Ultrasonic metal powder screen apparatus and method of using same

Abstract

The application relates to an ultrasonic metal powder screen device and a use method thereof. The ultrasonic metal powder screen device comprises a boss outer frame, a screen and an ultrasonic generator. The boss outer frame comprises a base frame and a top frame. The top frame is connected with the base frame through a plurality of supporting rods. The top frame protrudes from the base frame. The screen covers the top frame and an inclined screen surface between the top frame and the base frame. The ultrasonic generator is in contact with the supporting rods. The ultrasonic generator transmits ultrasonic waves along the supporting rods to the top frame, so that the screen covering the top frame vibrates. The ultrasonic metal powder screen device can use a lower mesh screen to achieve the screening effect of a higher mesh screen, thereby avoiding the problem that the service life of the ultrasonic metal powder screen device is short due to the excessively high mesh of the screen and the excessively small wire diameter of the screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal powder screening equipment, and particularly relates to an ultrasonic metal powder screen device and a use method thereof. BACKGROUND

[0002] Metal 3D printing technology is an advanced manufacturing technology for manufacturing three-dimensional objects by layer-by-layer accumulation of metal materials. Among them, the flowability and uniformity of metal powder are key properties of powder materials used in 3D printing technology. In order to ensure the purity of metal powder, technicians often need to perform a screening step to separate large particle size metal powder in the powder. The existing ultrasonic metal powder screen device for 3D printing is roughly divided into two types:

[0003] The first type is a high-mesh flat screen. However, the wire diameter of a high-mesh (greater than 500 mesh) screen is generally small (less than 25 pm), which results in a short wire diameter service life, and the screen needs to be frequently replaced, thereby increasing downtime and cost in the production process, which is not conducive to continuous production.

[0004] The second type is a low-mesh flat screen. However, the filtering capacity of a low-mesh screen is not sufficient enough, and it cannot effectively separate large particle size metal powder in the metal powder, thereby resulting in low purity of the screened metal powder. The low-purity metal powder will affect the quality and performance of the subsequent 3D printing product. SUMMARY

[0005] The present application provides an ultrasonic metal powder screen device and a use method thereof to solve the technical problem that the existing ultrasonic metal powder screen device cannot simultaneously meet the requirements of sufficient filtering and long service life.

[0006] In a first aspect, the present application provides an ultrasonic metal powder screen device, which comprises:

[0007] a boss outer frame, a screen, and an ultrasonic generator, the boss outer frame comprising a base frame and a top frame, the top frame being connected to the base frame through a plurality of support rods, and the top frame being protruded from the base frame;

[0008] the screen being covered on the top frame and an inclined screen surface between the top frame and the base frame;

[0009] the ultrasonic generator being in contact with the support rods, the ultrasonic generator transmitting the generated ultrasonic waves along the support rods to the top frame, so that the screen covered on the top frame vibrates.

[0010] Further, in some preferred embodiments, the base frame is in a ring structure, the top frame is in a ring structure, and the radius of the top frame is smaller than the radius of the base frame.

[0011] Further, in some preferred embodiments, the base frame is a ring structure, the top frame is a conical structure, and the radius of the bottom surface of the top frame is smaller than the radius of the base frame.

[0012] Further, in some preferred embodiments, the screen is a stainless steel mesh structure integrally formed; the screen covers the outer frame of the boss, and the edges of the screen are bonded to the base frame in the outer frame of the boss.

[0013] Further, in some preferred embodiments, the screen includes a top frame screen and an inclined screen, the top frame screen is bonded to the top frame, and one end of the inclined screen is bonded to the top frame and the other end is bonded to the base frame.

[0014] Further, in some preferred embodiments, the height difference between the plane where the top frame is located and the plane where the base frame is located is 2-10 mm.

[0015] Further, in some preferred embodiments, the edges of the base frame are provided with at least one outlet for discharging large pieces of material or debris.

[0016] In a second aspect, the application provides a use method of an ultrasonic metal powder screen device, which is applied to the ultrasonic metal powder screen device described above, and the use method of the ultrasonic metal powder screen device includes:

[0017] Controlling the to-be-screened metal powder to fall from above the ultrasonic metal powder screen device to the screen of the top frame at a preset speed;

[0018] Controlling the ultrasonic generator to work to drive the top frame to vibrate through the support rod;

[0019] Collecting the metal powder screened by the ultrasonic metal powder screen device.

