A metal powder screening apparatus

Abstract

The utility model relates to screening equipment technical field, concretely relates to a metal powder screening equipment, the utility model provides a metal powder screening equipment, including spiral sorting mechanism, spiral sorting mechanism includes stand and installs spiral sorting ware on stand, spiral sorting ware includes spiral board, spiral board is helical, the inner edge of spiral board is higher than its outer edge, the outer edge department of spiral board is equipped with spiral groove, spiral groove sets up along the spiral direction of spiral board, a plurality of sorting holes are arranged and are equipped with along the spiral direction of spiral board on spiral board. Utilize this spiral sorting mechanism basically can separate spheroidal metal powder alone, and the sorting efficiency is high, and the speed is fast, and the structure of spiral sorting mechanism is simple, and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment technology, specifically to a metal powder screening device. Background Technology

[0002] Centrifugal atomization is a process technology that uses mechanical rotation to generate centrifugal force to break up molten metal streams and prepare powders. This technology falls under the category of single-flow atomization powder production, avoiding the media inclusion problems present in two-flow methods. It is mainly divided into rotating disk atomization and rotating electrode atomization. Its core process involves dropping molten metal droplets onto a high-speed rotating device (typically reaching tens of thousands of rpm), using centrifugal force to break the molten metal stream into micron-sized droplets, which then rapidly solidify in an inert gas environment. This process can produce metal powders with high sphericity and uniform composition, with particle sizes typically ranging from 25-200 μm, and is widely used in additive manufacturing, powder metallurgy, and other fields.

[0003] During centrifugal atomization, the molten metal stream is initially broken into droplets of varying sizes. These droplets are ejected at high speed and rapidly solidify in an inert gas environment. If the droplets do not have sufficient time to complete spheroidization during cooling, they will form non-spherical structures due to rapid solidification. In addition, during atomization, large droplets may adsorb smaller particles to form satellite powder, or droplets may undergo secondary breakage after collision, resulting in non-spherical structures. Furthermore, droplets may collide with the collector wall or other components within the atomization chamber during ejection, sputtering into non-spherical structures before being fully cooled.

[0004] Non-spherical metal powders can be broadly classified by shape into disc-shaped, needle-shaped (teardrop-shaped), and other irregular metal powders. Currently, sieves can separate disc-shaped and needle-shaped powders that differ significantly in size from spherical powders (particle size approximately 150-380 micrometers). For example, application number 201711393533.0 describes a device and method for sieving irregularly shaped powders from spherical metal powders. After initial sieving, some powders with lengths (sizes) similar to spherical powders are difficult to separate effectively, resulting in poor sieving performance. Utility Model Content

[0005] (I) The problem to be solved by this utility model is that some powders with a length (size) similar to spherical powders are difficult to be effectively screened out after the initial screening of the powder, resulting in poor screening effect.

[0006] (II) Technical Solution

[0007] A metal powder screening device includes a spiral sorting mechanism, wherein the spiral sorting mechanism includes a column and a spiral sorter mounted on the column;

[0008] The spiral sorter includes a spiral plate, which is spiral-shaped. The inner edge of the spiral plate is higher than its outer edge. A spiral groove is provided at the outer edge of the spiral plate, and the spiral groove is arranged along the spiral direction of the spiral plate. A plurality of sorting holes are arranged on the spiral plate along the spiral direction. The sorting holes extend from the inner edge of the spiral plate to the outer edge of the spiral plate. The end of the sorting hole away from the inner edge of the spiral plate is connected to the spiral groove. The projection of the spiral plate in the vertical direction does not exceed 360°.

[0009] When spherical metal powder, disc-shaped metal powder, and needle-shaped metal powder enter the sorting hole, the disc-shaped metal powder and the needle-shaped metal powder pass through the sorting hole, and the spherical metal powder rolls along the sorting hole into the spiral groove.

[0010] According to one embodiment of the present invention, the cross-section of the sorting hole is an isosceles trapezoid, and the opening of the sorting hole gradually increases from the lower surface to the upper surface of the spiral plate.

[0011] According to one embodiment of the present invention, a protective plate is provided on the outer edge of the spiral plate, and the protective plate is spirally arranged along the spiral direction of the spiral plate. The protective plate is used to prevent the spherical metal powder from rolling out of the spiral groove.

