CN214782082U

CN214782082U - Preparation facilities of two superimposed coatings

Info

Publication number: CN214782082U
Application number: CN202120405168.6U
Authority: CN
Inventors: 王新生; 刘炎培; 刘琨; 候俊剑
Original assignee: Zhengzhou University of Light Industry
Current assignee: Zhengzhou University of Light Industry
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-11-19
Anticipated expiration: 2031-02-24

Abstract

The utility model relates to a preparation facilities of two superimposed coatings, including welder, welder has the cavity, be provided with negative pole and positive pole on the cavity wall, welder still has the air inlet that supplies the working gas to get into and the powder import that supplies the spraying powder to get into with the cavity intercommunication, welder still has the jet, be provided with the shunt in jet department in welder, two melt channels are cut apart into with the jet to the shunt, the melt after the spraying powder melts is shunted into two tunnel sprays to the substrate on the surface, the discharge gate area of two melt channels is different, so that two tunnel melts superpose the interlock each other between the coating that substrate surface formed. The occurrence of pores and cracks of the whole coating caused by non-occlusion between the coatings is reduced, and the strength of the coating is greatly increased.

Description

Preparation facilities of two superimposed coatings

Technical Field

The utility model relates to a surface coating technical field, concretely relates to preparation facilities of two superimposed coatings.

Background

The working process of plasma thermal spraying is to adopt the heat released by plasma flame generated by non-transferred plasma arc as a heating source, heat the spraying powder entering the heating source to a softened or molten particle state, spray the mixed powder on the surface of a base material by utilizing the pressure of working gas, and finally impact the surface of the pretreated base material at a high speed to spread and deposit to form a surface protective coating with a certain thickness. The device commonly used for thermal spraying is a welding gun, as shown in fig. 1, the welding gun 1 is provided with a chamber 2, a cathode 3 and an anode 4 are arranged on the wall of the chamber, the welding gun is also provided with an air inlet 5 communicated with the chamber and used for entering working gas and a powder inlet 6 used for entering spraying powder, and the welding gun is also provided with a jet orifice 7. However, the whole coating on the surface of the base material is formed by a plurality of coatings, and because the welding gun only has one jet orifice, one coating is formed at one time, the problem that the plurality of coatings are not mutually occluded can be caused to the whole coating on the surface 8 of the base material, and the problems of pores, cracks and low strength can be caused to the microcosmic appearance of a sprayed coating formed under the device. At present, the research on the coating is to adjust the mechanical property of the coating by changing the process parameters such as the components, the particle size and the like of the mixed powder, but the strength of the finally obtained coating is still not greatly improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a preparation facilities of two stack coatings to solve the problem that the interlock between the multichannel coating that exists leads to substrate surface monolithic coating to appear hole, crackle, intensity low among the prior art.

In order to achieve the above object, the utility model discloses a preparation facilities of two superimposed coatings adopts following technical scheme: the utility model provides a preparation facilities of two superimposed coatings, includes welder, and welder has the cavity, is provided with negative pole and positive pole on the chamber wall, and welder still has the air inlet that supplies working gas to get into and the powder import that supplies spraying powder to get into with the cavity intercommunication, and welder still has the jet orifice, be provided with the shunt in jet orifice department in welder, the shunt divides into two melt channels with the jet orifice, and the melt after the melting of spraying powder divides into two ways and sprays to the substrate on the surface, and the discharge gate area of two melt channels is different to make two ways of melts overlap the interlock each other between the coating that substrate surface formed.

The two melt channels are arranged at intervals from top to bottom, and the area of the discharge port of the melt channel above the melt channel is larger than that of the discharge port of the melt channel below the melt channel.

The ratio of the area of the discharge hole of the upper melt channel to the area of the discharge hole of the lower melt channel is 4: 1.

The shunt is a cone structure with the tip end positioned in the welding gun and the large end facing outwards, and the cone structure is connected with the inner walls of the left side and the right side of the jet orifice.

The shunt is an angle plate with the tip end positioned in the welding gun, and the left end and the right end of the angle plate are connected with the inner walls of the left side and the right side of the jet orifice.

The utility model has the advantages that: in the cavity that the spraying powder got into welder, melt the back under working gas's pressure, spout through two melt channels and go out, the discharge gate area of two melt channels is different, and at welder's removal in-process, the melt that spouts in two melt channels forms two coatings that interlock each other and stack together on the substrate surface, has reduced not interlock between the coating and has leaded to the appearance of whole coating appearance hole and crackle, greatly increased the intensity of coating.

Drawings

FIG. 1 is a schematic view of a welding gun of the prior art;

FIG. 2 is a schematic structural view of a first embodiment of an apparatus for preparing a double-layered coating according to the present invention;

FIG. 3 is a cross-sectional view between the diverter and the injection port of the torch of FIG. 2;

FIG. 4 is a sectional view of a flow divider and a nozzle of a welding gun according to a second embodiment of the apparatus for preparing a double-layered coating according to the present invention;

FIG. 5 is a sectional view of a flow divider and a nozzle of a welding gun according to a third embodiment of the apparatus for preparing a double-layered coating according to the present invention;

FIG. 6 is a sectional view of a flow divider and a nozzle of a welding gun according to a second embodiment of the apparatus for preparing a double-layered coating according to the present invention;

fig. 7 is a schematic structural diagram of a gun head in a fifth embodiment of the apparatus for preparing a double-laminated coating according to the present invention.

