CN211665179U - Paraxial powder feeding device - Google Patents

Abstract

The utility model discloses a paraxial powder feeding device, which belongs to the technical field of laser additive manufacturing, wherein the included angle between the laser beam direction and the powder feeding direction of the powder feeding cavity is 5-45 degrees, the laser beam direction in the included angle range is matched with the powder feeding direction of the powder feeding cavity to ensure that most of the energy of the laser beam is used for heating, melting and accelerating the powder particles in flight, only a very small amount of light beam energy can heat a basal body, thereby avoiding the basal body from being overheated to greatly reduce the dilution rate, reducing the deformation and dilution rate of the basal body, greatly improving the powder utilization rate and the processing efficiency, ensuring that the effective components of a coating are not influenced by the basal body material to improve the corrosion-resistant and wear-resistant effects of the coating, and the laser beam direction in the included angle range is matched with the powder feeding direction of the powder feeding cavity to realize laser ultra-high-speed cladding processing and form a coating with strong metallurgical bonding on the surface of the basal, the bonding strength between the coating and the base material and the laser cladding efficiency are improved.

Description

A side shaft powder feeding device

technical field

The utility model relates to the technical fields of laser additive manufacturing, laser cladding and laser thermal spraying, in particular to a side shaft powder feeding device.

Background technique

Most of the core key components of modern high-end equipment are moving parts. Wear, corrosion, fatigue and other reasons cause frequent damage or even failure of core key components, threatening the long-term reliable operation of the equipment, and causing a large number of expensive core key components to be scrapped, thus Cause huge economic losses, waste of resources and waste of energy.

On the one hand, the traditional wear-resistant and corrosion-resistant nickel-based alloy coating preparation equipment has the characteristics of large size, high hardness and high melting point of the nickel-based powder used. During the coating preparation process, there is a problem of poor melting of powder particles, which leads to The coating has shortcomings such as easy cracking and low density, which cannot meet the production needs.

On the other hand, traditional coating processing equipment has problems such as low heat input control accuracy, low processing efficiency and serious pollution, which lead to excessive heating of the substrate and serious deformation, resulting in serious cracking of the prepared nickel-based alloy coating. As a result, the corrosion resistance and wear resistance are deteriorated. Therefore, it is urgent to provide a new process for preparing nickel-based material coatings to meet actual production needs and solve the problem that the nickel-based alloy coating has a large cracking tendency during the preparation process, which leads to deterioration of wear and corrosion resistance.

However, the laser spraying equipment commonly used in the market at present, whether it is coaxial powder feeding or paraxial powder feeding, is essentially a light-external powder feeding in which powder is wrapped with a laser. Due to the short action time of the laser and the powder due to the external powder feeding, there will be problems such as the processing accuracy of the powder feeding nozzle and the low utilization rate of the powder.

SUMMARY OF THE INVENTION

The utility model provides a side-axis powder feeding device, which can realize the convergence of powder at the center point of the light spot by optimizing the angle between the powder feeding cavity and the beam cavity, so that most of the energy of the laser beam is used for heating, melting and accelerating the powder in flight particles, and can realize ultra-high-speed laser cladding to form a metallurgical bonding coating, which avoids the excessive heating of the substrate and greatly reduces the dilution rate, reduces the deformation and dilution rate of the substrate, and can greatly improve the powder utilization rate and processing efficiency. The effective components of the coating are not affected by the matrix material, thereby improving the corrosion and wear resistance of the coating.

The concrete technical scheme that the utility model provides is as follows:

A side shaft powder feeding device provided by the present utility model comprises a device body and a connecting device fixed on the device body, wherein the connecting device is used to fix the side shaft powder feeding device with other components, so the The device body is provided with a powder feeding cavity, and the included angle between the powder feeding cavity and the vertical surface is 5° to 45°.

It can be followed that a laser beam channel with an inverted conical structure is arranged on the device body, and the powder feeding cavity is arranged on one side of the laser beam channel, and the powder feeding cavity is connected with the laser beam channel. The included angle between them is 5°-45°; the powder feeding cavity is a columnar structure and the converging point of the cross-sectional centerline of the powder feeding cavity and the cross-sectional centerline of the laser beam channel is in the same plane.

Optionally, the cross section of the laser beam channel is a semi-circular structure or a semi-square structure, and the powder feeding cavity includes a plurality of cylindrical powder feeding tubes arranged side by side.

