Online powder adding device and method for carrier gas type powder feeder

Abstract

The invention discloses an online powder adding device and method for a carrier gas type powder feeder. The online powder adding device comprises an upper powder barrel part, a lower powder barrel part, a switching valve part, a communicating pipeline part and a stirring part. The upper powder barrel part and the lower powder barrel part are communicated through the switching valve part to form a powder conveying channel; the communicating pipeline component is connected with the side upper part of the upper powder barrel component and the side upper part of the lower powder barrel component to form a pressure balance channel; the stirring part penetrates through the upper powder barrel part, the switching valve part and the lower powder barrel part from top to bottom and continuously stirs powder in the two powder barrels. The powder feeding device aims to solve the problems of shutdown powder feeding in the construction process and stability of an online powder feeding conveying system, and has the advantages of simple structure, convenience in operation, large section of a powder feeding channel, small powder residual quantity, stable powder carrying gas state and capability of accurately, stably and continuously feeding powder for a long time.

Description

Technical Field

[0001] The present invention relates to the field of air-carrying powder conveying, and more particularly to an online powder adding device and method for an air-carrying powder feeder. Background Art

[0002] With the development and widespread application of technologies such as spray coating and laser cladding, the application of gas-carrying powder delivery technology has also been greatly improved. In the spray coating and cladding processes, the material powder needs to be transported to the work area. Therefore, the precise, stable and continuous powder delivery directly affects the quality and continuity of the coating and cladding layer.

[0003] With the increasing application of this technology on large workpieces, the problem of adding powder to air-carrying powder feeders without stopping the machine and without affecting the stability of the entire powder delivery system is urgently needed. However, existing air-carrying powder feeders with online powder feeding functions cannot ensure completely consistent carrier gas conditions during the powder feeding process. During the powder feeding operation, the powder state in the working area fluctuates, causing defects in the coating and cladding layer in that area, affecting the quality of the spraying and cladding of the entire large workpiece.

[0004] At the same time, some carrier gas powder feeders use an online powder adding method with multiple powder barrels. In addition to the above-mentioned defects, there are also problems such as large size and inconvenient operation, multiple powder barrels do not have a stirring function, small powder adding channels, easy to clog, and a large amount of powder residual in the powder barrel after adding powder. Summary of the Invention

[0005] The purpose of the present invention is to provide an online powder adding device and method for a carrier gas powder feeder, so as to achieve continuous powder feeding with stable carrier gas pressure, uninterrupted stirring and low residual amount, and solve the efficiency and quality problems caused by frequent shutdown for powder adding in the processing of large workpieces.

[0006] The technical solution adopted by the present invention to solve this technical problem is: an online powder adding device for a carrier gas powder feeder, comprising: Upper powder barrel component, lower powder barrel component, switching valve component, connecting pipe component and stirring component; The upper powder barrel component and the lower powder barrel component are connected through the switching valve component to form a powder conveying channel; The communication pipe component connects the upper side portion of the upper powder barrel component and the upper side portion of the lower powder barrel component to form a pressure balance channel; The stirring component penetrates the upper powder barrel component, the switching valve component and the lower powder barrel component from top to bottom, and continuously stirs the powder in the two powder barrels.

[0007] As a further solution of the present invention, the switching valve component includes an upper valve plate, a middle valve plate and a lower valve plate, which are sealed together; The upper valve plate is provided with a plurality of first powder passage holes, the middle valve plate is provided with a plurality of second powder passage holes, and the lower valve plate is provided with a plurality of third powder passage holes; The middle valve plate can slide transversely to align or displace the second powder channel hole with the first and third powder channel holes, thereby achieving connection or disconnection of the powder channels.

[0008] As a further solution of the present invention, a first sealing ring is provided around the first powder channel hole to ensure sealing and isolation between the powder conveying channel and the space inside the valve; A second sealing ring is provided around the edge of the upper valve plate to ensure sealing isolation between the valve interior and exterior spaces; A fourth sealing ring is provided around the third powder channel hole to ensure sealing and isolation between the powder delivery channel and the space inside the valve; A fifth sealing ring is provided around the edge of the lower valve plate to ensure sealing isolation between the valve interior space and the exterior space.

