CN114192287B - Rotary sand and stone screening device and screening method - Google Patents

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 screening device and screening method

technical field

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

Background technique

In the process of civil engineering construction, a large amount of sand and gravel with different particle sizes are required to make common building materials such as concrete and mortar. Gravel refers to a loose mixture of sand grains and gravel. In geology, mineral or rock particles with a particle size of 0.074mm-2mm are usually called sand, and mineral or rock particles with a particle size larger than 2mm are called gravel or breccia. In order to ensure the various performances of construction materials, it is necessary to control the proportion of sand and gravel particle size when making and processing concrete, and use a separation device to screen sand and gravel so that the concrete meets production standards. In addition, universities and scientific research institutes also need to use a large amount of sand and gravel soil with different particle sizes when conducting tests on rock and soil, so screening devices are widely used in the field of civil engineering technology.

For example, Chinese patent document CN211330157U discloses a sand screening device used in civil engineering construction. The sand screening device includes a fixed base plate. The bottom of the fixed substrate is fixedly provided with supporting legs. A support frame is fixedly installed on the top of the fixed substrate. The inside of the support frame is fixedly installed with a receiving plate at an angle of 30 degrees relative to the fixed base plate. The inside of the support frame is fixedly equipped with a movable rod. Two pentagonal connecting rods are fixedly installed on the outside of the movable rod through bearings. By setting the helical blades inside the sand screening device that can be in contact with the receiving plate, it is beneficial to squeeze the sand or substances that are stuck together in the sand, and avoid the sand that is stuck together and difficult to screen during the sand screening process. points, resulting in a waste of sand.

As another example, a kind of automatic sand screening machine is disclosed in the Chinese patent document CN211385155U. The sand screening machine includes a first sand screening part, a second sand screening part, a sand pumping part and a sand crushing device. When using this sand screening machine, the sand is pumped to the first sand screening part through the sand pumping part, and the sand that has been screened by the first sand screening part will directly enter the second sand screening part for sand screening, while the large grains of sand and sand The sand will be sent to the sand crushing device by the first sand screening part for crushing treatment, and then enter the second sand screening part from the sand crushing device for sand screening, and finally the required sand will pass through the filter of the second sand screening part It enters the sand discharge outlet, and the unnecessary sand enters the waste material outlet from the bottom of the second sand screening part. The sand screening machine not only has the functions of pumping sand, screening sand, and crushing sand blocks, but also has a simple structure and high cost performance. In addition, it does not need secondary sand screening, thereby improving the working efficiency of sand screening.

However, during the use of the above-mentioned sand screening device and sand screening machine, the dust will fly and spread, thereby polluting the surrounding environment and affecting the health of operators. Sand and gravel separation equipment in the prior art mostly adopts a swing type or a shaking type, which is noisy during use. Especially the shaking type separation equipment not only has a lot of noise, but also easily shakes out the sand and gravel. After the separation process is completed, the site needs to be further cleaned, which increases the workload. In addition, the existing separation equipment is difficult to achieve periodic discharge of coarse-grained sand and gravel, and manual intervention is required to clean the coarse-grained gravel that has not been screened, which in turn affects the separation efficiency of sand and gravel.

In summary, in the process of civil engineering construction, how to design a sand and gravel separation equipment to reduce working noise, avoid dust flying and diffusion during the sand and gravel separation process, and at the same time optimize the structure of the sieve bucket to realize the separation of coarse particles Periodic discharge of sand and gravel, further improving the screening efficiency of sand and gravel, has become a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a sand and gravel separation equipment for the process of civil engineering construction, to reduce working noise, avoid dust flying and diffusion during the sand and gravel separation process, and optimize the structure of the sieve bucket to realize the separation of coarse particles. The periodic discharge of sand and gravel further improves the screening efficiency of sand and gravel.

