CN114226224A - A screening device for grain ultrafine powder processing - Google Patents
A screening device for grain ultrafine powder processing Download PDFInfo
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- CN114226224A CN114226224A CN202111509219.0A CN202111509219A CN114226224A CN 114226224 A CN114226224 A CN 114226224A CN 202111509219 A CN202111509219 A CN 202111509219A CN 114226224 A CN114226224 A CN 114226224A
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- fine powder
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- 238000012216 screening Methods 0.000 title claims abstract description 69
- 238000009700 powder processing Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 40
- 238000007664 blowing Methods 0.000 claims description 12
- 210000000078 claw Anatomy 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 10
- 238000007790 scraping Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 6
- 239000013590 bulk material Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 12
- 230000000149 penetrating effect Effects 0.000 abstract description 10
- 239000012535 impurity Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 description 13
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- 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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- 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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/55—Cleaning with fluid jets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention relates to the technical field of ultrafine grain powder screening and filtering, and discloses a screening device for ultrafine grain powder processing, which comprises a base and a screening box, wherein the base is connected with a hanging bracket positioned at the top through two vertical supporting frames, a feeding telescopic hose A is communicated between the top of the screening box and the hanging bracket, the screening box, the hanging bracket and the supporting frames are movably arranged, a fine powder filter screen penetrating through the screening box is arranged at the bottom of the screening box, a powder guiding cover fixed on the bottom wall of the fine powder filter screen is covered below the fine powder filter screen, a material receiving box fixed at the top of the base is communicated through a material outlet of the powder guiding cover, an exhaust fan with a filter screen at an air inlet is arranged on the right side wall of the material receiving box, a motor is fixed on the left supporting frame, and the motor pushes a connecting plate connected with the bottom of the screening box through two movable rods. The invention solves the problems that the density of fine powder is high during stacking, the fine powder is difficult to rapidly feed, the screening difficulty is high, and large particles and impurities can block sieve pores to seriously influence the work.
Description
Technical Field
The invention relates to the technical field of grain ultrafine powder screening, in particular to a screening device for grain ultrafine powder processing.
Background
The cereal has high nutritional value, and is usually processed into fine powder to be matched with other ingredients to be prepared into food or drink, larger cereal particles and possibly mixed impurities are generated in the process of preparing the cereal into the ultrafine powder, and therefore, the impurities and the larger particles need to be screened.
The sieve separator type to the ultra-fine powder that uses in the market at present is less, and ubiquitous shortcoming is exactly because the fine powder is too fine, and density when piling up is great, and difficult quick unloading, sieve mesh itself diameter of screen cloth are less, and this difficulty that will lead to the screening is big, and great granule and impurity also can block up the sieve mesh in the screening in addition, seriously influence work.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a screening device for processing grain ultrafine powder, which solves the problems that the density is high when fine powder is accumulated, the rapid feeding is difficult, the screening is difficult, and the sieve pores are blocked by large particles and impurities, so that the work is seriously influenced.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a screening device for processing ultrafine grain powder comprises a base and a screening box, wherein the base is connected with a hanging bracket positioned at the top through two vertical supporting frames, a feeding telescopic hose A is communicated between the top of the screening box and the hanging bracket, and the screening box, the hanging bracket and the supporting frames are movably arranged;
a fine powder filter screen penetrating through the bottom of the screening box is arranged, a powder guiding cover fixed on the bottom wall of the fine powder filter screen covers the lower part of the fine powder filter screen, a material receiving box fixed on the top of the base is communicated through a discharge port of the powder guiding cover, and an exhaust fan with a filter screen at an air inlet is arranged on the right side wall of the material receiving box;
the left support frame is fixed with a motor, and the motor is pushed by two movable rods to be provided with a connecting plate connected with the bottom of the screening box.
Preferably, the sieve filter box comprises four sliding sleeves fixed at four corners of the top of the sieve filter box, a sliding rod with one end fixed on the support frame slides inside the sliding sleeve, the other end of the sliding sleeve is hung on the hanging bracket through a support, a negative pressure blow box is arranged at the corner of the inner bottom wall of the sieve filter box, the negative pressure blow box is connected with a contact plate which is in contact with the side wall of the support frame through a connecting rod penetrating through the sieve filter box, the contact plate is elastically connected with the side wall of the sieve filter box through a spring, a push-pull rod which is movably penetrating through the upper end of the side wall of the sieve filter box is fixed at the upper end of the contact plate, and three groups of powder scattering frames are fixed at the bottom of the end, which is positioned in the sieve filter box.
