Sand screening device capable of adjusting screening granularity
By introducing an adjustable screening particle size design into the sand screening device, and by using transverse and longitudinal screen bars to adjust the screen hole size and internal diversion inclined plate guidance, the problem of complex screen replacement is solved, and efficient and safe sand screening operation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 济南市长清区工程质量与安全中心
- Filing Date
- 2024-01-04
- Publication Date
- 2026-04-17
AI Technical Summary
Existing sand screening devices require screen replacement when screening different particle sizes, which is complicated and dangerous, and the screens are difficult to disassemble, affecting work efficiency.
The sand screening device adopts an adjustable particle size screening device. The size of the sand screening holes is adjusted by moving the horizontal and vertical screen bars. Combined with the design of the internal diversion inclined plate and buffer spring, the screening particle size can be flexibly adjusted, avoiding the need to disassemble the screen.
It enables flexible adjustment of screening particle size, improves sand screening efficiency and safety, reduces the workload of screen replacement, and enhances the compactness and accuracy of the equipment.
Smart Images
Figure CN121869699A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of sand screening equipment technology, and in particular to a sand screening device with adjustable screening particle size. Background Technology
[0002] In the production of sand and gravel, in order to increase the added value of sand and gravel, the sand and gravel are screened by a sand screening device. Large sand and gravel particles are used in concrete such as road surfaces, or large sand and gravel particles are crushed into smaller sand particles by a crusher. Fine sand used in interior decoration and exterior decoration has a higher price.
[0003] The sand screening device uses a screen to separate sand and gravel. Larger sand and gravel cannot pass through the screen mesh, while smaller sand and gravel can. However, if different sizes of sand and gravel need to be screened, the screen needs to be replaced. The screen is fixed with multiple sets of bolts, and the space between the screens is relatively narrow, resulting in limited working space for personnel to disassemble it, making the disassembly work difficult. In addition, the sand screening device is quite tall, requiring personnel to disassemble it at a height. The disassembly and replacement of the screen also requires equipment to lift and hoist it, further extending the time required for screen disassembly and replacement. Summary of the Invention
[0004] This disclosure relates to a sand screening device with adjustable screening particle size. After the transverse and longitudinal screen bars move to the middle of the sand screening through hole, the transverse and longitudinal screen bars divide the sand screening through hole into four parts, reducing the screening size of the sand screening through hole and adjusting the screening particle size to adapt to smaller particle size requirements, thus eliminating the burden of disassembling and replacing the middle screen frame.
[0005] In a first aspect, this disclosure provides a sand screening device with adjustable particle size, specifically comprising: a sand screening vibrating box, a middle screen frame, an inner diversion inclined plate, and a sand feed box. The middle screen frame is fixed inside the sand screening vibrating box, the inner diversion inclined plate is arranged above the middle screen frame, the sand feed box is arranged above the sand screening vibrating box, a vibration motor is fixed on the outer side of the middle part of the sand screening vibrating box, and side buffer blocks are fixed on both sides of the sand screening vibrating box. The lower part of the side buffer blocks is fixedly connected to the lower fixed frame.
[0006] In at least some embodiments, the middle screen frame has sand screening holes arranged in a spaced array, and side connecting slides are provided on all four sides of the outer side of the middle screen frame. The side connecting slides are fixed in the middle of the inner side of the sand screening vibration box. A transverse screen bar is provided at the bottom of the middle screen frame, and a longitudinal screen bar is provided below the transverse screen bar. Both ends of the transverse screen bar and the longitudinal screen bar are fixed with an outer connecting slide frame, and the outer connecting slide frame is screwed to the displacement screw.
[0007] In at least some embodiments, the displacement screw and the side connecting slide are rotatably connected, both ends of the displacement screw are provided with bevel teeth to mesh with another displacement screw, the side connecting slide and the outer connecting slide are slidably connected, and the four displacement screws form a quadrilateral structure, with the four displacement screws forming a group of two.
[0008] In at least some embodiments, the sand screening holes are arranged in a horizontal and vertical array. Each horizontal row of sand screening holes has a horizontal screen bar at its bottom, and each vertical row of sand screening holes has a vertical screen bar at its bottom. The horizontal and vertical screen bars are arranged perpendicularly and intersecting each other. The size of the sand and gravel that can pass through the sand screening holes is adjusted by the range of movement of the horizontal and vertical screen bars.
