CN218945564U - Metal powder screening device - Google Patents

Abstract

The utility model relates to a metal powder screening device. The metal powder screening device comprises an electromagnetic vibrator, a bottom shell, a filter screen, a dust cover and an ultrasonic vibration piece. The top end of the bottom shell is provided with a mounting opening. Fine powder discharging holes and coarse powder discharging holes are formed at intervals at the bottom end of the bottom shell. The opening position of the coarse powder discharging hole in the bottom shell is lower than that of the coarse powder discharging hole in the bottom shell. The electromagnetic vibrator is installed at the bottom of the bottom shell. The filter screen sealing cover is sealed on the mounting opening. The position of the filter screen opposite to the coarse powder discharge hole is provided with a coarse powder port. The dust cover is arranged at the mounting opening and the sealing cover is closed at the mounting opening. A screening space is formed between the inner wall of the dust cover and the filter screen in a surrounding mode. The top of shield is formed with the feed inlet with sieve material space intercommunication. The ultrasonic vibration piece is connected with the filter screen. The metal powder screening device has the advantages of small volume and light weight while having higher screening effect and screening efficiency.

Description

Metal powder screening device

Technical Field

The utility model relates to the technical field of metal additive manufacturing, in particular to a metal powder screening device.

Background

Additive manufacturing is an effective technology without die opening and rapid forming, and is characterized in that a three-dimensional entity is converted into a two-dimensional section through computer slicing software, and laser beams are utilized to selectively melt the paved powder of each layer, and the layers are stacked layer by layer to form a workpiece.

Powder sieving is an important process step in metal additive manufacturing processes. And in the additive manufacturing process, redundant powder generated by frequent powder spreading and scraping actions and powder remained on the surface of a formed workpiece are recovered and screened, and the screened powder meeting the requirements can be reused. At present, most of powder screening devices for metal additive manufacturing are rotary vibrating screens or manually detached powder tank transportation screening. The existing rotary vibrating screen generally uses a vibrating motor as a vibrating source, has large vibrating noise and heavy body, and is not convenient to be installed into metal additive manufacturing equipment for integrated design. And the single vibrating motor power source screening form, powder screening process is easy to block the screen cloth, and screening efficiency is lower. The other mode of screening is transported to the manual disassembly powder jar of adoption, and artifical participation intensity of labour is big, wastes time and energy, and screening efficiency is extremely low.

Disclosure of Invention

Based on the above, it is necessary to provide a metal powder screening device with compact structure and high screening efficiency, aiming at the problems of low screening efficiency, large size and heavy weight of the conventional metal powder screening device.

A metal powder screening apparatus comprising:

an electromagnetic vibrator;

the bottom shell is of a hollow shell structure; a mounting opening is formed at the top end of the bottom shell; fine powder discharge holes and coarse powder discharge holes are formed at intervals at the bottom end of the bottom shell; the opening position of the coarse powder discharging hole in the bottom shell is lower than that of the coarse powder discharging hole in the bottom shell; the electromagnetic vibrator is arranged at the bottom of the bottom shell; the fine powder discharging hole is positioned between the coarse powder discharging hole and the electromagnetic vibrator;

the filter screen is sealed on the mounting port and is sealed with the edge of the opening of the coarse powder discharging hole in the bottom shell; a coarse material port communicated with the coarse powder filtering hole is formed in the position, opposite to the coarse powder discharging hole, of the filtering screen;

the dustproof cover is arranged at the mounting opening and is sealed with the mounting opening; a screening space is formed between the inner wall of the dust cover and the filter screen in a surrounding manner; a feed inlet communicated with the screening space is formed at the top end of the dust cover;

the ultrasonic vibration piece is connected with the filter screen and used for carrying out vibration cleaning on the filter screen so as to clean metal powder adsorbed on the filter screen.

