Screening device with multi-stage screening function for clay sand treatment
By designing a screening device for clay sand treatment with multi-stage screening function, the multi-stage separation of clay sand and sand and gravel is achieved using vibrator and centrifugal force, the problem of difficulty in completely removing fine impurities and large energy consumption in the prior art is solved, and the screening quality and efficiency are improved.
Patent Information
- Application Number
- CN202411789621.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing spiral screening machines are difficult to completely remove fine impurities when screening clay sand, and when the amount is small, energy consumption is high and resources are wasted.
A screening device with multi-stage screening function is designed, including a feed chamber, a partition chamber and a multi-sieve chamber, and the multi-stage separation of clay sand and sand and gravel is achieved through vibrator and centrifugal force.
It realizes efficient screening of clay sand, removes fine impurities, improves screening quality, and reduces energy consumption when the amount is small.
Smart Images
Figure CN119525031A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of screening, in particular to a screening device for clay sand processing with a multi-stage screening function. Background Art
[0002] Clay sand is a type of molding sand classified by the foundry industry according to the mud content in the original sand. It is mainly used as an additive for molding sand and core sand for cast iron and non-ferrous metals, and has the characteristics of improving strength and molding performance. Clay sand contains quartz and harmful impurities, and the quality of clay sand directly affects the quality of cast products, the increase in output and the reduction in cost. Therefore, clay sand needs to be screened and purified before use to remove impurities in the clay sand. Existing screening devices usually use spiral separators, but when the spiral screening machine screens clay sand, some sand and gravel with smaller particles will be output from the gaps between the spirals, so that fine impurities are still retained in the clay sand. In addition, the spiral screening machine is usually used for screening in places where the amount of clay sand is large. For small amounts of clay sand, the energy consumed by using a spiral screening machine for screening is large, resulting in a lot of waste of resources. Summary of the invention
[0003] The object of the present invention is to provide a screening device for clay sand processing with a multi-stage screening function to solve the problems raised in the prior art.
[0004] To achieve the above object, the present invention provides the following technical solutions: A screening device for clay sand processing with multi-stage screening function comprises a machine body, a feed chamber is arranged on the top of the machine body, a sub-screening device is arranged on the bottom of the feed chamber, the sub-screening device comprises a sub-screening chamber, the sub-screening chamber is arranged inside the machine body, the feed chamber is communicated with the sub-screening chamber, a fixed body is arranged in the sub-screening chamber, a plurality of screen chambers are arranged in the fixed body, and the plurality of screen chambers are communicated with the sub-screening chamber.
[0005] The clay sand is transported into the feed cavity and then transported to the screening cavity through the feed cavity. When the clay sand is transported to the screening cavity, the controller controls the screening device to start, and the screening device immediately screens the clay sand to separate the clay and sand and gravel. The separated clay is output to the outside, while the sand and gravel enter the multi-screen cavity through the screening cavity, so that the sand and gravel are screened in the multi-screen cavity according to the diameter of the sand and gravel, thereby achieving a multi-stage screening effect, thereby improving the quality of clay sand screening.
[0006] Preferably, a rotating rod is provided in the feed chamber, a plurality of push plates are provided on the shaft arm of the rotating rod, and the plurality of push plates are arranged around the axis of the rotating rod. A driving motor is provided at the bottom of the feed chamber, and a driving shaft of the driving motor is connected to the rotating rod.
[0007] Preferably, a plurality of feed ports are provided on a side of the feed chamber close to the sub-screening chamber, and a ramp ring is provided on a side of the feed port close to the sub-screening chamber.
[0008] Before the clay sand is poured into the feed chamber, the controller controls the drive motor to start, and the drive shaft of the drive motor drives the rotating rod to rotate, and the rotating rod drives the push plate to rotate when it rotates. After the clay sand is poured into the feed chamber, the clay sand moves to the side close to the feed port under the rotation of the push plate, so that the clay sand moves from the feed chamber to the surface of the ramp ring. Since the ramp ring extends toward the vibration ring, the clay sand slides along the ramp ring toward the side close to the vibration ring, and finally the clay sand falls off the ramp ring and falls into the groove on the vibration ring.