[0009] In at least some embodiments, the outer connecting slide frames at both ends of the longitudinal screen bar and the side connecting slide frames at the front and rear of the middle screen frame are slidably connected, and the outer connecting slide frames at both ends of the transverse screen bar and the side connecting slide frames on the left and right sides of the middle screen frame are slidably connected. The transverse screen bar and the longitudinal screen bar block the through path of the sand screening hole. The obstruction by the transverse screen bar and the longitudinal screen bar reduces the size of the sand and gravel passing through the sand screening hole, and reduces the size of the sand passing through the sand screening hole.
[0010] In at least some embodiments, a buffer spring is fixed to the tail of the inner diversion inclined plate. The lower end of the buffer spring is fixed to the side connecting frame. A middle lifting screw is screwed to the middle of the side connecting frame. The lower end of the middle lifting screw is rotatably connected to the side connecting slide. The gap between the inner diversion inclined plate and the middle screen frame is large enough to allow small gravel to pass through. The inner diversion inclined plate also blocks the gravel in the upper layer, preventing the upper gravel from being unable to be screened. At the same time, the inner diversion inclined plate guides the upper gravel to both sides, evenly guiding the gravel to both sides of the middle screen frame.
[0011] In at least some embodiments, the tail end of the inner diversion inclined plate and the side connecting frame are vertically slidably connected, the side connecting frame and the side connecting slide are vertically slidably connected, the inner diversion inclined plate is above the middle screen frame, the inner diversion inclined plate and the middle screen frame are spaced apart, and inner diversion inclined plates are provided on both sides of the middle screen frame. The inner diversion inclined plates are staggered to form an S-shaped channel. The S-shaped combination of inner diversion inclined plates guides the gravel to make an S-shaped path, extending the movement path of the gravel.
[0012] In at least some embodiments, an inner uniform material spiral shaft is rotatably provided inside the sand feed box. The sand feed box and the top of the lower fixed frame are fixedly connected. The tail end of the inner uniform material spiral shaft is fixed to the main shaft of the drive motor. The drive motor is fixed on the outside of the sand feed box. The spiral teeth on the outside of the inner uniform material spiral shaft push the central sand and gravel to move evenly to both sides.
[0013] This invention provides a sand screening device with adjustable particle size, which has the following beneficial effects:
[0014] After the transverse and longitudinal screen bars move to the middle of the sand screening hole, they divide the sand screening hole into four parts, reducing the screening size of the sand screening hole and adjusting the particle size to meet smaller particle size requirements, thus eliminating the burden of disassembling and replacing the middle screen frame.
[0015] The internal diversion inclined plate guides the sand and gravel in an S-shaped path, extending the screening time, reducing the adhesion of large sand and gravel to small sand and gravel, and improving the accuracy of sand screening.
[0016] The gap between the inner diversion inclined plate and the middle screen frame allows small gravel at the bottom to pass through. At the same time, the inner diversion inclined plate guides the upper gravel to both sides, evenly directing the gravel to both sides of the middle screen frame. The middle screen frame performs sand screening more evenly, which can further improve sand screening efficiency compared to screening sand in the middle of the middle screen frame.
[0017] The inner diversion inclined plate vibrates upwards via a buffer spring, preventing sand and gravel from blocking the inner diversion inclined plate and the middle screen frame, thus ensuring that the channel between the inner diversion inclined plate and the middle screen frame remains unobstructed. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.
[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.
[0020] In the attached diagram:
[0021] Figure 1 A schematic diagram of the overall structure of this application is shown;
[0022] Figure 2 A schematic diagram of the screen frame structure of this application is shown;
[0023] Figure 3 A schematic diagram of the side-tilt structure of the screen frame in this application is shown;
[0024] Figure 4 A schematic diagram of the displacement screw structure of this application is shown;
[0025] Figure 5 This application shows Figure 4 A magnified structural diagram of point A in the middle;
[0026] Figure 6 This diagram illustrates the structure of the transverse and longitudinal screen bars of this application, with the bars positioned in the middle of the sand screening holes.
