CN111760792A

CN111760792A - Concrete drying aggregate winnowing system

Info

Publication number: CN111760792A
Application number: CN202010599417.XA
Authority: CN
Inventors: 杨晓华; 陈羲; 王文; 张文杰
Original assignee: Taizhou Siqiang New Building Material Co ltd
Current assignee: Taizhou Siqiang New Building Material Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-10-13

Abstract

The invention discloses a concrete dry aggregate winnowing system which comprises a first separating chamber, wherein the upper end of the first separating chamber is provided with an opening, and an air inlet is formed in one side wall of the first separating chamber; the multiple groups of obliquely arranged bearing plates are connected between the two groups of parallel side walls of the first separation chamber, the bearing plates are sequentially arranged in a staggered mode from top to bottom, and the aggregates can slide down along the bearing plates layer by layer; a plurality of groups of vertically arranged guide plates are connected between two groups of parallel side walls of the first separation chamber and are in one-to-one correspondence with the bearing plates, and gaps for aggregates to fall are reserved between the lower ends of the guide plates and the bearing plates; the second separation chamber is communicated with the first separation chamber, and an air outlet is formed in one side wall of the second separation chamber, which is opposite to the air inlet; the bearing plate is positioned between the guide plate and the air inlet, and air flow from the air inlet can pass through the upper side and the lower side of the bearing plate and upwards enter the second separation chamber along the guide plate. The invention can effectively enhance the winnowing effect.

Description

Concrete drying aggregate winnowing system

Technical Field

The invention relates to the technical field of concrete aggregate screening, in particular to a concrete dry aggregate winnowing system.

Background

Concrete aggregate refers to a granular loose material that plays a role of a skeleton or filling in concrete. Because the concrete aggregate itself contains harmful components that affect the quality of the concrete, such as dust and soil, the concrete aggregate is usually screened after being sufficiently dried. The traditional screening mode often adopts the shale shaker to select separately, but adopts the shale shaker to select when selecting the aggregate, can bring great dust pollution, does not conform to the requirement of energy-concerving and environment-protective under the circumstances.

The Chinese patent with application publication number CN107457180A discloses a concrete dry aggregate continuous multi-stage sorting and grading device, which comprises a storage bin, a sorting barrel and a fixed box which are arranged from bottom to bottom, wherein a plurality of variable air volume valves are arranged on the barrel wall on one side of the sorting barrel, a material receiving cover plate and a material receiving box are correspondingly arranged on the barrel wall on the side, opposite to the variable air volume valves, of the sorting barrel, the air volume of different positions of the sorting barrel in the vertical direction is controlled through the variable air volume valves, aggregates with different particle sizes are collected into different material receiving cover plates, and particles with larger particle sizes and heavier weights fall into the fixed box downwards, so that the sorting purpose is achieved.

When the device is used for sorting, the aggregates fall in a columnar shape in the process of moving downwards from the storage bin, and in the horizontal section of the sorting barrel, the aggregate particles can form a barrier, and particularly in the part far away from the air port, the aggregate particles basically cannot be influenced by wind power; and because the aggregate particles separate the fender effect each other, some particles can't be followed the horizontal direction and moved, and then can't obtain effective separation, influence the selection by winnowing effect, consequently have great limitation, realize comparatively difficultly in the practical application.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a concrete dry aggregate winnowing system which can effectively solve the problem of poor effect of concrete aggregate winnowing in the prior art.

The above object of the present invention is achieved by the following technical solutions:

a concrete dry aggregate winnowing system comprises

The upper end of the first separation chamber is provided with an opening, and an air inlet is formed in one side wall of the first separation chamber;

the multiple groups of obliquely arranged bearing plates are connected between the two groups of parallel side walls of the first separation chamber, the bearing plates are sequentially arranged in a staggered mode from top to bottom, and the aggregates can slide down along the bearing plates layer by layer;

a plurality of groups of vertically arranged guide plates are connected between two groups of parallel side walls of the first separation chamber and are in one-to-one correspondence with the bearing plates, and gaps for aggregates to fall are reserved between the lower ends of the guide plates and the bearing plates; and

the second separation chamber is communicated with the first separation chamber, and an air outlet is formed in one side wall of the second separation chamber, which is opposite to the air inlet;

the bearing plate is positioned between the guide plate and the air inlet, and air flow from the air inlet can pass through the upper side and the lower side of the bearing plate and upwards enter the second separation chamber along the guide plate.

