CN222113877U - Oval cutting head and laser cutting device - Google Patents

Abstract

The utility model relates to laser cutting, and provides an elliptical cutting head, including a shell and a rotating assembly mounted on the shell, an optical assembly mounted on the rotating assembly, an objective lens disposed at the exit end of the shell, the objective lens being located on the exit light path of the optical assembly, the optical assembly comprising an elliptical shaping lens, a conical lens, and a convex lens, the three being sequentially disposed along the optical axis direction and all being coaxial with the rotation axis of the rotating assembly, the objective lens being located on the exit light path of the convex lens; a laser cutting device is also provided, including the above-mentioned cutting head. The cutting head provided by the utility model can make the exit light uniformity and ellipticity of the objective lens better, ensure the cutting processing quality, and is particularly suitable for the processing of special glass with high refraction, and can be compatible with other cutting heads for the same laser.

Description

Elliptical cutting head and laser cutting device

Technical Field

The utility model relates to laser cutting, in particular to an elliptical cutting head and a laser cutting device.

Background

At present, aiming at the laser processing of special glass, high requirements are put on a laser, for example, when high-refraction glass is cut by laser, a WOP (Workshop ofPhotonics) company adopts a conical lens, and narrow pulse width laser is needed, so that the processing quality is difficult to guarantee, and the compatibility is poor.

Disclosure of utility model

The utility model aims to provide an elliptical cutting head and a laser cutting device, which can at least solve part of defects in the prior art.

In order to achieve the above purpose, the embodiment of the utility model provides the technical scheme that the elliptical cutting head comprises a shell and a rotating assembly arranged on the shell, wherein an optical assembly is arranged on the rotating assembly, an object lens is arranged at the outgoing end of the shell and is positioned on the outgoing light path of the optical assembly, the optical assembly comprises an elliptical integer lens, a conical lens and a convex lens, and the three parts are sequentially arranged along the direction of an optical axis and are coaxial with the rotating shaft of the rotating assembly, and the object lens is positioned on the outgoing light path of the convex lens.

Further, the device also comprises a focusing monitoring camera, wherein the focusing monitoring camera is positioned on the reverse transmission light path of the objective lens.

Further, a first reflecting mirror and a second reflecting mirror are arranged in the shell, the first reflecting mirror is located on an emergent light path of the optical assembly, the second reflecting mirror is located on a reflecting light path of the first reflecting mirror, and the objective lens is located on a reflecting light path of the second reflecting mirror.

Further, the focus monitoring camera is located on the transmission light path of the second reflecting mirror.

Further, the optical path distance between the convex lens and the objective lens is 50-20mm.

Further, the device also comprises a facula centroid monitoring camera, wherein a spectroscope is arranged in the shell, the facula centroid monitoring camera is positioned on a transmission light path of the spectroscope, and the optical component is positioned on a reflection light path of the spectroscope.

Further, the rotating assembly comprises a rotating motor, the rotating motor is provided with a light hole, the optical assembly is arranged on the rotating motor, and the optical axis of the optical assembly passes through the light hole.

Furthermore, a cross fork is arranged at the incidence interface of the incidence end of the shell, and the center of the cross fork is positioned on the optical axis of the incidence interface.

The embodiment of the utility model also provides a laser cutting device which comprises a laser and the elliptical cutting head, wherein the incident end of the shell is positioned on the emergent light path of the laser.

Further, the elliptical cutting heads are provided with at least two groups, a beam expander is arranged on an emergent light path of the laser, and the beam expander is connected with each elliptical cutting head through a beam splitting light path.

Compared with the prior art, the optical component of the cutting head has the beneficial effects that in the optical component of the cutting head, the elliptic shaping lens, the conical lens and the convex lens are sequentially arranged along the direction of the light path, the optical axes of the elliptic shaping lens, the conical lens and the convex lens are coaxial, and the optical component is integrally arranged on the rotating component so as to ensure that the optical axis of the optical component is coaxial with the rotating shaft of the rotating component, so that the uniformity and ellipticity of emergent light of the objective lens are better, and the special glass processing for high refraction is particularly realized, the special glass processing for pulse width and other conditions are not required to be particularly limited, and the optical component can be replaced with other cutting heads, and has better compatibility.

