Screening device and method for screening quartz sand

Abstract

The present application provides a screening device and method for screening quartz sand, which belongs to the field of quartz sand processing technology, including a base and a screen box with an eccentric rotation connection on its top, a screen plate for screening quartz sand is provided in the inner cavity of the screen box, and a servo motor is provided on the base; a stepped shaft that can pass through the screen plate is rotatably connected at the center of the screen box, and the stepped shaft consists of a large-diameter shaft body at the top and a small-diameter shaft body at the bottom, the large-diameter shaft body is hollow and connected to a feed pipe provided through the top of the screen box in a rotationally connected manner, a spreading plate is provided at the connection between the large-diameter shaft body and the small-diameter shaft body in a rotationally sleeved manner through a torsion spring, a plurality of circumferentially arrayed drop holes are provided on the inner bottom of the inner cavity of the large-diameter shaft body and the spreading plate, and a driving member is provided inside the screen box; the present application can reduce the possibility that small particles of quartz sand are easily entrained by large particles of quartz sand and discharged from the screening area when too much quartz sand is accumulated on the sieve plate.

Description

Technical Field

[0001] The present application relates to the technical field of quartz sand processing, and in particular to a screening device and method for screening quartz sand. Background Art

[0002] Quartz sand is a fine-grained material made from high-purity silicon dioxide through a meticulous screening and purification process. Due to its excellent physical and chemical properties, quartz sand has a wide range of applications across multiple industries. Firstly, in the glass manufacturing industry, quartz sand serves as one of the primary raw materials, providing the basic framework for the production of various glass products, including flat glass, bottles and cans, and optical glass. Secondly, in the foundry industry, quartz sand is used as a high-quality sand mold material, offering excellent heat resistance and molding properties, enabling the production of high-precision metal parts. Furthermore, in the ceramics industry, it serves as a key raw material or aggregate, improving the hardness, heat resistance, and overall quality of ceramic products, making them more durable and aesthetically pleasing. In the filtration industry, quartz sand is widely used as a filter medium, effectively removing sediment, impurities, and other suspended matter from liquids, thereby enhancing their cleanliness and purity. The key advantages of quartz sand lie in its high hardness and strong wear resistance, which allows it to maintain its structural stability over time in various processing and use environments and is not easily damaged by friction or mechanical action. At the same time, it has excellent chemical stability and can remain unreactive and non-deteriorating in complex environments such as acid and alkali corrosion. These characteristics ensure the reliability and durability of quartz sand during screening and processing, providing a high-quality material foundation for industrial production.

[0003] During the production and processing of quartz sand, screening equipment is often used to screen the sand to ensure that its particle size meets the specific requirements of various industrial applications. Through efficient screening processes, quartz sand of different particle sizes can be separated in an orderly manner to obtain particles that meet product specifications, thereby significantly improving product quality and performance. At the same time, screening can effectively remove impurities from the quartz sand and particles that are too large or too small that do not meet specifications, ensuring its purity and particle size uniformity. This not only helps to improve product stability, consistency, and reliability, but also extends the service life of the screening equipment, reduces equipment maintenance costs, and reduces material waste during the production process. Therefore, the screening process is not only related to the final quality of the quartz sand, but also directly affects production efficiency and cost control. It is an indispensable and important link in achieving high-quality quartz sand production.

[0004] Reference is made to a Chinese patent document with the publication number CN116786412B, published on November 3, 2023, entitled "A Circular Swinging Screen," which comprises a base, a support base provided at the top of the base, a top cover provided above the support base, a feed port provided in the middle of the top cover, a screening module provided between the top cover and the support base, the screening module comprising a top screen, an intermediate screen, and a lower screen. The present invention increases the time for screening materials on the circular swinging screen by adding a guide ring to the interior of the circular swinging screen, and can screen the materials multiple times, effectively improving the screening effect and efficiency.

