A sand and gravel aggregate screening device

Abstract

The utility model relates to building material processing equipment technical field, more particularly to a sand and gravel aggregate powder selecting device, including shell body, carousel mechanism and air inlet mechanism, the shell body is formed from top to bottom suspension cavity, vortex cavity, cyclone cavity and air inlet cavity in, the periphery wall of grading cage is rotatably connected with shell body and can form primary cyclone. Air inlet mechanism is equipped with the air inlet pipe of air communication with fan, and the air inlet cavity is communicated and forms secondary cyclone in cyclone cavity, and its rotation direction is opposite with primary cyclone. The reverse double cyclone collides and shears in cyclone cavity, enhances the turbulence and the uniformity of gas distribution, solves the problem of uneven air volume outside vortex area. The design of grading cage tight cover material distribution disc makes material off disc into grading area, shortens the separation path and strengthens initial classification. Four-stage cavity vertical layout cooperation stable ascending airflow generated by reverse cyclone and dust removal pipe communication suspension cavity design, realize fine powder efficient separation and rapid discharge, stable control mechanism sandstone powder content to satisfy high standard requirement.

Description

Technical Field

[0001] This utility model relates to the field of building material processing equipment technology, and more specifically, to a sand and gravel aggregate powder sorting device. Background Technology

[0002] Sand and gravel aggregates are indispensable basic raw materials for construction engineering, mainly referring to sand, crushed stone, or pebbles used in concrete, mortar, and various foundation projects. They form the skeleton of building materials, providing strength and stability, and are the fundamental guarantee for the safety, durability, and economy of engineering structures. Their quality, such as gradation, mud content, and strength, has a decisive impact on the performance of the final engineering products. With the increasing scarcity of natural sand resources and stricter environmental protection requirements, manufactured sand is playing an increasingly important role.

[0003] In the process of producing manufactured sand using crushing equipment such as impact crushers, sand making machines, cone crushers, or jaw crushers, a large amount of fine powder is inevitably generated, with a particle size typically less than 0.075mm. This fine powder is called stone powder. Appropriate amounts of stone powder in concrete can play a positive role in filling voids, improving workability, and reducing water demand. However, excessive stone powder content can lead to decreased concrete performance and resource waste. To address the problem of excessive stone powder content, modern manufactured sand production lines generally include air classifiers to control the stone powder content. Existing air classifiers typically control the stone powder content by controlling the power of the blower and the vortex formed by the rotating cage. However, uneven airflow occurs outside the vortex area. When producing high-quality sand and gravel aggregates, the required stone powder content is higher, and existing air classifiers can no longer meet this demand. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a sand and gravel aggregate classifier, designed to improve the screening accuracy of stone powder content in the classifier.

[0005] A sand and gravel aggregate powder selection device according to an embodiment of the present invention includes:

[0006] The outer shell contains, from top to bottom, a suspension cavity, a vortex cavity, a swirl cavity, and an air inlet cavity; a feed hopper is provided at the upper end of the outer shell, and a discharge hopper is provided at the lower end of the outer shell; the output port of the feed hopper is located in the vortex cavity; a dust removal pipe is provided on the peripheral side wall of the outer shell, and the dust removal pipe is connected to the suspension cavity;

[0007] A turntable mechanism is provided with a feeding disc at the upper part of the swirling cavity. A grading cage is fitted on the outer edge of the feeding disc. The outer peripheral wall of the grading cage is rotatably connected to the outer shell. The grading cage can form a swirling flow when it rotates.

[0008] An air intake mechanism is provided, which is equipped with an air intake pipe connected to the fan. The axis of the air intake pipe is tangent to the concentric circle of the outer shell. The air intake pipe is connected to the air intake cavity. The air intake pipe can form a secondary vortex in the vortex cavity. The direction of the secondary vortex is opposite to that of the primary vortex.

