CN111957579A - Powder screening method and system - Google Patents
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- CN111957579A CN111957579A CN201910420846.3A CN201910420846A CN111957579A CN 111957579 A CN111957579 A CN 111957579A CN 201910420846 A CN201910420846 A CN 201910420846A CN 111957579 A CN111957579 A CN 111957579A
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- 239000000843 powder Substances 0.000 title claims abstract description 385
- 238000012216 screening Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007873 sieving Methods 0.000 claims abstract description 74
- 239000002245 particle Substances 0.000 claims description 67
- 238000000605 extraction Methods 0.000 claims description 22
- 239000011362 coarse particle Substances 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000013077 target material Substances 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
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Abstract
The invention discloses a powder screening method and a powder screening system, and relates to the technical field of target material preparation. The screening method of the invention comprises the following steps: screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set; acquiring the weight of the plurality of powder sets obtained by screening; calculating the powder sieving rate information according to the weight of the powder sets obtained by sieving; and if the powder sieving rate information meets the preset sieving condition, carrying out sieving treatment on the moderate-particle-size powder set. The powder screening method and the powder screening system can realize automatic sieving treatment of the powder, improve the powder screening accuracy and reduce the labor and time cost of powder production.
Description
Technical Field
The invention relates to the technical field of target material preparation, in particular to a powder screening method and a powder screening system.
Background
In the conventional thin-film solar cell chip, a functional film layer such as a window layer, an absorption layer and the like is usually formed on a substrate by adopting a magnetron sputtering method, and a target material is a sputtering source in magnetron sputtering. The target material adopted in the preparation of the thin-film solar cell chip generally comprises a backing tube and an alloy powder coating coated on the outer peripheral surface of the backing tube, the preparation of the alloy powder used for the target material generally comprises three steps of smelting, atomizing and screening, wherein the powder screening is to flow powder with different particle sizes into different powder receiving barrels respectively according to different screens, so that powder with the particle size range meeting the process requirements is obtained, and the powder is used for spraying the backing tube to prepare the target material. In order to improve the screening accuracy and more accurately obtain powder with a particle size range meeting the process requirements so as to ensure the spraying quality of subsequent targets, the powder collecting barrel needs to be manually disassembled and assembled at present, and the powder in the powder collecting barrel is poured back into the screening machine by manpower, so that the powder screening efficiency is low, and the production cost of the targets is higher.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present invention provide a powder screening method and system, which solve the problems of low powder screening accuracy and low powder screening efficiency in the prior art.
The powder screening method of the embodiment of the invention comprises the following steps:
screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set;
acquiring the weight of the plurality of powder sets obtained by screening;
calculating the powder sieving rate information according to the weight of the powder sets obtained by sieving;
and if the powder sieving rate information meets the preset sieving condition, carrying out sieving treatment on the moderate-particle-size powder set.
According to the powder screening method, the powder screening rate information is obtained through calculation of the weight of a plurality of powder sets obtained through screening after each screening, and then the screening effect of each time is judged according to the powder screening rate information and preset screen returning conditions, and whether the screen returning treatment needs to be carried out on the powder sets with the proper particle size is determined. The powder screening method of the embodiment realizes automatic sieving treatment of the powder, and removes the powder which is mixed with the powder with the moderate particle size and is not in the qualified particle size range, so that the precision of powder screening is improved, the production quality of subsequent target materials is improved, and the labor cost and the time cost of powder production can be reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic flow diagram of some embodiments of the powder sieving method of the present invention;
FIG. 2 is a schematic flow diagram of some embodiments of step S40 of the powder sieving method of the present invention;
FIG. 3 is a block diagram of the construction of some embodiments of the powder screening system of the present invention;
figure 4 is a schematic diagram of the structure of some embodiments of the powder screening system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Referring to fig. 1, a schematic flow diagram of some embodiments of a powder sieving method of embodiments of the present invention is shown. The powder sieving method of this example includes:
step S10: screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set;
it should be noted that, in this embodiment, the powder to be sieved may be atomized powder directly obtained from a discharge port of the atomization chamber, or may be powder that needs to be put into a sieving device after sieving treatment for sieving treatment again. Here, the powder set refers to a set of powders having the same characteristics, and in this embodiment, the plurality of powder sets are divided into a fine-particle-size powder set, a medium-particle-size powder set, and a coarse-particle-size powder set according to the particle size range of the powders, where the medium-particle-size powder set refers to a powder set of a particle size range (i.e., an acceptable particle size range) satisfying process requirements, the particle size of the powders in the medium-particle-size powder set should be within the acceptable particle size range, the particle size of the powders in the fine-particle-size powder set is smaller than a lower threshold of the acceptable particle size range, and the particle size of the powders in the coarse-particle-size powder set is larger than an upper threshold of the acceptable particle.
