CN219880544U - Screening plant is used in production of light calcium carbonate former stone - Google Patents
Screening plant is used in production of light calcium carbonate former stone Download PDFInfo
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- CN219880544U CN219880544U CN202321501040.5U CN202321501040U CN219880544U CN 219880544 U CN219880544 U CN 219880544U CN 202321501040 U CN202321501040 U CN 202321501040U CN 219880544 U CN219880544 U CN 219880544U
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- calcium carbonate
- light calcium
- raw stone
- production
- stirring
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 239000004575 stone Substances 0.000 title claims abstract description 37
- 238000012216 screening Methods 0.000 title claims abstract description 30
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 121
- 238000003860 storage Methods 0.000 claims abstract description 46
- 238000007599 discharging Methods 0.000 claims abstract description 29
- 238000003756 stirring Methods 0.000 claims description 62
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 abstract description 28
- 238000000034 method Methods 0.000 description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 9
- 235000017491 Bambusa tulda Nutrition 0.000 description 9
- 241001330002 Bambuseae Species 0.000 description 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 9
- 239000011425 bamboo Substances 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model provides a screening device for producing light calcium carbonate raw stone, which comprises a cylindrical frame, wherein a plurality of springs are vertically arranged at the top of the frame, a bottom groove is commonly arranged at the top of the springs, an L-shaped fine material discharging hole is formed in the side end of the bottom groove, a screen cylinder with an opening at the bottom is arranged at the top of the bottom groove, a feed hopper, a screen, a coarse material discharging hole, a vibrating motor, an eccentric weight, a first material storage cylinder, a first control valve, a second material storage cylinder and a second control valve are arranged at the lower end of the second material storage cylinder. The screening device for the production of the light calcium carbonate raw stone can not only rapidly and efficiently screen the light calcium carbonate raw stone powder, but also prevent the device from stopping and waiting when a user conveniently changes a receiving device by arranging the powder temporary storage structure at a discharge hole, thereby avoiding influencing the screening efficiency of the device on the light calcium carbonate raw stone powder.
Description
Technical Field
The utility model belongs to the technical field of screening devices, and particularly relates to a screening device for producing light calcium carbonate raw stone.
Background
In the process of producing and processing the light calcium carbonate raw stone, screening treatment is needed by utilizing a screening device, and the commonly used screening device is a disc vibrating screen.
The existing disc vibrating screen can meet the requirement of screening light calcium carbonate raw stone, but the discharge port of the device is not provided with a temporary storage structure and other discharge auxiliary structures, so that a user needs to directly move a receiving device such as a packaging bag to a position matched with discharge in the working process, and in the process of replacing the receiving device, if the screening device is not enabled to stop working and continuously discharge, powder is easily caused to be spilled on the ground, so that powder waste is caused, and if the screening device is enabled to stop working in order to meet the requirement of replacing the receiving device, the screening efficiency of the device is affected; therefore, the existing screening device brings great inconvenience to the use of people.
Disclosure of Invention
In view of the defects in the prior art, the utility model provides the screening device for the production of the light calcium carbonate raw stone, which not only can rapidly and efficiently screen the light calcium carbonate raw stone powder, but also can prevent the device from being stopped and waiting while a user conveniently changes the receiving device by arranging the powder temporary storage structure at the discharge hole, thereby avoiding influencing the screening efficiency of the device on the light calcium carbonate raw stone powder.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a screening plant is used in production of light calcium carbonate former stone, which comprises a cylindrical frame, the vertical a plurality of springs that are provided with in top of frame, the top of a plurality of springs is provided with the kerve jointly, the bottom side of kerve is provided with the fine material discharge gate of L type, the top of kerve is provided with bottom open-ended screen cylinder, the top of screen cylinder is provided with the feeder hopper, be provided with the screen cloth on the lower extreme inside wall of screen cylinder, the side of screen cylinder is provided with the coarse fodder discharge gate with screen cloth looks adaptation and dislocation with the fine material discharge gate, the level of kerve is vertically provided with vibrating motor, all be provided with eccentric weight on two output shafts of vibrating motor, the fine material discharge gate lower extreme is provided with the first stock cylinder that the lower extreme is cone, the lower extreme of first stock cylinder is provided with first control valve, the coarse fodder discharge gate lower extreme is provided with the second stock cylinder that the lower extreme is cone, the lower extreme of second stock cylinder is provided with the second control valve. The first control valve and the second control valve are electromagnetic valves.