In order to achieve the above object, the present invention adopts the following scheme: a rotary sand and gravel screening device is proposed, including a casing, a screening assembly and a spray structure for spraying water into the casing;

The top of the casing is provided with a material inlet for sand and gravel to enter, and the inside of the casing has an inner cavity for placing a screening assembly, and the bottom of the inner cavity is equipped with a first discharge port and a second discharge port. mouth;

The screening assembly includes a sieve bucket, a motor and a transmission structure, the side wall of the sieve bucket is provided with screen holes, the inlet of the sieve bucket is connected to the material inlet, and the outlet of the sieve bucket is provided with a discharge structure , the discharge structure is connected to the first discharge port through a baffle plate, the motor is fixedly mounted on the housing, and the output shaft of the motor is connected to the sieve bucket through a transmission structure;

The discharge structure has an open state and a closed state. In the open state, the discharge channel in the discharge structure is connected to the sieve bucket and the first discharge port;

When in a closed state, the barrier plate in the discharge structure closes the discharge channel and separates the sieve bucket from the first discharge port.

Preferably, the discharge structure includes a support block and a barrier plate, the support block is connected to the outlet of the sieve bucket, the inside of the support block has a discharge channel connecting the sieve bucket and the first discharge port, and the inner wall of the support block is provided with a sliding groove , the bottom of the sliding groove is provided with a first magnetic block, the barrier plate is located at the outlet of the discharge channel, a pull rod is arranged on the barrier plate, and a second magnetic block is provided at the end of the pull rod, and the second magnetic block is connected with the first magnetic block by magnetic force. connected, a second spring is arranged in the slide 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 includes a rotating shaft, a first bevel gear and a second bevel gear, the rotating shaft is connected with the output shaft of the motor, the first bevel gear is connected with the rotating shaft through a cylindrical block, and the second bevel gear is connected with the sieve bucket through a connecting block, The first bevel gear meshes with the second bevel gear.

Preferably, the spraying structure includes a water storage tank and a water suction pipe, the water storage tank is located outside the housing, 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, and the water suction pipe is provided with an opening. A piston is arranged inside, the piston is connected with the water suction pipe through the first spring, a cam is arranged on the rotating shaft, the cam rotates with the rotation of the rotating shaft, and the piston is located directly above the cam.

Preferably, a buffer block is arranged on the baffle, and the buffer block is located directly below the barrier plate. In this way, the buffer plate is used to buffer the downward movement of the barrier plate, which is beneficial to reduce the impact of the barrier plate on the baffle plate, and facilitates the discharge of coarse sand from the first discharge port through the discharge channel, further improving the operation of the screening device. stability.

Preferably, the sieve holes are arranged at equal intervals on the side wall of the sieve bucket, the bottom of the sieve bucket is in the shape of a cone, and the middle section of the sieve bucket is in the shape of a cylinder. Such setting facilitates the even screening of sand with a particle size smaller than the diameter of the sieve hole into the inner cavity, which is conducive to the rapid separation of sand and coarse sand. On the inner wall of the sieve bucket, the bottom of the sieve bucket is in the shape of a cone, which is conducive to the collection of coarse sand in the discharge channel, which is convenient for the coarse sand to open the barrier plate smoothly under the action of gravity, so that the coarse sand passes through the first discharge port. The inner cavity is discharged, which further improves the screening efficiency.

Preferably, the spray end of the water suction pipe is provided with an atomizing nozzle, and the water suction pipe is provided with a one-way valve, which is located between the water suction end and the piston. With this setting, in the process of screening sand and gravel, it is convenient to pour water evenly and fully into the sieve bucket, which greatly reduces dust, further avoids the flying and diffusion of dust, and improves the cleanliness during the screening process. The directional valve is used to open or close the suction pipe.

Preferably, the centerline of the cam coincides with the axis of the rotating shaft, and the outer contour of the cam is elliptical. In this way, the cooperation between the cam and the piston converts the rotational motion of the rotating shaft into the reciprocating motion of the piston. The outer contour of the cam is oval, which further improves the stability of the flow in the suction pipe and is conducive to uniform water discharge from the water spray end of the suction pipe. .

Preferably, the rotating shaft is connected with the cylindrical block through the first key, and the cylindrical block is connected with the first bevel gear through the second key. Such setting reduces the difficulty of the assembly operation of the transmission structure, facilitates the assembly of the transmission structure, and facilitates the maintenance and maintenance of the device.

