CN202571598U - Device for replacing focusing lens of laser cutting head - Google Patents

Abstract

The utility model discloses a focusing lens replacement device for a laser cutting head, which comprises a laser cutting head provided with a lens seat body cavity, a focusing lens seat matched with the laser cutting head, and the lens seat body cavity is divided into an upper lens seat body cavity and an upper lens seat body cavity which are symmetrical to each other. The lower lens seat body cavity; the focus lens seat body is composed of a mirror seat and a sealing baffle connected to the mirror seat. The mirror seat is inserted into the upper lens seat body cavity or the lower lens seat body cavity, and the focusing lens seat passes Screws are fixed on the laser cutting head. The focusing lens replacement device of the utility model has only one lens seat, and there is no empty mirror seat part used to seal the mirror cavity in the general double focal length lens replacement device, and the sealing baffle connected with the mirror seat is used to seal the mirror cavity. The utility model has the advantages of simple structure, precise positioning and convenient lens replacement, and the cubic shape structure has advantages over the cylindrical shape structure.

Description

A focus lens replacement device for laser cutting head

technical field

The utility model relates to a focus lens replacement device, in particular to a focus lens replacement device for a laser cutting head.

Background technique

Laser cutting technology is widely used in the processing of metal and non-metal materials, which can greatly reduce processing time, reduce processing costs and improve workpiece quality. With the gradual popularization of CO2 laser cutting machine tools, the flexibility of industrial production is gradually increasing, and the frequency of use of dual focal length focusing lenses is gradually increasing. How to realize fast and convenient replacement of lenses with different focal lengths without affecting the processing accuracy has become a focal issue. The existing lens changing device has two lens holders, one of which is an empty mirror holder. There are two mirror holder cavities on the cutting head to cooperate with the empty mirror holder respectively. When using lenses with different focal lengths, it is necessary to exchange the positions of the two lens seats in the lens cavity seat of the cutting head. The disadvantage of this structure is that there are many parts, the structure is not simple enough, and there are many mating surfaces, which may easily cause errors after replacement and affect the machining accuracy. The mirror seat cavity of the traditional lens replacement device is a cylindrical structure, which generates a large stress during vibration, which is easy to affect the processing.

Utility model content

The utility model aims to overcome the deficiencies in the prior art, and provides a focusing lens replacement device for a laser cutting head designed based on a modal analysis method. the

In order to achieve the above object, the technical solution provided by the utility model is:

The laser cutting head focus lens replacement device comprises a laser cutting head 14 provided with a lens seat body cavity, and a focusing lens seat 1 matched with the laser cutting head 14; the lens seat body cavity is divided into a symmetrical upper lens seat body cavity 2 and The lower lens holder body cavity 3; the focusing lens holder body 1 is composed of a mirror holder 15 and a sealing baffle 13 connected to the mirror holder 15, and the mirror holder 15 is inserted into the upper lens holder body cavity 2 or the lower lens holder body cavity 3, The focusing lens base 1 is fixed on the laser cutting head 14 through the screw 4 installed on the sealing baffle 13 . the

Wherein, the laser cutting head 14 is a cube structure. the

In addition, the mirror base 15 includes a lens cavity and a gland 9 placed on the lens cavity, and the gland 9 fixes the focusing lens 6 in the lens cavity through a sealing washer 10 and a spring washer 8 . The upper lens holder body cavity 2 and the lower lens holder body cavity 3 are provided with guiding fitting grooves 12; both sides of the mirror holder 15 are provided with guiding fitting surfaces 11 capable of matching with the guiding fitting grooves.

When replacing the lens, the focusing lens holder body 1 with the replaced lens turned upside down and then inserted into the body cavity of the mirror holder. When the mirror holder 15 is inserted into the upper lens holder body cavity 2, there is a concave washer 7 between the convex end of the focusing lens 6 and the spring washer 8, and a flat washer 5 between the plane end of the focusing lens 6 and the bottom of the mirror holder 15. When the mirror holder 15 is inserted into the lower lens holder body cavity 3, the plane end of the focusing lens 6 is bonded to the spring washer 8, and there is a concave washer 7 and a flat washer 5 between the convex end of the focusing lens 6 and the bottom of the mirror holder 15, wherein the focusing lens 6 The convex end fits with the concave washer 7.