By adopting the technical scheme, air ducts for air flow to pass through are formed between the adjacent guide plates, between the guide plates at the upper end and the lower end of the adjacent guide plates and between the side walls of the first separation chamber, and the air flow from the air inlet can pass through the upper side and the lower side of the bearing plate, then flows upwards along the guide plates and finally enters the second separation chamber; the aggregates move downwards from the upper port of the first separation chamber and slide downwards along each bearing plate, and in the process of the movement of the airflow between the guide plate and the bearing plate, the aggregates with larger particle size and heavier weight continue to move downwards from the gap between the guide plate and the bearing plate due to gravity, and the aggregates with smaller particle size and lighter weight float upwards under the action of wind power and enter the second separation chamber together with the airflow. The aggregate can form thinner curtain form bed of material when following the downward landing in gap between each layer guide plate and the bearing board, receives the wind power effect to act on, can not separate the fender each other between the adjacent particulate matter, and the particulate matter is separated separately more easily, has effectively improved the separation effect, through screening the back step by step, the aggregate that the particle diameter is great, weight is heavier falls into the lower part of first separation chamber, and the particle diameter is less, the aggregate that weight is lighter falls into in the second separation chamber, accomplishes the sorting process.

The present invention in a preferred example may be further configured to: the bearing plates are parallel to each other.

Through adopting above-mentioned technical scheme, the air current that comes from the air intake can be followed bearing plate and is passed through at the uniform velocity, guarantees that wind speed equals in each wind channel, and wind-force is unanimous, guarantees to select separately the effect, if there is the slope or distortion in the bearing plate, can cause local wind speed too big or undersize in the wind channel, influences entire system's separation effect and sorting efficiency.

The present invention in a preferred example may be further configured to: the air inlet is arranged on the air inlet, the air outlet is arranged on the air inlet, the air inlet is arranged on the air outlet, the air outlet is arranged on the air outlet, the air inlet.

Through adopting above-mentioned technical scheme, when containing the great granule of particle diameter or feed speed when too fast in the aggregate, the aggregate is probably blocked between the gap of bearing board and guide plate lower extreme, lead to the unable normal whereabouts of aggregate, the aggregate card can upwards be piled up when this department, when the aggregate is contradicted proximity switch, proximity switch accepts the signal, give control system with the signal feedback, and through the action of relay control contactor, make vibrating motor open, under the vibrating motor effect, the aggregate between bearing board and the guide plate can the landing downwards, the normal whereabouts of aggregate has been guaranteed.

The present invention in a preferred example may be further configured to: the upper end of the first separation chamber is also provided with a feeding device which comprises

One end of the first buffer plate is fixed on one side wall of the first separation chamber, and the other end of the first buffer plate is arranged in a downward inclined mode;

one end of the second buffer plate is fixed on one side wall of the first separation chamber, which is opposite to the fixed end of the first buffer plate, the other end of the second buffer plate is arranged in a downward inclined mode, and the lower end of the second buffer plate is lower than the lower end of the first buffer plate;

the two ends of the rotating roller are respectively and rotatably connected to two opposite side walls of the first separation chamber and are positioned below the second buffer plate, the axis of the rotating roller is parallel to the lower side edge of the second buffer plate, and a gap is reserved between the peripheral surface of the rotating roller and the lower edge of the second buffer plate; and

and the power part is arranged on the outer wall of the first separation chamber, is connected with the rotary roller and is used for controlling the rotary roller to rotate.

Through adopting above-mentioned technical scheme, the aggregate firstly falls on first buffer board, then along first buffer board landing to the second buffer board downwards, again along the second buffer board landing to the outer peripheral face of commentaries on classics roller on, power part control commentaries on classics roller rotates, and the aggregate on the outer peripheral face of commentaries on classics roller rotates along with the commentaries on classics roller and falls on the bearing board of its below. In the process, the aggregates fall on the first buffer plate and the second buffer plate and can be uniformly scattered on the surfaces of the two plates, the first buffer plate and the second buffer plate play a role in uniformly distributing the aggregates and can also slow down the falling speed of the aggregates, and the effective time of the aggregates staying between each group of bearing plates and the guide plate is prolonged, so that the winnowing time is prolonged, and the winnowing effect is improved; the aggregate falls and can scatter along the outer peripheral face of commentaries on classics roller behind the commentaries on classics roller outer peripheral face, changes the roller and also plays further cloth effect, makes the aggregate of whereabouts be curtain form distribution, and the selection by winnowing effect is more abundant.