[0005] Referring to the above technical solution, when using a swing screen to screen quartz sand, in order to ensure screening efficiency, the quartz sand is usually transferred to the sieve plate in a continuous feeding manner. As the quartz sand is continuously fed, the quartz sand tends to accumulate on the sieve plate. In this state, the quartz sand accumulated on the upper layer may move to the edge of the sieve plate due to the vibration of the sieve plate or its own fluidity. Small quartz sand particles are easily entrained by large quartz sand particles and discharged from the screening area through the discharge port above the sieve plate. As a result, small quartz sand particles cannot be separated from large quartz sand particles, which in turn affects the final quality of the quartz sand screening work. Summary of the Invention

[0006] In view of this, the present application provides a screening device and method for screening quartz sand, which are mainly used to solve the problem that when quartz sand is excessively accumulated on the sieve plate, small particles of quartz sand are easily engulfed by large particles of quartz sand and discharged from the screening area through the discharge port above the sieve plate.

[0007] In order to solve the above technical problems, the present application provides a screening device and method for screening quartz sand.

[0008] The sieve of claim 1, wherein the sieve box is mounted on a support frame and has a cam portion for circumventing the sieve box's movement. The sieve box is mounted on a support frame, and the sieve box is mounted on a support frame. The sieve box is mounted on a support frame, and the support frame is mounted on a support frame.

[0009] Using this technical solution, during the quartz sand loading process, personnel first feed the sand into the inner cavity of the large-diameter shaft through the feed pipe. At this point, the dropout holes on the spreader align with those on the large-diameter shaft, allowing the sand to pass smoothly through the dropout holes and fall onto the sieve plate for screening. The spreader blades on the spreader act as a barrier during this stage, preventing large particles of sand from entraining smaller particles during discharge. Driven by the drive element, the small and large-diameter shafts rotate, and the spreader rotates accordingly, spreading the sand evenly across the sieve plate to prevent excessive accumulation that could affect screening efficiency. When the sieve plate accumulates heavily, the spreader plate experiences increased resistance, overcoming the torsion spring's elasticity and causing it to rotate slightly relative to the large-diameter shaft. This causes the dropout holes to misalign, slowing the loading rate. Once the accumulation decreases, the spreader automatically resets under the action of the spring, resuming the loading rate. This effectively prevents large particles from being discharged together with small particles, ensuring smooth and efficient screening.

[0010] Optionally, a plurality of combing plates distributed in a circumferential array are provided in the middle of the bottom surface of the spreading tray, and the combing plates and the blanking holes are spaced one by one in the circumferential direction, and each combing plate is provided with a plurality of slots for quartz sand to pass through.

[0011] By adopting the above technical solution, when quartz sand falls onto the sieve plate through the drop hole, the spreading plate will rotate together with the large-diameter shaft. During this process, the combing plate can perform preliminary stirring and combing of the quartz sand, which helps to break up the accumulated particles and promote the distribution of quartz sand on the sieve plate to be more even. It can not only reduce the possibility of local accumulation of quartz sand, but also improve the effect of quartz sand screening to a certain extent.

[0012] Optionally, an avoidance groove is provided at one end of the bottom surface of the spreading blade of the spreading tray close to the step axis, so as to provide a larger distribution space for the quartz sand in the loading state.

[0013] By adopting the above technical solution, in the process of quartz sand falling onto the sieve plate through the drop hole, the avoidance groove can provide a larger space and channel for the quartz sand in the loading state, which helps the quartz sand to quickly expand and disperse at the moment it falls on the sieve plate, thereby avoiding the accumulation of quartz sand or getting stuck between the spreading blades of the spreading plate and the contact surface of the sieve plate, reducing the risk of quartz sand blockage and accumulation, and ensuring that the quartz sand can flow smoothly into the screening area, thereby improving the continuity and efficiency of screening, which is conducive to improving the smoothness of the screening process and ensuring the normal progress of subsequent screening work.

[0014] Optionally, a conical block is provided at the center of the bottom of the inner cavity of the large-diameter shaft body, for guiding the quartz sand entering the inner cavity of the large-diameter shaft body toward a direction close to the blanking hole.

[0015] By adopting the above technical solution, when the quartz sand enters the inner cavity of the large-diameter shaft, the quartz sand can move along the inclination angle of the conical surface of the conical block in the direction away from the central axis of the large-diameter shaft, prompting the quartz sand to pass downward through the drop hole and enter the screening area, thereby reducing the risk of quartz sand being blocked inside the large-diameter shaft, and further ensuring the continuity and stability of the screening process.

