A high-pressure powder feeder unit and its application

Abstract

The high-pressure powder feeder unit includes a driving unit, a powder storage unit and a powder tray unit which are arranged in sequence, the output end of the driving unit is connected to a driving shaft extending into the powder storage unit, the powder tray unit includes an upper powder tray and a lower powder tray, the upper powder tray includes a tray body, an air inlet is provided at the center of the tray body, an air overflow width is provided along the outer edge of the air inlet, the lower powder tray is a cover body with an annular recess structure, including a fixed boss at the center, and a powder tray shaft mounting hole is provided at the center of the fixed boss; the high-pressure powder feeder unit combines the driving unit, the powder storage unit and the powder tray unit together, and by improving the structures of the three, the sealing performance of the entire powder feeder unit is extremely good, which is suitable for high-pressure conditions, and the equipment is sufficient to meet the process requirements of production; the unit can be used under conditions where pressure is not required, and can simultaneously meet the needs of cold spraying, hot spraying and laser cladding technology, and is widely used with good market prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of laser surface modification, and in particular relates to a high-pressure powder feeder unit and application thereof. Background Art

[0002] The function of the powder feeder is to accurately feed the powder into the laser melting pool or spray it directly onto the substrate surface through a spray gun according to the requirements of the processing technology, and to ensure that the powder can be continuously, evenly and stably transported during the processing. According to different types of process characteristics and powder types, the types of powder feeders currently developed at home and abroad mainly include spiral powder feeders, turntable powder feeders, scraper powder feeders, capillary powder feeders, drum powder feeders, electromagnetic vibration powder feeders and boiling powder feeders.

[0003] In the production of cold spraying, thermal spraying, laser cladding and other products, the turntable powder feeder is a more commonly used one. The powder in the powder storage barrel falls into the narrow groove of the powder feeding disc through the powder inlet block by its own gravity. The powder feeding disc is driven by the powder feeding motor to rotate at a constant speed. When the powder in the narrow groove of the powder feeding disc reaches the powder outlet block, it is driven by the powder feeding carrier gas to enter the powder feeding pipe through the powder outlet joint. The turntable powder feeder is based on the principle of gas dynamics and uses the introduced gas as the carrier gas for powder transportation. This powder feeder is suitable for the transportation of spherical powders, and powders of different materials can be mixed and transported. The minimum powder shaft feeding rate can reach 1g / min. However, the conveying effect of powders of other shapes is not good, the powder feeding rate is uncontrollable during operation, and the dryness of the powder is required to be high. Slightly moist powder will affect the continuity and uniformity of powder feeding. And due to the widespread use of cold spraying technology, in order to enable the coating material to be smoothly introduced into the high-pressure gas jet, it is required to use a higher pressure gas to feed the coating material in the powder feeder into the spray gun.

[0004] The existing low-pressure powder feeder powder tray unit has only a lower powder tray but no upper powder tray, and only sliders with holes are provided at the powder inlet and the air outlet to achieve the conduction function of powder falling and powder discharge.

[0005] The existing powder feeding plate structure cannot meet the requirements of high-pressure gas delivery, and different powder feeding plates need to be replaced according to different process conditions of the products.

[0006] Application No. CN200710119324.7 discloses a cold spray high-pressure powder feeder, including a powder box, a conical groove, gas and powder inlet and outlet bolts, a tee and a high-pressure pipe. One end of the tee is connected to a high-pressure gas source, and the other two ends are respectively connected to a high-pressure pipe and a powder feeding gas inlet bolt. The high-pressure pipe is connected between the tee and the balance gas inlet by a threaded fastener, and the balance gas inlet bolt is connected to the top of the powder box. The powder box and the conical groove are connected by fine thread. Two internal threads are opened along a central axis at the lower end of the conical groove, which are respectively connected to the powder outlet bolt and the powder feeding gas inlet bolt. The threaded connection between each part improves the pressure resistance of each connection, does not leak, and the powder feeder can operate safely under high pressure; the tee is used to make the high-pressure gas used for powder feeding and balance respectively, which can save the high-pressure gas source on the one hand, and can automatically adjust the air pressure of the powder box and the lower end of the conical groove to balance on the other hand, so that the powder can be smoothly delivered; by adjusting the distance between the two bolts of the air inlet and the powder outlet, the powder delivery rate can be continuously changed; the middle section of the conical groove is processed into a platform, which is conducive to the fixation of the entire device. This structure does not involve the powder tray structure, and the powder feeding is not accurate enough.