The present invention in a preferred example may be further configured to: the upper surfaces of the first buffer plate and the second buffer plate are provided with lining plates.

Through adopting above-mentioned technical scheme, fall on the welt when the aggregate whereabouts, and form the looks mutual friction between the welt, avoid aggregate and first buffer board and second buffer board direct contact, effectively protected first buffer board and second buffer board, prolonged its life.

The present invention in a preferred example may be further configured to: all wear to be equipped with the bolt on the welt, the bolt passes behind the welt and first buffer board or second buffer board threaded connection.

By adopting the technical scheme, the lining plate is convenient to mount and dismount and is convenient to replace.

The present invention in a preferred example may be further configured to: the feeding device also comprises a limiting plate arranged at the upper part of the first separation chamber;

and a gap for the aggregate to fall is formed between the limiting plate and the outer peripheral surface of the rotary roller.

Through adopting above-mentioned technical scheme, the limiting plate plays certain effect of blockking to the aggregate, and the aggregate can only follow the spacing and change the downward landing in the gap between the roller, has further guaranteed the whereabouts form of aggregate, has improved the selection by winnowing effect.

The present invention in a preferred example may be further configured to: the upper end of the limiting plate is rotatably connected with the side wall of the first separation chamber.

Through adopting above-mentioned technical scheme, when having great particulate matter in the aggregate, the particulate matter can produce the impact force to the limiting plate after the roller slip along changeing, and the limiting plate rotates because of the impact force effect of aggregate, turns into the kinetic energy of limiting plate, avoids the limiting plate to receive the impact for a long time and damages, has played effective guard action to the limiting plate.

The present invention in a preferred example may be further configured to: a wind shield is arranged in the second separation chamber;

the wind shield is connected between the two groups of parallel side walls of the second separation chamber and is arranged opposite to the air outlet.

Through adopting above-mentioned technical scheme, the effect wind speed that receives the deep bead reduces among the air current flow process, and the less impurity of particle diameter can paste the downward landing of deep bead to the bottom of second separation chamber, and gas is discharged from the air outlet, has avoided the air current directly to discharge from the air outlet, has guaranteed the separation effect.

The present invention in a preferred example may be further configured to: the second separation chamber is connected with a cyclone separator, and airflow can enter the cyclone separator through an air outlet.

Through adopting above-mentioned technical scheme, follow the indoor combustion gas of second separator and can obtain further purification in cyclone, impurity such as dust falls into cyclone bottom, and clean gas upwards discharges to the atmosphere in, has strengthened environmental protection effect.

In summary, the invention includes at least one of the following beneficial technical effects:

1. through the setting of multilayer bearing board and guide plate, can form thinner curtain form bed of material when the aggregate is along the downward landing in gap between each layer guide plate and the bearing board, receive the wind power effect and do not keep off each other between the adjacent particulate matter, the particulate matter is separated separately more easily, effectively improved the separation effect, after screening step by step, the particle diameter is great, the aggregate that weight is heavier falls into the lower part of first separating chamber, the particle diameter is less, the aggregate that weight is lighter falls into in the second separating chamber, accomplish the sorting process.

2. The cooperation of proximity switch and vibrating motor can avoid the aggregate to take place to block up, guarantees the normal whereabouts of aggregate.

3. The feeding device can reduce the falling speed of the aggregate, and simultaneously, the aggregate is uniformly scattered to form a curtain-shaped material layer, so that the winnowing effect is enhanced.

Drawings

Fig. 1 is a schematic overall structure diagram according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the internal structure of the first separation chamber and the second separation chamber in fig. 1.

Fig. 3 is a front view of fig. 2.

Fig. 4 is a partially enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a schematic view showing the feeding device of fig. 2 and its connection with the first separation chamber.

In the figure, 1, a first separation chamber; 11. an air inlet; 12. a wind net; 21. a support plate; 22. a baffle; 23. a proximity switch; 24. a vibration motor; 3. a second separation chamber; 31. an air outlet; 32. a wind deflector; 4. a feeding device; 41. a first buffer plate; 42. a second buffer plate; 43. rotating the roller; 44. a power section; 45. a liner plate; 46. a bolt; 47. a limiting plate; 5. a cyclone separator.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, a concrete dry aggregate winnowing system disclosed as an embodiment of the present invention includes a first separating chamber 1 and a second separating chamber 3 disposed to communicate with the first separating chamber 1.