Drawings

FIG. 1 is a schematic view of an elliptical cutting head according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a laser cutting device according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the optical path principle of an elliptical cutting head according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram illustrating the eccentricity detection of a conical lens of an elliptical cutting head according to an embodiment of the present utility model;

FIG. 5 is a schematic view of an optical assembly of an elliptical cutting head according to an embodiment of the present utility model mounted on a rotating assembly;

FIG. 6 is a schematic diagram illustrating the adjustment of an optical assembly and a rotating assembly of an elliptical cutting head according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a structure of an elliptical cutting head with a cross at an incident interface according to an embodiment of the present utility model;

fig. 8 is a schematic diagram of normal incidence debugging of an objective lens of an elliptical cutting head according to an embodiment of the present utility model;

FIG. 9 is a schematic diagram of debugging a light spot in the focal depth of an elliptical cutting head according to an embodiment of the present utility model;

fig. 10 is a schematic diagram of spot centroid position adjustment of an elliptical cutting head according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, an embodiment of the present utility model provides an elliptical cutting head 1 comprising a housing 11, a rotating assembly 12, and an optical assembly 13. The cutting head comprises a shell 11, a rotating assembly 12 and an optical assembly 13, wherein the rotating assembly 12 and the optical assembly 13 are arranged on the shell 11, the optical assembly 13 is a main working part of the cutting head 1, a laser beam is used for processing a workpiece after being acted by the optical assembly 13, such as cutting high-refraction glass, the optical assembly 13 is positioned in the shell 11, a rotating motor 121 can be adopted as a power part of the cutting head 1 positioned on the rotating assembly 12, the optical assembly 13 is arranged on the rotating motor 121, and the rotating motor 121 can control the optical assembly 13 to rotate around a rotating shaft. In addition, the cutting head 1 further comprises an objective lens 14, wherein the objective lens 14 is arranged at the outgoing end of the shell 11 and is positioned on the outgoing light path of the optical component 13, namely, the laser beam incident to the cutting head 1 is emitted by the objective lens 14 after being acted by the optical component 13, an outgoing interface is arranged at the outgoing end of the shell 11, the objective lens 14 is detachably arranged at the outgoing interface, and 10X, 20X, 50X and the like can be arranged on the shell 11 according to requirements.

Referring to fig. 1 and 3, the optical element 13 includes an elliptical mirror 131, a conical lens 132 and a convex lens 133, which are sequentially disposed along the optical path direction in the housing 11, that is, the laser beam incident on the cutting head 1 sequentially passes through the elliptical mirror 131, the conical lens 132 and the convex lens 133, and the objective lens 14 is located on the outgoing optical path of the convex lens 133. The optical axes of the three lenses of the optical component 13 are coaxially arranged, and when the adjustment of the optical axes of the three lenses is completed, the optical component 13 is integrally mounted on the rotating component 12, and the optical axis of the adjusting optical component 13 is coaxially arranged with the rotating shaft of the rotating component 12. In this embodiment, the rotating assembly 12 includes a rotating platform 122, the optical assembly 13 is mounted on the rotating platform 122, and the rotating motor 121 can drive the rotating platform 122 to rotate around its own axis, so as to drive the optical assembly 13 to rotate synchronously. The rotary platform 122 has a light hole, which is a cylindrical through hole, and the rotation axis of the rotary platform 122 is the central axis of the light hole, and when the optical component 13 is installed on the rotary platform 122, the optical axis of the optical component 13 is coaxial with the central axis of the light hole. In this embodiment, by controlling the axicon 131, the axicon 132, the convex lens 133, and the rotary platform 122 to be coaxially arranged, the decentration of the axicon 132 is ensured, so that the uniformity and ellipticity of the outgoing light of the objective lens 14 are better, and particularly, the special glass processing with high refraction is not required, and the conditions such as pulse width are not particularly limited, so that very good compatibility with other cutting heads 1 can be formed.