[0020] Further, in some preferred embodiments, the control of the ultrasonic generator includes:

[0021] Obtaining the target particle size of the to-be-screened metal powder and the mesh number of the screen;

[0022] According to the mesh number of the screen, calculating the pore size of the screen hole;

[0023] Judging whether the target particle size matches the pore size of the screen hole;

[0024] If the target particle size does not match the pore size of the screen hole, controlling the ultrasonic generator to start working;

[0025] If the target particle size matches the aperture size of the screen hole, the ultrasonic generator is controlled not to start working.

[0026] Further, in a preferred implementation of some embodiments, the control of the ultrasonic generator to work further includes:

[0027] When the target particle size does not match the aperture size of the screen hole, the difference between the aperture size of the screen hole and the target particle size is calculated;

[0028] When the difference is in a first preset range, the ultrasonic generator is controlled to work at a first frequency;

[0029] When the difference is in a second preset range, the ultrasonic generator is controlled to work at a second frequency; the second preset range is greater than the first preset range, and the second frequency is greater than the first frequency.

[0030] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0031] On the one hand, the ultrasonic metal powder screen device provided by the embodiments of the present application is provided with an ultrasonic generator, which can transmit the generated ultrasonic waves along the support rod to the top frame to vibrate the screen covered on the top frame, and further drive the metal powder to be screened falling on the ultrasonic metal powder screen device to jump, so as to accelerate the falling and screening speed of the metal powder meeting the requirements, and improve the screening efficiency of the ultrasonic metal powder screen device.

[0032] On the other hand, the top frame of the ultrasonic metal powder screen device protrudes from the base frame, that is, the plane where the top frame is located is higher than the plane where the base frame is located, and a height difference is formed between the top frame and the base frame. When the metal powder to be screened in the top frame moves to the inclined screen surface between the top frame and the base frame under the action of the ultrasonic generator, due to the existence of the height difference, the metal powder to be screened on the inclined screen surface will slide downward (specifically from the top frame to the base frame), so that the metal powder to be screened has a sliding speed, and the speed of the metal powder to be screened falling and screening in the inclined screen surface is improved, thereby further improving the screening efficiency of the ultrasonic metal powder screen device.

[0033] Obviously, the ultrasonic metal powder screen device can use a lower mesh screen to achieve the screening effect of a higher mesh screen (for example, the ultrasonic metal powder screen device with a mesh of 500 can be equivalent to replace a plane screen with a mesh of 800), so as to avoid the problem of low service life of the ultrasonic metal powder screen device caused by too high mesh of the screen and too small wire diameter of the screen. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the field, under the premise of no creative labor, other drawings can also be obtained according to these drawings.

[0036] One or more embodiments are illustrated by way of example in the drawings that are not intended to be limiting of the application, and the same or similar reference numerals designate similar elements throughout the several views of the drawings, and wherein:

[0037] Figure 1 A structural diagram of an ultrasonic metal powder screen device provided for an embodiment of the present application Figure 1 ;

[0038] Figure 2 A structural diagram of an ultrasonic metal powder screen device provided for an embodiment of the present application Figure 2 ;

[0039] Figure 3 A flowchart of a method for using an ultrasonic metal powder screen device provided for an embodiment of the present application

[0040] Figure 4 A flowchart for controlling an ultrasonic generator to work in the present application Figure 3

[0041] A flowchart for the working process when the target particle size does not match the pore size of the screen hole in the present application Figure 5 Figure 4

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 100, ultrasonic metal powder screen device; 10, boss outer frame; 11, base frame; 12, top frame; 30, support rod; 40, screen; 41, top frame screen; 42, inclined screen. DETAILED DESCRIPTION

[0044] ​​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0045] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of the specific examples are described in the following. Of course, they are only examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0046] For the purpose of description, spatial relative terms can be used in the text to describe the relative position relationship or movement of one element or feature with respect to another element or feature as shown in the drawings, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is flipped over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both up and down positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0047] The ultrasonic metal powder screen device 100 provided by the embodiments of the present application is used for screening large particle size metals or impurities in metal powder. The metal powder can be titanium alloy metal powder, aluminum alloy metal powder, nickel-based alloy metal powder, etc., which is not limited by the present application.

