CN113280615B - Dry-mixed mortar production raw material drying and screening treatment system - Google Patents
Dry-mixed mortar production raw material drying and screening treatment system Download PDFInfo
- Publication number
- CN113280615B CN113280615B CN202110599644.7A CN202110599644A CN113280615B CN 113280615 B CN113280615 B CN 113280615B CN 202110599644 A CN202110599644 A CN 202110599644A CN 113280615 B CN113280615 B CN 113280615B
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- screening
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- 238000001035 drying Methods 0.000 title claims abstract description 117
- 239000002994 raw material Substances 0.000 title claims abstract description 88
- 238000012216 screening Methods 0.000 title claims abstract description 66
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 claims description 52
- 238000007599 discharging Methods 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
- F26B11/14—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a horizontal or slightly-inclined plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
- F26B23/06—Heating arrangements using electric heating resistance heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/14—Sand
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a dry-mixed mortar production raw material drying and screening treatment system which comprises a screening box, a collecting box and a drying device, wherein the collecting box is arranged right below the screening box, the lower end of the collecting box is connected with the existing ground, and the drying device is arranged between the upper end of the collecting box and the lower end of the screening box.
Description
Technical Field
The invention relates to the field of dry-mixed mortar, in particular to a dry-mixed mortar production raw material drying and screening treatment system.
Background
Dry-mixed mortar (also called dry-mixed mortar in the early days) is usually called hydraulic cement mixed mortar, and refers to a granular or powdery material which is physically mixed according to a certain proportion by dried and screened aggregate (such as quartz sand), inorganic cementing material (such as cement) and additive (such as polymer) and is transported to a construction site in a bag or in bulk form, and the material can be directly used after being mixed with water, and is also called as mortar dry powder, dry mixture and dry-mixed powder, some building adhesives belong to the class, the application range of the dry-mixed mortar is very wide, but the manufacturing process of the dry-mixed mortar is very complicated, before the dry-mixed mortar is manufactured, the production raw materials for manufacturing the dry-mixed mortar need to be dried and screened so that the produced dry-mixed mortar meets the quality requirements, but most of the existing dry-mixed mortar production raw material drying and screening treatment systems often have the following problems in the drying and screening of gravels in the production raw materials for dry-mixed mortar:
1. in the drying process, the falling speed of the screened production raw materials is too high, the raw materials cannot be fully dried, and the drying degree of the production raw materials of the dry-mixed mortar cannot be controlled, so that the drying effect of the raw materials is poor;
2. the existing drying and screening system only dries the raw materials of the dry-mixed mortar for one time, so that the raw materials are not thoroughly dried, and when the dried raw materials are collected and secondarily dried, the raw materials are easily accumulated together, so that the aggregate is not sufficient and the drying speed is very slow.
Disclosure of Invention
Technical scheme (I)
In order to achieve the purpose, the invention adopts the following technical scheme that the dry-mixed mortar production raw material drying and screening treatment system comprises a screening box, a material collecting box and a drying device, wherein the material collecting box is arranged right below the screening box, the lower end of the material collecting box is connected with the existing ground, and the drying device is arranged between the upper end of the material collecting box and the lower end of the screening box.
The drying device comprises a drying box, vent pipes, communicating pipes, branch pipes, drying pipes, vent holes, mounting rods, trapezoidal blocks, wedge blocks, a supporting plate, a lifting rod, a linkage rod, an electric push rod and a discharging pipe, wherein the drying box is arranged under a screening box, the vent pipes are arranged in the drying box and distributed front and back, one end of one vent pipe penetrates through the side wall of the drying box, the communicating pipes are arranged between the two vent pipes, the branch pipes are arranged at equal intervals from left to right at the upper ends of the two vent pipes, the drying pipes are arranged at the upper ends of the branch pipes and consist of straight pipes and inclined pipes, the vent holes are uniformly formed in the outer wall of the drying pipe from top to bottom and along the circumferential direction of the outer wall of the drying pipe, through holes are formed in the upper end of the drying pipe, the mounting rods are slidably connected in the through holes, the lower ends of the mounting rods are positioned in the drying pipe, the trapezoidal blocks are arranged at equal intervals from top to bottom on the outer wall of the mounting rods, the trapezoid blocks are uniformly distributed along the circumferential direction of the installation rod, the wedge blocks are in sliding fit on the inclined surfaces of the trapezoid blocks, the height of the wedge blocks is gradually increased from inside to outside, one ends, far away from the installation rod, of the wedge blocks are located in the vent holes of the straight pipe portion of the drying pipe, the lower ends of the wedge blocks are connected with the supporting plate in a sliding fit mode, reset springs are installed between the wedge blocks and the installation rod, the reset springs are located below the supporting plate, the outer wall of the supporting plate is connected with the inner wall of the drying pipe, the middle of the supporting plate is in sliding fit with the installation rod, mounting grooves are symmetrically formed in the front and back of the inner walls of the left end and the right end of the drying box, lifting rods are connected between the right and left mounting grooves in a sliding mode, linkage rods are installed between the two lifting rods which are distributed in the front and back mode, an electric push rod is installed at the upper end of the left end of one lifting rod and is fixedly installed in the mounting groove, and the lower ends of the lifting rods are connected with the installation rod, the outer wall of the lifting rod is connected with a discharging pipe in a sliding fit mode, the discharging pipe is distributed at equal intervals from left to right, the drying pipe is positioned inside the discharging pipe, the upper end of the discharging pipe is connected with the lower end of the screening box, a heater is input into the ventilating pipe through an external air pump, hot air flows enter each drying pipe through the communicating pipe and the branch pipe, the hot air flows can dry-mixed mortar production raw materials falling in the discharging pipe under the action of the ventilating holes, in the process, the lifting rod can be pushed downwards through the electric push rod, the lifting rod pushes the mounting rod downwards, the mounting rod drives the trapezoidal block to do synchronous descending motion, the trapezoidal block extrudes the wedge block, and under the action of the supporting disk, the wedge block does linear motion in the direction far away from the mounting rod, so that the gap between the wedge block and the ventilating hole is enlarged, when the electric push rod drives the lifting rod to reset, the gap between the wedge block and the ventilating hole is reduced, therefore, the effect of adjusting the sizes of the vent holes can be achieved, the flow rate of hot air flow can be controlled, the drying degree of the hot air flow on the dry-mixed mortar production raw materials can be controlled, the linkage rods can enable the two lifting rods to synchronously descend, and therefore all the sizes of the vent holes can be synchronously adjusted.
