Grading sand screening device

Abstract

The application discloses a hierarchical sand screening device, which comprises a rack, a sand screening box, a dust falling assembly, a roller screen and a plurality of jacking assemblies. The mixed materials are preliminarily screened through the rotation of the roller screen and the multiple-stage screen mesh arranged axially in sequence, and then are secondarily screened through the air separation flow channel at the bottom by virtue of the relatively loose materials in the falling process. The air force in the air separation flow channel gradually weakens from the coarse material screen end to the fine material screen end, thereby meeting the screening requirement. The fine materials are horizontally blown forward by the air force, and the jacking assembly is arranged at the bottom of each sand cavity. The jacking assembly blows air upward to provide upward thrust for the light materials, hinders the falling of the light materials, and cooperates with the secondary screening of the air separation flow channel, and the heavy materials fall down due to gravity. The dust falling assembly is arranged at the air inlet end of the air separation flow channel, the air force in the air separation flow channel has a certain degree of humidity, and the dust generated during the air separation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building material processing equipment, in particular to a grading sand screening device. BACKGROUND

[0002] Sand can be applied to construction, road repair, filtration, planting, chemical smelting and other fields, and has a wide range of applications. The sand and stone collected at the sand collecting site or the sand and stone yard will be screened by a sand screening device first, and the stone and large particle sand in the sand will be screened out and graded, so that sand of different particle sizes can be used for different purposes.

[0003] A multi-stage drum screening device is disclosed in Chinese utility model patent CN201020245730.5, which is provided with a receiving hopper at the lower end of the drum filter screen. The drum filter screen is a combined drum filter screen, and the front and rear filter screens are matched and fixed together in sequence. The combined drum filter screen and the central shaft thereof have an angle α with the horizontal plane. The mesh size of each filter screen gradually increases from front to back. When the material enters the drum device, the material on the screen surface is turned over and rolled due to the inclination and rotation of the drum device, so that sand particles of different particle sizes are screened out from different filter screens. However, due to the length limitation of each filter screen, part of the fine sand cannot be screened out in time and flows to the rear with other materials, so that a small amount of fine sand is mixed in the material screened out by the large-pore mesh. Further sorting is required in some places with high screening requirements. At this time, an auxiliary device needs to be added to further screen the material, so as to obtain higher screening quality. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a grading sand screening device with higher screening accuracy.

[0005] To solve the above technical problems, the technical solution adopted by the present application is:

[0006] The grading sand screening device comprises a rack, and is characterized in that it further comprises:

[0007] The sand screening box has a first end and a second end in the transverse direction. An air inlet is formed at the first end of the sand screening box, and the air inlet is connected with a connection blower system to form an air separation flow channel above the sand cavity. A plurality of vertical partition plates are fixed in the sand screening box in the transverse direction and at intervals, so as to divide the bottom of the inner cavity of the sand screening box into a plurality of chambers. The chamber close to the first end is a dust fall chamber, and the remaining chambers are sand storage chambers. The bottom of each sand storage chamber is provided with an openable sand discharge port.

[0008] The dust fall assembly is located in the dust fall chamber and is provided with a first spray head capable of spraying water upward. The first spray head and the dust fall chamber are connected through a circulation pipe. A submersible pump is arranged in the dust fall chamber and connected with the circulation pipe.

[0009] A rotary drum screen is inclined above a sand screening box, with its lower part located inside the screening box. The drum screen is rotatably fixed to a frame and driven to rotate by a rotating assembly. The drum screen has a feed inlet at one end near the second end of the screening box. The drum screen is inclined downwards from the feed inlet towards the other end, and has several screen holes arranged axially along its axis. Each sand storage chamber corresponds to a screen hole of a certain size, and the diameter of the screen holes increases from the feed inlet towards the other end.

[0010] Several lifting components are placed at the bottom of each sand chamber. The lifting components are connected to a blower system and have a second nozzle capable of blowing air upwards.

[0011] A further technical solution is that the lifting component includes:

[0012] The second nozzle has several spray holes;

[0013] The branch pipe is set vertically, with its upper end fixed to the second nozzle and its lower end extending out of the sand screening box and connected to the blower system.

[0014] The impeller, rotatably mounted inside the branch pipe via a horizontal first shaft, is spun by the gas flowing through the branch pipe. One end of the first shaft extends outside the branch pipe and is fixed with a first bevel gear.