[0009] As a further solution of the present invention, a first through-channel hole is provided at the center of the upper valve plate, and a third sealing ring is installed in the first through-channel hole to ensure the passage and sealing of the lower stirring rod of the stirring member; A second through-channel hole is provided in the center of the middle valve plate, which is an oblong hole, to ensure that the stirring member passing through from top to bottom passes through the middle valve plate and adapts to the lateral sliding of the middle valve plate; A third through-channel hole is provided at the center of the lower valve plate, and a sixth sealing ring is installed in the third through-channel hole to ensure that the lower stirring rod of the stirring component passes through and is sealed.

[0010] As a further solution of the present invention, the communication pipe component includes an upper communication pipe, a communication valve and a lower communication pipe; The upper communicating pipe is provided with an air release valve and an upper pressure display gauge, and the lower communicating pipe is provided with a lower pressure display gauge; By adjusting the air release valve and the communication valve, the internal pressures of the upper powder barrel component and the lower powder barrel component are dynamically balanced.

[0011] As a further embodiment of the present invention, the stirring member includes an upper stirring rod and a lower stirring rod coaxially connected, the upper stirring rod is located in the upper powder barrel member and is provided with a stirring rod protective cover, and the lower stirring rod extends into the lower powder barrel member; The stirring component keeps rotating continuously when the switching valve component is in the connected state or the disconnected state.

[0012] As a further solution of the present invention, the first powder channel holes, the second powder channel holes and the third powder channel holes of the switching valve component are distributed in parallel in groups to form a powder adding channel with a large cross section.

[0013] As a further solution of the present invention, a powder adding port and an air charging valve are provided on the top of the upper powder barrel component, and the air charging valve is connected to an external powder-carrying air source.

[0014] The present invention also provides an online powder adding method based on the device, comprising the following steps: During normal powder feeding, the switching valve component is in the connected state, the stirring component continues to operate, and the lower powder bucket component delivers powder to the powder feed tray component; S2. To prepare for powder addition, close the connecting valve and adjust the pressure in the upper powder bucket to the same level as the lower powder bucket through the air relief valve. S3. Slide the valve plate to cut off the powder channel, open the powder adding port and add powder to the upper powder barrel component; S4. After powder addition is completed, the sliding valve plate connects the powder channel, and the powder quickly flows into the lower powder barrel component through multiple channels, and the stirring component simultaneously eliminates the residue.

[0015] The present invention has at least the following beneficial effects: The present invention monitors the powder-carrying gas pressure inside the upper powder bucket component and the lower powder bucket component in real time through the upper pressure display gauge and the lower pressure display gauge, and controls powder addition according to the display values ​​of the upper pressure display gauge and the lower pressure display gauge, so that the working environment of the conveying part of the entire powder feeding system can have high consistency and high stability, so that the working part can obtain long-term, accurate, stable and continuous powder supply, ensuring high quality, high stability and continuity of the operation.

[0016] When the switching valve of the present invention is in the connecting position, the structure of the multi-way powder channel can enable the powder added to the upper powder bucket component to quickly enter the lower powder bucket component. At the same time, the compact structure can greatly reduce the impact of the flowing powder on the original powder inside the lower powder bucket component, greatly reducing the impact on the state of the powder feeding system during operation.

[0017] The present invention provides a stirring function normally in both the online powder adding and powder feeding operation state and the non-powder adding and powder feeding operation state, and the stirring component that runs through the upper powder bucket component and the lower powder bucket component from top to bottom can avoid the blockage of the powder added in the upper powder bucket component when passing through the switching valve; the powder in the upper powder bucket component is fully flowed into the lower powder bucket component, and the amount of powder residual in the upper powder bucket component is greatly reduced; at the same time, a consistent stirring effect is provided for the powder in the lower powder bucket component, and the powder feeding state is not inconsistent due to the change of state of the powder in the lower powder bucket component caused by the cessation of stirring during the powder adding operation.

[0018] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : Schematic diagram of the overall structure of the online powder adding device; Figure 2 : Schematic diagram of the overall cross-sectional structure of the online powder adding device; Figure 3 : Cross-sectional view of switching valve components; Figure 4 : Top view of the upper valve plate structure; Figure 5 : Top view of the middle valve plate structure; Figure 6 : Top view of the lower valve plate structure.