Preferably, the centerline of the second spring coincides with the axis of the pull rod. In this way, the second spring is equivalent to being sleeved on the outside of the pull rod, which is convenient for the pull rod to play a guiding role in the telescopic movement of the second spring, and further ensures that the barrier plate is opened smoothly, which in turn facilitates the discharge of coarse sand through the first discharge port .

Preferably, the connection block is welded at the entrance of the sieve bucket, and the connection block is connected with the second bevel gear through a third key. Such arrangement facilitates the assembly of the second bevel gear.

Preferably, the water suction end of the water suction pipe is provided with a filter screen. With such arrangement, the filter screen is used to filter the water flow sprayed into the inner cavity, so as to prevent impurities from being mixed into the separated sand and gravel.

The present invention also proposes a screening method using the aforementioned rotary sand screening device, comprising:

Step 1: Start the motor, the motor drives the shaft to drive the first bevel gear and the cam to rotate, the first bevel gear transmits the rotational torque to the screen bucket through the second bevel gear, and then drives the screen bucket to rotate, the side wall of the cam rotates with the rotation of the shaft Constantly hitting the piston, and then generating a negative water suction pressure at the water suction end of the water suction pipe, the 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;

Step 2: Pour sand and gravel into the sieve bucket from the feed port, and the sand and gravel cling to the inner wall of the sieve bucket under the action of centrifugal force, and some of the sand whose particle size is smaller than the diameter of the sieve hole is screened out from the sieve hole and passes through the inner cavity Discharged from the second discharge port, the coarse sand continues to cling to the inner wall of the sieve bucket, and the motor is kept rotating for a period of time, so that the sand whose particle size is smaller than the diameter of the sieve hole is fully screened out;

Step 3. Turn off the motor, and the coarse sand falls on the barrier plate under the action of gravity, so that the first magnetic block and the second magnetic block are separated, and the second magnetic block compresses the second spring, and the barrier plate is opened. The material passage is connected with the first discharge port, and after the coarse sand is discharged through the first discharge port, the blocking plate isolates the discharge channel from the first discharge port under the pressure of the second spring.

Compared with the prior art, a rotary sand screening device and screening method provided by the present invention have the following prominent substantive features and significant progress:

1. The motor in the rotary sand screening device drives the screen bucket to rotate through the transmission structure, which optimizes the traditional shaking screening structure and greatly reduces the noise generated during the screening process. The sand is tightly packed under the action of centrifugal force. Attached to the inner wall of the sieve bucket, a part of the sand whose particle size is smaller than the diameter of the sieve hole is screened out from the sieve hole and discharged from the second outlet through the inner cavity, which greatly improves the screening efficiency. The rotation of the piston continuously hits the piston, and then generates a negative water suction pressure at the water suction end of the water suction pipe. Flying and spreading of dust;

2. The bottom of the sieve bucket in the rotary sand screening device is provided with a discharge structure for the discharge of coarse sand. When the output shaft of the motor stops rotating, the coarse sand falls on the baffle plate under the action of gravity, so that The first magnetic block is separated from the second magnetic block, the second magnetic block compresses the second spring, the barrier plate is opened, the discharge channel is connected with the first discharge port, and the coarse sand is discharged through the first discharge port , under the pressure of the second spring, the barrier plate separates the discharge channel from the first discharge port, and starts the motor again. This reciprocating cycle realizes periodic automatic discharge of coarse sand, reduces manual intervention, and further The screening efficiency of sand and gravel is improved.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of a rotary sand screening device in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the connection between the first outlet and the baffle;

Fig. 3 is a schematic diagram of the connection between the second outlet and the inner cavity;

Fig. 4 is a schematic diagram of the assembly structure of the first bevel gear and the second bevel gear;

Fig. 5 is a schematic diagram of the assembly structure of the cam and the rotating shaft;

Fig. 6 is a partially enlarged view of A in Fig. 1 .

