CN111940286B - Building construction is with swaing formula grit sieving mechanism - Google Patents
Building construction is with swaing formula grit sieving mechanism Download PDFInfo
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- CN111940286B CN111940286B CN202010795800.2A CN202010795800A CN111940286B CN 111940286 B CN111940286 B CN 111940286B CN 202010795800 A CN202010795800 A CN 202010795800A CN 111940286 B CN111940286 B CN 111940286B
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- fixed
- gear
- screening
- rack
- screening case
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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
- B07B1/30—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro within their own plane in or approximately in or transverse to the direction of conveyance
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
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- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a swinging type sand and stone screening device for building construction, which comprises a rack, a limiting disc and a storage chamber, wherein a feeding pipe is fixed at the upper end of the rack, the limiting disc is connected to the upper end inside the feeding pipe, a balancing weight is fixed inside the limiting disc, a supporting column is arranged at the lower end of a motor, blades and a fixed gear are sequentially fixed on the side surface of the supporting column from top to bottom, a fixing ring is connected to the outer side of the upper end of the discharging pipe, the storage chamber is arranged at the upper end of the fixing ring, and a discharging port is formed in the lower end of the rack. This building construction is with swaing formula grit sieving mechanism, and the device is when using, is the thrust that the slope form downward flow gave screening case horizontal direction through making the grit to make the screening case remove, and the gyro wheel can reduce the resistance that the screening case received, and after the screening case removed a definite position, the spring promoted the screening case and removed backward, makes the screening case sway, thereby avoids the phenomenon that the jam appears in the screening case.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a swing type sand screening device for building construction.
Background
Grit is because of its good hardness and stable chemical property, often need use the grit in the construction, and need filter the grit to the grit according to the diameter of grit when using the grit to be convenient for use the grit, and need use grit sieving mechanism when screening the grit, and general sieving mechanism has some shortcomings when using, for example:
firstly, as the application number CN201810249324.7 is a gravel screening device with a shock absorption function, when the device is used, the screening net is horizontal, so that after the device is used for a period of time, the screening net is easily blocked, and gravel with a larger diameter is on the surface of the screening net, which further affects the screening of the device, so that the device cannot be normally used;
secondly, general sieving mechanism is when using, because contain a large amount of dusts in the grit, can not avoid when screening the grit cause the dust to spill and scatter to the air, and general sieving mechanism is the open-type mostly, and does not remove dust, so can cause the dust to spill and scatter to the air, is inhaled internal back by the staff when the dust, will cause the injury to staff's health, and then is unfavorable for the use of device.
Disclosure of Invention
The invention aims to provide a swinging type sand screening device for building construction, which solves the problems that the device is easy to block, sand with larger screening net surface cannot be automatically cleaned and dust cannot be treated in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a construction is with swaing formula grit sieving mechanism, includes frame, spacing dish and apotheca, the upper end of frame is fixed with the inlet pipe, and the inside upper end of inlet pipe is connected with spacing dish to the inside of spacing dish is fixed with the balancing weight, the inside blast pipe that is provided with in upper end of frame, and the inside of blast pipe is fixed with the motor, the lower extreme of motor is provided with the support column, and the side of support column from last blade and the fixed gear of down being fixed with in proper order, the side of fixed gear is provided with the connection gear, and connects the one end at the dead lever of gear fixation, the central axis symmetry of connection gear about the dead lever is provided with 2, and the dead lever rotates the inside of connecting at the blast pipe, the lower extreme internal connection of blast pipe has the spliced pole, and the side of spliced pole is provided with the fixed gear, the upper end outside of blast pipe is connected with solid fixed ring, and solid fixed ring's upper end is provided with the apotheca, the apotheca is "L" shape, and the one end internal connection of apotheca fixed cap to the side of apotheca has seted up the fixed hole, the inside of frame is provided with the screening case, and the side of screening case is connected with the discharge gate, the lower extreme of frame has seted up inside has seted up the discharge gate.
Preferably, the upper end of inlet pipe is leaks hopper-shaped, and the lower extreme of inlet pipe is the slope form to inlet pipe and spacing dish constitute revolution mechanic, and the inside symmetry of spacing dish is provided with 2 balancing weights simultaneously.
Preferably, blast pipe and support column constitute rotating-structure, and the side of support column is the equal angle and is provided with the blade to support column and connecting gear pass through the fixed gear and are connected for the meshing, and connecting gear and spliced pole are connected for the meshing through connecting the gear simultaneously, and the spliced pole is "L" shape moreover, spliced pole and limiting plate are sliding connection.