[0009] According to some embodiments of the present invention, the air inlet pipe includes a first air inlet and a second air inlet, the first air inlet and the second air inlet are respectively located on both sides of the outer casing, and the opening directions of the first air inlet and the second air inlet are opposite.

[0010] According to some embodiments of the present invention, an impeller is rotatably disposed inside the air inlet cavity. When the impeller rotates, it can adjust the opening size of the first air inlet or the second air inlet. The impeller is provided with blades, which are inclined along the direction of the secondary vortex.

[0011] According to some embodiments of the present invention, an inverted conical baffle is provided inside the swirling cavity.

[0012] According to some embodiments of this utility model, an arc-shaped baffle is provided on the upper end surface of the spreading disc; the rotation direction of the arc-shaped baffle is the same as that of the spreading disc.

[0013] According to some embodiments of the present invention, the turntable mechanism includes a drive motor, a coupling, and a drive shaft. The drive motor is fixedly connected to the outer casing. The output end of the drive motor is connected to the drive shaft through the coupling. The lower end of the drive shaft is connected to the spreading disc. The coupling is a flexible coupling.

[0014] According to some embodiments of the present invention, a dust collection mechanism is also included, wherein N cyclone dust collectors are arranged circumferentially on the outer shell, and the feed end of the cyclone dust collector is connected to the dust collection pipe along the tangential direction; wherein, N≥1.

[0015] According to some embodiments of the present invention, the dust collection mechanism includes an exhaust pipe, which is connected to the exhaust end of the cyclone dust collector.

[0016] According to some embodiments of the present invention, the dust collection mechanism includes a dust hopper, which is sleeved on the discharge hopper of the outer shell, and the upper end of the dust hopper is connected to the discharge end of the cyclone dust collector.

[0017] According to some embodiments of the present invention, an observation window is provided on the peripheral wall of the outer shell.

[0018] A sand and gravel aggregate powder selection device according to an embodiment of the present utility model has at least the following beneficial effects:

[0019] According to the present invention, the sand and gravel aggregate classifying device includes an outer shell, a turntable mechanism, and an air inlet mechanism. The outer shell contains, from top to bottom, a suspension cavity, a vortex cavity, a swirling cavity, and an air inlet cavity. A feed hopper is located at the upper end of the outer shell, and a discharge hopper is located at the lower end. The output port of the feed hopper is located in the vortex cavity. A dust removal pipe is installed on the peripheral wall of the outer shell, and the dust removal pipe is connected to the suspension cavity. A spreading disc is installed on the upper part of the swirling cavity on the turntable mechanism. A classifying cage is fitted onto the outer edge of the spreading disc, and the outer peripheral wall of the classifying cage is rotatably connected to the outer shell. The classifying cage can form a primary swirling flow when rotating. The air inlet mechanism is equipped with an air inlet pipe connected to a fan, and the axis of the air inlet pipe is tangent to the concentric circle of the outer shell. The air inlet pipe is connected to the air inlet cavity. The air inlet pipe can form a secondary swirling flow in the swirling cavity, and the direction of the secondary swirling flow is opposite to that of the primary swirling flow.

[0020] In this scheme, a primary vortex formed by the rotation of the classifying cage and a secondary vortex formed by the tangential air intake of the air inlet pipe are set up, ensuring that the direction of the secondary vortex is opposite to that of the primary vortex. The strong collision and shearing effect of the two counter-current vortices in the vortex cavity significantly enhances the turbulence of the flow field and the uniformity of gas distribution within the entire cavity, effectively solving the technical defect of uneven air volume distribution outside the vortex zone in traditional air classifiers. The structural design of the classifying cage being directly fitted onto the outer edge of the spreading disc ensures that the material immediately enters the classification area of ​​the primary vortex after leaving the spreading disc, shortening the sorting path and enhancing the initial classification effect. The vertical layout of the four-stage cavity and the connection design between the dust removal pipe and the suspension cavity, combined with the stable upward airflow generated by the counter-current double vortex, achieve efficient separation and rapid discharge of fine powder. The synergistic effect of the overall structure can more stably control the stone powder content in the finished manufactured sand under high precision requirements, meeting the strict standards for stone powder content in the production of high-quality sand and gravel aggregates. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a top view schematic diagram of the structure of this utility model;

[0023] Figure 3 For the present utility model Figure 2 A schematic diagram of the cross-sectional structure of AA;

[0024] Figure 4 This is a partial cross-sectional structural diagram of the present invention;

[0025] Figure 5 This is a schematic diagram of one structure of the impeller of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the material spreading disc of this utility model.

