Multi-beam center-feed laser head

Abstract

This utility model relates to a multi-beam center-feed laser head, which includes a base, a wire feeding gun tube inserted at the center of the base, a wire feeding nozzle connected to the lower end of the wire feeding gun tube, and an air hole on the outer periphery of the bottom of the wire feeding gun tube. A protective gas channel is formed around the wire passing through the inner cavity of the wire feeding gun tube. An air cavity is formed around the lower section of the wire feeding gun tube at the center of the base, and the air cavity communicates with the air hole. The wire feeding gun tube can not only transport wire but also transport protective gas, eliminating the need for an additional protective gas pipeline in the laser head. It has a compact structure and is easy to install and maintain.

Description

Technical Field

[0001] This utility model relates to the field of laser equipment technology for additive manufacturing and repair / remanufacturing of metal parts, specifically to a multi-beam center-feeding laser head. Background Technology

[0002] The utility model patent CN208162612U discloses a coaxial composite multi-beam laser + electrothermal filament deposition equipment. Multiple laser beams, or multiple laser beams split from multiple lasers, are sequentially collimated and focused by a series of collimating-focusing lenses evenly distributed in a circle on the working head, and then converge onto the working head.

[0003] At the front of the laser head, the central axes of multiple mirror groups are evenly distributed on the same rotating conical surface with the wire centerline as the axis. A protective gas cylinder delivers inert gas to the heating electrode via a protective gas pipeline and blows it onto the substrate. This protective gas protects the molten pool formed on the substrate, improving the cladding quality. However, simultaneously incorporating wire feeding and protective gas pipelines inside the laser head complicates the structure and hinders manufacturing and assembly. Utility Model Content

[0004] The purpose of this invention is to provide a multi-beam center-feed laser head that optimizes the internal structure of the laser head and solves the problems mentioned above.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-beam center-feed laser head includes a base, a wire feeding gun barrel inserted at the center of the base, a wire feeding nozzle connected to the lower end of the wire feeding gun barrel, an air hole at the bottom of the wire feeding gun barrel in the outer peripheral direction, a protective gas channel formed around the wire material passing through the inner cavity of the wire feeding gun barrel, and an air cavity formed around the lower section of the wire feeding gun barrel at the center of the base, the air cavity communicating with the air hole.

[0007] Furthermore, the outer diameter of the wire feeding gun tube gradually decreases from top to bottom, and the base has an insertion hole at its center. The insertion hole includes a conical limiting section and an air chamber section. The wire feeding gun tube is tightly fitted with the conical limiting section. The air chamber section is spaced from the outer side of the wire feeding gun tube and from the outer side of the wire feeding nozzle to form the air chamber.

[0008] Furthermore, the upper part of the wire feeding gun barrel is connected to the upper side of the base through a pressure block.

[0009] Furthermore, the substrate is provided with a plurality of laser channels, each corresponding to a laser beam, and each laser channel is inclined and arranged around the wire feeding gun tube.

[0010] Furthermore, the substrate includes a cover plate, a lens section, and a tail section connected in sequence from top to bottom. The cover plate is provided with an optical fiber connector at the upper part of the laser channel. The lens section is provided with an optical processing lens group, which includes a collimating lens, a focusing lens, and a protective lens. The tail section is provided with a through hole at the center for the wire feed nozzle to pass through.

[0011] Furthermore, the substrate is also provided with a cooling water structure, including several water channels arranged around the wire feeding gun tube.

[0012] Furthermore, the water channel is disposed in the lens section, and a water channel is disposed between two adjacent laser channels. A connecting water trough is provided on the tail section, and the lower parts of two adjacent water channels are connected through the connecting water trough; one water channel is the main water outlet channel, and the other water channel is the main water inlet channel, and they are connected in series with the remaining water channels.

[0013] Furthermore, the connecting water tank is an arc-shaped tank, and the two water channels are respectively connected to the two ends of the connecting water tank to form a set of U-shaped channels.