[0016] Optionally, a sealing ring is provided at the connection between the large-diameter shaft and the material spreading tray to seal the gap between the large-diameter shaft and the material spreading tray.

[0017] By adopting the above technical solution, the sealing ring can block and seal the gap between the large diameter shaft and the material spreading plate, preventing quartz sand from entering the gap area between the large diameter shaft and the material spreading plate, ensuring that the relative rotation between the large diameter shaft and the material spreading plate is smoother, extending the service life of the equipment, and at the same time avoiding mechanical wear and failure caused by particle infiltration, ensuring the stability and efficiency of the screening process.

[0018] Optionally, the driving member includes a reduction motor arranged inside the screen box, and the output shaft of the reduction motor is connected to the small-diameter shaft through a belt drive.

[0019] Optionally, a plurality of rubber tension springs distributed in a circumferential array are provided between the bottom plate of the base and the outer surface of the screen box.

[0020] By adopting the above technical solution, when the screen box is performing screening operations, as the screen box swings and moves, multiple rubber tension springs will work in coordination to reduce the possibility of the screen box tipping over or excessive shaking, thereby enhancing the stability of the screening operation.

[0021] In a second aspect, the present application provides a screening method for screening quartz sand, which is applied to the screening device for screening quartz sand described in the first aspect, comprising:

[0022] S1, the servo motor drives the screen box and the sieve plate inside it to rotate eccentrically. At the same time, the personnel feeds quartz sand into the inner cavity of the large-diameter shaft through the feed pipe, and then the quartz sand falls on the sieve plate through the drop hole for screening;

[0023] S2, the driving member drives the small diameter shaft and the large diameter shaft to rotate together, so that the spreading plate rotates along with the large diameter shaft, and the quartz sand is spread on the sieve plate by the spreading plate, thereby reducing the accumulation thickness of the quartz sand on the sieve plate;

[0024] S3, under the screening action of the sieve plate, large particles of quartz sand can be discharged from the discharge port on the upper layer of the sieve plate, and small particles of quartz sand will be discharged from the discharge port on the lower layer of the sieve plate after passing through the sieve holes on the sieve plate.

[0025] By adopting this technical solution, a servo motor drives the eccentric rotation of the screen box and the internal sieve disc. Simultaneously, a person feeds quartz sand into the inner cavity of the large-diameter shaft through a feed pipe. The quartz sand falls through the drop holes and onto the sieve disc for screening. The drive element causes the small-diameter and large-diameter shafts to rotate synchronously, causing the spreading disc to rotate with the large-diameter shaft, evenly spreading the quartz sand on the sieve disc and reducing the accumulation thickness. After screening, large quartz sand particles are discharged from the upper discharge port, while small quartz sand particles pass through the sieve holes and are discharged from the lower discharge port, thus achieving particle classification and screening of the quartz sand.

[0026] Optionally, in S1, when the quartz sand moves toward the distal end of the sieve disc due to the eccentric rotation of the sieve disc, the spreading blades of the spreading disc can have a certain blocking effect on the quartz sand, forcing the quartz sand to move along the spreading blades of the spreading disc, thereby reducing the movement speed of the quartz sand on the sieve disc by extending the movement path, thereby reducing the probability of large particles of quartz sand being discharged together with small particles of quartz sand.

[0027] By adopting the above technical solution, the spreading blades of the spreading tray have a certain blocking effect on the quartz sand, forcing the quartz sand to move along the blades, thereby extending the movement path of the quartz sand, so as to reduce the movement speed of the quartz sand on the sieve tray, effectively reducing the probability of large particles of quartz sand being discharged together with small particles of quartz sand, and improving the grading effect and efficiency of screening.

[0028] Optionally, in S2, when a large amount of quartz sand accumulates on the sieve plate, the resistance encountered by the spreading plate when flattening the quartz sand will increase accordingly. At this time, the spreading plate will rotate relative to the large-diameter shaft, thereby causing the drop holes on the spreading plate and the drop holes on the large-diameter shaft to be misaligned, reducing the speed at which the quartz sand falls from the drop holes onto the sieve plate, thereby reducing the possibility of excessive accumulation of quartz sand on the sieve plate.