Preferably, the limiting plate rotates to be connected in the bottom of inlet pipe, and the lower extreme of inlet pipe is inside to be seted up the fixed slot to the inside of fixed slot is fixed with the spring, and the one end of spring is connected with the limiting plate simultaneously, and the upper end of fixed slot and limiting plate is the annular moreover.
Preferably, blast pipe and solid fixed ring are threaded connection, and solid fixed ring and apotheca constitute revolution mechanic to apotheca and locking nut are connected for the block, and the side evenly distributed of locking nut has the fixed orifices simultaneously.
Preferably, the inside of screening case is the filter screen form, and the inside of screening case is the inclined plane to screening case and gyro wheel constitute revolution mechanic, and gyro wheel and frame are sliding connection simultaneously, and the rear end of screening case is fixed with the connecting rod moreover.
Preferably, the one end of connecting rod is connected with the spring, and the spring setting is in the inside of sill bar to sill bar and connecting rod constitute extending structure, and the sill bar is fixed in the outside of frame simultaneously.
Preferably, the number of the discharge holes is 2, and the upper end of each discharge hole is an inclined plane.
Compared with the prior art, the invention has the beneficial effects that: the swing type sand and stone screening device for building construction,
1. when the device is used, the sand flows downwards in an inclined shape, and intervals exist between every two falling of the sand, when the sand falls, the sand pushes the screening box in the horizontal direction due to the inclined shape, so that the screening box moves, the resistance borne by the screening box can be reduced by the roller, the screening box moves conveniently, and when the screening box moves to a certain position, the spring pushes the screening box to move backwards, so that the screening box swings, and the phenomenon that the screening box is blocked is avoided;
2. when the device is used, the motor drives the connecting column to rotate, the limiting plate is driven to rotate when the connecting column rotates, so that materials intermittently move downwards, and resistance caused by gravels and a screening box moving backwards is prevented;
3. when the grit gets into the inside back of screening case that flows down under the action of gravity, because the inside of screening case is the filter screen form, so can filter the grit according to the diameter of grit, the less grit of diameter can see through screening case downward flow, the inside of screening case is the inclined plane moreover, so the great grit of diameter can flow along the inclined plane of screening case, until flowing out from the left breach department of screening case, later the grit flows in the discharge gate, and then is convenient for collect the grit.
Drawings
FIG. 1 is a schematic overall front cross-sectional structural view of the present invention;
FIG. 2 is a schematic view of a top sectional view of the feed pipe and the spacing disk of the present invention;
FIG. 3 is a schematic sectional side view of the feed tube and limiting plate mounting arrangement of the present invention;
FIG. 4 is a top sectional view of the fixing groove and the spring assembly of the present invention;
FIG. 5 is a schematic sectional view showing the structure of the storage chamber and the locking cap of the present invention after they are installed;
FIG. 6 is a cross-sectional structural view of the exhaust pipe and motor assembly of the present invention;
FIG. 7 is a top sectional view of the screening box and roller assembly of the present invention;
fig. 8 is a front sectional structural schematic view of the installation of the screening box of the present invention.
In the figure: 1. a frame; 2. a feed pipe; 3. a limiting disc; 4. a balancing weight; 5. fixing grooves; 6. a spring; 7. a limiting plate; 8. an exhaust pipe; 9. an electric motor; 10. a support pillar; 11. a blade; 12. fixing a gear; 13. a connecting gear; 14. fixing the rod; 15. connecting columns; 16. a fixing ring; 17. a storage chamber; 18. a fixing cap; 19. a fixing hole; 20. a screening box; 21. a roller; 22. a connecting rod; 23. a bottom bar; 24. and (4) a discharge port.
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.