[0007] In addition, the sealing performance of the existing powder feeding unit is difficult to be applied to high-pressure situations. The sealing effect often fails to meet the requirements of high-pressure equipment, and the equipment is difficult to meet the production process requirements.

[0008] After searching, no high-pressure powder feeder unit with good sealing properties suitable for both spraying and laser cladding technology was found. Summary of the invention

[0009] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a high-pressure powder feeder unit, which combines a driving unit, a powder storage unit and a powder tray unit together. By improving the structures of the three, the sealing performance of the entire powder feeder unit is extremely good. Under high pressure, the equipment is sufficient to meet the production process requirements; the unit can be suitable for working conditions with higher pressure, can meet the needs of spraying and laser cladding technology at the same time, is widely used, and has good market prospects.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] Disclosed is a high-pressure powder feeder unit, comprising a driving unit, a powder storage unit and a powder tray unit arranged in sequence, wherein the output end of the driving unit is connected to a driving shaft extending into the powder storage unit, and the powder storage unit comprises a powder storage tank body and an upper end cover and a lower end cover installed at both ends of the powder storage tank body;

[0012] The upper end cover is arranged at one end close to the driving unit, and is provided with a powder adding port and an air inlet of a powder storage tank; a placement cavity is arranged inside the upper end cover; and a powder outlet channel is arranged on the lower end cover;

[0013] The powder tray unit comprises an upper powder tray and a lower powder tray, the upper powder tray comprises a tray body, an air inlet is arranged at the center of the tray body, and an air overflow width is arranged along the outer edge of the air inlet; the air overflow width comprises an air vent inner ring structure and an air overflow guide surface structure connected to the air vent inner ring structure, a powder flow channel is circumferentially protruded from the edge of the air overflow guide surface structure, the powder flow channel comprises a powder flow convex groove, and the two ends of the powder flow convex groove are connected to a powder guide wing 1 and a powder guide wing 2; the ends of the powder guide wing 1 and the powder guide wing 2 are respectively provided with a powder inlet and an air and powder outlet; the powder inlet end of the powder guide wing 1 and the powder outlet end of the powder guide wing 2 are respectively abutted against the two ends of the air overflow guide surface structure; the powder outlet channel is connected to the powder inlet;

[0014] Extending from the powder inlet end toward the powder inlet, a fitting convex groove is provided at the end of the second powder guide wing; an inner ring fitting surface 1 is enclosed between the fitting convex groove and the overflow surface;

[0015] The outer periphery of the powder flow convex groove is provided with an outer ring fitting surface 1; the powder flow convex groove, the fitting convex groove and the outer edge of the disk body are arranged in a stepped manner;

[0016] The lower powder tray is a cover body with an annular recess structure, including a fixed boss at the center, a powder tray shaft mounting hole at the center of the fixed boss, an inner ring fitting surface 2 matched with the inner ring fitting surface 1 is provided on the outer side of the fixed boss; a powder flow groove is provided between the inner ring fitting surface 2 and the concentrically arranged outer ring fitting surface 2; the powder flow groove is matched with the powder flow convex groove.

[0017] The high-pressure powder feeder unit stacks the drive unit, powder storage unit and powder tray unit in sequence, which are fixed by bolts. A sealing device is used at the drive shaft and the powder tray shaft. Combined with the special design of the powder tray structure, the entire high-pressure powder feeder unit not only has a good sealing effect, but can also be used for 0~10MPa.

[0018] The existing powder tray unit does not have the upper powder tray, so there is no powder flow groove and overflow width to protect against possible powder overflow. Once the powder overflow problem occurs, it is easy to cause the lower powder tray to get stuck or even damaged. Especially under high-pressure conditions, the powder overflow problem is more likely to occur. The powder tray structure designed in the present invention can effectively solve the above problem.

[0019] In addition, the upper powder tray and the lower powder tray of the powder tray unit are closely matched, with good sealing effect, no other auxiliary structures are required, and the overall structure is economical and applicable; it can meet the needs of cold spraying, hot spraying, and laser cladding technology at the same time, and is more suitable for promotion.

