Concrete aggregate screening device

Abstract

The invention discloses a concrete aggregate screening device, and relates to the technical field of concrete aggregate screening. The concrete aggregate screening device comprises a screening box, a spraying mechanism, an air blowing mechanism and a screening plate, a screening space is formed in the screening box, the top of the screening box is provided with a feeding port and a spraying port which are arranged in a spaced mode, and the feeding port and the spraying port both communicate with the screening space; an air inlet communicating with the screening space is formed in the side wall of the screening box, and the feeding opening is formed between the spraying opening and the air inlet; the spraying mechanism is mounted at the top of the screening box corresponding to the position of the spraying opening; the blowing mechanism is mounted on one side of the screening box corresponding to the position of the air inlet; the screening plate is obliquely arranged in the screening space. Through the synergistic effect of the spraying mechanism, the air blowing mechanism and the screening plate, the separation efficiency and the purification effect of various different impurities in concrete aggregate are improved, and the problem of dust dissipation in a traditional concrete aggregate screening technology is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete aggregate screening, and in particular to a concrete aggregate screening device. Background Art

[0002] As the basic material of concrete engineering, the quality of concrete aggregate plays an important role in the overall quality of the project. In order to meet the high-standard construction requirements, the screening and impurity removal technology of concrete aggregate has also undergone continuous optimization and improvement. From the early manual screening to the development of modern mechanical screening systems, screening technology has gradually turned to automation and precision to improve screening efficiency and the purity of aggregates.

[0003] At present, the screening and impurity removal of concrete aggregates usually adopts vibrating screen and fluidized bed technology. The vibrating screen uses mechanical vibration to make the aggregate pass through a screen with a specific aperture to remove large particles of impurities; while the fluidized bed technology separates light impurities from the aggregate through air flow.

[0004] However, the traditional concrete aggregate screening and impurity removal technology is not ideal when dealing with the coexistence of multiple impurities, and is often accompanied by the problem of dust emission. Summary of the invention

[0005] The main purpose of the present invention is to provide a concrete aggregate screening device, which aims to solve the technical problems of unsatisfactory effect and dust emission of traditional concrete aggregate screening and impurity removal technology in dealing with the coexistence of multiple impurities.

[0006] To achieve the above-mentioned purpose, the concrete aggregate screening device proposed in the present invention comprises: A screening box, wherein a screening space is formed in the screening box, a feed port and a spray port are provided at intervals on the top of the screening box, the feed port and the spray port are both connected to the screening space, and the spray port is arranged near the edge of the screening box; an air inlet connected to the screening space is provided on the side wall of the screening box, and the feed port is arranged between the spray port and the air inlet; A spray mechanism, the spray mechanism being installed on the top of the screening box at a position corresponding to the spray port; A blower mechanism, the blower mechanism being installed on one side of the screening box at a position corresponding to the air inlet; A screening plate, wherein the screening plate is obliquely arranged in the screening space, the top end of the screening plate is arranged below the feed port, the bottom end of the screening plate is arranged below the air inlet, and a first material passing gap is provided between the bottom end of the screening plate and the inner wall of the screening box; a plurality of screening holes are provided on the screening plate, and the screening plate is used to screen impurities in the concrete aggregate so that the impurities fall through the plurality of screening holes; the blowing mechanism is used to blow the impurities toward the spraying mechanism; and the spraying mechanism is used to spray the impurities.

[0007] In one embodiment, the spray mechanism includes a water tank and a spray head. The water tank is installed on the top of the screening box. One side of the water tank is connected to an external water pump through a water supply pipe. The bottom of the water tank is connected to the spray head. The spray head extends into the screening space through the spray port, and the spray head is arranged downward.

[0008] In one embodiment, a sewage collecting box is installed at the bottom of the screening box, and the sewage collecting box is arranged below the spray head. The sewage collecting box has a rectangular structure, and the side walls of the screening box are bent inward to form a sewage outlet adapted to the sewage collecting box, and the screening space is connected to the sewage collecting box through the sewage outlet.

[0009] In one embodiment, a guide plate is further provided in the screening space, and the guide plate is provided between the sewage collecting box and the screening plate, and a sewage discharge gap is provided between the guide plate and the screening plate. The guide plate is inclined, and the bottom end of the guide plate is provided close to the top end of the sewage collecting box, and the top end of the guide plate is provided close to the bottom end of the screening plate, and a second material passing gap is provided between the top end of the guide plate and the inner wall of the screening box.

