coincide with the feedback laser; the laser sensor sends an inductive signal to the controller, and the controller is configured to calculate the angle between the indicating laser and the feedback laser according to the sensing signal and calculate the hit once. The distance from the surface of the target to the scanning head; the controller sends a control signal to the second driving component, and the driving motor of the second driving component drives the laser marking component to move according to the control signal, so that the scanning head of the laser marking component and the surface of the marking object The distance matches the marking focal length of the laser marking machine.

The upper surface of the base is provided with a vertically extending sliding cavity, and the marking machine is disposed in the sliding cavity, and the second driving component connected to the marking platform is disposed in the sliding cavity.

The laser pointer is configured to emit an indication laser to the feature points preset on the surface of the marking object, the laser sensor is configured to receive the feedback laser reflected by the characteristic point and send the sensing signal to the controller, and the controller is configured to calculate the feature point to the scanning head according to the sensing signal The vertical direction distance sends a control signal to the second driving component, and the second driving component drives the marking machine to move to the marking surface according to the control information. The marking starting point is below the marking focal length of the scanning head of the laser marking component. The laser pointer emits an indication laser on the surface of the marking object after the marking starting point is located below the marking focal length of the scanning head of the laser marking component, and the laser sensor is used to receive the feedback of the diffuse reflection on the surface of the marking object. The laser sends an induction signal to the controller, and the controller is configured to calculate a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and send a fine adjustment signal to the second driving component, and the second driving component is configured to perform driving fine adjustment calibration according to the fine adjustment signal.

Example 3:

This embodiment is improved on the basis of Embodiment 1 or 2. This embodiment illustrates a scheme of a laser marking machine for a stereo marker.

As shown in FIG. 6, when the marking object 10 is specifically marked, the laser marking machine can also be connected to the external control terminal. A virtual model of the marking object 10 is built in the control terminal, and the marking pattern is attached to the surface of the virtual model.

Since the virtual model of the marking object 10 is stored in the control terminal, and the parameters of the virtual model are also stored, as long as the distance from any point on the model to the ranging component 5 is known, any other point on the virtual model can be learned to the ranging. The distance of component 5. Therefore, in this embodiment, a feature point needs to be preset on the surface of the marking object 10, and the feature point may be any point that is easily recognized on the surface of the marking object 10, and the highest point or the lowest point of the surface of the marking object 10 may be selected. At the same time, the position of the point corresponding to the feature point in the virtual model is stored.

As shown in FIG. 6, the feature point 101 is preset as the highest point on the surface of the marking object 10, and the marking object 10 is placed on the marking platform 11, and the marking object 10 is moved to the laser light emitted by the laser pointer to the feature point. 101. The laser pointer is used to emit laser light to the feature point 101, the laser sensor is used to receive the laser light reflected at the feature point 101, and the controller 8 calculates the vertical distance of the feature point 101 to the ranging component 5, and then marks any point on the object 10 to The vertical distance of the ranging assembly 5 shows that the laser marking machine can start marking from any point on the marking object 10, thus setting a marking initial point 102 and transmitting a control signal to the driving assembly. Drive The assembly is adapted to drive movement according to the control signal until the marking initial point 102 is at the marking focal length of the laser marking assembly 4. Thereafter, the internal program of the control terminal controls the laser marking machine to start marking from the marking initial point 102.

Example 4:

In Embodiment 1, when the first driving component 6 drives the laser marking component 4 to move to the marking focal length of the laser marking component 4, the position of the laser marking component 4 and the actual focal length position will be A larger error, especially when the first driving component 6 drives the laser marking component 4 to move a large distance, the error is greater. Therefore, the embodiment provides a fine tuning calibration scheme.

After the laser pointer is driven by the first driving component 6 to move the laser marking component 4 to the marking focal length of the laser marking component 4, the laser pointer again emits laser light to the surface of the marking object, and the laser sensor receives the marking again. The laser reflected from the surface of the object sends an induction signal to the controller, and the controller again calculates the vertical distance from the surface of the marking object to the ranging component and sends a fine adjustment signal to the first driving component, and the first driving component is used to drive the laser according to the fine tuning signal. The component is fine-tuned to improve the accuracy of the position adjustment.

Example 5:

This embodiment is an improvement on the basis of Embodiments 1 and 2, and the specific improvement is as follows.

A laser marking machine, as shown in FIGS. 3 and 4, includes a frame and a laser assembly 4 disposed on the frame, the laser marking assembly 4 includes a laser 42 for generating laser light, and is sequentially disposed in the laser 42 A focusing assembly 43 and a scanning head 41 on the optical path of the laser are generated. Also included is a concentrating mirror controller 7 and a concentrating mirror driving assembly 61, and the concentrating mirror controller 7, the concentrating mirror driving assembly 61, and the optical path assembly 43 are sequentially connected.

The scanning head 41 includes an X mirror for adjusting the optical path to be deflected in the lateral direction and a Y mirror for adjusting the optical path to be deflected in the longitudinal direction. The marking laser is emitted from the laser 42 and is focused by the optical path assembly 43 and adjusted by the scanning head 41 to be irradiated onto the marking object 10.

The optical path assembly 43 includes a support base 431, a bracket 432, a concave lens 433, and a convex lens 434 (in other embodiments, the positions of the two are interchangeable and should be considered equivalent to the present embodiment). The support base 431 is provided with a guide rail 435 extending along the laser optical path. The bracket 432 is disposed on the guide rail 435 and slidable along the guide rail 435. The focus lens 433 is fixed on the bracket 432, and further includes a swing motor directly or indirectly connected to the bracket. The motor control bracket slides back and forth along the guide rail direction, and the swing motor is connected to the controller; therefore, when the bracket 432 slides on the guide rail 435, the focus lens 433 is also moved, and the position of the focus lens 433 at the position of the guide rail 435 corresponds to the focal length of the marking laser, and the focus is passed. The movement of the lens 433 on the guide rail 435 changes the focal length of the marking laser.

A distance measuring assembly 5 is further provided on the laser marking assembly 4, and the distance measuring assembly 5 includes a laser pointer and a laser sensor. The laser pointer is used to emit laser light to the surface of the marking object, the laser generates diffuse reflection on the surface of the marking object 10, and the laser sensor is used to receive the laser light reflected by the surface of the marking object 10, thereby generating an induction and transmitting a first sensing signal to the controller. The concentrating mirror controller 7 is configured to calculate the vertical distance of the marking object surface to the ranging component 5 according to the first sensing signal. The concentrating mirror controller 7 calculates the surface of the marking object to the distance measuring After the vertical distance of the component, a control signal is sent to the concentrating mirror driving component 61. The concentrating mirror driving component 61 is configured to drive the gantry 3 to move the laser component 4 according to the control signal until the marking object is located on the marking focal length of the laser component 4.

Example 6

This embodiment is a method for adjusting the distance between the scanning head and the marking object based on the devices of Embodiments 1 and 2.

A method for adjusting a distance between a scanning head and a marking object, the laser pointer emitting a laser to the surface of the marking object; the laser sensor receiving the feedback laser diffused and reflected by the surface of the marking object and transmitting the sensing signal to the controller; The sensing signal calculates a vertical distance from the surface of the marking object to the scanning head and sends a control signal to the first driving component or the second driving component; the first driving component drives the laser marking component according to the control signal or the second driving component drives the driving according to the control information The marking machine moves to the surface of the marking object and the marking starting point is below the marking focal length of the scanning head of the laser marking component.

The laser pointer emits laser light to a feature point preset on the surface of the marking object; the laser sensor receives the laser light reflected by the feature point and sends an induction signal to the controller.

The laser pointer again emits an indication laser to the surface of the marking object; the laser sensor receives the laser light reflected by the surface of the marking object and sends an induction signal to the controller; the controller calculates the vertical distance from the surface of the marking object to the scanning head according to the sensing signal and The first driving component or the second driving component sends a trimming signal; the first driving component or the second driving component performs driving fine tuning calibration according to the trimming signal.

Example 7

This embodiment is a marking machine autofocus method adopted on the basis of the devices of Embodiments 1 and 2.

A marking machine autofocus method, the optical path assembly comprising at least one fixed convex lens and at least one movable concave lens; further comprising a guide rail extending along a direction of the marking laser light, a bracket disposed on the guide rail, the concave lens being fixed at The bracket further includes a swing motor directly or indirectly connected to the bracket, the swing motor control bracket slides back and forth along the guide rail direction, and the swing motor is connected with the controller; the distance between the scan head and the surface feature reference point of the marking object matches the laser marking machine After the marking focal length, the laser pointer again emits an indicating laser to the surface of the marking object, the laser sensor receives the feedback laser diffused and reflected by the surface of the marking object and sends an induction signal to the controller, and the controller calculates the marking object again according to the sensing signal. The surface feature points the vertical distance from the scanning head to the scanning motor and sends a control signal to the swinging motor. The driving bracket and its concave lens slide on the guide rail to change the marking focal length of the marking machine to the marking focal length equal to the surface of the marking object to the scanning head. vertical distance.

The utility model further comprises a control terminal connected to the controller, wherein the control terminal stores a digital model of the marking object, and the control terminal is based on the digital model of the marking object when the marking laser is incident on the surface of the marking object except the feature reference point. And calculating the real-time distance between the point of the target surface and the scanning head except the characteristic reference point, and sending a signal to the controller, and the controller controls the swing motor adjusting bracket and the concave lens thereof on the guide rail. The sliding position is again such that the marking focal length is equal to the real-time distance of the point of the marking surface other than the feature reference point from the scanning head.

The overall beneficial effect of the present invention is: since the present invention emits laser light to the surface of the marking object through the laser pointer, the laser sensor is configured to receive the laser light reflected by the surface of the marking object and send an induction signal to the controller, the controller according to the first The signal calculates a vertical distance from the surface of the marking object to the ranging component and sends a control signal to the driving component, and the first driving component drives the laser marking component to move to the marking focal length of the laser marking component according to the control signal, or The second driving component drives the marking platform to move according to the control signal to the marking object located at the marking focal length of the laser marking component. Therefore, the application can automatically adjust the distance between the scanning head and the marking object to the marking focal length, thereby ensuring the accuracy of the marking and improving the marking speed.

Variations and modifications of the above-described embodiments may also be made by those skilled in the art in light of the above disclosure. Therefore, the present invention is not limited to the specific embodiments disclosed and described, and the modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although the specific terms are used in the specification, these terms are merely for convenience of description and do not constitute any limitation to the present invention.

Claims (10)

The laser marking machine comprises a marking machine for placing the marking object, a frame on the marking machine table, a pallet arranged on the frame and movable up and down the rack, and a laser on the pallet Marking component The laser marking assembly comprises a laser, an optical path assembly and a scanning head which are sequentially mounted. The optical path assembly comprises a plurality of concave lenses and/or convex lenses between the laser and the scanning head for adjusting the focal length of the incident laser beam, and the marking laser is emitted from the laser. Passing through the optical path component, incident on the scanning head; The scanning head includes an X mirror and a Y mirror which are sequentially mounted, the X mirror is mounted on the rotating output shaft of the X motor, and the Y mirror is mounted on the rotating output shaft of the Y motor, and the rotation axis direction of the X motor is opposite to the Y motor The direction of the rotation axis is perpendicular to each other, and the marking laser is sequentially incident on the X mirror and the Y mirror. After the X mirror and the Y mirror change direction, the marking laser is scanned toward the marking machine. The utility model is characterized in further comprising: a controller and a first driving component arranged on the frame for driving the pallet to move up and down the rack, the first driving component comprises a plurality of driving motors, and the driving motor is directly or indirectly connected to the pallet, The controller controls the driving motor to drive the pallet to move up and down along the rack; The utility model also comprises a distance measuring component arranged on the pallet or the laser marking component, the distance measuring component comprises a laser pointer and a laser sensor, and the distance measuring component, the controller and the first driving component are connected in sequence; The laser pointer is used to emit an indication laser to the surface of the marking object, and the laser sensor is used for receiving the feedback laser of the surface of the marking object by the diffuse reflection indicating laser, indicating that the laser does not coincide with the feedback laser; The laser sensor sends a sensing signal to the controller, and the controller is configured to calculate an angle between the indicating laser and the feedback laser according to the sensing signal and further calculate a distance from the surface of the marking object to the scanning head; The controller sends a control signal to the first driving component, and the driving motor of the first driving component drives the pallet to move according to the control signal, so that the distance between the scanning head of the laser marking component on the pallet and the surface of the marking object matches the laser marking machine. Mark the focal length. The laser marking machine comprises a marking machine for placing a marking object on the base and the base, the marking machine can be moved up and down, a frame above the marking machine, a pallet set on the frame, and a tray A laser marking component is arranged on the stage; The laser marking assembly comprises a laser, an optical path assembly and a scanning head which are sequentially mounted. The optical path assembly comprises a plurality of concave lenses and/or convex lenses between the laser and the scanning head for adjusting the focal length of the incident laser beam, and the marking laser is emitted from the laser. Passing through the optical path component, incident on the scanning head; The scanning head includes an X mirror and a Y mirror which are sequentially mounted, the X mirror is mounted on the rotating output shaft of the X motor, and the Y mirror is mounted on the rotating output shaft of the Y motor, and the rotation axis direction of the X motor is opposite to the Y motor The direction of the rotation axis is perpendicular to each other, and the marking laser is sequentially incident on the X mirror and the Y mirror. After the X mirror and the Y mirror change direction, the marking laser is scanned toward the marking machine. The utility model is characterized in further comprising: a controller and a second driving component for driving the marking machine to move up and down, the second driving component comprises a plurality of driving motors, the driving motor is directly or indirectly connected to the marking machine, and the controller controls driving The motor drives the marking machine to move up and down; The utility model also comprises a distance measuring component arranged on the pallet or the laser marking component, the distance measuring component comprises a laser pointer and a laser sensor, and the distance measuring component, the controller and the second driving component are connected in sequence; The laser pointer is used to emit an indication laser to the surface of the marking object, and the laser sensor is used for receiving the feedback laser of the surface of the marking object by the diffuse reflection indicating laser, indicating that the laser does not coincide with the feedback laser; The laser sensor sends a sensing signal to the controller, and the controller is configured to calculate an angle between the indicating