Above-mentioned metal powder screening plant, when arranging in the horizontal plane, electromagnetic vibrator, drain pan, filter sieve and shield set up along vertical ascending direction in proper order, so filter sieve transversely sets up, and metal powder belongs to the granule object moreover, so shield and drain pan all can set up to flat structure, are favorable to metal powder screening plant's miniaturization and lightweight. When the electromagnetic sieve is used, the electromagnetic vibrator provides vibrating force for the filter sieve so as to perform vibrating screening on metal powder on the filter sieve, the metal powder sieved by the filter sieve is discharged from the fine powder discharge hole, and the screened metal coarse powder gradually moves towards the direction of the coarse material opening under the action of the vibrating force until being discharged from the coarse powder discharge hole; further, the ultrasonic vibration piece can carry out vibration cleaning to the filter screen to clear away the metal powder that will adsorb on the filter screen, with the probability that reduces the filter screen and be blocked up, be favorable to the promotion of screening efficiency and screening effect. Therefore, the metal powder screening device has the advantages of small size and light weight while having higher screening effect and screening efficiency.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic view of a metal powder screening apparatus according to a preferred embodiment of the present utility model;

FIG. 2 is an exploded view of the metal powder screening device of FIG. 1;

FIG. 3 is a schematic view of the bottom housing of the metal powder screening apparatus of FIG. 1;

FIG. 4 is a schematic view of the dust cap of the metal powder screening apparatus of FIG. 1;

fig. 5 is a bottom view of the dust cap of fig. 4.

Reference numerals in the detailed description indicate: 100. a metal powder screening device; 110. an electromagnetic vibrator; 120. a bottom case; 121. a mounting port; 122. fine powder discharge holes; 123. coarse powder discharge holes; 124. a bottom plate; 125. a side plate; 126. a mounting plate; 1261. screening holes; 127. a baffle; 128. a fines chamber; 1291. a fine material discharging connecting pipe; 1292. coarse material discharging connecting pipe; 1293. an air inlet; 130. filtering and screening; 131. a coarse material opening; 140. a dust cover; 141. a feed inlet; 142. an air outlet; 143. a top plate; 144. a riser; 145. a striker plate; 1451. a material blocking opening; 146. a pressing plate; 147. a hook plate; 148. a hooking groove; 150. an ultrasonic vibration member; 160. locking buckles; 170. a first seal; 180. a second seal; 190. and an observation window.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present unless otherwise specified. It will also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements or one or more intervening elements may also be present.

Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless explicitly defined as such, e.g., "consisting of … …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.

Further, the drawings are not 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings and are not necessarily drawn to true scale.

Fig. 1 and 2 show the structure of a metal powder screening device according to an embodiment of the present utility model. For convenience of explanation, the drawings show only structures related to the embodiments of the present utility model.

Referring to fig. 1 and 2, a metal powder sieving apparatus 100 according to a preferred embodiment of the present utility model is used for sieving and recovering metal powder generated during metal additive manufacturing, precious metal processing, etc. In the embodiment of the present utility model, the metal powder sieving apparatus 100 is used for sieving metal powder generated in the metal additive manufacturing process, for example. The metal powder screening device 100 includes an electromagnetic vibrator 110, a bottom case 120, a filter screen 130, a dust cover 140, and an ultrasonic vibrator 150.

Referring to fig. 3, the bottom case 120 is a hollow housing structure. The top end of the bottom case 120 is formed with a mounting opening 121. Specifically, the opening direction of the mounting port 121 coincides with the vertically upward direction. Fine powder discharge holes 122 and coarse powder discharge holes 123 are formed at intervals at the bottom of the bottom case 120. The coarse powder discharge hole 123 has a lower opening position in the bottom case 120 than the coarse powder discharge hole 123. The electromagnetic vibrator 110 is mounted to the bottom of the bottom case 120. The fine powder discharge hole 122 is located between the coarse powder discharge hole 123 and the electromagnetic vibrator 110. Specifically, the electromagnetic vibrator 110 is mounted at an end of the bottom case 120 remote from the coarse powder discharge hole 123.

The filter screen 130 is sealed to the mounting port 121 and seals against the edge of the opening in the bottom housing 120 where the coarse powder discharge port 123 is located. The filter screen 130 is provided with a coarse fodder port 131 communicating with the coarse fodder discharging hole 123 at a position opposite to the coarse fodder discharging hole 123. Because the opening position of coarse powder discharge hole 123 in drain pan 120 is higher than the opening position of fine powder discharge hole 122 in drain pan 120, so when filter screen 130 and coarse powder discharge hole 123 are sealed at the opening edge in drain pan 120, the lower surface of filter screen 130 and drain pan 120 are equipped with the position interval setting of fine powder discharge hole 122 to buffer the metal fine powder after filter screen 130 sieves, avoid appearing the metal fine powder can't in time discharge from fine powder discharge hole 122 and cause filter screen 130 to block up the condition, when guaranteeing that metal powder screening plant 100 has great effective screening area, improve the reliability of use.