[0009] Preferably, a vibration ring is provided in the sub-screening chamber, the vibration ring is arranged outside the fixed body, the top of the vibration ring is inclined toward a side close to the feed chamber, and a groove is provided on the top of the vibration ring.
[0010] Preferably, a plurality of guide blocks are provided on the top of the vibration ring, and the plurality of guide blocks are arranged around the axis of the vibration ring, a pushing cavity is provided between two adjacent guide blocks, a moving block is provided in the pushing cavity, the moving block is slidably connected with the pushing cavity, a pneumatic cylinder is provided in the pushing cavity, a pushing rod of the pneumatic cylinder is connected with the moving block, a gas tank is provided outside the body, the gas tank is connected with the gas cylinder through a pipeline, a vibrator is provided in the moving block, both sides of the guide block are inclined toward the moving block, and the height of the guide block is higher than the height of the top of the pushing cavity.
[0011] Preferably, a clay groove is provided between the fixed body and the vibration ring, a filter plate is provided in the clay groove, and a screening channel is provided on a side of the filter plate away from the clay groove.
[0012] Preferably, a plurality of connection ports are provided in the middle of the fixed body, a plurality of catchers are provided on a side of the fixed body close to the vibration ring, the plurality of catchers are arranged around the axis of the fixed body, and the catchers are arranged at an angle to the fixed body.
[0013] Preferably, the middle diameter of the multi-sieve cavity is smaller than the diameters at both ends of the multi-sieve cavity, a screening plate is provided at the bottom of the multi-sieve cavity, and a protrusion is provided at the center of the screening plate.
[0014] Preferably, a No. 1 motor is provided inside the sub-screening channel, a driving gear is provided on the driving shaft of the No. 1 motor, a main gear is provided on the outer wall of the screening plate close to the sub-screening channel, the driving gear is meshed with the main gear, and the fixed body is rotatably connected to the filter plate.
[0015] Preferably, the screening plate is provided with a first screening port, a second screening port and a third screening port in sequence from the center to the edge, the caliber of the first screening port is smaller than the caliber of the second screening port, and the caliber of the second screening port is smaller than the caliber of the third screening port.
[0016] Before the clay sand falls from the ramp ring to the vibration ring, the controller controls the vibrator on the moving block to start. After the vibrator starts, it generates vibration. The vibration will generate power on the moving block, causing materials of different particle sizes to move relative to each other. Under the action of vibration, larger particles (sand and gravel) will be subject to greater acceleration, and the sand and gravel will move to the side away from the moving block, while smaller particles (clay) may keep the moving block close to the vibration ring due to their smaller mass and smaller inertia, that is, the sand and gravel will move to the surface of the clay, thereby forming a particle stratification effect; If the clay sand falls on the guide block, since both sides of the guide block are inclined toward the moving block, and the height of the guide block is higher than the height of the top of the pushing cavity, and the vibration generated by the vibrator will be transmitted to the guide block, the clay sand on the guide block will be transported from the guide block to the side close to the moving block, and then the clay sand will eventually gather in the groove of the moving block, and realize particle stratification under the action of vibration, so as to achieve the effect of separating sand and clay; In the process of the vibrator performing particle stratification on the clay sand on the surface of the moving block, the gas tank outside the machine body transmits gas to the pneumatic cylinder in the pushing chamber through the pipeline. When the gas pressure in the pneumatic cylinder reaches the set value, the pneumatic cylinder pushes the push rod to move, and the push rod moves the moving block to the side away from the pushing chamber, thereby driving the clay sand on the surface to move during the movement of the moving block, and the clay sand is separated from the surface of the moving block under the action of the thrust. Since the mass of the sand and gravel on the clay surface is large, the greater the thrust effect it receives, the sand and gravel pass over the catcher and move to the bottom of the ramp ring. Since the clay has a small mass, it is less affected by the thrust. Therefore, after leaving the surface of the moving block, it is affected by gravity and moves to the side close to the clay groove, and then is transported to the sub-screening channel through the filter plate, and finally output through the sub-screening channel; The sand and gravel flying to the bottom of the ramp ring falls after encountering an obstruction. Since the diameter of the sand and gravel is greater than the distance between two adjacent catchers, the sand and gravel falls on the surface of the