In this step, a plurality of powder aggregates obtained by sieving the powder to be sieved after being processed by the sieving device may be loaded in a plurality of collecting containers, for example: a collecting bucket.
Step S20: acquiring the weights of a plurality of powder sets obtained by screening;
in the step, the weight of the powder of each powder set, including the weight of the fine particle size powder set, the weight of the medium particle size powder set and the weight of the coarse particle size powder set, can be directly detected by the weight detection sensor, and certainly, the weight of the powder of each powder set can be indirectly calculated by detecting the volume of each powder set and integrating the information such as the density of the powder, and the like, so as to be used as a basis for subsequently determining the powder screening effect.
Step S30: calculating according to the weights of a plurality of powder sets obtained by screening to obtain powder screening rate information;
in this step, the sieving rate information of the powder to be sieved can be obtained by calculating according to the weight of the powder to be sieved, the weight of the fine particle size powder set, the weight of the medium particle size powder set, the weight of the coarse particle size powder set, and the like, for example: the powder proportion of the qualified particle size range in the powder to be screened, the proportion of coarse powder in the powder to be screened, the proportion of fine powder in the powder to be screened and the like.
Step S40: and if the powder sieving rate information meets the preset sieving condition, carrying out sieving treatment on the powder set with the moderate particle size.
Because the influence of the particle size of the powder on the quality of the spraying target material is large, the accuracy of powder screening is strict, and the concentrated mixing of the powder with the proper particle size into the powder which is not in the qualified particle size range is reduced as much as possible, therefore, the effect of the screening needs to be judged according to the powder screening rate information after the screening, and compared with the preset screen returning condition, if the powder screening rate information obtained by the screening meets the preset screen returning condition, the screen returning treatment needs to be carried out on the powder with the proper particle size, the powder which is not in the qualified particle size range is further rejected, and the accuracy of the powder screening is improved.
It should be noted that the preset back-sieving condition in this embodiment may be that the ratio of the powder weight of the medium-size powder set to the weight of the powder to be sieved satisfies a certain preset proportion threshold, or the ratio of the powder weight of the fine-size powder set to the weight of the powder to be sieved satisfies a certain preset proportion threshold, or the ratio of the powder weight of the coarse-size powder set to the weight of the powder to be sieved satisfies a certain preset proportion threshold, where the preset proportion threshold is determined according to empirical data summarized in an actual powder preparation process, and is not specifically limited herein.
In summary, the powder screening method according to the embodiment of the present invention obtains the powder screening rate information by calculating the weight of the plurality of powder sets obtained by screening after each screening, and then determines the effect of each screening according to the powder screening rate information and the preset back-screening condition and determines whether the back-screening process needs to be performed on the powder set with the proper particle size. The powder screening method of the embodiment realizes automatic sieving treatment of the powder, and removes the powder which is mixed with the powder with the moderate particle size and is not in the qualified particle size range, so that the precision of powder screening is improved, the production quality of subsequent target materials is improved, and the labor cost and the time cost of powder production can be reduced.
Alternatively, as shown in fig. 2, the step S40 of performing the back-screening process on the medium-sized powder set in the embodiment includes:
step S41: extracting powder of the powder set with the moderate particle size;
in this embodiment, the powder of the powder aggregate with medium particle size may be extracted into the sieving device by an extraction device, which may be a dust suction device or a vacuum device, as long as it can provide sufficient suction force to extract the powder into the sieving device, and is not limited herein.
Step S42: detecting the residual weight of the powder set with the moderate particle size in real time;
the present embodiment requires real-time detection of the remaining weight of the powder of the medium-sized powder collection during the extraction of the powder of the medium-sized powder collection, and of course, real-time detection of the powder capacity of the collection container loaded with the medium-sized powder collection to determine whether the extraction process is completed.
Step S43: and if the residual weight of the powder of the moderate-particle-size powder set is less than a preset weight threshold value, performing re-screening treatment on the extracted powder of the moderate-particle-size powder set.
In this embodiment, when the remaining powder weight of the powder set with the moderate particle size is smaller than the preset weight threshold, the extraction process is ended, and the sieving device is started to perform the powder sieving process.