[0014] Furthermore, the upper part of the main water outlet channel is connected to a main water outlet pipe connector, the upper part of the main water inlet channel is connected to a main water inlet pipe connector, and the upper parts of the remaining water channels are all connected to water pipe connectors.

[0015] Furthermore, the air holes are provided in a plurality of form and are distributed circumferentially along the wire feeding gun tube.

[0016] The beneficial effects of this utility model are:

[0017] (1) A vent is provided at the bottom of the wire feeding gun tube in the outer circumferential direction. A protective gas channel is formed around the wire passing through the inner cavity of the wire feeding gun tube. A gas cavity communicating with the vent is formed around the lower section of the wire feeding gun tube at the center of the substrate. There are gaps around the wire to allow the protective gas to pass through. The protective gas can be delivered by the wire feeding gun tube, thus eliminating the need for an additional protective gas pipeline in the laser head and simplifying the structure.

[0018] (2) By setting up multiple water channels to transport cooling water, the laser head in operation can be cooled down to protect internal components. Attached Figure Description

[0019] Figure 1 This is a 3D view of the entire multi-beam center-feeding laser head;

[0020] Figure 2 This is a cross-sectional view of a multi-beam center-feed laser head;

[0021] Figure 3 This is a cross-sectional view of the multi-beam center-feed laser head from another angle;

[0022] Figure 4It is a 3D view of the wire feed gun barrel;

[0023] Figure 5 This is a three-dimensional view of the head and tail of a multi-beam center-feeding laser head.

[0024] 1. Substrate; 11. Tail end; 111. Connecting water tank; 112. Second laser channel; 113. Through hole; 12. Lens section; 13. Cover plate section; 12. Lens section; 121. Water channel; 122. First laser channel; 123. Main water inlet channel; 21. Connector; 22. Wire feed gun barrel; 221. Air port; 24. Wire feed nozzle; 23. Pressure block; 31. Main water inlet pipe connector; 32. Main water outlet pipe connector; 33. Water pipe connector; 41. Fiber optic connector; 42. Lens tube; 43. Collimating lens; 44. Focusing lens; 45. Protective lens; 51. First air chamber; 52. Second air chamber; 6. Screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0026] Embodiments of this utility model:

[0027] like Figures 1-5 As shown, the multi-beam center-feed laser head includes a base 1, with a wire feeding gun barrel 22 inserted into the center of the base 1. A wire feeding nozzle 24 is connected to the lower end of the wire feeding gun barrel 22. The base 1 has a tapered structure that is wider at the top and narrower at the bottom. An insertion hole is provided in the center of the base 1, which is through the top and bottom. The upper part of the wire feeding gun barrel 22 is connected to the upper side of the base 1 by a pressure block 23. The upper part of the wire feeding gun barrel 22 has a shoulder. After the pressure block 23 is fitted onto the wire feeding gun barrel 22, it is pressed against the shoulder and then tightened with screws.

[0028] like Figure 2 and 4As shown, the bottom of the wire feeding tube 22 has several air holes 221 distributed circumferentially around its outer periphery. A protective gas channel is formed around the passing wire within the inner cavity of the wire feeding tube 22. An air cavity is formed around the lower section of the wire feeding tube 22 at the center of the base 1, and this air cavity communicates with the air holes 221. The inner cavity of the wire feeding tube 22, i.e., the through-hole 113, is larger than the outer diameter of the straightened wire being fed, creating a gap around the wire for the protective gas to pass through. The protective gas is supplied by the wire feeding tube 22, eliminating the need for an additional protective gas pipeline in the laser head and simplifying the structure. To facilitate gas intake, a three-way connector can be connected to the upper part of the wire feeding tube 22. This allows for the normal passage of the wire without affecting the wire, and the protective gas can be introduced through the other port of the three-way connector. A connector 21 is provided at the upper end of the wire feeding tube 22 for connection to other components.

