CN114192287B

CN114192287B - Rotary sand and stone screening device and screening method

Info

Publication number: CN114192287B
Application number: CN202111385734.2A
Authority: CN
Inventors: 胡艳香; 丁辰; 薛凯喜; 周朝慧; 曹凯; 刘帅; 李栋伟; 陈昊; 储怡鑫; 王瑞洋; 刘欣; 朱小伟; 汪昌颖
Original assignee: East China Institute of Technology
Current assignee: East China Institute of Technology
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2023-08-18
Anticipated expiration: 2041-11-22
Also published as: CN114192287A

Abstract

The invention relates to the technical field of civil construction equipment, in particular to a rotary sand screening device and a screening method. The apparatus includes a housing, a screen assembly, and a spray structure. The motor is utilized to drive the sieve bucket to rotate through the transmission structure, so that the structure of the sieve bucket is optimized, and the working noise is reduced. The spraying structure avoids dust flying and diffusing in the sand and stone separation process. Simultaneously, the bottom of sieve fill is provided with ejection of compact structure, and ejection of compact structure has open state and closed state, when being in open state, and the discharge channel in the ejection of compact structure connects sieve fill and first discharge gate. When the sieve hopper is in a closed state, a baffle plate in the discharging structure seals the discharging channel to separate the sieve hopper from the first discharging hole. The reciprocating circulation is realized, the periodic automatic discharge of coarse sand is realized, the manual intervention is reduced, and the screening efficiency of sand is further improved.

Description

Rotary sand and stone screening device and screening method

Technical Field

The invention relates to the technical field of civil construction equipment, in particular to a rotary sand screening device and a screening method.

Background

In the civil engineering construction process, a great amount of sand and stones with different particle sizes are needed for manufacturing common building materials such as concrete, mortar and the like. Sand refers to a loose mixture of sand and crushed stone. Geologically, mineral or rock particles having a particle size of 0.074mm to 2mm are commonly referred to as sand, and mineral or rock particles having a particle size greater than 2mm are referred to as gravel or breccia. In order to ensure each performance of the construction material, when the concrete is manufactured and processed, the proportion of the grain size of the sand stone is required to be controlled, and the sand stone is screened by utilizing a separating device, so that the concrete meets the production standard. In addition, when the experiment of Guan Yan soil mass is carried out in universities and academy of sciences, a large amount of sand and stone soil with different particle sizes is needed, so that the screening device has wide application in the technical field of civil engineering.

For example, chinese patent document CN211330157U discloses a sand screening device for civil engineering and construction. The sand screening device comprises a fixed base plate. The bottom of the fixed base plate is fixedly provided with supporting legs. The top of the fixed substrate is fixedly provided with a supporting frame. The inside of the support frame is fixedly provided with a receiving plate which forms an angle of thirty degrees relative to the fixed base plate. The movable rod is fixedly arranged in the support frame. Two pentagonal connecting rods are fixedly arranged outside the movable rod through bearings. Through set up the helical blade that can with accept board mutual contact in this sand screening device's inside, do benefit to the sand or the material extrusion that link together in the sand, avoided being difficult to the screening together at the in-process sand adhesion of screening, then cause the waste of sand.

For another example, chinese patent document CN211385155U discloses an automatic sand screening machine. The sand screening machine comprises a first sand screening part, a second sand screening part, a sand pumping part and a sand crushing device. When the sand screening machine is used, sand is pumped to the first sand screening part through the sand pumping part, sand which is screened by the sand screening part of the first sand screening part directly enters the second sand screening part to screen sand, and large-particle sand and sand blocks are conveyed to the sand crushing device by the first sand screening part to be crushed, then enter the second sand screening part to screen sand by the sand crushing device, and finally needed sand enters the sand discharging port through the filter screen of the second sand screening part, and unnecessary sand enters the waste port from the bottom of the second sand screening part. The sand screening machine has the functions of sand pumping, sand screening, sand crushing, and the like, is simple in structure and high in cost performance, and does not need secondary sand screening, so that the working efficiency of sand screening is improved.