[0020] Furthermore, the outer edges of the upper end cover and the lower end cover both protrude from the outer wall of the powder storage tank body; the powder storage tank body is a cylinder provided with connecting ears, and a funnel-shaped powder tank inner bucket is provided at the lower end.

[0021] Furthermore, a sealing device is provided around the driving shaft, and the other end is connected to the powder stirring rod via a coupling.

[0022] The sealing device here uses an O-ring and / or a Gly ring. According to the structural characteristics of the drive shaft, one or more O-rings or Gly rings can be installed around the drive shaft to achieve a better sealing effect, so that the powder to be clad will not overflow the powder storage unit, will not affect the use of the drive unit, and also reduce environmental pollution.

[0023] Furthermore, a sealing shell is provided outside the upper powder tray and the lower powder tray. This structural arrangement can also ensure a better sealing effect of the entire unit.

[0024] Furthermore, a Gly ring and / or an O-ring is circumferentially arranged at the end of the powder pan shaft.

[0025] Furthermore, the overflow guide surface structure is a fan-shaped structure; the powder guide wing 1 and the powder guide wing 2 are both arc-shaped groove structures with concave wings, and the edge height of the groove bottom is the same as the edge height of the fan-shaped structure.

[0026] Furthermore, the fan-shaped structure of the overflow guide surface structure presents a gradually rising arc surface from the edge of the air inlet to the powder flow convex groove.

[0027] Furthermore, the arc length of the ventilation inner ring structure is greater than or equal to 1 / 2 of the outer edge circumference of the air inlet of the upper powder tray, and the width of the ventilation inner ring structure is less than the width of the overflow guide surface structure.

[0028] Furthermore, the width of the ventilation inner ring structure is smaller than the width of the overflow guide surface structure.

[0029] Furthermore, the fixing boss is provided with mounting through holes in the circumference.

[0030] Furthermore, the width of the powder flow convex groove is smaller than the inner wall width of the powder flow concave groove, and the fitting convex groove fits with the inner wall of the powder flow concave groove with a slight gap.

[0031] Another object of the present invention is to disclose the application of the above-mentioned high-pressure powder feeder for use in laser cladding equipment or spraying material surface treatment.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The high-pressure powder feeder unit stacks the drive unit, powder storage unit and powder tray unit in sequence, which are fixed by bolts. A sealing device is used at the drive shaft and the powder tray shaft. Combined with the special design of the powder tray structure, the entire high-pressure powder feeder unit not only has a good sealing effect, but can also be used for high pressures of 0~10MPa.

[0034] This powder tray unit improves the structure of the upper powder tray, and scientifically arranges the overflow width and the powder flow channel, so that the gas enters from the air inlet, and is introduced into the powder flow channel through the overflow width to mix the gas with the powder, and the gas and powder flow to the air and powder outlet through the rotation of the powder tray. The air pressure is constant, and there will be no problems such as air pressure backflow and low powder conveying efficiency.

[0035] The powder tray unit is not likely to cause the lower powder tray to get stuck or even damaged during rotation, and especially under high pressure conditions, powder overflow will not occur, making it safer and more reliable to use.

[0036] In addition, the upper powder tray and the lower powder tray of the powder tray unit are closely matched, with good sealing effect, no other auxiliary structure is required, and the overall structure is economical and applicable; the entire high-pressure powder feeder unit can meet the needs of spraying and laser cladding technology at the same time, and is more suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the high-pressure powder feeder unit described in Example 1.

[0038] Figure 2 This is a cross-sectional view of the structural schematic diagram of the high-pressure powder feeder unit described in Example 1.

[0039] Figure 3 This is a schematic structural diagram of the upper powder tray of the high-pressure powder feeder unit described in Example 1.

[0040] Figure 4 This is a top view schematic diagram of the upper powder tray of the high pressure powder feeder unit described in Example 1.

[0041] Figure 5 This is a bottom view schematically showing the upper powder tray of the high pressure powder feeder unit described in Example 1.

[0042] Figure 6 This is a schematic structural diagram of the lower powder tray of the high-pressure powder feeder unit described in Example 1.