Preferably, the negative pressure blow box comprises a blow port arranged on one side close to the powder scattering rack, the blow port is in a horn shape, one end with a small diameter is communicated with the side wall of the negative pressure blow box, one end with a large diameter is provided with a separation net for separating fine powder, the middle part of the connecting rod movably penetrates through the side wall of the negative pressure blow box and is fixedly provided with a piston positioned in the negative pressure blow box, and the lower end of the side wall of the negative pressure blow box, which is far away from the blow port, is provided with an air hole penetrating through the outside of the sieving and filtering box.
Preferably, each group of powder scattering frames is three and comprises a tripod fixed at the bottom of the push-pull rod, two rows of powder scraping claws distributed at equal intervals are fixed at the bottom of the tripod through a transverse base plate, the vertical length of each powder scraping claw is half of the numerical length in the screening box, and the movable ranges of the powder scraping claws are all located right above the fine powder filter screen so as to screen the fine powder.
Preferably, the top end of the telescopic hose A penetrates through the top of the hanging bracket, a cover plate with a sealing ring is arranged at the inlet of the telescopic hose A and used for sealing the inlet when the telescopic hose A is closed, and a penetrating breathable net is arranged on the upper surface of the cover plate to prevent fine powder from being brought out when gas in the screening and filtering box flows and realize the effect of air inlet towards the inside of the screening and filtering box.
Preferably, the movable rods are two and are divided into long rods and short rods, one end of each short rod is fixed on the output shaft of the motor, the other end of each short rod is movably hinged to one end of each long rod, the other end of each long rod is movably hinged to the connecting plate, and the bottom end of the connecting plate is arranged on the top of the base in a sliding mode.
Preferably, a material scattering rod is movably inserted into the lower end of the left side wall of the material receiving box, one end, located outside the material receiving box, of the material scattering rod is fixed on the connecting plate, a plurality of pushing rods which are used for pushing, subdividing and flattening are arranged on the outer circular surface, located inside the material receiving box, of the material scattering rod, when the connecting plate moves to the leftmost side, a gap is reserved between the leftmost pushing rod on the material scattering rod and the left side inner wall of the material receiving box, and the material scattering rod is prevented from being blocked when moving.
As preferred, draw powder cover discharge gate position to the left side, the lower extreme is to receiving the state of drawing in between the workbin import, and the top full face cover is in the outside of fine powder filter screen to when avoiding outside gas leakage, better guide segmentation gets into the processing case.
Preferably, a hinged box door is arranged on the side wall of the material receiving box, a circle of sealing strips is arranged at the corner part which is contacted with the material receiving box when the box door is closed to prevent the material receiving box from being subdivided and leaking, and a glass observation window for observing the material loading condition is arranged at the upper end part of the box door.
(III) advantageous effects
Compared with the prior art, the invention provides a screening device for processing grain ultrafine powder, which has the following beneficial effects:
the invention is used for screening when processing ultrafine grain powder, the shaking of the screen box which moves back and forth is realized through the driving of the motor, the shaking screening of fine powder in the box is realized, in addition, when the shaking box is in contact with the support frame, the pushing and pressing of the support frame is realized through the contact of the contact plate, the pushing and pulling rod pulls the powder scattering frame to scrape the internal fine powder, the density increase of the contact of the fine powder positioned at the bottom during screening is avoided, the blowing of the internal fine powder by the blowing port of the negative pressure blowing box is matched, the mesh of the fine powder screen can be constantly in an effective opening state, and the air flow in the screen box is sucked downwards by matching with the exhaust fan at the bottom, so that the fine powder which is about to drop during screening can rapidly pass through the mesh and fall and be collected;
through the collision of the spring on the screening box and the abutting plate, the whole stability of the screening box can be kept when the screening box shakes, the strong vibration is avoided, the damping can be given when the screening box extrudes the spring, the impact is avoided, and the screening box can be helped to return by means of force when returning;
when the connecting plate moves back and forth along with the movable rod, the bulk material rod moves and flattens the fallen and accumulated fine powder in the processing box, so that the space is fully utilized when the processing box receives the material.