Reference signs: shell 1, water storage tank 2, inner cavity 3, material inlet 4, baffle plate 5, first material outlet 6, water suction pipe 7, motor 8, rotating shaft 9, cam 10, piston 11, first Spring 12, cylindrical block 13, first bevel gear 14, second bevel gear 15, connection block 16, screen bucket 17, support block 18, first magnetic block 19, pull rod 20, barrier plate 21, second magnetic block 22, The second spring 23, the buffer block 24, and the second discharge port 25.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

A rotary sand and gravel screening device as shown in Figure 1-6 is used in the process of civil engineering construction to use the motor to drive the screen bucket to rotate through the transmission structure, reducing the working noise. The screening device is also equipped with a spray structure to avoid the flying and spreading of dust during the sand and gravel separation process. At the same time, the bottom of the screen bucket in the screening device is provided with a discharge structure for the discharge of coarse sand. When the output shaft of the motor stops rotating, the coarse sand falls on the barrier plate under the action of gravity, so that the first magnetic block Separated from the second magnetic block, the second magnetic block compresses the second spring, the barrier plate is opened, and the discharge channel is connected with the first discharge port; after the coarse sand is discharged through the first discharge port, the barrier plate is Under the pressure of the second spring, the discharge channel is separated from the first discharge port. Start the motor again, so that the reciprocating cycle realizes the periodic automatic discharge of coarse sand, reduces manual intervention, and further improves the screening efficiency of sand and gravel.

As shown in FIG. 1 , a rotary gravel screening device includes a housing 1 , a screening assembly and a spraying structure. The top of the casing 1 is provided with an inlet 4 for sand and gravel to enter. Inside the housing 1 is an inner cavity 3 for placing a screening assembly. As shown in FIG. 2 and FIG. 3 , a first discharge port 6 and a second discharge port 25 are provided at the bottom of the inner cavity 3 .

As shown in FIG. 1 in conjunction with FIG. 2 , the screening assembly includes a screening bucket 17 , a motor 8 and a transmission structure. Sieve holes are arranged on the side wall of the sieve bucket 17 . The entrance of the sieve bucket 17 is connected with the feed port 4 . The outlet of the sieve bucket 17 is provided with a discharge structure. The discharge structure is connected with the first discharge port 6 through the baffle plate 5 . The motor 8 is fixedly mounted on the casing 1 . The output shaft of the motor 8 is connected with the screen bucket 17 through a transmission structure.

As shown in FIG. 4 , the transmission structure includes a rotating 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 with the rotating shaft 9 through the cylindrical block 13 . The second bevel gear 15 is connected with the screen bucket 17 through the 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 casing 1 . The suction end of the water suction pipe 7 links to each other with the water storage tank 2 . The water spray end of the water suction pipe 7 links to each other with the inner cavity 3 . As shown in FIG. 5 , the water suction pipe 7 is provided with an opening. A piston 11 is arranged in the opening. The piston 11 is connected with the water suction pipe 7 through the first spring 12 . A cam 10 is arranged on the rotating shaft 9 . The cam 10 rotates with the rotation of the rotating shaft 9 . The piston 11 is located directly above the cam 10 .

In this way, in addition to optimizing the traditional vibrating screening structure, the screening device greatly reduces the noise generated during the screening process. The sand with the diameter of the sieve hole is sieved out from the sieve hole and discharged from the second outlet through the inner cavity, which greatly improves the screening efficiency. At the same time, the side wall of the cam continuously hits the piston with the rotation of the rotating shaft, and then generates a suction negative pressure at the suction end of the water suction pipe. The effect is to avoid the flying and spreading of dust during the separation of sand and gravel.

As shown in FIG. 6 , the discharge structure includes a support block 18 and a barrier plate 21 . The support block 18 is connected to the outlet of the screen bucket 17 . The inside of the support block 18 has a discharge channel connecting the sieve bucket 17 and the first discharge port 6 . The inner wall of the support block 18 is provided with a slide groove. A first magnetic force block 19 is provided at the bottom of the sliding groove. The baffle plate 21 is located at the outlet of the discharge channel. A tie rod 20 is arranged on the barrier plate 21 . The end of the pull rod 20 is provided with a second magnetic block 22 . The second magnetic block 22 is connected with the first magnetic block 19 through magnetic force. A second spring 23 is arranged in the sliding groove. One end of the second spring 23 is connected with the second magnetic block 22 . The other end of the second spring 23 is connected with the supporting block 18 .