[0043] Among them, 100-drive unit, 200-powder storage unit, 201-upper end cover, 202-lower end cover, 203-powder storage tank body, 204-powder tank inner bucket, 205-powder adding port, 206-powder storage tank air inlet, 300-powder tray unit, 302 powder tray rotating connecting shaft sleeve, 400-drive shaft, 500-powder tray rotating shaft, 501-O-ring, 502-Glay ring 600-bearing, 700-powder stirring rod, 800-sealed shell, 801-powder tray upper end sealed shell, 802-powder tray lower end sealed shell, 803- Powder tray air inlet, 804-powder outlet and air outlet interface, 900-coupling, 1-upper powder tray, 2-air inlet, 3-overflow width, 31-ventilation inner ring structure, 32-overflow guide surface structure, 41-powder flow convex groove, 42-powder guide wing one, 43-powder guide wing two, 5-fitting convex groove, 6-powder inlet, 7-air outlet and powder outlet, 8-inner ring fitting surface one, 9-outer ring fitting surface one, 10-outer edge of tray body, 11-tray body, 1'-lower powder tray, 2'-powder tray shaft mounting hole, 8'-inner ring fitting surface two, 9'-outer ring fitting surface, 41'-powder flow groove. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0045] Example 1

[0046] like Figure 1 to Figure 6 As shown, the high-pressure powder feeder unit comprises a driving unit 100, a powder storage unit 200 and a powder tray unit 300 arranged in sequence, wherein the output end of the driving unit 100 is connected to a driving shaft 400 extending into the powder storage unit 200, and the driving unit 100 in this embodiment is a DC motor, one end of the driving shaft 400 is connected to the output end of the motor through a coupling 900, and the other end of the coupling 900 is connected to a powder stirring rod 700, and the powder storage unit 200 comprises a powder storage tank body 203 and an upper end cover 201 and a lower end cover 202 installed at both ends of the powder storage tank body 203; the outer edge diameters of the upper and lower end covers are both larger than the outer wall diameter of the powder storage tank body 203, and the structure of the powder storage tank body 203 is a cylinder provided with a connecting ear, and the connecting ear is fixed to the upper and lower end covers by bolts. A funnel-shaped powder tank inner hopper 204 is provided at the lower end of the powder storage tank body 203, and the powder is delivered to the powder tray unit 300 through the funnel opening of the powder tank inner hopper 204.

[0047] Specifically, the upper end cover 201 is arranged at one end close to the driving unit 100, and a powder adding port 205 and a powder storage tank air inlet 206 are provided on the upper end cover 201, and the powder adding port 205 and the powder storage tank air inlet 206 are respectively arranged on both sides of the upper end cover 201. In order to place the driving shaft 400, the bearing 600 and the stirring rod 700, a placement cavity is provided at the axis center inside the upper end cover 201; the inner wall of the placement cavity and the bearing 600 are clearance-matched. A sealing device is provided around the driving shaft 400, and a Gly ring is used as the sealing device here. According to the structural characteristics of the driving shaft 400, one or more O-rings or Gly rings can be installed around the driving shaft 400 to achieve a better sealing effect, so that the powder to be clad will not overflow the powder storage unit, will not affect the use of the driving unit, and also reduce environmental pollution.

[0048] A powder outlet channel is provided at the axis of the lower end cover 202 ; the powder outlet channel is connected to the powder inlet 6 of the powder storage unit 200 .

[0049] like Figure 3~Figure 6 The powder tray unit shown in the figure comprises an upper powder tray 1 and a lower powder tray 2, the upper powder tray 1 comprises a tray body 11, an air inlet 2 is provided at the center of the tray body 11, and an overflow surface 3 is provided along the outer edge of the air inlet 2; the overflow surface 3 comprises a ventilation inner ring structure 31 and an overflow guide surface structure 32 connected thereto, and the width of the ventilation inner ring structure 31 is smaller than the width of the overflow guide surface structure 32.

[0050] The edge of the overflow guide surface structure 32 is circumferentially protruding with a powder flow channel, and the overflow guide surface structure 32 is a fan-shaped structure; the powder guide wing 1 41 and the powder guide wing 2 42 have the same structure, both of which are arc-shaped groove structures with two wings concave, and the edge height of the groove bottom is the same as the edge height of the fan-shaped structure. The fan-shaped structure presents a gradually rising arc surface from the edge of the air inlet 2 to the powder flow convex groove. This setting makes it easier to guide powder into the powder flow convex groove 41, and the efficiency is higher.