[0027] In the picture:

[0028] 100-Outer shell, 101-Suspension cavity, 102-Vortex cavity, 103-Swirl cavity, 104-Air inlet cavity, 110-Feed hopper, 120-Discharge hopper, 130-Dust removal pipe;

[0029] 200-Turntable mechanism, 210-Dispensing disc, 211-Arc-shaped baffle, 220-Grading cage, 230-Drive motor, 240-Flexible coupling, 250-Drive shaft;

[0030] 300 - Air inlet mechanism, 310 - Air inlet pipe, 311 - First air inlet, 312 - Second air inlet, 320 - Impeller, 321 - Blade, 330 - Inverted conical baffle;

[0031] 400-Dust collection mechanism, 410-Cyclone dust collector, 411-Feed end, 412-Exhaust end, 413-Discharge end, 420-Exhaust pipe, 430-Dust hopper. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] reference Figures 1 to 6As shown, this utility model discloses a sand and gravel aggregate classification device, which includes an outer shell 100, a turntable mechanism 200, and an air inlet mechanism 300. The outer shell 100 contains, from top to bottom, a suspension cavity 101, a vortex cavity 102, a swirl cavity 103, and an air inlet cavity 104. A feed hopper 110 is located at the upper end of the outer shell 100, and a discharge hopper 120 is located at the lower end. The output port of the feed hopper 110 is located in the vortex cavity 102. A dust removal pipe 130 is provided on the peripheral wall of the outer shell 100, and the dust removal pipe 130 is connected to the suspension cavity 101. The turntable mechanism 200... A material spreading disc 210 is provided on the upper part of the vortex cavity 103. A grading cage 220 is sleeved on the outer edge of the material spreading disc 210. The outer peripheral wall of the grading cage 220 is rotatably connected to the outer shell 100. In this embodiment, the grading cage 220 can disperse the material. At the same time, the grading cage 220 can form a primary vortex when rotating. The air inlet mechanism 300 is provided with an air inlet pipe 310 connected to the fan. The axis of the air inlet pipe 310 is tangent to the concentric circle of the outer shell 100. The air inlet pipe 310 is connected to the air inlet cavity 104. The air inlet pipe 310 can form a secondary vortex in the vortex cavity 103. The direction of the secondary vortex is opposite to that of the primary vortex. Specifically, in this embodiment, the material enters the vortex cavity 102 through the feed hopper 110 at the upper end of the outer shell 100. The material then falls onto the spreading disc 210 of the turntable mechanism 200 located at the upper part of the vortex cavity 103. The spreading disc 210 rotates and evenly spreads the material outward. At this time, the classifying cage 220 forms a vortex at the outer edge of the spreading disc 210 during rotation. This vortex classifies the material, and some fine powder enters the suspension cavity 101 upward under the airflow. At the same time, the air inlet mechanism 300 sends the airflow generated by the fan into the air inlet cavity 104 tangentially through the air inlet pipe 310. The airflow rises and enters the vortex cavity 103. 03 A secondary vortex is formed, and the rotation direction of the secondary vortex is opposite to that of the primary vortex generated by the classifying cage 220. The counter-rotating secondary vortex interacts with the primary vortex, enhancing the turbulence intensity in the vortex cavity 103 and improving the overall flow field uniformity, so that the material particles are more fully sorted under strong turbulence. The fine powder lifted by the airflow continues to move upward into the suspension cavity 101, and is finally collected and removed through the dust removal pipe 130 on the side wall of the outer shell 100. The coarse particles that meet the particle size requirements continue to sink under the action of gravity, overcoming the rising airflow, and are finally discharged through the discharge hopper 120 at the lower end of the outer shell 100.Through the design of this structure, by setting up a primary vortex formed by the rotation of the grading cage 220 and a secondary vortex formed by the tangential air intake of the air inlet pipe 310, and ensuring that the direction of the secondary vortex is opposite to that of the primary vortex, the strong collision and shearing effect of the two counter-current vortices in the vortex cavity 103 significantly enhances the turbulence of the flow field and the uniformity of gas distribution within the entire cavity, effectively solving the technical defect of uneven air volume distribution outside the vortex zone in traditional air classifiers. The structural design of the grading cage 220 being directly fitted onto the outer edge of the spreading plate 210 allows the material to immediately enter the grading area of ​​the primary vortex after leaving the spreading plate 210, shortening the sorting path and enhancing the initial grading effect. The vertical layout of the four-stage cavity and the connection design between the dust removal pipe 130 and the suspension cavity 101, combined with the stable upward airflow generated by the counter-current double vortex, achieve efficient separation and rapid discharge of fine powder. The synergistic effect of the overall structure can more stably control the stone powder content in the finished manufactured sand under high precision requirements, meeting the strict standards for stone powder content in the production of high-quality sand and gravel aggregates.