[0012] According to one embodiment of the present invention, the discharge end of the spiral groove is provided with a guide tube, the guide tube is connected to the spiral groove, and the projection of the outlet of the guide tube in the vertical direction falls outside the projection of the spiral plate in the vertical direction.

[0013] According to one embodiment of the present invention, the spiral sorting mechanism includes a spiral feeder, the spiral feeder includes a spiral feed plate, the spiral feed plate is spiral-shaped, the spiral feed plate is installed on the column and located above the spiral plate, the projection of the spiral feed plate in the vertical direction falls completely onto the spiral plate, the spiral feed plate is close to the inner edge of the spiral plate and away from the outer edge of the spiral plate, and the bottom surface of the spiral feed plate is provided with a plurality of through holes for metal powder to pass through.

[0014] According to one embodiment of the present invention, the spiral fabric plate is provided with protective edges on both its inner and outer edges.

[0015] According to one embodiment of the present invention, the spiral sorting mechanism includes a collection hopper, which is funnel-shaped and fixed to the column and lower than the spiral plate. The axis of the collection hopper is not collinear with the axis of the column, the outlet of the collection hopper is completely offset from the column, and the projection of the spiral plate in the vertical direction falls completely into the collection hopper.

[0016] According to one embodiment of the present invention, a third collection box and a fourth collection box are included, the third collection box being located below the outlet of the guide pipe and the fourth collection box being located below the outlet of the hopper.

[0017] According to one embodiment of the present utility model, it includes a frame structure, a bin body, and a first screening structure, a second screening structure, a feeding hopper, a discharging hopper, and a receiving hopper installed inside the bin body;

[0018] The bin is mounted on the frame mechanism and is higher than the spiral sorting mechanism. The top of the bin is provided with a feed inlet.

[0019] The first end of the first screening structure is higher than its second end, the first end of the second screening structure is higher than its second end, the second end of the first screening structure is higher than the first end of the second screening structure, the first end of the first screening structure is located directly below the feed inlet, and the aperture of the second screening structure is larger than the aperture of the first screening structure.

[0020] The first end of the discharge hopper is higher than its second end, and the first end of the discharge hopper is located below the second end of the second screening structure, and the second end of the discharge hopper extends out of the hopper body;

[0021] The first end of the feeding hopper is higher than its second end, the first end of the feeding hopper is located below the first screening structure, the feeding hopper is used to receive metal powder passing through the first screening structure, and the second end of the feeding hopper extends out of the hopper body;

[0022] The receiving hopper is arranged below the second screening structure to receive metal powder passing through the second screening structure, and the outlet of the receiving hopper is located above the top of the spiral feeder.

[0023] According to one embodiment of the present invention, a first collection box and a second collection box are included. The first collection box and the second collection box are placed on a frame mechanism. The first collection box is located below the second end of the discharge hopper, and the second collection box is located below the second end of the discharge hopper.

[0024] The beneficial effects of this utility model are: the spiral sorting mechanism can basically separate spherical metal powders individually, with high sorting efficiency and speed, and the spiral sorting mechanism has a simple structure and is easy to use. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A perspective view provided for an embodiment of this utility model;

[0027] Figure 2 A cross-sectional view provided for an embodiment of this utility model;

[0028] Figure 3 Structural diagrams of the spiral sorting mechanism, the third collection box, and the fourth collection box provided in this embodiment of the utility model;

[0029] Figure 4 A structural diagram of the spiral sorter provided in an embodiment of this utility model;

[0030] Figure 5 This is an internal structural diagram of the hopper provided in an embodiment of the present utility model.

[0031] Icons: 1. Bin body; 2. Support frame; 3. Spiral sorting mechanism; 4. First collection box; 5. Second collection box; 6. Third collection box; 7. Fourth collection box; 8. First screening structure; 9. Second screening structure; 10. Discharge hopper; 11. Receiving hopper; 12. Column; 13. Spiral separator; 131. Sorting hole; 132. Spiral groove; 133. Guide tube; 14. Spiral distributor; 141. Through hole; 15. Collection hopper; 16. Feed hopper; 17. Discharge hopper. Detailed Implementation

[0032] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] like Figures 1-5 As shown, one embodiment of the present invention provides a metal powder screening device, including a spiral sorting mechanism 3, the spiral sorting mechanism 3 including a column 12 and a spiral sorter 13 installed on the column 12;

[0034] The spiral sorter 13 includes a spiral plate, which is spiral in shape. The inner edge of the spiral plate is higher than its outer edge. A spiral groove 132 is provided at the outer edge of the spiral plate. The spiral groove 132 is arranged along the spiral direction of the spiral plate. A plurality of sorting holes 131 are arranged along the spiral direction of the spiral plate. The sorting holes 131 extend from the inner edge of the spiral plate to the outer edge of the spiral plate. The end of the sorting hole 131 away from the inner edge of the spiral plate is connected to the spiral groove 132. The projection of the spiral plate in the vertical direction does not exceed 360°.