As a further improvement of the utility model, the bottom side end of the stand is also provided with an extension plate, the extension plate is welded and fixed with the bottom side end of the stand, and the extension plate is also provided with foundation bolts for fixing with the ground.
As a further improvement of the utility model, the top of the horizontal part of the fine material discharging hole is vertically provided with a first stirring motor with an output shaft penetrating through the horizontal part of the fine material discharging hole, the lower end of the output shaft of the first stirring motor is provided with a first stirring shaft, the first stirring shaft is provided with a first stirring blade matched with the first material storing barrel, and the first stirring blade is welded and fixed with the first stirring shaft.
As a further improvement of the utility model, a second stirring motor with an output shaft penetrating through the horizontal part of the fine material discharge port is vertically arranged at the top of the horizontal part of the coarse material discharge port and corresponds to the position of the second material storage cylinder, a second stirring shaft is arranged at the lower end of the output shaft of the second stirring motor, a second stirring blade matched with the second material storage cylinder is arranged on the second stirring shaft, and the second stirring blade is welded and fixed with the second stirring shaft.
As a further improvement of the utility model, the side end of the first stock barrel is provided with a first transparent observation window, and the side end of the second stock barrel is provided with a second transparent observation window.
As a further improvement of the utility model, the two side ends of the vibration motor are also provided with the threaded connecting cylinders, the threaded connecting cylinders are welded and fixed with the side ends of the vibration motor, the inner side walls of the two threaded connecting cylinders are also provided with the threaded fixing cylinders, the side ends of the threaded fixing cylinders are also provided with the protective covers which are covered on the outer sides of the corresponding eccentric weights, the connection parts of the threaded connecting cylinders and the threaded connecting cylinders are also provided with the reinforcing bolts, and the protective covers are also provided with the screwing rods through which a user can conveniently screw and adjust the protective covers, so that the threaded connection of the threaded connecting cylinders and the threaded connecting cylinders is conveniently realized or released.
Compared with the prior art, the utility model has the following beneficial effects: firstly, the two eccentric weights can be driven to rotate by the vibrating motor, so that the bottom groove and the screen drum vibrate, raw stone powder added into the screen drum through the feed hopper is screened, raw stone powder coarse materials and raw stone powder fine materials are discharged through the coarse material discharge port and the fine material discharge port respectively and fall into the coarse material receiving device and the fine material receiving device respectively; when the coarse material receiving device needs to be cleaned or replaced, coarse materials can be temporarily stored through the second material storage barrel only by closing the second control valve, and then the coarse materials can be continuously received by opening the control valve; similarly, the fine materials can be temporarily stored through the first control valve and the first storage barrel, so that a user can conveniently clean and replace the fine material receiving device, after the fine materials are received, when enough fine materials are received in the fine material receiving device and need to be replaced or cleaned after a period of time, the first control valve can be closed firstly, and when the obtained fine material receiving device returns to the lower part of the fine material discharging hole again, the first control valve can be opened, so that the fine materials in the first storage barrel fall into the receiving device, and the first storage barrel can vibrate under the driving of the fine material discharging hole, so that the discharging process of the fine materials in the first storage barrel becomes smooth; so that the user can clean or replace the receiving device without stopping the device, thereby improving the screening efficiency; because the first stock barrel and the second stock barrel can vibrate along with the bottom groove and the screen barrel, the discharging process of the first stock barrel and the second stock barrel can be smooth.
Secondly, the device can be prevented from discharging in the working process by matching the extension plate with the foundation bolt; through first transparent observation window, the user can conveniently look over the quantity of powder in the first material storage barrel, through the transparent observation window of second, the user can conveniently look over the quantity of powder in the second material storage barrel.
Thirdly, through the cooperation of the first stirring motor, the first stirring shaft and the first stirring blade, the fine materials in the first material storage barrel can be conveniently stirred, so that the raw stone powder in the first material storage barrel is discharged more smoothly; through the cooperation of second agitator motor, second (mixing) shaft and second stirring vane, can conveniently stir the processing to the fine material in the second material storage section of thick bamboo to the former stone powder in the messenger second material storage section of thick bamboo goes out the ejection of compact more smoothly.
