CN113798190A - Needle sheet-shaped aggregate screening device for ultrahigh pumping concrete - Google Patents
Needle sheet-shaped aggregate screening device for ultrahigh pumping concrete Download PDFInfo
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- CN113798190A CN113798190A CN202111082182.8A CN202111082182A CN113798190A CN 113798190 A CN113798190 A CN 113798190A CN 202111082182 A CN202111082182 A CN 202111082182A CN 113798190 A CN113798190 A CN 113798190A
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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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/16—Feed or discharge arrangements
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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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
-
- 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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/18—Control
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- 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
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- Combined Means For Separation Of Solids (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to concrete manufacturing, in particular to a needle sheet-shaped aggregate screening device for ultrahigh pumping concrete, which comprises a bracket, an outer fixed platform fixed on the bracket, an inner rotating platform arranged on the bracket, and a bone hopper fixed above the inner rotating platform, wherein the bone hopper is fixed on the outer fixed platform through a supporting bracket; a gap for the needle sheet-shaped aggregate to pass through is reserved between the outer fixed table and the inner rotary table; the inner rotating table is provided with at least one shifting strip, and the shifting strip is positioned between the outer fixing table and the gap on the upper surface of the inner rotating table; the inner rotary table is provided with a rotating shaft, the rotating shaft is fixed on the support, and the rotating shaft is provided with a driving part. The invention can quickly screen needle-shaped aggregate, greatly improves the screening efficiency compared with manual screening, and simultaneously prevents the aggregate from being clamped between the outer fixed table and the inner rotary table by the shifting strip arranged on the inner rotary table, thereby not only ensuring the continuity of the screening process, but also ensuring the screening effect of the whole device.
Description
Technical Field
The invention relates to concrete manufacturing, in particular to a needle sheet-shaped aggregate screening device for ultrahigh pumping concrete.
Background
The needle-flake aggregate is a particle in which the ratio of the size of the aggregate particle in the minimum thickness (or diameter) direction to the maximum length (or width) direction is less than 0.4. The content of the needle-shaped aggregate is used as an important index for evaluating the quality of the aggregate, the performance of the concrete is influenced, and the needle-shaped aggregate influences the fluidity of the concrete and simultaneously influences the combination of stones, sand, cementing materials and the like. In order to detect the content of the needle-shaped aggregate of the aggregate, the needle-shaped aggregate needs to be screened out for evaluating whether the quality of the aggregate meets the quality requirement.
The current methods for detecting the shape of the needle sheet are as follows: the method is characterized in that a gauge method and a vernier caliper method are adopted, but the two methods are very low in efficiency, only one aggregate can be measured at a time, and the screening method is simple, but the workload is large, so that the efficiency of screening the needle-shaped aggregates is low, and the detection of the needle-shaped aggregates is very unfavorable. Therefore, it is necessary to provide a new screening device for needle-shaped aggregates.
Disclosure of Invention
The invention aims to provide a needle sheet aggregate screening device for ultra-high pumping concrete, which aims to solve the problem that the needle sheet aggregate screening efficiency is low due to large workload although the screening is simple in the conventional needle sheet aggregate screening.
In order to solve the technical problems, the needle sheet-shaped aggregate screening device for the ultra-high pumping concrete, which is adopted by the invention, has the technical means as follows: the bone hopper is fixed on the outer fixed table through a support bracket; the upper surface of the outer fixed table is higher than the upper surface of the inner rotary table, and a gap for needle sheet aggregate to pass through is reserved between the outer fixed table and the inner rotary table; the inner rotating table is provided with at least one shifting strip, and the shifting strip is positioned between the outer fixing table and the gap on the upper surface of the inner rotating table; the inner rotary table is provided with a rotating shaft, the rotating shaft is fixed on the support, and the rotating shaft is provided with a driving part.