[0010] In one embodiment, the bottom end of the guide plate is disposed below the shower head.

[0011] In one embodiment, the second feed gap is larger than the first feed gap.

[0012] In one embodiment, the blowing mechanism includes a base, a fan and a ventilation duct, the ventilation duct is installed on one side of the screening box corresponding to the position of the air inlet, the base and the screening box are spaced apart, the fan is installed on the base, and the air outlet end of the fan is connected to the air inlet through the ventilation duct.

[0013] In one embodiment, a discharge port communicating with the screening space is provided at the bottom of the screening box.

[0014] In one embodiment, a distribution plate is further provided in the screening space, and the distribution plate is obliquely arranged below the screening plate, the bottom end of the distribution plate is arranged close to the discharge port, the top end of the distribution plate is arranged upward in a direction away from the discharge port, and a plurality of distribution holes are opened on the distribution plate.

[0015] In one embodiment, the concrete aggregate screening device further includes a conveying line, and the conveying line is arranged below the discharge port.

[0016] The technical solution of the present invention effectively removes impurities in concrete aggregates through the synergistic effect of the spray mechanism, the blower mechanism and the screening plate. In this process, the blower mechanism blows light impurities to the spray area by guiding the airflow, and at the same time promotes the movement of aggregates on the screening plate to prevent the clogging of the screening holes; the spray mechanism uses water flow to effectively capture and remove impurities in the concrete aggregates blown out by the blower mechanism, reducing the risk of dust diffusion; the screening plate is tilted so that the concrete aggregates can slide smoothly downward under the combined effect of gravity and the airflow blown out by the blower mechanism, and further separate impurities through the screening holes, and can handle impurities of various qualities. It not only improves the separation efficiency and purification effect of various impurities in concrete aggregates, but also effectively solves the problem of dust escape in traditional concrete aggregate screening technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a concrete aggregate screening device provided by the present invention; Figure 2 A schematic diagram of the explosion structure of an embodiment of a concrete aggregate screening device provided by the present invention; Figure 3 A schematic diagram of the installation structure of an embodiment of a sewage collection box provided by the present invention; Figure 4 This is a schematic structural diagram of an embodiment of a conveyor line provided by the present invention.

[0019] Description of Figure Numbers: 100, screening box; 101, screening space; 102, feed port; 103, spray port; 104, air inlet; 105, sewage outlet; 106, discharge port; 200, spray mechanism; 210, water tank; 220, spray head; 230, water supply pipe; 300, air blowing mechanism; 310, base; 320, fan; 330, ventilation duct; 400, screening plate; 401, screening hole; 500, sewage collection box; 600, guide plate; 700, distribution plate; 701, distribution hole; 800, conveyor line.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] At present, the screening and impurity removal of concrete aggregates usually adopts vibrating screen and fluidized bed technology. The vibrating screen uses mechanical vibration to make the aggregate pass through a screen with a specific aperture to remove large particles of impurities; while the fluidized bed technology separates light impurities from the aggregate through air flow.

[0025] However, the traditional concrete aggregate screening and impurity removal technology is not ideal when dealing with the coexistence of multiple impurities, and is often accompanied by the problem of dust emission.

[0026] In order to solve the technical problem, the present invention provides a concrete aggregate screening device.

[0027] See also Figures 1 to 3 In one embodiment of the present invention, the concrete aggregate screening device includes a screening box 100, a spray mechanism 200, an air blowing mechanism 300 and a screening plate 400. A screening space 101 is formed in the screening box 100. A feed port 102 and a spray port 103 are provided at intervals on the top of the screening box 100. Both the feed port 102 and the spray port 103 are connected to the screening space 101. The spray port 103 is arranged near the edge of the screening box 100. An air inlet 104 connected to the screening space 101 is provided on the side wall of the screening box 100. The feed port 102 is arranged between the spray port 103 and the air inlet 104. The spray mechanism 200 is installed on the screening plate 400 at a position corresponding to the spray port 103. The top of the screening box 100; the air blowing mechanism 300 is installed on one side of the screening box 100 corresponding to the position of the air inlet 104; the screening plate 400 is tiltedly arranged in the screening space 101, the top of the screening plate 400 is arranged below the feed inlet 102, the bottom of the screening plate 400 is arranged below the air inlet 104, and a first material passing gap is provided between the bottom end of the screening plate 400 and the inner wall of the screening box 100; a plurality of screening holes 401 are provided on the screening plate 400, and the screening plate 400 is used to screen impurities in concrete aggregate so that the impurities fall through the plurality of screening holes 401; the air blowing mechanism 300 is used to blow impurities toward the spraying mechanism 200; the spraying mechanism 200 is used to spray impurities.