Referring to fig. 1-8, the present invention provides a technical solution: a swinging type sand screening device for building construction comprises a rack 1, a feeding pipe 2, a limiting disc 3, a balancing weight 4, a fixing groove 5, a spring 6, a limiting plate 7, an exhaust pipe 8, a motor 9, a support pillar 10, blades 11, a fixed gear 12, a connecting gear 13, a fixing rod 14, a connecting pillar 15, a fixing ring 16, a storage chamber 17, a fixing cap 18, a fixing hole 19, a screening box 20, a roller 21, a connecting rod 22, a bottom rod 23 and a discharge port 24, wherein the feeding pipe 2 is fixed at the upper end of the rack 1, the limiting disc 3 is connected with the upper end of the inner part of the feeding pipe 2, the balancing weight 4 is fixed in the limiting disc 3, the exhaust pipe 8 is arranged in the upper end of the rack 1, the motor 9 is fixed in the exhaust pipe 8, the support pillar 10 is arranged at the lower end of the motor 9, and the blades 11 and the fixed gear 12 are sequentially fixed on the side surface of the support pillar 10 from top to bottom, the side of fixed gear 12 is provided with connecting gear 13, and connecting gear 13 fixes the one end at dead lever 14, connecting gear 13 is provided with 2 about the central axis symmetry of dead lever 14, and dead lever 14 rotates the inside of connecting at blast pipe 8, the lower extreme internal connection of blast pipe 8 has spliced pole 15, and the side of spliced pole 15 is provided with fixed gear 12, the upper end outside of blast pipe 8 is connected with solid fixed ring 16, and the upper end of solid fixed ring 16 is provided with apotheca 17, apotheca 17 is "L" shape, and the one end internal connection of apotheca 17 has locking cap 18, and fixed orifices 19 has been seted up to the side of locking cap 18, the inside of frame 1 is provided with screening case 20, and the side of screening case 20 is connected with gyro wheel 21, discharge gate 24 has been seted up to the lower extreme inside of frame 1.
The upper end of the inlet pipe 2 is funnel-shaped, the lower end of the inlet pipe 2 is inclined, the inlet pipe 2 and the limiting disc 3 form a rotating structure, 2 balancing weights 4 are symmetrically arranged in the limiting disc 3, when the material is fed, the material is placed into the inlet pipe 2, the upper end of the inlet pipe 2 is funnel-shaped, leakage of the material can be prevented, the material can slide downwards along the inclined surface of the inlet pipe 2 and fall above the limiting disc 3, the limiting disc 3 can rotate due to the fact that the two ends of the limiting disc 3 are unbalanced, after the limiting disc 3 rotates, the limiting disc 3 is inclined, the material flows downwards along the inclined surface, when the material flows to the lower side, the limiting disc 3 recovers to the horizontal position, the two ends of the limiting disc 3 are provided with the balancing weights 4, the rotating angle range of the limiting disc 3 and the inlet pipe 2 is-80 degrees, the two ends of the limiting disc 3 are heavier, the material at the two ends of the limiting disc 3 can be prevented from flowing into the device and then cannot rotate under the action of friction force, the limiting disc 3 can not be recovered to the vertical position, and the device can not be recovered.
The exhaust pipe 8 and the support column 10 form a rotating structure, the side surfaces of the support column 10 are provided with blades 11 at equal angles, the support column 10 and the connecting gear 13 are in meshed connection through a fixed gear 12, the connecting gear 13 and the connecting column 15 are in meshed connection through a connecting gear 13, the connecting column 15 is in an L shape, the connecting column 15 and the limiting plate 7 are in sliding connection, the motor 9 drives the support column 10 to rotate, the blades 11 and the fixed gear 12 rotate along with the blades when the support column 10 rotates, gas in the device flows into the exhaust pipe 8 when the blades 11 rotate, dust flows along with the gas, the dust removing purpose is achieved, the connecting gear 13 rotates along with the fixed gear 12 when the fixed gear 12 rotates, the connecting gear 12 rotates due to the fact that the diameter of the fixed gear 12 is smaller than that of the connecting gear 13, the rotating speed of the connecting gear 13 is slower, the connecting gear 13 at the lower end is connected with the connecting gear 13 through a fixing rod 14, the connecting gear 13 at the lower end also rotates, and the connecting gear 13 rotates again due to the fact that the diameter of the fixed gear 12 is larger than that the connecting gear 12 rotates.
Limiting plate 7 rotates the bottom of connecting at inlet pipe 2, and inlet pipe 2's lower extreme is inside has seted up fixed slot 5, and the inside of fixed slot 5 is fixed with spring 6, simultaneously spring 6's one end is connected with limiting plate 7, and the upper end of fixed slot 5 and limiting plate 7 is the annular, can contact with limiting plate 7 at pivoted in-process when spliced pole 15, thereby drive limiting plate 7 and rotate, it is no longer spacing to inlet pipe 2 when limiting plate 7 rotates, make the material flow from inlet pipe 2, and when inlet pipe 2 rotates, spring 6 can stretch out and draw back, after limiting plate 7 and spliced pole 15 do not contact again, spring 6 drives spliced pole 15 and resumes the normal position and cover inlet pipe 2 again, and then the admission speed of control material, increase the efficiency of screening.