catcher. Since the catcher and the fixed body are arranged at an angle, the sand and gravel are caught by the catcher and move to the side close to the connection port, and then the sand and gravel enter the multi-screen cavity through the connection port. The middle diameter of the multi-sieve cavity is smaller than the diameters at both ends of the multi-sieve cavity, so that after entering the multi-sieve cavity, the sand and gravel are affected by the inner wall of the multi-sieve cavity, and then the sand and gravel in the multi-sieve cavity moves from the edge to the center of the multi-sieve cavity, and finally falls downward from the center of the multi-sieve cavity, so that the sand and gravel falls on the protrusion; Before the sand and gravel enter the multi-screen chamber, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the driving gear to rotate. When the driving gear rotates, it drives the main gear to mesh and transmit, thereby causing the screening plate to rotate. When the screening plate rotates, centrifugal force is generated. Since the sand and gravel fall on the protrusions first, and the screening plate is provided with the first screening port, the second screening port and the third screening port in sequence from the center to the edge, the sand and gravel move from the center to the edge of the screening plate under the action of centrifugal force. In the process of movement, the larger particles of sand and gravel have a larger mass, so they are subjected to a stronger centrifugal force during the rotation process and tend to the outside of the screening plate, while the smaller particles of sand and gravel are subjected to a weaker centrifugal force and tend to approach the center of the screening plate. Therefore, the smaller particles of sand and gravel are output from the first screening port, the medium particles of sand and gravel are output from the second screening port, and the larger particles of sand and gravel are output from the third screening port, thereby realizing multi-stage screening processing of sand and gravel, thereby screening and separating sand and gravel of different sizes, thereby improving the quality of sand and gravel screening, and realizing the separation of sand and gravel particle size through the interaction between centrifugal force and particle mass difference.
[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The vibrator will generate power on the moving block, causing materials of different particle sizes to move relative to each other. Under the action of vibration, larger particles (sand and gravel) will be subjected to greater acceleration, and the sand and gravel will move to the side away from the moving block, while smaller particles (clay) may keep the moving block close to the vibration ring due to their smaller mass and smaller inertia, that is, the sand and gravel will move to the surface of the clay, thus forming a particle stratification effect.
[0018] 2. Sand and gravel move from the center to the edge of the screening plate under the action of centrifugal force. During the movement, larger particles of sand and gravel have a larger mass, so they are subjected to stronger centrifugal force during rotation and tend to move to the outside of the screening plate, while smaller particles of sand and gravel are subjected to weaker centrifugal force and tend to move closer to the center of the screening plate. Therefore, smaller particles of sand and gravel are output from the first screening port, medium particles of sand and gravel are output from the second screening port, and larger particles of sand and gravel are output from the third screening port, thereby realizing multi-stage screening processing of sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention when clay sand is not pushed; Figure 4 This is a schematic diagram of the structure of the present invention when pushing clay sand; Figure 5 It is a schematic diagram of the structure of the fixed body, the multiple sieve plates and the screening plate; Figure 6 for Figure 5 The enlarged view of point A in the middle; In the figure: 1, machine body; 11, feed chamber; 12, rotating rod; 13, push plate; 14, feed port; 15, ramp ring; 2. Screening device; 21. Screening chamber; 22. Fixed body; 23. Multiple screening chambers; 24. Vibrating ring; 25. Guide block; 26. Pushing chamber; 27. Moving block; 28. Clay trough; 281. Filter plate; 29. Screening channel; 30. Connecting port; 31. Catcher; 32. Screening plate; 33. Protrusion; 34. First screening port; 35. Second screening port; 36. Third screening port. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] Example: Figure 1-Figure 6 As shown, the present invention provides a technical solution of a screening device for clay sand processing with a multi-stage screening function, comprising a body 1, a feed chamber 11 is arranged on the top of the body 1, a sub-screening device 2 is arranged at the bottom of the feed chamber 11, the sub-screening device 2 comprises a sub-screening chamber 21, the sub-screening chamber 21 is arranged inside the body 1, the feed chamber 11 is communicated with the sub-screening chamber 21, a fixed body 22 is arranged in the sub-screening chamber 21, a plurality of screen chambers 23 are arranged in the fixed body 22, and the plurality of screen chambers 23 are communicated with the sub-screening chamber 21.