[0035] When spherical metal powder, disc-shaped metal powder, and needle-shaped metal powder enter the sorting hole 131, the disc-shaped metal powder and the needle-shaped metal powder pass through the sorting hole 131, while the spherical metal powder rolls along the sorting hole 131 into the spiral groove 132.

[0036] It should be noted that after the metal powder undergoes preliminary sieving using screening equipment, some very fine metal powders (typically tens of micrometers) or large metal powders (a few millimeters to tens of millimeters) are sieved out. At this point, the processed metal powder (hereinafter collectively referred to as metal powder) contains spherical metal powders (particle size approximately 150-380 micrometers), disc-shaped metal powders, and needle-shaped (droplet-shaped) metal powders of similar size. It is important to clarify that "similar size" here can be understood as meaning that the diameter of the disc-shaped metal powders, the length of the needle-shaped metal powders, and the diameter of the spherical metal powders are similar.

[0037] In this embodiment, the cross-section of the sorting hole 131 is an isosceles trapezoid. From the lower surface of the spiral plate to its upper surface, the opening of the sorting hole 131 gradually increases. The minimum width of the opening of the sorting hole 131 is 120-140 micrometers, preferably 130 micrometers.

[0038] When using this spiral sorting mechanism 3 to screen the metal powder after preliminary screening, the metal powder is first fed into the top feed port of the spiral plate. Note that the powder should be fed from the inside of the feed port. Since the inner edge of the spiral plate is higher than its outer edge, and the number of sorting holes 131 is sufficient and densely arranged, the metal powder will enter the sorting holes 131 from the inner edge of the spiral plate. Since the minimum width of the sorting hole 131 (130 micrometers) is smaller than the diameter of spherical metal powder (150 micrometers-380 micrometers), but larger than the width of disc-shaped metal powder and larger than the width of needle-shaped metal powder, the needle-shaped and disc-shaped metal powder will slide down along the inner wall of the sorting hole 131 and pass through the sorting hole 131, while the spherical metal powder cannot pass through the sorting hole 131 and can only roll along the sorting hole 131 and enter the spiral groove 132, and finally spiral down along the spiral groove 132 and roll out of the spiral plate.

[0039] It can be seen that the spiral sorting mechanism 3 can basically separate spherical metal powders separately, with high sorting efficiency and fast speed. Moreover, the spiral sorting mechanism 3 has a simple structure and is easy to use.

[0040] It should be noted that this spiral sorting mechanism 3 cannot guarantee that the spherical metal powders screened out will not contain needle-shaped or disc-shaped metal powders. It can only be said that the proportion of needle-shaped or disc-shaped metal powders in the spherical metal powders screened out is extremely small.

[0041] In this embodiment, as Figure 3 As shown, the spiral sorting mechanism 3 includes a spiral feeder 14, which includes a spiral feed plate. The spiral feed plate is spiral-shaped and is mounted on the column 12 and located above the spiral plate. The width of the spiral feed plate is approximately one-quarter to one-fifth of the width of the spiral plate. The projection of the spiral feed plate in the vertical direction falls completely onto the spiral plate.

[0042] Furthermore, the inner edge of the spiral fabric plate is close to the inner edge of the spiral plate, while the outer edge of the spiral fabric plate is further away from the outer edge of the spiral plate. In other words, there is a certain distance between the outer edge of the spiral fabric plate and the outer edge of the spiral plate. Additionally, the bottom surface of the spiral fabric plate is provided with multiple through holes 141 for metal powder to pass through. These through holes 141 are sufficient for spherical, needle-shaped, and disc-shaped metal powders to pass through. The maximum width of the through holes 141 can be greater than 550 micrometers, preferably 600 micrometers.

[0043] This allows workers to feed metal powder onto the top inlet of the spiral feed plate. As the metal powder slides along the spiral direction of the feed plate, it passes through the through-hole 141 at the bottom of the feed plate and falls onto the spiral separator 13. This method utilizes the spiral feed plate to distribute the metal powder relatively evenly, maximizing the coverage of the spiral plate and thus improving the utilization rate of the sorting holes 131 on the spiral plate.