Drawings
Fig. 1 is a front view of a sieving apparatus for ultra fine grain processing according to the present invention;
fig. 2 is a sectional view of a sieving apparatus for ultra fine grain processing according to the present invention;
FIG. 3 is a cross-sectional view of a screen box of the present invention;
FIG. 4 is a front view of the bulk powder holder of the present invention;
fig. 5 is a top view of the invention with the receiving bin engaged with the bulk rod.
In the figure: the device comprises a base 1, a screening box 2, a sliding sleeve 21, a sliding rod 22, a negative pressure blowcase 23, a piston 231, a connecting rod 24, a contact plate 25, a spring 26, a push-pull rod 27, a powder scattering frame 28, a tripod 281, a powder scraping claw 282, a support frame 3, a hanging frame 4, an A telescopic hose, a powder guiding cover 5, a powder collecting box 6, a powder scattering rod 61, an exhaust fan 7, a motor 8, a movable rod 9 and a connecting plate 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, the present invention provides a technical solution: a screening device for processing grain ultrafine powder comprises a base 1 and a screening box 2, wherein the base 1 is connected with a hanging bracket 4 positioned at the top through two vertical supporting frames 3, a feeding telescopic hose A is communicated between the top of the screening box 2 and the hanging bracket 4, the screening box 2, the hanging bracket 4 and the supporting frames 3 are movably arranged, the top end of the telescopic hose A penetrates through the top of the hanging bracket 4, when the screening box 2 moves left and right, the telescopic hose A can move while feeding due to the self softer flexibility, a cover plate with a sealing ring is arranged at the inlet of the telescopic hose A and used for sealing the inlet when the screening box is closed, a through breathable net is arranged on the upper surface of the cover plate, when an exhaust fan 7 sucks air flow in the screening box 2, external air flow can be guaranteed to enter the inside of the screening box 2 to provide air flow supply, and fine powder is prevented from being brought out when the air flow in the screening box 2, and the function of air inlet into the screening and filtering box 2 can be realized;
the screening box 2 comprises four sliding sleeves 21 fixed at four corners of the top of the screening box, a sliding rod 22 with one end fixed on the support frame 3 slides in each sliding sleeve 21, the other end is hung on the hanger 4 through a support, when the screening box 2 shakes left and right, the sliding sleeve 21 slides on the sliding rod 22, a negative pressure blow box 23 is arranged at the corner of the inner bottom wall of the screening box 2, the negative pressure blow box 23 is connected with a touch plate 25 in contact with the side wall of the support frame 3 through a connecting rod 24 penetrating through the screening box 2, the middle part of the connecting rod 24 movably penetrates through the side wall of the negative pressure blow box 23 and is fixed with a piston 231 positioned in the negative pressure blow box 23, the lower end of the side wall of the negative pressure blow box 23, far away from the side wall of the blow hole, is provided with an air hole penetrating through the outside of the screening box 2, the touch plate 25 is elastically connected with the side wall of the screening box 2 through a spring 26, and the upper end of the touch plate 25 is fixed with a push-pull rod 27 movably penetrating through the upper end of the side wall of the screening box 2, the bottom of the push-pull rod 27, which is positioned at the inner end of the sieving and filtering box 2, is fixedly provided with three groups of powder scattering frames 28, the negative pressure blowbox 23 comprises a blowhole which is arranged at one side close to the powder scattering frames 28, the blowhole is in a horn shape, one end with a small diameter is communicated with the side wall of the negative pressure blowbox 23, one end with a large diameter is provided with a screen for blocking fine powder, the number of each group of powder scattering frames 28 is three, the powder scattering frames comprise a triangular frame 281 which is fixed at the bottom of the push-pull rod 27, two rows of powder scraping claws 282 which are distributed equidistantly are fixed at the bottom of the triangular frame 281 through a transverse seat plate, the vertical length of the powder scraping claws 282 is half of the numerical length inside the sieving and filtering box 2, the movable ranges of the powder scraping claws 282 are all at positions right above a fine powder filtering screen so as to sieve subdivided, when the motor 8 drives the movable rod 9 to push the connecting plate 10 to move, the sieving and filtering box 2 is driven to shake back and forth, when shaking, the sieving and forth, the sieving box 2 moves to one side, at this moment, the fixed tripod 281 moves along with the movement of the screening box 2 to realize the scraping of the internal fine powder, and meanwhile, the negative pressure air blowing box 23 moves relative to the piston 231, so that the air inside the extrusion is blown to the fine powder inside the screening box 2 through the air blowing port, the fine powder at the mesh position is blown away, and the blocking of large particles is avoided for the sieve mesh outflow space.