[0022] As a specific embodiment of the present invention, a rotating rod 12 is arranged in the feed chamber 11, and a plurality of push plates 13 are arranged on the shaft arm of the rotating rod 12, and the plurality of push plates 13 are arranged around the axis of the rotating rod 12. A driving motor is arranged at the bottom of the feed chamber 11, and the driving shaft of the driving motor is connected to the rotating rod 12; a plurality of feed ports 14 are arranged on the side of the feed chamber 11 close to the sub-screening chamber 21, and a ramp ring 15 is arranged on the side of the feed port 14 close to the sub-screening chamber 21.
[0023] As a specific embodiment of the present invention, a vibration ring 24 is arranged in the screening chamber 21, and the vibration ring 24 is arranged outside the fixed body 22. The top of the vibration ring 24 is inclined toward the side close to the feed chamber 11, and the top of the vibration ring 24 is provided with a groove.
[0024] As a specific embodiment of the present invention, a plurality of guide blocks 25 are arranged on the top of the vibration ring 24, and the plurality of guide blocks 25 are arranged around the axis of the vibration ring 24. A pushing cavity 26 is arranged between two adjacent guide blocks 25, and a moving block 27 is arranged in the pushing cavity 26. The moving block 27 is slidably connected to the pushing cavity 26. A pneumatic cylinder is arranged in the pushing cavity 26, and a pushing rod of the pneumatic cylinder is connected to the moving block 27. A gas tank is arranged on the outside of the body 1, and the gas tank is connected to the pneumatic cylinder through a pipeline. A vibrator is arranged in the moving block 27, and both sides of the guide block 25 are inclined toward the moving block 27. The height of the guide block 25 is higher than the height of the top of the pushing cavity 26.
[0025] As a specific embodiment of the present invention, a clay groove 28 is provided between the fixed body 22 and the vibration ring 24 , a filter plate 281 is provided in the clay groove 28 , and a screening channel 29 is provided on a side of the filter plate 281 away from the clay groove 28 .
[0026] As a specific embodiment of the present invention, a plurality of connection ports 30 are provided in the middle of the fixed body 22, and a plurality of catchers 31 are provided on the side of the fixed body 22 close to the vibration ring 24. The plurality of catchers 31 are arranged around the axis of the fixed body 22, and the catchers 31 are arranged at an angle to the fixed body 22.
[0027] As a specific embodiment of the present invention, the middle diameter of the multi-sieve chamber 23 is smaller than the diameters at both ends of the multi-sieve chamber 23, a screening plate 32 is provided at the bottom of the multi-sieve chamber 23, and a protrusion 33 is provided at the center of the screening plate 32; a No. 1 motor is provided inside the sub-screening channel 29, a driving gear is provided on the driving shaft of the No. 1 motor, a main gear is provided on the outer wall of the screening plate 32 close to the sub-screening channel 29, the driving gear is meshed with the main gear, and the fixed body 22 is rotatably connected to the filter plate 281.
[0028] As a specific embodiment of the present invention, the screening plate 32 is provided with a first screening port 34, a second screening port 35 and a third screening port 36 in sequence from the center to the edge. The caliber of the first screening port 34 is smaller than the caliber of the second screening port 35, and the caliber of the second screening port 35 is smaller than the caliber of the third screening port 36.