Referring to fig. 2 and 3, a support plate 21 and a guide plate 22 are arranged in the first separation chamber 1, the support plate 21 is provided with a plurality of groups, and the groups are respectively and fixedly connected between two groups of parallel side walls of the first separation chamber 1, and the groups of support plates 21 are arranged along the vertical direction in a staggered manner from top to bottom; an air inlet 11 corresponding to the bearing plate 21 is formed in one side wall of the first separation chamber 1, specifically, the bearing plate 21 is obliquely arranged, and one end close to the air inlet 11 is higher than the other end.

The guide plates 22 are provided with a plurality of groups and are respectively and fixedly connected between two groups of parallel side walls of the first separation chamber 1, the guide plates 22 are consistent in quantity and correspond to the bearing plates 21 one by one, and gaps are formed between the lower end parts of the guide plates 22 and the lower end parts of the bearing plates 21.

An air outlet 31 is formed in the upper portion of a side wall of the second separating chamber 3 opposite to the air inlet 11. In practical application, a fan is required to be installed at the outer side of the air inlet 11, air flow is blown into the first separation chamber 1, and an air net 12 is further installed at the air inlet 11 in order to form a uniform air curtain at the inner side of the air inlet 11.

It should be noted that air ducts for air to pass through are formed between adjacent air deflectors 22, between the air deflectors 22 at the upper and lower ends and the side wall of the first separation chamber 1, and the air from the air inlet 11 can pass through the upper and lower sides of the support plate 21, then flow upward along the air deflectors 22, and finally enter the second separation chamber 3; the aggregates move downwards from the upper port of the first separation chamber 1 and slide downwards along each bearing plate 21, the aggregates with larger particle size and heavier weight continue to move downwards from the gap between the guide plate 22 and the bearing plate 21 due to gravity in the process of the air flow moving between the guide plate 22 and the bearing plate 21, and the aggregates with smaller particle size and lighter weight float upwards under the action of wind power and enter the second separation chamber 3 together with the air flow. The aggregate can form thinner curtain form bed of material when following the downward landing in gap between each layer guide plate 22 and the bearing board 21, receive the wind effect to act on, can not separate each other between the adjacent particulate matter and keep off, the particulate matter is separated from the branch more easily, has effectively improved the separation effect, through screening the back step by step, the particle diameter is great, the aggregate that weight is heavier falls into the lower part of first separating chamber 1, the particle diameter is less, the aggregate that weight is lighter falls into in second separating chamber 3, accomplish the sorting process.

Referring to fig. 2 and 3, the supporting plates 21 are arranged in parallel, and the airflow from the air inlet 11 can pass through the supporting plates 21 at a constant speed, so that the wind speeds in the air channels are equal, the wind power is consistent, and the sorting effect is ensured.

A proximity switch 23 is fixedly installed on the surface of one side of the air deflector 22 opposite to the air inlet 11, a vibration motor 24 is fixedly installed on the surface of one side of the supporting plate 21 departing from the air deflector 22, and the proximity switch 23 is electrically connected with the vibration motor 24. Specifically, in actual operation, wire slots can be formed in the guide plate 22 and the inner wall of the first separation chamber 1, a circuit is arranged in the wire slots in a penetrating manner, one end of the circuit is connected with the proximity switch 23, and the other end of the circuit is connected with the vibration motor 24.

When the aggregate contains the bigger granule of particle diameter or feed speed is too fast, the aggregate is probably blocked between the gap of bearing board 21 and guide plate 22 lower extreme, lead to the unable normal whereabouts of aggregate, the aggregate card can upwards be piled up when this department, when the aggregate contradicts proximity switch 23, proximity switch 23 accepts the signal, feed back the signal to control system, and through the action of relay control contactor, make vibrating motor 24 open, under the effect of vibrating motor 24, the aggregate between bearing board 21 and guide plate 22 can the landing downwards, the normal whereabouts of aggregate has been guaranteed.