As a preferred technical scheme of the invention, the lower end of the screening box is uniformly provided with circular through grooves, a screening net is arranged in the circular through grooves, rectangular plates are symmetrically arranged at the left end and the right end of the screening box, a vibrating motor is arranged at the rear end of the screening box, a rectangular block is arranged below the rectangular plate, vibrating springs are symmetrically arranged between the rectangular plate and the rectangular block in a front-back mode, T-shaped rods are arranged at the lower ends of the rectangular blocks, one ends, close to the screening box, of the rectangular blocks and the T-shaped rods are connected with the side wall of the drying box, the lower ends of the T-shaped rods are connected with the upper end of the collecting box, the screening box can be in a vibrating state through the matching of the vibrating motor and the vibrating springs, and the situation that the screening net is blocked by dry-mixed mortar production raw materials to influence blanking is avoided.
As a preferred technical scheme of the invention, the bottom of the material collecting box is provided with a cavity, a heating net is arranged in the cavity, the front end of the material collecting box is provided with a box door through a hinge shaft, the heating net can carry out secondary drying on the raw material dried by hot air flow, the raw material can be thoroughly dried, and the box door can be convenient for discharging the raw material in the material collecting box without influencing the drying.
As a preferred technical scheme of the invention, mounting plates are symmetrically arranged in the material collecting box in a left-right mode, fixing rods are arranged at the inner side ends of the mounting plates which are right opposite to the left side, the fixing rods are equidistantly distributed from front to back, an arc plate is arranged at one end of each fixing rod, which is far away from the mounting plate, a scraper blade is arranged at one side of each arc plate, which is far away from the mounting plate, the scraper blade is connected with the corresponding fixing rod, rake teeth are uniformly arranged at the lower end of each arc plate, slide blocks are symmetrically arranged at the front end and the rear end of each mounting plate, an air cylinder is arranged at the upper end of each slide block at the rear end of the corresponding mounting plate, the air cylinder and the slide blocks are both positioned in a rectangular groove, the rectangular groove is formed in the inner wall of the material collecting box, a guide rod is connected to the middle of each slide block at the front end of the mounting plate in a sliding fit mode, the lower end of the guide rod is in sliding fit with the lower end of the rectangular groove, L-shaped plate is arranged at the upper end of the guide rod and the upper end of the air cylinder, the L-shaped plate is respectively in sliding fit mode, install reciprocal module between the positive relative L template of front and back, when this dry-mixed mortar production raw materials gets into the case that gathers materials through the drying cabinet inside, accessible scraper blade and reciprocal module cooperation, will pile up the raw materials and spread, make this dry-mixed mortar production raw materials tile in the bottom of the case that gathers materials, the circular arc board drives the rake teeth and makes a round trip to loose and overturn the raw materials of scraping, can increase the heated area of this raw materials in the case bottom that gathers materials and the space utilization who gathers materials the case, thereby can improve the drying rate to this raw materials and can once only collect as much raw materials as possible, at this in-process, the flexible slider that drives of accessible cylinder goes up and down, the slider drives the mounting panel, scraper blade and circular arc board do synchronous lift, change with the thickness of the inside accumulational raw materials of adaptation case that gathers materials.
As a preferred technical scheme of the invention, the discharging pipe consists of a straight cylinder pipe, a corrugated hose and a flared pipe, the straight cylinder pipe is fixedly arranged at the lower end of the screening box and communicated with the screening net, the corrugated hose is arranged at the lower end of the straight cylinder pipe, the flared pipe in an inclined state is arranged at the lower end of the corrugated hose, a cross rod is arranged on the outer wall of the right end of the straight cylinder pipe, a rotating shaft is rotatably connected between the front and back opposite cross rods, one end of the cross rod, far away from the straight cylinder pipe, is rotatably connected with an angle rod through the rotating shaft, one end of the angle rod, far away from the cross rod, is hinged to the outer wall of the flared pipe, the front end of the rotating shaft penetrates through the front end of the drying box and is provided with a first gear, a supporting plate is arranged below the first gear, the rear end of the supporting plate is connected with the outer wall of the drying box, the upper end of the supporting plate is slidably connected with a first rack, the upper end of the first rack is meshed with the lower end of the first gear, bellows combination of corrugated hose and tilt state, can slow down the falling speed of this dry-mixed mortar raw materials for production, increase the time that this raw materials is being arranged the inside detention of material pipe, thereby multiplicable hot air current dry's time, make the drying effect better, and through No. one rack of artifical mode pulling, No. one the rack drives all gear synchronous revolution, No. one the gear drives axis of rotation synchronous revolution, the axis of rotation drives the angle pole and does synchronous revolution, make the angle pole upwards carry and draw or promote the horn pipe downwards, can adjust the slope degree of horn pipe, thereby the falling speed of steerable this raw materials.