[0020] Among them, 1-upper powder barrel component, 2-switching valve component, 3-lower powder barrel component, 4-powder feeding plate component, 5-connecting pipe component, 6-stirring component, 7-powder adding port, 8-inflating valve, 9-upper valve plate, 10-middle valve plate, 11-lower valve plate, 12-upper connecting pipe, 13-connecting valve, 14-lower connecting pipe, 15-air relief valve, 16-upper pressure display gauge, 17-lower pressure display gauge, 18-first powder channel hole, 19-second powder channel hole, 20-third powder channel hole, 21-first through channel hole, 22-second through channel hole, 23-third through channel hole, 24-first sealing ring, 25-second sealing ring, 26-third sealing ring, 27-fourth sealing ring, 28-fifth sealing ring, 29-sixth sealing ring, 30-upper stirring rod, 31-stirring rod protective cover, 32-lower stirring rod. DETAILED DESCRIPTION

[0021] The present invention is described in detail and completely below with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on this description. Before describing the present invention with reference to the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including those described below, may be combined with each other unless they conflict.

[0022] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows: like Figure 1 As shown, an embodiment of the present invention provides an online powder feeding device for a carrier gas powder feeder, comprising: An upper powder bucket component 1 and a lower powder bucket component 3, wherein the lower portion of the upper powder bucket component 1 and the upper portion of the lower powder bucket component 3 are connected via the switching valve component 2, forming a powder feeding channel, which conveys powder to the powder feeding tray component 4, and then the powder feeding tray component 4 conveys the powder to the working area via the powder feeding pipe; A powder adding port 7 is provided on the upper portion of the upper powder barrel component 1 ; the powder adding port 7 can be opened to add powder into the upper powder barrel component 1 through the powder adding port 7 .

[0024] An air charging valve 8 is provided on the upper part of the upper powder barrel component 1 ; the air charging valve 8 is connected to the powder-carrying gas pipeline of the powder feeder, and the powder-carrying gas is injected into the upper powder barrel component 1 by switching the air charging valve 8 .

[0025] The switching valve component 2 is composed of an upper valve plate 9, a valve plate 10 and a lower valve plate 11 that are sealed together; the valve plate 10 changes its position in different ways to put the switching valve component 2 in a connected and isolated state, thereby realizing the connection and isolation of the space between the upper powder barrel component 1 and the lower powder barrel component 3.

[0026] The upper side portion of the upper powder barrel component 1 and the upper side portion of the lower powder barrel component 3 are connected via a connecting pipe component 5; The communication pipe component 5 is composed of an upper communication pipe 12 , a communication valve 13 and a lower communication pipe 14 . The communication pipe component 5 can connect and disconnect the spaces between the upper powder barrel component 1 and the lower powder barrel component 3 by switching the communication valve 13 .

[0027] The upper communicating pipe 12 is provided with an air release valve 15 and an upper pressure display gauge 16; the air release valve 15 can adjust the pressure of the powder-carrying gas inside the upper powder barrel component 1 and the upper communicating pipe 12 by opening and closing; the upper pressure display gauge 16 can display the pressure of the powder-carrying gas inside the upper powder barrel component 1 and the upper communicating pipe 12 in real time.

[0028] The lower communicating pipe 14 is provided with a lower pressure display gauge 17 ; the lower pressure display gauge 17 can display the pressure of the powder-carrying gas inside the lower powder barrel component 3 and the lower communicating pipe 14 in real time.

[0029] The upper powder barrel component 1, the switching valve component 2 and the middle of the lower powder barrel component 3 are penetrated from top to bottom by a stirring component 6. The stirring component 6 is provided with an upper stirring rod 30 and a stirring rod protective cover 31 in the upper powder barrel component 1. The upper stirring rod 30 continuously stirs the powder in the upper powder barrel component 1; the stirring component 6 is provided with a lower stirring rod 32 in the lower powder barrel component 3. The lower stirring rod 32 is coaxially and tightly connected with the upper stirring rod 30 to continuously stir the powder in the lower powder barrel component 3.