Referring to fig. 3, the direction that the arrow in the figure points to is the air current flow direction, be provided with a plurality of deep beads 32 in the second separation chamber 3, deep bead 32 fixed connection is between two sets of parallel lateral walls of second separation chamber 3, set up relatively with air outlet 31, wherein the deep bead 32 is provided with a plurality ofly, be located the flow path of air current respectively, the air current upwards flows along guide plate 22, then turn to the horizontal direction, flow to air outlet 31 one side, receive the effect wind speed reduction of deep bead 32, the less impurity of particle diameter can paste the downward landing of deep bead 32 to the bottom of second separation chamber 3, and gas is discharged from air outlet 31, avoided the air current directly to discharge from air outlet 31, the sorting effect has been guaranteed.

The one end of second separator 3 still is equipped with cyclone 5, cyclone 5's input port and air outlet 31 fixed connection, and the gas of discharging can obtain further purification in cyclone 5 in second separator 3, and impurity such as dust falls into cyclone 5 bottom, and clean gas upwards discharges to the atmosphere in, has strengthened environmental protection effect.

Referring to fig. 3, 4 and 5, the upper port of the first separation chamber 1 is further provided with a feeding device 4, the feeding device 4 comprises a first buffer plate 41, a second buffer plate 42, a rotating roller 43 and a power part 44, one end of the first buffer plate 41 is fixed on one side wall of the first separation chamber 1, and the other end is a free end and is arranged in a downward inclination manner; one end of the second buffer plate 42 is fixed on a side wall opposite to the fixed end of the first buffer plate 41, and the other end is also a free end and is arranged obliquely downwards, wherein, in the vertical direction, the first buffer plate 41 and the second buffer plate 42 are arranged in a staggered manner, and the lower end of the second buffer plate 42 is lower than the lower end of the first buffer plate 41; two ends of the rotating roller 43 are rotatably connected with two opposite side walls of the first separation chamber 1, the rotating roller 43 is arranged close to the lower side of the second buffer plate 42, the axis of the rotating roller 43 is parallel to the lower side of the second buffer plate 42, and a gap is reserved between the peripheral surface of the rotating roller 43 and the lower side of the second buffer plate 42; the power section 44 is fixed to the outer wall of the first separation chamber 1 and is connected to the roller 43.

The aggregates fall on the first buffer plate 41 firstly, then slide down along the first buffer plate 41 to the second buffer plate 42, and then slide down along the second buffer plate 42 to the outer circumferential surface of the rotating roller 43, the power part 44 controls the rotating roller 43 to rotate, and the aggregates on the outer circumferential surface of the rotating roller 43 fall on the supporting plate 21 below the rotating roller 43 along with the rotation of the rotating roller 43. In the process, the aggregates fall on the first buffer plate 41 and the second buffer plate 42 and can be uniformly scattered on the surfaces of the two plates, the first buffer plate 41 and the second buffer plate 42 play a role in uniform distribution and can also slow down the falling speed of the aggregates, and the retention effective time of the aggregates between each group of bearing plates 21 and each group of guide plates 22 is prolonged, so that the air separation time is prolonged, and the air separation effect is improved; the aggregates fall on the outer peripheral surface of the rotating roller 43 and then scatter along the outer peripheral surface of the rotating roller 43, the rotating roller 43 also plays a further role in distributing, so that the falling aggregates are distributed in a curtain shape, and the winnowing effect is more sufficient.

Referring to fig. 4, further, the upper portion of first separating chamber 1 still is equipped with limiting plate 47, and limiting plate 47 is located the below of first buffer board 41, and is located one side of changeing roller 43, is vertical state setting, leaves the clearance between limiting plate 47 and the outer peripheral face of changeing roller 43, and limiting plate 47 plays certain effect of blockking to the aggregate, and the aggregate can only follow limiting plate 47 and change the downward landing in gap between the roller 43, has further guaranteed the whereabouts form of aggregate, has improved the selection by winnowing effect.

Limiting plate 47's upper end is rotated and is connected between the both sides wall of first separator 1, and when there was great particulate matter in the aggregate, the particulate matter can produce the impact force to limiting plate 47 after following the roller 43 slip, and limiting plate 47 rotates because of the impact force effect of aggregate, turns into limiting plate 47's kinetic energy, avoids limiting plate 47 to receive the impact and damages for a long time, has played effective guard action to limiting plate 47.

In order to alleviate the impact of aggregate to first buffer board 41 and second buffer board 42, be provided with welt 45 respectively at the upper surface of first buffer board 41 and second buffer board 42, fall on welt 45 when the aggregate whereabouts, form friction each other between 45 with the welt, avoid aggregate and first buffer board 41 and second buffer board 42 direct contact, effectively protected first buffer board 41 and second buffer board 42, prolonged its life.