[0029] Working principle of the present invention: Before the clay sand is poured into the feed chamber 11, the controller controls the drive motor to start, and the drive shaft of the drive motor drives the rotating rod 12 to rotate, and the rotating rod 12 drives the push plate 13 to rotate when rotating. After the clay sand is poured into the feed chamber 11, the clay sand moves to the side close to the feed port 14 under the rotation of the push plate 13, so that the clay sand moves from the feed chamber 11 to the surface of the ramp ring 15. Since the ramp ring 15 extends toward the vibration ring 24, the clay sand slides along the ramp ring 15 toward the side close to the vibration ring 24, and finally the clay sand falls off the ramp ring 15 and falls into the groove on the vibration ring 24. Before the clay sand falls from the chute ring 15 onto the vibration ring 24, the controller controls the vibrator on the moving block 27 to start. After the vibrator is started, vibration is generated. The vibration generates power on the moving block 27, so that materials of different particle sizes move relative to each other. Under the action of vibration, larger particles (sand and gravel) will be subjected to greater acceleration, and the sand and gravel will move to the side away from the moving block 27. However, smaller particles (clay) may keep the moving block 27 close to the vibration ring 24 due to their smaller mass and smaller inertia, that is, the sand and gravel will move to the surface of the clay, thereby forming a particle stratification effect. If the clay sand falls on the guide block 25, since both sides of the guide block 25 are inclined toward the moving block 27, and the height of the guide block 25 is higher than the height of the top of the pushing chamber 26, and the vibration generated by the vibrator will be transmitted to the guide block 25, the clay sand on the guide block 25 will be transported from the guide block 25 to the side close to the moving block 27, and then the clay sand will eventually gather in the groove of the moving block 27, and realize particle stratification under the action of vibration, so as to achieve the effect of separating sand and clay; In the process of the vibrator performing particle stratification on the clay sand on the surface of the moving block 27, the gas tank outside the body 1 delivers gas to the pneumatic cylinder in the pushing chamber 26 through a pipeline. When the gas pressure in the pneumatic cylinder reaches the set value, the pneumatic cylinder pushes the push rod to move, and the push rod moves the moving block 27 to the side away from the pushing chamber 26, thereby driving the clay sand on the surface to move during the movement of the moving block 27. The clay sand is separated from the surface of the moving block 27 under the action of the thrust. Since the mass of the sand and gravel on the surface of the clay is large, the greater the thrust effect it receives, the sand and gravel pass over the catcher 31 and move to the bottom of the ramp ring 15. Since the clay has a small mass, it is less affected by the thrust. Therefore, after the clay leaves the surface of the moving block 27, it is affected by gravity and moves to the side close to the clay groove 28. Then, it is transported to the sub-screening channel 29 through the filter plate 281, and finally output through the sub-screening channel 29. The sand and gravel flying to the bottom of the chute ring 15 falls after encountering an obstruction. Since the diameter of the sand and gravel is greater than the distance between two adjacent catchers 31, the sand and gravel falls on the surface of the catcher 31. Since the catcher 31 and the fixed body 22 are arranged at an angle, the sand and gravel are caught by the catcher 31 and move to the side close to the connecting port 30, and then the sand and gravel enter the multi-sieve chamber 23 through the connecting port 30. The middle diameter of the multi-sieve cavity 23 is smaller than the diameters of the two ends of the multi-sieve cavity 23, so that after entering the multi-sieve cavity 23, the sand and gravel are affected by the inner wall of the multi-sieve cavity 23, and then the sand and gravel in the multi-sieve cavity 23 moves from the edge to the center of the multi-sieve cavity 23, and finally falls downward from the center of the multi-sieve cavity 23, so that the sand and gravel falls on the protrusion 33; Before the sand and gravel enter the multi-screen chamber 23, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the driving gear to rotate. When the driving gear rotates, it drives the main gear to mesh and transmit, thereby rotating the screening plate 32. When the screening plate 32 rotates, centrifugal force is generated. Since the sand and gravel fall on the protrusion 33 first, and the screening plate 32 is provided with the first screening port 34, the second screening port 35 and the third screening port 36 from the center to the edge, the sand and gravel move from the center to the edge of the screening plate 32 under the action of centrifugal force. In the process of moving, the quality of the sand and gravel with larger particles is reduced. The smaller the particles, the stronger the centrifugal force they are subjected to during the rotation and tend to move toward the outside of the screening plate 32, while the smaller particles of sand and gravel are subjected to a weaker centrifugal force and tend to move toward the center of the screening plate 32. Therefore, the smaller particles of sand and gravel are output from the first screening port 34, the medium particles of sand and gravel are output from the second screening port 35, and the larger particles of sand and gravel are output from the third screening port 36, thereby realizing multi-stage screening processing of sand and gravel, thereby screening and separating sand and gravel of different sizes, and realizing the separation of sand and gravel particle sizes through the interaction between centrifugal force and particle quality differences.