[0044] It should be noted that the cross-section of the spiral feed plate is concave, meaning that the left and right sides of the spiral feeder 14 have protective edges. The protective edges are mainly used to prevent metal powder from sliding out of the spiral feeder 14.

[0045] It is important to note that the projection of the spiral plate in the vertical direction does not exceed 360°, or in other words, the projection of the spiral plate in the vertical direction is a large arc, meaning that the beginning and end of the projection of the spiral plate in the vertical direction are not connected. With this configuration, the projections of the spiral plate in the vertical direction will not overlap, which means that the disc-shaped and needle-shaped metal powders falling from the upper layer of the spiral plate will not fall onto the lower layer of the spiral plate.

[0046] In this embodiment, the length of the spiral fabric plate is shorter than the length of the spiral plate, and the vertical projection of the spiral fabric distributor 14 falls entirely onto the spiral plate. In other words, the spiral fabric distributor 14 does not extend beyond the spiral plate in any part. This ensures that all the metal powder passing through the spiral fabric plate falls onto the spiral plate instead of directly onto the ground.

[0047] Furthermore, it should be noted that this spiral sorting mechanism 3 is usually arranged in a sealed factory building, and since it is metal powder, it is impossible for the metal powder falling from the spiral feeder 14 to be blown away by external wind.

[0048] In this embodiment, the vertical distance between the spiral plate and the spiral fabric plate is 5cm-10cm, preferably 5cm. This minimizes the vertical distance between the spiral plate and the spiral fabric plate so that the metal powder inside the spiral fabric plate can fall onto the spiral plate quickly, shortening the falling distance and time of the metal powder.

[0049] In this embodiment, the sorting holes 131 on the spiral plate are elongated, meaning that the length of the sorting holes 131 is much greater than their maximum width. This ensures that most of the disc-shaped or needle-shaped metal powder can smoothly enter and pass through the sorting holes 131.

[0050] It should be noted that the appendix Figure 3 and appendix Figure 4 The sorting holes 131 on the spiral plate are only schematic diagrams to make the sorting holes 131 clear. In reality, the sorting holes 131 are densely arranged, and the minimum width of the sorting holes 131 is 130 micrometers, and the maximum width is 500-600 micrometers.

[0051] In this embodiment, the spiral groove 132 is as follows Figure 4 As shown, it is roughly a V-shaped groove, and the minimum width of the spiral groove 132 is 450 micrometers to 600 micrometers, preferably 500 micrometers, so that the spherical metal powder can roll out along the inner bottom wall of the spiral groove 132.

[0052] In this embodiment, a protective plate 134 is provided above the outer edge of the spiral plate. The protective plate 134 is spirally arranged along the spiral direction of the spiral plate, and the length of the protective plate 134 is equal to the length of the outer edge of the spiral plate. The purpose of providing the protective plate 134 is to prevent spherical metal powder from rolling out of the spiral groove 132.

[0053] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, a guide tube 133 is provided at the discharge end of the bottom of the spiral groove 132. The guide tube 133 is connected to the spiral groove 132. The projection of the outlet of the guide tube 133 in the vertical direction falls outside the projection of the spiral plate in the vertical direction. Furthermore, a third collection box 6 is arranged directly below the outlet end of the guide tube 133.

[0054] A collecting hopper 15 is arranged below the spiral plate. The collecting hopper 15 is a conical funnel, and its axis is not collinear with the axis of the column 12. The outlet of the collecting hopper 15 is completely offset from the column 12. A circular hole is provided on the collecting hopper 15 for the column 12 to pass through. The column 12 passes through the circular hole on the inner wall of the collecting hopper 15 and is fixed to the column 12 by a connector. In addition, the projection of the spiral plate in the vertical direction falls completely into the collecting hopper 15. In this way, metal powder falling from the spiral plate can fall vertically into the collecting hopper 15 without the influence of the external environment.

[0055] Furthermore, a fourth collection box 7 is arranged directly below the bottom outlet of the collection hopper 15.

[0056] The disc-shaped and needle-shaped metal powders falling from the sorting holes 131 of the spiral plate will fall directly into the collecting hopper 15, and eventually into the fourth collecting box 7. Meanwhile, the spherical metal powders in the spiral groove 132 will roll along the spiral groove 132 into the guide tube 133, and finally fall from the guide tube 133 into the third collecting box 6. This effectively collects the metal powders.