However, the sand screening device and the sand screening machine can cause dust to fly and spread in the use process, so that the surrounding environment is polluted, and the health of operators is affected. The sand and stone separating equipment in the prior art mostly adopts swinging or shaking type, and the noise is large in the use process. Especially, the shaking type separating equipment has large working noise, sand and stone are easy to shake out, and further cleaning sites are needed after the separating process is finished, so that the workload is increased. In addition, current splitter is difficult to realize periodic discharge to coarse grain grit, needs manual intervention to clear up the coarse grain grit that does not sieve, and then has influenced the separation efficiency of grit.

To sum up, in the course of civil engineering construction, how to design a grit splitter for reduce the operational noise, avoid the dust in the grit separation process to fly upward and the diffusion, optimize simultaneously and sieve the fight structure, realize the periodic discharge to coarse grain grit, further promote the screening efficiency of grit, become the technical problem that technical personnel in the field need to solve urgently.

Disclosure of Invention

The invention aims to provide sand and stone separation equipment for reducing working noise in the civil engineering construction process, avoiding dust flying and diffusing in the sand and stone separation process, optimizing a sieve bucket structure, realizing periodic discharge of coarse sand and stone, and further improving the sieving efficiency of sand and stone.

In order to achieve the above purpose, the present invention adopts the following scheme: the rotary sand screening device comprises a shell, a screening component and a spraying structure for spraying water into the shell;

the top of the shell is provided with a feed inlet for sand and stone to enter, an inner cavity for placing the screening component is formed in the shell, and a first discharge port and a second discharge port are formed in the bottom of the inner cavity;

the screening assembly comprises a screening hopper, a motor and a transmission structure, wherein screening holes are formed in the side wall of the screening hopper, an inlet of the screening hopper is connected with a feeding hole, an outlet of the screening hopper is provided with a discharging structure, the discharging structure is connected with a first discharging hole through a baffle, the motor is fixedly arranged on a shell, and an output shaft of the motor is connected with the screening hopper through the transmission structure;

the discharging structure is provided with an opening state and a closing state, and when the discharging structure is in the opening state, a discharging channel in the discharging structure is connected with the sieve bucket and the first discharging hole;

when the sieve hopper is in a closed state, the baffle plate in the discharging structure seals the discharging channel to separate the sieve hopper from the first discharging hole.

Preferably, the discharging structure comprises a supporting block and a baffle plate, the supporting block is connected with an outlet of the sieve bucket, a discharging channel for connecting the sieve bucket and the first discharging port is arranged in the supporting block, a sliding groove is formed in the inner wall of the supporting block, a first magnetic block is arranged at the bottom of the sliding groove, the baffle plate is positioned at the outlet of the discharging channel, a pull rod is arranged on the baffle plate, a second magnetic block is arranged at the tail end of the pull rod, the second magnetic block is connected with the first magnetic block through magnetic force, a second spring is arranged in the sliding groove, one end of the second spring is connected with the second magnetic block, and the other end of the second spring is connected with the supporting block.

Preferably, the transmission structure comprises a rotating shaft, a first bevel gear and a second bevel gear, wherein the rotating shaft is connected with an output shaft of the motor, the first bevel gear is connected with the rotating shaft through a cylindrical block, the second bevel gear is connected with the sieve bucket through a connecting block, and the first bevel gear is meshed with the second bevel gear.

Preferably, the spraying structure comprises a water storage tank and a water suction pipe, the water storage tank is located on the outer side of the shell, the water suction end of the water suction pipe is connected with the water storage tank, the water spray end of the water suction pipe is connected with the inner cavity, an opening is formed in the water suction pipe, a piston is arranged in the opening and connected with the water suction pipe through a first spring, a cam is arranged on a rotating shaft and rotates along with rotation of the rotating shaft, and the piston is located right above the cam.

Preferably, the baffle is provided with a buffer block, and the buffer block is positioned right below the baffle plate. So set up, the buffer board is used for forming the buffering to baffle decurrent motion, is favorable to reducing baffle to baffle's impact, and the coarse sand of being convenient for is discharged from first discharge gate through discharge channel, has further improved screening plant operation's stability.