As a preferred technical scheme of the invention, the reciprocating module comprises a driving motor, a rotating shaft, a second gear and a second rack, the driving motor is fixedly arranged at the rear end of the material collecting box, the rotating shaft is arranged at the front end of the driving motor, the front end of the rotating shaft penetrates through the outer wall of the material collecting box and is provided with the second gear, the second gear is positioned in the rectangular groove, the upper end and the lower end of the second gear are symmetrically meshed with the second rack, the second racks are distributed in a staggered manner, and one end of the second rack, which is far away from the second gear, is connected with the L-shaped plate, the driving motor drives the second gear to rotate, the second gear drives the two second racks to do opposite or opposite linear motion, the second rack drives the L-shaped plate to do reciprocating linear motion, the L-shaped plate drives the mounting plate, the scraper plate, the arc plate and other structures to do synchronous linear reciprocating motion, therefore, the functions of circularly and repeatedly scraping and loosening the raw materials in the material collecting box can be realized.
According to a preferable technical scheme, a buckle is installed at the front end of the drying box, a groove is formed below the buckle, the groove is formed in the outer wall of the front end of the drying box, a brake plate is connected in the groove in a sliding mode, the depth of the brake plate is larger than that of the groove, a buckle ring is installed at the front end of the brake plate through a pin shaft, brake teeth are installed at the lower end of the brake plate and are meshed with the upper end of the first gear, extension springs are installed on the upper end of the brake plate in a bilateral symmetry mode, the upper ends of the extension springs are connected with the upper end of the groove, after the inclination angle of the horn tube is adjusted, the brake plate can be moved downwards to enable the brake teeth to be meshed with the second gear, the second gear can stop rotating in time, and when the brake plate moves upwards to be separated from the second gear, the brake plate can be fixed through matching between the buckle ring and the buckle, and accordingly the brake plate is prevented from falling.
As a preferable technical scheme of the invention, the screening box is internally provided with the baffle which is positioned between the screening nets which are distributed in the front and the back, and the baffle can prevent the dry-mixed mortar production raw materials from being accumulated between the screening nets and not falling from the screening box.
(II) advantageous effects
1. According to the invention, dry-mixed mortar production raw materials in the falling process can be dried through hot air flow, and the installation rod drives the trapezoidal block to lift, so that the trapezoidal block makes linear motion in the direction far away from or close to the installation rod, the effect of adjusting the size of the vent hole can be achieved, the flow rate of the hot air flow can be controlled, the drying degree of the hot air flow on the dry-mixed mortar production raw materials can be controlled, and the drying effect can be enhanced;
2. according to the invention, through the matching between the vibrating motor and the vibrating spring, the screening box can form a vibrating state, so that the influence on blanking caused by blocking of the screening net by dry-mixed mortar production raw materials is avoided;
3. in the process, the scraping plate, the arc plate and the reciprocating module are mutually matched, so that the dry-mixed mortar production raw material can be flatly paved at the bottom of the collecting box, the scraped raw material is loosened and overturned back and forth, the heating area of the raw material at the bottom of the collecting box and the space utilization rate of the collecting box are increased, and the drying rate of the raw material can be improved and the raw material as much as possible can be collected at one time;
4. the invention can slow down the falling speed of the raw materials for producing the dry-mixed mortar and increase the detention time of the raw materials in the discharging pipe through the combination of the corrugated hose and the inclined flared pipe, thereby increasing the hot airflow drying time and ensuring better drying effect;
5. the angle rod can lift the horn tube upwards or push the horn tube downwards through the mutual matching of the first rack, the first gear and the rotating shaft, and the inclination degree of the horn tube is adjusted, so that the falling speed of the raw material can be controlled.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a partial sectional view of the structure of the material collecting box of the present invention;
FIG. 4 is a front sectional view of a partial structure of the drying box of the present invention;
FIG. 5 is a side sectional view of a partial structure of the drying box of the present invention;
FIG. 6 is a top sectional view of a partial structure of the drying box of the present invention;
FIG. 7 is a top view of the present invention;
FIG. 8 is a side view of the present invention;
FIG. 9 is a perspective sectional view of a partial structure of a material collecting box and the like of the present invention;
FIG. 10 is a perspective view of a partial structure of a mounting plate or the like of the present invention;
FIG. 11 is an enlarged view of a portion of FIG. 4 at X in accordance with the present invention;
FIG. 12 is an enlarged view of a portion of the structure of FIG. 4 at Y in accordance with the present invention;
FIG. 13 is an enlarged view of a portion of the structure of FIG. 2 taken at Z in accordance with the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
As shown in fig. 1 to 13, the dry-mixed mortar production raw material drying and screening treatment system comprises a screening box 1, a collecting box 2 and a drying device 3, wherein the collecting box 2 is arranged right below the screening box 1, the lower end of the collecting box 2 is connected with the existing ground, and the drying device 3 is arranged between the upper end of the collecting box 2 and the lower end of the screening box 1.