[0051] The gas entering from the air inlet 2 spreads to the overflow guide surface structure 32 through the ventilation inner ring structure 31 . The overflow guide surface structure 32 is used to accurately guide the gas into the powder flow convex groove 41 .

[0052] Its powder flow channel includes a powder flow convex groove 41, and the two ends of the powder flow convex groove 41 are connected with a powder guide wing 1 42 and a powder guide wing 2 43; the ends of the powder guide wing 1 42 and the powder guide wing 2 43 are respectively provided with a powder inlet 6 and an air outlet 7; the powder inlet end of the powder guide wing 1 42 and the powder outlet end of the powder guide wing 2 43 are respectively abutted against the two ends of the overflow guide surface structure 32.

[0053] A fitting convex groove 5 is provided along the powder inlet end extending toward the powder inlet port 6 to the end of the second powder guide wing 43 ; an inner ring fitting surface 8 is enclosed between the fitting convex groove 5 and the overflow width 3 .

[0054] An outer ring fitting surface 9 is provided on the outer periphery of the powder flow convex groove 41; the powder flow convex groove 41, the fitting convex groove 5 and the outer edge 10 of the disk body are arranged in a stepped manner.

[0055] In order to ensure smooth gas flow and tighter connection between the upper and lower powder trays, the length of the ventilation inner ring structure 31 is scientifically designed, and the arc length of the ventilation inner ring structure 31 is greater than or equal to 1 / 2 of the outer circumference of the air inlet 2. In this embodiment, the ventilation inner ring structure 31 is selected to be greater than 1 / 2 of the outer circumference of the air inlet 2.

[0056] In order to ensure tight installation of the upper and lower powder trays, a mounting hole is provided on the tray body 11, and the mounting hole is matched with the through hole of the lower powder tray 1', and the upper and lower powder trays are fixed by fixing parts. The tray body 11 is provided with a powder inlet 6 and an air outlet and powder outlet 7.

[0057] The lower powder pan 1' is a cover body with a ring recess structure, including a powder pan rotating shaft 500 at the center, an O-ring 501 and a Gly ring are arranged around the powder pan rotating shaft 500, and a powder pan rotating connecting shaft sleeve 302 (built-in powder pan rotating connecting shaft) is installed at the lower end of the powder pan rotating shaft 500, which is connected to the motor through a coupling 900.

[0058] like Figure 3~Figure 6 The powder tray unit shown in the figure comprises an upper powder tray 1 and a lower powder tray 2, the upper powder tray 1 comprises a tray body 11, an air inlet 2 is provided at the center of the tray body 11, and an overflow surface 3 is provided along the outer edge of the air inlet 2; the overflow surface 3 comprises a ventilation inner ring structure 31 and an overflow guide surface structure 32 connected thereto, and the width of the ventilation inner ring structure 31 is smaller than the width of the overflow guide surface structure 32.

[0059] The edge of the overflow guide surface structure 32 is circumferentially protruding with a powder flow channel, and the overflow guide surface structure 32 is a fan-shaped structure; the powder guide wing 1 and the powder guide wing 2 have the same structure, both of which are arc-shaped groove structures with two wings concave, and the edge height of the groove bottom is the same as the edge height of the fan-shaped structure. The fan-shaped structure presents a gradually rising arc surface from the edge of the air inlet 2 to the powder flow convex groove. This arrangement makes it easier to guide powder into the powder flow convex groove 41, and the efficiency is higher.

[0060] The gas entering from the air inlet 2 spreads to the overflow guide surface structure 32 through the ventilation inner ring structure 31 . The overflow guide surface structure 32 is used to accurately guide the gas into the powder flow convex groove 41 .

[0061] Its powder flow channel includes a powder flow convex groove 41, and the two ends of the powder flow convex groove 41 are connected with a powder guide wing 1 42 and a powder guide wing 2 43; the ends of the powder guide wing 1 42 and the powder guide wing 2 43 are respectively provided with a powder inlet 6 and an air outlet 7; the powder inlet end of the powder guide wing 1 42 and the powder outlet end of the powder guide wing 2 43 are respectively abutted against the two ends of the overflow guide surface structure 32.

