CN212145001U

CN212145001U - Double-focus depth-adjusting compound laser cutting head

Info

Publication number: CN212145001U
Application number: CN202020589935.9U
Authority: CN
Inventors: 吴德林; 丁伟
Original assignee: Chongqing Weilide Laser Technology Co ltd
Current assignee: Chongqing Weilide Laser Technology Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-12-15
Anticipated expiration: 2030-04-20

Abstract

The utility model relates to a laser cutting accessory technical field, specifically speaking relates to a double-focus compound laser cutting head of adjusting depth, which comprises an outer shell, the upper portion of shell is provided with upper portion central focusing and adjusts well device, and the shell is close to one side outer wall of upper portion central focusing and adjusts well device and installs the protecting cover, and the outside of protecting cover is provided with the knob, and the lower part of shell is provided with lower part annular focusing and adjusts well device, and the inside of shell is located upper portion central focusing and adjusts the upper and lower both sides of well device and be equipped with light path focusing sliding sleeve, and the inside of shell is located the upper and lower both sides that lower part annular focusing adjusted. The utility model discloses a manufacturing and designing is simple, and the lens has only a curvature radius, and the dynamic range of focus distance adjustment is big, need not change the lens, can follow 0 to changing between the several millimeters, and the coaxial regulation of focusing lens light path about guaranteeing utilizes the facula size that changes incident beam to distribute the regulation to the laser intensity of two upper and lower focuses.

Description

Double-focus depth-adjusting compound laser cutting head

Technical Field

The utility model relates to a laser cutting accessory technical field, specifically speaking relates to a double-focus compound laser cutting head of adjusting depth.

Background

The traditional double focusing method adopts a focusing lens with two curvature radiuses on the same optical axis, so that laser beams form two times of focusing on different parts of a workpiece, because the curvatures of the two parts are different, a focus is respectively formed on the upper plane and the lower plane of the workpiece, and when cutting is carried out, the upper focus is positioned on the upper surface of the workpiece, and the lower focus is positioned near the lower surface of the workpiece.

The method has the following defects: 1. the technical difficulty is that two focusing lenses with curvature radiuses are ground on the same lens. 2. In order to deal with materials with different thicknesses, various bifocal lenses with different focal lengths need to be prepared, and the bifocal lenses are replaced in time when in use and are inconvenient to use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a double-focus compound laser cutting head of adjusting depth to solve the problem that proposes in the above-mentioned background art.

In order to achieve the purpose, the utility model provides a double-focus depth-adjusting compound laser cutting head, which comprises a shell, wherein the upper part of the shell is provided with an upper central focusing and centering device, the outer wall of one side of the shell, which is close to the upper central focusing and centering device, is provided with a protecting cover, the outer side of the protecting cover is provided with a knob, the lower part of the shell is provided with a lower annular focusing and centering device, the upper side and the lower side of the upper central focusing and centering device in the shell are provided with light path focusing sliding sleeves, and the upper side and the lower side of the lower annular focusing and centering device in the shell are provided with annular focusing lens centering sliding sleeves; the lower annular focusing centering device is of a square plate-shaped structure, four corners of the lower annular focusing centering device are provided with fixing holes, one outer wall of one side of the lower annular focusing centering device is provided with two screw holes, the screw holes are connected with adjusting screws in a threaded manner, the middle of the lower annular focusing centering device is provided with a round hole, the inner side of the round hole is provided with a lens centering sleeve, the inner side of the lens centering sleeve is provided with a lens, a spring is arranged between the outer wall of one side, away from the adjusting screws, of the lens centering sleeve and the inner wall of the round hole, and the upper central focusing centering device and the lower annular focusing centering device are identical in structure except for the inner lens.

Preferably, the top of the shell is provided with a round QBH interface.

Preferably, the side edge of the inner wall of the knob is connected with the light path focusing sliding sleeve through a connecting rod.

Preferably, the protective cover is fixed to the outer wall of the housing by bolts.

Preferably, the lenses in the upper central focusing and centering device and the lower annular focusing and centering device are a central focusing sheet and an annular focusing sheet respectively.

Preferably, the curvature of the central focusing sheet is the same as that of the annular focusing sheet, the center of the central focusing sheet is a lens, the outer side of the central focusing sheet is a plane mirror, the center of the annular focusing sheet is a plane mirror, and the outer side of the annular focusing sheet is a lens.

Preferably, an upper focusing diaphragm drawer and a lower focusing diaphragm drawer are further arranged outside the housing.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the double-focus depth-adjusting compound laser cutting head lens is simple to manufacture, and only one curvature radius is provided for one lens.

2. The dynamic range of focal distance adjustment is large, and the lens can be changed from 0 to several millimeters without replacing the lens, so that the lens can be applied to most occasions.

3. An adjusting mechanism with adjusting is adopted to ensure the coaxial adjustment of the light paths of the upper and lower focusing lenses.

