CN111515527A

CN111515527A - Laser head focusing device

Info

Publication number: CN111515527A
Application number: CN202010477662.3A
Authority: CN
Inventors: 蒋修青; 朱小杰
Original assignee: Gangchun Laser Technology Jiangsu Co ltd
Current assignee: Gangchun Laser Technology Jiangsu Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-11

Abstract

The invention discloses a laser head focusing device, and belongs to the technical field of laser processing. The laser head focusing device comprises a shell, a lens barrel, a driving mechanism and a limiting mechanism, wherein the shell is provided with a hollow cavity, and a laser beam can penetrate through the shell; the lens barrel is arranged in the shell, a lens is coaxially arranged in the lens barrel and the lens barrel, and the outer wall of the lens barrel is connected with the inner wall of the shell in a sliding manner; the driving mechanism comprises a linear motor, the linear motor is fixedly arranged on one side of the shell, and the output end of the linear motor is connected to the lens barrel so as to drive the lens barrel to reciprocate along the direction of the central axis of the lens barrel; the limit mechanism is configured to control a stroke of the linear motor. The laser head focusing device realizes the focusing of the laser head, has high response speed, can improve the perforating efficiency, has no abrasion of a transmission part, and can prolong the service life of the laser head.

Description

Laser head focusing device

Technical Field

The invention relates to the technical field of laser processing, in particular to a laser head focusing device.

Background

The during operation of laser cutting head can utilize focusing device to focus sometimes according to the processing needs, and traditional focusing mode is manual focusing, and along with laser beam machining's application is more and more extensive, and processing requirement to laser is higher and higher, and more laser cutting head needs automatic focusing. However, as the power of the laser cutting head is continuously increased, the thickness of the plate to be cut and processed becomes thicker and thicker, and due to the thickness of the plate, frequent punching is needed in the processing process, and the change of the focal position is realized by driving the lens to move along the axis of the laser cutting head by the driving mechanism in the punching process.

At present, most focusing device utilizes servo motor + lead screw's mode to drive the lens motion, converts the rotary motion of lead screw into linear motion, and the drawback of this kind of mode is that transmission efficiency is low, and speed response is slow, and the lead screw can often wear and tear in addition, causes life to hang down, especially frequent fenestrate application scenario, and in addition, lead screw wearing and tearing can bring iron fillings, dust, greasy dirt etc. and pollute the inside lens of laser head, cause the loss.

Disclosure of Invention

The invention aims to provide a laser head focusing device which can improve the response speed of focusing and prolong the service life of a laser head.

In order to achieve the purpose, the invention adopts the following technical scheme:

a laser head focusing apparatus comprising:

a housing having a hollow cavity and through which a laser beam can pass;

the lens barrel is arranged in the shell, a lens is coaxially arranged in the lens barrel and the lens barrel, and the outer wall of the lens barrel is connected with the inner wall of the shell in a sliding manner;

the driving mechanism comprises a linear motor, the linear motor is fixedly arranged on one side of the shell, and the output end of the linear motor is connected to the lens barrel so as to drive the lens barrel to reciprocate along the direction of the central axis of the lens barrel; and

a limit mechanism configured to control a stroke of the linear motor.

Optionally, the linear motor is a voice coil motor, a stator of the voice coil motor is connected to the housing, and a mover of the voice coil motor is connected to the lens barrel.

Optionally, the anti-falling mechanism is further included for preventing falling of the lens barrel.

Optionally, the anti-falling mechanism comprises an elastic piece, and two ends of the elastic piece are respectively connected to the fixed end of the linear motor and the output end of the linear motor.

Optionally, a buffer mechanism is further included for buffering of the lens barrel.

Optionally, the buffer mechanism includes a buffer pad provided at an end of the lens barrel where the laser beam exits.

Optionally, the limiting mechanism includes a first photoelectric switch and a second photoelectric switch fixed to the housing and sequentially arranged at intervals along the moving direction of the lens barrel, the first photoelectric switch corresponds to the highest point of the lens barrel, the second photoelectric switch corresponds to the lowest point of the lens barrel, and an induction member is arranged on the outer wall of the lens barrel and used for triggering the first photoelectric switch or the second photoelectric switch.

Optionally, the lens barrel further comprises a position adjusting mechanism, and the position adjusting mechanism is used for acquiring the position information of the lens barrel.

Optionally, the position adjustment mechanism comprises:

the grating ruler is connected with the lens cone; and

and the reading head is connected to the shell and is arranged opposite to the grating ruler.

Optionally, a cooling mechanism is further included for cooling the lens barrel.

The invention has the beneficial effects that:

the laser head comprises a shell, a lens barrel, a driving mechanism and a limiting mechanism, wherein the shell is provided with a hollow cavity, a laser beam can penetrate through the shell, the lens barrel is arranged in the shell, a lens is coaxially arranged in the lens barrel, the outer wall of the lens barrel is connected with the inner wall of the shell in a sliding mode, the driving mechanism comprises a linear motor, the lens barrel is directly driven by the linear motor to move in a reciprocating mode along the direction of the central axis of the lens barrel, the stroke of the linear motor is controlled by the limiting mechanism, the focusing of the laser head is achieved, the response speed is high, the punching processing efficiency can be improved, no transmission part is abraded, and.