[0062] A fitting convex groove 5 is provided along the powder inlet end extending toward the powder inlet port 6 to the end of the second powder guide wing 43 ; an inner ring fitting surface 8 is enclosed between the fitting convex groove 5 and the overflow width 3 .

[0063] An outer ring fitting surface 9 is provided on the outer periphery of the powder flow convex groove 41; the powder flow convex groove 41, the fitting convex groove 5 and the outer edge 10 of the disk body are arranged in a stepped manner.

[0064] In order to ensure smooth gas flow and a tighter combination of the upper and lower powder trays, the length of the ventilation inner ring structure 31 is scientifically designed, and the arc length of the ventilation inner ring structure 31 is greater than or equal to 1 / 2 of the outer circumference of the air inlet 2. In this embodiment, the ventilation inner ring structure 31 is selected to be greater than 1 / 2 of the outer circumference of the air inlet 2 of the upper powder tray 1.

[0065] In order to ensure that the upper and lower powder pans are tightly mounted, mounting holes are provided on the pan body 11, and the mounting holes are matched with the through holes of the lower powder pan, and the upper and lower powder pans are fixed by fixing members. The pan body 11 is provided with a powder inlet 6 and an air outlet and powder outlet 7.

[0066] The lower powder tray 1' is a cover body with an annular recess structure, including a fixed boss with a powder tray shaft mounting hole 2' in the center, and an inner ring fitting surface 2' matched with the inner ring fitting surface 1 8 is provided on the outer side of the fixed boss; a powder flow groove 41' is provided between the inner ring fitting surface 2 8' and the concentrically arranged outer ring fitting surface 2 9'; the powder flow groove 41' is matched with the powder flow convex groove 41 .

[0067] Furthermore, the width of the powder flow convex groove 41 is smaller than the inner wall width of the powder flow concave groove 41 ′. The fitting convex groove 41 fits with the inner wall of the powder flow concave groove 41 ′ with a slight gap.

[0068] The width of the fitting convex groove 5 is equal to the inner wall width of the powder flow groove 41 .

[0069] In order to ensure tight installation of the upper and lower powder trays, installation through holes are provided around the fixed boss.

[0070] The working principle of this powder tray unit is:

[0071] The upper powder tray 1 and the lower powder tray 1' are coaxially assembled into a powder tray unit, wherein the upper powder tray 1 is fixedly installed and in a stationary state, and the lower powder tray 1' rotates at a constant speed around the central axis. Except for the powder inlet 6, the air inlet 2, the air and powder outlet 7, and the powder tray shaft mounting hole 2' of the lower powder tray, the rest of the entire powder tray unit is sealed by an external sealing module and isolated from the outside world.

[0072] The air pressure above and below the powder inlet 6 is equal and balanced, and the powder falls into the powder tray unit from the powder barrel through the powder inlet 6 by its own gravity. After entering the powder feeding tray structural module, it is shaped by the powder guide wing 1 42 and evenly enters the powder flow groove 41'. When the lower powder tray 1' rotates at a uniform speed, the powder is evenly distributed between the powder guide wing 1 42 and the powder guide wing 2 43 along the powder flow groove 41' of the lower powder tray 1'.

[0073] The working air pressure enters the overflow width 3 through the air inlet 2. The air pressure of the overflow width 3 is higher than the air pressure at the outer end of the air outlet and powder outlet 7, thereby forming a pressure difference between the inside and outside of the air outlet and powder outlet 7. The powder in the powder flow groove 41' is output to the outside of the powder tray unit through the powder guide wing 2 43 and the air outlet and powder outlet 7.

[0074] By adjusting the rotation speed of the lower powder tray 1' around the central axis, the powder flow rate output from the powder flow groove 41' through the powder guide wing 43 and the air outlet 7 to the outside of the powder tray unit in unit time can be controlled, thereby achieving the purpose of accurate powder delivery.

[0075] The powder flow convex groove 41 of the upper powder tray 1 is slightly fitted with the outer edge of the powder flow groove 41' of the lower powder tray 1', which can effectively prevent the powder in the powder flow groove 41' from overflowing the groove under the action of high pressure or rotating centrifugal force. In addition, the structural design of the overflow width 3 of the upper powder tray 1 can effectively ensure that the powder in the powder flow groove 41' is under balanced pressure, preventing the powder from locally bulging and overflowing to the center of the powder tray unit.