The screening box is characterized in that a circular through groove is uniformly formed in the lower end of the screening box 1, a screening net 11 is installed in the circular through groove, a vibration motor 12 is installed at the rear end of the screening box 1, rectangular plates 13 are symmetrically installed at the left end and the right end of the screening box 1, rectangular blocks 14 are arranged below the rectangular plates 13, vibration springs 15 are symmetrically installed between the rectangular plates 13 and the rectangular blocks 14 in a front-back mode, T-shaped rods 16 are installed at the lower ends of the rectangular blocks 14, one ends, close to the screening box 1, of the rectangular blocks 14 and the T-shaped rods 16 are connected with the side wall of the drying box 30, the lower ends of the T-shaped rods 16 are connected with the upper end of the collecting box 2, baffles 17 are installed inside the screening box 1 and located between the screening nets 11 which are distributed in the front-back mode, the screening box 1 can be in a vibration state through the matching between the vibration motor 12 and the vibration springs 15, and therefore the situation that the screening nets 11 are blocked by dry-mixed mortar production raw materials to influence blanking is avoided, the baffle 17 can prevent the dry-mixed mortar production raw materials from being accumulated between the screening nets 11 and not falling from the screening box 1.
The bottom of the material collecting box 2 is provided with a cavity, a heating net 20 is arranged in the cavity, the front end of the material collecting box 2 is provided with a box door through a hinge shaft, the box door can facilitate the emission of raw materials in the material collecting box 2 without affecting drying, the inside of the material collecting box 2 is symmetrically provided with mounting plates 21 from left to right, fixing rods 22 are arranged at the inner side ends of the mounting plates 21 which are right opposite to left and right, the fixing rods 22 are equidistantly distributed from front to back, an arc plate 23 is arranged at one end of each fixing rod 22 far away from the mounting plate 21, a scraper 24 is arranged at one side of each arc plate 23 far away from the mounting plate 21, the scraper 24 is connected with the fixing rods 22, rake teeth 25 are uniformly arranged at the lower end of each arc plate 23, sliders 26 are symmetrically arranged at the front end and the rear end of each mounting plate 21, an air cylinder 27 is arranged at the upper end of each slider 26 at the rear end of each mounting plate 21, the air cylinders 27 and the sliders 26 are both positioned in rectangular grooves, the inner walls of the material collecting box 2 are arranged in the rectangular grooves, the middle part of a sliding block 26 at the front end of the mounting plate 21 is connected with a guide rod 28 in a sliding fit mode, the lower end of the guide rod 28 is in sliding fit with the lower end of the rectangular groove, the upper ends of the guide rod 28 and the cylinder 27 are both provided with an L-shaped plate 29, the upper end and the lower end of the L-shaped plate 29 are respectively in sliding connection with the upper end and the lower end of the rectangular groove, a reciprocating module 290 is arranged between the front L-shaped plate 29 and the rear L-shaped plate 29 which are opposite, a heating net 20 can carry out secondary drying on the raw materials dried by hot air flow, the raw materials can be completely dried, when the dry-mixed mortar production raw materials enter the collecting box 2 through the drying box 30, the stacked raw materials can be spread through the matching of a scraping plate 24 and the reciprocating module 290, the dry-mixed mortar production raw materials are flatly paved at the bottom of the collecting box 2, meanwhile, the arc plate 23 drives a rake teeth 25 to loosen and turn over the scraped raw materials, the heating area of the bottom of the collecting box 2 and the space utilization rate of the collecting box 2 can be increased, thereby can improve the drying rate to this raw materials and can once only collect as much raw materials as possible, at this in-process, the flexible slider 26 that drives of accessible cylinder 27 goes up and down, and slider 26 drives mounting panel 21, scraper blade 24 and circular arc board 23 and does synchronous lift to the thickness change of the inside accumulational raw materials of adaptation case 2 that gathers materials.
The reciprocating module 290 comprises a driving motor 291, a rotating shaft 292, a second gear 293 and a second rack 294, the driving motor 291 is fixedly arranged at the rear end of the material collecting box 2, the rotating shaft 292 is arranged at the front end of the driving motor 291, the front end of the rotating shaft 292 penetrates through the outer wall of the material collecting box 2 and is provided with the second gear 293, the second gear 293 is positioned in the rectangular groove, the second rack 294 is symmetrically engaged at the upper end and the lower end of the second gear 293, the second racks 294 are distributed in a staggered manner, and one end, far away from the second gear 293, of the second rack 294 is connected with the L-shaped plate 29, the driving motor 291 drives the second gear 293 to rotate, the second gear 293 drives the two second racks 294 to do opposite or opposite linear motion, the second rack 294 drives the L-shaped plate 29 to do reciprocating linear motion, the L-shaped plate 29 drives the mounting plate 21, the scraper 24, the arc plate 23 and other structures to do synchronous linear reciprocating motion, so that the functions of circularly and repeatedly scraping and loosening the raw materials in the material collecting box 2 can be realized.
