CN116213235A

CN116213235A - Building material transportation sieving mechanism

Info

Publication number: CN116213235A
Application number: CN202211720394.9A
Authority: CN
Inventors: 龙德顺; 郭永松
Original assignee: Ningbo Defeng New Material Technology Co ltd
Current assignee: Ningbo Defeng New Material Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-06

Abstract

The invention discloses a building material transportation screening device, which comprises a treatment tank, wherein the treatment tank comprises a tank body and a cover body, the tank body is provided with an air inlet nozzle, the cover body is provided with an air outlet and a feed inlet, a crushing assembly and a screening assembly are arranged in the tank body, the crushing assembly comprises a supporting plate, the supporting plate is provided with a feed inlet which is staggered with the feed inlet, the supporting plate is provided with a rotating shaft which can intermittently rotate, the rotating shaft is fixedly provided with a first pushing plate, the rotating shaft is rotationally connected with a rotating sleeve rod, the rotating sleeve rod is fixedly provided with a plurality of stirring rods, the screening assembly comprises a screen plate, the screen plate is rotationally provided with a vertical second pushing plate, the screen plate is provided with a first screen mesh, a second screen mesh and a discharge chute, and the tank body is provided with a discharge hole and a sand outlet; the first pushing plate which intermittently rotates can effectively prevent sand from being accumulated at the feed inlet, improve the crushing efficiency and prevent the rotating shaft from being blocked due to accumulation; the cooperation of the first sieve mesh, the second sieve mesh and the discharge chute which are arranged simultaneously can test the further filtering and screening of sand.

Description

Building material transportation sieving mechanism

Technical Field

The invention relates to the field of building sand screening, in particular to a building material transportation screening device.

Background

The mixed mortar is generally formed by mixing cement, lime paste and sand, and is generally used for brickwork above the ground. The lime paste is added into the mixed mortar, so that the workability of the mortar is improved, the operation is convenient, and the compactness and the work efficiency of the masonry are improved. The cement mortar is used for building foundation and wall, and is used as an adhesive for blocky masonry materials, such as rubble and red bricks; and secondly, the plastering agent is used for plastering indoors and outdoors. When the cement mortar is used, additives such as a micro-foam agent, waterproof powder and the like are also often added to improve the workability and the viscosity of the cement mortar;

in the mortar preparation process, raw materials (sand) need to be transported to a preparation place through a transportation belt, and in order to ensure the qualification of the mortar quality, in general, the prepared mortar has a mud content of not more than 5 percent (0.2 masonry mortar), and the cement mixed mortar with a strength grade of M2.5 has a mud content of not more than 10 percent;

in the actual preparation process, impurities such as stones and soil are often mixed in the raw sand, wherein the soil mixed in the sand can be divided into various types, for example: huang Hetu subtype stiff loess (which is hard and difficult to disperse after being completely dried), sandy soil (easy to disperse after being dried) and the like, because the amount of sand generally required by a construction site is large, uneven drying of the sand is often caused when the sand enters a drying mechanism for drying, and the soil inside the sand is also correspondingly easy to be in an incomplete drying condition, so that the outer drying and the inner wetting of the yellow brown soil subtype stiff loess are easy to occur in the subsequent screening process, the impact condition is difficult to occur in the screening process, the soil of the soil is easily broken into a plurality of small blocks to be mixed in the sand, and the soil (yellow brown subtype stiff loess) mixed in the sand can cause the increase of the mud content of the sand in the subsequent mortar preparation process, thereby influencing the mortar quality.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the building material transportation screening device is simple in structure, reliably breaks and separates sand and discharges the sand in a classified mode to reduce the soil content.