[0028] Specifically, a partially enclosed screening space 101 is formed inside the screening box 100, providing a physical boundary and operating space for the entire screening process. The feed port 102 and the spray port 103 arranged at the top of the screening box 100 are used to receive untreated concrete aggregate and spray water source, respectively, so that the concrete aggregate and the spray water source can be continuously or intermittently supplied to the screening space 101. The feed port 102 at the top of the screening box 100 is arranged in the area between the spray port 103 and the air inlet 104, ensuring that the concrete aggregate can be preferentially processed by the air blowing mechanism 300 in the process of falling to the screening plate 400, thereby improving the impurity removal effect of the concrete aggregate. The spray port 103 is located at the edge of the screening box 100. Through the action of the water flow, impurities can be effectively captured and discharged from the screening space 101 with the water flow.

[0029] The spray mechanism 200 corresponds to the spray port 103 and is fixed to the top of the screening box 100. Its function is to absorb and capture the dust blown by the air blowing mechanism 300 by spraying water while the concrete aggregate is being screened, thereby reducing the risk of dust diffusion. And through the guide airflow blown by the air blowing mechanism 300 during the screening process, the light impurities in the concrete aggregate can be blown to the spray area, accelerating the removal of impurities and preventing dust from being suspended in the screening space 101. In addition, the air blowing mechanism 300 can cause the concrete aggregate to move moderately on the screening plate 400 to prevent the screening holes 401 from being blocked.

[0030] The screening plate 400 is tiltedly arranged inside the screening box 100, ensuring that the concrete aggregate can slide down along the screening plate 400 under the action of gravity and the wind force of the blowing mechanism 300 after feeding. The top of the screening plate 400 is arranged below the feed port 102, ensuring that the concrete aggregate directly enters the screening path of the screening plate 400. The bottom of the screening plate 400 is arranged below the air inlet 104, further promoting the removal of light particles in the concrete aggregate. The screening holes 401 on the screening plate 400 are used for heavier small-sized impurities to perforate and fall, so that the screened pure concrete aggregate falls into the subsequent processing area through the first material passing gap under the action of gravity.

[0031] In the technical solution provided by the present invention, impurities in concrete aggregate are efficiently removed through the synergistic effect of the spray mechanism 200, the blower mechanism 300 and the screening plate 400. In this process, the blower mechanism 300 blows light impurities to the spray area by guiding the airflow, and at the same time promotes the movement of aggregates on the screening plate 400 to prevent the screening hole 401 from being blocked; the spray mechanism 200 uses water flow to effectively capture and remove impurities in the concrete aggregate blown out by the blower mechanism 300, reducing the risk of dust diffusion; the screening plate 400 is tilted to allow the concrete aggregate to slide smoothly downward under the combined effect of gravity and the airflow blown out by the blower mechanism 300, and further separate impurities through the screening hole 401, and can handle a variety of impurities of different qualities. Not only does it improve the separation efficiency and purification effect of various impurities in concrete aggregate, but it also effectively solves the problem of dust escape in traditional concrete aggregate screening technology.

[0032] Please continue reading Figures 1 to 3 In an embodiment of the present invention, the spray mechanism 200 includes a water tank 210 and a spray head 220. The water tank 210 is installed on the top of the screening box 100. One side of the water tank 210 is connected to an external water pump through a water supply pipe 230. The bottom of the water tank 210 is connected to the spray head 220. The spray head 220 extends into the screening space 101 through the spray port 103, and the spray head 220 is set downward.

[0033] Specifically, the spray mechanism 200 includes a water tank 210 and a spray head 220, which are used to store and transport water. The water tank 210 is installed on the top of the screening box 100, and has a height higher than the spray head 220, so as to use gravity pressure to push the water to the spray head 220. It is ensured that the water can be supplied to the spray head 220, ensuring the continuity of the spraying process.

[0034] One side of the water tank 210 is connected to an external water pump through a water supply pipe 230. The water pump is responsible for delivering external water to the water tank 210 to achieve timely water replenishment of the water tank 210 so that the spray mechanism 200 can still maintain sufficient water reserves during long-term operation.