[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
Claims
1. A screening device for clay sand processing with multi-stage screening function, characterized in that: The invention comprises a machine body (1), wherein a feed chamber (11) is arranged at the top of the machine body (1), a screening device (2) is arranged at the bottom of the feed chamber (11), the screening device (2) comprises a screening chamber (21), the screening chamber (21) is arranged inside the machine body (1), the feed chamber (11) is communicated with the screening chamber (21), a fixed body (22) is arranged inside the screening chamber (21), a plurality of screening chambers (23) are arranged inside the fixed body (22), and the plurality of screening chambers (23) are communicated with the screening chamber (21).
2. The screening device for clay sand processing with multi-stage screening function according to claim 1, characterized in that: A rotating rod (12) is arranged in the feeding chamber (11), and a plurality of push plates (13) are arranged on the shaft arm of the rotating rod (12). The plurality of push plates (13) are arranged around the axis of the rotating rod (12). A driving motor is arranged at the bottom of the feeding chamber (11), and a driving shaft of the driving motor is connected to the rotating rod (12).
3. The screening device for clay sand processing with multi-stage screening function according to claim 2, characterized in that: A plurality of feed ports (14) are arranged on one side of the feed chamber (11) close to the sub-screen chamber (21), and a ramp ring (15) is arranged on one side of the feed port (14) close to the sub-screen chamber (21).
4. The screening device for clay sand processing with multi-stage screening function according to claim 1, characterized in that: A vibration ring (24) is arranged in the screening chamber (21); the vibration ring (24) is arranged outside the fixed body (22); the top of the vibration ring (24) is inclined toward a side close to the feed chamber (11); and a groove is arranged at the top of the vibration ring (24).
5. The screening device for clay sand processing with multi-stage screening function according to claim 4, characterized in that: A plurality of guide blocks (25) are arranged at the top of the vibration ring (24), and the plurality of guide blocks (25) are arranged around the axis of the vibration ring (24). A pushing cavity (26) is arranged between two adjacent guide blocks (25). A moving block (27) is arranged in the pushing cavity (26). The moving block (27) is slidably connected to the pushing cavity (26). A pneumatic cylinder is arranged in the pushing cavity (26), and a pushing rod of the pneumatic cylinder is connected to the moving block (27). An air tank is arranged outside the machine body (1), and the air tank is connected to the air tank through a pipeline. A vibrator is arranged in the moving block (27). Both sides of the guide block (25) are inclined toward the moving block (27), and the height of the guide block (25) is higher than the height of the top of the pushing cavity (26).
6. The screening device for clay sand processing with multi-stage screening function according to claim 1, characterized in that: A clay groove (28) is provided between the fixed body (22) and the vibration ring (24), a filter plate (281) is provided in the clay groove (28), and a screening channel (29) is provided on a side of the filter plate (281) away from the clay groove (28).
7. The screening device for clay sand processing with multi-stage screening function according to claim 1, characterized in that: A plurality of connection ports (30) are provided in the middle of the fixed body (22), and a plurality of catchers (31) are provided on a side of the fixed body (22) close to the vibration ring (24). The plurality of catchers (31) are arranged around the axis of the fixed body (22), and the catchers (31) and the fixed body (22) are arranged at an angle.
8. The screening device for clay sand processing with multi-stage screening function according to claim 6, characterized in that: The diameter of the middle of the multi-sieve cavity (23) is smaller than the diameters at both ends of the multi-sieve cavity (23). A screening plate (32) is provided at the bottom of the multi-sieve cavity (23), and a protrusion (33) is provided at the center of the screening plate (32).
9. The screening device for clay sand processing with multi-stage screening function according to claim 8, characterized in that: A No. 1 motor is arranged inside the sub-screening channel (29), a driving gear is arranged on the driving shaft of the No. 1 motor, a main gear is arranged on the outer wall of the screening plate (32) close to the sub-screening channel (29), the driving gear is meshed with the main gear, and the fixed body (22) is rotatably connected to the filter plate (281).
10. The screening device for clay sand processing with multi-stage screening function according to claim 8, characterized in that: The screening plate (32) is provided with a first screening port (34), a second screening port (35) and a third screening port (36) in sequence from the center to the edge. The caliber of the first screening port (34) is smaller than that of the second screening port (35), and the caliber of the second screening port (35) is smaller than that of the third screening port (36).