Detailed Description

The first embodiment of the apparatus for preparing a double-layered coating of the present invention, as shown in fig. 2-3, includes a welding gun 1 having a chamber 2, and a cathode 3 and an anode 4 disposed on the chamber wall. The welding gun is also provided with an air inlet 5 communicated with the chamber and used for the working gas to enter and a powder inlet 6 used for the spraying powder to enter, and the welding gun is also provided with a jet orifice. A splitter 9 is arranged at the injection port in the welding gun, the splitter divides the injection port into two melt channels (10, 11), and the molten melt is split into two paths to be sprayed on the surface of the base material. The areas of the discharge holes of the two melt channels are different, so that the two melt channels are overlapped and occluded with each other between coatings formed on the surface of the base material. The reason why the discharge gate area of two melt passageways sets to the variation in size lies in: the welding gun can form a large-area coating and a small-area coating in sequence, the small-area coating and the large-area coating can be partially overlapped and occluded with each other, and the large coating and the small coating can be overlapped when the welding gun sprays other parts of the surface of the base material next time, so that the small coating is completely filled between the two large coatings, and the problem that the strength of the position is low due to the fact that the connecting edge of the coating and the surface of the base material is exposed in the prior art is solved. The two melt channels are arranged at intervals up and down, and the area of the discharge port of the melt channel 10 above is larger than that of the discharge port of the melt channel 11 below. The ratio of the area of the outlet of the upper melt channel 10 to the area of the outlet of the lower melt channel 11 is 4: 1. In this embodiment, the cross section of the jet orifice is rectangular, the shunt 9 is a triangular plate with a tip end located in the welding gun, and the left and right ends of the triangular plate are connected with the left and right inner walls of the jet orifice.

When the spraying gun is used, the spraying powder enters a cavity of the welding gun, is melted into a molten material under the action of plasma arcs between the cathode and the anode, the molten material is divided into two paths to be sprayed onto the surface of a substrate through two molten material channels under the pressure of working gas, and the area of a discharge port of an upper molten material channel is four times that of a discharge port of a lower molten material channel. In the moving process of the welding gun, the molten materials jetted out of the two molten material channels form two coatings which are mutually occluded and overlapped on the surface of the base material, so that the problems of pores, cracks and the like of the whole coating caused by non-occlusion between the coatings are avoided, and the strength of the coating is greatly increased.

The second embodiment of the apparatus for preparing a dual-stacked coating of the present invention, as shown in fig. 4, is different from the first embodiment only in that the shape of the injection port is different, and the cross section of the injection port is circular in this embodiment.

The utility model discloses a preparation facilities's of two superimposed coatings embodiment three, as shown in fig. 5, only lie in with the difference of embodiment one, the shape of jet and the shape of shunt are different, and the cross section of jet is the ellipse that the major axis extends along upper and lower direction in this embodiment, and shunt 9 is most advanced to be located welder in, the main aspects cone structure outwards, the left and right sides wall connection of cone structure and jet.

The utility model discloses a preparation facilities's of two superimposed coatings embodiment four, as shown in figure 6, the difference with embodiment one only lies in, and the structure of jet and the structure of shunt are different, and in this embodiment, the cross section of jet is circular, and shunt 9 is the scute that the most advanced lies in welder, and the scute includes the hang plate that two slopes set up, both ends and the left and right sides wall connection of jet about the scute.

The utility model discloses a preparation facilities's of two superimposed coatings embodiment five, as shown in fig. 7, the tip that only lies in welder with the difference of embodiment one is provided with the rifle head, and the structure of rifle head is shown in fig. 7, and the rifle head includes casing 12, and the casing has two discharging channel 13 that correspond with each melt passageway. Each discharging channel comprises a feeding hole 14 and a spraying hole 15, and each feeding hole corresponds to the discharging hole of each melting channel in size and shape. Each discharging channel is provided with an advection section 18, a transition section 19 and a diffusion section 20, the cross section of a jet orifice of the diffusion section is circular, and the circular jet orifice can improve the shape and the forming effect of powder forming. The end part of the shell facing the welding gun is provided with a connecting plate 16 to form an installation cavity 17, when the welding gun is used, the end part of the welding gun is inserted into the installation cavity, the outer side wall of the flow divider is in sealing contact with the shell part between the two discharging channels, and the end face of the shell is in sealing contact with the end face of the welding gun.

Claims

1. The utility model provides a preparation facilities of two superimposed coatings, includes welder, and welder has the cavity, is provided with negative pole and positive pole on the cavity wall, and welder still has the air inlet that supplies the working gas entering and supplies the powder import that spraying powder got into with the cavity intercommunication, and welder still has the jet orifice, its characterized in that: a splitter is arranged at the position of an injection port in the welding gun and divides the injection port into two melt channels, the melt after the spraying powder is melted is split into two paths to be sprayed onto the surface of the substrate, and the areas of the discharge ports of the two melt channels are different, so that the two paths of melt are overlapped and occluded with each other between coatings formed on the surface of the substrate.

2. The apparatus for preparing a dual overlay coating according to claim 1, wherein: the two melt channels are arranged at intervals from top to bottom, and the area of the discharge port of the melt channel above the melt channel is larger than that of the discharge port of the melt channel below the melt channel.

3. The apparatus for preparing a dual overlay coating according to claim 2, wherein: the ratio of the area of the discharge hole of the upper melt channel to the area of the discharge hole of the lower melt channel is 4: 1.

4. The apparatus for preparing a double superposed coating according to claim 2 or 3, characterized in that: the shunt is a cone structure with the tip end positioned in the welding gun and the large end facing outwards, and the cone structure is connected with the inner walls of the left side and the right side of the jet orifice.

5. The apparatus for preparing a double superposed coating according to claim 2 or 3, characterized in that: the shunt is an angle plate with the tip end positioned in the welding gun, and the left end and the right end of the angle plate are connected with the inner walls of the left side and the right side of the jet orifice.