CN111360412A

CN111360412A - Laser marking device and method for realizing stepless focusing through multiple fixed-point keys

Info

Publication number: CN111360412A
Application number: CN201911170042.9A
Authority: CN
Inventors: 徐强; 陈松钦; 黄河森
Original assignee: Guangzhou Xinke Laser Equipment Co ltd
Current assignee: Guangzhou Xinke Laser Equipment Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-03

Abstract

The invention provides laser marking equipment and a method for realizing stepless focusing through a plurality of fixed point keys, wherein the equipment is provided with N height fixed point keys connected with a controller, and the controller is connected with a driving motor; m target heights corresponding to the height fixed point keys are stored in the controller, and the height fixed point keys are used for controlling the laser marking assembly to be lifted or lowered to the corresponding target heights; the controller receives trigger information from the nth height fixed point key so that the driving motor drives the laser marking assembly to rise or fall to a target height hn. The user can select to press a fixed point key corresponding to the similar target height by pre-estimating the marking height of the marked object, so that the laser marking assembly can be quickly lifted. Meanwhile, the current height information is obtained through the controller, the current height information is compared with the focal length, the focal length of the light path component is controlled through the swing motor according to the comparison result, and focusing is rapidly achieved.

Description

Laser marking device and method for realizing stepless focusing through multiple fixed-point keys

Technical Field

The invention relates to the technical field of laser marking, in particular to laser marking equipment and a method for realizing stepless focusing through a plurality of fixed-point keys.

Background

The laser marking equipment is an optical and electromechanical integrated equipment integrating laser technology and computer technology. The application of laser marking technology in industry at home and abroad is being gradually emphasized by people, and various novel marking devices emerge endlessly. The method replaces the traditional marking method with the unique advantages, and can print marks on the surfaces of various objects such as various mechanical parts, electronic components, integrated circuit modules, instruments and the like. The working principle is that the laser generates laser, the laser irradiates the surface of a marking object after being focused by the focusing lens, and the marking object has a relatively ideal marking effect only when being located at a focal position.

In the prior art, focusing on laser marking is realized through two parts, wherein the first part is lifting focusing on a lifting upright post, the focusing is rough adjustment, namely a lifting platform is used for lifting the whole laser marking assembly, and the distance from the laser marking assembly to a marked object is adjusted to be the same as the focal length of the marking assembly; the second part is that in the subsequent marking process, the Z-axis dynamic focusing module in the marking assembly is used for adjusting along with the change of the distance from the marking assembly to each marking point on the surface of the marked object. The existing focusing mode has higher precision on the lifting focusing requirement of the first part, so that repeated correction is needed during lifting focusing, and a large amount of time is wasted.

Therefore, aiming at the problems in the prior art, it is important to provide a fixed-point key stepless focusing laser marking technology capable of realizing one-key quick focusing.

Disclosure of Invention

The invention aims to avoid the defects in the prior art and provides laser marking equipment for realizing stepless focusing through a plurality of fixed point keys. Meanwhile, the current height information is obtained through the controller, the current height information is compared with the focal length, the focal length of the light path component is controlled through the swing motor according to the comparison result, and focusing is rapidly achieved.

The purpose of the invention is realized by adopting the following technical scheme:

a laser marking device for realizing stepless focusing through a plurality of fixed point keys comprises a box body, wherein a marking platform is formed at the bottom of the box body, a rack is formed on the inner side wall of the box body, and a laser marking assembly is movably mounted on the rack;

the laser marking assembly comprises a marking box, and a laser, a light path assembly and a scanning head are sequentially arranged in the marking box; the light path component is used for adjusting the beam focal length of the incident laser and comprises a plurality of concave lenses and/or convex lenses; the marking laser is emitted from the laser, passes through the light path component and enters the scanning head, and the scanning head comprises a plurality of reflecting lenses and is used for changing the direction of the marking laser so that the marking laser is emitted towards the marking machine table;

the driving assembly is arranged on the rack and used for driving the laser marking assembly to move up and down along the rack, the driving assembly comprises a driving motor, and the driving motor is indirectly connected with the laser marking assembly;

the laser marking equipment is provided with N height fixed point keys, namely a first height fixed point key, a second height fixed point key, an … … nth height fixed point key and a … … nth height fixed point key; wherein N is more than or equal to 1 and less than or equal to N;

the N height fixed-point keys are connected with a controller, and the controller is connected with a driving motor;

m target heights corresponding to the height fixed point keys are stored in the controller, wherein the M target heights are h1, h2, h3, … …, hn and … … hM respectively, and N is more than or equal to 1 and is less than or equal to M which is equal to N;

the height fixed point key is used for controlling the laser marking assembly to rise or fall to the corresponding target height.

