A constant thickness screen drum with built-in slotted bars

Abstract

The present application relates to a kind of built-in slit grating equal-thickness screening drum screen, belong to material screening technical field, solve the problem of low screening efficiency in prior art.The equal-thickness screening drum screen of the present application, comprising: feed bin, motor, screening assembly and receiving hopper;The feed bin is used to transport material to screening assembly;The motor is provided with two;The screening assembly includes: screen drum, rotating shaft and slit grating;The rotating shaft and screen drum are rotated by two described motor respectively;The slit grating is fixedly arranged at the outside of rotating shaft, and synchronously rotates with rotating shaft;The receiving hopper is arranged below the screening assembly, for receiving screened material.The present application improves the screening efficiency of material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material screening, and in particular to an equal-thickness screening drum screen with a built-in slot grate. BACKGROUND

[0002] Screening is a process of separating loose materials into different size fractions by passing them through a screen deck with openings, and is widely used in the fields of mining, metallurgy, petroleum, chemical industry, building materials, food and environmental protection. In the field of mining engineering, the common material screening equipment is mainly vibration screen, cross screen, swing screen and drum screen. Among them, the drum screen improves the next step of separation by throwing the coarse particles out of the screen body through the continuous rotation of the screen body. When the drum screen is working, the motor is connected with the drum device through the belt to drive the drum device to rotate around its axis. The material is turned over and rolled, and the material is screened out one by one through different mesh screens. The material stuck in the screen hole can also be bounced out to prevent clogging.

[0003] Since there is no complete screening theory and design calculation requirement for the drum screen, the drum screen is mostly processed by the actual needs of production at the beginning of the design, and the diameter of the drum screen and the length of the screen and the rotating speed of the screen drum are designed according to practical experience.

[0004] The existing two types of drum screens are optimized and improved from the aspects of increasing the action time of the material with the screen drum and increasing the lifting angle of the material, but there are still problems.

[0005] In the screening process of the screen fixed spiral blade drum screen, the material is seriously accumulated at the inlet and near the spiral blade, resulting in poor size particle layering effect, small particles (especially easy-to-screen particles with a size of less than 0.75 times the size of the screen hole) being difficult to contact the screen surface, and thus high mismatch rate of small particles; the particle flow rate in the screen drum is slow, and the processing capacity per unit time is small.

[0006] In the screening process of the center shaft rotating guide plate drum screen, the guide plate rotation can strengthen the conveying efficiency of the material and improve the processing capacity of the screen body, but when the guide plate scrapes the material particles, the selectivity is poor, resulting in the size particles being scraped at the same time, which to some extent causes the mixed layering material, hinders the particle (with a size of 1.0-1.5 times the size of the screen hole) and the non-screening particle (with a size of more than 1.5 times the size of the screen hole), and causes the problems of low contact efficiency of small particles with the screen surface and poor overall screening effect.

[0007] In the conventional drum screen screening process, the particle group lifting angle is too small, resulting in low utilization rate of the tangential (perpendicular to the direction of the material flow) screen surface, and the effective contact area is less than 1 / 3 of the drum wall area; the tangential particle size separation effect is poor, and the weak sieve particles have weak sieveability; small particles have a large angle between gravity and the normal line of the sieve hole at the maximum lifting angle, and under the action of gravity, the particle sieveability at this position is weak. When the guide plate scrapes the material, it hinders the mixing of particles and non-sieve particles with easy-to-sieve particles, affecting the screening efficiency of easy-to-sieve particles.

[0008] The material accumulates at the inlet end, and the axial particles cannot be separated, resulting in a long screening time for coarse particles and a high mismatch rate for fine particles. Overall, the existing various types of drum screens at this stage generally have the problem of low screening efficiency, and the specific reason is that the difficult-to-sieve particles (particles with a size of 0.75-1.0 times the size of the sieve hole) have low sieveability, and the barrier particle screen surface occupancy rate is high.

[0009] Therefore, it is necessary to provide a new drum screen structure to improve the screening efficiency and screening quality. SUMMARY

[0010] In view of the above analysis, the present application aims to provide an equal-thickness screening drum screen with a built-in slot grate to solve the problem of low screening efficiency of the existing screening drum.