According to the powder screening method provided by the embodiment of the invention, after the fact that the powder set with the moderate particle size needs to be subjected to the back screening treatment is determined, the powder set with the moderate particle size is taken as the powder to be screened and is extracted into the screening device for secondary screening treatment, so that the automatic back screening control of the powder is realized, the automation degree of powder screening is improved, and the powder production efficiency is further improved.
Optionally, in order to ensure the smoothness of the automatic sieving process of the powder, the preset weight threshold value is 30g-60g in the embodiment. Preferably, the preset weight threshold is 30g in this embodiment.
In some embodiments, the powder sieving information in step 30 includes a fine powder rate and a coarse powder rate, the fine powder rate calculated from the weight of the fine particle size powder set and the weight of the powder to be sieved; and calculating the coarse powder rate according to the weight of the coarse particle size powder set and the weight of the powder to be sieved. The accuracy of the powder of the moderate-particle-size powder set obtained by each screening can be rapidly and directly judged through the calculated fine powder rate or coarse powder rate.
In some embodiments, the step of determining whether the powder sieving rate information satisfies the preset sieving back condition in step 40 includes:
if the fine powder rate is greater than the first sieving-back threshold value, sieving-back treatment is carried out on the powder set with the moderate particle size obtained by sieving;
and/or if the coarse powder rate is larger than a second re-screening threshold value, performing re-screening treatment on the screened moderate-particle-size powder set.
Because the fine powder is easy to deform and the coarse powder is easy to agglomerate in the high-speed spraying process, if the fine powder or the coarse powder with moderate particle size is concentrated and mixed, the quality of the sprayed target material is greatly influenced, therefore, if the fine powder rate or the coarse powder rate obtained by screening is higher, the situation that more fine powder or coarse powder possibly exists in the powder to be screened is indicated, the medium-particle-size powder set needs to be screened again to remove the fine powder or coarse powder mixed with the medium-particle-size powder set as far as possible, therefore, in this embodiment, the preset back-sieving condition may be set to perform back-sieving on the powder set with a moderate particle size when the fine powder rate is greater than the first back-sieving threshold or the coarse powder rate is greater than the second back-sieving threshold, and certainly, if both the fine powder rate and the coarse powder rate are greater, the yield of the powder is lower, the screening device or the powder atomizing device needs to be checked to determine the reason causing low powder yield when the medium-particle-size powder set needs to be subjected to the back screening treatment.
It should be noted that, in this embodiment, the first sieving threshold and the second sieving threshold are determined according to an actual powder production situation, and are not specifically limited herein.
Optionally, in this embodiment, the range of the first sift-back threshold is 8% to 12%, and the range of the second sift-back threshold is 4% to 6%. Preferably, in this embodiment, the first sifting back threshold is 10%, and the second sifting back threshold is 4%.
Optionally, in this embodiment, the particle size range of the fine particle size powder set is smaller than 38um, the particle size range of the coarse particle size powder set is larger than 95um, and the particle size range of the medium particle size powder set is larger than or equal to 38um and smaller than or equal to 95 um.
Referring to fig. 3, an embodiment of the present invention further provides a powder sieving system, including:
the screening device 10 is used for screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set;
a check weighing device 20 for acquiring the weights of the plurality of powder sets obtained by screening;
the calculation processing device 30 is used for calculating the powder sieving rate information according to the weights of the powder sets obtained by sieving and judging whether the powder set with the moderate particle size needs to be subjected to sieving back according to the powder sieving rate information;
an extraction device 40 for extracting powder of the medium particle size powder collection to a screening device for re-screening treatment.
The powder screening system provided by the embodiment of the invention obtains a plurality of powder sets by screening the powder to be screened through the screening device, detects the weights of the powder sets through the check weighing device, obtains the powder screening rate information through the calculation processing device, judges the screening effect each time according to the powder screening rate information and the preset screen returning condition, determines whether the powder set with the proper particle size needs to be subjected to screen returning treatment or not, and extracts the powder of the powder set with the proper particle size into the screening device for secondary screening through the extraction device when the powder set with the proper particle size needs to be subjected to screen returning treatment. The powder screening system of the embodiment realizes automatic sieving treatment of the powder, and powder which is mixed with moderate powder and is not in the qualified particle size range is removed, so that the powder screening accuracy is improved, the production quality of subsequent targets is improved, and the labor cost and the time cost of powder production can be reduced.
Alternatively, the computing processing device 30 of the present embodiment may be a Programmable Logic Controller (PLC), and may also be other types of controllers, which are not illustrated herein.