The needle-shaped aggregate screening device for the ultra-high pumping concrete has the following technical advantages: according to the screening device, the screening of needle sheet aggregate is realized through the gap between the outer fixed table and the inner rotary table and the height difference between the outer fixed table and the inner rotary table, and the non-needle sheet aggregate falls onto the inner rotary table from the aggregate hopper, is uniformly distributed and is thrown to the gap between the outer fixed table and the inner rotary table through the rotating action of the inner rotary table; when the non-needle sheet-shaped aggregate slides to the junction of the gap between the outer fixed table and the inner rotary table under the rotating action of the inner rotary table, the height difference between the outer fixed table and the inner rotary table is lower relative to the non-needle sheet-shaped aggregate, so that the non-needle sheet-shaped aggregate with the movement tendency cannot be limited and blocked, and the non-needle sheet-shaped aggregate can roll through the outer fixed table and leave the inner rotary table; the needle-shaped aggregate can be blocked by the outer fixed platform, and the needle-shaped aggregate blocked by the outer fixed platform can enter a gap between the outer fixed platform and the inner rotary platform under the action of the inner rotary platform (providing centrifugal force) and the outer fixed platform (guiding), and leaves the inner rotary platform through the gap; when a part of the non-needle sheet-shaped aggregate is blocked by the outer fixing plate, the non-needle sheet-shaped aggregate can continuously roll under the action of the inner rotating platform until the non-needle sheet-shaped aggregate rolls out of the outer fixing platform at the back; when aggregates are clamped between the outer fixed table and the inner rotating table, a part of the aggregates can be brought into a gap between the outer fixed table and the inner rotating table under the rotating action of the inner rotating table (the gap is smaller at an inlet and the gap width is larger inwards), and a part of the aggregates can be continuously clamped in the gap; the invention can quickly screen needle-shaped aggregates, greatly improves the screening efficiency compared with manual screening, can prevent the aggregates from being clamped between the outer fixed table and the inner rotary table by the aid of the shifting strips arranged on the inner rotary table, can ensure the continuity of the screening process and the screening effect of the whole device, and ensures that the aggregates are uniformly distributed under the action of the inner rotary table in the whole screening process and the screening effect is good.
As a preferred scheme, the bone hopper is also provided with a feeding control rod and a bone hopper bracket for fixing the feeding control rod, the lower end of the feeding control rod is provided with a circular table column piston, and the circular table column piston seals the bone hopper in a normal state; the flow control rod is provided with an external thread, and the bone hopper support is provided with an internal thread; the feeding control rod is in threaded fit with the bone hopper support, and the lifting of the feeding control rod is used for realizing the clearance adjustment between the circular truncated cone column piston and the bone hopper, so that the falling flow of aggregate in the bone hopper is controlled.
Preferably, at least one arc-shaped shifting piece is arranged on the inner rotating table, and the protruding direction of the arc-shaped shifting piece is the same as the rotating direction of the inner rotating table; the arc plectrum can be with the aggregate that falls in the bone hopper, and rotatory dial between outside fixed station and the interior revolving stage, be favorable to screening needle slice form aggregate, and the protruding direction of arc plectrum is the same with the direction of rotation of interior revolving stage, is favorable to leading the rotatory dial of aggregate to between outside fixed station and the interior revolving stage, makes aggregate evenly distributed make the aggregate obtain effective screening around.
As a preferred scheme, at least one sliding chute is arranged on the inner rotating table, and the sliding chute is overlapped with the tangential direction of the inner rotating table; the spout can be with the outer baffle of aggregate direction after the screening, in time will not follow the outer baffle of aggregate direction and collect that falls down between external fixation platform and the interior revolving stage, can also prevent that the aggregate from gathering the heap, influences the screening of aggregate at the back.
As a preferable scheme, the outer fixing plate is circumferentially provided with an outer baffle, and the cross section of the outer baffle is U-shaped; the outer baffle is provided with a discharge pipe, and an outer collecting tank is correspondingly arranged below the discharge pipe; aggregate can be collected to the outer baffle of "U" shape cross-section, prevents the aggregate departure simultaneously, and the aggregate that lies in simultaneously on the outer baffle can be convenient shifts through arranging the material pipe, collects through outer collecting vat.
As a preferable scheme, a circumferential inner baffle plate is further arranged below the outer fixing plate, a collecting hopper is arranged below the inner rotary table, and an inner collecting groove is arranged below the collecting hopper; the baffle can prevent that the aggregate from transversely flying out to with the aggregate direction collection hopper, the cooperation is collected the hopper below and is equipped with the interior collection groove and be convenient for collect and sieve out needle slice aggregate.
Preferably, the height difference between the upper surface of the outer fixed table and the upper surface of the inner rotating table is 0.1-0.5 times of the average diameter of the aggregates, and the height difference between the upper surfaces of the outer fixed table and the inner rotating table is smaller than the average diameter of the screened aggregates.