Below in conjunction with accompanying drawing and design principle, the utility model is further described:

Referring to Figures 1 to 4, the laser cutting head focus lens replacement device includes a laser cutting head 14 provided with a lens seat body cavity, and a focusing lens seat 1 matched with the laser cutting head 14; the lens seat body cavity is divided into two symmetrical parts. The upper lens holder body cavity 2 and the lower lens holder body cavity 3, the focusing lens holder body 1 is composed of a mirror holder 15 and a sealing baffle 13 connected with the mirror holder 15, and the mirror holder 15 is inserted into the upper lens holder body cavity 2 or In the lower lens seat cavity 3 , the focusing lens seat 1 is fixed on the laser cutting head 14 through the screw 4 installed on the sealing baffle 13 . The focus lens seat body of the focusing lens replacement device of the laser cutting head of the utility model has only one mirror seat, and there is no empty mirror seat part used to seal the mirror cavity in the general double focal length lens replacement device, so that the overall structure of the device is simpler and the parts Less, so that the matching surface between the lens seat and the seat cavity is less, which can reduce the error caused by lens replacement, and the sealing of the lens seat cavity is realized by the sealing baffle of the focusing lens seat.

Wherein, the laser cutting head 14 is a cube structure, the utility model adopts the finite element modal analysis method to carry out modal analysis on the cutting heads based on the different shape structures of the lens replacement device, compare the modal analysis results of each order, and determine The laser cutting head is designed as a cube structure, which produces less stress than a circular structure under vibration, which increases the service life and accuracy of the laser cutting head;

The mirror base 15 includes a lens cavity and a gland 9 placed on the lens cavity, and the gland 9 fixes the focusing lens 6 in the lens cavity through a sealing washer 10 and a spring washer 8 . The upper lens holder body cavity 2 and the lower lens holder body cavity 3 are provided with a guide fitting groove 12; the two sides of the mirror holder 15 are provided with a guide fitting surface 11 that can cooperate with the guide fitting groove, and the guide fitting groove 12 and the guide fitting surface The setting of 11 can make the focusing lens base 1 more accurately and better positioned and fixed on the laser cutting head 14 .

When replacing the lens, the focusing lens holder body 1 with the replaced lens turned upside down and then inserted into the body cavity of the mirror holder.

When the mirror holder 15 is inserted into the upper lens holder body cavity 2, there is a concave washer 7 between the convex end of the focusing lens 6 and the spring washer 8, and a flat washer 5 between the plane end of the focusing lens 6 and the bottom of the mirror holder 15. When the mirror holder 15 is inserted into the lower lens holder body cavity 3, the plane end of the focusing lens 6 is bonded to the spring washer 8, and there is a concave washer 7 and a flat washer 5 between the convex end of the focusing lens 6 and the bottom of the mirror holder 15, wherein the focusing lens 6 The convex end fits with the concave washer 7.

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

(1) Simple structure, less parts and easy operation.

(2) The mating surface between the lens holder and the holder cavity is less, reducing the error caused by lens replacement.

(3) The body cavity of the mirror base of the replacement device is a cubic structure, which significantly reduces the stress generated under vibration and prolongs the service life of the cutting head.

In a word, the utility model is a square cutting head double-focal-length focusing lens lens replacement device with simple structure, less parts, easy operation, no or less error due to lens replacement.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is a schematic sectional view of the working state of the 190.5mm focal length focusing lens of the present invention;

Fig. 3 is a schematic sectional view of the working state of the 127mm focal length focusing lens of the present invention;

Fig. 4 is a schematic diagram of the structure of the focus lens base when the focus lens with a focal length of 190.5mm is installed in the utility model.

In the figure: 1. focusing lens seat body; 2. upper lens seat body cavity; 3. lower lens seat body cavity; 4. screw; 5. flat washer; 6. focusing lens; 7. concave washer; 8. spring washer; 9. Gland; 10. Sealing gasket; 11. Guide fitting surface; 12. Guide fitting groove; 13. Sealing baffle; 14. Laser cutting head; 15. Mirror holder.

Detailed ways

Example 1

Referring to Figures 1 to 4, taking the replacement of a focus lens with a focal length of 190.5mm and a focus lens with a focal length of 127mm as an example, the laser cutting head focus lens replacement device includes a laser cutting head 14 with a lens seat body cavity, and the matching laser cutting head 14 Focusing lens seat 1; the lens seat body cavity is divided into an upper lens seat body cavity 2 and a lower lens seat body cavity 3 which are symmetrical to each other; the focusing lens seat 1 is composed of a mirror seat 15 and a sealing baffle connected to the mirror seat 15 13, the mirror holder 15 is inserted into the upper lens holder body cavity 2 or the lower lens holder body cavity 3, and the focusing lens holder body 1 is fixed on the laser cutting head 14 through the screw 4 installed on the sealing baffle 13. Wherein, the laser cutting head 14 is a cube structure,

The mirror base 15 includes a lens cavity and a gland 9 placed on the lens cavity, and the gland 9 fixes the focusing lens 6 in the lens cavity through a sealing washer 10 and a spring washer 8 . The upper lens holder body cavity 2 and the lower lens holder body cavity 3 are provided with guiding fitting grooves 12; both sides of the mirror holder 15 are provided with guiding fitting surfaces 11 capable of matching with the guiding fitting grooves.

As shown in Figures 2 and 4, when the focus lens 6 is a focus lens with a focal length of 190.5 mm, a concave washer 7 is formed between the convex end of the focus lens 6 and the spring washer 8, and between the plane end of the focus lens 6 and the bottom of the mirror holder 15 is The flat washer 5 and the mirror seat 15 with the focusing lens 6 are inserted into the body cavity 2 of the upper lens seat.

As shown in Figure 3, when the focus lens 6 is to be replaced with a focus lens with a focal length of 127 mm, the focus lens seat 1 is taken out and the focus lens is replaced. Between the end and the bottom of the mirror holder 15 is a concave washer 7 and a flat washer 5, wherein the convex end of the focusing lens 6 is attached to the concave washer 7. The focusing lens base 1 with the lens replaced is turned upside down and then inserted into the lower lens base cavity 3 .

Embodiment 2 Finite element modal analysis

The modal analysis is carried out for the cutting head of the cubic structure and the cutting head of the cylindrical structure respectively. When modeling, it is required that the top surface areas of the cutting heads of the two shapes are the same, and ALL DOF constraints are established for all nodes on the top surface, and the 1st to 5th order modal analysis is carried out. The result is that the maximum stress of the second-order mode of the cubic structure is: 0.365E12MPa, and the maximum stress of the second-order mode of the cylindrical structure is: 0.553E12MPa. It is clear that the cubic structure based on this lens changing device is superior to the cylindrical structure.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (6)

1. laser cutting head condenser lens changing device more; Comprise the laser cutting head (14) that is provided with the lens mount body cavity; With the supporting condenser lens pedestal (1) of laser cutting head (14); It is characterized in that said lens mount body cavity is divided into last lens mount body cavity (2) and the following lens mount body cavity (3) that is mutually symmetrical; Said condenser lens pedestal (1) is made up of a microscope base (15) and the sealing baffle (13) that links to each other with microscope base (15), in said microscope base (15) insertions in lens mount body cavity (2) or time lens mount body cavity (3); Said condenser lens pedestal (1) is fixed on the laser cutting head (14).

2. laser cutting head condenser lens as claimed in claim 1 is changing device more, it is characterized in that, said laser cutting head (14) is a cube structure.

3. laser cutting head condenser lens as claimed in claim 1 is changing device more; It is characterized in that; Said microscope base (15) comprises lens cavity and places the gland (9) on the lens cavity that said gland (9) is fixed on condenser lens (6) in the lens cavity through seal washer (10) and spring washer (8).

4. laser cutting head condenser lens as claimed in claim 3 is changing device more; It is characterized in that; Be provided with concave surface packing ring (7) between said condenser lens (6) convex surface end and the spring washer (8), be provided with plain washer (5) between condenser lens (6) planar ends and microscope base (15) bottom.

5. laser cutting head condenser lens as claimed in claim 3 is changing device more; It is characterized in that; Said condenser lens (6) planar ends and spring washer (8) are fitted, and are provided with concave surface packing ring (7) and plain washer (5) between condenser lens (6) convex surface end and microscope base (15) bottom.

6. like each described laser cutting head condenser lens of claim 1 to 5 changing device more, it is characterized in that said going up in lens mount body cavity (2) and the following lens mount body cavity (3) is provided with the mating groove (12) that leads; Said microscope base (15) both sides are provided with the guiding mating surface (11) that can cooperate with the guiding mating groove.

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