Drawings

Fig. 1 is a schematic perspective view of a laser head focusing device according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of another view angle of a laser head focusing device according to an embodiment of the present invention;

fig. 3 is a schematic top view of a laser head focusing device according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view taken along line a-a in fig. 3.

In the figure: 1. a housing; 2. an elastic member; 3. a voice coil motor; 4. a limiting mechanism; 41. a first photoelectric switch; 42. a sensing member; 43. a second photoelectric switch; 5. a cushion pad; 6. a position adjustment mechanism; 61. a first mounting plate; 62. a second mounting plate; 7. a lens; 8. a cooling mechanism; 81. an annular groove; 82. closing the plate; 9. a lens barrel.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the attached fig. 1-4.

As shown in fig. 1 to 4, a laser head focusing device includes a housing 1, a lens barrel 9, a driving mechanism, and a limiting mechanism 4. The housing 1 has a hollow cavity and the laser beam can penetrate the housing 1. The lens barrel 9 is arranged in the shell 1, the lens 7 is coaxially arranged in the lens barrel 9 and the lens barrel 9, and the outer wall of the lens barrel 9 is connected with the inner wall of the shell 1 in a sliding mode. The driving mechanism comprises a linear motor, the linear motor is fixedly arranged on one side of the shell 1, and the output end of the linear motor is connected to the lens barrel 9 so as to drive the lens barrel 9 to reciprocate along the direction of the central axis of the lens barrel 9. The limit mechanism 4 is configured to control the stroke of the linear motor.

This embodiment passes through linear electric motor direct drive lens cone 9 along the central axis direction reciprocating motion of lens cone 9 to through stop gear 4 control linear electric motor's stroke, realize the focusing of laser head, response speed is fast, can improve the efficiency of perforation processing, and does not have the wearing and tearing of driving medium, thereby can improve the life of laser head.

Specifically, the lens 7 may be fixed inside the lens barrel 9 by a spring collar. The inner wall of the housing 1 is provided with a guide rail, and the lens barrel 9 is slidably connected to the guide rail. Alternatively, the guide rail may be a cross roller guide rail, and the cross roller guide rail may make the lens barrel 9 move more stably and with higher moving precision.

As shown in fig. 2 to 4, the limiting mechanism 4 includes a first photoelectric switch 41 and a second photoelectric switch 43 fixed to the housing 1 and sequentially arranged at intervals along the moving direction of the lens barrel 9, the first photoelectric switch 41 corresponds to the highest point of the lens barrel 9, the second photoelectric switch 43 corresponds to the lowest point of the lens barrel 9, a sensing member 42 is arranged on the outer wall of the lens barrel 9, and the sensing member 42 is used for triggering the first photoelectric switch 41 or the second photoelectric switch 43. It can be understood that, when the lens barrel 9 drives the sensing member 42 to move to the position of the first photoelectric switch 41, the linear motor rotates reversely to drive the lens barrel 9 to move reversely, and when the lens barrel 9 drives the sensing member 42 to move to the position of the second photoelectric switch 43, the linear motor rotates reversely again to drive the lens barrel 9 to move reversely, so as to reciprocate, thereby realizing the reciprocating motion of the lens barrel 9.

In order to further improve the efficiency of focusing, optionally, the linear motor is a voice coil motor 3, a stator of the voice coil motor 3 is connected to the housing 1, and a mover of the voice coil motor 3 is connected to the lens barrel 9. The model number of the voice coil motor 3 can be selected from TMEC 0050-025-000. The voice coil motor 3 has the characteristics of simple structure, small volume, high speed, high acceleration response speed and the like, so that the focusing efficiency can be further improved.

The laser head is vertically arranged when processing a workpiece, because the lens barrel 9 and the self weight of other parts installed in the lens barrel 9, the lens barrel 9 can fall downwards under the condition of power failure, in order to prevent the lens barrel 9 from falling, as shown in fig. 2, the laser head focusing device in the embodiment further comprises an anti-falling mechanism, and the anti-falling mechanism is used for preventing the lens barrel 9 from falling.

Optionally, the anti-falling mechanism comprises an elastic part 2, and two ends of the elastic part 2 are respectively connected to the fixed end of the linear motor and the output end of the linear motor. Specifically, the fixed end of the linear motor is connected to the housing 1 through a connecting plate, the output end of the linear motor is connected to the lens barrel 9 through another connecting plate, and the two ends of the elastic member 2 are respectively fixed to the two connecting plates. Alternatively, the elastic member 2 is a tension spring, and the tension spring may be provided in one, two or more. When the lens barrel 9 moves to the middle of the whole stroke, the tension spring is in a stretching position, so that the gravity of the load borne by a part of the linear motor can be offset, and the load of the linear motor is reduced.

In order to further protect the lens barrel 9, as shown in fig. 2 and 4, the laser head focus adjusting apparatus in this embodiment further includes a buffer mechanism for buffering the lens barrel 9.