Preferably, the width of the gap between the outer fixed table and the inner rotary table is gradually increased from the inlet; the clearance that increases gradually not only can sieve the aggregate, makes the needle sheet form aggregate that sieves out simultaneously can not block in the clearance between outer fixed station and the interior revolving stage, makes aggregate screening process go on smoothly.
Preferably, the driving part comprises a motor, a driving pulley mounted on the motor, a driven pulley mounted on the rotating shaft, and a belt connecting the driving pulley and the driven pulley, and the motor is fixed on the bracket.
Drawings
FIG. 1 is a schematic overall view of the present invention;
FIG. 2 is a schematic overall view of another aspect of the present invention;
FIG. 3 is a front view of the present invention as a whole;
FIG. 4 is a sectional view A-A in a front view of the present invention;
FIG. 5 is a partial schematic external view of the present invention;
FIG. 6 is a first schematic view of the bone hopper of the present invention;
FIG. 7 is a second schematic view of the bone hopper of the present invention;
FIG. 8 is a first functional diagram of the present invention;
fig. 9 is a second functional diagram of the present invention.
The main part symbols in the figures are explained as follows:
1. a support; 2. an inner rotating platform; 3. an outer fixed table; 4. a rotating shaft; 5. a bone hopper; 6. an outer baffle; 7. an inner baffle; 8. A collecting hopper; 9. a driving portion; 10. a discharge pipe; 11. an outer collection tank; 12. an inner collection trough; 13. an arc-shaped poking sheet; 14. Dialing a strip; 15. a chute.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the needle-shaped aggregate screening device for ultra-high pumping concrete comprises a bracket 1, an outer fixed platform 3 fixed on the bracket, an inner rotating platform 2 installed on the bracket, and a bone hopper 5 fixed above the inner rotating platform 2, wherein the bone hopper 5 is fixed on the outer fixed platform 3 through a support bracket;
as shown in fig. 3 and 4, the upper surface of the outer fixed table 3 is higher than the upper surface of the inner rotary table 2, the height difference between the upper surfaces of the outer fixed table 3 and the inner rotary table 2 is smaller than the average diameter of the screened aggregate, and the height difference between the upper surface of the outer fixed table 3 and the upper surface of the inner rotary table 2 is 0.1-0.5 times of the average diameter of the aggregate; the upper surface of the inner rotating platform 2 is a conical surface, the circumferential edge of the upper surface of the inner rotating platform 2 is subjected to right angle guiding treatment, the sectional area of the outer fixing platform 3 is inverted 'L' -shaped, the transverse section of the 'L' -shaped is inward, a gap for needle sheet aggregate to pass through is reserved between the outer fixing platform 3 and the inner rotating platform 2, the width of the gap between the outer fixing platform 3 and the inner rotating platform 2 is gradually increased from an inlet, and the screened needle sheet aggregate can be prevented from being clamped in the gap.
The inner rotating platform 2 is provided with at least one shifting strip 14, the shifting strips 14 are positioned between the outer fixing platform 3 and the upper surface of the inner rotating platform 2, the shifting strips 14 are fin-shaped, the inclined surfaces of the shifting strips 14 face to the rotating direction of the inner rotating platform, preferably 8 shifting strips 14 are arranged, and the inner rotating platform 14 is fixed in a circumferential array; the inner rotating platform 2 is provided with a rotating shaft 4, the rotating shaft 4 is fixed on the bracket 1, and the rotating shaft 4 is provided with a driving part 9. At least one arc shifting piece 13 is arranged on the inner rotating platform 2, preferably four arc shifting pieces 13 distributed in a circumferential array are arranged, and the protruding direction of the arc shifting pieces 13 is the same as the rotating direction of the inner rotating platform 2.
The driving part 9 comprises a motor, a driving belt wheel arranged on the motor, a driven belt wheel arranged on the rotating shaft and a belt connecting the driving belt wheel and the driven belt wheel, and the motor is fixed on the bracket.
As shown in fig. 6 and 7, the bone hopper 5 is further provided with a feeding control rod and a bone hopper bracket for fixing the feeding control rod, the lower end of the feeding control rod is provided with a circular truncated cone column piston, and the circular truncated cone column piston normally seals the bone hopper 5; the flow control rod is provided with an external thread, the bone hopper support is provided with an internal thread, and the gap between the circular truncated cone column piston and the bottom of the bone hopper is indirectly adjusted by controlling the circular truncated cone column piston to move up and down.