[0037] In some embodiments of this utility model, the air inlet pipe 310 includes a first air inlet 311 and a second air inlet 312. The first air inlet 311 and the second air inlet 312 are respectively located on both sides of the outer shell 100, and the opening directions of the first air inlet 311 and the second air inlet 312 are opposite. Specifically, in this embodiment, after the material enters the vortex cavity 102 through the feed hopper 110, it falls onto the spreading disc 210. The rotation of the spreading disc 210 evenly spreads the material to the periphery. At this time, the rotating grading cage 220 forms a vortex at the outer edge of the spreading disc 210, which performs preliminary grading of the material. At the same time, the airflow from the fan is conveyed through the air inlet mechanism 300, wherein the first air inlet 311 and the second air inlet 312 of the air inlet pipe 310 are respectively arranged on both sides of the outer shell 100 and the opening directions are opposite. The particles enter the air inlet chamber 104 simultaneously from opposite directions in a tangential manner, and superimpose to form a secondary vortex with higher intensity and more uniform distribution in the vortex chamber 103. This secondary vortex strictly maintains the opposite rotation direction to the primary vortex of the classifying cage 220. The counter-current double vortex forms a strong turbulent shear field in the vortex chamber 103, and the material particles are repeatedly sorted in a highly turbulent state. Fine powder is discharged from the dust removal pipe 130 through the suspension chamber 101 with the rising airflow, while qualified coarse particles overcome the airflow resistance and settle into the discharge hopper 120.

[0038] Through the design of this structure, the first air inlet 311 and the second air inlet 312 adopt a symmetrical and opposite design, so that the tangential airflow is simultaneously input from both sides of the shell and the torque direction is complementary, which significantly enhances the rotational kinetic energy and flow field stability of the secondary vortex. The bidirectional air inlet structure completely eliminates the vortex eccentricity phenomenon caused by unilateral air inlet, ensuring that the wind speed distribution of the radial section of the vortex cavity 103 is highly uniform, fundamentally solving the defect of uneven air volume in the non-vortex zone of traditional air classifiers. The superimposed vortex generated by the reverse dual air inlets greatly enhances the turbulence intensity, so that the material particles undergo more thorough classification in the strong shear field, especially enhancing the separation accuracy of fine powders. The symmetrical air inlet design reduces the airflow sensitivity of the equipment to the installation orientation, ensuring the stability and reliability of stone powder content control under different working conditions. This innovative structure significantly improves the sorting efficiency by optimizing the airflow organization without increasing the fan power, meeting the stringent control requirements of high-quality sand and gravel aggregates for stone powder content.

