Powder screening device

Abstract

The invention discloses a powder screening device. The powder screening device comprises a vacuum generator, a vortex separation hopper connected with the vacuum generator, a direct discharge screen arranged below the vortex separation hopper, a material receiving trolley arranged below the direct discharge screen and an unqualified hopper arranged on one side of the direct discharge screen. A powder suction pipeline communicated with a powder source is arranged on the upper side of the vortex separation hopper; the straight discharge screen comprises a vibrator and a screen mesh which is detachably arranged below the straight discharge screen; when the powder is screened, the vibrator drives the screen mesh to vibrate continuously, the powder does elliptical motion on the screen mesh, and qualified powder passes through the screen mesh under the action of vibration and then falls into the material receiving trolley; and unqualified powder enters the unqualified material hopper under the action of centrifugal force generated by the vibrator. According to the automatic screening device, powder can be in a suspended state under the action of ultrasonic waves, agglomerated powder can be scattered through the ultrasonic waves, in addition, the powder is made to do centrifugal motion under the action of the vibrator, and therefore unqualified powder is automatically discharged out of the direct discharge screen.

Description

Technical Field

[0001] The present invention relates to the field of powder metallurgy, and more particularly to a device for powder screening. Background Art

[0002] Metal powder is the main raw material used in powder metallurgy, which can be specifically divided into single metal powder, alloy powder, and some refractory compound powders with metallic properties, with a particle size less than 1 mm. It has a wide range of applications and plays an important role in industries such as aerospace, biomedicine, military, metallurgy, construction, automotive, electronics, jewelry, and molds. For example, it is widely used in the aerospace field to manufacture high-performance components and in the electronics industry to produce electronic components.

[0003] Another important application field of metal powder is metal additive manufacturing, and additive manufacturing has extremely strict requirements for the metal powder used. For example, it is required to meet the requirements of small powder particle size, uniform particle size range distribution, good fluidity, high loose bulk density, etc. However, the particle size range distribution of metal powder produced by current mainstream powder production technologies is usually relatively wide, resulting in quality problems in the printed parts. Therefore, it is necessary to screen the metal powder before printing to obtain metal powder that meets the particle size requirements. Existing powder screening equipment generates a large amount of dust during the screening process, which affects the working environment and the health of operators. In addition, some powders with smaller particle sizes are prone to agglomeration during the screening process, resulting in ineffective separation. Moreover, the screening equipment cannot automatically discharge unqualified powder, resulting in the need for staff to manually clean out unqualified powder after the equipment has been used for a period of time, resulting in low screening efficiency. Summary of the Invention

[0004] Based on this, it is necessary to provide a powder screening device for the problems of a large amount of dust generated during screening by existing powder screening equipment, easy agglomeration of powders with small particle sizes, and ineffective discharge of unqualified powder by the screening equipment. This automatic screening device can make the powder in a suspended state under the action of ultrasonic waves, and can disperse the agglomerated powder through ultrasonic waves. In addition, under the action of a vibrator, the powder makes a centrifugal motion, so as to automatically discharge the unqualified powder into a straight-through sieve.

[0005] A powder screening device, which includes a vacuum generator, a vortex separation hopper connected to the vacuum generator, a direct discharge sieve arranged below the vortex separation hopper, a receiving trolley arranged below the direct discharge sieve, and a non-conforming material hopper arranged on one side of the direct discharge sieve; an absorbing powder pipeline communicating with a powder source is arranged on the upper side of the vortex separation hopper; the direct discharge sieve includes a vibrator and a sieve mesh detachably arranged below the direct discharge sieve; when screening the powder, the vibrator drives the sieve mesh to vibrate continuously, and makes the powder move in an elliptical motion on the sieve mesh. The qualified powder falls into the receiving trolley after passing through the sieve mesh under the action of vibration; the unqualified powder enters the non-conforming material hopper under the action of the centrifugal force generated by the vibrator.