4. The laser intensity of the upper and lower focuses is distributed and adjusted by changing the spot size of the incident beam.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

fig. 3 is a schematic structural view of the middle-lower annular focusing centering device of the present invention;

fig. 4 is a schematic structural view of an upper focusing diaphragm drawer and a lower focusing diaphragm drawer according to the present invention;

FIG. 5 is a schematic structural view of the central focusing sheet and the annular focusing sheet of the present invention;

fig. 6 is a working principle diagram of the present invention.

In the figure: 1. a housing; 11. a QBH interface; 12. an upper focusing diaphragm drawer; 13. a lower focusing diaphragm drawer; 2. an upper central focus centering device; 3. a lower annular focus centering device; 31. a screw hole; 32. a fixing hole; 33. a circular hole; 34. a lens centering sleeve; 35. adjusting screws; 36. a lens; 361. a central focusing sheet; 362. an annular focusing sheet; 37. a spring; 4. a protective cover; 5. a knob; 51. a connecting rod; 6. a light path focusing sliding sleeve; 7. the annular focusing lens is centered on the sliding sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The utility model provides a double-focus depth-adjusting compound laser cutting head, as shown in fig. 1-5, including a shell 1, the upper portion of shell 1 is provided with upper portion central focusing centering device 2, a position for adjusting the upper portion lens, shell 1 is close to one side outer wall of upper portion central focusing centering device 2 and installs protecting cover 4, the outside of protecting cover 4 is provided with knob 5, the lower part of shell 1 is provided with lower portion annular focusing centering device 3, a position for adjusting the lower portion lens, the inside of shell 1 is located upper portion central focusing centering device 2's upper and lower both sides and is equipped with light path focusing sliding sleeve 6, a position for adjusting upper portion central focusing centering device 2 from top to bottom, the inside of shell 1 is located lower portion annular focusing centering device 3's upper and lower both sides and is equipped with annular focusing lens centering sliding sleeve 7; the lower annular focusing centering device 3 is of a square plate-shaped structure, four corners of the lower annular focusing centering device 3 are provided with fixing holes 32, one outer wall of one side of the lower annular focusing centering device 3 is provided with two screw holes 31, the screw holes 31 are internally threaded with adjusting screws 35, the middle of the lower annular focusing centering device 3 is provided with a round hole 33, the inner side of the round hole 33 is provided with a lens centering sleeve 34, the inner side of the lens centering sleeve 34 is provided with a lens 36, a spring 37 is arranged between the outer wall of one side of the lens centering sleeve 34, which is far away from the adjusting screws 35, and the inner wall of the round hole 33, and the upper central focusing centering device 2 and the lower annular focusing centering device 3 are identical in structure except for an inner.

Preferably, the top of the housing 1 is provided with a circular QBH interface 11.

Preferably, the inner wall side of the knob 5 is connected with the light path focusing sliding sleeve 6 through a connecting rod 51.

Preferably, the protective cover 4 is fixed to the outer wall of the housing 1 by bolts.

Preferably, the lenses 36 in the upper central focusing device 2 and the lower annular focusing device 3 are a central focusing sheet 361 and an annular focusing sheet 362, respectively.

Preferably, the curvature of the central focusing sheet 361 is the same as that of the annular focusing sheet 362, the center of the central focusing sheet 361 is a lens, the outer side is a flat mirror, the center of the annular focusing sheet 362 is a flat mirror, and the outer side is a lens.

Preferably, the outer part of the housing 1 is further provided with an upper focusing diaphragm drawer 12 and a lower focusing diaphragm drawer 13, which can assist us to precisely adjust the incident optical axis of the fiber laser to the mechanical axis of the system, so as to create conditions for the next optical axis adjustment of the focusing lens 36.

It should be noted that two lenses 36 are mounted above and below the same optical axis, the two lenses 36 have the same outer diameter and different focal lengths, as shown in fig. 6, the diameter of the lens portion of the central focusing lens is D1, the diameter of the lens portion of the annular focusing lens is D2, (D2-D1)/2 is the annular width H, the annular focusing sheet is an annular lens, the portion with the central diameter D1 is a flat mirror, the portion in the middle of the central focusing lens D1 is a lens, and the portion with the peripheral annular width H is a flat mirror. When the laser beam is expanded and then vertically enters a focusing system consisting of double-focus lenses, the central part of the focusing system passes through a middle plane mirror of a short-focus lens by focusing of a central focusing lens and is emitted to the lower plane of a workpiece to form a first focus. The annular part of the beam after beam expansion passes through the annular plane mirror of the central focusing lens to be emitted to the annular lens of the annular focusing lens, and is focused on the upper plane of the workpiece to form a second focus. Thereby completing the bifocal cutting system. In order to achieve a distance between two focal points, a linear adjustment from perfect coincidence (0 distance) to the required distance is possible, wherein the focal length JF1 of the central focusing mirror is JF2+ JG, and in the test JF2 is the focal length of the annular focusing mirror, and JG is the minimum distance required to fix the mechanical structure of the two lenses. In this case, assuming that the workpiece has a thickness S, the upper focal point is required to be SU above the workpiece, and the lower focal point is SD from the lower plane of the material, the distance SJF by which the upper and lower lenses are extended is S + (± SU) + (± SD) (if the upper and lower focal points are required to be located at a certain point in the material, SU and SD are both negative numbers).