[0039] In some embodiments of this utility model, an impeller 320 is rotatably disposed inside the air inlet cavity 104. When rotating, the impeller 320 can adjust the opening size of the first air inlet 311 or the second air inlet 312. The impeller 320 is equipped with blades 321, which are inclined along the direction of the secondary vortex. Specifically, in this embodiment, material falls into the vortex cavity 102 through the feed hopper 110 and then falls onto the spreading disc 210. The spreading disc 210 rotates to evenly spread the material. The grading cage 220 rotates and forms a primary vortex on the outer edge of the spreading disc 210 to achieve initial material grading. The fan airflow enters the air inlet cavity 104 simultaneously through the first air inlet 311 and the second air inlet 312 in opposite tangential directions. At this time, the rotating impeller 320 inside the air inlet cavity 104 actively adjusts the opening size of the first air inlet 311 or the second air inlet 312 through its blades 321, which are inclined along the direction of the secondary vortex. The size of the second air inlet 312 is adjusted to precisely control the air intake ratio on both sides. The two airflows, after being adjusted by the impeller 320, converge and strengthen in the swirl chamber 103 to form a uniform and stable counter-current secondary swirl. This secondary swirl continuously converges with the primary swirl generated by the classifier cage 220, forming a high-intensity full-section turbulent field inside the swirl chamber 103. The material particles undergo multi-stage sorting in the strong turbulent environment. Fine powder enters the suspension chamber 101 with the rising airflow and is discharged through the dust removal pipe 130, while qualified coarse particles settle into the discharge hopper 120. The rotatable and adjustable design of the impeller 320 enables dynamic control of the opening size of the first air inlet 311 and the second air inlet 312, allowing for real-time optimization of the air intake balance on both sides according to the material characteristics; the tilted structure of the blades 321 along the secondary swirl direction significantly reduces the energy loss when the airflow passes through the impeller 320, ensuring that the fan power is efficiently converted into swirl kinetic energy; the precise allocation of airflow through the dual air inlets by the impeller 320 completely eliminates local airflow deviation, ensuring uniform wind speed distribution within the swirl cavity 103.

[0040] In some embodiments of this utility model, an inverted conical baffle 330 is provided inside the cyclone cavity 103. Specifically, in this embodiment, the conical structure of the inverted conical baffle 330 effectively intercepts coarse particles that float due to airflow disturbance, completely eliminating the risk of qualified coarse particles escaping to the fine powder zone; its physical barrier effect forces coarse particles to slide along the conical surface to the central unloading channel, significantly improving the settling efficiency of coarse particles and shortening the sorting cycle; the baffle's rectification function for the rising airflow optimizes the flow field distribution in the upper part of the cyclone cavity 103, making the countercurrent double cyclone form a more uniform and stable strong turbulent sorting zone above the baffle; the design of the central opening of the baffle precisely separates the feeding path and the rising airflow path, ensuring that the fine powder is fully suspended while avoiding the retention of coarse particles; the synergistic effect of this structure and the impeller 320 airflow regulation system enhances the fine powder separation accuracy and ensures the purity of coarse particle recovery; ultimately achieving a dual improvement in sorting efficiency and finished product quality.

[0041] In some embodiments of this utility model, an arc-shaped baffle 211 is provided on the upper surface of the feeding disc 210; the rotation direction of the arc-shaped baffle 211 is the same as that of the feeding disc 210. Specifically, in this embodiment, the arc-shaped baffle 211, which is arranged in the same direction on the upper surface of the feeding disc 210, extends the material residence time by physically blocking it, completely eliminating the phenomenon of material accumulation or local aggregation on the disc surface; the layout of the baffle and the feeding disc 210 with the same rotation direction makes the material move in an orderly manner along a preset arc trajectory, significantly improving the radial uniformity and initial velocity consistency of the material being thrown; the material flow regulated by the baffle enters the primary vortex action zone of the grading cage 220 in a stable state, ensuring the stability and comprehensive coverage of the primary sorting; this structure optimizes the material dispersion from the source, laying a uniform material distribution foundation for the subsequent high-precision sorting of the reverse double vortex flow; the synchronous rotation design of the arc-shaped baffle 211 avoids additional power consumption, and its simple and reliable physical structure greatly reduces the fluctuation of fine powder recovery rate caused by uneven feeding; ultimately achieving a full-process stability improvement from feeding to grading.