[0076] The fixing boss of the mounting hole 2' has an inner ring fitting surface 2' matched with the inner ring fitting surface 1 8 on its outer side; a powder flow groove 41' is provided between the inner ring fitting surface 2 8' and the concentrically arranged outer ring fitting surface 2 9'; and the powder flow groove 41' is matched with the powder flow convex groove 41 .

[0077] Furthermore, the width of the powder flow convex groove 41 is smaller than the inner wall width of the powder flow concave groove 41 ′. The width of the fitting convex groove 5 is equal to the inner wall width of the powder flow concave groove 41 .

[0078] In order to ensure the tight installation of the upper and lower powder trays, the fixed boss is provided with mounting holes in the circumference. In order to ensure the reliability and sealing of the high-pressure powder feeder unit, a sealing shell 800 is provided on the outside of the upper and lower powder trays. For example, the upper end sealing shell 801 of the powder tray and the lower end sealing shell 802 of the powder tray, the upper end sealing shell 801 of the powder tray is provided with a powder tray air inlet 803 for passing gas and a powder outlet and air outlet interface 804.

[0079] The working principle of this high pressure powder feeder unit is:

[0080] The required powder material is added into the powder storage tank body 203 through the powder adding port 205 , and the driving unit 100 drives the powder stirring rod 700 to rotate at a constant speed through the coupling 900 and the driving shaft 400 to stir the powder in the powder storage tank body 203 to evenly fall into the powder tray unit from the powder tank inner bucket 204 .

[0081] When the powder pan speed control command is issued, the servo motor (JSF 42-3-30-AS-1000) rotates at a constant speed according to the specified speed, and drives the lower powder pan 1' to rotate uniformly around the central axis through the coupling (DJM single SJM double diaphragm coupling steel sheet high torque screw flange coupling model DJM04-D104*L79.2) and the powder pan shaft.

[0082] The upper powder tray 1 and the lower powder tray 1' are coaxially assembled to form a multifunctional powder feeding tray structure, wherein the upper powder tray 1 is fixedly installed and is in a stationary state, and the lower powder tray 1' rotates at a constant speed around the central axis. Except for the powder inlet 6, the air inlet 2, the air and powder outlet 7, and the lower powder tray central rotating shaft mounting hole 2', the entire powder tray unit is sealed by an external sealing module and isolated from the outside world.

[0083] The air pressure above and below the powder inlet 6 of the powder tray unit 300 is equal and balanced. The powder falls into the powder tray unit 300 from the powder storage tank body through the powder inlet 6 by its own gravity. After entering the powder tray unit 300, it is shaped by the powder guide wing 1 42 and evenly enters the powder flow groove 41'. When the lower powder tray 1' rotates at a uniform speed, the powder is evenly distributed between the powder guide wing 1 42 and the powder guide wing 2 43 along the powder flow groove 41' of the lower powder tray 1'.

[0084] The working air pressure enters the overflow surface 3 through the air inlet 2. The air pressure of the overflow surface 3 is higher than the air pressure at the outer end of the air outlet and powder outlet 7, thereby forming a pressure difference between the inside and outside of the air outlet and powder outlet 7. The powder in the powder flow groove 41' passes through the powder guide wing 43 and the air outlet and powder outlet 7 to the outside of the powder tray unit 300.

[0085] By adjusting the rotation speed of the lower powder tray 1' around the central axis, the powder flow rate output from the powder flow groove 41' through the powder guide wing 43 and the air outlet 7 to the outside of the powder tray unit 300 per unit time can be controlled, thereby achieving the purpose of accurate powder delivery.

[0086] The powder flow convex groove 41 of the upper powder tray 1 is slightly fitted with the outer edge of the powder flow groove 41' of the lower powder tray 1', which can effectively prevent the powder in the powder flow groove 41' from overflowing the groove under the action of high pressure or rotating centrifugal force. In addition, the structural design of the overflow width 3 of the upper powder tray 1 can effectively ensure that the powder in the powder flow groove 41' is under balanced pressure, preventing the powder from locally bulging and overflowing to the center of the powder tray unit 300.

[0087] In this embodiment, the upper powder tray 1 and the lower powder tray 1' of the powder tray unit 300 are closely matched, with good sealing effect, no other auxiliary structure is required, and the overall structure is economical and applicable; the entire high-pressure powder feeder unit can meet the requirements of spraying and laser cladding technology at the same time, and is more suitable for promotion.