[0029] By adopting the above technical solution, the material spreading plate can rotate relative to the large-diameter shaft according to the amount of quartz sand accumulated on the sieve plate, thereby causing the drop holes on the material spreading plate and the drop holes on the large-diameter shaft to be misaligned, slowing down the speed at which the quartz sand falls from the drop holes onto the sieve plate, and reducing the probability of excessive accumulation of quartz sand on the sieve plate, so as to improve the stability and smoothness of subsequent screening work.

[0030] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0031] 1. During the screening process of quartz sand, the blocking and diversion method is used to prolong the residence time of quartz sand on the sieve plate, reduce the possibility of quartz sand moving quickly to the edge of the sieve plate, and evenly flatten the quartz sand accumulated on the sieve plate, which helps the quartz sand to pass through the sieve holes on the sieve plate evenly, avoiding the accumulation or blockage of quartz sand at local points on the sieve plate, thereby improving the smoothness of quartz sand screening and the final screening quality.

[0032] 2. When spreading the quartz sand on the sieve plate, the spreading plate can dynamically adjust the feeding rate of the quartz sand according to the amount of quartz sand accumulated on the sieve plate, which can further reduce the probability of excessive accumulation of quartz sand on the sieve plate, thereby reasonably controlling the supply rhythm of quartz sand and ensuring that the quartz sand is evenly distributed on the sieve plate. At the same time, it can avoid the possibility of excessive accumulation of quartz sand and bringing a heavy burden to the sieve plate, thereby extending the service life of the sieve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a screening device for screening quartz sand in the present application;

[0034] Figure 2 A cross-sectional view of the base and screen box for this application;

[0035] Figure 3 This is a front view of the base and screen box for this application;

[0036] Figure 4 This is an exploded view of the step shaft and material spreading tray of this application;

[0037] Figure 5 This is a schematic diagram of the structure of the torsion spring and the spreading tray of this application;

[0038] Figure 6 This is a bottom view of the large-diameter shaft and the blanking hole on the material spreading plate of the present application in an overlapping state;

[0039] Figure 7 This is a bottom view of the large-diameter shaft and the blanking holes on the material spreading plate of the present application in a misaligned state;

[0040] Figure 8 For this application Figure 3 A partial enlarged view of area A in the middle.

[0041] Explanation of the accompanying drawings: 1. Base; 11. Servo motor; 2. Screen box; 21. Screen plate; 22. Step shaft; 221. Large diameter shaft; 222. Small diameter shaft; 23. Feed pipe; 24. Torsion spring; 25. Spreading tray; 251. Combing plate; 252. Avoidance groove; 26. Dropping hole; 27. Driving part; 271. Reducer motor; 3. Conical block; 4. Sealing ring; 5. Rubber tension spring. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application Figures 1-8 , the technical solutions of the embodiments of the present application are clearly and completely described. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of this application.

[0043] In a first aspect, the present application provides a screening device for screening quartz sand, which adopts the following technical solution:

[0044] Reference Figure 1 and Figure 2 This embodiment provides a screening device for screening quartz sand, comprising a base 1, a screen box 2, a sieve plate 21, a servo motor 11, and a distribution mechanism. The screen box 2 is eccentrically connected to the top of the base 1, the sieve plate 21 is disposed within the inner cavity of the screen box 2, and the servo motor 11 is disposed on the base 1. When the servo motor 11 drives the screen box 2 to rotate eccentrically, the quartz sand on the sieve plate 21 moves outward in a planar spiral trajectory and is screened by the sieve plate 21. (This is the motion principle of a rocking screen in the prior art and will not be further described.)