[0015] The scraper can be attached to the top of the second nozzle. A vertical second rotating shaft is fixed on the outer edge of the scraper, and a second bevel gear that meshes with the first bevel gear is fixed on the second rotating shaft.

[0016] A further technical solution is that a proportional valve is provided on the branch pipe.

[0017] A further technical solution is that the inlet of the circulation pipe has a filter screen.

[0018] A further technical solution is that the top of the drum screen is covered with a dust cover, and the side of the dust cover facing the drum screen has a heating layer.

[0019] A further technical solution is that the height of the second nozzle is adjustable and can be locked.

[0020] A further technical solution is that the drum screen has a vibrating hammer.

[0021] A further technical solution is that the drum screen includes a drum frame, and has several openings arranged axially in sequence on the side of the drum frame, with a screen sheet covering the openings, and the screen sheet being detachably connected to the drum frame.

[0022] A further technical solution is that the rotating component includes:

[0023] Two driven gear rings are fixed to both ends of the drum screen, respectively; and

[0024] A dual-head motor is fixed on the frame, and each of the two output ends of the dual-head motor is fixed with a corresponding driven gear meshing with a main gear.

[0025] The beneficial effects of adopting the above technical solution are as follows:

[0026] The device uses a rotating drum screen and multiple screens arranged axially to initially screen the mixed materials. Then, the materials are further screened by air separation in the bottom air separation channel, where the materials are relatively loose during the falling process. The air force in the air separation channel gradually weakens from the coarse material screen end to the fine material screen end to meet the screening requirements. The air force blows the fine material horizontally forward, and a lifting component is installed at the bottom of each sand chamber. The lifting component blows air upward to provide upward thrust for the light material, hindering its fall. This works in conjunction with the secondary screening in the air separation channel, while the heavy material falls due to gravity.

[0027] A dust suppression component is installed at the air inlet of the air separation channel, which can spray water into the air separation channel to increase the humidity of the air in the air separation channel, reduce the large amount of dust generated during air separation, and avoid environmental pollution. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Fig. 1 This is a schematic diagram of the structure of the graded sand screening treatment device disclosed herein;

[0030] Fig. 2 This is a structural schematic diagram of the lifting component part disclosed herein;

[0031] Fig. 3 This is a schematic diagram of the dust cover portion of the rotary drum screen disclosed herein. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] like Figs. 1-3 As shown, the graded sand screening treatment device includes a frame, a sand screening box 1, a dust suppression component 2, a drum screen 3, and several lifting components 4.

[0035] The sand screening box 1 can be fixed to the frame or placed directly on a support surface such as the ground. The sand screening box 1 has a horizontal first end 101 and a second end 102. An air inlet 103 is provided at the first end 101 of the sand box. The air inlet 103 is connected to a blower system, so that an air classifier channel 01 is formed above the sand chamber. After the blower system is started, it can blow high-pressure air into the air classifier channel 01. Several vertical partitions 104 are fixed horizontally and at intervals inside the sand screening box 1 below the air classifier channel 01, dividing the bottom of the inner cavity of the sand screening box 1 into several chambers. Among them, the chamber near the first end 101 is the dust settling chamber 02, and the remaining chambers are sand storage chambers 03. Each sand storage chamber 03 has an openable sand discharge port at the bottom.

[0036] The dust suppression component 2 is located inside the dust suppression chamber 02, which stores a certain amount of water. The dust suppression component 2 has a first spray head capable of spraying water upwards. The first spray head is connected to the dust suppression chamber 02 via a circulation pipe. Inside the dust suppression chamber, there is a submersible pump connected to the circulation pipe. The pump body can be a submersible pump. Furthermore, there is a filter screen at the water inlet of the circulation pipe.

[0037] Water in the dust suppression chamber 02 is pumped into the dust suppression component 2 by the pump body, and water sprayed out by the first spray head will fall back into the dust suppression chamber 02, thus achieving recycling.

[0038] The drum screen 3 is tilted above the sand screening box 1, with its lower part inside the sand screening box 1, so that the screened material falls into the sand screening box 1. The drum screen 3 is rotatably fixed to the frame by bearings or other means, and is driven to rotate by a rotating assembly 5, which includes two driven gear rings and a double-headed motor. The two driven gear rings are fixed to both ends of the drum screen 3, and the double-headed motor is fixed to the frame. Each of the two output ends of the double-headed motor has a corresponding main gear meshing with the driven gear ring. After the double-headed motor is started, it drives the drum screen 3 to rotate around its axis.

