A gas-borne double-gas-path ring-shaped powder feeding nozzle for laser cladding

Abstract

The application discloses a gas-borne double-gas-path ring-shaped powder feeding nozzle for laser cladding, which comprises a fixed ring, a first gas path is formed in the middle of the upper end of the fixed ring, a second gas path is formed on one side of the first gas path, a sink groove is formed in the lower end of the fixed ring, a shunt ring is arranged in the sink groove, the shunt ring is connected with the sink groove through threads, a feeding head is arranged on the upper end of the shunt ring, the feeding head is matched with the first gas path, a feeding channel is formed in the corresponding position of the first gas path, a groove is formed on the upper surface of the shunt ring, a plurality of protective gas paths are formed in the groove and around the feeding head, and the second gas path is located directly above the groove. The application can form a ring-shaped gas around the cladding material, can improve the effective distance of the cladding material cluster jet, can improve the distance between the powder feeding nozzle and the welding base material, can reduce the heat radiation, and can avoid the powder feeding nozzle from being blocked due to heat.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser cladding welding, and particularly relates to a gas-borne double-gas-path ring-shaped powder feeding nozzle for laser cladding. BACKGROUND

[0002] Laser cladding welding is a new surface modification technology. It forms a cladding layer on the surface of a base material by adding cladding material to the surface of the base material and melting the cladding material and a thin layer of the base material together by using a high-energy-density laser beam.

[0003] The powder feeding nozzle in laser cladding is a device for spraying cladding material onto the surface of a base material. The gas-borne powder feeding nozzle drives the cladding material by gas, and the gas and the cladding material are sprayed onto the surface of the base material to uniformly distribute the cladding material on the surface of the base material. The traditional gas-borne powder feeding nozzle drives the cladding material by gas to spray the cladding material out of the powder feeding nozzle, and the cladding material is clustered. However, in order to ensure uniform welding, the effective cladding material cluster length is 10 mm. If the cladding material cluster length exceeds 10 mm, the cladding material will excessively spread, affecting the welding effect. As a result, the powder feeding nozzle is close to the welding surface, and the powder feeding nozzle is more easily affected by heat radiation, which easily melts the cladding material in the powder feeding nozzle, thereby blocking the powder feeding nozzle. SUMMARY

[0004] The purpose of the present application is to provide a gas-borne double-gas-path ring-shaped powder feeding nozzle for laser cladding to solve the problems of the traditional gas-borne powder feeding nozzle, the powder feeding distance of 10 mm, the close distance between the powder feeding nozzle and the base material, the greater heat radiation of the powder feeding nozzle, the melting of the cladding material in the powder feeding nozzle, and the blocking of the powder feeding nozzle.

[0005] The present application achieves the above-mentioned purpose by the following technical scheme: a fixed ring is provided, a first gas path is formed in the middle of the upper end of the fixed ring, a second gas path is formed on one side of the first gas path, a sink is formed in the lower end of the fixed ring, a shunt ring is arranged in the sink, the shunt ring is connected with the sink through threads, a feeding head is arranged on the upper end of the shunt ring, the feeding head is matched with the first gas path, a feeding channel is formed in the shunt ring at the corresponding position of the first gas path, a groove is formed on the upper surface of the shunt ring, a plurality of protection gas paths are formed in the groove and around the feeding head, the second gas path is located directly above the groove, a powder feeding pipe is arranged at the lower end of the feeding channel, the powder feeding pipe is connected with the feeding channel through threads, a protective sleeve is arranged around the powder feeding pipe, the protective sleeve is connected with the lower end of the shunt ring through threads, and an air outlet is formed in the protective sleeve at the corresponding position of the powder feeding pipe.

[0006] Further, the upper ends of the first gas path and the second gas path are connected with copper pipes.

[0007] Further, the upper end of the feeding head is inversely right-angled, and the first gas path is inversely right-angled at the corresponding position of the feeding head.

[0008] Further, the middle outer diameter surface of the powder feeding pipe is hexagonal.

[0009] Further, the inner diameter size of the air outlet hole is greater than the outer diameter size of the lower end of the powder feeding pipe.

[0010] Beneficial effects: the present application has the following beneficial effects due to its reasonable design, simple and stable structure and strong practicability:

[0011] 1. The gas drives the cladding material to come down from the first gas path, enter the powder feeding pipe through the feeding channel, and aim at the base material, so that the cladding material can be sprayed to the outer surface of the base material.

[0012] 2. The second gas path is ventilated, uniformly enters between the protective sleeve and the powder feeding pipe through the protection gas path on the groove, and is discharged from the air outlet hole, so that an annular air cluster is formed around the cladding material cluster sprayed from the powder feeding pipe, which can guide and accelerate the cladding material, improve the effective length of the cladding material cluster to 20mm, increase the distance between the powder feeding nozzle and the base material surface, reduce heat radiation, and avoid the situation that the powder feeding nozzle is blocked.

[0013] 3. The protective sleeve can also protect the powder feeding pipe, prevent the laser spatter and heat radiation from directly contacting the powder feeding nozzle, and improve the service life of the powder feeding nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structural schematic diagram of the present application;

[0015] Fig. 2 It is a full cross-sectional structural schematic diagram of the present application;

[0016] Fig. 3 It is an exploded full cross-sectional structural schematic diagram of the present application.