[0045] Among them, reference Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8The material distribution mechanism includes a stepped shaft 22, a torsion spring 24, a material distribution plate 25, a material drop hole 26 and a driving member 27. The stepped shaft 22 is rotatably connected to the center of the screen box 2 and can pass through the screen plate 21. The stepped shaft 22 is fixedly connected by a large-diameter shaft body 221 at the top and a small-diameter shaft body 222 at the bottom, and the large-diameter shaft body 221 is hollow and communicates with the feed pipe 23 that passes through the top of the screen box 2 in a rotatable connection; the material distribution plate 25 is rotatably sleeved at the connection between the large-diameter shaft body 221 and the small-diameter shaft body 222 through a torsion spring 24 (the material distribution plate 25 is rotatably sleeved on the outside of the large-diameter shaft body 221 in a concave disc shape, and the bottom surface of the large-diameter shaft body 221 can abut against the inner bottom surface of the material distribution plate 25, and the small-diameter shaft body 222 is rotatably sleeved at the center of the material distribution plate 25 in a penetrating manner). The outer surface of the body 221 is provided with a spline for limiting the maximum rotation angle of the material spreading disc 25, which is used to prevent the torsion spring 24 from being damaged by excessive twisting. The material spreading blades of the material spreading disc 25 are all arranged in an arc shape. The material spreading disc 25 is located above the screen disc 21, and the bottom surface of the material spreading disc 25 and the bottom of the inner cavity of the large-diameter shaft body 221 are provided with a plurality of circumferentially arrayed blanking holes 26. The blanking holes 26 on the material spreading disc 25 can coincide with the large-diameter shaft body 221 on the large-diameter shaft body 221; the driving member 27 includes a reduction motor 271 arranged inside the screen box 2, and the output shaft of the reduction motor 271 is connected to the small-diameter shaft body 222 by a belt drive, which is used to drive the small-diameter shaft body 222 and the large-diameter shaft body 221 to rotate together.

[0046] When loading quartz sand, the personnel first feed the quartz sand into the inner cavity of the large diameter shaft 221 through the feeding pipe 23. At this time, the drop hole 26 on the spreading plate 25 coincides with the drop hole 26 on the large diameter shaft 221, so that the quartz sand passes through the drop hole 26 and falls on the sieve plate 21 for screening. In this state, the spreading blades of the spreading plate 25 can play a certain blocking role on the quartz sand, so as to prevent large particles of quartz sand from entraining small particles of quartz sand and being discharged from the discharge port on the upper layer of the sieve plate 21. At the same time, the reduction motor 271 drives the small diameter shaft 222 and the large diameter shaft 221 to rotate together through the belt drive. In this state, the spreading plate 25 will rotate along with the large diameter shaft 221 to spread the quartz sand flat on the sieve plate 21 (a certain gap is retained between the spreading blades of the spreading plate 25 and the upper surface of the sieve plate 21), so as to prevent the quartz sand from excessively piling up on the sieve plate 21 and affecting the screening efficiency. In addition, when there is a lot of quartz sand accumulated on the sieve plate 21, the resistance encountered by the spreading plate 25 when flattening the quartz sand will increase accordingly. At this time, the spreading plate 25 will overcome the elastic potential energy of the torsion spring 24 and rotate to a certain extent relative to the large-diameter shaft 221, so that the blanking holes 26 on the spreading plate 25 and the blanking holes 26 on the large-diameter shaft 221 are moderately misaligned, reducing the feeding rate of the quartz sand. After the quartz sand accumulated on the sieve plate 21 gradually decreases, the spreading plate 25 will automatically reset under the action of the elastic potential energy of the torsion spring 24, thereby restoring the feeding rate of the quartz sand. By dynamically adjusting the feeding rate, the possibility of large particles of quartz sand being discharged together with small particles of quartz sand when quartz sand is excessively accumulated on the sieve plate 21 is further reduced.

[0047] In addition, refer to Figure 4 A plurality of combing plates 251 distributed in a circumferential array are provided in the middle of the bottom surface of the spreading tray 25, and the combing plates 251 and the blanking holes 26 are spaced one by one in the circumferential direction, and each combing plate 251 is provided with a plurality of slots for quartz sand to pass through.

[0048] When the quartz sand falls onto the sieve plate 21 through the drop hole 26, the material distribution plate 25 will move synchronously with the rotation of the large-diameter shaft 221. At this time, the combing plate 251 on the material distribution plate 25 will rotate along with the material distribution plate 25, thereby performing a preliminary stirring and combing of the quartz sand falling on the sieve plate 21, dispersing the thick or uneven accumulation of quartz sand, and helping the quartz sand to be more evenly distributed on the surface of the sieve plate 21, ensuring that the quartz sand can smoothly pass through the sieve holes during the screening process, thereby improving the screening efficiency. At the same time, the orderly stirring of the combing plate 251 can also promote the mutual flow between the quartz sands, enhance the fluidity of the quartz sand on the sieve plate 21, and thus achieve a more efficient and more uniform screening operation.