Wherein, the sieve holes are arranged at equal intervals on the side wall of the sieve bucket 17 . As shown in FIG. 1 , the bottom of the sieve bucket 17 is in the shape of a cone. The middle section of the sieve bucket 17 is cylindrical. Such an arrangement facilitates evenly screening the sand whose particle size is smaller than the diameter of the sieve hole into the inner chamber 3 , and facilitates rapid separation of the sand from the coarse sand. The middle section of the sieve bucket 17 has a cylindrical shape, which is beneficial for the coarse sand to cling to the inner wall of the sieve bucket 17 under the action of centrifugal force. The bottom of the sieve bucket 17 is in the shape of a cone, which is conducive to the collection of coarse sand in the discharge channel, and facilitates the smooth opening of the barrier plate 21 by the coarse sand under the action of gravity, so that the coarse sand is discharged from the inner cavity 3 through the first discharge port 6 , to further improve the screening efficiency.

The spray end of the water suction pipe 7 is provided with an atomizing nozzle. The water suction pipe 7 is provided with a one-way valve. The one-way valve is located between the suction end and the piston 11. Such setting facilitates evenly and fully pouring water into the sieve bucket 17 during the screening of sand and gravel, greatly reducing dust, further avoiding the flying and spreading of dust, and improving the cleanliness during the screening process. The one-way valve is used to open or close the water suction pipe 7.

As shown in FIG. 2 , a buffer block 24 is arranged on the baffle plate 5 . The buffer block 24 is located right below the blocking plate 21 . In this way, the buffer plate is used to buffer the downward movement of the barrier plate 21, which is beneficial to reduce the impact of the barrier plate 21 on the baffle plate 5, and facilitates the discharge of coarse sand from the first discharge port 6 through the discharge channel, further improving the The stability of the screening device operation.

As shown in FIG. 5 , the centerline of the cam 10 coincides with the axis of the rotating shaft 9 . The outer profile of the cam 10 is oval. In this way, the cooperation between the cam 10 and the piston 11 converts the rotary motion of the rotating shaft 9 into the reciprocating motion of the piston 11 . The outer profile of the cam 10 is elliptical, which further improves the stability of the flow in the water suction pipe 7, and helps the water spray end of the water suction pipe 7 to evenly discharge water. The suction end of the water suction pipe 7 can also be provided with a filter screen. With such arrangement, the filter screen is used to filter the water flow sprayed into the inner cavity 3, so as to prevent impurities from being mixed into the separated sand and gravel.

In order to further reduce the assembly difficulty of the transmission structure, the rotating shaft 9 is connected with the cylindrical block 13 through the first key, and the cylindrical block 13 is connected with the first bevel gear 14 through the second key. Such setting reduces the difficulty of the assembly operation of the transmission structure, facilitates the assembly of the transmission structure, and facilitates the maintenance and maintenance of the device.

The connection block 16 can be welded at the inlet of the sieve bucket 17 . The connection block 16 is connected with the second bevel gear 15 through the third key. Such arrangement facilitates the assembly of the second bevel gear 15 .

In order to further improve the stability of the second spring 23 during telescopic movement, the center line of the second spring 23 coincides with the axis of the pull rod 20 . In this way, the second spring 23 is equivalent to being sleeved on the outside of the pull rod 20, which facilitates the pull rod 20 to play a guiding role in the telescopic movement of the second spring 23, and further ensures that the barrier plate 21 is opened smoothly, thereby facilitating coarse sand to pass through the second spring 23. A discharge port 6 is discharged.

When a rotary sand screening device provided in an embodiment of the present invention is used, it includes the following steps:

Step 1: Start the motor, the motor drives the shaft to drive the first bevel gear and the cam to rotate, the first bevel gear transmits the rotational torque to the screen bucket through the second bevel gear, and then drives the screen bucket to rotate, the side wall of the cam rotates with the rotation of the shaft Constantly hitting the piston, and then generating a negative water suction pressure at the water suction end of the water suction pipe, the 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;

Step 2: Pour sand and gravel into the sieve bucket from the feed port, and the sand and gravel cling to the inner wall of the sieve bucket under the action of centrifugal force, and some of the sand whose particle size is smaller than the diameter of the sieve hole is screened out from the sieve hole and passes through the inner cavity Discharged from the second discharge port, the coarse sand continues to cling to the inner wall of the sieve bucket, and the motor is kept rotating for a period of time, so that the sand whose particle size is smaller than the diameter of the sieve hole is fully screened out;

Step 3. Turn off the motor, and the coarse sand falls on the barrier plate under the action of gravity, so that the first magnetic block and the second magnetic block are separated, and the second magnetic block compresses the second spring, and the barrier plate is opened. The material passage is connected with the first discharge port, and after the coarse sand is discharged through the first discharge port, the blocking plate isolates the discharge channel from the first discharge port under the pressure of the second spring.