Referring to fig. 4, the dust cap 140 is mounted on the mounting opening 121, and seals the mounting opening 121. A screening space (not shown) is defined between the inner wall of the dust cap 140 and the filter screen 130. A feed port 141 communicating with the screening space is formed at the top end of the dust cover 140. Specifically, the feed port 141 is located above the electromagnetic vibrator 110. Therefore, the metal powder directly falls onto the filter screen 130 after entering the screening space through the feed inlet 141, so as to facilitate the subsequent vibration screening.

Referring to fig. 1 and 2 again, the ultrasonic vibration member 150 is connected to the filter screen 130 and is used for vibration cleaning of the filter screen 130 to clean the metal powder adsorbed on the filter screen 130. During use of the metal powder screening apparatus 100 described above, the ultrasonic vibration member 150 is controlled to provide a vibration force that causes the filter screen 130 to vibrate reciprocally in at least one direction to effect cleaning of the metal powder adsorbed on the filter screen 130.

For ease of understanding, the operation of the metal powder screening device 100 described above will be briefly described: the metal powder is conveyed into the screening space through the feed inlet 141 and directly falls onto the filter screen 130; meanwhile, the electromagnetic oscillator applies a vibrating force to the bottom shell 120 to drive the filter screen 130 to vibrate, so that the metal powder on the filter screen 130 is subjected to vibration screening; the sieved metal fine materials are discharged and collected through the fine powder discharging holes 122; the metal coarse materials after screening move towards the coarse material opening 131 under the vibration force of the vibrating screen until being discharged and collected from the coarse material discharging holes 123; while the vibrating screen performs vibrating screening on the metal powder, the ultrasonic vibration member 150 performs vibrating removal on the metal powder adsorbed on the filter screen 130, which is advantageous in improving screening effect and screening efficiency.

Therefore, the metal powder screening device 100 has the advantages of small size and light weight while having high screening effect and high screening efficiency.

Referring again to fig. 3, in some embodiments, the bottom chassis 120 includes a bottom plate 124, a side plate 125 disposed along a circumferential direction of the bottom plate 124 and connected to the bottom plate 124, a mounting plate 126 fixed to an end of the side plate 125 remote from the bottom plate 124, and a baffle 127 disposed along the circumferential direction of the mounting plate 126. A fines chamber 128 is defined between the bottom plate 124 and the side plate 125. The forward projection of the mounting plate 126 onto the base plate 124 completely covers the base plate 124. The mounting plate 126 is provided with a screen hole 1261 communicating with the fine material chamber 128 and a coarse material discharge hole 123 communicating with the outside at intervals. The end of the bottom plate 124 adjacent to the coarse powder discharge hole 123 is provided with a fine powder discharge hole 122. A baffle 127 is secured to the side of the mounting plate 126 facing away from the base plate 124 and forms a mounting opening 121 around the mounting plate 126. The filter screen 130 seals against the mounting plate 126 and seals against the open edges of the coarse powder discharge aperture 123. The dust cap 140 is covered in the mounting opening 121 and is sealed and pressed on the side of the filter screen 130 facing away from the bottom plate 124. Thus, the mounting plate 126 forms an annular mounting platform with the shroud 127 to facilitate the mounting of the filter screen 130 and dust cap 140. And the mounting plate 126 is larger than the bottom plate 124, and coarse powder discharge holes 123 are formed in the portion of the mounting plate 126 extending from the bottom plate 124, so as to facilitate the discharge of the metal coarse material screened on the filter screen 130 from the bottom case 120.