[0027] Figure 7 This invention provides a schematic diagram of the structure of the screen frame and the transverse and longitudinal screen bars after disassembly.
[0028] Figure 8 A schematic diagram of the internal flow divider of this application is shown;
[0029] Figure 9 A schematic diagram of the buffer spring of this application is shown;
[0030] Figure 10 This application shows Figure 9 A magnified structural diagram of point B in the middle;
[0031] List of reference numerals
[0032] 1. Sand screening vibrating box; 101. Vibrating motor; 102. Side buffer block; 103. Lower fixed frame;
[0033] 2. Middle screen frame; 201. Sand screening through hole; 202. Side connecting slide; 203. Transverse screen bar; 204. Longitudinal screen bar; 205. External connecting slide frame; 206. Displacement screw;
[0034] 3. Inner diversion ramp; 301. Buffer spring; 302. Side connecting frame; 303. Central lifting screw;
[0035] 4. Sand feed box; 401. Internal material equalization screw shaft; 402. Drive motor. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] Example 1: Please refer to Figures 1 to 10 :
[0038] This invention proposes a sand screening device with adjustable particle size, comprising: a sand screening vibrating box 1, a middle screen frame 2, an inner diversion inclined plate 3, and a sand feed box 4. A vibration motor 101 is fixed to the outer side of the middle part of the sand screening vibrating box 1. Side buffer blocks 102 are fixed on both sides of the sand screening vibrating box 1. The side buffer blocks 102 are made of rubber or have a helical spring structure. The side buffer blocks 102 buffer and isolate the vibration transmission of the vibration motor 101 and the sand screening vibrating box 1 to the lower fixed frame 103. The lower part of the side buffer block 102 and the lower... The lower fixed frame 103 is directly fixed to the ground. A middle screen frame 2 is fixed inside the sand screening vibrating box 1. The middle screen frame 2 has sand screening holes 201 arranged in a spaced array. Side connecting slides 202 are provided on all four sides of the outer side of the middle screen frame 2. The side connecting slides 202 are fixed to the middle of the inner side of the sand screening vibrating box 1. A transverse screen bar 203 is provided at the bottom of the middle screen frame 2. A longitudinal screen bar 204 is provided below the transverse screen bar 203. The two ends of the transverse screen bar 203 and the longitudinal screen bar 204 are connected. Each is fixed with an external connecting slide frame 205, which is screwed to a displacement screw 206. The displacement screw 206 is rotatably connected to a side connecting slide 202. Both ends of the displacement screw 206 are provided with bevel teeth that mesh with another displacement screw 206. The side connecting slide 202 is provided with an L-shaped slide groove frame that is slidably connected to the external connecting slide frame 205. The four displacement screws 206 form a quadrilateral structure, and the four displacement screws 206 are paired up to lift the transverse screen bar 203 and the longitudinal screen bar 204. To reduce the deformation caused by the strength of 04, the sand screening holes 201 are arranged in a horizontal and vertical array. Each horizontal row of sand screening holes 201 has a horizontal screen bar 203 at its bottom, and each vertical row of sand screening holes 201 has a vertical screen bar 204 at its bottom. The horizontal screen bars 203 and the vertical screen bars 204 are arranged perpendicularly. The size of the sand screening holes 201 is adjusted by the range of movement of the horizontal screen bars 203 and the vertical screen bars 204, so that the sand screening holes 201 can pass through the largest size of sand and gravel.
