Powder discharging device for plasma powder welding

Abstract

The utility model belongs to the technical field of welding equipment, and discloses a plasma powder welding powder discharging device which comprises a powder feeding box, a powder storage tank and a powder feeding channel, a containing cavity is formed in the powder feeding box, a rotatable powder feeding wheel is arranged in the containing cavity, and a plurality of powder containing grooves are formed in the circumferential surface of the powder feeding wheel. The outlet end of the powder storage tank communicates with the containing cavity and is used for conveying powder into the containing cavity. The powder feeding channel penetrates through the powder feeding box and communicates with the containing cavity, the arrangement position of the powder feeding channel is tangent to the section circle of the powder feeding wheel, a first connector is arranged at one end of the powder feeding channel, high-pressure gas is introduced into the first connector, and a second connector connected with a plasma welding gun is arranged at the other end of the powder feeding channel. According to the powder discharging device for plasma powder welding, the powder feeding wheel is adopted to stir and scatter powder, and then the powder is brought out in cooperation with air flow of the powder feeding channel, so that the powder discharging uniformity is guaranteed, the cladding thickness can be controlled easily, and then the welding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a plasma powder welding powder feeding device. Background Art

[0002] Plasma powder welding uses plasma arc as heat source. The high temperature generated by plasma arc is used to rapidly heat alloy powder and substrate surface and melt, mix, diffuse and solidify them together. After the plasma beam leaves, it is self-excited to cool and form a high-performance alloy layer, thereby achieving a surfacing process that strengthens and hardens the surface of the part. Among them, alloy powder is an important welding medium. The plasma beam is used as a heat source to rapidly melt the alloy powder on the substrate surface into an alloy molten pool. Therefore, the laying effect of alloy powder on the substrate surface directly affects the final molding quality.

[0003] Alloy powder is generally continuously supplied by a powder feeder according to the required amount, and is fed into the welding gun with the help of the powder feeding airflow and blown into the arc. In actual use, it is found that alloy powder is greatly affected by the air pressure of the powder feeding airflow, the powder output is unstable, it is difficult to fully ensure uniform laying on the substrate surface, and the cladding thickness is difficult to control, which affects the welding effect, and needs to be improved. Utility Model Content

[0004] Based on the above problems, the purpose of the utility model is to provide a plasma powder welding powder feeding device, which helps to evenly lay the alloy powder on the surface of the substrate and improve the welding quality.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A plasma powder welding powder feeding device, comprising:

[0007] A powder delivery box, wherein a cavity is provided in the powder delivery box, a rotatable powder delivery wheel is provided in the cavity, and a plurality of powder-carrying grooves are provided on the circumferential surface of the powder delivery wheel;

[0008] A powder storage tank, the outlet end of which is in communication with the cavity, and is used for conveying powder into the cavity;

[0009] A powder feeding channel, the powder feeding channel runs through the powder feeding box and is connected to the containing cavity, and the arrangement position of the powder feeding channel is tangent to the cross-sectional circle of the powder feeding wheel. A first joint is provided at one end of the powder feeding channel, and high-pressure gas is passed into the first joint. A second joint connected to the plasma welding gun is provided at the other end of the powder feeding channel.

[0010] As an optional solution, it also includes a driving motor, which is fixed to the outer surface of the powder feeding box, and the output shaft of the driving motor extends into the cavity and is fixedly connected to the powder feeding wheel.

[0011] As an optional solution, the rotation speed of the powder feeding wheel is adjustable, and the rotation speed of the powder feeding wheel is proportional to the amount of powder delivered by the powder feeding wheel to the powder feeding channel.

[0012] As an optional solution, the powder storage tank is located above the powder delivery box, the outlet end of the powder storage tank is located at the bottom of the powder storage tank, and the powder in the powder storage tank falls into the cavity by gravity.

[0013] As an optional solution, a third joint is provided on the powder storage tank, and a pressurization pipeline is provided in the powder storage tank, extending from the third joint to the top of the tank. High-pressure gas is introduced into the third joint to help the powder in the powder storage tank enter the cavity.

[0014] As an option, the high pressure gas is argon.

[0015] As an optional solution, the powder feeding channel is located on the discharge side of the powder feeding wheel according to the rotation direction of the powder feeding wheel, a powder stacking area is provided in the cavity and on the feed side of the powder feeding wheel, and the outlet end of the powder storage tank is connected to the top of the powder stacking area.

[0016] As an optional solution, the bottom of the powder stacking area is the lowest position of the cavity, and the powder feeding box is provided with a powder discharge valve connected to the bottom of the powder stacking area, and the powder discharge valve is used to empty the powder in the cavity.

[0017] As an optional solution, one side of the cavity facing the end face of the powder feeding wheel is open, and a transparent plate is provided on the open side, and a cover plate for pressing the transparent plate is provided on the powder feeding box, and an observation window is provided on the cover plate.

[0018] As an optional solution, a rubber ring that is in sealing contact with the transparent plate is provided at the cavity opening of the cavity and / or the edge of the observation window.