[0042] In some embodiments of this utility model, the turntable mechanism 200 includes a drive motor 230, a coupling, and a drive shaft 250. The drive motor 230 is fixedly connected to the housing 100. The output end of the drive motor 230 is connected to the drive shaft 250 via the coupling. The lower end of the drive shaft 250 is connected to the spreading disc 210. The coupling is a flexible coupling 240. Specifically, in this embodiment, by setting the flexible coupling 240, the deviation between the drive shaft 250 and the output end of the motor can be adapted and compensated, and vibration damping and impact buffering can be provided.

[0043] In some embodiments of this utility model, a dust collection mechanism 400 is also included. The dust collection mechanism 400 has N cyclone dust collectors 410 arranged circumferentially around the outer shell 100. The feed end 411 of the cyclone dust collector 410 is connected to the dust collection pipe 130 tangentially; wherein, N≥1. Specifically, in this embodiment, four cyclone dust collectors 410 are provided. After the material enters the vortex cavity 102 through the feed hopper 110, it falls to the spreading disc 210. When the spreading disc 210 rotates, the unidirectional arc-shaped baffles 211 on its upper surface prolong the material retention time and guide even spreading. The material enters the grading cage 220, forming a primary vortex to complete the initial grading. The fan airflow passes through the bidirectional air inlet and is adjusted by the impeller 320 to form a counter-current secondary vortex. The two vortices interact strongly in the vortex cavity 103, and the inverted cone-shaped baffle 330 intercepts coarse particles and enhances sorting. The fine powder carried by the rising airflow enters the suspension cavity 10. After 1, the four cyclone dust collectors 410 of the dust collection mechanism 400 are connected to the feed end 411 of the suspension cavity 101 in a tangential direction, and the dust-laden airflow is introduced tangentially into each cyclone dust collector 410; the fine powder is separated and falls by centrifugal force on the inner wall of the cyclone dust collector 410, and the purified airflow is discharged from the top; the separated stone powder is finally collected at the bottom collection port of the cyclone dust collector 410, while the trace residual fine powder in the suspension cavity 101 that is not captured is reprocessed with the airflow; qualified coarse particles continue to settle into the discharge hopper 120. The tangential air inlet structure of the cyclone dust collector 410 fully utilizes the tangential kinetic energy of the airflow, enabling the dust-laden airflow to form a high-speed swirling field inside the dust collector, significantly improving the centrifugal separation efficiency of stone powder; the multi-unit parallel dust collection system reduces the load on individual dust collectors through diversion treatment, avoiding the escape of fine powder caused by airflow overload; the physical capture effect of the cyclone dust collector 410 on stone powder directly reduces the dust concentration in the suspension cavity 101, providing a more stable sorting environment for the counter-current double swirling flow.

[0044] In some embodiments of this utility model, the dust collection mechanism 400 includes an exhaust pipe 420, which is connected to the exhaust end 412 of the cyclone dust collector 410. Specifically, in this embodiment, one end of the exhaust pipe 420 can be connected to the input end of the fan to form a circulating airflow path. Through the design of this mechanism, a small amount of stone dust can be avoided from polluting the environment.

[0045] In some embodiments of this utility model, the dust collection mechanism 400 includes a dust hopper 430, which is sleeved on the discharge hopper 120 of the outer shell 100. The upper end of the dust hopper 430 is connected to the discharge end 413 of the cyclone dust collector 410. Specifically, in this embodiment, the double-hopper sleeve structure, through this mechanism design, can improve the structural strength of the lower end of the outer shell 100, thereby providing stability to the device.