Fourth, through the protection casing, can cover the protection to eccentric pouring weight, avoid producing the potential safety hazard, through the cooperation of threaded connection section of thick bamboo and screw thread fixed cylinder, can set up the protection casing to vibrating motor's both sides in a flexible way, can strengthen the fastness of the junction of threaded connection section of thick bamboo and threaded connection section of thick bamboo through the reinforcing bolt to effectively avoid the protection casing to drop from eccentric pouring weight, thereby protect eccentric pouring weight more steadily.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic structural view of a frame, a fine material outlet, a first stirring motor, a first stirring shaft, a first stirring blade, an extension plate and anchor bolts;
FIG. 3 is a schematic diagram of the structure of the screen drum, screen, coarse material outlet, second stirring motor, second stirring shaft and second stirring blade;
fig. 4 is a schematic structural view of the vibration motor, the threaded connecting cylinder, the threaded fixing cylinder, the protective cover, the reinforcing bolt and the screwing rod.
In the figure: 101. a frame; 102. a spring; 103. a bottom groove; 104. a fine material outlet; 105. a screen drum; 106. a feed hopper; 107. a screen; 108. a coarse material discharge port; 109. a vibration motor; 110. an eccentric weight; 111. a first stock barrel; 112. a first control valve; 113. a second stock barrel; 114. a second control valve; 115. an extension plate; 116. an anchor bolt; 201. a first stirring motor; 202. a first stirring shaft; 203. a first stirring blade; 204. a second stirring motor; 205. a second stirring shaft; 206. a second stirring blade; 301. a threaded connection barrel; 302. a screw thread fixing cylinder; 303. a protective cover; 304. reinforcing bolts; 305. and (5) screwing the rod.
Detailed Description
For a better understanding of the present utility model, the following examples are set forth to further illustrate the utility model, but are not to be construed as limiting the utility model. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details.
As shown in fig. 1, a screening device for producing light calcium carbonate raw stone comprises a cylindrical rack 101, wherein a plurality of springs 102 are vertically arranged at the top of the rack 101, a bottom groove 103 is commonly arranged at the top of the springs 102, an L-shaped fine material discharging hole 104 is arranged at the bottom side end of the bottom groove 103, a screen drum 105 with an opening at the bottom is arranged at the top of the bottom groove 103, a feed hopper 106 is arranged at the top of the screen drum 105, a screen 107 is arranged on the inner side wall of the lower end of the screen drum 105, a coarse material discharging hole 108 which is matched with the screen 107 and is staggered with the fine material discharging hole 104 is arranged at the side end of the screen drum 105, a vibrating motor 109 is vertically arranged at the level of the bottom groove 103, eccentric weights 110 are arranged on two output shafts of the vibrating motor 109, a first material storing drum 111 with a conical lower end is arranged at the lower end of the fine material discharging hole 104, a first control valve 112 is arranged at the lower end of the first material storing drum 111, a second material storing drum 113 with a conical lower end is arranged at the lower end of the coarse material discharging hole 108, and a second control valve 114 is arranged at the lower end of the second storing drum 113. The first control valve 112 and the second control valve 114 are solenoid valves.
Only the vibration motor 109 is started, the vibration motor 109 drives the two eccentric weights 110 to rotate, and the bottom groove 103 and the screen cylinder 105 vibrate, so that preparation for screening the light calcium carbonate raw stone powder is made; the light calcium carbonate raw stone powder to be screened can be added into the screening barrel through the feed hopper 106, the raw stone powder can fall onto the screen 107, the finer raw stone powder can fall into the bottom tank 103 through the screen holes of the screen 107, the coarser raw stone powder can stay on the screen 107 because the coarse stone powder cannot pass through the screen holes of the screen 107 and is discharged at the coarse material discharge port 108 under the action of vibration, the coarse stone powder falls into the coarse material receiving device arranged below the coarse material discharge port 108 through the second material storage barrel 113, the raw stone powder fine material falls into the bottom tank 103, then runs towards the side end under the action of vibration, leaves the bottom tank 103 through the fine material discharge port 104 and the first material storage barrel 111 for material treatment, and falls into the fine material receiving device arranged below the fine material discharge port 104, so that the screening treatment of the light calcium carbonate raw stone powder is realized.
After a period of time, when enough fine materials are received in the fine material receiving device and need to be replaced or cleaned, the first control valve 112 can be closed first, and the fine materials which are obtained to fall down through the fine material discharging hole 104 fall into the first material storage barrel 111 for suspension, so that the fine materials are prevented from being scattered in the process of replacing or cleaning the fine material receiving device later; when the fine material receiving device returns to the lower part of the fine material discharging hole 104, the first control valve 112 can be opened, so that the fine materials in the first material storage barrel 111 fall into the receiving device, and the fine materials in the first material storage barrel 111 can be discharged smoothly because the first material storage barrel 111 can vibrate under the driving of the fine material discharging hole 104.