Preferably, the sieve holes are distributed on the side wall of the sieve bucket at equal intervals, the bottom of the sieve bucket is cone-shaped, and the middle section of the sieve bucket is cylindrical. So set up, be convenient for the particle diameter be less than the sand of sieve mesh diameter and sieve to the inner chamber in evenly, be favorable to quick with sand and coarse sand separation, the middle section of sieve fill is the cylinder and is favorable to coarse sand to hug closely on the inner wall of sieve fill under the effect of centrifugal force, the bottom of sieve fill is the awl cylindric and is favorable to coarse sand to collect in the discharge channel, the baffle is opened smoothly to the coarse sand of being convenient for under the effect of gravity, and then makes the coarse sand discharge the inner chamber through first discharge gate, has further improved screening efficiency.

Preferably, the water spraying end of the water suction pipe is provided with an atomization spray head, the water suction pipe is provided with a one-way valve, and the one-way valve is positioned between the water suction end and the piston. So set up, at the in-process of grit screening, be convenient for evenly and fully drench water in the sieve fill, greatly reduced the dust, further avoided the flying upward and the diffusion of dust, promoted the cleanliness of screening in-process, the check valve is used for opening or closing the water suction pipe.

Preferably, the center line of the cam coincides with the axis of the rotating shaft, and the outer contour of the cam is elliptical. So set up, the cooperation of cam and piston converts the rotary motion of pivot into the reciprocating motion of piston, and the outline of cam is oval, has further improved the stability of the flow in the water suction pipe, is favorable to the even play water of water spray end of water suction pipe.

Preferably, the shaft is connected to the cylindrical block by a first key and the cylindrical block is connected to the first bevel gear by a second key. The device reduces the assembly operation difficulty of the transmission structure, is convenient for the assembly of the transmission structure, and is beneficial to the maintenance and the maintenance of the device.

Preferably, the centre line of the second spring coincides with the axis of the pull rod. So set up, the second spring is equivalent to the cover and establishes in the outside of pull rod, and the pull rod of being convenient for plays the guide effect to the concertina movement of second spring, has further guaranteed that the baffle is opened smoothly, and then is favorable to the coarse sand to pass through first discharge gate discharge.

Preferably, the connecting block is welded at the inlet of the sieve bucket and is connected with the second bevel gear through a third key. So set up, the assembly of the second bevel gear of being convenient for.

Preferably, the water absorbing end of the water absorbing pipe is provided with a filter screen. The arrangement is that the filter screen is used for filtering the water flow sprayed into the inner cavity, so that impurities are prevented from being mixed into sand and stone with separation.

The invention also provides a screening method using the rotary sand screening device, which comprises the following steps:

step one, starting a motor, wherein the motor drives a rotating shaft to drive a first bevel gear and a cam to rotate, the first bevel gear transmits a rotating moment to a sieve bucket through a second bevel gear, and then the sieve bucket is driven to rotate, the side wall of the cam continuously impacts a piston along with the rotation of the rotating shaft, and then water suction negative pressure is generated at a water suction end of a water suction pipe, and water in a water storage tank is sprayed into an inner cavity through the water suction pipe under the action of the water suction negative pressure;

pouring sand and stone into the sieve bucket from the feeding hole, and tightly attaching the sand and stone to the inner wall of the sieve bucket under the action of centrifugal force, wherein part of sand with the particle size smaller than the diameter of the sieve holes is sieved out from the sieve holes and discharged from the second discharging hole through the inner cavity, coarse sand is continuously attached to the inner wall of the sieve bucket, and the motor is kept to rotate for a period of time, so that the sand with the particle size smaller than the diameter of the sieve holes is fully sieved out;

and thirdly, closing the motor, enabling coarse sand to fall on the baffle plate under the action of gravity, enabling the first magnetic block to be separated from the second magnetic block, enabling the second magnetic block to compress the second spring, enabling the baffle plate to be opened, enabling the discharging channel to be communicated with the first discharging port, and enabling the baffle plate to separate the discharging channel from the first discharging port under the action of the pressure of the second spring after the coarse sand is discharged through the first discharging port.