The drying device 3 comprises a drying box 30, vent pipes 31, communicating pipes 32, branch pipes 33, a drying pipe 34, vent holes 35, mounting rods 36, a trapezoidal block 37, a wedge block 38, a supporting plate 39, a lifting rod 3a, a linkage rod 3b, an electric push rod 3c and a discharging pipe 3d, wherein the drying box 30 is arranged under the screening box 1, the vent pipes 31 are arranged in the drying box 30, the vent pipes 31 are distributed in the front and back direction, one end of one vent pipe 31 penetrates through the side wall of the drying box 30, the communicating pipe 32 is arranged between the two vent pipes 31, the branch pipes 33 are arranged at equal intervals from left to right at the upper ends of the two vent pipes 31, the drying pipe 34 is arranged at the upper end of the branch pipe 33, the drying pipe 34 is composed of a straight pipe and an inclined pipe, the vent holes 35 are uniformly arranged on the outer wall of the drying pipe 34 from top to bottom along the circumferential direction, the upper end of the drying pipe 34 is provided with a perforation, the mounting rods 36 are connected in the perforation in a sliding manner, the lower end of the installation rod 36 is positioned in the drying pipe 34, the outer wall of the installation rod 36 is provided with trapezoidal blocks 37 at equal intervals from top to bottom, the trapezoidal blocks 37 are uniformly distributed along the circumference of the installation rod 36, the inclined surface of the trapezoidal blocks 37 is in sliding fit with the wedge blocks 38, the height of the wedge blocks 38 is gradually increased from inside to outside, one end of each wedge block 38, far away from the installation rod 36, is positioned in the vent hole 35 of the straight pipe part of the drying pipe 34, the lower end of each wedge block 38 is connected with the support disc 39 in a sliding fit manner, a return spring is arranged between each wedge block 38 and the installation rod 36 and is positioned below the support disc 39, the outer wall of the support disc 39 is connected with the inner wall of the drying pipe 34, the middle part of the support disc 39 is in sliding fit with the installation rod 36, the inner walls at the left end and the right end of the drying box 30 are respectively provided with front and back symmetrical installation grooves, and left and right opposite installation grooves are connected with the lifting rod 3a in a sliding manner, a linkage rod 3b is arranged between two lifting rods 3a which are distributed in the front-back direction, an electric push rod 3c is arranged at the upper end of the left end of one lifting rod 3a, the electric push rod 3c is fixedly arranged in the mounting groove, the lower end of the lifting rod 3a is connected with a mounting rod 36, the outer wall of the lifting rod 3a is connected with a discharging pipe 3d in a sliding fit mode, the discharging pipe 3d is distributed at equal intervals from left to right, a drying pipe 34 is positioned in the discharging pipe 3d, the upper end of the discharging pipe 3d is connected with the lower end of the sieving box 1, the discharging pipe 3d is composed of a straight cylinder pipe 3d1, a corrugated hose 3d2 and a horn pipe 3d3, a straight cylinder pipe 3d1 is fixedly arranged at the lower end of the sieving box 1 and communicated with the sieving net 11, a corrugated hose 3d2 is arranged at the lower end of the straight cylinder pipe 3d1, a horn pipe 3d3 in an inclined state is arranged at the lower end of the corrugated hose 3d2, and a cross rod 3d4 is arranged at the outer wall of the right end of the straight cylinder 3d1, a rotating shaft 3d5 is rotatably connected between the front and rear right opposite cross bars 3d4, one end of the cross bar 3d4, which is far away from the straight cylinder 3d1, is rotatably connected with an angle bar 3d6 through a rotating shaft 3d5, one end of the angle bar 3d6, which is far away from the cross bar 3d4, is hinged with the outer wall of the flared tube 3d3, the front end of the rotating shaft 3d5 penetrates through the front end of the drying box 30 and is provided with a first gear 3d7, a support plate 3d8 is arranged below the first gear 3d7, the rear end of the support plate 3d8 is connected with the outer wall of the drying box 30, the upper end of the support plate 3d8 is slidably connected with a first rack 3d9, the upper end of the first rack 3d9 is meshed with the lower end of the first gear 3d7, a heating air pump is input into the ventilating tube 31 through an external air pump, the communicating tube 32 enters into each drying tube 34, and dry-mixing raw materials in the hot air flow in the falling mortar production in the drying tube 3d under the action of the ventilating hole 35, in the process, the lifting rod 3a can be pushed downwards through the electric push rod 3c, the lifting rod 3a pushes the mounting rod 36 downwards, the mounting rod 36 drives the trapezoidal block 37 to do synchronous descending motion, the trapezoidal block 37 extrudes the wedge-shaped block 38, under the action of the supporting plate 39, the wedge-shaped block 38 makes linear motion in the direction far away from the mounting rod 36, so that the gap between the wedge-shaped block 38 and the vent hole 35 is increased, when the electric push rod 3c drives the lifting rod 3a to reset, the gap between the wedge-shaped block 38 and the vent hole 35 is decreased, so that the effect of adjusting the size of the vent hole 35 can be achieved, the flow rate of hot air flow is controlled, the drying degree of the hot air flow on the dry-mixed mortar production raw material can be controlled, the linkage rod 3b can make the two lifting rods 3a do synchronous descending motion, and the sizes of all the vent holes 35 can be adjusted synchronously; the combination of the corrugated hose 3d2 and the inclined flared tube 3d3 can slow down the falling speed of the raw material for producing the dry-mixed mortar, increase the retention time of the raw material in the discharging tube 3d, thereby increasing the hot airflow drying time, and further achieving better drying effect, and the first rack 3d9 is pulled manually, the first rack 3d9 drives all the first gears 3d7 to synchronously rotate, the first gear 3d7 drives the rotating shaft 3d5 to synchronously rotate, the rotating shaft 3d5 drives the angle rod 3d6 to synchronously rotate, so that the angle rod 3d6 lifts or pushes the flared tube 3d3 upwards, the inclination degree of the flared tube 3d3 can be adjusted, and the falling speed of the raw material can be controlled.