[0048] As Figure 1 And Figure 2As shown, the ultrasonic metal powder screen device 100 comprises a convex outer frame 10, a screen 40 and an ultrasonic generator (not shown). In order to ensure the stability and reliability of the ultrasonic metal powder device during operation, the convex outer frame 10 comprises a base frame 11 and a top frame 12, and the top frame 12 is connected to the base frame 11 by a plurality of support rods 30.

[0049] In this embodiment, the base frame 11, the top frame 12 and the support rods 30 are all stainless steel pipes, one end of the support rod 30 is welded to the top frame 12, the other end is welded to the base frame 11, and the plurality of support rods 30 are evenly distributed in the circumferential direction of the top frame 12.

[0050] In addition, in order to realize the screening of metal powder and ensure the purity of metal powder and the quality of subsequent product manufacturing, the screen 40 is covered on the top frame 12 and the inclined screen surface between the top frame 12 and the base frame 11.

[0051] As can be understood, when the technician spreads the metal powder to be screened onto the ultrasonic metal powder screen device 100, the fine metal particles that meet the requirements in the metal powder will pass through the screen holes of the corresponding screen 40 and fall below; while the metal particles or impurities with large particle size cannot pass through the corresponding screen 40, but remain on the screen 40.

[0052] It should be noted that since the top frame 12 and the base frame 11 are inclined, after the screen 40 screens the metal powder to be screened, the remaining large materials or impurities can roll down the inclined screen surface between the top frame 12 and the base frame 11 to the bottom of the base frame 11.

[0053] Therefore, the remaining of large materials or impurities can be avoided, which can prevent the screen 40 from being blocked, thereby ensuring the normal use of the ultrasonic metal powder screen device 100 and not affecting the subsequent screening of metal powder.

[0054] In addition, as shown in Figure 1 and Figure 2 In order to improve the screening efficiency of the ultrasonic metal powder screen device 100, the ultrasonic generator is in contact with the support rod 30, and the ultrasonic generator transmits the generated ultrasonic waves along the support rod 30 to the top frame 12, so that the screen 40 covered on the top frame 12 vibrates.

[0055] As can be understood, when the ultrasonic metal powder screen device 100 is used, the ultrasonic waves generated by the ultrasonic generator can be transmitted along the support rod 30 to the top frame 12, so that the screen 40 covered on the top frame 12 vibrates, thereby driving the metal powder to be screened that falls on the ultrasonic metal powder screen 40 device 100 to jump, thereby speeding up the falling and screening speed of the metal powder that meets the requirements, and improving the screening efficiency of the ultrasonic metal powder screen device 100.

[0056] Of course, in other embodiments, the ultrasonic generator can also be arranged inside the top frame 12. In other words, the ultrasonic generator emits ultrasonic waves that can directly act on the top frame 12 to drive the screen 40 covered on the top frame 12 to vibrate, which is not limited in the present application.

[0057] It should be noted that the skilled person can adjust the vibration frequency and amplitude of the ultrasonic generator according to the actual situation to control the jumping frequency and height of the metal powder to be screened on the screen 40, so as to control the screening accuracy (i.e. screening sufficiency) of the ultrasonic metal powder screen device 100, and adapt to different types and particle sizes of metal powder.

[0058] In the present embodiment, as shown in Figure 2 The top frame 12 protrudes from the base frame 11. In other words, the plane where the top frame 12 is located is higher than the plane where the base frame 11 is located, that is, a height difference is formed between the top frame 12 and the base frame 11.

[0059] It can be understood that when the metal powder to be screened in the top frame 12 moves to the inclined screen surface between the top frame 12 and the base frame 11 under the action of the ultrasonic generator, due to the existence of the height difference, the metal powder to be screened on the inclined screen surface will slide downward (specifically from the top frame 12 to the base frame 11) to make the metal powder to be screened have a sliding speed, thereby improving the falling screening speed of the metal powder to be screened on the inclined screen surface, and further improving the screening efficiency of the ultrasonic metal powder screen device 100.

[0060] It should be noted that the sliding speed of the metal powder to be screened is determined by the size of the height difference, and the greater the height difference, the faster the sliding speed of the metal powder to be screened.