[0035] The bottom of the water tank 210 is connected to the spray head 220, and the water flows directly into the spray head 220 through this connection point, without the need for an intermediate link to adjust or increase the water pressure, which simplifies the entire transmission process and helps reduce the complexity and failure rate of the equipment. The spray head 220 is set at the spray port 103, so that the water flow can continue to fall vertically in the screening space 101 to form a water curtain to adhere to the granular impurities and dust impurities blown out by the blower mechanism 300.

[0036] The spray mechanism 200 ensures that the spray process can be continuously performed before and after the entire screening process begins, thereby reducing dust generation.

[0037] Please continue reading Figures 1 to 3 In an embodiment of the present invention, a sewage collecting box 500 is installed at the bottom of the screening box 100. The sewage collecting box 500 is arranged below the spray head 220. The sewage collecting box 500 has a rectangular structure. The side wall of the screening box 100 is bent inward to form a sewage outlet 105 adapted to the sewage collecting box 500. The screening space 101 is connected to the sewage collecting box 500 through the sewage outlet 105.

[0038] Specifically, a sewage collection box 500 is installed at the bottom of the screening box 100, and the sewage collection box 500 is arranged directly below the spray head 220 to ensure that the spray water can directly enter the sewage collection box 500 for collection after being acted upon by gravity and inertia. The sewage collection box 500 has a rectangular structure, which achieves a good balance between volume utilization and installation stability. The rectangular shape facilitates effective installation with the bottom space of the screening box 100, while maximizing its carrying capacity to handle a large amount of spray water and entrained impurities and waste.

[0039] In order to ensure that the sewage can smoothly enter the sewage collection box 500 from the screening space 101, the side wall of the screening box 100 in this embodiment is bent inward to form a sewage outlet 105 structure that matches the shape of the sewage collection box 500. The existence of the sewage outlet 105 allows the sewage to be guided to the sewage collection box 500 in a clear direction during the natural flow process, reducing the problems of water accumulation and overflow caused by the blocked sewage discharge path.

[0040] Please continue reading Figure 2 In an embodiment of the present invention, a guide plate 600 is further provided in the screening space 101. The guide plate 600 is provided between the sewage collecting box 500 and the screening plate 400. There is a sewage discharge gap between the guide plate 600 and the screening plate 400. The guide plate 600 is inclined. The bottom end of the guide plate 600 is provided close to the top end of the sewage collecting box 500. The top end of the guide plate 600 is provided close to the bottom end of the screening plate 400. There is a second material passing gap between the top end of the guide plate 600 and the inner wall of the screening box 100.

[0041] Specifically, an inclined guide plate 600 is added in the screening space 101 to further receive the heavier impurities screened and dropped from the screening plate 400 and guide them to the sewage collection box 500. The heavier impurities screened and dropped from the screening plate 400 can be naturally and quickly guided into the sewage collection box 500 by the effect of gravity and inertial motion.

[0042] A drainage gap is formed between the guide plate 600 and the screening plate 400 to prevent blockage or retention during the material passing process between the guide plate 600 and the screening plate 400. In addition, a second material passing gap is provided between the top of the guide plate 600 and the inner wall of the screening box 100 to prevent the screened pure concrete aggregate from being blocked when it falls into the subsequent processing area under the action of gravity after passing through the first material passing gap.

[0043] In the embodiment of the present invention, the bottom end of the guide plate 600 is disposed below the shower head 220 .

[0044] Specifically, when the spray water is sprinkled from above, it can be guided by the guide plate 600, so that the impurities on the guide plate 600 are directly flushed into the sewage collection box 500, avoiding the accumulation of solid impurities at the bottom of the guide plate 600 and reducing the solid impurity screening efficiency. The guide plate 600 can also guide the spray water carrying dust impurities into the sewage collection box 500.

[0045] In an embodiment of the present invention, the second material transfer gap is larger than the first material transfer gap.

[0046] Specifically, the first material passing gap is small, ensuring that the pure concrete aggregate can fall into the second material passing gap at a relatively stable and controllable speed, and can effectively prevent the pure concrete aggregate from accumulating and blocking at the bottom end of the screening plate 400 .

[0047] Relatively speaking, the larger second material gap allows the screened pure concrete aggregate to pass freely without obstruction and fall into the subsequent processing area. This prevents the accumulation of pure concrete aggregate and unnecessary reverse flow, allowing the purified concrete aggregate to enter the next processing stage uninterruptedly, enhancing the smoothness of the entire screening process.