Specifically, once the first height fixed point key is triggered, the laser marking assembly is raised or lowered to a target height h 1; once the second height fixed point key is triggered, the laser marking assembly is raised or lowered to a target height h 2; … …, once the Nth height fixed point key is triggered, the laser marking component is raised or lowered to the target height hn;

when the controller receives trigger information from the nth height fixed point key, the controller sends a control signal to the driving motor according to the trigger information so that the driving motor drives the laser marking assembly to rise or fall to a target height hn;

and when the laser marking assembly is lifted or lowered to the target height hn, the driving motor stops driving.

Specifically, it is assumed that the laser marking device is provided with three height fixed point keys, that is, N is 3, which are a first height fixed point key, a second height fixed point key, and a third height fixed point key, respectively; the target heights corresponding to the three height fixed-point keys are 15cm, 25cm and 50cm in sequence. When a user wants to perform lifting focusing, the marking height required by the marking object can be calculated through estimation, the marking height actually required by the marking object is set to be 50.5cm, and the user presses the third height fixed point key through estimation, so that the laser marking assembly is lifted to 50 cm; at the moment, the height information of 50cm is transmitted to the controller, the controller compares the difference between the height information of 50cm and the focal length to form a comparison result, and the optical path component automatically adjusts the focal length of the marking laser according to the comparison result. In the technical scheme, the swing range of the swing motor can be adaptively moved backwards or forwards by prolonging the length of the light path component guide rail.

Preferably, the drive assembly comprises a drive motor and two parallel sliding guide rails.

Preferably, the sliding guide rail is embedded with a connecting block which moves up and down along the sliding guide rail, and the laser marking assembly is connected with the sliding guide rail through the connecting block.

Preferably, the laser marking device further comprises a control box, the control box is connected with the controller, and the N height fixed-point keys are arranged on the control box.

Specifically, set up high fixed point button on the control box, realize the control to laser marking equipment through the control box, be similar to remote controller etc. accessible wireless mode is to marking equipment and carry out high lifting control.

Preferably, the height fixed point keys are three, namely a first height fixed point key, a second height fixed point key and a third height fixed point key;

the target height corresponding to the first height fixed point key is 25 cm; the target height corresponding to the second height fixed point key is 35 cm; the target height corresponding to the third height fixed point key is 50 cm;

preferably, the target height has a value of 2cm to 80 cm.

Preferably, the optical path component comprises a support base, a support, a concave lens and a convex lens.

The support seat is provided with a guide rail extending along a laser light path, the support is arranged on the guide rail and can slide along the guide rail, the concave lens is fixed on the support, the support also comprises a swing motor connected with the support, the swing motor controls the support to slide back and forth along the guide rail, and the swing motor is connected with the controller.

The invention also provides a method for realizing stepless focusing by a plurality of fixed point keys, which is applied to the laser marking equipment, and the method comprises the following steps:

step S1: the controller acquires input focal length information hx and stores the focal length information hx to the controller;

step S2: the controller receives trigger information from the nth height fixed point key;

step S3: the controller reads the target height hn corresponding to the nth height fixed point key according to the received trigger information, and forms a control signal to be sent to the driving motor;

step S4: the driving motor receives a control signal and raises or lowers the laser marking assembly to a target height hn according to the control signal;

step S5: the controller acquires current height position information hn of the laser marking assembly in the marking process, compares the current height position information hn with prestored focal length information hx to form a comparison result hd, and sends a control signal to the swing motor;

step S6: and the swing motor receives the control signal and controls the lens in the light path component to move on the guide rail to change the focal length of the marking laser.

Specifically, when the method is used, the marking height required by the marking object is estimated only approximately, so that the corresponding height fixed point key is selected, accurate calibration is not required in the lifting focusing link, and the subsequent focusing step is automatically completed by the controller after the key is pressed down, so that a large amount of manual time is saved. For example, when the actually required focal distance is 50.5cm, the height fixed point key can be selected to be pressed (the target height corresponding to the key is 50cm), at this time, the laser marking assembly rises to the height of 50cm, the controller compares the current position of 50cm with the focal information of 50.5cm, and then the controller automatically controls the focal length of the optical path assembly to change according to the comparison result so as to achieve the target focal length; therefore, the lifting focusing (rough adjustment) and fine adjustment can be rapidly and automatically completed, and the use is more convenient.