The front end of the drying box 30 is provided with a buckle 301, a groove 302 is arranged below the buckle 301, the groove 302 is arranged on the outer wall of the front end of the drying box 30, a brake plate 303 is connected in the groove 302 in a sliding manner, the depth of the brake plate 303 is greater than that of the groove 302, the front end of the brake plate 303 is provided with a retaining ring 304 through a pin shaft, the lower end of the brake plate 303 is provided with a brake tooth 305, the brake tooth 305 is meshed with the upper end of a second gear 293, the upper end of the brake plate 303 is provided with stretching springs 306 in a left-right symmetry manner, the upper ends of the stretching springs 306 are connected with the upper end of the groove 302, after the inclination angle of a horn tube 3d3 is adjusted, the brake plate 303 can be moved downwards to enable the brake tooth 305 to be meshed with a first gear 3d7, the second gear 293 can be stopped to rotate in time, when the brake plate 303 moves upwards to be separated from the second gear 293, the brake plate 303 can be fixed through the cooperation between the retaining ring 304 and the buckle 301, so as not to drop the braking plate 303.
When the dry-mixed mortar drying device works, firstly, a heater is input into the ventilating pipe 31 through the external air pump, then production raw materials of the dry-mixed mortar are poured into the screening box 1, the vibration motor 12 is started, the vibration motor 12 is matched with the vibration spring 15, the screening box 1 is in a vibration state, so that the screening net 11 is prevented from being blocked by sand and stones to influence blanking, hot air generated by the external air pump can dry the raw materials in the falling process of the production raw materials, in the process, the lifting rod 3a can be pushed downwards through the electric push rod 3c, the mounting rod 36 is pushed downwards through the lifting rod 3a, the mounting rod 36 drives the trapezoidal block 37 to synchronously descend, the trapezoidal block 38 is extruded by the trapezoidal block 37, under the action of the supporting plate 39, the wedge block 38 linearly moves towards the direction far away from the mounting rod 36, so that the gap between the wedge block 38 and the ventilating hole 35 is enlarged, and when the lifting rod 3a is driven by the electric push rod 3c to reset, the gap between the wedge-shaped block 38 and the vent hole 35 is reduced, so that the effect of adjusting the size of the vent hole 35 can be achieved, the flow rate of hot air flow can be controlled, and the drying degree of the hot air flow on the dry-mixed mortar production raw material can be controlled;
when the dry-mixed mortar production raw material enters the material collecting box 2 through the drying box 30 and is accumulated at the bottom of the material collecting box 2, the raw material can be dried for the second time through the heating net 20, in the process, the accumulated raw material can be spread through the matching of the scraper 24 and the reciprocating module 290, so that the dry-mixed mortar production raw material is flatly spread at the bottom of the material collecting box 2, meanwhile, the arc plate 23 drives the rake teeth 25 to loosen and turn over the scraped raw material back and forth, the heating area of the raw material at the bottom of the material collecting box 2 and the space utilization rate of the material collecting box 2 can be increased, the drying rate of the raw material can be increased, and the raw material as much as possible can be collected at one time, when the raw material with a certain thickness is accumulated at the bottom of the material collecting box 2, the sliding block 26 is driven to ascend through the expansion of the air cylinder 27, the sliding block 26 drives the mounting plate 21, the scraper 24 and the arc plate 23 to do synchronous ascending motion, so as to adapt to the thickness change of the raw materials accumulated in the material collecting box 2, and finally, the box door of the material collecting box 2 is opened to collect the completely dried raw materials.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a dry-mixed mortar raw materials for production drying screening processing system, includes sieve workbin (1), collection workbin (2) and drying device (3), its characterized in that: a material collecting box (2) is arranged right below the screening box (1), the lower end of the material collecting box (2) is connected with the existing ground, and a drying device (3) is arranged between the upper end of the material collecting box (2) and the lower end of the screening box (1);