The inside of screening case 20 is the filter screen form, and the inside of screening case 20 is the inclined plane, and screening case 20 and gyro wheel 21 constitute rotating-structure, gyro wheel 21 and frame 1 are sliding connection simultaneously, and the rear end of screening case 20 is fixed with connecting rod 22, after the grit flowed in the inside of screening case 20, owing to the inside filter screen form that is of screening case 20, so can filter the grit, and its inside is the inclined plane, so the grit that the diameter is less can directly flow in the below through screening case 20, and the grit that the diameter is great can flow along the inclined plane of screening case 20, after removing to the bottom, the grit flowed from the breach of screening case 20 left end.
One end of the connecting rod 22 is connected with the spring 6, the spring 6 is arranged inside the bottom rod 23, the bottom rod 23 and the connecting rod 22 form a telescopic structure, meanwhile, the bottom rod 23 is fixed on the outer side of the frame 1, when sand flows out from the feeding pipe 2, because the lower end of the feeding pipe 2 is a slope, and the feeding pipe 2 and the screening box 20 have a certain height difference, the sand can flow downwards in an inclined shape to the inside of the storage chamber 17, so that a transverse force is given to the storage chamber 17, at the moment, the storage chamber 17 moves to one side, the roller 21 can rotate, so that the friction force between the storage chamber 17 and the frame 1 is reduced, the movement of the storage chamber 17 is convenient, when the storage chamber 17 moves to one side, the connecting rod 22 moves into the inside of the bottom rod 23 along with the movement, the spring 6 contracts along with the movement, then the spring 6 drives the connecting rod 22 to move, the screening box 20 swings along with the movement, so that the blocking of the screening box 20 is prevented, and the sand does not swing due to the intermittent downward flow, so that the speed of the screening box 20 is faster when the sand moves back, and the force between the sand is counteracted, and the problem of the screening box 20 is prevented from swinging is solved.
The working principle is as follows: when the swing type sand and stone screening device for building construction is used, firstly, the device is connected with an external power supply, then sand and stone are added into the feeding pipe 2, at the moment, the sand and stone can flow downwards to the upper part of the limiting disc 3 along the inclined surface of the feeding pipe 2, the limiting disc 3 rotates due to unbalanced weight of the upper end of the limiting disc 3, so that the limiting disc 3 is inclined, materials move downwards along the limiting disc 3, and then the balancing weight 4 drives the limiting disc 3 to rotate, so that the limiting disc 3 is restored to the original position;
the motor 9 drives the supporting column 10 to rotate, so that the blades 11 and the fixed gear 12 rotate, when the fixed gear 12 rotates, the connecting gear 13 and the fixed rod 14 are driven to rotate, the rotating speed of the fixed rod 14 is lower than that of the supporting column 10, the connecting gear 13 at the lower end of the fixed rod 14 drives the fixed gear 12 to rotate, the connecting column 15 rotates along with the connecting column, the rotating speed of the connecting column 15 is lower than that of the fixed rod 14, and the connecting column 15 contacts with the limiting plate 7 along with the rotation of the connecting column 15, so that the limiting plate 7 is driven to rotate;
when the limiting plate 7 rotates, the feeding pipe 2 is not stopped, so that the material flows into the inside of the rack 1, and when the limiting plate 7 is not contacted with the connecting column 15, the spring 6 drives the limiting plate 7 to return to the original position, so that the limiting plate 7 retracts into the inside of the fixing groove 5;
because the feed pipe 2 is inclined and the feed pipe 2 and the screening box 20 have a certain height difference, the material flows downwards in an inclined shape and falls on the surface of the screening box 20, because the material is inclined, horizontal thrust is formed on the screening box 20, so that the screening box 20 moves, the roller 21 can reduce the friction force applied to the screening box 20, when the screening box 20 moves, the connecting rod 22 moves along with the material and enters the inside of the bottom rod 23, the spring 6 in the bottom rod 23 also contracts, when the screening box 20 moves to a certain position, the spring 6 pushes the screening box 20 to move back, so that the screening box 20 swings, the phenomenon that the screening box 20 is blocked is prevented, because the screen mesh in the screening box 20 is inclined, the material with smaller diameter flows downwards through the screening box 20, and the material with larger diameter flows leftwards along the inclined plane until the material flows out from the notch at the left end of the screening box 20, and then the material flows downwards to the inside of the discharge port 24 under the action of gravity, so that the material is collected conveniently because the discharge port 24 is inclined;
when the blade 11 rotates, the gas in the rack 1 flows into the exhaust pipe 8 and then enters the storage chamber 17, impurities can be stored in the storage chamber 17, air can flow out to the outside along the fixing hole 19, after the device is used for a period of time, the storage chamber 17 is separated from the exhaust pipe 8 by rotating the fixing ring 16, the fixing cap 18 is moved downwards to be separated from the storage chamber 17, and then the impurities in the storage chamber 17 and the fixing cap 18 are cleaned, so that the overall practicability is improved.