[0061] Obviously, compared with the existing metal powder screen device, the ultrasonic metal powder screen device 100 can use a lower mesh screen 40 to achieve the screening effect of a higher mesh screen 40 (for example, the ultrasonic metal powder screen device 100 with a mesh of 500 can be equivalent to replace a plane screen with a mesh of 800), so as to avoid the problem of low service life of the ultrasonic metal powder screen device 100 caused by too high mesh of the screen 40 and too small wire diameter of the screen 40.

[0062] In order for those skilled in the art to better understand the technical scheme of the present application, the following will be combined with the accompanying Figures 1 to 5 The technical scheme of the present application is clearly and completely described.

[0063] Further, as a specific embodiment in some embodiments of the present application, as shown in Figure 1 and Figure 2As shown, the base frame 11 is annular structure, the top frame 12 is annular structure, and the radius of the top frame 12 is smaller than the radius of the base frame 11. In detail, the base frame 11 is a circular annular stainless steel pipe, the top frame 12 is a circular annular stainless steel pipe, and the circular annular top frame 12 is connected with the circular annular base frame 11 through a plurality of support rods 30 to form the circular truncated cone-shaped convex outer frame 10.

[0064] It should be noted that, due to the radius of the top frame 12 is smaller than the radius of the base frame 11, the screen 40 covering between the top frame 12 and the base frame 11 will have an inward inclination angle, thereby forming an inclined screen surface.

[0065] When the metal powder to be screened in the top frame 12 moves to the inclined screen surface between the top frame 12 and the base frame 11 under the action of the ultrasonic generator, the metal powder to be screened on the inclined screen surface will slide downward (specifically from the top frame 12 to the base frame 11). In this way, not only the speed of the metal powder to be screened falling and screening on the inclined screen surface can be improved, but also the large metal particles and impurities after screening can be prevented from blocking the screen 40.

[0066] In another optional embodiment, the base frame 11 is annular structure, the top frame 12 is conical structure, and the radius of the bottom surface of the top frame 12 is smaller than the radius of the base frame 11. The circular conical top frame 12 is connected with the circular annular base frame 11 through a plurality of support members to form the circular conical convex outer frame 10.

[0067] It should be noted that the taper of the conical structure top frame 12 is determined according to the requirement that the large particle size particles or impurities can roll along the inclined screen surface, and the required metal particles can smoothly pass through. The present application does not limit this, and those skilled in the art can select according to the actual situation.

[0068] Further, as a specific implementation manner of some embodiments of the present application, in order to facilitate the installation of the screen 40, the screen 40 is a stainless steel mesh structure integrally formed. It should be noted that stainless steel has corrosion resistance and high temperature resistance, which can resist corrosion and oxidation of metal powder, and has high strength and wear resistance, and can withstand long-term use and repeated screening operation.

[0069] Of course, in other embodiments, the screen 40 can also be selected from other suitable materials, and the present application does not limit this, and those skilled in the art can select according to the actual situation.

[0070] The screen 40 is covered on the convex outer frame 10, and the edge of the screen 40 is bonded on the base frame 11 in the convex outer frame 10. Specifically, the technician covers the whole screen 40 on the convex outer frame 10 (i.e. on the top frame 12 and the inclined screen surface between the top frame 12 and the base frame 11), and bonds the edge of the screen 40 on the base frame 11 by an adhesive, such as glue, hot melt adhesive, etc. Wherein, after the screen 40 is bonded, the screen 40 is always in a tension state.

[0071] Therefore, the technician can more conveniently and quickly realize the assembly of the ultrasonic metal powder screen device 100, and improve the manufacturing efficiency of the ultrasonic metal powder screen device 100.

[0072] In another optional embodiment, the screen 40 includes a top frame screen 41 and an inclined screen 42, the top frame screen 41 is bonded on the top frame 12, and one end of the inclined screen 42 is bonded on the top frame 12 and the other end is bonded on the base frame 11. Wherein, the top frame screen 41 and the inclined screen 42 are both in a tension state after being bonded.

[0073] It should be noted that, by using the above technical solution, when the top frame screen 41 and the inclined screen 42 are damaged, the technician only needs to replace the corresponding screen 40, and does not need to replace the whole screen 40, so as to save resources and avoid waste.

[0074] Further, as a specific implementation manner in some embodiments of the present application, the height difference between the plane where the top frame 12 is located and the plane where the base frame 11 is located ranges from 2mm to 10mm.