Optionally, the total number of the cylindrical powder feeding tubes is an odd number, the cylindrical powder feeding tube located in the middle position is the central powder feeding tube, and the cylindrical powder feeding tubes located on both sides of the central powder feeding tube. It is a side powder feeding tube, and the distance between the outlet of the side powder feeding tube and the outlet of the central powder feeding tube is smaller than that between the inlet of the side powder feeding tube and the inlet of the central powder feeding tube the distance.

Optionally, the included angle between the center line of the side powder feeding pipe and the center line of the central powder feeding pipe is 5°˜30°.

Optionally, the cylindrical powder feeding pipe is composed of four cylindrical pipe assemblies with different diameters, and the diameters of the cylindrical pipes decrease sequentially from top to bottom.

Optionally, the device body includes a device center body and a side cover fixed on one side of the device center body, wherein the powder feeding cavity is distributed along the splicing surface between the side cover and the device center body. .

Optionally, the cylindrical powder feeding tube is of a spliced and split structure, and the cylindrical powder feeding tube includes a left tube body and a right tube body that are spliced and matched with each other, wherein the left tube body is located in the central body of the device. Opposite to the end face of the side cover, the right pipe body is located at the end face of the side cover opposite to the central body of the device.

Optionally, a cooling cavity is provided on the outer side of the powder feeding cavity, the connecting device is provided on the upper end of the device body, and a connecting flange is provided on the connecting device, and the connecting flange is used for connecting with the powder. Other components are fixed, and the laser beam channel runs through the device body and the connecting device.

Optionally, a cooling cavity cover is fixed on the side of the device body, the cooling cavity cover and the device body cooperate with each other to form the cooling cavity, the cooling cavity cover is provided with a cooling pipe installation hole, and the connection The device includes a base fixed on the device body, a connecting flange fixed on the base, and end covers respectively fixed on the device body and the cooling chamber cover, and the end covers are provided with powder feeding A head mounting hole, the powder feeding head mounting hole is communicated with the cylindrical powder feeding pipe.

The beneficial effects of the present utility model are as follows:

An embodiment of the present utility model provides a paraxial powder feeding device comprising a device body and a connecting device fixed on the device body, wherein the device body is provided with a laser beam channel in an inverted conical structure, on one side of the laser beam channel A powder feeding cavity is provided, and the included angle between the powder feeding cavity and the laser beam channel is 5°～45°, that is, the included angle between the laser beam direction and the powder feeding direction of the powder feeding cavity is 5°～45°. The laser beam direction within this angle range and the powder feeding direction of the powder feeding cavity cooperate with each other, so that most of the energy of the laser beam is used to heat, melt and accelerate the powder particles in flight, and only a very small amount of beam energy will heat the substrate, avoiding The substrate is overheated and the dilution rate is greatly reduced, the deformation amount and dilution rate of the substrate are reduced, the powder utilization rate and processing efficiency can be greatly improved, and the effective components of the coating are not affected by the substrate material, thereby improving the resistance of the coating. In addition, the direction of the laser beam within this angle range and the powder feeding direction of the powder feeding cavity can achieve ultra-high-speed laser cladding processing and form a coating with strong metallurgical bonding on the surface of the substrate, improving the coating and Bond strength and laser cladding efficiency between substrates.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present invention. For example, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is an isometric side structural schematic diagram of a side shaft powder feeding device according to an embodiment of the present utility model;

Fig. 2 is another equiaxed structural schematic diagram of a side shaft powder feeding device according to an embodiment of the present utility model;

3 is a schematic front view of the structure of a side shaft powder feeding device according to an embodiment of the present utility model;

Fig. 4 is a bottom view structural schematic diagram of a side shaft powder feeding device according to an embodiment of the present utility model;

Fig. 5 is the front view structure schematic diagram of a kind of side shaft powder feeding device according to the embodiment of the utility model;

Fig. 6 is a top-view structural schematic diagram of a side shaft powder feeding device according to an embodiment of the present utility model;

FIG. 7 is a schematic view of the cross-sectional structure along the line A-A in FIG. 6 according to an embodiment of the present utility model;

FIG. 8 is a schematic view of the cross-sectional structure along the line B-B in FIG. 6 according to an embodiment of the present utility model;

9 is a schematic front view of a device body according to an embodiment of the present invention;

10 is a schematic top-view structure diagram of a device body according to an embodiment of the present invention;

FIG. 11 is a schematic view of the cross-sectional structure along the C-C direction in FIG. 9 according to an embodiment of the present utility model;

FIG. 12 is a schematic view of the cross-sectional structure along the D-D direction in FIG. 10 according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

A side shaft powder feeding device according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 12 .