[0039] The drum screen 3 has a feed inlet at one end near the second end 102 of the sand screening box 1. The drum screen 3 is inclined downward from the feed inlet to the other end. Several screen holes are arranged along its axial direction on the drum screen 3. Each sand storage chamber 03 corresponds to a screen hole of a certain size, and the diameter of the screen holes increases from the feed inlet to the other end. The drum screen 3 includes a drum frame, and several openings are arranged axially in sequence on the side of the drum frame. Screen mesh is covered on the openings, and the screen mesh is detachably connected to the drum frame by bolts or other means.

[0040] Several lifting components 4 are placed at the bottom of each sand chamber. The lifting components 4 are connected to a blower system and have a second nozzle 401 capable of blowing air upwards.

[0041] The device uses a rotating drum screen 3 and multiple screens arranged axially to initially screen the mixed materials. Then, the materials are screened again through the bottom air separation channel 01. The materials are relatively loose during the falling process and are screened a second time by air separation. The air force in the air separation channel 01 gradually weakens from the coarse material screen end to the fine material screen end to meet the screening requirements. The air force blows the fine material horizontally forward. At the bottom of each sand chamber, there is a lifting component 4. The lifting component 4 blows air upward to provide an upward thrust for the light material and prevents the light material from falling. This works in conjunction with the secondary screening in the air separation channel 01, while the heavy material falls due to gravity.

[0042] A dust-reducing component 2 is provided at the air inlet of the air separation channel 01, which can spray water into the air separation channel 01 to increase the humidity of the air in the air separation channel 01, reduce the large amount of dust generated during air separation, and avoid environmental pollution.

[0043] In the graded sand screening treatment device disclosed herein, the lifting assembly 4 includes a second nozzle 401, a branch pipe 402, an impeller 403, and a scraper 406. The second nozzle 401 has several spray holes. The branch pipe 402 is vertically arranged, with its upper end fixed to the spray head and its lower end extending out of the sand screening box 1 and connected to the blower system. The impeller 403 is rotatably placed inside the branch pipe 402 via a horizontal first rotating shaft 404, and can rotate due to the scouring of the gas inside the branch pipe 402. One end of the first rotating shaft 404 extends out of the branch pipe 402 and is fixed with a first bevel gear 405. The scraper 406 can be attached to the top of the second nozzle 401, and a vertical second rotating shaft 407 is vertically fixed on the outer edge of the scraper 406. A second bevel gear 408 that meshes with the first bevel gear 405 is fixed on the second rotating shaft 407.

[0044] High-pressure gas is blown into the branch pipe 402 by the blower system and sprayed upwards from the second nozzle 401. As the gas flows inside the pipe, it drives the impeller 403 to rotate, thus driving the first rotating shaft 404 to rotate. Since the first rotating shaft 404 and the second rotating shaft 407 are meshed by a bevel gear set, the second rotating shaft 407 is driven to rotate. This allows the scraper 406 to sweep the top of the second nozzle 401 as it rotates with the second rotating shaft 407, reducing the accumulation of sand particles, lowering the chance of the second nozzle 401 becoming clogged, and ensuring the smooth operation of the entire process.

[0045] In addition, each branch pipe 402 is equipped with a proportional valve 409, which can adjust the air volume of the lifting component 4 according to the size of the sand particles. The lifting component 4 near the air inlet 103 of the air classifier channel 01 has a larger air volume, which is suitable for blowing up large particles of material. The air volume of the lifting component 4 away from the air inlet 103 of the air classifier channel 01 gradually decreases.

[0046] The top of the drum screen 3 is covered with a dust cover 301, which can prevent environmental pollution caused by sand and dust overflow. On the side of the dust cover 301 facing the drum screen 3, there is a heating layer 302. The heating layer 302 can be an electric heating wire or a jacket filled with steam, hot oil or hot water, etc. The setting of the heating layer 302 can bake the drum screen 3, preventing the screen holes of the drum screen 3 from becoming damp and clogged with sand due to the setting of the dust suppression component 2.