Referring to fig. 1 and 9, in one embodiment, the cutting head 1 further includes a focus monitor camera 15, and the focus monitor camera 15 is located on the reverse transmission path of the objective lens 14. In this embodiment, the focus monitor camera 15 is added, and when the cutting head 1 is installed and debugged, the rotating motor 121 controls the optical assembly 13 to rotate for one circle, and the uniformity of the elliptical light spot intensity at different focal depth positions under different angle states can be observed through the focus monitor camera 15. Specifically, the focus monitor camera 15 is disposed at one side of the exit end of the housing 11, a first mirror 111 and a second mirror 112 are disposed in the housing 11, the first mirror 111 and the second mirror 112 are disposed in parallel, the outgoing light of the optical component 13 is incident on the first mirror 111 at 45 degrees, the reflected light of the first mirror 111 is incident on the second mirror 112 at 45 degrees, the reflected light of the second mirror 112 is normally incident on the objective lens 14, and is forward transmitted to a product through the objective lens 14, the product is taken as a reflecting surface, the reflected light is reversely transmitted to the second mirror 112 through the objective lens 14, and is transmitted to the focusing lens 151 through the second mirror 112, and finally imaged on the focus monitor camera 15, and the focus monitor camera 15 is used as an imager to analyze the light spot in the focal depth. The focus monitor camera 15 is detachably connected to the housing 11, and is insensitive to XY directions, and the focus monitor camera 15 is mainly adjusted to move in the Z direction by a sliding table to obtain a focus spot, where the Z direction refers to the transmission and reflection directions of the second reflecting mirror 112 (or the optical axis direction of the optical assembly 13). Adjusting the height of the product to the depth of focus, adjusting the position and angle of the focusing lens 151 to image the product on the focusing monitor camera 15, rotating the rotating motor 121 for one circle, observing the intensity uniformity of elliptical light spots at different depth of focus positions under different angle states, taking the existing standard detection as a reference, testing the energy distribution of the cutting head 1, and comparing the testing result of the focusing monitor camera 15 with the standard testing result to ensure the consistency of the results.

In addition, the optical path distance between the optical component 13 and the objective lens 14, that is, the distance between the convex lens 133 and the first reflecting mirror 111 and the distance between the second reflecting mirror 112 and the objective lens 14, and the distance between the two lenses in the conventional cutting head 1 are preferably 50-200mm, and when the optical path distance is smaller, the optical component 13 is installed below the rotating platform 122 (the light emitting direction of the cutting head 1 is vertically downward) so that the distance between the convex lens 133 and the first reflecting mirror 111 is smaller, and otherwise when the optical path distance is larger, the optical component 13 is installed above the rotating platform 122 so that the distance between the convex lens 133 and the first reflecting mirror 111 is larger, and at this time, the aperture of the light transmitting hole has a certain requirement not smaller than 30mm.

In one embodiment, the cutting head 1 further includes a light spot centroid monitor camera 16, the light beam splitter 113 is disposed in the housing 11, the light spot centroid monitor camera 16 is located on a transmission light path of the light beam splitter 113, and the optical component 13 is located on a reflection light path of the light beam splitter 113. In this embodiment, the spot centroid monitoring camera 16 is located at the exit end of the housing 11, when the energy consistency of the detected spot by the focus monitoring camera 15 meets the requirement, the laser beam enters the housing 11, and then part of the laser beam enters the focusing lens 161 after passing through the beam splitter 113, and forms a focused spot on the spot centroid monitoring camera 16, so that the spot centroid position can be obtained by the spot centroid monitoring camera 16, and the spot centroid position can be used as a standard, and the angle of the incident laser beam into the housing 11 can be obtained. Generally, at the incidence interface of the incidence end of the housing 11, a cross 114 is disposed at the incidence interface, and the laser beam enters the housing 11 from the cross 114, so that the incidence angle of the laser beam+the position of the cross 114 of the incidence interface can determine the incidence condition of the cutting head 1. The mounting position of the focus monitor camera 15 may be fixed to the housing 11 by a pin, or a plurality of cutting heads 1 may be adjusted by one camera, and if a laser beam enters the housing 11 from the back of the cutting head 1, the focus lens 161 and the focus monitor camera 15 are integrally formed as a detachable common use.