[0088] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high-pressure powder feeder unit, comprising a driving unit, a powder storage unit and a powder tray unit arranged in sequence, wherein the output end of the driving unit is connected to a driving shaft extending into the powder storage unit, characterized in that: The powder storage unit comprises a powder storage tank body and an upper end cover and a lower end cover installed at both ends of the powder storage tank body; The upper end cover is arranged at one end close to the driving unit, and is provided with a powder adding port and an air inlet of a powder storage tank; a placement cavity is arranged inside the upper end cover; and a powder outlet channel is arranged on the lower end cover; The powder tray unit comprises an upper powder tray and a lower powder tray, the upper powder tray comprises a tray body, an air inlet is arranged at the center of the tray body, and an air overflow width is arranged along the outer edge of the air inlet; the air overflow width comprises an air vent inner ring structure and an air overflow guide surface structure connected to the air vent inner ring structure, a powder flow channel is circumferentially protruded from the edge of the air overflow guide surface structure, the powder flow channel comprises a powder flow convex groove, and the two ends of the powder flow convex groove are connected to a powder guide wing 1 and a powder guide wing 2; the ends of the powder guide wing 1 and the powder guide wing 2 are respectively provided with a powder inlet and an air and powder outlet; the powder inlet end of the powder guide wing 1 and the powder outlet end of the powder guide wing 2 are respectively abutted against the two ends of the air overflow guide surface structure; the powder outlet channel is connected to the powder inlet; Extending from the powder inlet end toward the powder inlet, a fitting convex groove is provided at the end of the second powder guide wing; an inner ring fitting surface 1 is enclosed between the fitting convex groove and the overflow surface; The outer periphery of the powder flow convex groove is provided with an outer ring fitting surface 1; the powder flow convex groove, the fitting convex groove and the outer edge of the disk body are arranged in a stepped manner; The lower powder pan is a cover body with a ring recess structure, including a fixed boss at the center, a powder pan shaft mounting hole at the center of the fixed boss, an inner ring fitting surface 2 matched with the inner ring fitting surface 1 is provided on the outer side of the fixed boss; a powder flow groove is provided between the inner ring fitting surface 2 and the outer ring fitting surface 2 arranged concentrically; the powder flow groove is matched with the powder flow convex groove; The outer edges of the upper end cover and the lower end cover both protrude from the outer wall of the powder storage tank body. The powder storage tank body is a cylinder provided with connecting ears, and a funnel-shaped powder tank inner bucket is provided at the lower end.

2. The high pressure powder feeder unit according to claim 1, characterized in that: A sealing device is provided around the driving shaft, and the other end of the driving shaft is connected to the powder stirring rod through a coupling.

3. The high pressure powder feeder unit according to claim 1, characterized in that: A sealed shell is arranged outside the upper powder tray and the lower powder tray.

4. The high pressure powder feeder unit according to claim 1, characterized in that: A Gly ring and / or an O-ring is circumferentially arranged at the end of the powder pan rotating shaft.

5. The high pressure powder feeder unit according to claim 1, characterized in that: The overflow guide surface structure is a fan-shaped structure; the powder guide wing 1 and the powder guide wing 2 are both arc-shaped groove structures with concave wings, and the edge height of the groove bottom is the same as the edge height of the fan-shaped structure.

6. The high pressure powder feeder unit according to claim 5, characterized in that: The fan-shaped structure of the overflow guide surface structure presents a gradually rising arc surface from the edge of the air inlet to the powder flow convex groove.

7. The high pressure powder feeder unit according to claim 1, characterized in that: The arc length of the ventilation inner ring structure is greater than or equal to 1 / 2 of the outer edge circumference of the air inlet of the upper powder plate; the width of the ventilation inner ring structure is less than the width of the overflow guide surface structure.

8. The high pressure powder feeder unit according to claim 1, characterized in that: The width of the powder flow convex groove is smaller than the inner wall width of the powder flow concave groove; the width of the fitting convex groove is equal to the inner wall width of the powder flow concave groove and fits with a slight gap.

9. An application of the high pressure powder feeder unit according to any one of claims 1 to 8, characterized in that: Used in laser cladding equipment or spraying material surface treatment.

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