For example, when the rotary gravel screening device is in use, if it is necessary to reduce dust, fill the water storage tank 2 with a sufficient amount of water, connect the motor 8 with an external power supply, and start the motor 8. The gravel material to be screened is poured from the feed port 4, the output shaft of the motor 8 drives the rotating shaft 9 to rotate, and then the cam 10 continues to squeeze the piston 11. The piston 11 is always attached to the cam 10 by the elastic force of the first spring 12, so that the piston 11 is intermittently engaged with the water suction pipe 7, and the water suction end and the water spray end of the water suction pipe 7 are all provided with one-way valves, and the water suction end It is a liquid inlet one-way valve, and the water spray end is a liquid outlet one-way valve.

When the piston 11 slides down, it will make the inside of the water suction pipe 7 form a negative pressure, thereby absorbing the water in the water storage tank 2; and when the piston 11 slides up, it will squeeze the liquid to the atomizing nozzle at the water spray end, It is sprayed out through the atomizing nozzle to wet the gravel.

When the rotating shaft 9 rotates, it simultaneously drives the first bevel gear 14 on the cylindrical block 13 to rotate, and through meshing with the second bevel gear 15, the torque of the output shaft of the motor 8 is transmitted to the sieve bucket 17, which drives the sieve bucket 17 to rotate to produce centrifugal force. Because the screen bucket 17 rotates to drive the support block 18 and the barrier plate 21 to rotate, as shown in Figure 5, the inside of the support block 18 is in the shape of an inclined plane, through the centrifugal force, under the action of the rotation inertia, the sand and gravel are thrown up through the inclined plane, Thereby the gravel that is drenched to increase the quality is carried out sub-sieve filtration through the sieve bucket 17, and the sub-sieve filtration is carried out after the gravel is drenched to increase the quality, which can prevent the sand from floating in the air and play the effect of reducing dust.

In actual use, if dust reduction is not required, no water can be filled in the water storage tank 2, or the one-way valve is kept closed, and the screening device only performs rotary screening.

When the rotating speed of the motor 8 is reduced or the motor 8 is turned off, under the action of no centrifugal force, the unfiltered coarse sand falls onto the blocking plate 21, and the blocking plate 21 pulls the pull rod 20 downward. The pull rod 20 slides downward under the impact of a large weight, so that the second magnetic block 22 is separated from the first magnetic block 19, so that the blocking plate 21 continues to drive the coarse sand to slide down and compress the second spring 23 to charge, and makes the blocking plate 21 enters in the baffle plate 5 and smashes on the buffer block 24, shakes the coarse sand, and discharges it from the discharge port 6. At this time, the weight of the blocking plate 21 is not enough to pull the second spring 23, and the second spring 23 with elastic potential energy will pull the second magnetic block 22 upwards, so that the second magnetic block 23 is reset, and the second magnetic block 22 is reconnected with the second magnetic block 22. A magnetic block 19 attracts and merges, and then enters the next screening cycle.

The present invention is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, the present invention can also have other implementation modes. For those skilled in the art, within the spirit and principles of the present invention, any technical solutions formed by any modifications, equivalent replacements, improvements, etc. shall be included in the protection scope of the present invention.