Referring to fig. 1 and 2, the embodiment of the utility model further provides a laser cutting device, which includes a laser 2 and the cutting head 1, wherein an incident end of the housing 11 is located on an outgoing light path of the laser 2. In this embodiment, the cutting head 1 is applied to a cutting device, and the laser 2 emits a laser beam to enter the optical assembly 13 through the incident interface of the housing 11, and then cuts the product through the first reflecting mirror 111, the second reflecting mirror 112 and the objective lens 14 in sequence, so that a better cutting effect can be generated on the high refractive glass. In addition, the cutting device provided by the utility model has better compatibility, and the cutting head 1 can be replaced according to actual processing requirements. The cutting heads 1 may be provided with a plurality of groups, for example, two groups, after the laser beam emitted by the laser 2 is expanded by the beam expander 3, the laser beam after the beam expansion is led into each cutting head 1 by adopting a beam splitting optical path, for example, two groups of reflectors are matched, and one of the reflectors can reflect and transmit, so that the laser beam after the beam expansion can be led into the corresponding cutting head 1.

The embodiment of the utility model also provides an installation method of the elliptical cutting head 1, which is mainly used for installing and debugging the cutting head 1, and specifically comprises the following steps:

S1, adjusting the optical assembly 13 to enable the elliptical shaping mirror 131, the conical lens 132 and the convex lens 133 to be coaxial;

S2, mounting the optical assembly 13 on the rotating assembly 12;

S3, adjusting the rotating assembly 12 and the optical assembly 13 so that the rotating shaft of the rotating assembly 12 is coaxial with the optical axis of the optical assembly 13;

S4, mounting the debugged rotating assembly 12 and the optical assembly 13 in the shell 11;

S5, adjusting an external light path to enable light to normally enter the optical component 13;

s6, observing by using a focusing monitoring camera 15 after debugging is completed, and confirming the completion condition of the previous debugging step according to the light spot state and energy change in the focal depth after one rotation;

S7, after the energy consistency requirement is met, installing a facula centroid monitoring camera 16, and recording the facula centroid position to serve as a standard.

Referring to fig. 1 and 4, when each lens of the optical assembly 13 is coaxially arranged, an eccentric instrument 4 (a conventional eccentric instrument can only detect the focal length of a lens combination with plano-convex, plano-concave, etc., or a lens combination with a definite focal length) is adopted, an image with normal focus or defocus can be presented in a camera 43 by changing the imaging method of the conventional eccentric instrument and using another method of combining a conical lens 41 and a convex lens 42 with the same taper, and the eccentricity of the assembled conical lens 132 can be observed by rotating an air floatation platform, and the position of the conical lens 132 can be adjusted in real time to meet the requirement of eccentricity. The other two lenses (the convex lens 133 and the elliptical shaping lens 131) of the optical component 13 can be sequentially provided with the adjusting conical lens 132, the convex lens 133 and the elliptical shaping lens 131 in the same way, so that the coaxiality of optical axes of the lenses of the optical component 13 after adjustment can be ensured to be very high.

Referring to fig. 4-6, when the rotating assembly 12 and the optical assembly 13 are adjusted, firstly, a dimming jig is installed on the optical test platform, the optical path is roughly adjusted on the rotating motor 121, so that the test optical path is parallel to the normal incidence light transmission hole, then, the optical assembly 13 is installed on the rotating platform 122, firstly, the concentricity and flatness of the installation are detected by a mechanical metering mode, and finally, the change (light spot distribution symmetry, light spot position, characteristic position and the like) of the light spot rotating for one circle is detected by the light beam quality analyzer 123, and the adjusted optical detection result is required to be compared with the test result on the eccentric instrument 4 when the optical assembly 13 is adjusted.