Further, all wear to be equipped with bolt 46 on welt 45, offer on first buffer board 41 and the second buffer board 42 with bolt 46 complex thread groove or screw hole, welt 45 is connected with first buffer board 41 and second buffer board 42 through bolt 46. The lining plate 45 is convenient to install and detach, and the lining plate 45 is convenient to replace.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a concrete drying aggregate air classification system which characterized in that: comprises that

The upper end of the first separation chamber (1) is provided with an opening, and an air inlet (11) is formed in one side wall;

the multiple groups of obliquely arranged bearing plates (21) are connected between the two groups of parallel side walls of the first separation chamber (1), the bearing plates (21) are sequentially arranged in a staggered manner from top to bottom, and aggregate can slide down along each bearing plate (21) layer by layer;

a plurality of groups of vertically arranged guide plates (22) are connected between two groups of parallel side walls of the first separation chamber (1) and correspond to the bearing plates (21) one by one, and gaps for aggregates to fall are reserved between the lower ends of the guide plates (22) and the bearing plates (21); and

the second separation chamber (3) is communicated with the first separation chamber (1), and an air outlet (31) is formed in one side wall of the second separation chamber (3) opposite to the air inlet (11);

the bearing plate (21) is positioned between the guide plate (22) and the air inlet (11), and air flow from the air inlet (11) can pass through the upper side and the lower side of the bearing plate (21) and upwards enter the second separation chamber (3) along the guide plate (22).

2. The concrete dry aggregate winnowing system of claim 1, wherein: the bearing plates (21) are parallel to each other.

3. The concrete dry aggregate winnowing system of claim 1, wherein: the air conditioner is characterized in that a proximity switch (23) is arranged on the surface of one side, opposite to the air inlet (11), of the guide plate (22), a vibration motor (24) is arranged on the surface of one side, deviating from the guide plate (22), of the supporting plate (21), and the proximity switch (23) is electrically connected with the vibration motor (24).

4. The concrete dry aggregate winnowing system of claim 1, wherein: the upper end of the first separation chamber (1) is also provided with a feeding device (4), and the feeding device (4) comprises

A first buffer plate (41) having one end fixed to one side wall of the first separation chamber (1) and the other end inclined downward;

one end of the second buffer plate (42) is fixed on one side wall of the first separation chamber (1) opposite to the fixed end of the first buffer plate (41), the other end of the second buffer plate is arranged in a downward inclined mode, and the lower end of the second buffer plate (42) is lower than the lower end of the first buffer plate (41);

the two ends of the rotating roller (43) are respectively and rotatably connected to two opposite side walls of the first separation chamber (1) and positioned below the second buffer plate (42), the axis of the rotating roller (43) is parallel to the lower side edge of the second buffer plate (42), and a gap is reserved between the outer peripheral surface of the rotating roller (43) and the lower edge of the second buffer plate (42); and

and the power part (44) is arranged on the outer wall of the first separation chamber (1), is connected with the rotating roller (43) and is used for controlling the rotating roller (43) to rotate.

5. The concrete drying aggregate winnowing system of claim 4, wherein: and lining plates (45) are arranged on the upper surfaces of the first buffer plate (41) and the second buffer plate (42).

6. The concrete drying aggregate winnowing system of claim 5, wherein: all wear to be equipped with bolt (46) on welt (45), bolt (46) pass welt (45) back and first buffer board (41) or second buffer board (42) threaded connection.

7. The concrete drying aggregate winnowing system of claim 4, wherein: the feeding device (4) also comprises a limiting plate (47) arranged at the upper part of the first separation chamber (1);

a gap for falling aggregates is formed between the limiting plate (47) and the outer peripheral surface of the rotating roller (43).

8. The concrete drying aggregate winnowing system of claim 7, wherein: the upper end of the limiting plate (47) is rotatably connected with the side wall of the first separation chamber (1).

9. A concrete drying aggregate air classification system according to any one of claims 1 to 8, characterized in that: a wind shield (32) is arranged in the second separation chamber (3);

and the wind shield (32) is connected between two groups of parallel side walls of the second separation chamber (3) and is arranged opposite to the air outlet (31).

10. The concrete drying aggregate winnowing system of claim 9, wherein: the second separation chamber (3) is connected with a cyclone separator (5), and airflow can enter the cyclone separator (5) through an air outlet (31).