In order to solve the technical problems, the invention is solved by the following technical scheme: the utility model provides a building material transportation sieving mechanism, includes the treatment tank, the treatment tank include the jar body and be used for sealing the lid of the jar body, the bottom of the jar body be provided with the inlet nozzle that supplies the steam to let in the jar body, the lid be provided with gas outlet and feed inlet, the jar internal broken subassembly and screening subassembly of being provided with, broken subassembly include the backup pad fixed with the jar body, the backup pad be provided with the feed inlet staggered feed opening mutually, the vertical rotation axis that is provided with intermittent type pivoted of backup pad, the rotation axis be fixed with first scraping wings, the rotation axis still rotate and be connected with the rotatory loop bar that the level set up, rotatory loop bar along its radial fixation have a plurality of puddles, the one end coaxial fixed with rotary gear of rotation axis is kept away from to rotatory loop bar, the jar body be fixed with annular rack, rotary gear mesh with annular rack, screening subassembly include, the rotation be provided with vertical second scraping wings with the sieve mesh, the rotation axis be provided with first, second and with the discharge opening of the sieve looks and the discharge tank that staggers mutually, the sieve opening of the sieve has the discharge tank is equipped with.

Further, the first pushing plate comprises two baffle plates which are arranged vertically to each other, the first pushing plate divides the space above the supporting plate into four crushing areas, and corresponding rotary loop bars are arranged in the four crushing areas in a rotating mode; the advantage lies in can separate spatial distribution through the separation blade that sets up, from utilizing the intermittent type nature motion of rotation axis to send into corresponding region with even equivalent of sand, rotation axis rotation in-process utilizes the puddler to carry out synchronous crushing to improve crushing efficiency, avoid appearing piling up of sand and make the puddler stirring insufficient.

Further, the rotating shaft is provided with a fixed column, the rotating sleeve rod is rotatably sleeved outside the fixed column, the rotating sleeve rod revolves around the rotating shaft, and the rotating sleeve rod rotates around the axis of the fixed column; the rotary sleeve rod has the advantages that the support stability of the rotary sleeve rod is improved through the arranged fixed columns, namely, the sand is convenient to crush through the running fit of the fixed columns and the rotary sleeve rod, meanwhile, the fixed columns extend into the rotary sleeve rod to provide stronger deformation resistance and transverse driving force for the rotary sleeve rod, and the reliability of the matching of the rotary gear and the annular rack is guaranteed.

Furthermore, the tank body is provided with an annular mounting groove, the annular rack is fixed in the mounting groove, and a rotary gear fixed on the rotary loop bar extends into the mounting groove to be meshed with the annular rack; the annular rack has the advantages that the annular rack is fixed in the mounting groove, the fixing reliability of the annular rack can be guaranteed, the rotary gear stretches into the mounting groove to be meshed with the annular rack, the influence of sand can be reduced, and the annular gear is arranged above the rotary gear.

Further, a sleeve in running fit with the rotary sleeve rod is sleeved on the rotary sleeve rod, a rotary clamping groove corresponding to the sleeve is formed in the rotary sleeve rod, connecting rods positioned on two sides of the rotary sleeve rod are fixed on the sleeve rod, a pushing piece is fixed at one end of each connecting rod, far away from the sleeve, and extends into the mounting groove and is close to the side wall of the mounting groove; the sand-cleaning device has the advantages that in order to further reduce the influence of sand on the matching of the rotary gear and the annular rack, sand in the mounting groove can be pushed and cleaned through the matching of the connecting rod and the pushing piece, namely sundries on the revolution path of the rotary gear are removed, and the meshing reliability of the rotary gear and the annular rack is improved.

Further, the rotary shaft is driven by a first driving mechanism to intermittently rotate, the first driving mechanism comprises a mounting shell, a first driving motor, an intermittent gear and a transmission gear, the mounting shell is fixed with the tank body and is positioned below the supporting plate, the transmission gear is coaxially fixed with the rotary shaft and is positioned in the mounting shell, the intermittent gear is rotationally arranged in the mounting shell and is meshed with the transmission gear, the first driving motor is fixedly arranged at the outer side of the tank body, and the first driving motor drives the intermittent gear to rotate through a transmission belt; the sand feeding device has the advantages that intermittent rotation of the rotary shaft can be guaranteed through cooperation of the intermittent gear and the transmission gear, so that the sand fed from the feeding port is reliably dispersed into a plurality of areas, uneven crushing caused by excessive discharging of the sand in the same area is reduced, and soil dust cannot be fully brought out from the air outlet end along with air flow, so that the soil content in the sand exceeds standard.