As shown in fig. 2, at least one sliding chute is arranged on the inner rotary table 2, preferably four sliding chutes are arranged on the inner rotary table 2, the sliding chutes are distributed around in an array manner, the tangential directions of the sliding chutes and the inner rotary table 2 are overlapped, and the width and the depth of each sliding chute are 0.3-0.7 times of the average diameter of the aggregate. An outer baffle 6 is arranged on the outer fixing plate 3 in the circumferential direction, the section of the outer baffle 6 is U-shaped, and the outer baffle 6 with the U-shaped section can collect non-needle sheet aggregate; the outer baffle 6 is provided with a material discharging pipe 10, and an outer collecting tank 11 is correspondingly arranged below the material discharging pipe 10.
Outer fixed plate 3 below still is equipped with the interior baffle 7 of circumference, and interior baffle 7 is used for leading the scope to collecting hopper 8 from the needle slice aggregate that falls between outer fixed station 3 and the 2 clearances of interior revolving stage, and interior revolving stage 2 below is equipped with collects hopper 8, collects hopper 8 below and is equipped with interior collection groove 12, the collection and the transfer of the needle slice aggregate after the convenient screening aggregate.
The working principle of the invention is as follows: as shown in fig. 7 and 8 (the round balls and the square blocks in the figures represent non-needle flake aggregate and needle flake aggregate, respectively); through the clearance between the outer fixed table 3 and the inner rotary table 2 and the height difference between the outer fixed table 3 and the inner rotary table 2, the screening of needle sheet aggregate is realized, the non-needle sheet aggregate falls on the inner rotary table 2 from the aggregate hopper 5 (the aggregate hopper 5 uniformly disperses the aggregate on the inner rotary table), and the aggregate to be screened is uniformly distributed and thrown to the clearance between the outer fixed table 3 and the inner rotary table 2 through the rotating action of the inner rotary table 2 and the guiding action of the arc-shaped shifting sheet 13 arranged on the inner rotary table 2;
as shown in fig. 7 and 8, when the non-needle sheet-shaped aggregate slides to the gap boundary between the outer fixed table 3 and the inner rotating table 2 under the rotation action of the inner rotating table 2, the height difference between the outer fixed table 3 and the inner rotating table 2 is lower than that of the non-needle sheet-shaped aggregate, so that the non-needle sheet-shaped aggregate having a movement tendency cannot be limited and blocked, and the non-needle sheet-shaped aggregate rolls over the outer fixed table 3 and leaves the inner rotating table 2; when a part of the non-needle sheet-shaped aggregate is blocked by the outer fixing plate 3, the non-needle sheet-shaped aggregate can continuously roll under the action of the inner rotating platform 2 until the non-needle sheet-shaped aggregate rolls out of the outer fixing platform 3 at the back;
the needle-shaped aggregate can be blocked by the outer fixed platform 2, the needle-shaped aggregate blocked by the outer fixed platform 2 can enter the gap between the outer fixed platform 3 and the inner rotary platform 2 under the action of the inner rotary platform 2 (providing centrifugal force) and the outer fixed platform 3 (guiding), the aggregate leaves the inner rotary platform 2 through the gap, the width of the gap between the outer fixed platform 3 and the inner rotary platform 2 is gradually increased from an inlet, and the needle-shaped aggregate cannot be clamped in the gap when entering the gap;
when the aggregate card was between outer fixed station 3 and interior revolving stage 2, partly aggregate can be brought into the clearance between outer fixed station 3 and the interior revolving stage 2 under the rotatory effect of interior revolving stage 2 (the clearance is less in import department, more inwards the clearance width is big more), partly then continue to block in the clearance, along with the rotation of interior revolving stage 2, the aggregate of card in the clearance can be by the strip 14 jack-up of dialling on the interior revolving stage 2 and derive, make the aggregate can not block in the clearance, the aggregate that is derived by the jack-up simultaneously continues to sieve under the effect of interior revolving stage 2 again, until leaving interior revolving stage 2 under the rotatory effect of spout 15 on from outer fixed station 3 or interior revolving stage 2.