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 (3)
1. The utility model provides a construction is with swaing formula grit sieving mechanism, includes frame (1), spacing dish (3) and apotheca (17), its characterized in that: the upper end of the rack (1) is fixed with an inlet pipe (2), the upper end of the inner part of the inlet pipe (2) is connected with a limiting disc (3), a balancing weight (4) is fixed in the limiting disc (3), an exhaust pipe (8) is arranged in the upper end of the rack (1), a motor (9) is fixed in the exhaust pipe (8), a support column (10) is arranged at the lower end of the motor (9), blades (11) and a fixed gear (12) are sequentially fixed on the side surface of the support column (10) from top to bottom, a connecting gear (13) is arranged on the side surface of the fixed gear (12), the connecting gear (13) is fixed at one end of the fixed rod (14), the connecting gear (13) is symmetrically arranged with 2 parts about the central axis of the fixed rod (14), the fixed rod (14) is rotatably connected in the exhaust pipe (8), a connecting column (15) is connected in the lower end of the exhaust pipe (8), the side surface of the connecting column (15) is provided with the fixed gear (12), a fixing ring (16) is connected to the outer side of the upper end of the exhaust pipe (8), a storage chamber (17) is arranged at the upper end of the fixed ring (16), one end of the storage chamber (17), and an L-shaped storage cap (17) is arranged at one end of the storage chamber (17), a fixing hole (19) is formed in the side face of the fixing cap (18), a screening box (20) is arranged inside the rack (1), the side face of the screening box (20) is connected with a roller (21), and a discharge hole (24) is formed in the lower end of the rack (1);
the upper end of the feeding pipe (2) is funnel-shaped, the lower end of the feeding pipe (2) is inclined, the feeding pipe (2) and the limiting disc (3) form a rotating structure, and 2 balancing weights (4) are symmetrically arranged inside the limiting disc (3);
the exhaust pipe (8) and the support column (10) form a rotating structure, blades (11) are arranged on the side faces of the support column (10) at equal angles, the support column (10) and the connecting gear (13) are in meshed connection through the fixed gear (12), the connecting gear (13) and the connecting column (15) are in meshed connection through the connecting gear (13), the connecting column (15) is L-shaped, and the connecting column (15) and the limiting plate (7) are in sliding connection;
the limiting plate (7) is rotatably connected to the bottom of the feeding pipe (2), a fixing groove (5) is formed in the lower end of the feeding pipe (2), a spring (6) is fixed in the fixing groove (5), one end of the spring (6) is connected with the limiting plate (7), and the upper ends of the fixing groove (5) and the limiting plate (7) are annular;
the interior of the screening box (20) is in a filter screen shape, the interior of the screening box (20) is an inclined plane, the screening box (20) and the roller (21) form a rotating structure, the roller (21) is in sliding connection with the rack (1), and a connecting rod (22) is fixed at the rear end of the screening box (20);
the one end of connecting rod (22) is connected with spring (6), and spring (6) set up the inside at sill bar (23) to sill bar (23) and connecting rod (22) constitute extending structure, and the outside in frame (1) is fixed in sill bar (23) simultaneously.
2. The swing type sand screening device for building construction according to claim 1, characterized in that: exhaust pipe (8) and solid fixed ring (16) are threaded connection, and solid fixed ring (16) and apotheca (17) constitute revolution mechanic to apotheca (17) and fixed cap (18) are connected for the block, and the side evenly distributed of fixed cap (18) has fixed orifices (19) simultaneously.
3. The swing type sand screening device for building construction according to claim 1, characterized in that: the number of the discharge holes (24) is 2, and the upper end of the discharge hole (24) is an inclined plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010795800.2A CN111940286B (en) | 2020-08-10 | 2020-08-10 | Building construction is with swaing formula grit sieving mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010795800.2A CN111940286B (en) | 2020-08-10 | 2020-08-10 | Building construction is with swaing formula grit sieving mechanism |
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| CN111940286A CN111940286A (en) | 2020-11-17 |
| CN111940286B true CN111940286B (en) | 2023-04-18 |
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| CN202010795800.2A Expired - Fee Related CN111940286B (en) | 2020-08-10 | 2020-08-10 | Building construction is with swaing formula grit sieving mechanism |
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| CN113280899B (en) * | 2021-07-24 | 2021-09-28 | 深圳市同富信息技术有限公司 | Grit feeding weighing device |
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