the drying device (3) comprises a drying box (30), vent pipes (31), communicating pipes (32), branch pipes (33), drying pipes (34), vent holes (35), an installation rod (36), a trapezoidal block (37), a wedge block (38), a support plate (39), a lifting rod (3a), a linkage rod (3b), an electric push rod (3c) and a discharge pipe (3d), wherein the drying box (30) is arranged under the screening box (1), the vent pipes (31) are installed inside the drying box (30), the vent pipes (31) are distributed front and back, one end of one vent pipe (31) penetrates through the side wall of the drying box (30), the communicating pipes (32) are installed between the two vent pipes (31), the branch pipes (33) are installed at equal intervals from left to right at the upper ends of the two vent pipes (31), the drying pipes (34) are installed at the upper ends of the branch pipes (33), and the drying pipes (34) are composed of straight pipes and inclined pipes, the straight tube is located the upper end of the inclined tube, the outer wall of the drying tube (34) is from top to bottom and evenly provided with vent holes (35) along the circumference, the upper end of the drying tube (34) is provided with a perforation, a mounting rod (36) is connected in the perforation in a sliding manner, the lower end of the mounting rod (36) is located inside the drying tube (34), the outer wall of the mounting rod (36) is provided with trapezoidal blocks (37) from top to bottom at equal intervals, the trapezoidal blocks (37) are evenly distributed along the circumference of the mounting rod (36), the inclined planes of the trapezoidal blocks (37) are in sliding fit with the wedge blocks (38), one ends of the wedge blocks (38) far away from the mounting rod (36) are located in the vent holes (35) of the straight tube part of the drying tube (34), the lower ends of the wedge blocks (38) are connected with the supporting disc (39) in a sliding fit manner, and reset springs are arranged between the wedge blocks (38) and the mounting rod (36), the reset springs are located below the supporting disc (39), the outer wall of the supporting disk (39) is connected with the inner wall of the drying tube (34), the middle part of the supporting disk (39) is in sliding fit with the mounting rod (36), the inner walls of the left end and the right end of the drying box (30) are symmetrically provided with mounting grooves in the front and back direction, the lifting rod (3a) is connected between the right mounting groove and the left mounting groove in a sliding way, a linkage rod (3b) is arranged between the two lifting rods (3a) which are distributed in the front and back direction, the upper end of the left end of one lifting rod (3a) is provided with an electric push rod (3c), the electric push rod (3c) is fixedly arranged in the mounting groove, and the lower extreme of lifter (3a) links to each other with installation pole (36), and the outer wall of lifter (3a) is connected with row material pipe (3d) through sliding fit mode, arranges material pipe (3d) and distributes from a left side to the right equidistant, and drying tube (34) are located the inside of arranging material pipe (3d), and the upper end of arranging material pipe (3d) links to each other with the lower extreme of sieve workbin (1).
2. The dry-mixed mortar production raw material drying and screening treatment system according to claim 1, characterized in that: the lower extreme of sieve workbin (1) evenly seted up circular logical groove, circular logical inslot is installed and is sieved net (11), vibrating motor (12) are installed to the rear end of sieve workbin (1), and sieve workbin (1) about both ends symmetry install rectangular plate (13), the below of rectangular plate (13) is provided with rectangular block (14), vibrating spring (15) are installed to the symmetry around between rectangular plate (13) and rectangular block (14), T type pole (16) are installed to the lower extreme of rectangular block (14), rectangular block (14) all link to each other with the lateral wall of drying cabinet (30) with the one end that T type pole (16) are close to sieve workbin (1), the lower extreme of T type pole (16) links to each other with the upper end of collection workbin (2).
3. The dry-mixed mortar production raw material drying and screening treatment system according to claim 1, characterized in that: the bottom of the material collecting box (2) is provided with a cavity, a heating net (20) is arranged in the cavity, and the front end of the material collecting box (2) is provided with a box door through a hinge shaft.
4. The dry-mixed mortar production raw material drying and screening treatment system as claimed in claim 1, characterized in that: the inside bilateral symmetry of case (2) that gathers materials be provided with mounting panel (21), dead lever (22) are all installed to the medial extremity of controlling just relative mounting panel (21), dead lever (22) are in the past distributed backward equidistance, arc board (23) are installed to the one end that mounting panel (21) were kept away from in dead lever (22), one side that mounting panel (21) were kept away from in arc board (23) is provided with scraper blade (24), scraper blade (24) link to each other with dead lever (22), rake teeth (25) are evenly installed to the lower extreme of arc board (23), slider (26) are installed to both ends symmetry around mounting panel (21), cylinder (27) are installed to the upper end of slider (26) of mounting panel (21) rear end, cylinder (27) and slider (26) all are located the rectangular channel, the inner wall in case (2) is gathered materials is seted up in the rectangular channel, slider (26) the middle part of mounting panel (21) front end is connected with guide bar (28) through sliding fit, sliding fit is between the lower extreme of guide bar (28) and the lower extreme of rectangular channel, and L template (29) are all installed to the upper end of guide bar (28) and cylinder (27), the upper end and the lower extreme of L template (29) respectively with the upper and lower both ends sliding connection of rectangular channel, install reciprocal module (290) between the just relative L template (29) in front and back.