Further, the second pushing plate is driven by a second driving mechanism, the second driving mechanism comprises a second driver, the second driver is fixed with the tank body, and an output shaft of the second driver is fixed with the second pushing plate; the advantage lies in that through the drive output shaft direct drive second pushing plate that sets up rotate can provide stronger driving force for the second pushing plate for even pile up together after falling into on the sieve from the feed opening and also can promote it and remove along the sieve and carry out the sieve and leak.

Further, a protective shell is covered outside the output shaft of the second driver; the advantage lies in that can effectively isolate the output shaft of sand and second driver through the protective housing that sets up, avoid sand to get into wherein leading to wearing and tearing aggravate to increase of service life.

Further, the first sieve holes, the second sieve holes and the discharge chute are sequentially arranged along the rotation direction of the second pushing plate, and the aperture of the first sieve holes is larger than that of the second sieve holes; the advantage lies in through the first sieve mesh, second sieve mesh and the blown down tank that set gradually, can carry out the screening step by step to the sand when the second pushes away the flitch and promote the sand, primary big aperture first sieve mesh is corresponding with the feed opening, and the first sieve mesh of first follow is leaked downwards when the sand falls into behind the sieve, and when the second pushes away the flitch and promotes, most sand leaks down from first sieve mesh, and the remaining sand that mixes with large granule impurity is in the promotion in-process, and the sand leaks downwards from the second sieve mesh and large granule impurity outwards discharges along with the lapse from the blown down tank to realize screening step by step fast, ensure the speed that the sand leaked downwards and can avoid large granule impurity to leak down.

Further, the discharging chute is provided with an outward slope, and the slope is provided with a second sieve hole penetrating through the slope; the sand filter has the advantages that smooth discharge of large-particle impurities can be guaranteed through the slope, namely, the large-particle impurities are discharged from the discharge hole, and the second sieve holes formed in the slope can also further filter sand, so that the sand is discharged downwards from the sand outlet.

Compared with the prior art, the invention has the following beneficial effects: the hot air flow is introduced into the treatment tank through the air inlet nozzle, so that the temperature of the treatment tank is increased to dry the sand mixture entering from the feeding at high temperature, the viscosity of the sand mixture is reduced by reducing the water contained in the soil, and the sand mixture is prevented from being bonded with sand so as to facilitate subsequent crushing. The crushing assembly can be used for efficiently scattering and crushing the dried sand, so that the adhesion between the soil and the sand is further reduced, the soil is converted into soil dust, and the soil dust is discharged along with the air flow from the air outlet, and the soil content in the sand is reduced. Meanwhile, the intermittent rotating first pushing plate can effectively prevent sand from being accumulated at the feeding hole, improve the crushing efficiency and prevent the efficiency from being reduced due to accumulation and even the rotating shaft from being blocked. The cooperation of the annular rack and the rotary gear arranged on the tank body can ensure the rotation reliability of the rotary loop bar, and further ensure the rotation reliability of the stirring rod fixed on the rotary loop bar. The cooperation of the first sieve mesh, the second sieve mesh and the blown down tank that set up simultaneously can try down to further filter the screening to the sand, can also improve the homogeneity of sand granule when guaranteeing that the sand contains the soil content lower.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic view of the installation of a crushing assembly and a screening assembly of the present invention;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

FIG. 5 is a top view of the internal structure of the can body of the present invention;

FIG. 6 is a schematic view of a crushing assembly according to the present invention;

FIG. 7 is a second schematic view of a crushing assembly according to the present invention;

FIG. 8 is a schematic view illustrating the disassembly of the rotary sleeve rod and the sleeve according to the present invention;

FIG. 9 is a schematic diagram of the cooperation of the rotary loop bar and the annular rack of the present invention;

FIG. 10 is a schematic view of an assembled screen assembly of the present invention;

fig. 11 is a schematic view of the screen assembly of the present invention.

