Three-stage screening device for material processing

Abstract

The invention relates to the technical field of multi-stage screens, and provides a three-stage screening device for material processing. The first inner-layer sieve plate and the second inner-layer sieve plate are sequentially arranged in the sieving groove from top to bottom, and the sieve seam size of the first inner-layer sieve plate is smaller than that of the second inner-layer sieve plate; the small block discharging hopper is arranged below the screening groove and used for collecting materials screened out by the first inner-layer screening plate, and the medium block discharging hopper is arranged below the screening groove and used for collecting materials screened out by the second inner-layer screening plate. By means of the technical scheme, the problem that in the prior art, two sets of sieves are usually arranged for multi-stage screening, and the occupied space is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-stage screens, and in particular to a three-stage screening device for material processing. Background Art

[0002] In the actual operation process of traditional technology, the material will first enter the first-level screen for preliminary screening. The main function of the first-level screen is to screen out those materials with large particle sizes. This step is like selecting the more conspicuous "large pieces" from a large number of materials, so that subsequent processing can be more refined and efficient. When the first-level screen completes its screening task, its undersize materials, that is, those with relatively small particle sizes, will then be transported to the second-level screen. The mission of the second-level screen is to further accurately separate the intermediate particle sizes from the small particle sizes in these undersize materials, thereby realizing the detailed classification of materials according to particle size.

[0003] However, this traditional process method has obvious defects. Since two sets of sieves, the primary sieve and the secondary sieve, need to be set up separately to complete the entire screening process, this not only increases the purchase cost and maintenance cost of the equipment, but also the space occupied by the entire set of process equipment is very large. In many production workshops, in order to accommodate these two sets of sieves and their supporting facilities, a large area of ​​site needs to be specially opened up, which undoubtedly puts a certain pressure on the effective use of production space. At the same time, it may also increase the cost of factory construction and subsequent operating costs, which to a certain extent limits the improvement of production efficiency and the further development of the enterprise. Secondly, the existing screening machine lacks a cleaning mechanism, and generally requires manual cleaning of the sieve plate on a regular basis, which is not only labor-intensive but also inefficient.

[0004] Therefore need to improve existing screening machine, to solve the above problems. Summary of the Invention

[0005] The present invention provides a three-stage screening device for material processing, which solves the problem in the related art that multi-stage screening usually requires two sets of screens, which takes up a lot of space.

[0006] The technical solutions of the present invention are as follows: A three-stage screening device for material processing, comprising: a main body having a screening slot; The inner sieve plate 1 and the inner sieve plate 2 are sequentially arranged in the screening tank from top to bottom, and the sieve slot size of the inner sieve plate 1 is smaller than the sieve slot size of the inner sieve plate 2; A small lump material discharge hopper is provided below the screening trough and is used to collect the material screened by the inner screen plate; The middle block material discharging hopper is arranged below the screening trough and is used to collect the material screened by the second inner screen plate.

[0007] As a further technical solution, the main body has a feed end and a discharge end, the screening trough is located between the feed end and the discharge end, the inner sieve plate 1 is located on one side of the feed end, and the inner sieve plate 2 is located on one side of the discharge end.

[0008] As a further technical solution, it also includes: A feed box, arranged at the feed end; A bulk material discharging hopper is arranged at the discharging end.

[0009] As a further technical solution, it also includes: There are several screen bars, all of which are slidably arranged in the screening groove. The several screen bars are respectively located below the inner screen plate 1 and the inner screen plate 2. After the screen bars slide, they block or open the screen gaps of the inner screen plate 1 and the inner screen plate 2.

[0010] As a further technical solution, it also includes: A mounting plate, arranged on the main body and located above the screening tank, the mounting plate having a slideway; a sliding member, slidably disposed in the slideway; A cleaning mechanism is provided on the sliding member and is used for cleaning the inner sieve plate 1 and the inner sieve plate 2.

[0011] As a further technical solution, the cleaning mechanism includes: a housing rotatably mounted on the mounting plate, wherein the rotation axis of the housing is perpendicular to the sliding direction of the sliding member; a rotating member rotatably disposed on the housing, wherein the rotation axis of the rotating member is parallel to the rotation axis of the housing; A telescopic member 1 is movably arranged in the shell, and the moving direction of the telescopic member 1 is parallel to the rotation axis of the rotating member. The telescopic member 1 has a threaded hole 1, and the rotating member has an external thread 1. The external thread 1 is threadedly arranged with the threaded hole 1.