Compared with the prior art, the rotary sand screening device and the screening method provided by the invention have the following outstanding substantive characteristics and remarkable progress:

1. according to the rotary sand screening device, the motor drives the screening hopper to rotate through the transmission structure, the traditional shaking type screening structure is optimized, noise generated in the screening process is greatly reduced, sand is clung to the inner wall of the screening hopper under the action of centrifugal force, a part of sand with the particle size smaller than the diameter of a screen hole is screened out from the screen hole and is discharged from the second discharge hole through the inner cavity, screening efficiency is greatly improved, meanwhile, the side wall of the cam continuously impacts the piston along with rotation of the rotating shaft, water suction negative pressure is generated at the water suction end of the water suction pipe, water in the water storage tank is sprayed into the inner cavity through the water suction pipe under the action of the water suction negative pressure, dust falling effect is achieved, and flying and scattering of dust in the sand and sand separation process are avoided;

2. this rotary type grit screening plant is middle screening bucket's bottom is provided with supplies coarse sand exhaust ejection of compact structure, when the output shaft of motor stops rotating, coarse sand drops on the baffle under the effect of gravity for first magnetic force piece and second magnetic force piece separate mutually, the second magnetic force piece forms the compression to the second spring, the baffle is opened, discharge channel is linked together with first discharge gate, coarse sand is discharged the back through first discharge gate, the baffle cuts off discharge channel and first discharge gate under the pressure effect of second spring, start the motor again, so reciprocal circulation has realized the periodic automatic discharge to coarse sand, manual intervention has been reduced, further the screening efficiency of grit has been improved.

Drawings

FIG. 1 is a schematic illustration of the internal structure of a rotary sand screening device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection of the first discharge port to the baffle;

FIG. 3 is a schematic diagram of the connection of the second outlet to the cavity;

FIG. 4 is a schematic view of an assembled structure of a first bevel gear and a second bevel gear;

FIG. 5 is a schematic view of the assembly of the cam and shaft;

fig. 6 is a partially enlarged view at a in fig. 1.

Reference numerals: the water storage tank 2, the inner cavity 3, the feed inlet 4, the baffle 5, the first discharge outlet 6, the water suction pipe 7, the motor 8, the rotating shaft 9, the cam 10, the piston 11, the first spring 12, the cylindrical block 13, the first bevel gear 14, the second bevel gear 15, the connecting block 16, the sieve bucket 17, the supporting block 18, the first magnetic block 19, the pull rod 20, the baffle 21, the second magnetic block 22, the second spring 23, the buffer block 24 and the second discharge outlet 25.

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

The rotary sand screening device shown in the figures 1-6 is used for driving the screening hopper to rotate through the transmission structure by utilizing the motor in the civil engineering construction process, so that the working noise is reduced. The screening device is additionally provided with a spraying structure, so that dust flying and diffusing in the sand-stone separation process are avoided. Meanwhile, a discharging structure for discharging coarse sand is arranged at the bottom of a screening bucket in the screening device, when an output shaft of a motor stops rotating, the coarse sand falls on a baffle plate under the action of gravity, so that a first magnetic block and a second magnetic block are separated, the second magnetic block compresses a second spring, the baffle plate is opened, and a discharging channel is communicated with a first discharging hole; after coarse sand is discharged from the first discharge port, the baffle plate cuts off the discharge channel from the first discharge port under the pressure action of the second spring. The motor is started again, and the reciprocating circulation is performed, so that the periodic automatic discharge of coarse sand is realized, the manual intervention is reduced, and the screening efficiency of sand and stone is further improved.

As shown in fig. 1, a rotary sand screening device includes a housing 1, a screen assembly, and a spray arrangement. The top of the shell 1 is provided with a feed inlet 4 for sand and stone to enter. The interior of the housing 1 has an interior cavity 3 in which the screen assemblies are placed. As shown in connection with fig. 2 and 3, the bottom of the inner chamber 3 is provided with a first discharge opening 6 and a second discharge opening 25.