Because the laser head is vertically arranged during processing, if the lens barrel 9 falls, the lens barrel may impact the bottom of the housing 1 and be damaged, and in order to better protect the lens barrel 9, optionally, the buffer mechanism includes a buffer pad 5, and the buffer pad 5 is arranged at the end of the lens barrel 9 where the laser beam exits. Alternatively, the material of the cushion 5 is polyurethane, and the material of the cushion 5 is not limited to the invention.

For more accurately adjusting the moving position of the lens barrel 9, the laser head focusing device in the present embodiment further includes a position adjusting mechanism 6, and the position adjusting mechanism 6 is used for acquiring the position information of the lens barrel 9. By acquiring the position information of the lens barrel 9, more accurate positioning is possible.

Alternatively, as shown in fig. 2, the position adjustment mechanism 6 includes a grating scale and a reading head, and the grating scale is connected to the lens barrel 9. The reading head is connected to the shell 1 and arranged opposite to the grating ruler. One side of lens cone 9 is provided with first mounting panel 61, is provided with second mounting panel 62 on the casing 1, and the grating chi is connected in first mounting panel 61, and the reading head is connected in second mounting panel 62.

Further, as shown in fig. 4, in order to make the laser head applicable to high-power processing, the laser head focusing apparatus in this embodiment further includes a cooling mechanism 8, and the cooling mechanism 8 is used for cooling the lens barrel 9. Optionally, a cooling channel is formed in the circumferential direction of the lens barrel 9, and cooling liquid can be introduced into the cooling channel, so that the lens barrel 9 is cooled. For example, the cooling passage may be an annular groove 81 formed in the end portion of the lens barrel 9 and closed by a closing plate 82, and the side wall of the lens barrel 9 is provided with an inlet and an outlet for the cooling liquid.

In the embodiment, the lens barrel 9 is directly driven by the linear motor to reciprocate along the central axis direction of the lens barrel 9, and the stroke of the linear motor is controlled by the limiting mechanism 4. The lens barrel 9 is protected by the arrangement of the anti-falling mechanism and the buffer mechanism. The accurate adjustment of the position of the lens barrel 9 is realized through the arrangement of the position adjusting device. The focusing of laser head has been realized to this embodiment, and response speed is fast, can improve the efficiency of perforation processing, and does not have the wearing and tearing of driving medium to can improve the life of laser head.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. A laser head focusing device, comprising:

a housing (1) having a hollow cavity and through which a laser beam can penetrate the housing (1);

the lens barrel (9) is arranged in the shell (1), a lens (7) is coaxially arranged in the lens barrel (9) and the lens barrel (9), and the outer wall of the lens barrel (9) is in sliding connection with the inner wall of the shell (1);

the driving mechanism comprises a linear motor, the linear motor is fixedly arranged on one side of the shell (1), and the output end of the linear motor is connected to the lens cone (9) so as to drive the lens cone (9) to reciprocate along the direction of the central axis of the lens cone (9); and

a limit mechanism (4), the limit mechanism (4) being configured to control a stroke of the linear motor.

2. The laser head focusing device according to claim 1, characterized in that the linear motor is a voice coil motor (3), the stator of the voice coil motor (3) is connected to the housing (1), and the mover of the voice coil motor (3) is connected to the lens barrel (9).

3. The laser head focusing device according to claim 1, further comprising an anti-falling mechanism for preventing falling of the lens barrel (9).

4. The laser head focusing device of claim 3, characterized in that the anti-falling mechanism comprises an elastic member (2), and two ends of the elastic member (2) are respectively connected to the fixed end of the linear motor and the output end of the linear motor.

5. The laser head focusing device according to claim 1, further comprising a buffer mechanism for buffering the lens barrel (9).

6. The laser head focusing device according to claim 5, characterized in that the buffer mechanism comprises a buffer pad (5), the buffer pad (5) being provided at an end of the barrel (9) from which the laser beam exits.

7. The laser head focusing device according to claim 1, wherein the limiting mechanism (4) comprises a first photoelectric switch (41) and a second photoelectric switch (43) which are fixed on the housing (1) and sequentially arranged at intervals along the moving direction of the lens barrel (9), the first photoelectric switch (41) corresponds to the highest point position of the lens barrel (9), the second photoelectric switch (43) corresponds to the lowest point position of the lens barrel (9), a sensing member (42) is arranged on the outer wall of the lens barrel (9), and the sensing member (42) is used for triggering the first photoelectric switch (41) or the second photoelectric switch (43).

8. The laser head focusing device according to any one of claims 1 to 7, further comprising a position adjusting mechanism (6), the position adjusting mechanism (6) being configured to acquire position information of the lens barrel (9).

9. The laser head focusing arrangement of claim 8, characterized in that the position adjustment mechanism (6) comprises:

the grating ruler is connected with the lens barrel (9); and

the reading head is connected to the shell (1) and arranged opposite to the grating ruler.

10. The laser head focusing device according to any of claims 1 to 7, further comprising a cooling mechanism (8), the cooling mechanism (8) being configured to cool the lens barrel (9).