[0012] As a further technical solution, the shell has an inner slide groove, the telescopic member 1 has an outer convex portion, and the outer convex portion 1 is located in the inner slide groove.

[0013] As a further technical solution, the cleaning mechanism further includes: a first annular limiting member, disposed on the first telescopic member; The first transmission member has an annular groove, and the first transmission member is sleeved on the first annular limiting member through the annular groove, so that the first transmission member moves following the telescopic member. The first transmission member also has an inner groove, and the rotating member has an outer protrusion, and the outer protrusion extends into the inner groove, so that the first transmission member rotates following the rotating member. The telescopic part 2 is movably arranged in the telescopic part 1, and the moving direction of the telescopic part 2 is parallel to the moving direction of the telescopic part 1. The telescopic part 2 has a threaded hole 2, and the transmission part 1 has an external thread 2. The external thread 2 is threadedly arranged with the threaded hole 2.

[0014] As a further technical solution, the cleaning mechanism further includes: a second annular limiting member, provided on the second telescopic member; The second transmission member has a second annular groove, and the second transmission member is sleeved on the second annular limiting member through the second annular groove, so that the second transmission member moves along with the second telescopic member. The second transmission member also has a second inner groove, and the rotating member has a second outer protrusion, and the second outer protrusion extends into the second inner groove, so that the second transmission member rotates along with the first transmission member. The telescopic part three is movably arranged in the telescopic part two, and the moving direction of the telescopic part three is parallel to the moving direction of the telescopic part two. The telescopic part three has a threaded hole three, and the transmission part two has an external thread three. The external thread three is threadedly arranged with the threaded hole three.

[0015] As a further technical solution, the outer wall of the housing is provided with a tooth portion, and the cleaning mechanism further comprises: Gear 1, disposed on the rotating member and located outside the housing; A moving member, movably arranged on the sliding member, wherein the moving direction of the moving member is perpendicular to the sliding direction of the sliding member; Gear 2 is rotatably mounted on the moving member, wherein the rotation axis of the gear 2 is parallel to the moving direction of the moving member, and after the moving member moves, the gear 2 is meshed with the gear 1 or the tooth portion; A guide member is provided on the mounting plate and has an inclined guide surface. The movable member has a rounded end. When the rounded end abuts against the inclined guide surface, the movable member moves, and the gear 2 is engaged with the gear 1. an elastic member, one end of which acts on the moving member and the other end of which acts on the sliding member, for providing a restoring force for the moving member after it is separated from the guide member, so that the gear 2 is engaged with the tooth portion; A driving member is provided on the sliding member and is used for driving the second gear to rotate.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, after the ore raw material enters the screening trough from the feed box, it runs without power under the action of gravity. The ore is first screened on the inclined inner screen plate 1, and small pieces of material fall into the small piece material discharge hopper through the screen gap, while the ore that does not pass continues to slide along the screening trough to the inner screen plate 2 for secondary screening. The medium pieces of material are collected by the medium piece material discharge hopper, and the remaining large pieces of material are finally discharged from the large piece material discharge hopper at the discharge end, completing the entire three-stage screening process. Through the application of this three-stage screening device for material processing, the ore processing factory has effectively improved the screening efficiency and quality of the ore, reduced energy consumption and equipment wear in the subsequent processing process, and brought significant economic and production benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0018] Figure 1 This is a structural diagram of Example 1 of the present invention; Figure 2 This is a partial structural cross-sectional view of Example 1 of the present invention; Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram; Figure 4 This is a structural diagram of embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the structure of the housing from the first perspective in the present invention; Figure 6 This is a schematic diagram of the second viewing angle structure of the housing in the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the housing in the present invention; Figure 8 Schematic diagram of the internal structure of the shell in the present invention; Figure 9 This is a schematic structural diagram of the housing, rotating part and transmission part in the present invention; Figure 10 It is a structural schematic diagram of the rotating part and the transmission part in the present invention; Figure 11 This is a schematic diagram of the cleaning mechanism structure of the present invention; Figure: 1. Main body; 2. Screening trough; 3. Inner sieve plate 1; 4. Inner sieve plate 2; 5. Discharge hopper for small-block material; 6. Discharge hopper for medium-block material; 7. Feed end; 8. Discharge end; 9. Feed box; 10. Discharge hopper for large-block material; 11. Screen bars; 12. Mounting plate; 13. Slideway; 14. Sliding member; 15. Cleaning mechanism; 16. Housing; 17. Rotating member; 18. Telescopic member 1; 19. Threaded hole 1; 20. External thread 1; 21. Inner chute; 22. External protrusion; 23. Annular limit member 1; 24. Transmission member 1; 25 , annular groove one; 26, inner groove one; 27, outer protrusion one; 28, telescopic part two; 29, threaded hole two; 30, outer thread two; 31, annular limiter two; 32, transmission part two; 33, annular groove two; 34, inner groove two; 35, outer protrusion two; 36, telescopic part three; 37, threaded hole three; 38, outer thread three; 39, tooth portion; 40, gear one; 41, moving part; 42, gear two; 43, guide part; 44, inclined guide surface; 45, round head end; 46, elastic part; 47, driving part. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0020] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0021] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0022] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] Example 1 Reference Figure 1-Figure 3 As shown, a three-stage screening device for material processing is proposed, including: a main body 1 with a screening trough 2; an inner sieve plate 1 3 and an inner sieve plate 2 4, which are arranged in sequence from top to bottom in the screening trough 2, and the sieve gap size of the inner sieve plate 1 3 is smaller than the sieve gap size of the inner sieve plate 2 4; a small block material discharge hopper 5 is arranged below the screening trough 2, for collecting the material screened by the inner sieve plate 1 3; a medium block material discharge hopper 6 is arranged below the screening trough 2, for collecting the material screened by the inner sieve plate 2 4.

[0024] The main body 1 has an inlet end 7 and a discharge end 8. The screening trough 2 is located between these two ends. The inner sieve plate 1 3 is located on one side of the inlet end 7, and the inner sieve plate 2 4 is located on the other side of the discharge end 8. An inlet box 9 is located at the inlet end 7; a bulk material discharge hopper 10 is located at the discharge end 8. A plurality of screen bars 11 are slidably mounted within the screening trough 2. These screen bars 11 are located below the inner sieve plate 1 3 and the inner sieve plate 2 4, respectively. When the screen bars 11 slide, they block or open the sieve slots of the inner sieve plate 1 3 and the inner sieve plate 2 4.

[0025] To address the space-consuming problem of using two sets of sieves for multi-stage screening in related technologies, this embodiment utilizes a sieve body with an internal structural design to separate materials into three different sizes at once. The materials then slide down the sieve plates using their own weight or existing vibrators for multi-stage screening. This device occupies a small footprint, is low-cost, and is energy-efficient and environmentally friendly.

[0026] Relying on the material's own weight, this screening device operates without power, consumes no energy, and reduces noise. Furthermore, the curved-top sieve plate design provides a high screening rate and excellent screening results. Material slides across the plate, reducing collision and breakage while increasing the fraction of large pieces. Its excellent integrity, lacking moving parts, creates a very good seal, and eliminates dust spillage during operation, creating a clean environment. Its compact structure and minimal footprint significantly reduce construction costs and improve silo utilization. The wear-resistant ceramic lining extends its service life by more than tenfold.

[0027] Inner sieve plate 1 3 and inner sieve plate 2 4 are selected based on the specific requirements of ore processing. Inner sieve plate 1 3 has a 5mm sieve slot size, primarily used to screen out fine, qualified ore particles. These small pieces are collected by the small piece discharge hopper 5 located below the screening trough 2 and transported via pipelines to a dedicated post-processing area for further purification or production into products of specific specifications. Inner sieve plate 2 4 has a 10mm sieve slot size, intended to screen out medium-sized ore particles. These medium-sized pieces are collected by the medium-sized piece discharge hopper 6 and then sent to another production line for secondary crushing or other processing to meet different production needs.

[0028] In the actual production process, after the ore raw material enters the screening trough 2 from the feed box 9, the ore is first screened on the inclined inner sieve plate 1 3 under the action of gravity. The small blocks pass through the sieve holes and fall into the small block discharge hopper 5, while the ore that does not pass continues to slide down along the screening trough 2 to the inner sieve plate 2 4 for secondary screening. The medium blocks are collected by the medium block discharge hopper 6, and the remaining large blocks are finally discharged from the large block discharge hopper 10 at the discharge end 8, completing the entire three-stage screening process.

[0029] Through the application of this three-stage screening device for material processing, the ore processing plant has effectively improved the screening efficiency and quality of the ore, reduced energy consumption and equipment wear in the subsequent processing process, and brought significant economic and production benefits to the enterprise.

[0030] A further effect is that screen bars 11 are added below the inner sieve plate 1 3 and the inner sieve plate 2 4. The screen bars 11 can move relative to the screening slot 2. After the screen bars 11 move, they can block part of the screen slots, thereby controlling the screened particle size. One possible way to achieve this is that the length direction of the screen bars 11 is the same as the transverse direction of the inner sieve plates 1 3 and 2 4. One screen bar 11 can be moved to adjust the size of a row of screen slots. The screen bars 11 can slide in the longitudinal chute of the inner sieve plates 1 3 and 2 4. After sliding to the specified position, they are fixed by means of clips, bolts, etc.

[0031] Example 2 Reference Figures 4 to 11 Compared with Example 1, it further includes: a mounting plate 12 is arranged on the main body 1, located above the screening slot 2, and a slide 13 is provided on the mounting plate 12; a sliding member 14 is slidably arranged in the slide 13; a cleaning mechanism 15 is arranged on the sliding member 14, for cleaning the inner sieve plate 1 3 and the inner sieve plate 2 4.

[0032] In this embodiment, in order to solve the problem that the existing screening machine lacks a cleaning mechanism 15, which generally requires manual cleaning of the sieve plate regularly, which not only consumes manpower but also has low efficiency, a cleaning mechanism 15 is installed above the screening trough 2. The cleaning mechanism 15 can be started regularly to clean the inner sieve plate 1 3 and the inner sieve plate 2 4, eliminating the need for manual cleaning, saving manpower and improving efficiency.

[0033] Furthermore, the cleaning mechanism 15 includes: a shell 16 rotatably set on the mounting plate 12, and the rotation axis of the shell 16 is perpendicular to the sliding direction of the sliding member 14; a rotating member 17 is rotatably set on the shell 16, and the rotation axis of the rotating member 17 is parallel to the rotation axis of the shell 16; a telescopic member 18 is movably set in the shell 16, and the moving direction of the telescopic member 18 is parallel to the rotation axis of the rotating member 17, the telescopic member 18 has a threaded hole 19, and the rotating member 17 has an external thread 20, and the external thread 20 is threadedly set with the threaded hole 19.

[0034] In order not to affect the loading of the screening device, the parts used for cleaning are designed as a telescopic part. Specifically, in the three-stage screening device for material processing, the shell 16 of the cleaning mechanism 15 is made of a lightweight alloy material and is rotatably mounted on the mounting plate 12 via high-precision bearings to ensure flexible and stable rotation. The rotating part 17 is a metal shaft with an external thread 20 on the surface. It is also mounted on the shell 16 via high-quality bearings to enable it to rotate smoothly. The telescopic part 18 is a columnar structure with a threaded hole 19 machined inside. The material has sufficient strength and wear resistance. The outer protrusion 22 thereof cooperates with the inner groove 21 of the shell 16 with good precision, which can not only ensure the stable movement of the telescopic part 18 in the shell 16, but also perform precise thread transmission along the axial direction of the rotating part 17, thereby realizing telescopic movement.

[0035] Through this structural design, when the rotating part 17 rotates, due to the threaded cooperation between the external thread 20 and the threaded hole 19, the rotation can be converted into a linear telescopic motion of the telescopic part 18, and the rotatable setting of the outer shell 16 allows the cleaning mechanism 15 to rotate as a whole after the telescopic part 18 is extended, ensuring effective cleaning of the screen plate, improving cleaning efficiency and coverage, reducing the situation of material blocking the screen holes, and thus ensuring the continuous and efficient operation of the screening device and reducing equipment maintenance costs and downtime.

[0036] Furthermore, the housing 16 has an inner slide groove 21 , and the telescopic member 18 has an outer protrusion 22 , and the outer protrusion 22 is located in the inner slide groove 21 .

[0037] The inner groove 21 of the housing 16 is precision milled to achieve a smooth surface and high dimensional accuracy, ensuring that the outer protrusion 22 of the telescopic member 18 slides smoothly within it without creating excessive clearance that could cause wobbling. The outer protrusion 22 is quenched to increase its surface hardness and wear resistance, preventing wear during frequent telescopic movements.

[0038] The cooperation between the inner chute 21 and the outer protrusion 22 provides precise guidance and stable support, ensuring that the movement direction of the telescopic member 18 within the housing 16 is always parallel to the rotation axis of the rotating member 17, thus ensuring the precision and reliability of the operation of the cleaning mechanism 15. This helps to improve the stability of the cleaning effect, avoid problems such as inadequate cleaning or damage to the screen plate due to the deviation of the telescopic member 18, extend the service life of the equipment, and improve the reliability and stability of the entire screening device.

[0039] Furthermore, the cleaning mechanism 15 also includes: an annular limit member 23 is arranged on the telescopic member 18; a transmission member 24 has an annular groove 25, and the transmission member 24 is sleeved on the annular limit member 23 through the annular groove 25, so that the transmission member 24 moves with the telescopic member 18, and the transmission member 24 also has an inner groove 26, and the rotating member 17 has an outer protrusion 27, and the outer protrusion 27 extends into the inner groove 26, so that the transmission member 24 rotates with the rotating member 17; a telescopic member 28 is movably arranged in the telescopic member 18, and the moving direction of the telescopic member 28 is parallel to the moving direction of the telescopic member 18, the telescopic member 28 has a threaded hole 29, and the transmission member 24 has an external thread 230, and the external thread 230 is threadedly arranged with the threaded hole 29.

[0040] Considering that the actual width of the screening trough 2 is relatively wide, a single telescopic member occupies a large space, so a second telescopic member 28 is installed in the shell 16 to ensure that the overall length of the telescopic member is sufficient to extend to the other end of the screening trough 2 and cover the entire screening trough 2 in width.

[0041] Annular stopper 1 (23) is a high-strength metal ring securely mounted on the end of telescopic member 18. Its surface is finely polished to ensure a tight fit when the annular groove 1 (25) of transmission member 1 (24) is placed over it, while still allowing for flexible rotation. The inner groove 1 (26) of transmission member 1 (24) and the outer protrusion 1 (27) of rotating member 17 are fitted with a clearance fit, ensuring that the rotating member 17 rotates synchronously with transmission member 1 (24) while preventing excessive frictional resistance from being generated by an overly tight fit. The threaded holes 2 (29) of telescopic member 2 (28) and the outer threads 2 (30) of transmission member 1 (24) are machined to a high-precision level, ensuring that telescopic member 2 (28) accurately achieves telescopic motion when transmission member 1 (24) rotates.

[0042] The threaded engagement of annular stopper 1 23, transmission member 1 24, and telescopic member 2 28 creates a multi-stage telescopic structure, further increasing the flexibility and adaptability of cleaning mechanism 15. The cleaning position and force can be precisely adjusted based on the sieve plate's blockage and material characteristics, effectively removing residual material from the sieve plate. This improves the screening efficiency and material throughput rate of the screening device, reduces sieve plate damage and reduced screening accuracy caused by residual material, and enhances the overall performance and production efficiency of the equipment.

[0043] Furthermore, the cleaning mechanism 15 also includes: an annular limit member 2 31 is arranged on the telescopic member 2 28; the transmission member 2 32 has an annular groove 2 33, and the transmission member 2 32 is sleeved on the annular limit member 2 31 through the annular groove 2 33, so that the transmission member 2 32 moves with the telescopic member 2 28, and the transmission member 2 32 also has an inner groove 2 34, and the rotating member 17 has an outer protrusion 2 35, and the outer protrusion 2 35 extends into the inner groove 2 34, so that the transmission member 2 32 rotates with the transmission member 1 24; the telescopic member 3 36 is movably arranged in the telescopic member 2 28, and the moving direction of the telescopic member 3 36 is parallel to the moving direction of the telescopic member 2 28, the telescopic member 3 36 has a threaded hole 37, and the transmission member 2 32 has an external thread 38, and the external thread 38 is threadedly arranged with the threaded hole 37.

[0044] Consistent with the principles of telescopic member 28, the three-stage telescopic and transmission structure further refines the action of cleaning mechanism 15, enabling more precise cleaning of varying degrees of screen plate blockage and complex material residue situations. Compared to simpler cleaning mechanisms, it provides a deeper and more comprehensive cleaning of the screen plate, significantly improving the cleanliness of the screen plate and the operating stability of the screening device, reducing the impact of material residue on subsequent screening processes, improving product quality and production efficiency, and reducing the frequency and workload of manual cleaning.

[0045] Furthermore, the outer wall of the housing 16 has a tooth portion 39, and the cleaning mechanism 15 also includes: a gear 40 is provided on the rotating member 17 and is located outside the housing 16; a moving member 41 is movably provided on the sliding member 14, and the moving direction of the moving member 41 is perpendicular to the sliding direction of the sliding member 14; a gear 2 42 is rotatably provided on the moving member 41, and the rotation axis of the gear 2 42 is parallel to the moving direction of the moving member 41. After the moving member 41 moves, the gear 2 42 engages with the gear 1 40 or the tooth portion 39; a guide member 43 is set on the mounting plate 12 and has an inclined guide surface 44. The moving member 41 has a round head end 45. After the round head end 45 abuts against the inclined guide surface 44, the moving member 41 moves, and the gear 2 42 engages with the gear 1 40; one end of the elastic member 46 acts on the moving member 41, and the other end acts on the sliding member 14, which is used to provide a reset force after the moving member 41 disengages from the guide member 43, so that the gear 2 42 engages with the tooth portion 39; the driving member 47 is set on the sliding member 14, and is used to drive the gear 2 42 to rotate.

[0046] When cleaning, it is necessary to first drive the rotating part 17 to rotate and extend all the telescopic parts. After extending, it is necessary to drive the shell 16 to drive the whole to rotate and clean the screen plate. For this purpose, a driving mechanism is designed. A driving part 47 can be used to switch the driving rotating part 17 and the shell 16. The structure is simple and clever, and the cost is reduced.

[0047] Specifically, when the rotating member 17 needs to be rotated to unfold the telescopic member, the round head end 45 of the moving member 41 abuts against the inclined guide surface 44 of the guide member 43, so that the gear 2 42 on the moving member 41 engages with the gear 1 40 on the rotating member 17. The driving member 47 can use a dual-axis motor, and the output end on one side drives the gear 2 42 to rotate through the gear, and then drives the rotating member 17 to rotate through the transmission of gear 1 40, so that the telescopic member is unfolded.

[0048] When the telescopic member is fully unfolded, the sliding member 14 slides, carrying the moving member 41 out of the guide member 43. The moving member 41 is displaced under the action of the elastic member 46, so that the gear 2 42 is disengaged from the gear 1 40 and engages with the tooth portion 39 of the outer shell 16. At this time, the output end on the other side of the dual-axis motor drives the gear 2 42 to rotate through the gear, and then drives the outer shell 16 and the whole to rotate through the transmission of the tooth portion 39, thereby cleaning the screen plate.

[0049] It should be noted that a brush for cleaning can be installed on the last telescopic member, i.e., the telescopic member 3 36 , and a gap for accommodating the brush can be reserved between the telescopic member 28 and the telescopic member 3 36 .

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A three-stage screening device for material processing, characterized in that: include: A main body (1) having a screening slot (2); The inner sieve plate 1 (3) and the inner sieve plate 2 (4) are sequentially arranged in the screening tank (2) from top to bottom, and the sieve slot size of the inner sieve plate 1 (3) is smaller than the sieve slot size of the inner sieve plate 2 (4); A small lump material discharge hopper (5) is provided below the screening trough (2) and is used to collect the material screened out by the inner screen plate 1 (3); The middle block material discharge hopper (6) is arranged below the screening trough (2) and is used to collect the material screened out by the second inner screen plate (4).

2. A three-stage screening device for material processing according to claim 1, characterized in that: The main body (1) has an inlet end (7) and an outlet end (8), the screening trough (2) is located between the inlet end (7) and the outlet end (8), the inner sieve plate 1 (3) is located on one side of the inlet end (7), and the inner sieve plate 2 (4) is located on one side of the outlet end (8).

3. A three-stage screening device for material processing according to claim 2, characterized in that: Also includes: A feed box (9) is provided at the feed end (7); A bulk material discharge hopper (10) is provided at the discharge end (8).

4. A three-stage screening device for material processing according to claim 1, characterized in that: Also includes: There are a plurality of screen bars (11), all of which are slidably arranged in the screening groove (2), and the plurality of screen bars (11) are respectively located below the inner screen plate 1 (3) and the inner screen plate 2 (4). After the screen bars (11) slide, they block or open the screen slots of the inner screen plate 1 (3) and the screen slots of the inner screen plate 2 (4).

5. The three-stage screening device for material processing according to claim 1, characterized in that: Also includes: A mounting plate (12) is provided on the main body (1) and is located above the screening tank (2); the mounting plate (12) has a slideway (13); A sliding member (14) slidably disposed in the slideway (13); A cleaning mechanism (15) is provided on the sliding member (14) and is used for cleaning the inner sieve plate 1 (3) and the inner sieve plate 2 (4).

6. A three-stage screening device for material processing according to claim 5, characterized in that: The cleaning mechanism (15) comprises: A housing (16) is rotatably mounted on the mounting plate (12), wherein the rotation axis of the housing (16) is perpendicular to the sliding direction of the sliding member (14); a rotating member (17) rotatably disposed on the housing (16), wherein the rotation axis of the rotating member (17) is parallel to the rotation axis of the housing (16); A telescopic member (18) is movably arranged in the housing (16), and the moving direction of the telescopic member (18) is parallel to the rotation axis of the rotating member (17). The telescopic member (18) has a threaded hole (19), and the rotating member (17) has an external thread (20). The external thread (20) is threadedly arranged with the threaded hole (19).

7. A three-stage screening device for material processing according to claim 6, characterized in that: The housing (16) has an inner slide groove (21), and the telescopic member (18) has an outer protrusion (22), and the outer protrusion (22) is located in the inner slide groove (21).

8. The three-stage screening device for material processing according to claim 6, characterized in that: The cleaning mechanism (15) further comprises: An annular limiting member (23) is provided on the telescopic member (18); A transmission member (24) has an annular groove (25), and the transmission member (24) is sleeved on the annular limiting member (23) through the annular groove (25), so that the transmission member (24) moves following the telescopic member (18), and the transmission member (24) also has an inner groove (26), and the rotating member (17) has an outer protrusion (27), and the outer protrusion (27) extends into the inner groove (26), so that the transmission member (24) rotates following the rotating member (17); The second telescopic member (28) is movably arranged in the first telescopic member (18), and the moving direction of the second telescopic member (28) is parallel to the moving direction of the first telescopic member (18). The second telescopic member (28) has a second threaded hole (29), and the first transmission member (24) has a second external thread (30). The second external thread (30) is threadedly arranged with the second threaded hole (29).

9. A three-stage screening device for material processing according to claim 8, characterized in that: The cleaning mechanism (15) further comprises: A second annular limiting member (31) is provided on the second telescopic member (28); The second transmission member (32) has a second annular groove (33), and the second transmission member (32) is sleeved on the second annular limiting member (31) through the second annular groove (33), so that the second transmission member (32) moves following the second telescopic member (28), and the second transmission member (32) also has a second inner groove (34), and the rotating member (17) has a second outer protrusion (35), and the second outer protrusion (35) extends into the second inner groove (34), so that the second transmission member (32) rotates following the first transmission member (24); The telescopic member three (36) is movably arranged in the telescopic member two (28), and the moving direction of the telescopic member three (36) is parallel to the moving direction of the telescopic member two (28). The telescopic member three (36) has a threaded hole three (37), and the transmission member two (32) has an external thread three (38). The external thread three (38) is threadedly arranged with the threaded hole three (37).

10. The three-stage screening device for material processing according to claim 6, characterized in that: The outer wall of the housing (16) is provided with a tooth portion (39), and the cleaning mechanism (15) further comprises: Gear 1 (40), disposed on the rotating member (17) and located outside the housing (16); A moving member (41) is movably arranged on the sliding member (14), and the moving direction of the moving member (41) is perpendicular to the sliding direction of the sliding member (14); Gear 2 (42) is rotatably mounted on the moving member (41), wherein the rotation axis of the gear 2 (42) is parallel to the moving direction of the moving member (41), and after the moving member (41) moves, the gear 2 (42) meshes with the gear 1 (40) or the tooth portion (39); The guide member (43) is provided on the mounting plate (12) and has an inclined guide surface (44). The movable member (41) has a round head end (45). When the round head end (45) abuts against the inclined guide surface (44), the movable member (41) moves, and the gear 2 (42) meshes with the gear 1 (40). an elastic member (46), one end of which acts on the moving member (41) and the other end of which acts on the sliding member (14), for providing a restoring force after the moving member (41) is separated from the guide member (43), so that the second gear (42) meshes with the tooth portion (39); A driving member (47) is provided on the sliding member (14) and is used to drive the second gear (42) to rotate.

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