As shown in fig. 1 in combination with fig. 2, the screen assembly includes a screen bucket 17, a motor 8 and a drive structure. The side wall of the sieve bucket 17 is provided with sieve holes. The inlet of the sieve hopper 17 is connected with the feed inlet 4. The outlet of the sieve bucket 17 is provided with a discharging structure. The discharging structure is connected with the first discharging hole 6 through a baffle 5. The motor 8 is fixedly mounted on the housing 1. The output shaft of the motor 8 is connected with the sieve bucket 17 through a transmission structure.

As shown in fig. 4, the transmission structure includes a rotation shaft 9, a first bevel gear 14, and a second bevel gear 15. The rotating shaft 9 is connected with the output shaft of the motor 8. The first bevel gear 14 is coupled to the rotating shaft 9 through a cylindrical block 13. The second bevel gear 15 is connected to a sieve bucket 17 via a connecting block 16. The first bevel gear 14 meshes with the second bevel gear 15.

As shown in fig. 1, the spray structure includes a water storage tank 2 and a water suction pipe 7. The water storage tank 2 is located outside the housing 1. The water absorbing end of the water absorbing pipe 7 is connected with the water storage tank 2. The water spraying end of the water suction pipe 7 is connected with the inner cavity 3. As shown in fig. 5, the suction pipe 7 is provided with an opening. A piston 11 is arranged in the opening. The piston 11 is connected to the barrel 7 by a first spring 12. The rotating shaft 9 is provided with a cam 10. The cam 10 rotates with the rotation of the rotation shaft 9. The piston 11 is located directly above the cam 10.

Therefore, the screening device not only optimizes the traditional shaking type screening structure, but also greatly reduces noise generated in the screening process, sand and stone cling to the inner wall of the screening bucket under the action of centrifugal force, and part of sand with particle size smaller than the diameter of the screen holes is screened out from the screen holes and discharged from the second discharge port through the inner cavity, so that the screening efficiency is greatly improved. Meanwhile, the side wall of the cam continuously impacts the piston along with the rotation of the rotating shaft, so that water suction negative pressure is generated at the water suction end of the water suction pipe, water in the water storage tank is sprayed into the inner cavity through the water suction pipe under the action of the water suction negative pressure, the dust settling effect is achieved, and dust flying and scattering in the sand and stone separation process are avoided.

As shown in fig. 6, the outfeed structure comprises a support block 18 and a baffle 21. The supporting block 18 is connected with the outlet of the sieve bucket 17. The inside of the supporting block 18 is provided with a discharging channel which is connected with the sieve hopper 17 and the first discharging hole 6. The inner wall of the support block 18 is provided with a sliding groove. The bottom of the sliding groove is provided with a first magnetic block 19. A baffle plate 21 is located at the outlet of the discharge channel. The baffle plate 21 is provided with a pull rod 20. The end of the pull rod 20 is provided with a second magnetic block 22. The second magnetic block 22 is magnetically coupled to the first magnetic block 19. A second spring 23 is arranged in the sliding groove. One end of the second spring 23 is connected to the second magnetic block 22. The other end of the second spring 23 is connected to the support block 18.

Wherein the sieve holes are distributed on the side wall of the sieve bucket 17 at equal intervals. As shown in fig. 1, the bottom of the sieve bucket 17 has a conical cylindrical shape. The middle section of the sieve bucket 17 is cylindrical. So set up, the sand that the particle diameter of being convenient for is less than the sieve mesh diameter sieves to inner chamber 3 in evenly, is favorable to separating sand and coarse sand fast. The cylindrical middle section of the sieve bucket 17 is beneficial to the coarse sand to be clung to the inner wall of the sieve bucket 17 under the action of centrifugal force. The bottom of the screening bucket 17 is cone-shaped, so that coarse sand is collected in the discharge channel, the baffle plate 21 is conveniently and smoothly opened under the action of gravity, the coarse sand is discharged out of the inner cavity 3 through the first discharge port 6, and screening efficiency is further improved.