[0057] In this embodiment, the distance between the top surface of the collecting hopper 15 and the lowest point of the spiral plate is 3cm-5cm. By minimizing the height difference between the collecting hopper 15 and the spiral plate, the descent distance and falling time of the metal powder falling from the spiral plate are reduced.

[0058] In this embodiment, the projection of the outlet of the guide tube 133 in the vertical direction falls outside the projection of the spiral plate in the vertical direction. The purpose of this arrangement is to ensure that the spherical metal powder rolling out of the spiral groove 132 will not fall into the collection hopper 15.

[0059] In summary, when using this spiral sorting mechanism 3 to screen metal powder, the processed metal powder (including spherical, flake, and needle-shaped metal powder) is fed into the top opening of the spiral feeder 14. As the metal powder slides or rolls along the spiral feeder 14, it passes through the through-hole 141 at the bottom of the spiral feeder 14 and falls into the inner side of the spiral separator 13, thus entering the sorting hole 131 of the spiral separator 13. Because the inner edge of the spiral plate is higher than its outer edge, and the minimum width of the sorting hole 131 is less than... The diameter of the spherical metal powder is greater than the width of the disc-shaped metal powder and the width of the needle-shaped metal powder. Therefore, the needle-shaped and disc-shaped metal powders slide down the inner wall of the sorting hole 131 and pass through the sorting hole 131, falling into the collection hopper 15, and then falling from the bottom outlet of the collection hopper 15 into the fourth collection box 7. The spherical metal powder rolls along the sorting hole 131 and enters the spiral groove 132, then spirals down along the spiral groove 132, rolls out of the spiral plate, and falls into the third collection box 6 after passing through the guide tube 133.

[0060] It is evident that the spiral sorting mechanism 3 can effectively separate spherical metal powders separately, with high sorting efficiency. The spherical metal powders separated are basically free of disc-shaped or needle-shaped metal powders, and spherical metal powders, disc-shaped and needle-shaped metal powders can be collected separately.

[0061] In some embodiments, a vibrating motor can be installed at the bottom of the spiral separator 13, which can improve the screening efficiency of the spiral separator 13 when it is working; a vibrating motor can be installed at the bottom of the spiral feeder 14, which can improve the discharge efficiency of metal powder on the spiral feeder 14 when it is working.

[0062] In this embodiment, the metal powder screening equipment also includes a preliminary screening device, which includes a frame structure, a hopper 1, and a first screening structure 8, a second screening structure 9, a feeding hopper 17, a discharge hopper 10, a receiving hopper 11, a first collection box 4, and a second collection box 5 installed inside the hopper 1.

[0063] The bin body 1 is installed on the frame mechanism and is higher than the spiral sorting mechanism 3. The top of the bin body 1 is provided with a feed inlet and a feed hopper 16 is installed at the feed inlet.

[0064] In this embodiment, the first screening structure 8, the second screening structure 9, and the discharge hopper 10 are arranged sequentially from left to right inside the hopper 1. The left end of the first screening structure 8 is higher than its right end, the left end of the second screening structure 9 is higher than its right end, and the right end of the first screening structure 8 is higher than the left end of the second screening structure 9. The vertical projection of the right end outlet of the first screening structure 8 falls on the second screening structure 9. The left end of the first screening structure 8 is located directly below the feed hopper 16, and the vertical projection of the outlet of the feed hopper 16 falls completely into the first screening structure 8, thereby ensuring that all the metal powder falling from the feed hopper 16 falls onto the first screening structure 8.

[0065] In this embodiment, as Figure 5 As shown, the discharge hopper 10 is installed at an angle on the inner bottom wall of the silo body 1. The first end of the discharge hopper 10 is higher than its second end, and the first end of the discharge hopper 10 is located directly below the right end of the second screening structure 9. The second end of the discharge hopper 10 extends out of the silo body 1. The second collection box 5 is set on the frame mechanism and located below the second end of the discharge hopper 10. In this way, the metal powder rolling out from the second screening structure 9 will fall directly into the first end of the discharge hopper 10, and then roll out along the discharge hopper 10 into the second collection box 5.