5. The dry-mixed mortar production raw material drying and screening treatment system according to claim 1, characterized in that: the material discharging pipe (3d) consists of a straight cylinder pipe (3d1), a corrugated hose (3d2) and a flared pipe (3d3), the straight cylinder pipe (3d1) is fixedly arranged at the lower end of the screening box (1) and is communicated with the screening net (11), the corrugated hose (3d2) is arranged at the lower end of the straight cylinder pipe (3d1), the flared pipe (3d3) in an inclined state is arranged at the lower end of the corrugated hose (3d2), a cross rod (3d4) is arranged on the outer wall of the right end of the straight cylinder pipe (3d1), a rotating shaft (3d5) is rotatably connected between the front cross rod and the rear cross rod (3d4) which are opposite, one end, far away from the straight cylinder pipe (3d1), of the cross rod (3d4 d6) is rotatably connected with an angle rod (3d6) through the rotating shaft (3d5), one end, far away from the cross rod (3d4), is hinged to the outer wall of the flared pipe (3d3), and the front end 7) of the drying box (5) is provided with a front gear (7), a supporting plate (3d8) is arranged below the first gear (3d7), the rear end of the supporting plate (3d8) is connected with the outer wall of the drying box (30), a first rack (3d9) is connected to the upper end of the supporting plate (3d8) in a sliding mode, and the upper end of the first rack (3d9) is meshed with the lower end of the first gear (3d 7).
6. The dry-mixed mortar production raw material drying and screening treatment system according to claim 4, characterized in that: reciprocating module (290) including driving motor (291), pivot (292), No. two gear (293) and No. two racks (294), driving motor (291) fixed mounting is in the rear end of gathering together workbin (2), pivot (292) are installed to the front end of driving motor (291), the front end of pivot (292) runs through the outer wall of gathering together workbin (2) and installs No. two gear (293), No. two gear (293) are located the rectangular channel, the upper and lower both ends symmetric meshing of No. two gear (293) has No. two racks (294), No. two racks (294) staggered distribution, and No. two rack (294) keep away from the one end of No. two gear (293) and link to each other with L template (29).
7. The dry-mixed mortar production raw material drying and screening treatment system according to claim 5, characterized in that: buckle (301) are installed to the front end of drying cabinet (30), the below of buckle (301) is provided with recess (302), the front end outer wall of drying cabinet (30) is seted up in recess (302), sliding connection has braking plate (303) in recess (302), buckle (304) are installed through the round pin axle to the front end of braking plate (303), braking tooth (305) are installed to the lower extreme of braking plate (303), the upper end meshing of braking tooth (305) and a gear (3d7), extension spring (306) are installed to the upper end bilateral symmetry of braking plate (303), the upper end of extension spring (306) links to each other with the upper end of recess (302).
8. The dry-mixed mortar production raw material drying and screening treatment system according to claim 1, characterized in that: the screening box (1) internally mounted have baffle (17), baffle (17) are located between the screening net (11) that distribute around.
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| CN202110599644.7A CN113280615B (en) | 2021-05-31 | 2021-05-31 | Dry-mixed mortar production raw material drying and screening treatment system |
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| CN202110599644.7A CN113280615B (en) | 2021-05-31 | 2021-05-31 | Dry-mixed mortar production raw material drying and screening treatment system |
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| CN115611289A (en) * | 2022-08-15 | 2023-01-17 | 芜湖飞尚非金属材料有限公司 | Comprehensive utilization method of low-grade bentonite raw ore |
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| US5893217A (en) * | 1997-10-28 | 1999-04-13 | Cat-Tec Industries, Inc. | Agitated bed infrared drying apparatus |
| US6189234B1 (en) * | 1998-04-08 | 2001-02-20 | International Technology Systems, Inc. | Continuous flow fluid bed dryer |
| CN201086620Y (en) * | 2007-08-07 | 2008-07-16 | 华南理工大学 | Air quantity control device of ventilation pipe of passenger car |
| ITVR20080024A1 (en) * | 2008-02-18 | 2009-08-19 | Moretto Spa | HOPPER STRUCTURE |
| CN201291515Y (en) * | 2008-10-09 | 2009-08-19 | 江苏省建筑工程集团有限公司 | Dry-mixed mortar production equipment |
| CN202582095U (en) * | 2012-04-23 | 2012-12-05 | 上海申嘉三和环保科技开发有限公司 | Vertical water extractor |
| CN205027092U (en) * | 2015-09-25 | 2016-02-10 | 四川省百草生物药业有限公司 | Drug drying device |
| CN108759346B (en) * | 2018-07-23 | 2020-04-17 | 江苏远华轻化装备有限公司 | Oven with uniform air guide system |
| CN109675783A (en) * | 2018-12-24 | 2019-04-26 | 合肥麦稻之星机械有限公司 | A kind of Cirulation type grain dryer |
| CN209763703U (en) * | 2019-04-03 | 2019-12-10 | 贵阳宏基建材有限公司 | pulverized coal drying device for dry-mixed mortar production |
| CN211012348U (en) * | 2019-06-20 | 2020-07-14 | 泉州市广进源智能设备有限公司 | Cereal drying device for agricultural equipment |
| CN210242326U (en) * | 2019-06-20 | 2020-04-03 | 盐城迈克瑞机械有限公司 | High-frequency electromagnetic induction hot blast stove for grain drying |
| CN211651137U (en) * | 2019-10-30 | 2020-10-09 | 刘海欧 | Drying device for plastic production |
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| CN111578675A (en) * | 2020-05-06 | 2020-08-25 | 安徽科林新材料科技有限公司 | Drying device for shaving board production and processing |
| CN111692871A (en) * | 2020-06-27 | 2020-09-22 | 李凯 | Cosmetics powder dispersion drying device |
| CN111854405A (en) * | 2020-07-31 | 2020-10-30 | 赣州虔沿达科技有限公司 | Seed drying device for agricultural science research |
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