Further, in some embodiments, the bottom plate 124, the mounting plate 126, and the filter screen 130 are all rectangular in shape. The openings of the coarse fodder port 131 and the coarse fodder discharging hole 123 are elongated openings arranged along the narrow side direction of the filter screen 130. The coarse powder discharge holes 123 and the electromagnetic vibrators 110 are disposed at intervals along the longitudinal direction of the filter screen 130, and are respectively located at both ends of the bottom case 120. Thereby, the metal powder on the filter screen 130 moves in the longitudinal direction of the filter screen 130 by the vibrating force provided by the electromagnetic vibrator 110, and vibration screening is performed during the movement until the screened metal coarse material moves to the position of the coarse material port 131 and is discharged from the coarse material discharge hole 123. Therefore, the coarse material openings 131 and the coarse material discharge holes 123 are elongated openings along the narrow side direction of the filter screen 130, so that the screened metal coarse material is discharged more easily, and the screening efficiency is further improved.

Further, in some embodiments, bottom shell 120 also includes coarse material discharge nozzle 1292 and fine material discharge nozzle 1291. One end of the coarse material discharge nozzle 1292 is fixed to the outside of the mounting plate 126 and communicates with the coarse material discharge hole 123. One end of the fines discharge nozzle 1291 is secured to the outer side of the floor 124 and communicates with the fines discharge aperture 122. The coarse material discharging connecting pipe 1292 and the fine material discharging connecting pipe 1291 may be straight pipes, bent pipes or the like with pipe diameters regardless of the pipe diameters, or straight pipes or bent pipes with pipe diameters gradually reduced along the direction deviating from the bottom shell 120. Specifically in this embodiment, coarse material discharge take-over 1292 and fine material discharge take-over 1291. In practical application, hoses can be respectively connected to the coarse material discharging connecting pipe 1292 and the fine material discharging connecting pipe 1291 to convey the screened metal coarse material and metal fine material to preset positions respectively, and other components can be not additionally connected to the coarse material discharging connecting pipe 1292 and the fine material discharging connecting pipe 1291, and the screened metal coarse material and metal fine material can be discharged and recycled into a container which is placed in advance by directly utilizing the coarse material discharging connecting pipe 1292 and the fine material discharging connecting pipe 1291. Accordingly, the provision of coarse material discharge nozzle 1292 and fine material discharge nozzle 1291 improves the convenience of use of metal powder screening apparatus 100 described above.

Referring again to fig. 1, 3 and 4, further, in some embodiments, the sidewall of the fines discharge nozzle 1291 is formed with an inlet 1293 for accessing the inert gas vessel. The dust cap 140 has an air outlet 142 formed at the top end thereof. In the metal powder screening process, inert gas enters the fine material cavity 128 through the gas inlet 1293, enters the screening space through the screen 130 and finally is discharged through the gas outlet 142, so that an inert gas flow is formed in the metal powder screening device 100, an inert gas protection environment is provided for the metal powder screening process, and the metal powder screening quality is further improved while the safety is also improved.

In some embodiments, the dust cap 140 includes a top plate 143, and a riser 144 disposed along a circumference of the top plate 143 and coupled to the top plate 143. The top plate 143 is formed with a feed port 141. One end of the vertical plate 144, which is far from the top plate 143, is installed in the installation opening 121 and is sealed and pressed against the edge portion of the filter screen 130. Specifically, when the bottom case 120 includes the bottom plate 124, the side plates 125, the mounting plate 126, and the baffle 127, an end of the vertical plate 144 remote from the top plate 143 is received in the baffle 127, and presses the filter screen 130 against the side of the mounting plate 126 facing away from the bottom plate 124. More specifically, the top plate 143 is the same shape as the bottom plate 124. Thus, the dust cap 140 has a hollow structure with one end thereof being opened by splicing the plate bodies.

Referring also to fig. 5, in some embodiments, the dust cap 140 further includes a striker plate 145 fixed to the inner side of the riser 144 and spaced from the top plate 143. The baffle 145 is provided with a baffle opening 1451. The forward projection of the feed port 141 onto the dam 145 partially overlaps the forward projection of the dam port 1451 onto the dam 145. The material blocking opening 1451 may be an opening with a shape of a circle, a rectangle, a polygon, or the like. In this embodiment, the material blocking opening 1451 is an elongated opening disposed along the narrow side direction of the filter screen 130. Since the material blocking opening 1451 is partially aligned with the material inlet 141 in the vertical direction, the setting of the material blocking plate 145 can slow down the falling speed of the metal powder fed from the material inlet 141, so as to reduce the probability of impact damage of the metal powder to the screen surface of the filter screen 130 during feeding, and further prolong the service life of the metal powder screening device 100.