[0066] In this embodiment, the first end of the feeding hopper 17 is higher than its second end, and the feeding hopper 17 is located below the first screening structure 8. The feeding hopper 17 is used to receive metal powder passing through the first screening structure 8, and the second end of the feeding hopper 17 extends out of the hopper body 1. The first collection box 4 is disposed on the frame mechanism, and the first collection box 4 is located directly below the second end of the feeding hopper 17. In this way, the metal powder passing through the first screening structure 8 will fall directly into the feeding hopper 17, and then slide along the feeding hopper 17 and fall into the first collection box 4.

[0067] It should be noted that the receiving hopper 11 is arranged directly below the second screening structure 9 to receive the metal powder passing through the second screening structure 9. The outlet of the receiving hopper 11 extends out of the bin body 1, and the outlet of the receiving hopper 11 is located directly above the top of the spiral feeder 14.

[0068] In this embodiment, the first screening structure 8 includes a first screen and a first trapezoidal plate connected together. The first screen has multiple first screening holes. The width of the first trapezoidal plate gradually decreases from left to right. Furthermore, a vertically arranged first guard plate is provided on both the front and rear sides of the first screening structure 8, preventing metal powder from rolling out from the front and rear sides of the first screening structure 8. The second screening structure 9 includes a second screen and a second trapezoidal plate connected together. The second screen has multiple second screening holes. The width of the second trapezoidal plate gradually decreases from left to right. Furthermore, a vertically arranged second guard plate is provided on both the front and rear sides of the second screening structure 9, preventing metal powder from rolling out from the front and rear sides of the second screening structure 9. Additionally, the vertical projection of the first trapezoidal plate of the first screening structure 8 at least partially falls onto the second screening structure 9. The vertical projection of the second trapezoidal plate of the second screening structure 9 falls into the discharge hopper 10.

[0069] In addition, the projection of the first screen in the vertical direction falls completely into the feed hopper 17, thereby ensuring that all the metal powder passing through the first screen falls into the feed hopper 17; the projection of the second screen in the vertical direction falls completely into the receiving hopper 11, thereby ensuring that all the metal powder passing through the second screen falls into the receiving hopper 11.

[0070] In this embodiment, the first screen has a mesh size of 100 and an aperture of 150 micrometers; the second screen has a mesh size of 30 and an aperture of 550 micrometers.

[0071] Thus, when the metal powder (containing spherical metal powder, disc-shaped metal powder, needle-shaped metal powder, and some other irregular metal powder) is poured into the feed hopper 16, the metal powder first falls onto the first screening structure 8. Since the aperture of the first screening hole is 150 micrometers, metal powder smaller than 150 micrometers will pass through the first screening hole and fall into the discharge hopper 17, and then fall into the first collection box 4 along the discharge hopper 17.

[0072] Metal powder larger than 150 micrometers will roll along the first screening structure 8 to the second screening structure 9. At this time, since the aperture of the second screening hole is 550 micrometers, metal powder smaller than 550 micrometers will pass through the second screen and enter the receiving hopper 11 and eventually fall from the receiving hopper 11 into the spiral feeder 14.

[0073] Metal powder larger than 550 micrometers will roll out along the second screening structure 9 into the discharge hopper 10, and eventually fall from the discharge hopper 10 into the second collection box 5.

[0074] Preferably, a vibrating motor is installed on the bottom surface of the first screening structure 8, the bottom surface of the second screening structure 9, the bottom surface of the feeding hopper 17, and the bottom surface of the discharge hopper 10, respectively, so as to improve the screening and feeding efficiency.

[0075] It is evident that this preliminary screening equipment can remove small and large metal powders that deviate significantly from the size of spherical metal powders, thus paving the way for subsequent screening work.

[0076] Optional, such as Figure 2 As shown, the frame mechanism includes two support frames 2, with the storage compartment 1 installed between the two support frames 2. Furthermore, a support beam is welded between the two support frames 2, and the first collection box 4 and the second collection box 5 are placed on this support beam. It should be noted that in this embodiment, the specific structure of the frame mechanism is not specifically limited; any reasonable design is acceptable.