[0019] The beneficial effects of the utility model are as follows: the plasma powder welding powder feeding device adopts a powder feeding wheel to stir and scatter the powder, and then cooperates with the airflow of the powder feeding channel to bring the powder out, thereby ensuring the uniformity of powder output, and also helping to control the thickness of the cladding, thereby ensuring the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a plasma powder welding powder feeding device provided by an embodiment of the utility model;

[0021] Figure 2 This is an exploded view of a plasma powder welding powder feeding device provided by an embodiment of the utility model;

[0022] Figure 3 It is a side view of a plasma powder welding powder feeding device provided by an embodiment of the utility model;

[0023] Figure 4 yes Figure 3Cross-section view at AA in the middle.

[0024] In the attached figure:

[0025] 1. powder delivery box; 11. chamber; 111. powder stacking area; 12. powder discharge valve;

[0026] 2. Powder storage tank; 21. Third joint; 22. Pressurization pipeline;

[0027] 3. Powder delivery channel; 31. First joint; 32. Second joint;

[0028] 4. Powder feeding wheel; 41. Powder groove;

[0029] 5. Drive motor;

[0030] 6. Transparent board;

[0031] 7. Cover plate; 71. Observation window;

[0032] 8. Rubber ring. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] See also Figures 1 to 4 As shown, this preferred embodiment provides a plasma powder welding powder feeding device, including a powder feeding box 1, a powder storage tank 2 and a powder feeding channel 3, wherein:

[0038] The powder delivery box 1 is provided with a cavity 11, and a rotatable powder delivery wheel 4 is provided in the cavity 11, and a plurality of powder-carrying grooves 41 are provided on the circumferential surface of the powder delivery wheel 4;

[0039] The outlet end of the powder storage tank 2 is communicated with the cavity 11, and is used to transport powder into the cavity 11;

[0040] The powder feeding channel 3 passes through the powder feeding box 1 and is connected to the cavity 11, and the arrangement position of the powder feeding channel 3 is tangent to the cross-sectional circle of the powder feeding wheel 4. A first joint 31 is provided at one end of the powder feeding channel 3, and high-pressure gas is passed into the first joint 31. The other end of the powder feeding channel 3 is provided with a second joint 32 connected to the plasma welding gun.

[0041] It should be noted that there is only a small gap between the discharge side of the powder feeding wheel 4 and the wall of the cavity 11, so that the powder-carrying groove 41 can transfer a substantially constant amount of powder from the feed side of the powder feeding wheel 4 to the discharge side, and the powder discharge amount per unit time can be regulated by controlling the rotation speed of the powder feeding wheel 4. The powder-carrying groove 41 here is preferably a tapered hole evenly distributed on the circumferential surface of the powder feeding wheel 4.

[0042] Therefore, the powder is stirred and dispersed by the powder feeding wheel 4, and then the powder is brought out by the airflow of the powder feeding channel 3, thereby ensuring the uniformity of powder output, and also helping to control the thickness of the cladding, thereby ensuring the welding quality.

[0043] Specifically, the plasma powder welding powder feeding device also includes a driving motor 5, which is fixed to the outer surface of the powder feeding box 1. The output shaft of the driving motor 5 extends into the cavity 11 and is fixedly connected to the powder feeding wheel 4. The driving motor 5 intelligently controls the rotation of the powder feeding wheel 4.

[0044] Furthermore, the rotation speed of the powder feeding wheel 4 is adjustable, and the rotation speed of the powder feeding wheel 4 is proportional to the amount of powder delivered by the powder feeding wheel 4 to the powder feeding channel 3, that is, the faster the powder feeding wheel 4 rotates, the greater the powder output; conversely, the smaller the powder output.

[0045] In particular, the powder storage tank 2 is located above the powder feeding box 1, and the outlet end of the powder storage tank 2 is located at the bottom of the powder storage tank 2. The powder in the powder storage tank 2 falls into the cavity 11 by gravity. As the powder in the cavity 11 decreases, the powder in the powder storage tank 2 will be automatically replenished into the cavity 11 to ensure uniform and stable powder output.

[0046] Specifically, the powder storage tank 2 is provided with a third joint 21, and a pressurizing pipeline 22 extending from the third joint 21 to the top of the powder storage tank 2 is provided in the powder storage tank 2. High-pressure gas is also introduced into the third joint 21 to help the powder in the powder storage tank 2 enter the cavity 11. Therefore, proper pressurization can help the powder to be smoothly delivered into the cavity 11 to avoid powder jamming and the like.

[0047] Preferably, the high-pressure gas here is argon, which is a safe protective gas and can neither burn nor support combustion, nor react with powder.

[0048] Specifically, the powder feeding channel 3 is located at the discharge side of the powder feeding wheel 4 according to the rotation direction of the powder feeding wheel 4, a powder accumulation area 111 is provided in the cavity 11 and at the feed side of the powder feeding wheel 4, and the outlet end of the powder storage tank 2 is connected to the top of the powder accumulation area 111. The powder accumulation area 111 needs to ensure a sufficient amount of powder so that the powder-carrying grooves 41 on the feed side can all be filled with powder.