[0049] In addition, refer to Figure 4An avoidance groove 252 is provided at one end of the bottom surface of the spreading blade of the spreading plate 25 close to the step shaft 22, which is used to provide a larger distribution space for the quartz sand in the loading state.

[0050] In the process of quartz sand falling onto the sieve plate 21 through the drop hole 26, the avoidance groove 252 can provide a larger space for the quartz sand in the loading state, so that the quartz sand has sufficient flow and dispersion space after falling into the sieve plate, reducing the probability of quartz sand accumulation or blockage between the spreading blades of the spreading plate 25 and the sieve plate 21 due to the narrow space, thereby reducing the possibility of quartz sand being stuck between the spreading blades of the spreading plate 25 and the sieve plate 21 and scratching the sieve plate 21 as the spreading plate 25 moves, thereby improving the service life of the sieve plate 21.

[0051] In addition, refer to Figure 3 and Figure 8 A conical block 3 is provided at the center of the bottom of the inner cavity of the large-diameter shaft body 221 to guide the quartz sand entering the inner cavity of the large-diameter shaft body 221 toward the direction close to the blanking hole 26.

[0052] When the quartz sand enters the inner cavity of the large-diameter shaft 221, the conical surface design of the conical block 3 allows the quartz sand to move along the conical block 3 in the direction away from the central axis of the large-diameter shaft 221, which helps to guide the quartz sand to smoothly enter the drop hole 26, and can improve the fluidity of the quartz sand in the inner cavity of the large-diameter shaft 221, effectively reducing the risk of accumulation and blockage of quartz sand in the inner cavity of the large-diameter shaft 221, and thus reducing the possibility of equipment shutdown and maintenance due to blockage, thereby ensuring the continuity and efficiency of the entire screening process.

[0053] Reference Figure 4 and Figure 8 A sealing ring 4 is provided at the connection between the large diameter shaft body 221 and the material spreading tray 25 to seal the gap between the large diameter shaft body 221 and the material spreading tray 25.

[0054] The sealing ring 4 can block and seal the gap between the large diameter shaft 221 and the material spreading tray 25 to prevent quartz sand from entering the gap between the large diameter shaft 221 and the material spreading tray 25 and affecting the relative rotation of the large diameter shaft 221 and the material spreading tray 25.

[0055] Reference Figure 1 and Figure 2 A plurality of rubber tension springs 5 ​​distributed in a circumferential array are provided between the bottom plate of the base 1 and the outer surface of the screen box 2 .

[0056] When the screen box 2 is in the screening process and swings and displaces on the base 1, the multiple rubber tension springs 5 ​​cooperate with each other to provide a certain traction support for the screen box 2, reducing the possibility of the screen box 2 tipping over and making the quartz sand screening work more stable.

[0057] The implementation principle of a screening device for screening quartz sand in the embodiment of the present application is as follows:

[0058] When the quartz sand screening work is carried out, the servo motor 11 runs to drive the screen box 2 to rotate eccentrically, and then the personnel feeds the quartz sand into the inner cavity of the large-diameter shaft 221 through the feed pipe 23. Then the quartz sand can move along the conical surface of the conical block 3 toward the direction close to the drop hole 26. At this time, the drop hole 26 on the spreading plate 25 coincides with the drop hole 26 on the large-diameter shaft 221, so that the quartz sand passes through the drop hole 26 and falls on the screen plate 21 for screening. In this state, the spreading blades of the spreading plate 25 can play a certain blocking role on the quartz sand, so as to prevent large particles of quartz sand from entraining small particles of quartz sand and being discharged from the discharge port on the upper layer of the screen plate 21.