The water spraying end of the water suction pipe 7 is provided with an atomization nozzle. The suction pipe 7 is provided with a one-way valve. The one-way valve is located between the water-absorbing end and the piston 11. So set up, at the in-process of grit screening, be convenient for evenly and fully drench the sieve fill 17 with water in, greatly reduced the dust, further avoided the flying upward and the diffusion of dust, promoted the cleanliness of screening in-process. The one-way valve is used to open or close the suction tube 7.

As shown in fig. 2, the baffle 5 is provided with a buffer block 24. The buffer block 24 is located directly below the barrier plate 21. So set up, the buffer board is used for forming the buffering to baffle 21 decurrent motion, is favorable to reducing baffle 21 to baffle 5's impact, and the coarse sand of being convenient for is discharged from first discharge gate 6 through the discharge channel, has further improved screening plant operational stability.

As shown in fig. 5, the center line of the cam 10 coincides with the axis of the rotary shaft 9. The outer profile of the cam 10 is oval. So arranged, the cooperation of the cam 10 and the piston 11 converts the rotational movement of the shaft 9 into a reciprocating movement of the piston 11. The outer contour of the cam 10 is elliptical, so that the flow stability in the water suction pipe 7 is further improved, and uniform water outlet at the water spraying end of the water suction pipe 7 is facilitated. The water absorbing end of the water absorbing pipe 7 can be provided with a filter screen. So set up, the filter screen is used for carrying out the filtration to the rivers that spout into in the inner chamber 3, has avoided impurity to mix in the grit of taking the separation.

In order to further reduce the difficulty of assembling the transmission structure, the rotating shaft 9 is connected with the cylindrical block 13 through a first key, and the cylindrical block 13 is connected with the first bevel gear 14 through a second key. The device reduces the assembly operation difficulty of the transmission structure, is convenient for the assembly of the transmission structure, and is beneficial to the maintenance and the maintenance of the device.

The connection block 16 may be welded at the inlet of the sieve hopper 17. The connection block 16 is connected to the second bevel gear 15 by a third key. So arranged, the assembly of the second bevel gear 15 is facilitated.

In order to further improve the stability of the second spring 23 in the telescopic movement, the centre line of the second spring 23 coincides with the axis of the pull rod 20. So set up, second spring 23 is equivalent to the cover and establishes in the outside of pull rod 20, and the pull rod 20 of being convenient for plays the guide effect to the concertina movement of second spring 23, has further guaranteed that baffle 21 is opened smoothly, and then is favorable to the coarse sand to pass through first discharge gate 6 and discharge.

When the rotary sand screening device provided by the embodiment of the invention is used, the method comprises the following steps:

For example, when the rotary sand screening device is used, if dust fall is needed, a sufficient amount of water is filled in the water storage tank 2, an external power supply is connected to the motor 8, and the motor 8 is started. The sand and stone materials to be screened are poured from the feed inlet 4, the output shaft of the motor 8 drives the rotating shaft 9 to rotate, and then the cam 10 is carried to continuously squeeze the piston 11. The piston 11 receives the elastic acting force of the first spring 12 and is always attached to the cam 10, so that the piston 11 is clamped with the water suction pipe 7 intermittently, the water suction end and the water spray end of the water suction pipe 7 are both provided with one-way valves, the water suction end is a liquid inlet one-way valve, and the water spray end is a liquid outlet one-way valve.

When the piston 11 slides downwards, negative pressure is formed in the water suction pipe 7, so that water in the water storage tank 2 is sucked; when the piston 11 slides upwards, liquid is extruded to the atomizing nozzle at the water spraying end, and sand is sprayed through the atomizing nozzle to be wetted.

The rotating shaft 9 drives the first bevel gear 14 on the cylindrical block 13 to rotate simultaneously when rotating, and the torque of the output shaft of the motor 8 is transmitted to the sieve bucket 17 through meshing with the second bevel gear 15 to drive the sieve bucket 17 to rotate to generate centrifugal force. Because the sieve bucket 17 drives the supporting block 18 and the baffle plate 21 to rotate when rotating, as shown in fig. 5, the inside of the supporting block 18 is in an inclined plane shape, and sand and stone are thrown up through the inclined plane under the action of rotation inertia, so that the sand and stone which are wetted and added with mass are screened and filtered through the sieve bucket 17, and the sand and stone are screened and filtered after being wetted and added with mass, so that sand can be prevented from floating and the effect of dust fall can be achieved.