Referring to fig. 1, 7 and 8, when the adjusted rotary member 12 and the optical member 13 are integrally installed in the housing 11, the external optical path (laser beam emitted from the laser) of the cutting head 1 is adjusted so that the laser beam is parallel to the normal incidence optical member 13, specifically, the normal incidence elliptical shaping mirror 131. In a preferred embodiment, a cross 114 is disposed at the incident interface of the housing 11, and the laser beam is incident on the center of the cross 114. The first reflecting mirror 111 and the second reflecting mirror 112 are adjusted in the housing 11 so that the outgoing light of the optical component 13 is parallel to the normal incidence objective lens 14. In a preferred embodiment, a dimming jig is mounted on the objective lens 14, so that the outgoing light is a uniform ring and is equally divided by the cross 114, and the first reflecting mirror 111 and the second reflecting mirror 112 are adjusted so that the transverse line of the elliptical light spot coincides with one side of the cross 114, so that the incident light of the objective lens 14 can be ensured to be normal incidence.

Referring to fig. 1 and 9, in addition, regarding the focus monitor camera 15, the processed product is taken as a reflecting surface, reflected light is attenuated by the objective lens 14 and the second reflecting mirror 112, the focus lens 151 images onto the focus monitor camera 15, analysis of light spots in focal depth is performed, specifically, the height of the product is adjusted to be in focal depth, the position and angle of the focus lens 151 are adjusted to image the product onto the focus monitor camera 15, the rotating motor 121 is controlled to rotate for one circle, the uniformity of elliptical light spot intensity at different focal depth positions under different angle states is observed, the energy distribution of the cutting head 1 is tested firstly by taking the existing standard detection as a reference, and then the tested result of the focus monitor camera 15 is compared with the standard test result to ensure that the results are consistent.

Referring to fig. 1 and 10, for the spot centroid monitoring camera 16, when the energy consistency of the detected light spot by the focus monitoring camera 15 meets the requirement, the laser beam is injected from the center of the cross 114 at the incidence interface of the housing 11, part of the laser beam enters the focusing lens 161 after passing through the beam splitter 113, and a focused light spot is formed on the spot centroid monitoring camera 16, so that the spot centroid position can be obtained by the spot centroid monitoring camera 16 and is used as a standard to obtain the angle of incidence of the laser beam on the housing 11, and thus the incidence condition of the cutting head 1 can be determined by the incidence angle of the laser beam+the position of the cross 114 at the incidence interface.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides an oval cutting head, includes the casing and installs the rotating assembly on the casing, in install optical subassembly on the rotating assembly, the exit end of casing is provided with the objective, the objective is located optical subassembly's exit light way, its characterized in that, optical subassembly includes oval integer mirror, conical lens and convex lens, and the three sets gradually along the optical axis direction and all is coaxial with rotating assembly's rotation axis, the objective is located the exit light way of convex lens.

2. The elliptical cutting head of claim 1, further comprising a focus monitor camera positioned in the reverse transmission path of the objective lens.

3. The elliptical cutting head of claim 2, wherein a first mirror and a second mirror are disposed within the housing, the first mirror being positioned on the exit path of the optical assembly, the second mirror being positioned on the reflection path of the first mirror, and the objective lens being positioned on the reflection path of the second mirror.

4. An elliptical cutting head as in claim 3 wherein the focus monitor camera is positioned in the transmission path of the second mirror.

5. An elliptical cutting head as claimed in claim 3, wherein the optical path distance between the convex lens and the objective lens is 50-20mm.

6. The elliptical cutting head of claim 1 further comprising a spot centroid monitor camera disposed within the housing, the spot centroid monitor camera being positioned in a transmission path of the beam splitter and the optical assembly being positioned in a reflection path of the beam splitter.

7. The elliptical cutting head of claim 1, wherein the rotating assembly comprises a rotating motor having a light aperture, the optical assembly is mounted to the rotating motor, and an optical axis of the optical assembly passes through the light aperture.

8. The elliptical cutting head of claim 1 wherein a spider is provided at the entrance interface of the entrance end of the housing, and wherein the spider center is located on the optical axis of the entrance interface.

9. A laser cutting device comprising a laser and further comprising an elliptical cutting head as claimed in any one of claims 1 to 8, the incident end of the housing being located on the exit optical path of the laser.

10. The laser cutting device according to claim 9, wherein the elliptical cutting heads are provided with at least two groups, a beam expander is arranged on an emergent light path of the laser, and the beam expander is connected with each elliptical cutting head through a beam splitting light path.