Referring to Figures 1, 2 and 3, a side shaft powder feeding device provided by an embodiment of the present invention includes a device body 1 and a connecting device 2 fixed on the device body 1, wherein the connecting device 2 is used to The side shaft powder feeding device of the embodiment of the present invention is fixed with other components. For example, the device body 1 of the side shaft powder feeding device of the embodiment of the present invention is fixed to the laser cladding device or the laser spray melting equipment through the connecting device 2 superior.

Referring to Fig. 1, Fig. 6 and Fig. 7, the device body 1 is provided with a laser beam channel 3 with an inverted conical structure, and a powder feeding cavity 4 is provided on one side of the laser beam channel 3. The powder feeding cavity 4 is connected to the laser beam. The included angle between the beam channels 3 is 5°˜45°. Specifically, the included angle between the powder feeding cavity 4 and the laser beam channel 3 can be the included angle a shown in FIG. The included angle a can also be the included angle between the center line of the powder feeding cavity 4 and the vertical plane where the laser beam channel 3 is located. A large number of experiments and practices show that only when the angle between the powder feeding cavity 4 and the laser beam channel 3 is 5° to 45° can the range-axis powder feeding device be used to achieve ultra-high-speed laser cladding.

Referring to FIGS. 7 , 9 , 11 and 12 , the powder feeding cavity 4 in the embodiment of the present invention is a columnar structure, and the cross-sectional centerline of the powder feeding cavity 4 and the cross-sectional centerline of the laser beam channel 3 are convergent points. in the same plane. 1 , 4 , 6 , 7 , 9 , 11 and 12 , the powder feeding chamber 4 is composed of a plurality of cylindrical powder feeding pipes 401 arranged side by side. The powder feeding tubes 401 are all inclined in the vertical direction, and the laser beam channels are vertically arranged in the vertical direction, and the central axis of each cylindrical powder feeding tube 401 will be aligned with the central axis plane of the laser beam channel 3 . intersect, and the intersections between the central axis of all cylindrical powder feeding tubes and the central axis of the laser beam channel are in the same horizontal plane, that is, the central axis of all cylindrical powder feeding tubes and the central axis of the laser beam channel. The intersection point between them forms a cake-like structure in the same horizontal plane, which can form a powder cake coating at the convergence point of the beam in the laser beam channel, and the powder cake formed at the outlet of the powder feeding cavity has a certain diameter and can be concentrated in the laser beam. The top of the point converges with the laser beam, so that the laser beam contacts the powder before reaching the surface of the substrate, ensuring that most of the energy of the laser beam is used to heat, melt and accelerate the powder particles in flight, and only a very small amount of beam energy will heat the substrate. The substrate is overheated and the dilution rate is greatly reduced, the deformation amount and dilution rate of the substrate are reduced, the powder utilization rate and processing efficiency can be greatly improved, and the effective components of the coating are not affected by the substrate material, thereby improving the resistance of the coating. Anti-wear effect.

Illustratively, as shown in FIGS. 7 , 8 , 9 and 12 , the cross-section of the device body 1 is a semi-sector structure, wherein the centerline of the cross-section of the powder feeding chamber 4 (that is, each cylindrical powder feeding tube) The central axis of the laser beam channel 3 (that is, the intersection between the central axis plane in the width direction of the laser beam channel and the central axis plane in the width direction) and the cross-sectional center line of the laser beam channel 3 are respectively different from the circle where the fan-shaped structure is located. The radius lines coincide, that is, the powder feeding cavity 4 and the laser beam channel 3 are arranged along the radial direction of the circle where the fan-shaped structure is located, and regardless of the number of powder feeding tubes distributed in the powder feeding cavity 4 along the width direction of the laser beam channel 3 and the laser beam No matter how the width of the beam channel 3 changes, it can ensure that the converging point of the laser beam and the converging point of the powder feeding cavity are distributed in the same plane, but the powder cake formed by the outlet of the powder feeding cavity has a certain diameter and can be above the converging point of the laser beam. Convergence with the laser beam so that the laser beam contacts the powder cake before reaching the surface of the substrate, ensuring that most of the energy of the laser beam is used to heat, melt and accelerate the powder particles in flight, and only a very small amount of beam energy will heat the substrate, preventing the substrate from being damaged. Overheating greatly reduces the dilution rate, reduces the deformation of the substrate and the dilution rate, which can greatly improve the powder utilization rate and processing efficiency, and ensure that the effective components of the coating are not affected by the matrix material, thereby improving the corrosion resistance and wear resistance of the coating. Effect.