[0029] The outer diameter of the wire feed gun barrel 22 gradually decreases from top to bottom. The insertion hole includes a tapered limiting section and a gas chamber section. After insertion, the wire feed gun barrel 22 fits tightly with the tapered limiting section. The tapered fit also achieves a sealing fit, allowing the protective gas to be delivered downwards. The gas chamber section is spaced from the outer side of the wire feed gun barrel 22 and from the outer side of the wire feed nozzle 24 to form the gas chamber. After the protective gas exits from the gas hole 221 of the wire feed gun barrel 22, it enters this gas chamber. In actual use, the protective gas can cover the molten pool area on the workpiece, providing protection. The protective gas is an inert gas.

[0030] The inner diameter of the wire feed nozzle 24 is smaller than the through-hole diameter of the wire feed gun tube 22, and the inner diameter of the wire feed nozzle 24 is matched with the outer diameter of the wire.

[0031] The substrate 1 has several laser channels, each corresponding to a laser beam. These laser channels are angled and arranged around the wire feeding nozzle 22. In this embodiment, six laser channels are provided, evenly distributed along the circumference. During use, the six laser beams can be focused directly below the wire feeding nozzle 24, corresponding to the end of the wire, and the high temperature of the laser beams melts the wire.

[0032] The substrate 1 includes a cover plate portion 13, a lens portion 12, and a tail portion 11 connected sequentially from top to bottom. An optical fiber connector 41 is provided on the upper part of the laser channel on the cover plate portion 13. The cover plate portion 13 is connected to the upper side of the lens portion 12 by screws.

[0033] like Figure 3As shown, the lens section 12 is equipped with a light processing lens assembly, which includes a collimating lens 43, a focusing lens 44, and a protective lens 45. Its function is the same as in the prior art: the laser beam is collimated by the collimating lens 43, then focused by the focusing lens 44, and the protective lens 45 provides protection. The collimating lens 43, focusing lens 44, and protective lens 45 can be modularly designed and inserted into the lens section 12 as a whole; alternatively, the collimating lens 43 and focusing lens 44 can be modularly designed, such as... Figure 3 As shown, the collimating lens 43 and the focusing lens 44 are mounted on the lens tube 42, and the protective lens 45 is installed separately from the side of the lens section 12. A section of the lens section 12 is provided with a laser channel, which is referred to as the first laser channel 122.

[0034] like Figure 2 As shown, the cavity between the wall of the central through hole 113 of the lens section 12 and the wire feed gun barrel 22 is designated as the first air chamber 51, which is part of the aforementioned air chamber section.

[0035] like Figure 2 As shown, the tail portion 11 has a through hole 113 at its center for the wire feeding nozzle 24 to pass through. The cavity between the wall of the through hole 113 and the wire feeding nozzle 24 is called the second air cavity 52, which is another part of the aforementioned air cavity section.

[0036] The tail section 11 is connected to the bottom of the lens section 12 by a screw 6 that passes through from bottom to top. The tail section 11 has a countersunk hole at the position corresponding to the screw 6 so that the screw 6 does not protrude.

[0037] The tail section 11 has another section of laser channel, referred to as the second laser channel 112. The first laser channel 122 and the second laser channel 112 are connected to form a laser channel.

[0038] The substrate 1 is also provided with a cooling water structure for cooling the laser head, including several water channels arranged around the wire feeding gun tube 22.

[0039] Water channels are provided in the lens section 12, with one water channel between two adjacent laser channels. A connecting water tank 111 is provided on the tail section 11, and the lower parts of two adjacent water channels are connected through the connecting water tank 111. In this embodiment, there are a total of six water channels and three connecting water tanks 111. For ease of understanding of the cooling water structure, one water channel is a main water outlet channel, one water channel is a main water inlet channel 123, and they are connected in series with the remaining water channels.