Further, in some embodiments, the dust cover 140 further includes a pressing plate 146 disposed outside an end of the vertical plate 144 away from the top plate 143 in the circumferential direction of the top plate 143, and a hook plate 147 disposed on a side of the pressing plate 146 toward the top plate 143 in the circumferential direction of the pressing plate 146. An annular hooking groove 148 is formed between the vertical plate 144, the pressing plate 146 and the hooking plate 147. The pressing plate 146 and the hook plate 147 are both disposed in the mounting port 121.

The metal powder screening device 100 further includes a plurality of locking buckles 160 spaced apart along the circumference of the top plate 143. One end of each locking buckle 160 is installed on the bottom shell 120, and the other end is matched and locked with the hooking groove 148, so that the pressing plate 146 and the filter screen 130 are sequentially pressed against the installation opening 121.

Specifically, when the bottom case 120 includes the bottom plate 124, the side plate 125, the mounting plate 126 and the baffle 127, one end of the locking buckle 160 is mounted on the side plate 125, and the other end is locked with the hooking groove 148 in a matching manner, so that the pressing plate 146 and the filter screen 130 are sequentially pressed against the edge portion of the mounting plate 126, and at this time, the pressing plate 146, the filter screen 130 and the mounting plate 126 are sequentially stacked in the vertical direction.

The hooking groove 148 is provided to facilitate the locking buckle 160 to lock the dust cap 140 and the bottom case 120 together. The locking buckle 160 is convenient for detachably mounting the dust cover 140 and the bottom shell 120, so that the convenience of processing and maintaining the metal powder screening device 100 is improved.

Still further, in some embodiments, the metal powder screening device 100 further includes a first seal 170 and a second seal 180. The first seal 170 is disposed along the circumference of the filter screen 130 and is clamped between the edge of the filter screen 130 and the pressure plate 146. The second seal 180 is clamped at the contact between the edge of the filter screen 130 and the inner wall of the bottom case 120.

Specifically, when the bottom chassis 120 includes the bottom plate 124, the side plates 125, the mounting plate 126, and the baffle 127, the second seal 180 is clamped between the filter screen 130 and the edge portion of the mounting plate 126. Wherein the second seal 180 seals the contact between the edge portion of the coarse fodder port 131 and the mounting plate 126, and also seals the contact between the edge portion of the filter screen 130 and the mounting plate 126. Therefore, the arrangement of the first sealing member 170 and the second sealing member 180 improves the sealing property between the dust cover 140 and the filter screen 130 and between the bottom case 120 and the filter screen 130, so as to further improve the screening quality.

In some embodiments, a viewing port (not shown) is provided at the top end of the dust cap 140. A viewing window 190 for viewing the metal powder on the filter screen 130 is detachably installed at the viewing port. The observation window 190 may be made of a non-transparent material, and if the metal powder on the filter screen 130 needs to be observed, the observation window 190 needs to be opened; the observation window 190 may be made of transparent material, and if the metal powder on the filter screen 130 needs to be observed, the observation window 190 may be directly observed without opening. Therefore, the setting of the observation window 190 can facilitate the staff to observe the condition of the metal powder on the filter screen 130 in real time, so that the staff can adjust the feeding amount of the metal powder in real time, and the use convenience of the metal powder screening device 100 is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A metal powder screening apparatus, comprising:

an electromagnetic vibrator;

the bottom shell is of a hollow shell structure; a mounting opening is formed at the top end of the bottom shell; fine powder discharge holes and coarse powder discharge holes are formed at intervals at the bottom end of the bottom shell; the opening position of the coarse powder discharging hole in the bottom shell is lower than that of the coarse powder discharging hole in the bottom shell; the electromagnetic vibrator is arranged at the bottom of the bottom shell; the fine powder discharging hole is positioned between the coarse powder discharging hole and the electromagnetic vibrator;

the filter screen is sealed on the mounting port and is sealed with the edge of the opening of the coarse powder discharging hole in the bottom shell; a coarse material port communicated with the coarse material discharging hole is formed in the position, opposite to the coarse material discharging hole, of the filter screen;

the dustproof cover is arranged at the mounting opening and is sealed with the mounting opening; a screening space is formed between the inner wall of the dust cover and the filter screen in a surrounding manner; a feed inlet communicated with the screening space is formed at the top end of the dust cover;

the ultrasonic vibration piece is connected with the filter screen and used for carrying out vibration cleaning on the filter screen so as to clean metal powder adsorbed on the filter screen.