[0049] Furthermore, the bottom of the powder accumulation area 111 is the lowest position of the cavity 11, and the powder delivery box 1 is provided with a powder discharge valve 12 connected to the bottom of the powder accumulation area 111, and the powder discharge valve 12 is used to empty the powder in the cavity 11. Since the powder may need to be replaced according to the material of the substrate, the original powder needs to be emptied, which can be easily achieved through the powder discharge valve 12, but at this time the second joint 32 should be closed.

[0050] In particular, one side of the end face of the cavity 11 facing the powder feeding wheel 4 is open, and a transparent plate 6 is provided on the open surface. The powder feeding box 1 is provided with a cover plate 7 for pressing the transparent plate 6, and an observation window 71 is provided on the cover plate 7 to observe the conveying situation of the powder in the cavity 11 in real time.

[0051] Furthermore, a rubber ring 8 is provided at the mouth of the cavity 11 and / or the edge of the observation window 71 to seal with the transparent plate 6 to ensure the sealing of the cavity 11. This embodiment takes the rubber ring 8 provided between the mouth of the cavity 11 and the transparent plate 6 as an example.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Plasma powder welding powder feeding device, characterized in that: include: A powder delivery box (1), wherein a chamber (11) is provided in the powder delivery box (1), a rotatable powder delivery wheel (4) is provided in the chamber (11), and a plurality of powder-carrying grooves (41) are provided on the circumferential surface of the powder delivery wheel (4); A powder storage tank (2), the outlet end of which is in communication with the containing cavity (11) and is used for conveying powder into the containing cavity (11); A powder feeding channel (3), wherein the powder feeding channel (3) passes through the powder feeding box (1) and is connected to the containing cavity (11), and the arrangement position of the powder feeding channel (3) is tangent to the cross-sectional circle of the powder feeding wheel (4), a first joint (31) is provided at one end of the powder feeding channel (3), and high-pressure gas is passed through the first joint (31), and a second joint (32) connected to a plasma welding gun is provided at the other end of the powder feeding channel (3).

2. The plasma powder welding powder feeding device according to claim 1, characterized in that: It also includes a driving motor (5), which is fixed to the outer surface of the powder feeding box (1), and the output shaft of the driving motor (5) extends into the containing cavity (11) and is fixedly connected to the powder feeding wheel (4).

3. The plasma powder welding powder feeding device according to claim 2, characterized in that: The rotation speed of the powder feeding wheel (4) is adjustable, and the rotation speed of the powder feeding wheel (4) is proportional to the amount of powder delivered by the powder feeding wheel (4) to the powder feeding channel (3).

4. The plasma powder welding powder feeding device according to claim 1, characterized in that: The powder storage tank (2) is located above the powder delivery box (1), the outlet end of the powder storage tank (2) is located at the bottom of the powder storage tank (2), and the powder in the powder storage tank (2) falls into the containing cavity (11) by gravity.

5. The plasma powder welding powder feeding device according to claim 4, characterized in that: The powder storage tank (2) is provided with a third joint (21), and a pressurizing pipeline (22) is provided in the powder storage tank (2) and extends from the third joint (21) to the top of the tank of the powder storage tank (2). High-pressure gas is also introduced into the third joint (21) to help the powder in the powder storage tank (2) enter the containing cavity (11).

6. The plasma powder welding powder feeding device according to claim 1 or 5, characterized in that: The high pressure gas is argon.

7. The plasma powder welding powder feeding device according to claim 1, characterized in that: The powder feeding channel (3) is located on the discharge side of the powder feeding wheel (4) according to the rotation direction of the powder feeding wheel (4), a powder accumulation area (111) is provided in the containing cavity (11) and on the feed side of the powder feeding wheel (4), and the outlet end of the powder storage tank (2) is connected to the top of the powder accumulation area (111).

8. The plasma powder welding powder feeding device according to claim 7, characterized in that: The bottom of the powder accumulation area (111) is the lowest position of the containing cavity (11), and the powder delivery box (1) is provided with a powder discharge valve (12) which is in communication with the bottom of the powder accumulation area (111), and the powder discharge valve (12) is used to discharge the powder in the containing cavity (11).

9. The plasma powder welding powder feeding device according to claim 1, characterized in that: A side surface of the cavity (11) facing the end surface of the powder feeding wheel (4) is open, and a transparent plate (6) is provided on the open side surface; a cover plate (7) for pressing the transparent plate (6) is provided on the powder feeding box (1), and an observation window (71) is provided on the cover plate (7).

10. The plasma powder welding powder feeding device according to claim 9, characterized in that: The cavity opening of the cavity (11) and / or the edge of the observation window (71) are provided with a rubber ring (8) which is in sealing contact with the transparent plate (6).

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