Referring to Figure 1, Figure 2, Figure 3, Figure 8 and Figure 9, the cross section of the laser beam channel 3 is a semi-circular structure or a semi-square structure, that is, the laser beam channel 3 is an open semi-opening structure. The beams can converge down to a point along the inner wall of the laser beam channel 3 . The main body of the cylindrical powder feeding tube 401 may be a cylindrical powder feeding tube or a prismatic powder feeding tube. For example, the cylindrical powder feeding tube 401 may have a triangular prism or a quadrangular prism structure, which is not limited in the embodiment of the present invention. However, the cross-sectional shape of the main body of the cylindrical powder feeding tube 401 is the same, that is to say, it is necessary to ensure that the part of the cylindrical powder feeding tube 401 close to the laser beam converging point needs to be evenly distributed in its length direction to ensure that the powder reaches the laser beam. The beam is evenly circulated before the convergence point.

Referring to FIGS. 1 , 2 , 3 , 8 , 9 and 10 , the laser beam channel 3 of the embodiment of the present invention is a conical structure arranged upside down, wherein the taper of the laser beam channel is 1:10 ~1:5, preferably, the taper of the laser beam channel is 15:114, wherein the taper refers to the ratio between the difference between the radius of the large end and the radius of the small end and the height. Under this taper, the interaction time between the laser beam and the powder cake is the longest, the utilization rate of the powder is the highest, the dilution rate of the matrix is the lowest, and the metallurgical bonding strength of the coating layer is the highest.

1, 2, 3, 9, 10, 11 and 12, the total number of cylindrical powder feeding tubes 401 in the embodiment of the present invention is odd, and the cylindrical powder feeding tubes 401 are located in the middle position is the central powder feeding tube 4011, the cylindrical powder feeding tubes located on both sides of the central powder feeding tube 4011 are the side powder feeding tubes 4012, and the distance between the outlet of the side powder feeding tube 4012 and the outlet of the central powder feeding tube 4011 It is smaller than the distance between the inlet of the side powder feeding tube 4012 and the inlet of the central powder feeding tube 4011, that is, the powder output directions of the multiple cylindrical powder feeding tubes 401 arranged side by side converge to the center position, thereby ensuring the powder feeding cavity. powder feeding effect. Referring to Fig. 11, the included angle b between the center line of the side powder feeding tube 4012 and the center line of the central powder feeding tube 4011 is 5° to 30°, and the powder feeding cavity within this angle range has the best The convergence effect, combined with the angle between the powder feeding cavity and the laser beam channel, can ensure the spraying effect of ultra-high-speed laser cladding.

Referring to Figure 4, Figure 7, Figure 8, Figure 9, Figure 11 and Figure 12, the cylindrical powder feeding pipe 401 of the embodiment of the present utility model is composed of four cylindrical pipe assemblies with different diameters, and is assembled from the top. The diameter of the downward cylindrical tube decreases in sequence, and the cylindrical tube with the smallest diameter has the longest length.

1 , 2 , 3 , 6 and 7 , the side shaft powder feeding device according to the embodiment of the present invention is provided with a cooling cavity 5 on the outer side of the device body 1 , and the cooling cavity 5 is in an oblique rectangular shape. The side wall of the rectangular inner cavity is provided with a cooling liquid circulation pipe installation hole 6, and the cooling liquid circulation pipe installation hole 6 is used to install the cooling liquid circulation pipe to realize the rapid cooling of the side shaft powder feeding device of the embodiment of the present invention.

Referring to FIGS. 1 to 12 , in order to reduce the processing difficulty of the device body, the side shaft powder feeding device provided by the embodiment of the present invention adopts a split structure that is spliced and fixed with each other. Specifically, referring to FIG. 1 , FIG. 3 , FIG. 4 , FIG. 6 , FIG. 7 , FIG. 8 , FIG. 9 , FIG. 10 , FIG. 11 and FIG. 12 , the device body 1 provided by the embodiment of the present invention includes a device center body 101 and a side cover 102 fixed on one side of the central body 101 of the device, wherein the powder feeding cavity 4 is distributed along the splicing surface between the side cover 102 and the central body 101 of the device.