[0030] like Figure 1 and Figure 2 As shown, the switching valve component 2 is provided with a first powder channel hole 18, a second powder channel hole 19 and a third powder channel hole 20 from top to bottom, and the connection and disconnection of the powder channel are realized by changing the position of the second powder channel hole 19; the middle part of the switching valve component 2 is provided with a first through channel hole 21, a second through channel hole 22 and a third through channel hole 23 from top to bottom to realize the penetration of the stirring component 6 from top to bottom; the above components are sealed and connected.

[0031] like Figure 3 、 4 As shown, the upper valve plate 9 of the switching valve component 2 is provided with a plurality of first powder channel holes 18, and a first sealing ring 24 is provided around the first powder channel hole 18 to ensure the sealed isolation between the powder conveying channel and the space inside the valve; a second sealing ring 25 is provided around the edge of the upper valve plate 9 to ensure the sealed isolation between the space inside the valve and the external space; a first through channel hole 21 is provided in the center of the upper valve plate 9, and a third sealing ring 26 is installed in the first through channel hole 21 to ensure that the lower stirring rod 32 of the stirring component 6 passes through and is sealed.

[0032] like Figure 5 As shown, the valve plate 10 of the switching valve component 2 is provided with a plurality of second powder channel holes 19; a second through channel hole 22 is provided in the center of the valve plate 10, which is an oblong hole, to ensure that the stirring component 6 passing through from top to bottom can realize the switching action of connecting and disconnecting the powder channel through the valve plate 10.

[0033] like Figure 6 As shown, the lower valve plate 11 of the switching valve component 2 is provided with a plurality of third powder channel holes 20, and a fourth sealing ring 27 is provided around the third powder channel hole 20 to ensure the sealed isolation between the powder conveying channel and the valve inner space; a fifth sealing ring 28 is provided around the edge of the lower valve plate 11 to ensure the sealed isolation between the valve inner space and the external space; a third through channel hole 23 is provided in the center of the lower valve plate 11, and a sixth sealing ring 29 is installed in the third through channel hole 23 to ensure that the lower stirring rod 32 of the stirring component 6 passes through and is sealed.

[0034] The online powder adding method based on the device comprises the following steps: S1 normal powder feeding, the switching valve member 2 is in the connected state, the stirring member 6 continues to operate, the lower powder barrel member 3 to the powder feeding tray member 4 conveys powder; S2. When adding powder, close the connecting valve 13 and adjust the pressure of the upper powder barrel component 1 to the same as the lower powder barrel component 3 through the air release valve 15; S3. The sliding valve plate 10 cuts off the powder channel, opens the powder adding port 7 and adds powder to the upper powder barrel member 1; S4. After the powder is added, the sliding valve plate 10 connects to the powder channel, and the powder quickly flows into the lower powder barrel component 3 through the multiple channels, and the stirring component 6 simultaneously eliminates the residue.

[0035] Powder adding operation verification: Initial state: the switching valve is connected, the pressure of the lower powder barrel is 0.3 MPa, and the stirring speed is 60 rpm; Powder adding stage: close the connecting valve 13, open the air relief valve 15 to reduce the pressure of the upper powder bucket to 0.3MPa; slide the middle valve plate to cut off the channel, and add 5kg of powder; Resume powder feeding: the switching valve is reset, the powder flows completely into the lower powder barrel within 30 seconds, and the pressure fluctuation is <0.005MPa.

[0036] The results of the comparative experiment with the traditional multi-powder bucket system are shown in Table 1.

[0037] Table 1 Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. An online powder feeding device for a carrier gas powder feeder, characterized in that: include: An upper powder barrel component (1), a lower powder barrel component (3), a switching valve component (2), a connecting pipe component (5), and a stirring component (6); The upper powder barrel component (1) and the lower powder barrel component (3) are connected via the switching valve component (2) to form a powder conveying channel; The communicating pipe component (5) connects the upper side portion of the upper powder barrel component (1) and the upper side portion of the lower powder barrel component (3) to form a pressure balancing channel; The stirring component (6) penetrates the upper powder barrel component (1), the switching valve component (2) and the lower powder barrel component (3) from top to bottom, and continuously stirs the powder in the two powder barrels.