[0048] Please continue reading Figures 1 to 3 In an embodiment of the present invention, the air blowing mechanism 300 includes a base 310, a fan 320 and a ventilation duct 330. The ventilation duct 330 is installed on one side of the screening box 100 corresponding to the position of the air inlet 104. The base 310 is spaced apart from the screening box 100. The fan 320 is installed on the base 310. The air outlet end of the fan 320 is connected to the air inlet 104 through the ventilation duct 330.

[0049] Specifically, the ventilation duct 330 is installed on one side of the screening box 100, directly corresponding to the position of the air inlet 104, so that the airflow blown by the fan 320 can quickly enter the screening box 100. A gap is set between the base 310 and the screening box 100 to reduce interference and vibration between devices, ensure that the fan 320 maintains stability during operation, and does not affect the working environment inside the screening box 100. The fan 320 is installed on the base 310, and its air outlet is connected to the air inlet 104 through the ventilation duct 330. The airflow generated by the fan 320 can be effectively guided into the screening box 100 through the ventilation duct 330 and the air inlet 104 to ensure the directionality and stability of the airflow, so that it can fully act on the concrete aggregate screening area on the screening plate 400.

[0050] This embodiment realizes a closed path from the generation of airflow to the introduction of airflow into the screening space 101 by connecting the air outlet of the fan 320 with the ventilation duct 330, which not only improves the concentration of airflow, but also avoids unnecessary loss of airflow energy. The fan 320 is installed on the base 310, forming a relatively isolated structure with the screening box 100, so that the impact of the vibration of the fan 320 on the screening box 100 is minimized, further ensuring the stability and reliability of the operation of the screening device. It ensures that the airflow generated by the fan 320 can be effectively transmitted to the screening space 101, and in the process, accurate and powerful blowing force is applied to the target impurities, forming effective cooperation with the spray system, enhancing the removal effect of impurities, and reducing dust.

[0051] In the embodiment of the present invention, a discharge port 106 communicating with the screening space 101 is provided at the bottom of the screening box 100 .

[0052] Specifically, a discharge port 106 is provided at the bottom of the screening box 100, and the discharge port 106 is connected to the screening space 101, and is responsible for discharging the pure concrete aggregate after screening and cleaning. It ensures that the concrete aggregate can flow out of the equipment smoothly after completing the entire screening process, and avoids the backlog or stagnation of the concrete aggregate in the screening space 101. The screened concrete aggregate moves downward naturally under the action of gravity, and the arrangement of the discharge port 106 conforms to this movement path. The screened concrete aggregate falls to the bottom of the screening box 100 through the first feeding gap and the second feeding gap, and is finally discharged from the equipment through the discharge port 106. The retention time of the material in the screening box 100 is reduced, and the screening efficiency of the concrete aggregate is improved. Moreover, the setting of the discharge port 106 is consistent with the gravity flow direction in the screening box 100, which makes the most of the natural flow characteristics of the material, reduces the demand for mechanical conveying devices, and reduces energy consumption.

[0053] In an embodiment of the present invention, a distribution plate 700 is further provided in the screening space 101. The distribution plate 700 is obliquely arranged below the screening plate 400. The bottom end of the distribution plate 700 is arranged close to the discharge port 106. The top end of the distribution plate 700 is arranged upward in a direction away from the discharge port 106. A plurality of distribution holes 701 are provided on the distribution plate 700.

[0054] Please continue reading Figure 2 Specifically, a distribution plate 700 is added in the screening space 101. It is used to optimize the distribution and flow rate of pure concrete aggregates, making the entire concrete aggregate screening process more efficient and balanced. The distribution plate 700 is embedded in the screening space 101 and is tilted below the screening plate 400 and below the guide plate 600, aiming to improve the distribution of pure concrete aggregates. It conforms to the natural flow direction of pure concrete aggregates and maximizes the use of gravity.

[0055] The top of the distribution plate 700 is tilted upward in a direction away from the discharge port 106. When the aggregate slides downward under the action of gravity, it will not flow out directly from the discharge port 106 quickly, but will be distributed again under the guidance of the distribution plate 700. The flow rate and direction of the pure concrete aggregate can be effectively controlled to avoid local blockage caused by too fast flow, and at the same time provide preparation time for the screening process of the screening plate 400.

[0056] The distribution plate 700 can be set to different sizes according to the particle size of the pure concrete aggregate, and the distribution holes 701 can enhance the secondary screening efficiency of the distribution plate 700 for the pure concrete aggregates with different particle sizes.

[0057] Please continue reading Figures 1 to 3 , and see Figure 4In an embodiment of the present invention, the concrete aggregate screening device further includes a conveying line 800 , and the conveying line 800 is disposed below the discharge port 106 .