In addition, the adjusting screws 35 arranged at two sides of the lower annular focusing centering device 3 capable of floating and deflecting in the horizontal direction are laterally pressed to generate left-right and front-back movement, a resultant force is formed by the adjusting screws and the springs 37 arranged at opposite surfaces, the center of the lens 36 is forcedly moved to a required position, and the purpose of adjusting the axis of the optical path is achieved.

When the double-focus depth-adjusting compound laser cutting head is used, firstly, in the first step, the protecting cover 4 is opened to remove the upper central focusing centering device 2 and the lower annular focusing centering device 3 from the light path, and the upper central focusing centering device and the lower annular focusing centering device are replaced by an upper focusing diaphragm drawer 12 and a lower focusing diaphragm drawer 13 which are specially configured in the device. The second step is that: the laser instrument passes through QBH connector 11, sends laser instruction ruddiness, screws off laser nozzle, will be passed through the figure that focus diaphragm drawer 12 and focus diaphragm drawer 13 sheltered from down, projects on "nozzle" export the white paper of below. The four optical axis adjusting screws of the connection part of the QBH joint 11 are repeatedly adjusted to enable a red light spot divided by the cross diaphragm to be observed on white paper, the shielded shadow line is thinnest, and the light passing dot at the center is the largest, so that the red light beam sent from the QBH joint 11 can be considered to be concentric with the optical axis of the central focusing sheet 361 and the annular focusing sheet 362. The third step: the upper focusing diaphragm drawer 12 and the lower focusing diaphragm drawer 13 are taken down, the upper central focusing centering device 2 is replaced, the laser nozzle is installed, the left centering adjusting screw 35 and the right centering adjusting screw 35 are adjusted by a conventional method until the focused red light is emitted out of the nozzle. The fourth step: the lower annular focus centering device 3 is returned and the lower centering adjustment screw 35 is adjusted in the same way until another focus is obtained below the nozzle, and the optical axis adjustment screw on the QBH adapter 11 cannot be adjusted again when the third and fourth steps are performed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a double-focus compound laser cutting head of adjusting depth, includes shell (1), its characterized in that: an upper central focusing centering device (2) is arranged on the upper portion of the shell (1), a protecting cover (4) is arranged on the outer wall of one side, close to the upper central focusing centering device (2), of the shell (1), a knob (5) is arranged on the outer side of the protecting cover (4), a lower annular focusing centering device (3) is arranged on the lower portion of the shell (1), light path focusing sliding sleeves (6) are arranged in the shell (1) and located on the upper side and the lower side of the upper central focusing centering device (2), and annular focusing lens centering sliding sleeves (7) are arranged in the shell (1) and located on the upper side and the lower side of the lower annular focusing centering device (3); the lower annular focusing centering device (3) is of a square plate-shaped structure, four corners of the lower annular focusing centering device (3) are provided with fixing holes (32), the outer wall of one side of the lower annular focusing and centering device (3) is provided with two screw holes (31), the screw hole (31) is internally threaded with an adjusting screw (35), the middle part of the lower annular focusing and centering device (3) is provided with a round hole (33), a lens centering sleeve (34) is arranged on the inner side of the round hole (33), a lens (36) is arranged on the inner side of the lens centering sleeve (34), a spring (37) is arranged between the outer wall of one side of the lens centering sleeve (34) far away from the adjusting screw (35) and the inner wall of the round hole (33), the upper central focusing and centering device (2) and the lower annular focusing and centering device (3) have the same structure except for the inner lens.

2. The dual-focus depth-adjusting compound laser cutting head of claim 1, wherein: the top of the shell (1) is provided with a circular QBH interface (11).

3. The dual-focus depth-adjusting compound laser cutting head of claim 1, wherein: the side edge of the inner wall of the knob (5) is connected with the light path focusing sliding sleeve (6) through a connecting rod (51).

4. The dual-focus depth-adjusting compound laser cutting head of claim 1, wherein: the protecting cover (4) is fixed on the outer wall of the shell (1) through bolts.

5. The dual-focus depth-adjusting compound laser cutting head of claim 1, wherein: the lenses (36) in the upper central focusing and centering device (2) and the lower annular focusing and centering device (3) are respectively a central focusing sheet (361) and an annular focusing sheet (362).

6. The dual-focus depth-adjusting compound laser cutting head of claim 5, wherein: the curvatures of the central focusing sheet (361) and the annular focusing sheet (362) are the same, the center of the central focusing sheet (361) is a lens, the outer side of the central focusing sheet is a plane mirror, the center of the annular focusing sheet (362) is a plane mirror, and the outer side of the annular focusing sheet is a lens.

7. The dual-focus depth-adjusting compound laser cutting head of claim 1, wherein: an upper focusing diaphragm drawer (12) and a lower focusing diaphragm drawer (13) are further arranged outside the shell (1).