9 , 10 , 11 and 12 , after the center body 101 and the side cover 102 of the embodiment of the present invention are processed separately, they can be fixed to each other with screws or bolts. At the same time, the use of the device body 1 of the split structure is to reduce the processing difficulty of the powder feeding cavity formed by the cylindrical powder feeding tube 401 . Referring to Fig. 7, Fig. 9, Fig. 10, Fig. 11 and Fig. 12, the cylindrical powder feeding pipe 401 is a spliced and split structure, and the cylindrical powder feeding pipe 401 includes a left pipe body 4013 and a right pipe body 4014 which are spliced and matched with each other. , wherein the left pipe body 4013 is located on the end face of the device center body 101 opposite to the side cover 102 , and the right pipe body 4014 is located on the end face of the side cover 102 opposite the device center body 101 .

That is, as shown in FIGS. 7 , 8 , 9 , 10 , 11 and 12 , the cylindrical powder feeding tube 401 is divided into left and right parts that are spliced and matched with each other, and can be placed on the splicing surface of the central body 101 of the device. Half of the cylindrical powder feeding tube 401 is processed, and the remaining part of the cylindrical powder feeding tube 401 is processed on the splicing surface of the side cover, and then a complete cylindrical powder feeding tube 401 is formed after splicing each other. Since the cylindrical powder feeding tube 401 is a thin tube set at an inclination, if the splicing structure is not used, it is extremely difficult to process, and even a qualified cylindrical powder feeding tube cannot be processed. The split processing of the cylindrical powder feeding tube can greatly reduce the processing difficulty of the cylindrical powder feeding tube and improve the machining accuracy of the cylindrical powder feeding tube.

Referring to Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, the side shaft powder feeding device of the embodiment of the present invention adopts the top mounting and fixing method, and the connecting device 2 is arranged on the upper end of the device body 1, that is, the connecting device 2 is connected. The device 2 is fixed on the upper part of the device body 1, wherein the connecting device 2 can be integrally formed with the device central body 101 or processed separately, and the connecting device 2 can be fixed on the upper part of the device central body 101 by welding or using screw connection or bolt connection It is fixed on the central body 101 of the device. Referring to FIGS. 1 , 2 , 7 and 8 , the connecting device 2 is provided with a connecting flange 201 , and the connecting flange 201 is used for fixing with other components, and the laser beam channel 3 penetrates the device body 1 and the connecting device 2 .

Referring to FIGS. 1 , 7 and 8 , a cooling chamber 5 is provided on the outside of the powder feeding chamber 4 , a cooling chamber cover 501 is fixed on the side of the device body 1 , and the cooling chamber 5 is the mutual relationship between the cooling chamber cover 501 and the device body 1 . Referring to FIG. 1 and FIG. 7 for the cooling liquid circulation space formed by splicing, the cooling chamber cover 501 is fixed on the device body 1 by bolts or screws, which can reduce the processing difficulty of the cooling chamber. Exemplarily, the left cooling cavity 5 is a rectangular cavity. The connecting device 2 includes a base 202 fixed on the device body, a connecting flange 201 fixed on the base 202, an end cover 203 fixed on the device body 1 and the cooling chamber cover 501 respectively, and the end cover 203 is provided with a powder feeding head The mounting hole 204, the powder feeding head mounting hole 204 is communicated with the cylindrical powder feeding pipe 401. The powder feeding head mounting hole 204 is used to install and connect the external powder feeding head. The external powder feeding head 7 can be installed in the powder feeding head mounting hole 204 by screw connection.