2. The metal powder screening device according to claim 1, wherein the bottom case includes a bottom plate, a side plate provided along a circumferential direction of the bottom plate and connected to the bottom plate, a mounting plate fixed to an end of the side plate away from the bottom plate, and a baffle provided along a circumferential direction of the mounting plate; a fine material cavity is formed between the bottom plate and the side plate in a surrounding mode; the forward projection of the mounting plate on the bottom plate completely covers the bottom plate; the mounting plate is provided with screening holes communicated with the fine material cavity at intervals and coarse powder discharging holes communicated with the outside at intervals; the fine powder discharging hole is formed in one end, close to the coarse powder discharging hole, of the bottom plate; the baffle is fixed on one side of the mounting plate, which is away from the bottom plate, and the mounting opening is formed around the mounting plate;

the filter screen is tightly adhered to the mounting plate in a sealing way and is sealed with the opening edge of the coarse powder discharging hole; the dust cover is covered in the mounting opening and is tightly pressed on one side of the filter screen, which is away from the bottom plate.

3. The metal powder screening device of claim 2, wherein the bottom plate, the mounting plate, and the filter screen are rectangular in shape; the openings of the coarse material opening and the coarse material discharging hole are strip-shaped openings arranged along the narrow side direction of the filter screen; the coarse powder discharging holes and the electromagnetic vibrators are arranged at intervals along the long side direction of the filter screen and are respectively positioned at two ends of the bottom shell.

4. The metal powder screening device of claim 2, wherein the bottom shell further comprises a coarse material discharge nipple and a fine material discharge nipple; one end of the coarse material discharging connecting pipe is fixed on the outer side of the mounting plate and is communicated with the coarse material discharging hole; one end of the fine material discharging connecting pipe is fixed on the outer side of the bottom plate and is communicated with the fine material discharging hole.

5. The metal powder screening apparatus according to claim 4, wherein a sidewall of the fines discharge nozzle is formed with an air inlet for communicating with an inert gas vessel; an air outlet is formed at the top end of the dust cover.

6. The metal powder screening device of claim 1, wherein the dust cap includes a top plate, a riser disposed circumferentially of the top plate and connected to the top plate; the top plate is provided with the feed inlet; one end of the vertical plate, which is far away from the top plate, is arranged in the mounting opening and is tightly pressed at the edge part of the filter screen.

7. The metal powder screening device of claim 6, wherein the dust cap further comprises a striker plate secured to the inside of the riser and spaced from the top plate; a material blocking opening is formed in the material blocking plate; the forward projection of the feed inlet on the baffle plate is overlapped with the forward projection of the feed inlet on the baffle plate.

8. The metal powder screening device according to claim 6, wherein the dust cover further comprises a pressing plate provided outside one end of the riser, which is away from the top plate, in a circumferential direction of the top plate, and a hook plate provided on a side of the pressing plate, which is toward the top plate, in the circumferential direction of the pressing plate; an annular hooking groove is formed by surrounding the vertical plate, the pressing plate and the hooking plate; the pressing plate and the hook plate are arranged in the mounting port;

the metal powder screening device further comprises a plurality of locking buckles which are arranged at intervals along the circumferential direction of the top plate; one end of each locking buckle is installed on the bottom shell, and the other end of each locking buckle is matched and locked with the hooking groove so as to sequentially press the pressing plate and the filter screen to the installation opening.

9. The metal powder screening device of claim 8, further comprising a first seal and a second seal; the first sealing piece is arranged along the circumferential direction of the filter screen and is clamped between the edge of the filter screen and the pressing plate; the second seal is clamped at the contact between the edge of the filter screen and the inner wall of the bottom shell.

10. The metal powder screening device of claim 1, wherein an observation port is formed in the top end of the dust cover; and an observation window for observing the condition of the metal powder on the filter screen is detachably arranged at the observation opening.

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