2. The online powder feeding device for a carrier gas powder feeder according to claim 1, characterized in that: The switching valve component (2) comprises an upper valve plate (9), a middle valve plate (10) and a lower valve plate (11), which are sealed and connected; The upper valve plate (9) is provided with a plurality of first powder passage holes (18), the middle valve plate (10) is provided with a plurality of second powder passage holes (19), and the lower valve plate (11) is provided with a plurality of third powder passage holes (20); The middle valve plate (10) can slide laterally so that the second powder channel hole (19) is aligned or misaligned with the first powder channel hole (18) and the third powder channel hole (20), thereby achieving connection or disconnection of the powder channel.

3. The online powder adding device for a carrier gas powder feeder according to claim 2, characterized in that: A first sealing ring (24) is provided around the first powder channel hole (18) to ensure sealing and isolation between the powder delivery channel and the space inside the valve; A second sealing ring (25) is provided around the edge of the upper valve plate (9) to ensure sealing isolation between the valve interior and exterior spaces; A fourth sealing ring (27) is provided around the third powder channel hole (20) to ensure sealing and isolation between the powder delivery channel and the space inside the valve; A fifth sealing ring (28) is provided around the edge of the lower valve plate (11) to ensure sealing and isolation between the valve interior space and the exterior space.

4. The online powder adding device for a carrier gas powder feeder according to claim 2, characterized in that: A first through-channel hole (21) is provided at the center of the upper valve plate (9), and a third sealing ring (26) is installed in the first through-channel hole (21) to ensure that the lower stirring rod (32) of the stirring component (6) passes through and is sealed; A second through-channel hole (22) is provided at the center of the middle valve plate (10), which is an oblong hole, to ensure that the stirring member (6) passing through from top to bottom passes through the middle valve plate (10) and adapts to the lateral sliding of the middle valve plate (10); A third through-channel hole (23) is provided at the center of the lower valve plate (11), and a sixth sealing ring (29) is installed in the third through-channel hole (23) to ensure that the lower stirring rod (32) of the stirring component (6) passes through and is sealed.

5. The online powder adding device for a carrier gas powder feeder according to claim 1, characterized in that: The communication pipe component (5) comprises an upper communication pipe (12), a communication valve (13) and a lower communication pipe (14); The upper communicating pipe (12) is provided with an air release valve (15) and an upper pressure display gauge (16), and the lower communicating pipe (14) is provided with a lower pressure display gauge (17); By adjusting the air release valve (15) and the communication valve (13), the internal pressures of the upper powder barrel component (1) and the lower powder barrel component (3) are dynamically balanced.

6. The online powder adding device for a carrier gas powder feeder according to claim 1, characterized in that: The stirring component (6) comprises an upper stirring rod (30) and a lower stirring rod (32) which are coaxially connected, wherein the upper stirring rod (30) is located in the upper powder barrel component (1) and is provided with a stirring rod protective cover (31), and the lower stirring rod (32) extends into the lower powder barrel component (3); The stirring component (6) keeps rotating continuously when the switching valve component (2) is in a connected or disconnected state.

7. The online powder adding device for a carrier gas powder feeder according to claim 3, characterized in that: The first powder channel hole (18), the second powder channel hole (19) and the third powder channel hole (20) of the switching valve component (2) are arranged in multiple groups and connected in parallel to form a powder adding channel with a large cross section.

8. The online powder adding device for a carrier gas powder feeder according to claim 7, characterized in that: A powder adding port (7) and an air charging valve (8) are provided on the top of the upper powder barrel component (1); the air charging valve (8) is connected to an external powder-carrying air source.

9. An online powder adding method based on the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. During normal powder feeding, the switching valve component (2) is in a connected state, the stirring component (6) continues to operate, and the lower powder barrel component (3) conveys powder to the powder feeding plate component (4); S2. When preparing to add powder, close the connecting valve (13) and adjust the pressure of the upper powder barrel component (1) to the same as that of the lower powder barrel component (3) through the air release valve (15); S3. The sliding valve plate (10) cuts off the powder passage, opens the powder adding port (7) and adds powder to the upper powder barrel member (1); S4. After the powder is added, the sliding valve plate (10) connects the powder channel, and the powder quickly flows into the lower powder barrel component (3) through the multiple channels, and the stirring component (6) simultaneously eliminates the residue.

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