[0039] An inner diversion inclined plate 3 is installed above the middle screen frame 2. A buffer spring 301 is fixed to the tail of the inner diversion inclined plate 3. The lower end of the buffer spring 301 is fixed to the side connecting frame 302. A central lifting screw 303 is screwed to the middle of the side connecting frame 302. The lower end of the central lifting screw 303 is rotatably connected to the side connecting slide 202. The gap between the inner diversion inclined plate 3 and the middle screen frame 2 is large enough to allow small gravel from the bottom layer to pass through. The inner diversion inclined plate 3 simultaneously blocks the gravel from the upper layer, preventing the upper gravel from being unable to be screened. At the same time, the inner diversion inclined plate 3 guides the upper gravel to both sides, evenly guiding the gravel to both sides of the middle screen frame 2. The top of frame 2 is evenly covered with gravel, allowing the middle screen frame 2 to perform sand screening more evenly. A sand feed box 4 is set above the sand screening vibrating box 1. An inner uniform material spiral shaft 401 is rotatably installed inside the sand feed box 4. The outer side of the inner uniform material spiral shaft 401 is equipped with spiral teeth. The top of the sand feed box 4 and the lower fixed frame 103 are fixedly connected. The tail end of the inner uniform material spiral shaft 401 is fixed to the main shaft of the drive motor 402. The drive motor 402 is fixed on the outer side of the sand feed box 4. The spiral teeth on the outer side of the inner uniform material spiral shaft 401 push the middle gravel to move evenly to both sides, ensuring that the bottom of the sand feed box 4 discharges material evenly from the middle screen frame 2.
[0040] In this embodiment, the outer connecting slide frames 205 at both ends of the longitudinal screen bar 204 and the side connecting slide frames 202 at the front and rear of the middle screen frame 2 are slidably connected. The outer connecting slide frames 205 at both ends of the transverse screen bar 203 and the side connecting slide frames 202 on the left and right sides of the middle screen frame 2 are slidably connected. The transverse screen bar 203 and the longitudinal screen bar 204 block the through path of the sand screening hole 201. The transverse screen bar 203 moves longitudinally, and the longitudinal screen bar 204 moves transversely. The obstruction by the transverse screen bar 203 and the longitudinal screen bar 204 reduces the size of the sand passing through the sand screening hole 201, reduces the size of the sand passing through the sand screening hole 201, and adjusts the particle size of the screening to adapt to smaller particle size requirements.
[0041] In this embodiment, the tail of the inner diversion inclined plate 3 and the side connecting frame 302 are vertically slidably connected, and the side connecting frame 302 and the side connecting slide 202 are vertically slidably connected. The inner diversion inclined plate 3 is located above the middle screen frame 2. The inner diversion inclined plate 3 and the middle screen frame 2 are spaced apart. Both sides of the middle screen frame 2 are provided with inner diversion inclined plates 3. The inner diversion inclined plates 3 are staggered to form an S-shaped channel. The S-shaped combination of inner diversion inclined plates 3 guides the sand and gravel to make an S-shaped path, prolongs the movement path of the sand and gravel, prolongs the screening time of the sand and gravel, increases the contact time between the sand and gravel and the middle screen frame 2, and can shake off all the large sand and gravel that stick to the small sand and gravel, reducing the situation of large sand and gravel sticking to small sand and gravel.
[0042] In Example 2, based on Example 1, the transverse screen bar 203 and the longitudinal screen bar 204 can be an integrated structure. The outer connecting slide frame 205 and the side connecting slide 202 around the transverse screen bar 203 and the longitudinal screen bar 204 are inclined at 45 degrees in the horizontal direction. The displacement screw 206 is also inclined at 45 degrees in the horizontal direction. The external thread of the displacement screw 206 guides the outer connecting slide frame 205 to move along the 45-degree diagonal of the middle screen frame 2. When the transverse screen bar 203 and the longitudinal screen bar 204 move below the sand screening hole 201, the passing size of the sand screening hole 201 is reduced to meet the requirements of particle size adjustment. After the transverse screen bar 203 and the longitudinal screen bar 204 are integrated, the overall thickness is reduced and the number of parts is reduced.