An embodiment of the present utility model provides a paraxial powder feeding device comprising a device body and a connecting device fixed on the device body, wherein the device body is provided with a laser beam channel in an inverted conical structure, on one side of the laser beam channel A powder feeding cavity is provided, and the included angle between the powder feeding cavity and the laser beam channel is 5°～45°, that is, the included angle between the laser beam direction and the powder feeding direction of the powder feeding cavity is 5°～45°. The laser beam direction within this angle range and the powder feeding direction of the powder feeding cavity cooperate with each other, so that most of the energy of the laser beam is used to heat, melt and accelerate the powder particles in flight, and only a very small amount of beam energy will heat the substrate, avoiding The substrate is overheated and the dilution rate is greatly reduced, the deformation amount and dilution rate of the substrate are reduced, the powder utilization rate and processing efficiency can be greatly improved, and the effective components of the coating are not affected by the substrate material, thereby improving the resistance of the coating. In addition, the direction of the laser beam within this angle range and the powder feeding direction of the powder feeding cavity can achieve ultra-high-speed laser cladding processing and form a coating with strong metallurgical bonding on the surface of the substrate, improving the coating and Bond strength and laser cladding efficiency between substrates.

The embodiment of the present invention provides a paraxial powder feeding device. Since the laser beam channel is an open structure, the laser beam is not confined in the channel, and the laser beam channel only provides a guiding function for the laser beam, which is relatively The beam can realize powder feeding at any angle, not only ultra-high-speed laser cladding, but also ordinary laser cladding, with flexible working methods and wide adaptability.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present utility model fall within the scope of the claims of the present utility model and their equivalents, the present utility model is also intended to include these modifications and variations.

Claims (10)

1. The paraxial powder feeding device is characterized by comprising a device body and a connecting device fixed on the device body, wherein the connecting device is used for fixing the paraxial powder feeding device with other components, a powder feeding cavity is arranged on the device body, and an included angle between the powder feeding cavity and a vertical surface is 5-45 degrees.

2. The paraxial powder feeding device according to claim 1, wherein the device body is provided with a laser beam channel having an inverted conical structure, the powder feeding cavity is arranged on one side of the laser beam channel, and an included angle between the powder feeding cavity and the laser beam channel is 5-45 degrees; the powder feeding cavity is of a cylindrical structure, and the convergence point of the section center line of the powder feeding cavity and the section center line of the laser beam channel is in the same plane.

3. The paraxial powder feeding device according to claim 2, wherein the cross section of the laser beam channel has a semicircular structure or a semi-square structure, and the powder feeding chamber comprises a plurality of cylindrical powder feeding pipes arranged side by side.

4. The paraxial powder feeding device according to claim 3, wherein the total number of the cylindrical powder feeding pipes is an odd number, the cylindrical powder feeding pipe located at the middle position is a central powder feeding pipe, the cylindrical powder feeding pipes located at both sides of the central powder feeding pipe are side powder feeding pipes, and the distance between the outlet of the side powder feeding pipe and the outlet of the central powder feeding pipe is smaller than the distance between the inlet of the side powder feeding pipe and the inlet of the central powder feeding pipe.

5. The paraxial powder feed apparatus of claim 4 wherein the angle between the centerline of the lateral powder feed tube and the centerline of the central powder feed tube is between 5 ° and 30 °.

6. The paraxial powder feeding apparatus as claimed in claim 3, wherein the cylindrical powder feeding tube is composed of 4 sections of cylindrical tube assemblies each having a different diameter, and the diameters of the cylindrical tubes decrease from top to bottom in order.

7. The paraxial powder feed device of claim 3 wherein the device body comprises a device central body and a side cover fixed to one side of the device central body, wherein the powder feed cavities are distributed along a splicing plane between the side cover and the device central body.

8. The paraxial powder feed device of claim 7, wherein the cylindrical powder feed tube is a split structure, and comprises a left tube and a right tube which are matched with each other, wherein the left tube is located on the end surface of the device central body opposite to the side cover, and the right tube is located on the end surface of the side cover opposite to the device central body.

9. The paraxial powder feeder according to claim 7, wherein a cooling chamber is provided outside the powder feeding chamber, the connecting device is provided at an upper end of the feeder body, the connecting device is provided with a connecting flange for fixing with other parts, and the laser beam passage penetrates through the feeder body and the connecting device.

10. The paraxial powder feeding device according to claim 9, wherein a cooling chamber cover is fixed to a side surface of the device body, the cooling chamber cover and the device body are matched with each other to form the cooling chamber, a cooling pipe mounting hole is formed in the cooling chamber cover, the connecting device comprises a base fixed to the device body, a connecting flange fixed to the base, and end covers fixed to the device body and the cooling chamber cover respectively, a powder feeding head mounting hole is formed in the end covers, and the powder feeding head mounting hole is communicated with the cylindrical powder feeding pipe.

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