[0059] At the same time, the reduction motor 271 drives the small diameter shaft 222 and the large diameter shaft 221 to rotate together through belt transmission. In this state, the spreading plate 25 will rotate with the large diameter shaft 221 to spread the quartz sand on the sieve plate 21 to prevent the quartz sand from excessively accumulating on the sieve plate 21 and affecting the screening efficiency. In addition, when there is a lot of quartz sand accumulated on the sieve plate 21, the resistance encountered by the spreading plate 25 when flattening the quartz sand will increase accordingly. At this time, the spreading plate 25 will overcome the elastic potential energy of the torsion spring 24 and rotate to a certain extent relative to the large-diameter shaft 221, so that the blanking holes 26 on the spreading plate 25 and the blanking holes 26 on the large-diameter shaft 221 are moderately misaligned, reducing the feeding rate of the quartz sand. After the quartz sand accumulated on the sieve plate 21 gradually decreases, the spreading plate 25 will automatically reset under the action of the elastic potential energy of the torsion spring 24, thereby restoring the feeding rate of the quartz sand. By dynamically adjusting the feeding rate, the possibility of large particles of quartz sand being discharged together with small particles of quartz sand when quartz sand is excessively accumulated on the sieve plate 21 is further reduced.

[0060] As the quartz sand falls onto the upper surface of the sieve plate 21 through the drop holes 26, the spreading plate 25 rotates along with the large-diameter shaft 221, and the combing plate 251 can perform a preliminary stirring and combing of the quartz sand, thereby making the quartz sand more evenly distributed on the sieve plate 21 and reducing the possibility of local accumulation of quartz sand on the sieve plate 21. At the same time, due to the presence of the avoidance groove 252, the quartz sand in the feeding state has a larger distribution space, thereby preventing the quartz sand from getting stuck between the spreading blades of the spreading plate 25 and the sieve plate 21 and affecting the subsequent screening process.

[0061] When the screen box 2 is in the screening process and swings and displaces on the base 1, the multiple rubber tension springs 5 ​​cooperate with each other to provide a certain traction support for the screen box 2, reducing the possibility of the screen box 2 tipping over and making the quartz sand screening work more stable.

[0062] In a second aspect, the present application provides a screening method for screening quartz sand, which is applied to a screening device for screening quartz sand in the first aspect, comprising:

[0063] S1, the servo motor 11 drives the screen box 2 and the sieve plate 21 arranged inside to rotate eccentrically. At the same time, the personnel feeds quartz sand into the inner cavity of the large-diameter shaft 221 through the feed pipe 23, and then the quartz sand falls on the sieve plate 21 through the drop hole 26 for screening;

[0064] S2, the driving member 27 drives the small diameter shaft 222 and the large diameter shaft 221 to rotate together, so that the spreading plate 25 rotates along with the large diameter shaft 221, and the spreading plate 25 is used to spread the quartz sand on the sieve plate 21, thereby reducing the accumulation thickness of the quartz sand on the sieve plate 21;

[0065] S3, under the screening action of the sieve plate 21, large particles of quartz sand can be discharged from the discharge port of the upper layer of the sieve plate 21, and small particles of quartz sand will be discharged from the discharge port of the lower layer of the sieve plate 21 after passing through the sieve holes on the sieve plate 21.

[0066] In S1, when the quartz sand moves toward the distal end of the sieve plate 21 due to the eccentric rotation of the sieve plate 21, the spreading blades of the spreading plate 25 can play a certain blocking role on the quartz sand, forcing the quartz sand to move along the spreading blades of the spreading plate 25, thereby extending the movement path and reducing the movement speed of the quartz sand on the sieve plate 21, thereby reducing the probability of large particles of quartz sand being discharged together with small particles of quartz sand.

[0067] In S2, when there is a lot of quartz sand accumulated on the sieve plate 21, the resistance encountered by the spreading plate 25 when flattening the quartz sand will increase accordingly. At this time, the spreading plate 25 will rotate relative to the large-diameter shaft 221, so that the drop holes 26 on the spreading plate 25 and the drop holes 26 on the large-diameter shaft 221 are misaligned, and the speed at which the quartz sand falls from the drop holes 26 onto the sieve plate 21 is reduced, thereby reducing the possibility of excessive accumulation of quartz sand on the sieve plate 21.