[0043] The working principle of this embodiment: The funnel-shaped sand feed box 4 serves as the inlet for sand and gravel. Sand and gravel are fed into the top of the sand feed box 4, and discharged into the middle screen frame 2 from the bottom. The drive motor 402 starts and drives the inner uniform material spiral shaft 401 to rotate. The spiral teeth on the outside of the inner uniform material spiral shaft 401 push the middle sand and gravel to move axially, and push the middle sand and gravel to move evenly on both sides, ensuring the uniformity of the sand and gravel in the middle and on both sides, and ensuring that the bottom of the sand feed box 4 discharges evenly from the middle screen frame 2. The vibration motor 101 drives the sand screening vibration box 1 and the middle screen frame 2. The screen frame 2 vibrates together, and small sand and gravel pass through the sand screening holes 201 to the bottom, while large sand and gravel cannot pass through the sand screening holes 201 and flow at the top of the middle screen frame 2, realizing the screening operation of sand particles of different sizes. The S-shaped combination of the inner diversion inclined plate 3 guides the sand and gravel to make an S-shaped path, extending the movement path of the sand and gravel, extending the screening time of the sand and gravel, and increasing the contact time between the sand and gravel and the middle screen frame 2. Large sand and gravel sticking to small sand and gravel can also be shaken off completely, reducing the situation of large sand and gravel sticking to small sand and gravel, improving the accuracy of sand screening, without increasing the length of the middle screen frame 2, improving the compactness of the equipment;
[0044] When particle size adjustment is required, the displacement screw 206 rotates. The external thread of the displacement screw 206 drives the external connecting slide frame 205 to move. The four displacement screws 206 form a quadrilateral structure, and the four displacement screws 206 are paired up to increase the strength of the transverse screen bar 203 and the longitudinal screen bar 204 and reduce movement deformation. The displacement screws 206 rotate synchronously through bevel gears. When one displacement screw 206 rotates, the other three displacement screws 206 rotate synchronously. The outer connecting slide frames 205 of the screen bars 204 move axially synchronously along the displacement screw 206. The transverse screen bar 203 moves longitudinally, and the longitudinal screen bar 204 moves transversely. The transverse screen bar 203, the longitudinal screen bar 204, and the middle screen frame 2 maintain a sliding fit to reduce the gap. The transverse screen bar 203 and the longitudinal screen bar 204 move towards the inside of the sand screening hole 201. After the transverse screen bar 203 and the longitudinal screen bar 204 move to the middle of the sand screening hole 201, they block the screen. The sand-screening hole 201 is divided into four parts by the transverse screen bar 203 and the longitudinal screen bar 204. The obstruction of the transverse screen bar 203 and the longitudinal screen bar 204 reduces the size of the sand passing through the sand-screening hole 201, thus reducing the screen size and adjusting the particle size to meet smaller particle size requirements. This eliminates the burden of disassembling and replacing the middle screen frame 2. The transverse screen bar 203 and the longitudinal screen bar 204 adjust the size of the sand passing through the sand-screening hole 201 by moving their positions. When the screen bar 204 is in the middle of the sand screening hole 201, it is the smallest particle size. When the transverse screen bar 203 and the longitudinal screen bar 204 move to the bottom of the middle screen frame 2 between the sand screening holes 201, the transverse screen bar 203 and the longitudinal screen bar 204 will not block the sand screening hole 201, eliminating the troublesome disassembly operation of the middle screen frame 2, and also eliminating the need for personnel to disassemble the middle screen frame 2 at a high position, eliminating the need for lifting and hoisting, shortening the speed of screening and adjusting different sand particles, and adjusting the screening size of different sand particles more quickly;
[0045] The inner diversion inclined plate 3 and the middle screen frame 2 are spaced apart, with the spacing allowing small gravel at the bottom to pass through. The inner diversion inclined plate 3 simultaneously blocks the upper gravel, preventing it from being unable to be screened. Simultaneously, the inner diversion inclined plate 3 guides the upper gravel to both sides, evenly directing it to both sides of the middle screen frame 2. The top of the middle screen frame 2 is evenly covered with gravel, allowing for more uniform sand screening. This results in more even wear and tear on the middle screen frame 2, avoiding the situation where the middle section wears more severely than the sides due to prolonged screening, leading to uneven use and a shortened lifespan. Compared to screening primarily in the middle, this method further improves screening efficiency. (The text also mentions a middle lifting screw, but this seems unrelated to the main topic and is likely a separate, incomplete sentence.) When rod 303 rotates, the threaded guide side connecting frame 302 of the middle lifting screw 303 moves vertically. The side connecting frame 302 and the inner diversion inclined plate 3 move vertically synchronously. The vertical movement of the inner diversion inclined plate 3 adjusts the distance between it and the middle screen frame 2, thereby adjusting the amount of gravel passing between the inner diversion inclined plate 3 and the middle screen frame 2. The distance between the inner diversion inclined plate 3 and the middle screen frame 2 is adjusted according to the size of the gravel raw material. The inner diversion inclined plate 3 moves upward and vibrates through the buffer spring 301 to expand the distance between it and the middle screen frame 2. The buffer spring 301 pulls the inner diversion inclined plate 3 to move downward and reset after moving upward. The up and down movement of the inner diversion inclined plate 3 avoids the situation where the inner diversion inclined plate 3 and the middle screen frame 2 are blocked by gravel, ensuring that the channel between the inner diversion inclined plate 3 and the middle screen frame 2 remains unobstructed.