[0075] Therefore, not only can the problem of the screen 40 being blocked caused by the fact that the height difference between the plane where the top frame 12 is located and the plane where the base frame 11 is located is too small, so that the large particle size particles or impurities separated on the inclined screen surface cannot roll along the inclined screen surface, but also can prevent the projection of the screen 40 hole in the inclined screen surface on the vertical plane from being reduced due to the fact that the height difference between the plane where the top frame 12 is located and the plane where the base frame 11 is located is too large, so that the metal particles meeting the requirements are difficult to pass through the screen 40 smoothly.

[0076] Preferably, in the present embodiment, the height difference between the plane where the top frame 12 is located and the plane where the base frame 11 is located is 10mm. Of course, in other embodiments, the height difference between the plane where the top frame 12 is located and the plane where the base frame 11 is located can also be other values, as long as the large particle size particles or impurities can roll along the inclined screen surface, and the material meeting the requirements can pass through the screen 40 smoothly, which is not limited in the present application, and the person skilled in the art can select according to the actual situation of the filtered material.

[0077] Further, as a specific implementation manner of some embodiments of the utility model, the bottom of the base frame 11 is provided with at least one outlet (not shown in the figure) for discharging large materials or sundries. Thus, the large materials or sundries can be discharged conveniently and quickly, avoiding blockage and affecting the screening effect.

[0078] Specifically, one or more outlets are arranged at the outer edge of the bottom of the base frame 11, which can be in the form of openable or closable, so as to be operated and controlled by the technician according to the needs. When it is necessary to discharge large materials or sundries, the outlet can be opened; while in the normal screening operation, only the closing of the outlet is needed to ensure the accuracy and efficiency of the screening.

[0079] It should be noted that the number and position of the notches can be selected according to the actual needs, which are not limited in the present application.

[0080] Based on the above-mentioned ultrasonic metal powder screen device 100, the present application further provides a use method of the ultrasonic metal powder screen device 100, wherein, as shown in the figure, the use method of the ultrasonic metal powder screen device 100 comprises: Figures 3 to 5

[0081] S100, controlling the to-be-screened powder to fall from above the ultrasonic metal powder screen device 100 to the screen 40 of the top frame 12 at a preset speed, so as to ensure the uniform distribution of the to-be-screened metal powder in the screening process, thereby improving the screening efficiency and accuracy of the ultrasonic metal powder screen device 100.

[0082] Specifically, the technician can control the falling speed of the powder through the powder feeding system (not shown in the figure), which is usually composed of a container and a control device. The metal powder is placed in the container and gradually released onto the screen 40 at a preset speed through the adjustment of the control device. At the same time, the technician can adjust the size, opening and closing frequency of the discharge port and the distance between the discharge port and the screen 40 to realize the falling speed of the to-be-screened metal powder.

[0083] It should be noted that the above technical solution one can avoid the to-be-screened metal powder falling too fast to cause blockage, and the second can avoid the to-be-screened metal powder falling too slowly to reduce the working efficiency of the ultrasonic metal powder screen device 100.

[0084] It should be further noted that the falling speed of different metal powders is different, which is not limited in the present application, and the skilled person in the art can select according to the actual situation.

[0085] ​S200, control the ultrasonic generator to work, so that the generated ultrasonic waves drive the top frame 12 to vibrate through the support rod 30. Specifically, the ultrasonic waves generated by the ultrasonic generator can be transmitted to the top frame 12 along the support rod 30, so that the screen 40 covered on the top frame 12 vibrates, and then drives the metal powder to be screened that falls on the ultrasonic metal powder screen device 100 to jump, thereby speeding up the falling and screening speed of the metal powder meeting the requirements, and improving the screening efficiency of the ultrasonic metal powder screen device 100.

[0086] S300, collect the metal powder screened by the ultrasonic metal powder screen device 100 for subsequent process. Specifically, the collection piece (not shown in the figure) is usually a container or a box with enough capacity to accommodate the screened metal powder.

[0087] It can be understood that when the metal powder to be screened is screened through the screen 40, the screened metal powder will fall into the collection piece through the pores of the screen 40. When the material in the collection piece accumulates to a certain extent, the user can take down the collection piece, empty the metal powder therein, and reinstall it on the ultrasonic metal powder screen device 100. Therefore, not only can the screened metal powder be more conveniently collected and processed, but also the scattering and waste of metal powder can be prevented.