A fine powder filter screen penetrating through the bottom of the screening and filtering box 2 is arranged, a powder guiding cover 5 fixed on the bottom wall of the fine powder filter screen is covered below the fine powder filter screen, a material receiving box 6 fixed on the top of the base 1 is communicated through a discharge port of the powder guiding cover 5, a material scattering rod 61 is movably inserted at the lower end of the left side wall of the material receiving box 6, one end of the material scattering rod positioned outside the material receiving box 6 is fixed on a connecting plate 10, a plurality of pushing rods for pushing, subdividing and flattening the material scattering rod 61 are arranged on the outer circumferential surface positioned inside the material receiving box 6, the material scattering rod 61 pushes and flattens the fine powder falling and accumulated inside the material receiving box 6 under the driving of the connecting plate 10, the collection is convenient, when the connecting plate 10 moves to the leftmost side, a gap is reserved between the leftmost pushing rod on the material scattering rod 61 and the left side inner wall of the material receiving box 6 to prevent the material scattering rod 61 from being blocked when the material scattering rod 61 moves, the discharge port of the powder guiding cover 5 is deviated to the left side, the lower end is in a state between inlets of the material receiving box 6, the top end full face mask is arranged outside the fine powder filter screen, so that the fine powder filter screen can be prevented from leaking outside, the fine powder filter screen can better guide fine powder to enter the processing box 6, a hinged box door is arranged on the side wall of the material receiving box 6, a circle of sealing strip is arranged at the corner part of the box door, which is in contact with the material receiving box 6 when the box door is closed, so as to prevent fine powder from leaking, a glass observation window for observing the material loading condition is also arranged at the upper end part of the box door, an exhaust fan 7 with a filter screen at the air inlet is arranged on the right side wall of the material receiving box 6, the exhaust fan 7 is started and is communicated with the fine powder filter screen at the bottom of the screening and filtering box 2 through the material receiving box 6 and the powder guide cover 5, so that the air flow in the screening and filtering box 2 is downwards sucked, and the screened fine powder falls down along with the downward flow of the air flow and falls into the material receiving box 6 to be collected;
be fixed with motor 8 on the left side support frame 3, motor 8 promotes through two movable rods 9 has the connecting plate 10 of connecting 2 bottoms of sieve filter case, movable rod 9 is two, divide into stock and quarter butt, quarter butt one end is fixed on motor 8 output shaft, other end activity hinge is in the one end of stock, the other end of stock then activity hinge is on connecting plate 10, and the bottom of connecting plate 10 slides with 1 top of base and sets up, when motor 8 starts, it is rotatory to drive the quarter butt, articulated stock is along with the removal of the round trip drive connecting plate 10 of rotating.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111509219.0A CN114226224A (en) | 2021-12-10 | 2021-12-10 | A screening device for grain ultrafine powder processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111509219.0A CN114226224A (en) | 2021-12-10 | 2021-12-10 | A screening device for grain ultrafine powder processing |
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| Publication Number | Publication Date |
|---|---|
| CN114226224A true CN114226224A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111509219.0A Pending CN114226224A (en) | 2021-12-10 | 2021-12-10 | A screening device for grain ultrafine powder processing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119016328A (en) * | 2024-10-28 | 2024-11-26 | 吉林远通矿业有限公司 | A high-efficiency screening device and preparation method of diatomaceous earth filler for rubber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253989A (en) * | 2022-08-23 | 2022-11-01 | 广州市一化数字科技有限公司 | Non-contact chemical industry reation kettle |
| CN115253989B (en) * | 2022-08-23 | 2023-08-29 | 安徽昊源化工集团有限公司 | Contactless chemical industry reation kettle |
| CN119016328A (en) * | 2024-10-28 | 2024-11-26 | 吉林远通矿业有限公司 | A high-efficiency screening device and preparation method of diatomaceous earth filler for rubber |
| CN119016328B (en) * | 2024-10-28 | 2025-03-04 | 吉林远通矿业有限公司 | A high-efficiency screening device and preparation method of diatomaceous earth filler for rubber |
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Application publication date: 20220325 |