[0046] The following points should be noted in this article:
[0047] 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.
[0048] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.
[0049] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A sand screening device with adjustable screening particle size, comprising: The sand screening vibrating box (1), the middle screen frame (2), the inner diversion inclined plate (3) and the sand feed box (4) are characterized in that the middle screen frame (2) is fixed inside the sand screening vibrating box (1), the inner diversion inclined plate (3) is provided above the middle screen frame (2), the sand feed box (4) is provided above the sand screening vibrating box (1), the middle screen frame (2) has sand screening through holes (201) arranged at intervals, the outer side of the middle screen frame (2) is provided with side connecting slides (202), the bottom of the middle screen frame (2) is provided with transverse screen bars (203), the lower part of the transverse screen bars (203) is provided with longitudinal screen bars (204), the two ends of the transverse screen bars (203) and the longitudinal screen bars (204) are fixed with external connecting slide frames (205), and the external connecting slide frames (205) and displacement screws (206) are screwed together.
2. The sand screening device with adjustable particle size according to claim 1, characterized in that, A vibration motor (101) is fixed on the outer side of the middle part of the sand screening vibration box (1), and side buffer blocks (102) are fixed on both sides of the sand screening vibration box (1). The lower part of the side buffer block (102) is fixedly connected to the lower fixing frame (103).
3. The sand screening device with adjustable particle size according to claim 1, characterized in that, The displacement screw (206) and the side connecting slide (202) are rotatably connected, and the two ends of the displacement screw (206) are meshed with another displacement screw (206). The side connecting slide (202) and the outer connecting slide frame (205) are slidably connected.
4. A sand screening device with adjustable particle size according to claim 3, characterized in that, The sand screening holes (201) are arranged in a horizontal and vertical array. Each horizontal sand screening hole (201) has a horizontal screen bar (203) at its bottom, and each vertical sand screening hole (201) has a vertical screen bar (204) at its bottom. The horizontal screen bars (203) and the vertical screen bars (204) are arranged perpendicularly.
5. A sand screening device with adjustable particle size according to claim 4, characterized in that, The outer connecting slide frames (205) at both ends of the longitudinal screen bar (204) and the side connecting slide frames (202) at the front and rear of the middle screen frame (2) are slidably connected, and the outer connecting slide frames (205) at both ends of the transverse screen bar (203) and the side connecting slide frames (202) on the left and right sides of the middle screen frame (2) are slidably connected.
6. A sand screening device with adjustable particle size according to claim 1, characterized in that, The inner diversion ramp (3) is fixed with a buffer spring (301) at its tail. The lower end of the buffer spring (301) is fixed to the side connecting frame (302). The middle part of the side connecting frame (302) is screwed with a middle lifting screw (303). The lower end of the middle lifting screw (303) is rotatably connected to the side connecting slide (202).
7. A sand screening device with adjustable particle size according to claim 6, characterized in that, The tail of the inner diversion inclined plate (3) and the side connecting frame (302) are vertically slidably connected, and the side connecting frame (302) and the side connecting slide (202) are vertically slidably connected. The inner diversion inclined plate (3) is located above the middle screen frame (2). The inner diversion inclined plate (3) and the middle screen frame (2) are spaced apart. The inner diversion inclined plate (3) is provided on both sides of the middle screen frame (2). The inner diversion inclined plates (3) are staggered to form an S-shaped channel.
8. A sand screening device with adjustable particle size according to claim 1, characterized in that, The inner side of the sand feed box (4) is rotatably equipped with an inner uniform material spiral shaft (401). The tail end of the inner uniform material spiral shaft (401) is fixed to the main shaft of the drive motor (402), and the drive motor (402) is fixed to the outside of the sand feed box (4).