In some embodiments, as shown in fig. 4, the checkweigher 20 includes a plurality of checkweigher sensor units 21 respectively disposed on the plurality of powder collecting units 11 of the sieving device 10, each powder collecting unit 11 for receiving a corresponding powder set. Alternatively, the sieving apparatus 10 of the present embodiment includes three powder collecting units 11 for loading the fine particle size powder aggregate, the medium particle size powder aggregate, and the coarse particle size powder aggregate, respectively.
Alternatively, the check weight device 20 of the present embodiment includes two check weight sensor units 21 provided at the bottom of the powder collecting unit 11 that loads the fine particle size powder collection and the medium particle size powder collection, respectively.
Alternatively, as shown in fig. 4, the checkweigher 20 of the present embodiment further includes a load detection platform 22 disposed below the powder collection unit 11, and the load cell 21 is disposed on the load detection platform 22.
In some embodiments, in order to realize the automatic control of the powder back-screening, as shown in fig. 4, the extraction device 40 includes an electromagnetic valve unit 41 and an extraction unit 42, the electromagnetic valve unit 41 is disposed on the discharge port of the powder collection unit 11, the extraction unit 42 is respectively connected to the feed port of the sieving device 10 and the discharge port of the powder collection unit 11, when the powder collection with medium particle size needs to be back-screened, the calculation processing device 30 controls the valve of the electromagnetic valve unit 41 to open, and controls the extraction unit 42 to extract the powder in the powder collection unit 11 loaded with the powder collection with medium particle size into the sieving device 10.
It should be noted that in the present embodiment, the open state of the solenoid valve unit 41 refers to energizing the solenoid valve unit to control the opening of the valve of the solenoid valve unit, and the close state of the solenoid valve unit 41 refers to de-energizing the solenoid valve unit to control the closing of the valve of the solenoid valve unit.
The powder screening system of this embodiment confirms powder screening rate information through calculating processing apparatus according to the powder weight of the powder collection unit of examining heavy device detection, and judge whether powder screening rate information satisfies and predetermine back the condition of sieving, when needs go back the sieve processing to moderate particle diameter powder set, send control signal, the valve of control solenoid valve unit is opened, the simultaneous control extraction device begins work, powder extraction in the powder collection unit that extraction device will load moderate particle diameter powder set is in order to carry out the powder back the sieve in the screening, thereby realize the automatic back sieve control of powder.
In the present embodiment, the calculation processing device 30 is connected to the solenoid valve unit 41, the checkweigher 20, and the extraction unit 42, and only needs to be capable of transmitting a control signal, and may be connected by wire or wirelessly. The wireless connection may be, for example, WIFI, near field communication, or the like.
Optionally, in this embodiment, the extraction unit 42 is connected to the inlet of the sieving device 10 and the outlet of the powder collection unit 11 through a conduit 43. Preferably, the conduit 43 of this embodiment is a non-metallic conduit to avoid contamination of the powder by reaction with the conduit. Further preferably, the duct of the embodiment is a transparent duct with a smooth inner wall, so as to prevent the powder from attaching to the inner wall of the duct, and to observe the movement of the powder in the duct in time, and to find out blockage and other phenomena in time.
The following describes the implementation of the powder sieving system of the present invention for automatic powder sieving, with reference to a specific embodiment:
wherein the pre-screening condition is that the ratio of the weight of the fine powder to the weight of the powder to be screened (powder fed into the screening device) is more than 10%.
1. Starting a screening device 10 to perform primary screening treatment on powder to be screened;
2. after the first screening is finished, inputting the total weight M KG of the powder to be screened on a panel of a PLC (programmable logic controller), and automatically weighing the powder collection unit 11 with the particle size of 38-95 microns and the powder in the powder collection unit 11 with the particle size of less than 38 microns by using the weight detection device 20, wherein the weights are respectively marked as weight A and weight B; if the calculated fine powder rate is less than 10%, namely B/M is 100% < 10%, the sieved powder does not need to be sieved again;
if the fine powder rate is greater than 10%, namely B/M is 100% > 10%, the PLC controller will send a control signal to control the valve of the electromagnetic valve unit 41 to open and control the extraction unit 42 to start working, the powder in the powder collection unit with the particle size of 38 μ M to 95 μ M is sent to the sieving device 10, when the check weighing device 20 detects that the weight of the powder in the powder collection unit 11 with the particle size of 38 μ M to 95 μ M is less than 30g, the PLC controller will control the valve of the electromagnetic valve unit 41 to close and control the extraction unit 42 to stop working, and the powder enters the sieving device 10 to be sieved for the second time.