Detailed Description

The present invention is described in further detail below with reference to the accompanying drawings.

The following description is presented to enable one of ordinary skill in the art to practice the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. indicate orientations or positions based on the orientation or positional relationship shown in the drawings, which are merely for convenience in describing the present simplified description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus the above terms are not to be construed as limiting the present invention.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

1-11, a building material transportation screening device comprises a treatment tank 1, wherein the treatment tank 1 comprises a tank body 11 and a cover body 12 for closing the tank body 11, an air inlet nozzle 111 for introducing hot air into the tank body 11 is arranged at the bottom of the tank body 11, an air outlet 121 and a feed inlet 122 are arranged on the cover body 12, and a crushing assembly 2 and a screening assembly 3 are arranged in the tank body 11; wherein the crushing assembly 2 comprises a supporting plate 21, the edge of the supporting plate 21 is fixed with the tank 11 in a sealing way, and a feed opening 211 staggered with the feed opening 122 is arranged on the supporting plate 21 and used for conveying the treated sand downwards. In order to improve the crushing efficiency and avoid sand accumulation, a rotary shaft 22 capable of intermittently rotating is vertically arranged in the middle of the supporting plate 21, and the rotary shaft 22 is fixed with a first pushing plate 23 for pushing sand to the blanking opening 211. Specifically, the aforesaid pushing plate includes two separation blades 231 that set up mutually perpendicular in vertical direction, divide into four broken regions with backup pad 21 top space through separation blade 231, all horizontal rotation is provided with rotatory loop bar 24 in four broken regions, rotatory loop bar 24 is fixed with a plurality of puddlers 242 along its radial, utilize the intermittent type nature motion of rotation axis 22 to send into corresponding region with the even equivalent of sand, rotation axis 22 rotates the in-process and utilizes puddler 242 to carry out synchronous breakage, thereby improve crushing efficiency, avoid appearing piling up of sand and make puddler 242 stirring insufficiently.

In order to ensure the reliable rotation of the rotary sleeve rod 24, a fixed column 221 is arranged on the rotary shaft 22, the rotary sleeve rod 24 is rotatably sleeved outside the fixed column 221, the rotary sleeve rod 24 revolves around the rotary shaft 22, the rotary sleeve rod 24 rotates around the axis of the fixed column 221, namely, a rotary gear 241 is coaxially fixed at one end of the rotary sleeve rod 24 far away from the rotary shaft 22, the tank 11 is fixedly provided with an annular rack 25, the rotary gear 241 is meshed with the annular rack 25 to drive the rotary sleeve rod 24 to rotate, the support stability of the rotary sleeve rod 24 is improved through the fixed column 221, namely, the rotary sleeve rod 24 is convenient to crush sand through the running fit of the fixed column 221 and the rotary sleeve rod 24, meanwhile, the fixed column 221 stretches into the rotary sleeve rod 24 to provide stronger anti-deformation capability and transverse driving force, and the reliability of the matching of the rotary gear 241 and the annular rack 25 is ensured. It should be noted that the rotation fit manner of the rotary sleeve 24 and the rotary shaft 22 may also be that a fixed shaft is disposed at one end of the rotary sleeve 24, and the fixed shaft is rotatably inserted into the rotary shaft 22.

In order to avoid the influence of sand on the matching of the annular rack 25 and the rotary gear 241, an annular mounting groove 112 is formed in the tank 11, the annular rack 25 is fixed in the mounting groove 112, the rotary gear 241 fixed on the rotary sleeve rod 24 extends into the mounting groove 112 to be meshed with the annular rack 25, and the annular rack 25 is located above the rotary gear 241.