After a period of time, when enough coarse materials are received in the coarse material receiving device and need to be replaced or cleaned, the second control valve 114 can be closed first, and the fine materials which are obtained to fall down through the fine material discharging hole 104 fall into the second material storage barrel 113 for suspension, so that the coarse material receiving device is prevented from being scattered in the process of replacing or cleaning later; when the coarse material receiving device returns to the lower part of the coarse material discharging hole 108 again, the second control valve 114 can be opened, so that coarse materials in the second material storage barrel 113 fall into the receiving device, and the second material storage barrel 113 can vibrate under the driving of the coarse material discharging hole 108, so that the discharging process of fine materials in the second material storage barrel 113 is smoother.
According to another embodiment of the present utility model, as shown in fig. 2, an extension plate 115 is further disposed at a bottom side end of the frame 101, the extension plate 115 is welded to the bottom side end of the frame 101, and anchor bolts 116 for fixing with the ground are further disposed on the extension plate 115. The anchor bolts 116 can be made to pass through the extension plate 115 and be connected with the ground during the operation of the device, so that the device is prevented from easily shifting during the operation, and the anchor bolts 116 can be made to be separated from the ground when the device needs to be moved.
According to another embodiment of the present utility model, as shown in fig. 2, a first stirring motor 201 with an output shaft penetrating through the horizontal portion of the fine material discharging port 104 is further vertically arranged at the position of the top of the horizontal portion of the fine material discharging port 104 corresponding to the first material storage barrel 111, a first stirring shaft 202 is arranged at the lower end of the output shaft of the first stirring motor 201, a first stirring blade 203 matched with the first material storage barrel 111 is arranged on the first stirring shaft 202, and the first stirring blade 203 is welded and fixed with the first stirring shaft 202. When coarse materials temporarily stored in the first storage cylinder 111 are subjected to the receiving process by the fine material receiving device, in order to promote the efficiency of discharging, the first stirring motor 201 may be started, so that the first stirring shaft 202 and the first stirring blade 203 stir the fine materials in the first storage cylinder 111, thereby enabling the raw stone powder in the first storage cylinder 111 to be discharged more smoothly.
According to another embodiment of the present utility model, as shown in fig. 3, a second stirring motor 204 with an output shaft penetrating through the horizontal part of the fine material discharging port 104 is further vertically arranged at the top of the horizontal part of the coarse material discharging port 108 corresponding to the position of the second material storage barrel 113, a second stirring shaft 205 is arranged at the lower end of the output shaft of the second stirring motor 204, a second stirring blade 206 adapted to the second material storage barrel 113 is arranged on the second stirring shaft 205, and the second stirring blade 206 is welded and fixed with the second stirring shaft 205. When the coarse material temporarily stored in the second stock barrel 113 is carried out with the coarse material carrying device, in order to promote the efficiency of discharging, the second stirring motor 204 may be started, so that the coarse material in the second stock barrel 113 is stirred by the second stirring shaft 205 and the second stirring blade 206, and the raw stone powder in the second stock barrel 113 is discharged more smoothly.
According to another embodiment of the present utility model, a side end of the first storage cylinder 111 is provided with a first transparent viewing window, and a side end of the second storage cylinder 113 is provided with a second transparent viewing window. Through the first transparent viewing window, the user can conveniently view the amount of powder in the first storage cylinder 111, and through the second transparent viewing window, the user can conveniently view the amount of powder in the second storage cylinder 113.
According to another embodiment of the present utility model, as shown in fig. 4, the two side ends of the vibration motor 109 are further provided with screw connection cylinders 301, the screw connection cylinders 301 are welded and fixed with the side ends of the vibration motor 109, the inner side walls of the two screw connection cylinders 301 are further provided with screw fixing cylinders 302 in a screw mode, the side ends of the screw fixing cylinders 302 are further provided with protection covers 303 which are covered on the outer sides of the corresponding eccentric weights 110, the connection parts of the screw connection cylinders 301 and the screw connection cylinders 301 are further provided with reinforcing bolts 304, and the protection covers 303 are further provided with screw rods 305. Through the cooperation of threaded connection section of thick bamboo 301 and the fixed section of thick bamboo 302 of screw, can set up the protection casing 303 to the both sides of vibrating motor 109 in a flexible way, can strengthen the fastness of the junction of threaded connection section of thick bamboo 301 and threaded connection section of thick bamboo 301 through the reinforcing bolt 304 to effectively avoid protection casing 303 to drop from eccentric weight 110, thereby protect eccentric weight 110 more steadily.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.