The invention has the beneficial effects that:

the laser marking device is provided with a plurality of height fixed point keys, each height fixed point key corresponds to a specific target height, and a user can select to press down the fixed point key corresponding to the similar target height by pre-estimating the marking height of a marked object, so that the laser marking assembly can be quickly lifted. Meanwhile, the current height information is obtained through the controller, the current height information is compared with the focal length, the focal length of the light path component is controlled through the swing motor according to the comparison result, and focusing is rapidly achieved. In the lifting focusing link, accurate calibration is not needed, and the subsequent focusing step is automatically completed by the controller after the key is pressed down, so that a large amount of manual time is saved. The problem of need proofreading lift focusing repeatedly during artifical focusing is solved, one-key focusing is realized. And this technical scheme is simple easy to operate, has with low costs, and applicable in the occasion that the mark requirement is not high to beating, satisfies user's demand, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of a stepless focusing laser marking device provided by the present invention;

FIG. 2 is a schematic diagram of an electrical connection of the infinitely focusing laser marking apparatus provided in the present invention;

FIGS. 3 to 4 are schematic diagrams of internal structures of the stepless focusing laser marking device provided by the present invention;

FIG. 5 is a schematic view of a driving assembly of the laser marking apparatus with stepless focusing according to the present invention;

fig. 6 to 8 are schematic structural diagrams of optical path components of the stepless focusing laser marking device provided by the invention.

Description of the reference numerals

The device comprises a box body 1, heat dissipation holes 11, a marking platform 2, a rack 3, a laser marking assembly 4, a driving assembly 5, a height fixed point key 6 and a lampshade 7;

4a tray, 41 scan head, 42 laser, 43 optical path components; 431 a supporting seat, 432 a bracket, 433 a concave lens, 434 a convex lens, 435 a guide rail and 436 a swing motor;

51 drive motor, 52 slide guide;

61 a first height pointing button, 62 a second height pointing button, 63 a third height pointing button.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 8, the embodiment provides a laser marking machine for realizing stepless focusing through a plurality of fixed point keys, which includes a box 1, wherein heat dissipation holes 11 are formed in a side wall of the box 1, the box has a heat dissipation function, a marking platform 2 is formed at the bottom of the box, a rack 3 is formed on a side wall of the box 1, and a laser marking assembly 4 is movably mounted on the rack 3;

the laser marking machine also comprises a driving component 5 and a controller (not shown in the figure), wherein the driving component 5 is arranged on the machine frame 3 and is used for driving the laser marking component 4 to move up and down, left and right along the machine frame 3;

the driving assembly 5 comprises a driving motor 51 and two parallel sliding guide rails 52, a connecting block moving up and down along the sliding guide rails is embedded on the sliding guide rails 52, and the laser marking assembly is connected with the sliding guide rails through the connecting block (not shown). And a lamp shade 7 with the caliber gradually increased from top to bottom is arranged below the laser emergent port and used for determining the marking range of the laser.

As shown in fig. 4 to 8, the laser marking assembly 4 includes a marking box, the marking box is provided with a tray 4a, and the tray 4a is sequentially provided with a laser 42, an optical path assembly 43 and a scanning head 41.

The optical path assembly 43 includes a support base 431, a support 432, a concave lens 433 and a convex lens 434 (in other embodiments, the convex lens and the concave lens may be interchanged and should be considered as equivalent arrangements to the present embodiment).

The supporting seat 431 is provided with a guide rail 435 extending along a laser light path, the bracket 432 is arranged on the guide rail 435 and can slide along the guide rail 435, the concave lens 433 (focusing lens) is fixed on the bracket 432, the focusing lens focusing device also comprises a swinging motor 436 directly or indirectly connected with the bracket, the swinging motor 436 controls the bracket to slide back and forth along the guide rail direction, and the swinging motor 436 is connected with the controller.

Therefore, when the support 432 slides on the guide rail 435, the concave lens 433 is also driven to move, the position of the concave lens 433 on the guide rail 435 corresponds to the focal length of the marking laser, the marking laser is emitted from the laser, passes through the optical path assembly 43, enters the scanning head 41, and the focal length of the marking laser is changed by the movement of the concave lens 433 on the guide rail 435.