laser and the feedback laser according to the sensing signal and further calculate a distance from the surface of the marking object to the scanning head; The controller sends a control signal to the second driving component, and the driving motor of the second driving component drives the marking machine to move according to the control signal, so that the distance between the scanning head of the laser marking component and the surface of the marking object matches the marking of the laser marking machine. Marking focal length. The laser marking machine according to claim 2, wherein the upper surface of the base is provided with a vertically extending sliding cavity, the marking machine is disposed in the sliding cavity, and the sliding cavity is disposed in the sliding cavity. The second drive component is described. The laser marking machine according to claim 1 or 2, wherein the laser pointer is configured to emit an indication laser to the feature points preset on the surface of the marking object, and the laser sensor is configured to receive the feedback laser reflected by the characteristic point and The controller sends a sensing signal; The controller is configured to calculate a vertical distance of the feature point to the scan head according to the sensing signal and send a control signal to the first driving component or the second driving component, and the first driving component drives the pallet or the second driving component according to the control signal to drive according to the control information The marking machine moves to the surface of the marking object and the marking starting point is below the marking focal length of the scanning head of the laser marking component. The laser marking machine according to claim 4, wherein the laser pointer emits an indication to the surface of the marking object again after the marking starting point is located below the marking focal length of the scanning head of the laser marking component. a laser, the laser sensor is configured to receive a feedback laser that is diffusely reflected on the surface of the marking object and send an induction signal to the controller; The controller is configured to calculate a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and send a fine adjustment signal to the first driving component or the second driving component, and the first driving component or the second driving component is configured to perform driving fine tuning calibration according to the trimming signal . A method of adjusting a scanning head and a marking object distance of a laser marking machine according to claim 1 or 2, wherein: The laser pointer emits a laser to the surface of the marking object; The laser sensor receives the feedback laser diffusely reflected on the surface of the marked object and sends an induction signal to the controller; The controller calculates a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and sends a control signal to the first driving component or the second driving component; The first driving component drives the pallet or the second driving component according to the control signal to drive the marking machine to move to the marking surface according to the control information. The marking starting point is located below the marking focal length of the scanning head of the laser marking component. The method of adjusting the distance between a scanning head and a marking object according to claim 6, wherein: The laser pointer emits laser light to a feature point preset on the surface of the marking object, and the laser sensor receives the laser light reflected by the feature point and sends an induction signal to the controller. The method of adjusting the distance between a scanning head and a marking object according to claim 7, wherein: The laser pointer again emits an indicator laser to the surface of the marking object; The laser sensor receives the laser reflected from the surface of the marked object and sends an induction signal to the controller; The controller calculates a vertical distance from the surface of the marking object to the scanning head according to the sensing signal and sends a fine adjustment signal to the first driving component or the second driving component; The first driving component or the second driving component performs driving fine adjustment calibration according to the trimming signal. A marking machine autofocus method for a laser marking machine according to claim 1 or 2, characterized in that: The optical path assembly includes at least one fixed convex lens and at least one movable concave lens; further comprising a guide rail extending in a direction of highlighting of the marking laser, a bracket disposed on the rail, the concave lens being fixed on the bracket, and including directly or Indirectly connected swing motor, the swing motor control bracket slides back and forth along the guide rail direction, and the swing motor is connected with the controller; After the distance between the scanning head and the reference point of the surface feature of the marking object matches the marking focal length of the laser marking machine, the laser pointer again emits the indicating laser light to the surface of the marking object; The laser sensor receives the feedback laser diffusely reflected on the surface of the marking object and sends an induction signal to the controller; The controller again calculates the vertical distance from the reference point of the surface feature of the marking object to the scanning head according to the sensing signal, and sends a control signal to the swinging motor; The drive bracket and its concave lens slide on the guide rail to change the marking focal length of the marking machine to a marking focal length equal to the vertical distance from the surface of the marking object to the scanning head. The marking machine autofocus method according to claim 9, wherein: The utility model also includes a control terminal connected to the controller, and the digital model of the marking object is stored in the control terminal; When the marking laser hits a point other than the feature reference point on the surface of the marking object, the control terminal calculates the surface of the marking object other than the feature reference point according to the digital model of the marking object and the vertical distance from the characteristic reference point to the scanning head. The real-time distance between the point and the scan head, and signals the controller; The controller controls the sliding position of the oscillating motor adjustment bracket and its concave lens on the guide rail to again make the marking focal length equal to the real-time distance of the marking surface from the point other than the feature reference point and the scanning head.

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