Claims (7)
1. Screening plant is used in production of light calcium carbonate former stone, includes cylindric frame (101), its characterized in that: the top of frame (101) is vertical to be provided with a plurality of springs (102), the top of a plurality of springs (102) is provided with kerve (103) jointly, the bottom side of kerve (103) is provided with fine material discharge gate (104) of L type, the top of kerve (103) is provided with bottom open-ended screen drum (105), the top of screen drum (105) is provided with feeder hopper (106), be provided with screen cloth (107) on the lower extreme inside wall of screen drum (105), the side of screen drum (105) is provided with coarse material discharge gate (108) with screen cloth (107) looks adaptation and with fine material discharge gate (104) dislocation, the level of kerve (103) is vertical to be provided with vibrating motor (109), all be provided with eccentric weight (110) on two output shafts of vibrating motor (109), the lower extreme of fine material discharge gate (104) is provided with first feed cylinder (111) that the lower extreme is the cone, the lower extreme of first feed cylinder (111) is provided with first control valve (112), the side of being provided with screen cloth (107) is provided with coarse material discharge gate (108) looks adaptation and second feed cylinder (113) that the lower extreme is the cone-shaped, second feed cylinder (113) is provided with second control valve (114).
2. A screening device for the production of light calcium carbonate raw stone according to claim 1, characterized in that: the first control valve (112) and the second control valve (114) are electromagnetic valves.
3. A screening device for the production of light calcium carbonate raw stone according to claim 1 or 2, characterized in that: the bottom side end of the stand (101) is also provided with an extension plate (115), and the extension plate (115) is also provided with an anchor bolt (116) for fixing with the ground.
4. A screening device for the production of light calcium carbonate raw stone according to claim 3, characterized in that: the top of the horizontal part of the fine material discharging hole (104) corresponds to the position of the first material storage barrel (111), a first stirring motor (201) with an output shaft penetrating through the horizontal part of the fine material discharging hole (104) is further vertically arranged, a first stirring shaft (202) is arranged at the lower end of the output shaft of the first stirring motor (201), and a first stirring blade (203) matched with the first material storage barrel (111) is arranged on the first stirring shaft (202).
5. A screening device for the production of light calcium carbonate raw stone according to claim 4, characterized in that: the top of the horizontal part of the coarse material discharge hole (108) corresponds to the position of the second material storage barrel (113), a second stirring motor (204) with an output shaft penetrating through the horizontal part of the fine material discharge hole (104) is further vertically arranged, a second stirring shaft (205) is arranged at the lower end of the output shaft of the second stirring motor (204), and a second stirring blade (206) matched with the second material storage barrel (113) is arranged on the second stirring shaft (205).
6. A screening device for the production of light calcium carbonate raw stone according to claim 5, characterized in that: the side end of the first storage barrel (111) is provided with a first transparent observation window, and the side end of the second storage barrel (113) is provided with a second transparent observation window.
7. A screening device for the production of light calcium carbonate raw stone according to claim 6, characterized in that: the vibration motor is characterized in that threaded connecting cylinders (301) are further arranged at two side ends of the vibration motor (109), threaded fixing cylinders (302) are further arranged on inner side walls of the two threaded connecting cylinders (301) in a threaded mode, a protective cover (303) which is arranged on the outer side of the corresponding eccentric weight (110) in a covering mode is further arranged at the side end of each threaded fixing cylinder (302), reinforcing bolts (304) are further arranged at the joint of the threaded connecting cylinders (301) and the threaded connecting cylinders (301), and a screwing rod (305) is further arranged on each protective cover (303).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321501040.5U CN219880544U (en) | 2023-06-13 | 2023-06-13 | Screening plant is used in production of light calcium carbonate former stone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321501040.5U CN219880544U (en) | 2023-06-13 | 2023-06-13 | Screening plant is used in production of light calcium carbonate former stone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219880544U true CN219880544U (en) | 2023-10-24 |
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ID=88406861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321501040.5U Active CN219880544U (en) | 2023-06-13 | 2023-06-13 | Screening plant is used in production of light calcium carbonate former stone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219880544U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117139144A (en) * | 2023-11-01 | 2023-12-01 | 江苏威拉里新材料科技有限公司 | Metal powder screening mechanism |
-
2023
- 2023-06-13 CN CN202321501040.5U patent/CN219880544U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117139144A (en) * | 2023-11-01 | 2023-12-01 | 江苏威拉里新材料科技有限公司 | Metal powder screening mechanism |
| CN117139144B (en) * | 2023-11-01 | 2024-01-23 | 江苏威拉里新材料科技有限公司 | Metal powder screening mechanism |
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