Claims (7)

1. A rotary sand screening device, characterized in that it comprises a housing, a screening assembly and a spray structure for spraying water into the housing; The top of the casing is provided with a material inlet for sand and gravel to enter, and the inside of the casing has an inner cavity for placing a screening assembly, and the bottom of the inner cavity is equipped with a first discharge port and a second discharge port. mouth; The screening assembly includes a sieve bucket, a motor and a transmission structure, the side wall of the sieve bucket is provided with screen holes, the inlet of the sieve bucket is connected to the material inlet, and the outlet of the sieve bucket is provided with a discharge structure , the discharge structure is connected to the first discharge port through a baffle plate, the motor is fixedly mounted on the housing, and the output shaft of the motor is connected to the sieve bucket through a transmission structure; The discharge structure has an open state and a closed state. In the open state, the discharge channel in the discharge structure is connected to the sieve bucket and the first discharge port; When in the closed state, the barrier plate in the discharge structure seals the discharge channel, separating the sieve bucket from the first discharge port; A buffer block is arranged on the baffle, and the buffer block is located directly below the barrier plate; The transmission structure includes a rotating shaft, a first bevel gear and a second bevel gear, the rotating shaft is connected with the output shaft of the motor, the first bevel gear is connected with the rotating shaft through a cylindrical block, and the second bevel gear is connected through a connecting block Connected with the sieve bucket, the first bevel gear meshes with the second bevel gear; The spray structure includes a water storage tank and a water suction pipe, the water storage tank is located outside 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, and the water suction pipe An opening is arranged on the pipe, and a piston is arranged in the opening, and the piston is connected with the water suction pipe through a first spring, and a cam is arranged on the rotating shaft, and the cam rotates with the rotation of the rotating shaft, and the piston is located at the center of the cam Directly above. 2. The rotary sand and gravel screening device according to claim 1, wherein the discharge structure includes a support block and a barrier plate, the support block is connected to the outlet of the screen bucket, and the inside of the support block There is a discharge channel connecting the sieve bucket and the first discharge port, the inner wall of the support block is provided with a sliding groove, the bottom of the sliding groove is provided with a first magnetic block, and the barrier plate is located at the outlet of the discharge channel A pull rod is arranged on the barrier plate, and a second magnetic block is arranged at the end of the pull rod, and the second magnetic block is connected with the first magnetic block through magnetic force, and a second spring is arranged in the sliding groove, so 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 and gravel screening device according to claim 1, wherein the sieve holes are arranged at equal intervals on the side wall of the sieve bucket, and the bottom of the sieve bucket is in the shape of a cone, so that The middle section of the sieve bucket is cylindrical. 4. The rotary sand and gravel screening device according to claim 1, characterized in that, the spray end of the water suction pipe is provided with an atomizing nozzle, the water suction pipe is provided with a one-way valve, and the one-way The valve is located between the suction side and the piston. 5 . The rotary gravel screening device according to claim 1 , wherein the centerline of the cam coincides with the axis of the rotating shaft, and the outer contour of the cam is elliptical. 6 . 6. The rotary sand and gravel screening device according to claim 1, wherein the rotating shaft is connected to the cylindrical block through a first key, and the cylindrical block is connected to the first bevel gear through a second key. 7. The screening method of the rotary sand and gravel screening device according to claim 2, characterized in that, comprising: Step 1: Start the motor, the motor drives the shaft to drive the first bevel gear and the cam to rotate, the first bevel gear transmits the rotational torque to the screen bucket through the second bevel gear, and then drives the screen bucket to rotate, the side wall of the cam rotates with the rotation of the shaft Constantly hitting the piston, and then generating a negative water suction pressure at the water suction end of the water suction pipe, the 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; Step 2: Pour sand and gravel into the sieve bucket from the feed port, and the sand and gravel cling to the inner wall of the sieve bucket under the action of centrifugal force, and some of the sand whose particle size is smaller than the diameter of the sieve hole is screened out from the sieve hole and passes through the inner cavity Discharged from the second discharge port, the coarse sand continues to cling to the inner wall of the sieve bucket, and the motor is kept rotating for a period of time, so that the sand whose particle size is smaller than the diameter of the sieve hole is fully screened out; Step 3. Turn off the motor, and the coarse sand falls on the barrier plate under the action of gravity, so that the first magnetic block and the second magnetic block are separated, and the second magnetic block compresses the second spring, and the barrier plate is opened. The material passage is connected with the first discharge port, and after the coarse sand is discharged through the first discharge port, the blocking plate isolates the discharge channel from the first discharge port under the pressure of the second spring.