[0088] In summary, compared with the prior art, the use method of the ultrasonic metal powder screen device 100 has at least the following beneficial effects: the use method of the ultrasonic metal powder screen device 100 adopts the above-mentioned ultrasonic metal powder screen device 100, the ultrasonic metal powder screen device 100 is provided with an ultrasonic generator, the ultrasonic generator can transmit the generated ultrasonic waves to the top frame 12 along the support rod 30, so that the screen 40 covered on the top frame 12 vibrates, and then drives the metal powder to be screened that falls on the ultrasonic metal powder screen device 100 to jump, thereby speeding up the falling and screening speed of the metal powder meeting the requirements, and improving the screening efficiency of the ultrasonic metal powder screen device 100.

[0089] Obviously, the ultrasonic metal powder screen device 100 can use a lower mesh screen 40 to achieve the screening effect of a higher mesh screen 40, so as to avoid the problem of low service life of the ultrasonic metal powder screen device 100 caused by too high mesh screen 40 and too small wire diameter of the screen 40.

[0090] Further, as a specific implementation manner of some embodiments of the present application, Figure 4 As shown, the control of the ultrasonic generator includes:

[0091] S210, obtaining the target particle size of the metal powder to be screened and the mesh number of the screen 40.

[0092] S220, according to the mesh number of the screen 40, the aperture of the screen hole of the screen 40 is calculated.

[0093] S230, it is judged whether the target particle size matches the aperture of the screen hole.

[0094] S240, if the target particle size does not match the aperture of the screen hole, the ultrasonic generator is controlled to start working.

[0095] S250, if the target particle size matches the aperture of the screen hole, the ultrasonic generator is controlled not to start working.

[0096] In detail, before starting to screen the metal powder, the technician first determines the target particle size of the required metal powder, and determines the mesh number (i.e. the number of screen holes) of the screen 40 used. Then, according to the mesh number of the screen 40 used, the technician can determine the aperture of the screen hole. Then, the technician compares the target particle size with the aperture of the screen hole of the screen 40 to be screened.

[0097] If the target particle size matches the aperture of the screen hole, the aperture size of the screen 40 is suitable for the required particle size range, and the ultrasonic generator does not need to be started.

[0098] If the target particle size does not match the aperture of the screen hole, the aperture size of the screen 40 is not suitable for the required particle size range. In this case, the ultrasonic generator needs to be started to assist the screening process. Specifically, the vibration of the ultrasonic wave can help to separate the particles that do not meet the requirements from the screen 40, improving the screening effect.

[0099] It should be noted that if the target particle size matches the aperture of the screen hole, it means that the aperture size of the screen 40 is suitable for the required particle size range, and the ultrasonic generator does not need to be used. In this case, the ultrasonic generator can be temporarily stopped to save energy and reduce the use of equipment.

[0100] Therefore, through the above steps, the technician can determine whether the ultrasonic generator needs to be started according to the target particle size and the characteristics of the screen 40, so that the technician can flexibly control the working of the ultrasonic generator according to different screening requirements and powder characteristics, thereby obtaining more accurate and efficient screening effect.

[0101] Further, as a specific implementation manner of some embodiments of the present application, as shown in Figure 5 the control of the ultrasonic generator to work further comprises:

[0102] S241, when the target particle size does not match the aperture of the screen hole, the difference between the aperture of the screen hole and the target particle size is calculated. It should be noted that the above difference represents the size difference between the target particle size and the screen hole aperture.

[0103] S242, when the difference is within a first preset range, controlling the ultrasonic generator to operate at a first frequency. Specifically, the technician pre-sets a first preset range, which defines the maximum difference between the target particle size and the mesh aperture.

[0104] It can be understood that if the difference between the mesh aperture and the target particle size calculated in S241 is within the first preset range, i.e. within the acceptable range, the ultrasonic generator is controlled to operate at a first preset frequency.

[0105] S243, when the difference is within a second preset range, controlling the ultrasonic generator to operate at a second frequency. It should be noted that the second preset range is greater than the first preset range, and the second frequency is greater than the first frequency.

[0106] Specifically, the technician pre-sets a second preset range, which defines a larger difference between the target particle size and the mesh aperture. If the difference is within the second preset range, i.e. beyond the first preset range but still within the acceptable range, the ultrasonic generator is controlled to operate at a second preset frequency, which is higher than the first preset frequency.