[0040] The connecting water tank 111 is an arc-shaped tank. Two water channels are respectively connected to the two ends of the connecting water tank 111 to form a set of U-shaped channels. The connecting water tank 111 realizes the connection of the bottom of the water channels.

[0041] The upper part of the main water outlet channel is connected to a main water outlet pipe connector 32, the upper part of the main water inlet channel 123 is connected to a main water inlet pipe connector 31, and the upper parts of the remaining water channels are all connected to water pipe connectors 33, that is, there are four water pipe connectors 33. The two adjacent water pipe connectors are connected in series through a connecting pipe (two connecting pipes are required in total). The final cooling water structure is a serpentine pipe structure with one inlet and one outlet. The water channels are evenly distributed around the periphery of the wire feeding gun tube 22. Specifically, the cooling water enters the main water inlet channel 123 from the main water inlet pipe connector 31, enters the adjacent water channel after passing through the first connecting water tank, and then enters the second connecting water tank downward through another water channel adjacent to the first water channel, and so on. Finally, the cooling water flows out from the main water outlet channel and the main water outlet pipe connector 32.

Claims

1. A multi-beam center-fed wire laser head, characterized in that: The device includes a substrate, a wire feeding gun barrel inserted at the center of the substrate, a wire feeding nozzle connected to the lower end of the wire feeding gun barrel, an air hole at the bottom of the wire feeding gun barrel in the outer peripheral direction, a protective gas channel formed around the wire passing through the inner cavity of the wire feeding gun barrel, and an air cavity formed around the lower section of the wire feeding gun barrel at the center of the substrate, the air cavity communicating with the air hole.

2. The multi-beam center-fed wire laser head of claim 1, wherein: The outer diameter of the wire feeding gun barrel gradually decreases from top to bottom. The base has an insertion hole at its center, which includes a conical limiting section and an air chamber section. The wire feeding gun barrel is tightly fitted with the conical limiting section. The air chamber section is spaced from the outer side of the wire feeding gun barrel and from the outer side of the wire feeding nozzle to form the air chamber.

3. The multi-beam center-fed wire-fed laser head of claim 1, wherein: The upper part of the wire feeding gun barrel is connected to the upper side of the base through a pressure block.

4. The multi-beam center-fed wire laser head of claim 2, wherein: The substrate has several laser channels, each corresponding to a laser beam. Each laser channel is inclined and arranged around the wire feeding gun tube.

5. The multi-beam center-fed wire laser head of claim 4, wherein: The substrate includes a cover plate, a lens section, and a tail section connected in sequence from top to bottom. The cover plate has an optical fiber connector at the top of the laser channel. The lens section has an optical processing lens group, which includes a collimating lens, a focusing lens, and a protective lens. The tail section has a through hole at the center for the wire feed nozzle to pass through.

6. The multi-beam center-fed wire laser head of claim 5, wherein: The substrate is also provided with a cooling water structure, including several water channels arranged around the wire feeding gun tube.

7. The multi-beam center-fed wire laser head of claim 6, wherein: The water channel is located in the lens section, and one water channel is provided between two adjacent laser channels. A connecting water trough is provided on the tail section, and the lower parts of two adjacent water channels are connected through the connecting water trough. One water channel is the main water outlet channel, and the other water channel is the main water inlet channel, and they are connected in series with the remaining water channels.

8. The multi-beam center-fed wire laser head of claim 7, wherein: The connecting water tank is an arc-shaped tank, and two water channels are respectively connected to the two ends of the connecting water tank to form a set of U-shaped channels.

9. The multi-beam center-fed wire laser head of claim 7, wherein: The upper part of the main water outlet channel is connected to a main water outlet pipe connector, the upper part of the main water inlet channel is connected to a main water inlet pipe connector, and the upper parts of the other water channels are all connected to water pipe connectors.

10. The multi-beam center-fed wire laser head of claim 1, wherein: The air holes are provided in a plurality of form and are distributed along the circumference of the wire feeding gun tube.

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