Still further, in order to improve the reliability of the cooperation between the annular rack 25 and the rotary gear 241, the rotary sleeve rod 24 is sleeved with a sleeve 26 in a rotating fit with the rotary sleeve rod, the rotary sleeve rod 24 is provided with a rotary clamping groove 243 corresponding to the sleeve 26, the sleeve 26 is fixedly provided with connecting rods 261 positioned at two sides of the rotary sleeve rod 24, one ends of the connecting rods 261, far away from the sleeve 26, are fixedly provided with push plates 262, the push plates 262 extend into the mounting grooves 112 and are close to the side walls of the mounting grooves 112, that is, sand in the mounting grooves 112 can be pushed and swept through the cooperation between the connecting rods 261 and the push plates 262, that is, sundries on the revolution path of the rotary gear 241 are cleared, and the meshing reliability of the rotary gear 241 and the annular rack 25 is improved.

The rotary shaft 22 is driven by the first driving mechanism 27 to intermittently rotate, the first driving mechanism 27 includes a mounting shell 271, a first driving motor 272, an intermittent gear 273 and a transmission gear 274, the mounting shell 271 is fixed with the tank 11 and is located below the supporting plate 21, the transmission gear 274 is coaxially fixed with the rotary shaft 22 and is located in the mounting shell 271, the intermittent gear 273 is rotationally arranged in the mounting shell 271 and is meshed with the transmission gear 274, the first driving motor 272 is fixedly arranged at the outer side of the tank 11, the first driving motor 272 drives the intermittent gear 273 to rotate through a driving belt, the intermittent rotation of the rotary shaft 22 can be ensured through the cooperation of the intermittent gear 273 and the transmission gear 274, thereby ensuring the reliable dispersion of sand fed in by the feed inlet 122 into a plurality of areas, reducing the problem that the crushed uneven sand is caused by excessive in the same area, and the dust can not fully bring out the dust from the air outlet end along with the air flow, so that the content of the sand exceeds standard.

The screening assembly 3 comprises a screening plate 31, the screening plate 31 is rotatably provided with a vertical second pushing plate 32, the screening plate 31 is provided with a first screening hole 321, a second screening hole 322 and a discharging groove 323 staggered with the discharging hole 211, the tank 11 is provided with a discharging hole 114 corresponding to the discharging groove 323, and the bottom of the tank 11 is also provided with a plurality of sand outlets 113 which are uniformly distributed. The second pushing plate 32 is driven by a second driving mechanism, the second driving mechanism comprises a second driver 33, the second driver 33 is fixed with the tank 11, an output shaft of the second driver 33 is fixed with the second pushing plate 32, a protective shell 34 is covered outside an output shaft of the second driver 33, the second pushing plate 32 is directly driven to rotate by a set driving output shaft, so that stronger driving force can be provided for the second pushing plate 32, and the second pushing plate 32 can be pushed to move along the screen plate 31 even if stacked after falling onto the screen plate 31 from the discharging opening 211. The sand and the output shaft of the second driver 33 can be effectively isolated through the arranged protective shell 34, so that the sand is prevented from entering the protective shell to cause abrasion aggravation, and the service life is prolonged.

The first sieve holes 321, the second sieve holes 322 and the discharge chute 323 are sequentially arranged along the rotation direction of the second pushing plate 32, the aperture of the first sieve holes 321 is larger than that of the second sieve holes 322, and the aperture of the first sieve holes 321 and the aperture of the second sieve holes 322 are smaller than the size of granular impurities or sand; through the first sieve mesh 321, second sieve mesh 322 and blown down tank 323 that set gradually, can carry out the screening step by step to the sand when second pushing plate 32 promotes the sand, primary large aperture first sieve mesh 321 is corresponding with feed opening 211, first follow first sieve mesh 321 downwards leaks after the sand falls into sieve 31, when second pushing plate 32 promotes, most sand leaks down from first sieve mesh 321, the remaining sand that mixes with large granule impurity is in the promotion in-process, the sand leaks down from second sieve mesh 322 and large granule impurity outwards discharges along with the lapse from blown down tank 323, thereby realize quick screening step by step, ensure the speed that sand leaked down and can avoid large granule impurity to leak down.