[0068] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A screening device for screening quartz sand, comprising a base and a screen box eccentrically connected to the top thereof, a screen plate for screening quartz sand being provided in the inner cavity of the screen box, and a servo motor for driving the eccentric rotation of the screen box being provided on the base, characterized in that: The center of the screen box is rotatably connected to a stepped shaft that can pass through the screen plate, and the stepped shaft consists of a large-diameter shaft body at the top and a small-diameter shaft body at the bottom. The large-diameter shaft body is hollow and communicates with a feed pipe that passes through the top of the screen box in a rotatable connection. A spreading disc is provided at the connection between the large-diameter shaft body and the small-diameter shaft body in a rotatable sleeve manner through a torsion spring. The spreading blades of the spreading disc are all arc-shaped, and the spreading disc is located above the sieve disc. A plurality of blanking holes distributed in a circumferential array are provided on the bottom of the inner cavity of the large-diameter shaft body and the spreading disc. A driving member is provided inside the screen box for driving the small-diameter shaft body and the large-diameter shaft body to rotate together; A plurality of combing plates distributed in a circumferential array are provided in the middle of the bottom surface of the spreading tray, and the combing plates and the blanking holes are spaced one by one in the circumferential direction, and each combing plate is provided with a plurality of slots for quartz sand to pass through; The bottom surface of the spreading blade of the spreading plate is provided with an avoidance groove at one end close to the step axis, which is used to provide a larger distribution space for the quartz sand in the feeding state; A conical block is provided at the center of the bottom of the inner cavity of the large-diameter shaft body, for guiding the quartz sand entering the inner cavity of the large-diameter shaft body toward the direction close to the blanking hole; A sealing ring is provided at the connection between the large-diameter shaft and the material spreading tray to seal the gap between the large-diameter shaft and the material spreading tray.

2. A screening device for screening quartz sand according to claim 1, characterized in that: The driving member includes a reduction motor arranged inside the screen box, and the output shaft of the reduction motor is connected to the small-diameter shaft body through a belt drive.

3. A screening device for screening quartz sand according to claim 1, characterized in that: A plurality of rubber tension springs distributed in a circumferential array are arranged between the bottom plate of the base and the outer surface of the screen box.

4. A screening method for screening quartz sand, applied to the screening device for screening quartz sand according to claim 1, characterized in that: include: S1, the servo motor drives the screen box and the sieve plate inside it to rotate eccentrically. At the same time, the personnel feeds quartz sand into the inner cavity of the large-diameter shaft through the feed pipe, and then the quartz sand falls on the sieve plate through the drop hole for screening; S2, the driving member drives the small diameter shaft and the large diameter shaft to rotate together, so that the spreading plate rotates along with the large diameter shaft, and the quartz sand is spread on the sieve plate by the spreading plate, thereby reducing the accumulation thickness of the quartz sand on the sieve plate; S3, under the screening action of the sieve plate, large particles of quartz sand can be discharged from the discharge port on the upper layer of the sieve plate, and small particles of quartz sand will be discharged from the discharge port on the lower layer of the sieve plate after passing through the sieve holes on the sieve plate.

5. A screening method for screening quartz sand according to claim 4, characterized in that: In S1, when the quartz sand moves toward the distal end of the sieve disc due to the eccentric rotation of the sieve disc, the spreading blades of the spreading disc can play a certain blocking role on the quartz sand, forcing the quartz sand to move along the spreading blades of the spreading disc, thereby extending the movement path and reducing the movement speed of the quartz sand on the sieve disc, thereby reducing the probability of large particles of quartz sand being discharged together with small particles of quartz sand.

6. A screening method for screening quartz sand according to claim 4, characterized in that: In said S2, when there is a lot of quartz sand accumulated on the sieve plate, the resistance encountered by the spreading plate when flattening the quartz sand will increase accordingly. At this time, the spreading plate will rotate relative to the large-diameter shaft, so that the drop holes on the spreading plate and the drop holes on the large-diameter shaft will be misaligned, and the speed at which the quartz sand falls from the drop holes onto the sieve plate will be reduced, thereby reducing the possibility of excessive accumulation of quartz sand on the sieve plate.

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