[0107] It should be noted that the technician can dynamically adjust the operating frequency of the ultrasonic generator according to the difference between the target particle size and the mesh aperture. If the difference is within the first preset range, it means that the difference between the target particle size and the mesh aperture is small, and a lower frequency can be used for operation. If the difference is within the second preset range, it means that the difference between the target particle size and the mesh aperture is large, and a higher frequency is needed for operation.

[0108] Thus, the operation of the ultrasonic generator can be more finely controlled to adapt to the screening requirements of different particle size ranges, thereby improving the accuracy and efficiency of screening and ensuring that the screened metal powder meets the expected target particle size requirements.

[0109] For example, the target particle size is 100 μm, and the mesh 40 aperture used is 120 μm. The first preset range is pre-set to ± 20 μm, the second preset range is pre-set to ± 50 μm, the first frequency is 50 kHz, and the second frequency is 100 kHz.

[0110] First, the difference between the mesh aperture and the target particle size is calculated to be 20 μm, then it is determined that the difference is within the first preset range, and then the ultrasonic generator is controlled to operate at a first frequency, i.e. the ultrasonic generator is set to operate at 50 kHz.

[0111] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0112] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0113] The above descriptions are only specific embodiments of the application to enable a person skilled in the art to understand or implement the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features sought to be applied herein.

Claims

1. A method of using an ultrasonic metal powder screen apparatus, characterized by, The ultrasonic metal powder screen device comprises: a convex outer frame, a screen and an ultrasonic generator, the convex outer frame comprises a base frame and a top frame, the top frame is connected with the base frame through a plurality of support rods, and the top frame protrudes from the base frame; the screen is covered on the top frame and the inclined screen surface between the top frame and the base frame; the ultrasonic generator is in contact with the support rod, and the ultrasonic generator transmits the generated ultrasonic wave along the support rod to the top frame, so that the screen covered on the top frame vibrates; The use method of the ultrasonic metal powder screen device comprises: controlling the metal powder to be sieved to fall from above the ultrasonic metal powder screen device to the screen on the top frame at a predetermined speed; controlling the ultrasonic generator to work to drive the top frame to vibrate through the support rod; collecting the metal powder sieved by the ultrasonic metal powder screen device; obtaining the target particle size of the metal powder to be sieved and the mesh number of the screen; calculating the aperture of the screen hole according to the mesh number of the screen; determining whether the target particle size matches the aperture of the screen hole; when the target particle size does not match the aperture of the screen hole, calculating the difference between the aperture of the screen hole and the target particle size; when the difference is in a first predetermined range, controlling the ultrasonic generator to work at a first frequency; when the difference is in a second predetermined range, controlling the ultrasonic generator to work at a second frequency; the second predetermined range is greater than the first predetermined range, and the second frequency is greater than the first frequency.

2. The method of using an ultrasonic metal powder screen apparatus of claim 1, wherein, The base frame is in a ring structure, the top frame is in a ring structure, and the radius of the top frame is smaller than the radius of the base frame.

3. The method of using an ultrasonic metal powder screen apparatus of claim 1, wherein, The base frame is in a ring structure, the top frame is in a conical structure, and the radius of the bottom surface of the top frame is smaller than the radius of the base frame.

4. The method of using an ultrasonic metal powder screen apparatus according to any one of claims 1 to 3, wherein, The screen is a stainless steel mesh structure integrally formed; the screen is covered on the convex outer frame, and the edges of the screen are bonded to the base frame in the convex outer frame.

5. The method of using an ultrasonic metal powder screen apparatus according to any one of claims 1 to 3, wherein, The screen comprises a top frame screen and an inclined surface screen, the top frame screen is bonded to the top frame, and one end of the inclined surface screen is bonded to the top frame and the other end is bonded to the base frame.

6. The method of using an ultrasonic metal powder screen apparatus of claim 1, wherein, The height difference between the plane where the top frame is located and the plane where the base frame is located is 2-10 mm.

7. The method of using an ultrasonic metal powder screen apparatus of claim 1, wherein, The edge of the base frame is provided with at least one outlet for discharging large blocks or impurities.

8. The method of using an ultrasonic metal powder screen apparatus of claim 1, wherein, The method further comprises: if the target particle size does not match the aperture of the screen hole, controlling the ultrasonic generator to start working; if the target particle size matches the aperture of the screen hole, controlling the ultrasonic generator not to start working.

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