It should be noted that, the discharging chute 323 is provided with an outward slope 324, the slope 324 is further provided with a second sieve aperture 322 penetrating through the slope 324, the smooth discharging of the large-particle impurities can be ensured by the slope 324, namely, the large-particle impurities are discharged from the discharging hole 114, and the second sieve aperture 322 arranged on the slope 324 can also further filter sand, so that the sand is discharged from the sand outlet 113 downwards.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims

1. The utility model provides a building material transportation sieving mechanism, includes the treatment tank, the treatment tank include the jar body and be used for sealing the lid of the jar body, its characterized in that, the bottom of the jar body be provided with the inlet nozzle that supplies the steam to let in the jar body, the lid be provided with gas outlet and feed inlet, the jar internal broken subassembly and screening subassembly that are provided with, broken subassembly include the backup pad fixed with the jar body, the backup pad be provided with the feed inlet staggered feed opening mutually, the backup pad vertical be provided with intermittent type pivoted rotation axis, the rotation axis be fixed with first flitch that pushes away, the rotation axis still rotate and be connected with the rotatory loop bar that the level set up, rotatory loop bar be fixed with a plurality of puddlers along its radial direction, the one end coaxial fixed with rotary gear of rotation axis is kept away from to rotatory loop bar, the jar body be fixed with annular rack, rotary gear mesh with annular rack, screening subassembly including, the sieve mesh rotate and be provided with vertical second and push away from the flitch with the feed opening mutually, the sieve mesh be provided with first, second and the discharge slot that staggers mutually with the sieve opening of the sieve, the bottom of the sieve has the sieve is equipped with the discharge tank of a plurality of sieve.

2. The building material transportation screening device according to claim 1, wherein the first pushing plate comprises two blocking sheets which are arranged vertically to each other, the first pushing plate divides the space above the supporting plate into four crushing areas, and corresponding rotary loop bars are arranged in the four crushing areas in a rotating mode.

3. The building material transportation screening device according to claim 1, wherein the rotating shaft is provided with a fixed column, the rotating sleeve rod is rotatably sleeved outside the fixed column, the rotating sleeve rod revolves around the rotating shaft, and the rotating sleeve rod rotates around the axis of the fixed column.

4. A building material transportation screening device according to claim 3, wherein the tank body is provided with an annular mounting groove, the annular rack is fixed in the mounting groove, and the rotary gear fixed on the rotary sleeve rod extends into the mounting groove to be meshed with the annular rack.

5. The building material transportation screening device according to claim 4, wherein the rotary sleeve rod is sleeved with a sleeve in running fit with the rotary sleeve rod, the rotary sleeve rod is provided with a rotary clamping groove corresponding to the sleeve, the sleeve is fixedly provided with connecting rods positioned on two sides of the rotary sleeve rod, one end of each connecting rod, far away from the sleeve, is fixedly provided with a push plate, and the push plate extends into the mounting groove and is close to the side wall of the mounting groove.

6. The building material transportation screening device according to claim 1, wherein the rotating shaft is driven to intermittently rotate by a first driving mechanism, the first driving mechanism comprises a mounting shell, a first driving motor, an intermittent gear and a transmission gear, the mounting shell is fixed with the tank body and is located below the supporting plate, the transmission gear is coaxially fixed with the rotating shaft and is located in the mounting shell, the intermittent gear is rotationally arranged in the mounting shell and meshed with the transmission gear, the first driving motor is fixedly arranged on the outer side of the tank body, and the first driving motor drives the intermittent gear to rotate through a transmission belt.

7. The building material transportation and screening device according to claim 1, wherein the second pushing plate is driven by a second driving mechanism, the second driving mechanism comprises a second driver, the second driver is fixed with the tank body, and an output shaft of the second driver is fixed with the second pushing plate.

8. The building material transportation screening apparatus according to claim 7, wherein the outer housing of the output shaft of the second driver is provided with a protective housing.

9. The building material transportation and screening device according to claim 1, wherein the first screen holes, the second screen holes and the discharge chute are sequentially arranged along the rotation direction of the second pushing plate, and the aperture diameter of the first screen holes is larger than that of the second screen holes.

10. The building material transportation screening apparatus of claim 9, wherein the spout defines an outward slope, and wherein the slope defines a second screen aperture extending through the slope.