The working process is as follows: firstly, aggregate to be screened is added into an aggregate hopper 5; the driving part is opened to enable the motor to rotate, and the motor sequentially transmits power to the main belt wheel, the belt, the driven wheel, the rotating shaft 4 and the inner rotating platform 2 to rotate; then, the falling speed of the aggregates is controlled by adjusting a feeding control rod, the aggregates are uniformly distributed on the inner rotating platform 2 through the circular truncated cone plungers on the aggregate hopper 5, the aggregates falling on the inner rotating platform 2 slide to a gap between the outer fixing platform 3 and the inner rotating platform 2 under the action of the rotating centrifugal force of the inner rotating platform 2, and the aggregates to be screened move in parts: 1. the needle-shaped aggregates drop from the gap between the outer fixed platform 3 and the inner rotary platform 2, are guided by the inner baffle 7 and fall on the collecting hopper 8, and are collected in the inner collecting tank by the collecting hopper 8; 2. a part of non-needle sheet aggregate directly crosses the outer fixed table 3 under the centrifugal action of the inner rotating table 2 and is collected in the outer baffle 6, and then the non-needle sheet aggregate in the outer baffle 6 is collected in the outer collecting tank 11 through the discharge pipe 10; 3. under the rotating conveying action of the inner rotating platform 2, a part of non-needle sheet aggregate rolls along the circumference of the inner rotating platform 2 until the aggregate moves to the position of the chute 15 on the outer fixing frame 3, the aggregate moves to the outer baffle 6 from the chute 15, and then the non-needle sheet aggregate in the outer baffle 6 is collected in the outer collecting tank 11 through the discharge pipe 10.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides an ultra-high pump concrete is with needle slice aggregate screening plant which characterized in that: the bone hopper is fixed on the outer fixed table through a support bracket; the upper surface of the outer fixed table is higher than the upper surface of the inner rotary table, and a gap for needle sheet aggregate to pass through is reserved between the outer fixed table and the inner rotary table; the inner rotating table is provided with at least one shifting strip, and the shifting strip is positioned between the outer fixing table and the gap on the upper surface of the inner rotating table; the inner rotary table is provided with a rotating shaft, the rotating shaft is fixed on the support, and the rotating shaft is provided with a driving part.
2. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: the bone hopper is also provided with a feeding control rod and a bone hopper bracket for fixing the feeding control rod, the lower end of the feeding control rod is provided with a circular table column piston, and the circular table column piston seals the bone hopper under a normal state.
3. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 2, wherein: the flow control rod is provided with an external thread, and the bone hopper support is provided with an internal thread.
4. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: at least one arc shifting piece is arranged on the inner rotating platform, and the protruding direction of the arc shifting piece is the same as the rotating direction of the inner rotating platform.
5. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: at least one sliding groove is arranged on the inner rotating platform and coincides with the tangential direction of the inner rotating platform.
6. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 5, wherein: the outer fixing plate is circumferentially provided with an outer baffle, and the cross section of the outer baffle is U-shaped; the outer baffle is provided with a material discharge pipe, and an outer collecting tank is correspondingly arranged below the material discharge pipe.
7. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: outer fixed plate below still is equipped with the interior baffle of circumference, interior revolving stage below is equipped with collects the hopper, it is equipped with interior collection groove to collect the hopper below.
8. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: the height difference between the upper surface of the outer fixed table and the upper surface of the inner rotating table is 0.1-0.5 times of the average diameter of the aggregates, and the height difference between the upper surfaces of the outer fixed table and the inner rotating table is smaller than the average diameter of the screened aggregates.
9. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: the width of the gap between the outer fixed table and the inner rotary table is gradually increased from the inlet.
10. The needle-shaped aggregate screening device for ultra-high pumping concrete according to claim 1, wherein: the driving part comprises a motor, a driving belt wheel arranged on the motor, a driven belt wheel arranged on the rotating shaft and a belt connecting the driving belt wheel and the driven belt wheel, and the motor is fixed on the support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111082182.8A CN113798190B (en) | 2021-09-15 | 2021-09-15 | Needle sheet-shaped aggregate screening device for ultrahigh pumping concrete |
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| CN202111082182.8A CN113798190B (en) | 2021-09-15 | 2021-09-15 | Needle sheet-shaped aggregate screening device for ultrahigh pumping concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117943271A (en) * | 2024-03-20 | 2024-04-30 | 济南东铁轨道交通建材有限公司 | Automatic screening and selecting device for concrete production |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113798190B (en) | 2023-01-03 |
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