[0058] It should be noted that the conveyor line 800 is a belt conveyor, a chain conveyor or a roller conveyor in the prior art.

[0059] Specifically, the concrete aggregate screening device further integrates a conveyor line 800, which is installed below the discharge port 106 of the screening box 100. It is used to ensure that the clean concrete aggregate after screening can be smoothly and efficiently transported to the next process link. The conveyor line 800 is arranged below the discharge port 106 to directly receive and move the clean concrete aggregate. When the clean concrete aggregate falls from the discharge port 106 due to gravity, it can fall directly on the conveyor line 800, avoiding the scattering and accumulation of materials. At the same time, the connection of the conveyor line 800 allows the discharged clean concrete aggregate to be quickly and orderly delivered, realizing the continuous transportation of the clean concrete aggregate.

[0060] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A concrete aggregate screening device, characterized in that: include: A screening box, wherein a screening space is formed in the screening box, a feed port and a spray port are provided at intervals on the top of the screening box, the feed port and the spray port are both connected to the screening space, and the spray port is arranged near the edge of the screening box; an air inlet connected to the screening space is provided on the side wall of the screening box, and the feed port is arranged between the spray port and the air inlet; A spray mechanism, the spray mechanism being installed on the top of the screening box at a position corresponding to the spray port; A blower mechanism, the blower mechanism being installed on one side of the screening box at a position corresponding to the air inlet; A screening plate, wherein the screening plate is obliquely arranged in the screening space, the top end of the screening plate is arranged below the feed port, the bottom end of the screening plate is arranged below the air inlet, and a first material passing gap is provided between the bottom end of the screening plate and the inner wall of the screening box; a plurality of screening holes are provided on the screening plate, and the screening plate is used to screen impurities in the concrete aggregate so that the impurities fall through the plurality of screening holes; the blowing mechanism is used to blow the impurities toward the spraying mechanism; and the spraying mechanism is used to spray the impurities.

2. The concrete aggregate screening device according to claim 1, characterized in that: The spray mechanism includes a water tank and a spray head. The water tank is installed on the top of the screening box. One side of the water tank is connected to an external water pump through a water supply pipe. The bottom of the water tank is connected to the spray head. The spray head extends into the screening space through the spray port, and the spray head is arranged downward.

3. The concrete aggregate screening device according to claim 2, characterized in that: A sewage collecting box is installed at the bottom of the screening box, and the sewage collecting box is arranged below the spray head. The sewage collecting box has a rectangular structure. The side walls of the screening box are bent inward to form a sewage outlet adapted to the sewage collecting box, and the screening space is connected to the sewage collecting box through the sewage outlet.

4. The concrete aggregate screening device according to claim 3, characterized in that: A guide plate is also provided in the screening space, and the guide plate is provided between the sewage collecting box and the screening plate, and a sewage discharge gap is provided between the guide plate and the screening plate. The guide plate is inclined, and the bottom end of the guide plate is provided close to the top end of the sewage collecting box, and the top end of the guide plate is provided close to the bottom end of the screening plate, and a second material passing gap is provided between the top end of the guide plate and the inner wall of the screening box.

5. The concrete aggregate screening device according to claim 4, characterized in that: The bottom end of the guide plate is arranged below the spray head.

6. The concrete aggregate screening device according to claim 4, characterized in that: The second material transfer gap is larger than the first material transfer gap.

7. The concrete aggregate screening device according to any one of claims 1 to 6, characterized in that: The blowing mechanism includes a base, a fan and a ventilation duct. The ventilation duct is installed on one side of the screening box corresponding to the position of the air inlet. The base and the screening box are spaced apart. The fan is installed on the base. The air outlet end of the fan is connected to the air inlet through the ventilation duct.

8. The concrete aggregate screening device according to any one of claims 1 to 6, characterized in that: The bottom of the screening box is provided with a discharge port which is communicated with the screening space.

9. The concrete aggregate screening device according to claim 8, characterized in that: A distribution plate is also provided in the screening space. The distribution plate is obliquely arranged below the screening plate. The bottom end of the distribution plate is arranged close to the discharge port. The top end of the distribution plate is arranged upward in a direction away from the discharge port. A plurality of distribution holes are opened on the distribution plate.

10. The concrete aggregate screening device according to claim 8, characterized in that: The concrete aggregate screening device further comprises a conveying line, and the conveying line is arranged below the discharge port.

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