[0017] In the figure: 1-fixed ring, 2-first gas path, 3-second gas path, 4-sink groove, 5-branch ring, 6-feeding head, 7-feeding channel, 8-groove, 9-protection gas path, 10-powder feeding pipe, 11-protection sleeve, 12-air outlet hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0019] Combined Figs. 1 to 3The gas-borne double-gas-path annular powder feeding nozzle for laser cladding shown comprises a fixed ring 1, a first gas path 2 is formed in the middle of the upper end of the fixed ring 1, a second gas path 3 is formed on one side of the first gas path 2, a sink groove 4 is formed in the lower end of the fixed ring 1, a shunt ring 5 is arranged inside the sink groove 4, the shunt ring 5 is connected with the sink groove 4 through threads, a feeding head 6 is arranged on the upper end of the shunt ring 5, the feeding head 6 is matched with the first gas path 2, a feeding channel 7 is formed in the first gas path 2 at the corresponding position of the shunt ring 5, a recess 8 is formed on the upper surface of the shunt ring 5, a plurality of protection gas paths 9 are formed inside the recess 8 and around the feeding head 6, the second gas path 3 is located directly above the recess 8, a powder feeding pipe 10 is arranged at the lower end of the feeding channel 7, the powder feeding pipe 10 is connected with the feeding channel 7 through threads, a protective sleeve 11 is arranged around the powder feeding pipe 10, the protective sleeve 11 is connected with the lower end of the shunt ring 5 through threads, and the protective sleeve 11 is formed with an air outlet hole 12 at the corresponding position of the powder feeding pipe 10.

[0020] Wherein, the upper ends of the first gas path 2 and the second gas path 3 are connected with copper pipes, which can improve heat resistance and prevent damage to the gas pipe, the upper end of the feeding head 6 is inverted at a right angle, and the first gas path 2 is inverted at a right angle at the corresponding position of the feeding head 6, which can seal the feeding head 6 and the first gas path 2 to prevent the two gas paths from being connected, the middle outer diameter surface of the powder feeding pipe 10 is hexagonal, which facilitates the installation and removal of the powder feeding pipe 10, and the inner diameter size of the air outlet hole 12 is larger than the outer diameter size of the lower end of the powder feeding pipe 10, which ensures that an annular gas can be formed around the powder feeding pipe.

[0021] Working principle: The gas drives the cladding material to come down from the first gas path, enter the powder feeding pipe through the feeding channel, and the powder feeding pipe will be aligned with the base material, so that the cladding material can be sprayed to the outer surface of the base material, the second gas path is ventilated, passes through the protection gas path on the recess, and uniformly enters between the protective sleeve and the powder feeding pipe, and then is discharged from the air outlet hole, so that an annular air cluster can be formed around the cladding material cluster sprayed from the powder feeding pipe, which can play a guiding and accelerating role on the cladding material, and the effective length of the cladding material cluster can be increased to 20 mm, thereby increasing the distance between the powder feeding nozzle and the surface of the base material, reducing heat radiation, and avoiding the situation that the powder feeding nozzle is blocked, and the protective sleeve can also protect the powder feeding pipe, prevent the laser from splashing and directly contacting the powder feeding nozzle, and improve the service life of the powder feeding nozzle.

[0022] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No feature of the application is to be construed as a limitation thereon unless it is expressly stated to be such.

[0023] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An air-borne double-gas-path ring-shaped powder feeding nozzle for laser cladding, characterized in that: The utility model relates to a fixed ring (1) is provided with first gas path (2) in the middle of upper end, one side of first gas path (2) is provided with second gas path (3), and the lower end of fixed ring (1) is provided with sunken groove (4), and the inside of sunken groove (4) is equipped with branch ring (5), and branch ring (5) is connected through thread with sunken groove (4), and the upper end of branch ring (5) is equipped with feed head (6), and feed head (6) is in accord with first gas path (2), and branch ring (5) is provided with feed channel (7) in the corresponding position of first gas path (2), and the upper surface of branch ring (5) is provided with recess (8), and the inside of recess (8) and the periphery of feed head (6) are provided with a plurality of protective gas path (9), and second gas path (3) is located the upper of recess (8), and the lower end of feed channel (7) is equipped with powder feeding pipe (10), and powder feeding pipe (10) is connected through thread with feed channel (7), and the periphery of powder feeding pipe (10) is equipped with protective sleeve (11), and protective sleeve (11) is connected through thread with the lower end of branch ring (5), and protective sleeve (11) is provided with air outlet (12) in the corresponding position of powder feeding pipe (10). The upper end of first gas path (2) and second gas path (3) is connected with copper pipe, and the upper end of feed head (6) is inverted right angle, and first gas path (2) is inverted right angle in the corresponding position of feed head (6).

2. The gas-carried double-gas-path ring-shaped powder feeding nozzle for laser cladding according to claim 1, characterized in that: The middle outer diameter surface of powder feeding pipe (10) is hexagonal.

3. The gas-carried double-gas-path ring-shaped powder feeding nozzle for laser cladding according to claim 1, characterized in that: The inner diameter size of air outlet (12) is greater than the lower end outer diameter size of powder feeding pipe (10).

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