As shown in fig. 1-2, the laser marking machine is provided with three height fixed point keys 6, which are a first height fixed point key 61, a second height fixed point key 62 and a third height fixed point key 63; i.e., N-3;

the three height fixed point keys 6 are connected with a controller, and the controller is connected with a driving motor 51;

the controller is internally stored with three target heights corresponding to the height fixed

point keys

61, 62 and 63, wherein the three target heights are h 1-15 cm, h 2-25 cm and h 3-50 cm, namely, M-N-3;

the height fixed point key 6 is used for controlling the laser marking assembly 4 to be raised or lowered to the corresponding target height;

when the controller receives trigger information from the nth height fixed point key, the controller sends a control signal to the driving motor according to the trigger information so that the driving motor drives the laser marking assembly to rise or fall to a target height hn; n is more than or equal to 1 and less than or equal to 3;

when the laser marking assembly 4 is raised or lowered to the target height hn, the drive motor 51 stops driving.

In this embodiment, the marking object is placed on the marking table 2, the marking height required by the marking machine is estimated to be about 25cm by a user in advance, at this time, the user presses the second height fixed point key 62, the controller controls the driving motor 51 to drive the laser marking assembly 4 to be raised to the height of 25cm, and the raising and focusing of the laser marking assembly 4 are rapidly realized; then in the marking process, the controller acquires the current height position information hn of the laser marking assembly 4 in the marking process, compares the current height position information hn with the prestored focal length information hx to form a comparison result hd, and sends a control signal to the swing motor 436; the swing motor 436 receives a control signal to control the lens in the optical path assembly to move on the guide rail to change the focal length of the marking laser. Realize quick focusing, improved and beaten mark speed and beat mark precision.

The controller generally refers to a device for executing control instructions and operation data, and may be a large-scale integrated circuit Controller (CPU), or may be divided into a plurality of small-scale controllers according to functional requirements, and the controllers are respectively disposed at different positions, and the above arrangements are equivalent.

When specifically marking a marked object, after the laser marking machine is started to work, the laser marking assembly 4 moves up and down along the sliding guide rail 52 under the control of the driving motor 51 according to the height fixed point key 6 pressed down by a user; for example, when the marking is performed for the first time, the pre-calculated height of the marking object is 50.3cm, the third height fixed point key 63 is pressed to enable the laser marking component 4 to rapidly move to the height of 50cm, and when the pre-calculated height of the marking object is 16cm during the second time, the first height fixed point key 61 is pressed to enable the laser marking component 4 to rapidly drop to the height of 15cm from the height of 50cm, and then in the marking process, the focal length of the optical path component is adjusted under the control of the controller until the marking object is located on the marking focal length of the laser marking component 4. And then marking the marking object by the laser marking machine according to the position of the marking pattern on the virtual model. Under the condition of some specific marking objects, because the marking height is relatively stable, the technical scheme is more electrically controlled, the structure is simple, the cost is low, and the automatic focusing can be realized through key operation.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A laser marking device for realizing stepless focusing through a plurality of fixed point keys comprises a box body, wherein a marking platform is formed at the bottom of the box body, a rack is formed on the inner side wall of the box body, and a laser marking assembly is movably mounted on the rack;

the driving assembly is arranged on the rack and used for driving the laser marking assembly to move up and down along the rack, the driving assembly comprises a driving motor, and the driving motor is indirectly connected with the laser marking assembly; the method is characterized in that:

the height fixed point key is used for controlling the laser marking assembly to rise or fall to the corresponding target height;

2. Laser marking device according to claim 1, characterized in that the drive assembly comprises a drive motor and two parallel sliding guides.

3. The laser marking device as claimed in claim 2, wherein a connecting block moving up and down along the sliding guide rail is embedded in the sliding guide rail, and the laser marking assembly is connected with the sliding guide rail through the connecting block.

4. The laser marking device according to claim 1, further comprising a control box, the control box being connected to the controller, the N height set point keys being provided on the control box.

5. The laser marking device according to claim 1, wherein the height pointing keys are three, namely a first height pointing key, a second height pointing key and a third height pointing key.

6. The laser marking device according to claim 5, wherein the first height pointing key corresponds to a target height of 25 cm; the target height corresponding to the second height fixed point key is 35 cm; the target height corresponding to the third height fixed point key is 50 cm.

7. Laser marking device according to claim 1, characterized in that the target height has a value of 2-80 cm.

8. The laser marking apparatus of claim 1, wherein the optical path assembly includes a support base, a bracket, a concave lens, and a convex lens.

9. The laser marking apparatus as claimed in claim 8, wherein the supporting base is provided with a guide rail extending along the laser path, the support is provided on the guide rail and is slidable along the guide rail, the concave lens is fixed on the support, and further comprising a swing motor linked to the support, the swing motor controlling the support to slide back and forth along the guide rail, the swing motor being connected to the controller.

10. A stepless focusing method applied to the laser marking device as claimed in any one of claims 1 to 9, characterized in that the method comprises: