Screening device and method for screening quartz sand

Abstract

The invention provides a screening device and method for screening quartz sand, and belongs to the technical field of quartz sand processing, the screening device comprises a base and a screening box eccentrically and rotatably connected to the top of the base, a screening disc for screening the quartz sand is arranged in an inner cavity of the screening box, and a servo motor is arranged on the base; a step shaft capable of penetrating through the sieve tray is rotationally connected to the center of the sieve box, the step shaft is composed of a large-diameter shaft body at the top and a small-diameter shaft body at the bottom, and the large-diameter shaft body is arranged in a hollow mode and communicates with a feeding pipe arranged at the top of the sieve box in a penetrating mode in a rotating connection mode; a material spreading disc is arranged at the joint of the large-diameter shaft body and the small-diameter shaft body through a torsional spring in a rotating sleeving mode, a plurality of material falling holes distributed in a circumferential array mode are formed in the bottom of an inner cavity of the large-diameter shaft body and the material spreading disc correspondingly, and a driving part is arranged in the screen box. The possibility that small-particle quartz sand is easily wrapped by large-particle quartz sand and discharged out of a screening area together with the large-particle quartz sand when too much quartz sand is accumulated on the screening tray can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of quartz sand processing, and particularly relates to a screening device and method for screening quartz sand. Background Art

[0002] Quartz sand is a fine-grained material made from high-purity silica through a fine screening and purification process. Due to its excellent physical and chemical properties, quartz sand has a wide range of applications in multiple industrial fields. First, in the glass manufacturing industry, quartz sand, as one of the main raw materials, provides the basic framework of glass and is used to produce various types of glass products, including flat glass, bottles and jars, and optical glass. Second, in the foundry industry, quartz sand is used as a high-quality sand mold material with good heat resistance and molding properties to help manufacture high-precision metal parts. In addition, in the ceramic industry, it serves as a key raw material or aggregate, which can improve the hardness, heat resistance, and overall quality of ceramic products, making ceramic products more durable and beautiful. In the filtration industry, quartz sand is widely used as a filtration medium, which can effectively remove sediment, impurities, and other suspended solids in liquids, improving the cleanliness and purity of liquids. The main advantages of quartz sand are its high hardness and strong abrasion resistance, which can maintain the stability of its structure for a long time in various processing and use environments and are not easily damaged by friction or mechanical action. At the same time, it has excellent chemical stability and can remain unreactive and unchanged in complex environments such as acid-base corrosion. These properties ensure the reliability and durability of quartz sand in the screening and processing process and provide a high-quality material basis for industrial production.

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

[0004] A Chinese patent document with the reference publication number CN116786412B, publication date November 3, 2023, and title "A Circular Swing Sieve", includes a base. A support seat is provided at the top of the base. Above the support seat is a top cover. An inlet is provided in the middle of the top cover. A screening module is provided between the top cover and the support seat. The screening module includes a top screen, a middle screen, and a lower screen. By adding a diversion ring inside the circular swing sieve, the present invention can increase the screening time of materials on the circular swing sieve and can screen the materials multiple times, effectively improving the screening effect and efficiency.

[0005] Referring to the above technical solution, when screening quartz sand using a swing sieve, to ensure the screening efficiency, the quartz sand is usually transferred to the sieve tray in a continuous feeding manner. As the quartz sand continues to be fed, the quartz sand often accumulates on the sieve tray. In this state, the quartz sand piled on the upper layer may move to the edge of the sieve tray due to the vibration of the sieve tray or its own fluidity. The small-particle quartz sand is easily carried by the large-particle quartz sand and discharged from the discharge port above the sieve tray together, resulting in the failure of the small-particle quartz sand to be separated from the large-particle quartz sand, thereby affecting 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, mainly used to solve the problem that when the quartz sand accumulates excessively on the sieve tray, the small-particle quartz sand is easily carried by the large-particle quartz sand and discharged from the discharge port above the sieve tray together.

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

[0008] In a first aspect, the present application provides a screening device for screening quartz sand, including a base and a sieve box eccentrically and rotationally connected to the top of the base. A sieve tray for screening quartz sand is arranged in the inner cavity of the sieve box. A servo motor for driving the sieve box to rotate eccentrically is arranged on the base. A stepped shaft that can penetrate the sieve tray is rotationally connected at the center of the sieve box. The stepped shaft is composed 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 is connected in a rotational connection manner to a feed pipe penetrating through the top of the sieve box. A spreading tray is arranged in a rotational sleeving manner at the connection between the large-diameter shaft body and the small-diameter shaft body through a torsion spring. The spreading blades of the spreading tray are all arc-shaped, and the spreading tray is located above the sieve tray. A plurality of circumferentially arrayed material dropping holes are opened at the bottom of the inner cavity of the large-diameter shaft body and on the spreading tray. A driving member is arranged inside the sieve box, and the driving member is used to drive the small-diameter shaft body and the large-diameter shaft body to rotate together.

[0009] By adopting the above technical solution, during the feeding process of quartz sand, personnel first feed the quartz sand into the inner cavity of the large-diameter shaft body through the feeding pipe. At this time, the blanking holes on the blanking plate are aligned with the blanking holes on the large-diameter shaft body, enabling the quartz sand to smoothly pass through the blanking holes and fall onto the sieve plate for screening. The blanking blades of the blanking plate can play a blocking role at this stage to prevent large-particle quartz sand from carrying small particles out together. Driven by the driving member, the small-diameter shaft body and the large-diameter shaft body rotate, and the blanking plate rotates accordingly, spreading the quartz sand evenly on the sieve plate to avoid excessive accumulation and affect the screening efficiency. When there is a large amount of quartz sand accumulated on the sieve plate, the resistance of the blanking plate increases, and it will overcome the elasticity of the torsion spring and rotate to a certain extent with the large-diameter shaft body, resulting in the misalignment of the blanking holes, thereby slowing down the feeding rate. When the accumulation decreases, the blanking plate automatically resets under the action of the spring, and the feeding rate resumes, effectively avoiding the discharge of large particles and small particles together, ensuring the smoothness and efficiency of screening.

[0010] Optionally, a plurality of combing plates are arranged at the middle part of the bottom surface of the blanking plate and are circumferentially and arrayedly distributed, and the combing plates and the blanking holes are arranged at intervals in the circumferential direction. A plurality of notches for the quartz sand to pass through are formed on each combing plate.

[0011] By adopting the above technical solution, when the quartz sand falls onto the sieve plate through the blanking hole, the blanking plate will rotate together with the large-diameter shaft body. During this process, the combing plates can initially stir and comb the quartz sand, which helps to disperse the accumulated particles and make the distribution of the quartz sand on the sieve plate more uniform. It can not only reduce the possibility of local accumulation of the quartz sand, but also improve the effect of the quartz sand screening work to a certain extent.

[0012] Optionally, an avoidance groove is arranged at one end of the bottom surface of the blanking blade of the blanking plate close to the stepped shaft to provide a larger distribution space for the quartz sand in the feeding state.

[0013] By adopting the above technical solution, during the process of the quartz sand falling onto the sieve plate through the blanking hole, the avoidance groove can provide a larger space and passage for the quartz sand in the feeding state, which helps the quartz sand to quickly spread and disperse instantly when it falls onto the sieve plate, thereby avoiding the accumulation or jamming of the quartz sand between the contact surface of the blanking blade of the blanking plate and the sieve plate, reducing the risk of blockage and accumulation of the quartz sand, and at the same time ensuring that the quartz sand can smoothly flow into the screening area, thereby improving the continuity and efficiency of screening, being beneficial to improving the smoothness of the screening process, and ensuring the normal progress of the subsequent screening work.

[0014] Optionally, a conical block is arranged at the center of the bottom of the inner cavity of the large-diameter shaft body to guide the quartz sand entering the inner cavity of the large-diameter shaft body towards the 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 body, by utilizing the conical surface of the conical block, the quartz sand can move along the inclination angle of the conical surface in a direction away from the central axis of the large-diameter shaft body, prompting the quartz sand to pass downward through the blanking hole and enter the screening area, thereby reducing the risk of blockage occurring inside the large-diameter shaft body and further ensuring the continuity and stability of the screening process.

[0016] Optionally, a sealing ring is sleeved at the connection between the large-diameter shaft body and the spreading plate for sealing the gap between the large-diameter shaft body and the spreading plate.

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

[0018] Optionally, the driving member includes a reduction motor disposed inside the screening box, and the output shaft of the reduction motor is connected to the small-diameter shaft body by means of belt transmission.

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

[0020] By adopting the above technical solution, when the screening box is performing screening operations, as the screening box undergoes rocking displacement, the plurality of rubber tension springs will act in coordination to reduce the possibility of the screening box tipping over or shaking excessively, thereby enhancing the stability of the screening work.

[0021] 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 described in the first aspect, and includes: S1, the servo motor operates to drive the screening box and the sieve tray disposed inside it to rotate eccentrically. At the same time, the operator feeds the quartz sand into the inner cavity of the large-diameter shaft body through the feed pipe, and then the quartz sand falls onto the sieve tray through the blanking hole for screening work; S2, the driving member drives the small-diameter shaft body and the large-diameter shaft body to rotate together, so that the spreading plate rotates together with the large-diameter shaft body, and the quartz sand is spread flat on the sieve tray by using the spreading plate to reduce the stacking thickness of the quartz sand on the sieve tray; S3, under the screening action of the sieve tray, the large-particle quartz sand can be discharged from the discharge port on the upper layer of the sieve tray, and the small-particle quartz sand will be discharged from the discharge port on the lower layer of the sieve tray after passing through the sieve holes on the sieve tray.

[0022] By adopting the above technical solution, the servo motor drives the sieve box and the internal sieve tray to rotate eccentrically. Meanwhile, the personnel feed quartz sand into the inner cavity of the large-diameter shaft through the feed pipe, and the quartz sand falls onto the sieve tray through the blanking holes for screening. The driving member drives the small-diameter shaft body and the large-diameter shaft body to rotate synchronously, so that the spreading tray rotates with the large-diameter shaft body, evenly spreads the quartz sand on the sieve tray, and reduces the stacking thickness. After screening, the large-particle quartz sand is discharged from the upper discharge port, and the small-particle quartz sand passes through the sieve holes and is discharged from the lower discharge port, thereby realizing the particle classification screening work of quartz sand.

[0023] Optionally, in the step S1, when the quartz sand moves towards the far center of the sieve tray due to the eccentric rotation of the sieve tray, the spreading blades of the spreading tray can play a certain blocking role on the quartz sand, forcing the quartz sand to move along the spreading blades of the spreading tray, and reducing the moving speed of the quartz sand on the sieve tray by extending the movement path, thereby reducing the probability that large-particle quartz sand is discharged together with small-particle quartz sand.

[0024] By adopting the above technical solution, the spreading blades of the spreading tray play a certain blocking role on the quartz sand, forcing the quartz sand to move along the blades, so as to extend the movement path of the quartz sand, reduce the moving speed of the quartz sand on the sieve tray, effectively reduce the probability that large-particle quartz sand is discharged together with small-particle quartz sand, and improve the classification effect and efficiency of screening.

[0025] Optionally, in the step S2, when there is a large amount of quartz sand accumulated on the sieve tray, the resistance received by the spreading tray when spreading the quartz sand will increase accordingly. At this time, the spreading tray will rotate relative to the large-diameter shaft body, so that the blanking holes on the spreading tray are misaligned with the blanking holes on the large-diameter shaft body, reducing the speed at which the quartz sand falls from the blanking holes onto the sieve tray, and further reducing the possibility of excessive accumulation of quartz sand on the sieve tray.

[0026] By adopting the above technical solution, the spreading tray can rotate relative to the large-diameter shaft body according to the accumulation amount of quartz sand on the sieve tray, so that the blanking holes on the spreading tray are misaligned with the blanking holes on the large-diameter shaft body, slowing down the speed at which the quartz sand falls from the blanking holes onto the sieve tray, reducing the probability of excessive accumulation of quartz sand on the sieve tray, and improving the stability and smoothness of the subsequent screening work.

[0027] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects: 1. During the screening process of quartz sand, the residence time of quartz sand on the sieve tray is extended by adopting the method of blocking and guiding, reducing the possibility that the quartz sand quickly moves to the edge part of the sieve tray. At the same time, the quartz sand accumulated on the sieve tray can be evenly spread, which helps the quartz sand to evenly pass through the sieve holes on the sieve tray, avoiding the phenomenon of accumulation or blockage at local points on the sieve tray, and then improving the smoothness of the quartz sand screening work and the final screening quality.

[0028] 2. When leveling the quartz sand on the sieve tray, the spreading tray can dynamically adjust the feeding rate of the quartz sand according to the accumulation amount of the quartz sand on the sieve tray, which can further reduce the probability of excessive accumulation of the quartz sand on the sieve tray, thereby reasonably controlling the supply rhythm of the quartz sand, ensuring the uniform distribution of the quartz sand on the sieve tray, and at the same time avoiding the possibility of excessive accumulation of the quartz sand causing a large burden on the sieve tray and extending the service life of the sieve tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a screening device for screening quartz sand according to the present application; Figure 2 It is a cross-sectional view of the base and the sieve box of the present application; Figure 3 It is a front view of the base and the sieve box of the present application; Figure 4 It is an exploded view of the stepped shaft and the spreading tray of the present application; Figure 5 It is a schematic structural diagram of the torsion spring and the spreading tray of the present application; Figure 6 It is a bottom view of the large-diameter shaft body and the material dropping hole on the spreading tray of the present application in a coincident state; Figure 7 It is a bottom view of the large-diameter shaft body and the material dropping hole on the spreading tray of the present application in a misaligned state; Figure 8 For the present application Figure 3 Local enlarged view of area A in.

[0030] Description of reference numerals: 1. Base; 11. Servo motor; 2. Sieve box; 21. Sieve tray; 22. Stepped shaft; 221. Large-diameter shaft body; 222. Small-diameter shaft body; 23. Feed pipe; 24. Torsion spring; 25. Spreading tray; 251. Comb plate; 252. Avoidance groove; 26. Material dropping hole; 27. Driving member; 271. Reduction motor; 3. Conical block; 4. Sealing ring; 5. Rubber tension spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the Figures 1 - 8 of the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0032] In a first aspect, the present application provides a screening device for screening quartz sand, adopting the following technical solutions: Referring to Figure 1 and Figure 2, this embodiment provides a screening device for screening quartz sand, including a base 1, a screening box 2, a screening plate 21, a servo motor 11 and a feeding mechanism. Among them, the screening box 2 is arranged at the top of the base 1 in a way of eccentric rotation connection, the screening plate 21 is arranged inside the screening box 2, the servo motor 11 is arranged on the base 1. When the servo motor 11 runs to drive the screening box 2 to rotate eccentrically, the quartz sand on the screening plate 21 can move outward in a planar spiral trajectory and be screened by the screening plate 21 (this is the movement principle of a swing sieve in the prior art, so it will not be elaborated here).

[0033] Among them, referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , the feeding mechanism includes a stepped shaft 22, a torsion spring 24, a spreading plate 25, a blanking hole 26 and a driving member 27. The stepped shaft 22 is rotatably connected at the center of the screening box 2 and can penetrate the screening 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 is connected to a feeding pipe 23 penetrating through the top of the screening box 2 in a rotatable connection manner; the spreading plate 25 is arranged at the connection of the large-diameter shaft body 221 and the small-diameter shaft body 222 in a way of rotatably sleeving through the torsion spring 24 (the spreading plate 25 is in the shape of a concave disk and rotatably sleeved outside the large-diameter shaft body 221, and the bottom surface of the large-diameter shaft body 221 can abut against the inner bottom surface of the spreading plate 25, and the small-diameter shaft body 222 is rotatably sleeved through the center of the spreading plate 25 in a penetrating manner). A spline for restricting the maximum rotation angle of the spreading plate 25 is arranged on the outer surface of the large-diameter shaft body 221 to prevent the torsion spring 24 from being damaged due to excessive torsion. The spreading blades of the spreading plate 25 are all arranged in an arc shape. The spreading plate 25 is located above the screening plate 21, and a plurality of blanking holes 26 distributed in a circumferential array are opened on the bottom surface of the spreading plate 25 and the bottom of the inner cavity of the large-diameter shaft body 221. The blanking holes 26 on the spreading plate 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 screening box 2. The output shaft of the reduction motor 271 is connected to the small-diameter shaft body 222 through a belt drive to drive the small-diameter shaft body 222 and the large-diameter shaft body 221 to rotate together.

[0034] When feeding quartz sand, the operator first feeds the quartz sand into the inner cavity of the large-diameter shaft body 221 through the feed pipe 23. At this time, the material dropping holes 26 on the material spreading plate 25 coincide with the material dropping holes 26 on the large-diameter shaft body 221, so that the quartz sand passes through the material dropping holes 26 and falls onto the sieve plate 21 for screening. In this state, the material spreading blades of the material spreading plate 25 can play a certain blocking role on the quartz sand to prevent large-particle quartz sand from carrying small-particle quartz sand and discharging them together from the discharge port on the upper layer of the sieve plate 21. At the same time, the reduction motor 271 runs and drives the small-diameter shaft body 222 and the large-diameter shaft body 221 to rotate together through belt transmission. In this state, the material spreading plate 25 will rotate with the large-diameter shaft body 221 to spread the quartz sand flat on the sieve plate 21 (there is a certain gap between the material spreading blades of the material spreading plate 25 and the upper surface of the sieve plate 21) to prevent the quartz sand from accumulating excessively on the sieve plate 21 and affecting the screening efficiency. In addition, when there is more quartz sand accumulated on the sieve plate 21, the resistance received by the material spreading plate 25 when spreading the quartz sand will increase accordingly. At this time, the material spreading plate 25 will overcome the elastic potential energy of the torsion spring 24 and rotate relative to the large-diameter shaft body 221 to a certain extent, so that the material dropping holes 26 on the material spreading plate 25 are moderately misaligned with the material dropping holes 26 on the large-diameter shaft body 221, reducing the feeding rate of the quartz sand. After the quartz sand accumulated on the sieve plate 21 gradually decreases, the material spreading plate 25 will automatically reset under the action of the elastic potential energy of the torsion spring 24, so that the feeding rate of the quartz sand is restored. By dynamically adjusting the feeding rate, the possibility that large-particle quartz sand carries small-particle quartz sand and discharges them together when the quartz sand accumulates excessively on the sieve plate 21 is further reduced.

[0035] In addition, referring to Figure 4 , a plurality of combing plates 251 are arranged in a circumferentially arrayed manner in the middle of the bottom surface of the material spreading plate 25, and the combing plates 251 and the material dropping holes 26 are arranged at intervals one by one in the circumferential direction. A plurality of notches for the quartz sand to pass through are formed in each combing plate 251.

[0036] When the quartz sand passes through the material dropping holes 26 and falls onto the sieve plate 21, since the material spreading plate 25 will move synchronously with the rotation of the large-diameter shaft body 221, the combing plates 251 on the material spreading plate 25 will rotate with the material spreading plate 25 at this time, so as to initially stir and comb the quartz sand falling onto the sieve plate 21, disperse the quartz sand with a relatively thick or uneven accumulation, help the quartz sand to be more evenly distributed on the surface of the sieve plate 21, ensure that the quartz sand can smoothly pass through the sieve holes during the screening process, and improve the screening efficiency. At the same time, the orderly stirring of the combing plates 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 realize a more efficient and more uniform screening operation.

[0037] In addition, referring to Figure 4, at one end of the bottom surface of the spreading blade of the spreading tray 25 close to the stepped shaft 22, an avoidance groove 252 is provided to provide a larger distribution space for the quartz sand in the feeding state.

[0038] During the process that the quartz sand falls onto the sieve tray 21 through the blanking hole 26, the avoidance groove 252 can provide a larger space for the quartz sand in the feeding state, so that the quartz sand has sufficient flowing and dispersing space after falling onto the sieve tray, reducing the probability of the quartz sand accumulating or blocking between the spreading blade of the spreading tray 25 and the sieve tray 21 due to the narrow space, and further reducing the possibility that the sieve tray 21 is scratched as the spreading tray 25 moves after the quartz sand gets stuck between the spreading blade of the spreading tray 25 and the sieve tray 21, so as to improve the service life of the sieve tray 21.

[0039] In addition, referring to Figure 3 and Figure 8 , at the center of the bottom of the inner cavity of the large-diameter shaft body 221, a tapered block 3 is provided to guide the quartz sand entering the inner cavity of the large-diameter shaft body 221 towards the direction close to the blanking hole 26.

[0040] When the quartz sand enters the inner cavity of the large-diameter shaft body 221, by using the tapered surface design of the tapered block 3, the quartz sand can move along the tapered block 3 towards the direction away from the central axis of the large-diameter shaft body 221, which helps to guide the quartz sand to smoothly enter the blanking hole 26, can improve the fluidity of the quartz sand in the inner cavity of the large-diameter shaft body 221, effectively reduce the risk of the quartz sand accumulating and blocking in the inner cavity of the large-diameter shaft body 221, and further reduce the possibility of the equipment shutdown and maintenance caused by the blockage, so as to ensure the continuity and high efficiency of the entire screening process.

[0041] Referring to Figure 4 and Figure 8 , a sealing ring 4 is sleeved at the connection between the large-diameter shaft body 221 and the spreading tray 25 to seal the gap between the large-diameter shaft body 221 and the spreading tray 25.

[0042] The sealing ring 4 can block and seal the gap between the large-diameter shaft body 221 and the spreading tray 25 to prevent the quartz sand from entering the gap between the large-diameter shaft body 221 and the spreading tray 25 and affecting the relative rotation of the large-diameter shaft body 221 and the spreading tray 25.

[0043] Referring to Figure 1 and Figure 2 , a plurality of rubber tension springs 5 distributed in a circumferential array are provided between the bottom plate body of the base 1 and the outer surface of the sieve box 2.

[0044] When the sieve box 2 swings and displaces on the base 1 during the screening process, the plurality of rubber tension springs 5 can cooperate with each other to provide a certain traction and support effect for the sieve box 2, reducing the possibility of the sieve box 2 tipping over and making the screening work of the quartz sand more stable.

[0045] The implementation principle of a screening device for screening quartz sand in an embodiment of this application is as follows: When carrying out the quartz sand screening work, the servo motor 11 runs to drive the sieve box 2 to rotate eccentrically. Then, the quartz sand is fed into the inner cavity of the large-diameter shaft body 221 through the feed pipe 23 by personnel. Then, the quartz sand can move along the conical surface of the conical block 3 towards the direction close to the blanking hole 26. At this time, the blanking hole 26 on the blanking plate 25 coincides with the blanking hole 26 on the large-diameter shaft body 221, so that the quartz sand passes through the blanking hole 26 and falls on the sieve plate 21 for screening work. In this state, the blanking blades of the blanking plate 25 can play a certain blocking role on the quartz sand to prevent large-particle quartz sand from carrying small-particle quartz sand and discharging together from the discharge port on the upper layer of the sieve plate 21.

[0046] Meanwhile, the reduction motor 271 runs and drives the small-diameter shaft body 222 and the large-diameter shaft body 221 to rotate together through belt drive. In this state, the blanking plate 25 will rotate together with the large-diameter shaft body 221 to flatten the quartz sand on the sieve plate 21 to prevent the quartz sand from accumulating excessively on the sieve plate 21 and affecting the screening efficiency. In addition, when there is more quartz sand accumulated on the sieve plate 21, the resistance received by the blanking plate 25 when flattening the quartz sand will increase accordingly. At this time, the blanking plate 25 will overcome the elastic potential energy of the torsion spring 24 and rotate relative to the large-diameter shaft body 221 to a certain extent, so that the blanking hole 26 on the blanking plate 25 is moderately misaligned with the blanking hole 26 on the large-diameter shaft body 221, reducing the feeding rate of the quartz sand. After the quartz sand accumulated on the sieve plate 21 gradually decreases, the blanking plate 25 will automatically reset under the action of the elastic potential energy of the torsion spring 24, so that the feeding rate of the quartz sand is restored. By dynamically adjusting the feeding rate, the possibility that large-particle quartz sand carries small-particle quartz sand and discharges together when the quartz sand accumulates excessively on the sieve plate 21 is further reduced.

[0047] During the process of the quartz sand falling on the upper surface of the sieve plate 21 through the blanking hole 26, since the blanking plate 25 will rotate together with the large-diameter shaft body 221, at this time, the combing plate 251 can initially stir and comb the quartz sand, making the quartz sand more evenly distributed on the sieve plate 21 and reducing the possibility of local accumulation of the quartz sand on the sieve plate 21. At the same time, due to the existence of the avoidance groove 252, the quartz sand in the feeding state will have a larger distribution space to prevent the quartz sand from getting stuck between the blanking blades of the blanking plate 25 and the sieve plate 21 and affecting the subsequent screening work.

[0048] When the sieve box 2 sways and displaces on the base 1 during the screening process, the multiple rubber tension springs 5 cooperate with each other to provide a certain traction and support effect for the sieve box 2, reducing the possibility of the sieve box 2 tipping over and making the screening work of the quartz sand more stable.

[0049] 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, and includes: S1. The servo motor 11 operates to drive the screen box 2 and the screen plate 21 disposed inside it to rotate eccentrically. Meanwhile, the personnel feed the quartz sand into the inner cavity of the large-diameter shaft body 221 through the feed pipe 23. Then, the quartz sand falls on the screen plate 21 through the material dropping hole 26 for screening work. S2. The driving member 27 drives the small-diameter shaft body 222 and the large-diameter shaft body 221 to rotate together, so that the spreading plate 25 rotates together with the large-diameter shaft body 221. The spreading plate 25 is used to spread the quartz sand flat on the screen plate 21, reducing the stacking thickness of the quartz sand on the screen plate 21. S3. Under the screening action of the screen plate 21, the large-particle quartz sand can be discharged from the discharge port on the upper layer of the screen plate 21, and the small-particle quartz sand will be discharged from the discharge port on the lower layer of the screen plate 21 after passing through the screen holes on the screen plate 21.

[0050] In S1, when the quartz sand moves towards the far center of the screen plate 21 due to the eccentric rotation of the screen 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, reducing the moving speed of the quartz sand on the screen plate 21 by extending the movement path, and thus reducing the probability that the large-particle quartz sand carries the small-particle quartz sand and is discharged together.

[0051] In S2, when there is more quartz sand accumulated on the screen plate 21, the resistance received by the spreading plate 25 when spreading the quartz sand will increase accordingly. At this time, the spreading plate 25 will rotate relative to the large-diameter shaft body 221, so that the material dropping holes 26 on the spreading plate 25 are misaligned with the material dropping holes 26 on the large-diameter shaft body 221, reducing the speed at which the quartz sand falls on the screen plate 21 from the material dropping hole 26, and thus reducing the possibility of excessive accumulation of the quartz sand on the screen plate 21.

[0052] The above is the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A screening device for screening quartz sand, comprising a base (1) and a screening box (2) eccentrically and rotationally connected to the top thereof. A screening tray (21) for screening quartz sand is arranged in the inner cavity of the screening box (2). A servo motor (11) for driving the screening box (2) to rotate eccentrically is arranged on the base (1). It is characterized in that: A stepped shaft (22) capable of penetrating the screening tray (21) is rotationally connected to the center of the screening box (2). The stepped shaft (22) is composed of a large-diameter shaft body (221) at the top and a small-diameter shaft body (222) at the bottom. The large-diameter shaft body (221) is hollow and communicated with a feed pipe (23) penetrating through the top of the screening box (2) in a rotationally connected manner. A spreading tray (25) is arranged at the connection between the large-diameter shaft body (221) and the small-diameter shaft body (222) in a rotationally sleeved manner through a torsion spring (24). The spreading blades of the spreading tray (25) are all arc-shaped. The spreading tray (25) is located above the screening tray (21). A plurality of circumferentially and arrayedly distributed blanking holes (26) are formed at the bottom of the inner cavity of the large-diameter shaft body (221) and on the spreading tray (25). A driving member (27) is arranged inside the screening box (2), and the driving member (27) is used to drive the small-diameter shaft body (222) and the large-diameter shaft body (221) to rotate together.