[0047] In addition, the drum screen 3 has a vibrating hammer. The vibrating hammer can strike in various ways, such as by rotating an eccentric wheel structure or by shaking a motor to drive the pendulum to strike the drum screen 3 intermittently, so as to shake off the material adhering to the drum screen 3 and prevent the screen holes from clogging.

[0048] In the graded sand screening treatment device disclosed herein, the height of the second nozzle 401 and the height of the scraper 406 that cooperates with it are adjustable and can be locked by means of electric telescopic rods, etc., so as to prevent the second nozzle 401 from being buried too deep in the sand. The height of the second nozzle 401 increases with the increase of sand screening volume or sand screening time.

[0049] The above are merely preferred embodiments of the present invention. Any simple modifications, variations, and equivalent substitutions made by any person based on the content of the present invention shall fall within the protection scope of the present invention.

Claims

1. A graded sand screening device, comprising a frame, characterized in that, Also includes: The sand screening box (1) has a first end (101) and a second end (102) in the horizontal direction. An air inlet (103) is provided at the first end (101) of the sand screening box. The air inlet (103) is connected to a blower system, so that an air separation channel (01) is formed above the sand chamber. Several vertical partitions (104) are fixed horizontally and at intervals in the sand screening box (1) below the air separation channel (01), dividing the bottom of the inner cavity of the sand screening box (1) into several chambers. Among them, the chamber near the first end (101) is the dust settling chamber (02), and the remaining chambers are sand storage chambers (03). The bottom of each sand storage chamber (03) has a sand discharge port that can be opened. The dust suppression assembly (2) is located inside the dust suppression chamber (02) and has a first spray head capable of spraying water upward. The first spray head is connected to the dust suppression chamber (02) through a circulation pipe, and a submersible pump connected to the circulation pipe is located inside the dust suppression chamber. A rotary screen (3) is inclined above the sand screening box (1) and its lower part is located inside the sand screening box (1). The rotary screen (3) is rotatably fixed on the frame and driven to rotate by a rotating component (5). The end of the rotary screen (3) near the second end (102) of the sand screening box (1) has a feed inlet. The rotary screen (3) is inclined downward from the feed inlet to the other end. Several screen holes are arranged along its axial direction on the rotary screen (3). Each sand storage chamber (03) corresponds to a screen hole of a certain size, and the diameter of the screen holes increases from the feed inlet to the other end. The top of the rotary screen (3) is covered with a dust cover (301). The side of the dust cover (301) facing the rotary screen (3) has a heating layer (302). Several lifting components (4) are placed at the bottom of each sand chamber. The lifting components (4) are connected to a blower system and have a second nozzle (401) capable of blowing air upwards.

2. The graded sand screening device according to claim 1, characterized in that, The lifting assembly (4) includes: The second nozzle (401) has several nozzle holes; The branch pipe (402) is set vertically, with its upper end fixed to the second nozzle (401) and its lower end extending out of the sand screening box (1) and connected to the blower system; The impeller (403) is rotatably placed inside the branch pipe (402) via a horizontal first rotating shaft (404), and can rotate under the scouring of the gas in the branch pipe (402). One end of the first rotating shaft (404) extends out of the branch pipe (402) and is fixed with a first bevel gear (405); and The scraper (406) can be attached to the top of the second nozzle (401). A vertical second rotating shaft (407) is fixed on the outer edge of the scraper (406). A second bevel gear (408) that meshes with the first bevel gear (405) is fixed on the second rotating shaft (407).

3. The graded sand screening device according to claim 2, characterized in that, A proportional valve (409) is provided on the branch pipe (402).

4. The graded sand screening device according to claim 1, characterized in that, The inlet of the circulation pipe is equipped with a filter screen.

5. The graded sand screening device according to claim 1, characterized in that, The height of the second nozzle (401) is adjustable and can be locked.

6. The graded sand screening device according to claim 1, characterized in that, The drum screen (3) has a vibrating hammer.

7. The graded sand screening device according to claim 1, characterized in that, The drum screen (3) includes a drum frame, and has several openings arranged axially in sequence on the side of the drum frame. The openings are covered with screen sheets, and the screen sheets are detachably connected to the drum frame.

8. The graded sand screening device according to claim 1, characterized in that, The rotating component (5) includes: Two driven gear rings are fixed to both ends of the drum screen (3); and A dual-head motor is fixed on the frame, and each of the two output ends of the dual-head motor is fixed with a corresponding driven gear meshing with a main gear.

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