In the actual use process, if dust fall is not needed, the water storage tank 2 can not be filled with water, or the one-way valve is kept closed, and the screening device only performs rotary screening.

When the rotation speed of the motor 8 is reduced or the motor 8 is turned off, the coarse sand which is not filtered falls onto the baffle plate 21 without the effect of centrifugal force, and the baffle plate 21 pulls the pull rod 20 downward. The pull rod 20 is impacted by a large weight to slide downwards, so that the second magnetic block 22 is separated from the first magnetic block 19, the baffle plate 21 continuously drives coarse sand to slide downwards to compress the second spring 23 for charging, the baffle plate 21 enters the baffle plate 5 to be smashed on the buffer block 24, the coarse sand is shaken down, and the coarse sand is discharged from the discharge hole 6. At this time, the weight of the baffle plate 21 is insufficient to pull the second spring 23, and the second spring 23 with elastic potential energy pulls the second magnetic block 22 upwards, so that the second magnetic block 23 is reset, and the second magnetic block 22 is again attracted with the first magnetic block 19 and enters the next screening cycle.

The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be provided in addition to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which are within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.

Claims

1. The rotary sand screening device is characterized by comprising a shell, a screening assembly and a spraying structure for spraying water into the shell;

when the sieve hopper is in a closed state, a baffle plate in the discharging structure seals the discharging channel to separate the sieve hopper from the first discharging port;

the baffle plate is provided with a buffer block, and the buffer block is positioned right below the baffle plate;

the transmission structure comprises a rotating shaft, a first bevel gear and a second bevel gear, wherein the rotating shaft is connected with an output shaft of the motor, the first bevel gear is connected with the rotating shaft through a cylindrical block, the second bevel gear is connected with the sieve bucket through a connecting block, and the first bevel gear is meshed with the second bevel gear;

the spray structure comprises a water storage tank and a water suction pipe, wherein the water storage tank is positioned on the outer side of the shell, the water suction end of the water suction pipe is connected with the water storage tank, the water spray end of the water suction pipe is connected with the inner cavity, an opening is formed in the water suction pipe, a piston is arranged in the opening and connected with the water suction pipe through a first spring, a cam is arranged on the rotating shaft and rotates along with the rotation of the rotating shaft, and the piston is positioned right above the cam.

2. The rotary sand and stone screening device according to claim 1, wherein the discharging structure comprises a supporting block and a baffle plate, the supporting block is connected with an outlet of the sieve bucket, a discharging channel for connecting the sieve bucket and the first discharging port is arranged in the supporting block, a sliding groove is formed in the inner wall of the supporting block, a first magnetic block is arranged at the bottom of the sliding groove, the baffle plate is positioned at the outlet of the discharging channel, a pull rod is arranged on the baffle plate, a second magnetic block is arranged at the tail end of the pull rod, the second magnetic block is connected with the first magnetic block through magnetic force, a second spring is arranged in the sliding groove, one end of the second spring is connected with the second magnetic block, and the other end of the second spring is connected with the supporting block.

3. The rotary sand screening device according to claim 1, wherein the screen holes are arranged on the side wall of the screen bucket at equal intervals, the bottom of the screen bucket is cone-shaped, and the middle section of the screen bucket is cylinder-shaped.

4. The rotary sand screening device of claim 1, wherein the water spraying end of the water suction pipe is provided with an atomization nozzle, the water suction pipe is provided with a one-way valve, and the one-way valve is positioned between the water suction end and the piston.

5. The rotary sand screening device of claim 1, wherein a center line of the cam coincides with an axis of the rotating shaft, and an outer contour of the cam is elliptical.

6. The rotary sand screening device of claim 1, wherein the shaft is coupled to a cylindrical block via a first key and the cylindrical block is coupled to a first bevel gear via a second key.

7. The method of screening a rotary sand screening device according to claim 2, comprising: