A short working distance laser cutting head gas jet nozzle

Abstract

The utility model relates to the field of cutting head air jet, concretely to a short working distance laser cutting head air jet, including protection mirror knob, and the upper surface of protection mirror knob is provided with connecting groove, still include: mounting portion, mounting portion fixedly arranged in connecting groove, and the air injection part in protection mirror knob sprays air to the lower surface of lens through the air hole in mounting portion, in the utility model, the air injection structure is integrated in the inside of lens mounting seat, and the effective gas protection under the very short working distance is realized, the high pressure gas is introduced into the exhaust groove through the connecting air hole on the protection mirror barrel, and this layer of air film can effectively block and blow off the pollutants such as metal vapor, molten splashes produced in the processing, and the pollution speed of protection lens is significantly slowed down. The problem that the protection lens is easy to be polluted and frequently replaced due to the short working distance cutting head cannot install the traditional air jet is solved, thereby the service life of protection lens is prolonged, the equipment maintenance downtime is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of cutting head nozzles, and more particularly to a short working distance laser cutting head nozzle. Background Technology

[0002] In laser cutting equipment, the protective lens at the end of the cutting head is crucial for preventing spatter and fumes from contaminating the internal optical components. In traditional cutting heads, due to their longer working distance, there is ample space to install a separate air nozzle device below the protective lens. The gas emitted by this device can both blow away slag from the workpiece surface and form an upward airflow barrier, delaying contamination of the protective lens.

[0003] However, for devices like Bezier cutting heads, which have short working distances, the distance between the protective lens and the workpiece surface is extremely short, typically only about ten millimeters. This extremely limited space makes it impossible to accommodate traditional, independently mounted air nozzle structures. Therefore, existing short-working-distance cutting heads generally lack effective airflow protection, causing their protective lenses to be directly exposed to contaminants. The lenses become contaminated quickly, requiring frequent downtime for replacement, which severely impacts the equipment's production efficiency and continuous operation capability. Utility Model Content

[0004] The main objective of this invention is to provide a short-working-distance laser cutting head nozzle to solve the problems raised in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a short working distance laser cutting head nozzle is provided, including a protective lens knob, a connecting groove on the upper surface of the protective lens knob, and a mounting part, which is fixedly disposed in the connecting groove. A lens is fixedly disposed in the mounting part, and the nozzle in the protective lens knob sprays air to the lower surface of the lens through the airflow channel in the mounting part, forming an air film on the lower surface of the lens to protect the lens.

[0006] Furthermore, the upper end of the sidewall of the connecting groove is provided with threads.

[0007] Furthermore, a through hole is provided at the center of the lower surface of the connecting groove, and two air nozzle mounting holes that connect to the connecting groove are symmetrically provided on the outer arc wall of the protective mirror knob.

[0008] Furthermore, the jet section includes an air nozzle, which is fixedly installed inside the air nozzle mounting hole.

[0009] Furthermore, the mounting part includes a protective lens tube, which is fixedly disposed in the connecting groove.

[0010] Furthermore, a lens mounting groove is provided on the upper surface of the protective lens barrel, and the lens is fixedly installed in the lens mounting groove. An exhaust groove is provided on the lower surface of the lens mounting groove. The exhaust groove has a tapered structure that is wider at the top and narrower at the bottom, and a slot hole is provided through the center of the lower surface of the exhaust groove.

[0011] Furthermore, the airflow includes a number of connecting air holes arranged in a ring array on the outer arc wall of the protective lens tube, and one end of each connecting air hole has an air outlet that connects to the exhaust groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention integrates the jetting structure inside the lens mounting base, achieving effective gas protection at extremely short working distances. High-pressure gas is introduced into the exhaust groove through the connecting air hole on the protective lens barrel and finally ejected from the groove. Since the groove is located directly below the lens mounting groove, the ejected gas first forms a comprehensive protective gas film on the lower surface of the protective lens. This gas film effectively blocks and disperses contaminants such as metal vapor and molten spatter generated during processing, significantly slowing down the contamination rate of the protective lens. This solves the problem of easy contamination and frequent replacement of protective lenses caused by the inability to install traditional jet nozzles in short-working-distance cutting heads, thereby extending the service life of the protective lens, reducing equipment maintenance downtime, and improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the cutting head air nozzle in a preferred embodiment of the present invention;

[0015] Figure 2 This is a schematic cross-sectional view of the air nozzle of the cutting head in a preferred embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view of the protective mirror knob in a preferred embodiment of the present invention;

[0017] Figure 4 This is a cross-sectional view of the mounting section in a preferred embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the cutting head structure in a preferred embodiment of the present invention.

[0019] Figure label:

[0020] 1. Protective mirror knob; 11. Connecting groove; 111. Through hole; 112. Thread; 113. Air nozzle mounting hole;

[0021] 2. Mounting section; 21. Protective lens barrel; 22. Connecting vent; 211. Lens mounting slot; 212. Vent slot; 213. Slot hole; 221. Vent hole. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] This embodiment provides a short working distance laser cutting head nozzle, including a protective mirror knob 1, such as... Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, a connecting groove 11 is formed on the upper surface of the protective mirror knob 1, which is used to connect with the lower end of the Bezier cutting head. A thread 112 is formed at the upper end of the side wall of the connecting groove 11, and the end of the Bezier cutting head is also threaded; the threads of the two mesh together for threaded connection. A through hole 111 is formed through the center of the lower surface of the connecting groove 11, which allows the laser beam to pass through. A countersunk platform is formed between the through hole 111 and the annular groove wall of the connecting groove 11.

[0024] Two air nozzle mounting holes 113 are symmetrically opened on the outer arc wall of the protective mirror knob 1. Both air nozzle mounting holes 113 are connected to the internal connecting groove 11, and the air nozzles are fixedly installed in the two air nozzle mounting holes 113.

[0025] Also includes: Installation part 2, such as Figure 2 , Figure 4 , Figure 5 As shown, the mounting part 2 is fixedly disposed in the connecting groove 11. The mounting part 2 includes a protective lens tube 21, the outer edge of which protrudes outward and can overlap the countersunk platform formed between the through hole 111 and the annular groove wall of the connecting groove 11. Thus, the mounting part 2 can be placed in the protective lens knob 1. When the protective lens knob 1 is threaded onto the end of the Bezier cutting head, the end of the Bezier cutting head will extend into the connecting groove 11 and contact and press the mounting part 2, so that it is stably installed in the protective lens knob 1.

[0026] A lens mounting groove 211 is provided on the upper surface of the protective lens barrel 21. The protective lens is placed and fixed in the lens mounting groove 211. An annular exhaust groove 212 is provided at the center of the lower surface of the lens mounting groove 211. Its structure is designed as a tapered structure that is wider at the top and narrower at the bottom. This structure helps to guide and evenly distribute airflow.

[0027] A slot 213 is formed downwards through the center of the lower surface of the exhaust groove 212. This slot 213 allows the laser beam to pass through. On the outer arc wall of the protective lens barrel 21, a plurality of connecting vents 22 are arranged in a circular array. One end of each connecting vent 22 is used to connect to the nozzle mounting hole 113 to introduce high-pressure gas. The other end of each connecting vent 22 has an exhaust port 221. These exhaust ports 221 are all connected to the aforementioned annular exhaust groove 212, thereby delivering external gas into the exhaust groove 212.

[0028] like Figure 2 As shown (the red arrow in the figure indicates the airflow direction), during laser processing, high-pressure gas supplied by the nozzle in the nozzle mounting hole 113 is ejected from the mounting hole 113, enters the exhaust hole 221 through the connecting air hole 22, and flows into the annular exhaust groove 212 through the exhaust hole 221. The gas is buffered and evenly distributed within the conical exhaust groove 212 before being ejected towards the lens. After being reflected by the lens, the airflow is ejected from the slot 213 located directly below the lens. This gas ejected from the slot 213 first covers the lower surface of the protective lens, forming a protective gas film tightly adhering to the lens. This gas film continuously blocks and removes contaminants attempting to adhere to the lens. This design effectively blows gas toward the lens through a gas flow channel formed by connecting the air hole 22, the air outlet 221, and the exhaust groove 212, without the need to install a separate air nozzle device below the lens. Therefore, it can effectively solve the defect of Bezier cutting heads that cannot directly and independently install air nozzles due to the extremely short distance between the protective lens and the workpiece surface. Subsequently, the gas continues to flow downwards and blows toward the processing area on the workpiece surface, playing an auxiliary role in blowing away molten material and cooling the processing point.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A short-working-distance laser cutting head nozzle, comprising a protective mirror knob (1), wherein a connecting groove (11) is provided on the upper surface of the protective mirror knob (1), characterized in that, Also includes: Mounting part (2) is fixedly installed in the connecting groove (11). The lens is fixedly installed in the mounting part (2). The jet nozzle in the protective lens knob (1) jets air to the lower surface of the lens through the airflow channel in the mounting part (2) to form an air film on the lower surface of the lens to protect the lens.

2. The short working distance laser cutting head nozzle according to claim 1, characterized in that, The upper end of the side wall of the connecting groove (11) is provided with a thread (112).

3. The short working distance laser cutting head nozzle according to claim 1, characterized in that, A through hole (111) is provided at the center of the lower surface of the connecting groove (11), and two air nozzle mounting holes (113) connecting the connecting groove (11) are symmetrically provided on the outer arc wall of the protective mirror knob (1).

4. The short working distance laser cutting head nozzle according to claim 1, characterized in that, The jet unit includes an air nozzle, which is fixedly installed in the air nozzle mounting hole (113).

5. The short working distance laser cutting head nozzle according to claim 1, characterized in that, The mounting part (2) includes a protective lens tube (21), which is fixedly installed in the connecting groove (11).

6. The short working distance laser cutting head nozzle according to claim 5, characterized in that, The upper surface of the protective lens tube (21) is provided with a lens mounting groove (211), and the lens is fixedly installed in the lens mounting groove (211). The lower surface of the lens mounting groove (211) is provided with an exhaust groove (212), which is a tapered structure that is wider at the top and narrower at the bottom. A slot hole (213) is provided through the center of the lower surface of the exhaust groove (212).

7. The short working distance laser cutting head nozzle according to claim 6, characterized in that, The airflow channel includes a number of connecting air holes (22) arranged in a ring array on the outer arc wall of the protective lens tube (21), and one end of the connecting air hole (22) is provided with an air outlet (221) that connects to the exhaust groove (212).

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