3. After the second screening is finished, inputting the total weight A of the powder to be screened (namely the weight of the powder in the powder collecting unit 11 with the particle size of 38-95 microns obtained by the first screening) on a panel of a PLC (programmable logic controller), and respectively recording the weight of the powder in the powder collecting unit 11 with the particle size of 38-95 microns and the weight of the powder in the powder collecting unit 11 with the particle size of <38 microns, which are automatically weighed by the second screening post-checkweigher 20 as the weight A1 and the weight B1; if the calculated fine powder rate is less than 10%, namely (B1-B)/A100% < 10%, the powder after the second sieving does not need to be sieved again; and if the fine powder rate is more than 10%, performing third screening on the powder in the powder collecting unit 11 with the particle size of 38-95 μm after the second screening.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A powder screening method, comprising:
screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set;
acquiring the weight of the plurality of powder sets obtained by screening;
calculating the powder sieving rate information according to the weight of the powder sets obtained by sieving;
and if the powder sieving rate information meets the preset sieving condition, carrying out sieving treatment on the moderate-particle-size powder set.
2. A powder screening method according to claim 1, wherein the step of back-screening the collection of medium size powders comprises:
extracting powder of the set of medium particle size powders;
detecting the powder residual weight of the moderate-particle-size powder set in real time;
and if the residual weight of the powder of the moderate-particle-size powder set is less than a preset weight threshold value, performing re-screening treatment on the extracted powder of the moderate-particle-size powder set.
3. A powder screening method according to claim 2, wherein the predetermined weight threshold is 30g-60 g.
4. A powder sieving method according to claim 1, wherein the step of obtaining powder sieving ratio information calculated from the weights of the plurality of powder sets obtained by sieving comprises:
calculating according to the weight of the fine-particle-size powder set and the weight of the powder to be screened to obtain a fine powder rate;
calculating according to the weight of the coarse particle size powder set and the weight of the powder to be screened to obtain a coarse powder rate;
wherein the powder sieving rate information includes a fine powder rate and a coarse powder rate.
5. A powder screening method according to claim 4, wherein the step of performing a backsize process on the set of medium-sized powders if the powder screening rate information satisfies a preset backsize condition includes:
if the fine powder rate is greater than a first sieving-back threshold value, sieving back the moderate-particle-size powder set obtained by sieving;
and/or if the coarse powder rate is larger than a second re-screening threshold value, performing re-screening treatment on the medium-particle-size powder set obtained by screening.
6. A powder screening method according to claim 5, wherein the first regrind threshold is in the range 8% -12% and the second regrind threshold is in the range 4% -6%.
7. A powder screening method according to any one of claims 1 to 6, wherein the fine particle size powder set has a particle size range of less than 38um, the coarse particle size powder set has a particle size range of greater than 95um, and the medium particle size powder set has a particle size range of greater than or equal to 38um and less than or equal to 95 um.
8. A powder screening system, comprising:
the screening device is used for screening powder to be screened with a certain weight to obtain a plurality of powder sets, wherein the powder sets comprise a fine-particle-size powder set, a moderate-particle-size powder set and a coarse-particle-size powder set;
the weight detecting device is used for acquiring the weights of the powder sets obtained by screening;
the calculation processing device is used for calculating to obtain powder sieving rate information according to the weight of the powder sets obtained by sieving and judging whether the powder set with the moderate particle size needs to be subjected to sieving back according to the powder sieving rate information;
an extraction device for extracting the powder of the set of medium particle size powders to a screening device for a re-screening process.
9. A powder screening system according to claim 8, wherein the checkweigher includes a plurality of checkweigher sensor units respectively provided on a plurality of powder collection units of the screening device, each of the powder collection units being adapted to receive a respective powder collection.
10. The powder screening system of claim 8, wherein the extraction device comprises an electromagnetic valve unit and an extraction unit, the electromagnetic valve unit is arranged on a discharge port of the powder collection unit, the extraction unit is respectively connected with a feed port of the screening device and a discharge port of the powder collection unit, when the moderate-particle-size powder set needs to be subjected to back screening treatment, the calculation processing device controls a valve of the electromagnetic valve unit to be opened, and controls the extraction unit to extract powder in the powder collection unit loaded with the moderate-particle-size powder set into the screening device.
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| CN117055483A (en) * | 2023-08-11 | 2023-11-14 | 北京维他科技有限公司 | Production control method of sodium iron ethylenediamine tetraacetate |
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| CN117055483B (en) * | 2023-08-11 | 2024-02-06 | 北京维他科技有限公司 | Production control method of sodium iron ethylenediamine tetraacetate |
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