2. The screening device for screening quartz sand according to claim 1, wherein: A plurality of circumferentially and arrayedly distributed combing plates (251) are arranged in the middle of the bottom surface of the spreading tray (25), and the combing plates (251) and the blanking holes (26) are arranged at intervals in the circumferential direction one by one. A plurality of notches for quartz sand to pass through are formed on each combing plate (251).

3. A screening device for screening quartz sand according to claim 1, characterized in that: An avoidance groove (252) is arranged at one end of the bottom surface of the spreading blade of the spreading tray (25) close to the stepped shaft (22) to provide a larger distribution space for the quartz sand in the feeding state.

4. A screening device for screening quartz sand according to claim 1, characterized in that: A conical block (3) is arranged 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) towards the direction close to the blanking hole (26).

5. A screening device for screening quartz sand according to claim 1, characterized in that: A sealing ring (4) is sleeved at the connection between the large-diameter shaft body (221) and the spreading tray (25) to seal the gap between the large-diameter shaft body (221) and the spreading tray (25).

6. A screening device for screening quartz sand according to claim 1, characterized in that: The driving member (27) includes a reduction motor (271) arranged inside the screening box (2), and the output shaft of the reduction motor (271) is connected to the small-diameter shaft body (222) through a belt drive.

7. A screening device for screening quartz sand according to claim 1, characterized in that: A plurality of circumferentially and arrayedly distributed rubber tension springs (5) are arranged between the bottom plate body of the base (1) and the outer surface of the screening box (2).

8. A screening method for screening quartz sand, applied to a screening device for screening quartz sand according to claim 3, characterized in that, Including: S1, the servo motor (11) operates to drive the screening box (2) and the screening tray (21) arranged inside it to rotate eccentrically. At the same time, the personnel send the quartz sand into the inner cavity of the large-diameter shaft body (221) through the feed pipe (23). Then, the quartz sand falls on the screening tray (21) through the blanking hole (26) for screening work; S2. Drive the small-diameter shaft body (222) and the large-diameter shaft body (221) to rotate together through the driving member (27), so that the material spreading plate (25) rotates together with the large-diameter shaft body (221), and use the material spreading plate (25) to level the quartz sand on the sieve plate (21) to reduce the stacking thickness of the quartz sand on the sieve plate (21). S3. Under the screening action of the sieve plate (21), the large-particle quartz sand can be discharged from the discharge port on the upper layer of the sieve plate (21), and the small-particle quartz sand will be discharged from the discharge port on the lower layer of the sieve plate (21) after passing through the sieve holes on the sieve plate (21).

9. A screening method for screening quartz sand according to claim 8, characterized in that: In the step S1, when the quartz sand moves towards the centrifugal center of the sieve plate (21) due to the eccentric rotation of the sieve plate (21), the material spreading blades of the material spreading plate (25) can play a certain blocking role on the quartz sand, forcing the quartz sand to move along the material spreading blades of the material spreading plate (25), and reducing the moving speed of the quartz sand on the sieve plate (21) by extending the movement path, thereby reducing the probability that the large-particle quartz sand is discharged together with the small-particle quartz sand.

10. A screening method for screening quartz sand according to claim 8, characterized in that: In the step S2, when there is more quartz sand accumulated on the sieve plate (21), the resistance received by the material spreading plate (25) when leveling the quartz sand will increase accordingly. At this time, the material spreading plate (25) will rotate relative to the large-diameter shaft body (221), so that the material dropping holes (26) on the material spreading plate (25) are misaligned with the material dropping holes (26) on the large-diameter shaft body (221), reducing the speed at which the quartz sand falls on the sieve plate (21) from the material dropping holes (26), and thus reducing the possibility of excessive accumulation of the quartz sand on the sieve plate (21).

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