[0006] Further, the direct discharge sieve further includes an ultrasonic generator, and the ultrasonic waves generated by the ultrasonic generator can keep the powder in the direct discharge sieve in a suspended state.

[0007] Further, a non-conforming powder discharge pipe is arranged on the side wall of the direct discharge sieve near the sieve mesh, and the non-conforming powder discharge pipe is tangent to the side wall of the direct discharge sieve.

[0008] Further, a feed inlet is arranged above the direct discharge sieve, and the feed inlet is connected to the lower end of the vortex separation hopper.

[0009] Further, an aggregate hopper is also arranged below the sieve mesh of the direct discharge sieve, and the discharge port at the lower end of the aggregate hopper is located above the receiving trolley.

[0010] Further, the aggregate hopper is in a funnel shape.

[0011] Further, the powder screening device further includes an integrated cabinet. The direct discharge sieve is integrated in the integrated cabinet, and the vacuum generator and the vortex separation hopper are respectively arranged on the top of the integrated cabinet.

[0012] Further, the receiving trolley is movably arranged on the lower side of the integrated cabinet, and the receiving trolley is located directly below the direct discharge sieve.

[0013] Further, universal wheels are arranged on the lower side of the integrated cabinet.

[0014] Further, a controller is also arranged on one side of the integrated cabinet, and the start and stop of the vacuum generator and the direct discharge sieve are controlled through the controller.

[0015] A powder screening device provided by the present invention, under the action of a vibrator, the powder will perform an elliptical motion on a straight-through screen. For powders with a particle size smaller than the screen aperture, they will pass through the screen under the action of vibration and gravity and be screened into a receiving trolley for use. For powders with a particle size larger than the screen aperture, that is, unqualified powders, the greater the centrifugal force they receive, so they will be discharged from the unqualified powder discharge pipe on the side wall of the straight-through screen under the action of centrifugal force; and, in the present invention, the screen is detachably arranged below the straight-through screen, and different-aperture screens can be replaced according to the requirements of metal powders for screening. In addition, in the present invention, an ultrasonic generator is also arranged on the straight-through screen. The ultrasonic waves generated by the ultrasonic generator can keep the small-particle-size powders in the straight-through screen in a suspended state, effectively suppressing powder clogging of the screen and reducing the dust amount; the ultrasonic waves can also disperse the agglomerated powders, so as to effectively separate all qualified powders. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of a powder screening device of the present invention;

[0017] Figure 2 It is a top view of the straight-through screen of the powder screening device of the present invention.

[0018] Reference Signs

[0019] 1 vacuum generator, 2 vortex separation hopper, 3 straight-through screen, 4 receiving trolley, 5 unqualified hopper, 6 integrated cabinet, 31 vibrator, 32 screen, 33 ultrasonic generator, 34 unqualified powder discharge pipe, 35 feed inlet, 36 aggregate hopper, 61 universal wheel, 62 controller. Detailed Embodiments

[0020] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0021] It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] A powder screening device provided by the present invention, the powder screening device includes a vacuum generator, a vortex separation hopper connected to the vacuum generator, a direct discharge sieve disposed below the vortex separation hopper, a receiving trolley disposed below the direct discharge sieve, and a non-conforming material hopper disposed on one side of the direct discharge sieve; an absorbing powder pipeline communicating with a powder source is disposed on the upper side of the vortex separation hopper; the direct discharge sieve includes a vibrator and a sieve mesh detachably disposed below the direct discharge sieve; when screening the powder, the vibrator drives the sieve mesh to vibrate continuously, and makes the powder perform an elliptical motion on the sieve mesh, and the qualified powder passes through the sieve mesh under the action of vibration and then falls into the receiving trolley; the non-conforming powder enters the non-conforming material hopper under the action of the centrifugal force generated by the vibrator.

[0024] A powder screening device provided by the present invention, under the action of the vibrator, the powder will perform an elliptical motion on the direct discharge sieve. For the powder with a particle size smaller than the aperture of the sieve mesh, it will pass through the sieve mesh under the action of vibration and gravity and be screened into the receiving trolley for use. For the powder with a particle size larger than the aperture of the sieve mesh, that is, the non-conforming powder, the greater the centrifugal force it receives, so it will be discharged from the non-conforming powder discharge pipe on the side wall of the direct discharge sieve under the action of the centrifugal force; and, in the present invention, the sieve mesh is detachably disposed below the direct discharge sieve, and different aperture sieve meshes can be replaced according to the requirements of the metal powder for screening..

[0025] The following describes a powder screening device in conjunction with specific embodiments to further understand the inventive concept of the powder screening device.

[0026] In one embodiment, as Figure 1-2As shown in the figure, a powder screening device includes a vacuum generator 1 and a vortex separation hopper arranged on the top of an integrated cabinet 6. The vortex separation hopper 2 is connected to the vacuum generator 1 through a pipeline. A powder suction pipeline 21 communicating with a powder source is arranged on the upper side of the vortex separation hopper 2. A direct discharge sieve 3 is arranged below the vortex separation hopper 2. The direct discharge sieve 3 is arranged inside the integrated cabinet 6. The upper side of the direct discharge sieve 3 is communicated with the lower side of the vortex separation hopper 2. A receiving trolley 4 is arranged below the direct discharge sieve 3. And an unqualified material hopper 5 is also arranged on one side of the direct discharge sieve. The unqualified material hopper 5 is arranged inside the integrated cabinet, and the unqualified material hopper 5 is communicated with the powder source through a pipeline, so as to convey the unqualified powder back to the powder source. The receiving trolley 4 is movably arranged below the integrated cabinet, so as to be moved to a target station after receiving materials. The direct discharge sieve 2 further includes a vibrator 31 and a sieve mesh 32. Two vibrators 31 are arranged, respectively located on opposite sides of the direct discharge sieve 2. The sieve mesh 32 is detachably arranged at the bottom of the direct discharge sieve 3, so as to replace sieve meshes with different pore diameters according to the requirements of the powder particle size range. An unqualified powder discharge pipe 34 is further arranged on the side wall of the direct discharge sieve 3 near the sieve mesh 32. The unqualified powder discharge pipe 34 is tangent to the side wall of the direct discharge sieve 3, so that the unqualified powder moving to the unqualified powder discharge pipe 34 is discharged under the action of centrifugal force..

[0027] When screening the powder, first start the vacuum generator 1. The negative pressure generated by the vacuum generator 1 sucks the powder at the powder source into the vortex separation hopper 2. The powder entering the vortex separation hopper 2 enters the direct discharge sieve 3 under the action of gravity. Start the vibrator 31 to drive the sieve mesh 32 to vibrate continuously. The powder moves rapidly back and forth on the sieve mesh 32, and the generated vibration force continuously strips and disperses the material, so that the qualified powder quickly passes through the mesh and enters the receiving trolley 4. At the same time, under the action of vibration, the powder makes a clockwise elliptical motion on the sieve mesh 32, and its motion trajectory is as shown by the arrow direction in the attached Figure 2 figure. Making an elliptical motion will generate centrifugal force. The larger the particle size of the powder, the greater its mass, so the centrifugal force it receives is also greater. That is, the unqualified powder with a large particle size will move to the inner side wall of the direct discharge sieve 3 under the action of centrifugal force and be discharged from the unqualified powder discharge pipe 34.

[0028] In another embodiment, as Figure 2 shown, the direct discharge sieve 3 further includes an ultrasonic generator 33. The ultrasonic waves generated by the ultrasonic generator 33 keep the powder in the direct discharge sieve 3 in a suspended state, thus effectively inhibiting powder from clogging the sieve mesh and reducing the dust amount. The ultrasonic waves can also disperse the agglomerated powder, so as to effectively separate all qualified powders.

[0029] In another embodiment, as Figure 2As shown, a feed inlet 35 is provided above the straight-through sieve 3, and the feed inlet 35 is connected to the lower end of the vortex separation hopper 2. As Figure 1 shown, after the lower end of the vortex separation hopper 2 extends into the integrated cabinet 6, it is connected to the feed inlet 35.

[0030] In another embodiment, as Figure 1 shown, a collecting hopper 36 is further provided below the screen 32 of the straight-through sieve 3. The discharge port at the lower end of the collecting hopper 36 is located above the receiving trolley 4, and the collecting hopper 36 is detachably connected to the straight-through sieve. Preferably, the collecting hopper 36 is funnel-shaped, so as to guide the powder passing through the screen 32 into the collecting trolley 4. In this embodiment, the collecting hopper 36 is used to prevent the powder passing through the screen 32 from floating and failing to effectively fall into the receiving trolley 4.

[0031] In another embodiment, universal wheels 61 are further provided on the lower side of the integrated cabinet to facilitate the movement of the powder screening device.

[0032] In another embodiment, a controller 62 is further provided on one side of the integrated cabinet, and the start and stop of the vacuum generator 1 and the straight-through sieve 3 are controlled by the controller 62.

[0033] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0034] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A powder screening device, characterized in that, The powder screening device includes a vacuum generator (1), a vortex separation hopper (2) connected to the vacuum generator (1), a straight-through screen (3) disposed below the vortex separation hopper (2), a receiving trolley (4) disposed below the straight-through screen (3), and a reject hopper (5) disposed on one side of the straight-through screen (3); an absorbent powder pipeline (21) communicating with a powder source is disposed on the upper side of the vortex separation hopper (2); the straight-through screen (3) includes a vibrator (31) and a screen mesh (32) detachably disposed below the straight-through screen (3); when screening the powder, the vibrator (31) drives the screen mesh (32) to continuously vibrate, and makes the powder perform an elliptical motion on the screen mesh (32), and the qualified powder passes through the screen mesh under the action of vibration and falls into the receiving trolley (4); the unqualified powder enters the reject hopper (5) under the action of the centrifugal force generated by the vibrator (31).

2. The powder screening device according to claim 1, characterized in that, The straight-through screen (3) further includes an ultrasonic generator (33), and the ultrasonic waves generated by the ultrasonic generator (33) can keep the powder in the straight-through screen (3) in a suspended state.

3. A powder screening device according to claim 1, characterized in that, An unqualified powder discharge pipe (34) is disposed on the side wall of the straight-through screen (3) near the screen mesh (32), and the unqualified powder discharge pipe (34) is tangent to the side wall of the straight-through screen (3).

4. A powder screening device according to claim 1, wherein A feed inlet (35) is disposed above the straight-through screen (3), and the feed inlet (35) is connected to the lower end of the vortex separation hopper (2).

5. A powder screening device according to claim 4, characterized in that, An aggregate hopper (36) is further disposed below the screen mesh (32) of the straight-through screen (3), and the discharge port at the lower end of the aggregate hopper (36) is located above the receiving trolley (4).

6. A powder screening device according to claim 5, characterized in that, The aggregate hopper (36) is in a funnel shape.

7. A powder screening device according to claim 4, characterized in that, The powder screening device further includes an integrated cabinet (6), the straight-through screen (3) is integrated in the integrated cabinet (6), and the vacuum generator (1) and the vortex separation hopper (2) are respectively disposed on the top of the integrated cabinet (6).

8. A powder screening device according to claim 7, wherein the receiving trolley (4) is movably disposed below the integrated cabinet (6), and the receiving trolley (4) is located directly below the straight-through screen (3).

9. A powder screening device according to claim 8, wherein, Universal wheels (61) are disposed on the lower side of the integrated cabinet.

10. A powder screening device according to claim 8, characterized in that, A controller (62) is further disposed on one side of the integrated cabinet, and the start and stop of the vacuum generator (1) and the straight-through screen (3) are controlled by the controller.

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