[0046] In some embodiments of this utility model, an observation window is provided on the peripheral wall of the outer casing 100. Specifically, in this embodiment, by providing an observation window, the working conditions inside the outer casing 100 can be monitored. In this embodiment, the observation window can be made of high-strength glass, such as bulletproof glass or explosion-proof glass.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A sand aggregate sorting device, characterized by, include: The outer shell (100) contains, from top to bottom, a suspension cavity (101), a vortex cavity (102), a swirl cavity (103), and an air inlet cavity (104); a feed hopper (110) is provided at the upper end of the outer shell (100), and a discharge hopper (120) is provided at the lower end of the outer shell (100); the output port of the feed hopper (110) is located in the vortex cavity (102); a dust removal pipe (130) is provided on the peripheral sidewall of the outer shell (100), and the dust removal pipe (130) is connected to the suspension cavity (101); A turntable mechanism (200) is provided with a feeding disc (210) on the upper part of the swirling cavity (103). A grading cage (220) is sleeved on the outer edge of the feeding disc (210). The outer peripheral wall of the grading cage (220) is rotatably connected to the outer shell (100). The grading cage (220) can form a swirling flow when it rotates. An air intake mechanism (300) is provided with an air intake pipe (310) connected to a fan. The axis of the air intake pipe (310) is tangent to the concentric circle of the outer shell (100). The air intake pipe (310) is connected to the air intake cavity (104). The air intake pipe (310) can form a secondary vortex in the vortex cavity (103). The direction of the secondary vortex is opposite to that of the primary vortex.

2. The sand and gravel aggregate screening device of claim 1, wherein, The air inlet pipe (310) includes a first air inlet (311) and a second air inlet (312). The first air inlet (311) and the second air inlet (312) are located on both sides of the outer casing (100), and the opening directions of the first air inlet (311) and the second air inlet (312) are opposite.

3. The sand and gravel aggregate screening apparatus of claim 2, wherein, An impeller (320) is rotatably disposed inside the air inlet cavity (104). When the impeller (320) rotates, it can adjust the opening size of the first air inlet (311) or the second air inlet (312). The impeller (320) is provided with blades (321), and the blades (321) are inclined along the direction of the secondary vortex.

4. The sand and gravel aggregate screening apparatus of claim 3, wherein, An inverted conical baffle (330) is provided inside the swirling cavity (103).

5. The sand and gravel fractionating device of claim 4, wherein, The upper end face of the spreading disc (210) is provided with an arc-shaped baffle (211); the direction of rotation of the arc-shaped baffle (211) is the same as that of the spreading disc (210).

6. The sand and gravel sorting apparatus of claim 1, wherein, The turntable mechanism (200) includes a drive motor (230), a coupling and a drive shaft (250). The drive motor (230) and the outer casing (100) are fixedly connected. The output end of the drive motor (230) is connected to the drive shaft (250) through the coupling. The lower end of the drive shaft (250) is connected to the spreading disc (210). The coupling is a flexible coupling (240).

7. The sand and gravel sorting apparatus of claim 1, wherein, It also includes a dust collection mechanism (400), which has N cyclone dust collectors (410) arranged around the outer shell (100), and the feed end (411) of the cyclone dust collector (410) is connected to the dust collection pipe (130) in the tangential direction; wherein, N≥1.

8. The sand and gravel fractionating device of claim 7, wherein, The dust collection mechanism (400) includes an exhaust pipe (420), which is connected to the exhaust end (412) of the cyclone dust collector (410).

9. The sand and gravel fractionating device of claim 8, wherein, The dust collection mechanism (400) includes a dust hopper (430), which is fitted onto the discharge hopper (120) of the outer shell (100). The upper end of the dust hopper (430) is connected to the discharge end (413) of the cyclone dust collector (410).

10. The sand and gravel sorting device according to claim 1, characterized in that An observation window is provided on the peripheral wall of the outer shell (100).

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