[0077] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0079] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A metal powder screening device, characterized in that, It includes a spiral sorting mechanism (3), which includes a column (12) and a spiral sorter (13) mounted on the column (12); The spiral sorter (13) includes a spiral plate, which is spiral in shape. The inner edge of the spiral plate is higher than its outer edge. A spiral groove (132) is provided at the outer edge of the spiral plate. The spiral groove (132) is arranged along the spiral direction of the spiral plate. A plurality of sorting holes (131) are arranged along the spiral direction of the spiral plate. The sorting holes (131) extend from the inner edge of the spiral plate to the outer edge of the spiral plate. The end of the sorting hole (131) away from the inner edge of the spiral plate is connected to the spiral groove (132). The projection of the spiral plate in the vertical direction does not exceed 360°. When spherical metal powder, disc-shaped metal powder and needle-shaped metal powder enter the sorting hole (131), the disc-shaped metal powder and the needle-shaped metal powder pass through the sorting hole (131), and the spherical metal powder rolls along the sorting hole (131) into the spiral groove (132).

2. The metal powder screening device according to claim 1, characterized in that, The cross-section of the sorting hole (131) is an isosceles trapezoid, and the opening of the sorting hole (131) gradually increases from the lower surface to the upper surface of the spiral plate.

3. The metal powder screening device according to claim 1, characterized in that, A protective plate (134) is provided on the outer edge of the spiral plate. The protective plate (134) is spirally arranged along the spiral direction of the spiral plate. The protective plate (134) is used to prevent the spherical metal powder from rolling out of the spiral groove (132).

4. A metal powder screening device according to claim 3, characterized in that, The discharge end of the spiral groove (132) is provided with a guide tube (133), which is connected to the spiral groove (132). The projection of the outlet of the guide tube (133) in the vertical direction falls outside the projection of the spiral plate in the vertical direction.

5. A metal powder screening device according to claim 4, characterized in that, The spiral sorting mechanism (3) includes a spiral feeder (14), which includes a spiral feed plate. The spiral feed plate is spiral-shaped and is mounted on the column (12) and located above the spiral plate. The projection of the spiral feed plate in the vertical direction falls completely onto the spiral plate. The spiral feed plate is close to the inner edge of the spiral plate and away from the outer edge of the spiral plate. The bottom surface of the spiral feed plate is provided with a plurality of through holes (141) for metal powder to pass through.

6. A metal powder screening device according to claim 5, characterized in that, The spiral fabric plate has protective edges on both its inner and outer edges.

7. A metal powder screening device according to claim 5, characterized in that, The spiral sorting mechanism (3) includes a collection hopper (15), which is funnel-shaped. The collection hopper (15) is fixed on the column (12) and is lower than the spiral plate. The axis of the collection hopper (15) is not collinear with the axis of the column (12). The outlet of the collection hopper (15) is completely offset from the column (12). The projection of the spiral plate in the vertical direction falls completely into the collection hopper (15).

8. A metal powder screening device according to claim 7, characterized in that, It includes a third collection box (6) and a fourth collection box (7), the third collection box (6) being located below the outlet of the guide pipe (133) and the fourth collection box (7) being located below the outlet of the collection hopper (15).

9. A metal powder screening device according to claim 5, characterized in that, It includes a frame structure, a hopper (1), and a first screening structure (8), a second screening structure (9), a feeding hopper (17), a discharging hopper (10), and a receiving hopper (11) installed inside the hopper (1); The bin (1) is installed on the frame mechanism, and the bin (1) is higher than the spiral sorting mechanism (3). The top of the bin (1) is provided with a feed inlet. The first end of the first screening structure (8) is higher than its second end, the first end of the second screening structure (9) is higher than its second end, the second end of the first screening structure (8) is higher than the first end of the second screening structure (9), the first end of the first screening structure (8) is located directly below the feed inlet, and the aperture of the second screening structure (9) is larger than the aperture of the first screening structure (8). The first end of the discharge hopper (10) is higher than its second end, and the first end of the discharge hopper (10) is located below the second end of the second screening structure (9), and the second end of the discharge hopper (10) extends out of the hopper body (1); The first end of the feeding hopper (17) is higher than its second end. The first end of the feeding hopper (17) is located below the first screening structure (8). The feeding hopper (17) is used to receive metal powder passing through the first screening structure (8). The second end of the feeding hopper (17) extends out of the hopper body (1). The receiving hopper (11) is arranged below the second screening structure (9) to receive metal powder passing through the second screening structure (9), and the outlet of the receiving hopper (11) is located above the top of the spiral feeder (14).

10. A metal powder screening device according to claim 9, characterized in that, It includes a first collection box (4) and a second collection box (5), which are placed on the frame mechanism. The first collection box (4) is located below the second end of the feed hopper (17), and the second collection box (5) is located below the second end of the discharge hopper (10).

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