[0011] The purpose of the present application is mainly realized by the following technical solutions:

[0012] An equal-thickness screening drum screen with a built-in slot grate, comprising: a feeding bin, a motor, a screening assembly, and a material collecting hopper; the feeding bin is used to transport material into the screening assembly; the motor is provided with two; the screening assembly comprises: a screening drum, a rotating shaft, and a slot grate; the rotating shaft and the screening drum are respectively driven to rotate by the two motors; the slot grate is fixedly arranged outside the rotating shaft and rotates synchronously with the rotating shaft; the material collecting hopper is arranged below the screening assembly and is used to receive the screened material.

[0013] Further, the motor comprises: a first motor and a second motor; the first motor drives the screening drum to rotate through a first belt transmission mechanism; the second motor drives the rotating shaft to rotate through a second belt transmission mechanism.

[0014] Further, a plurality of slot grates are uniformly arranged along the circumferential direction of the rotating shaft; and a plurality of slots are uniformly arranged on the slot grates.

[0015] Further, the width of the slot is 1.5-2 times the size of the sieve hole on the screening drum.

[0016] Further, a curved guide plate is arranged at the end of the slot grate, and the curved guide plate is fixedly connected with the slot grate.

[0017] Further, the curved guide plate is in an arc-shaped plate structure.

[0018] Further, the curved guide plate is spaced apart from the screen cylinder by a certain gap.

[0019] Further, the gap is 0.75 times the size of the screen hole.

[0020] Further, a plurality of ring-shaped partition strips are uniformly arranged on the inner wall of the screen cylinder as baffles.

[0021] A screening method, which uses an equal-thickness screening drum screen with a built-in slot grate to screen materials.

[0022] The technical scheme of the present application can at least achieve one of the following effects:

[0023] 1. The equal-thickness screening drum screen with a built-in slot grate of the present application can make large-particle materials rotate along with the slot grate, and small-particle materials leak out of the slots of the slot grate, and then, through the rotary motion of the screen cylinder, the small particles leak out of the screen holes and enter the material collecting hopper.

[0024] 2. The equal-thickness screening drum screen with a built-in slot grate of the present application is provided with a curved guide plate, and the gap between the curved guide plate and the screen cylinder is smaller than the diameter of the screen hole, so that small-particle materials can leak out of the gap for normal screening, and large-particle materials are driven to move by the curved guide plate, thereby increasing the screening efficiency of easy-to-screen particles.

[0025] In the present application, the above technical schemes can be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or be understood through the implementation of the present application. The purposes and other advantages of the present application can be achieved and obtained through the contents specifically indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0027] Figure 1 FIG. 1 is a structural schematic view of an equal-thickness screening drum screen with a built-in slot grate according to Embodiment 1 of the present application;

[0028] Figure 2 FIG. 2 is a structural schematic view of a screen material assembly of the equal-thickness screening drum screen according to Embodiment 1 of the present application;

[0029] Figure 3 FIG. 3 is a structural schematic view of a screen cylinder of the equal-thickness screening drum screen according to Embodiment 1 of the present application;

[0030] FIG. 4 is a structural schematic view of a curved guide plate of the equal-thickness screening drum screen according to Embodiment 1 of the present application;Figure 4 A structure diagram of the built-in member of the equal-thickness screening drum screen of Embodiment 1 of the present application;

[0031] Figure 5 An assembled state diagram of the drum and the built-in member of the equal-thickness screening drum screen of Embodiment 1 of the present application;

[0032] Figure 6 A structure diagram of the screening drum of the equal-thickness screening drum screen of Embodiment 2 of the present application;

[0033] Figure 7 A sectional view diagram of the height-adjustable ring-shaped partition strip of the equal-thickness screening drum screen of Embodiment 2 of the present application;

[0034] Figure 8 A half-sectional effect diagram of the first partition strip ring of the ring-shaped partition strip of Embodiment 2 of the present application;

[0035] Figure 9 A half-sectional effect diagram of the second partition strip ring of the ring-shaped partition strip of Embodiment 2 of the present application;

[0036] Figure 10 A structure diagram of the built-in member with adjustable slit width of Embodiment 3 of the present application;

[0037] Figure 11 A structure diagram of the rotating shaft capable of mounting the adjusting grate of Embodiment 3 of the present application;

[0038] Figure 12 A structure diagram of the adjusting grate of Embodiment 3 of the present application;

[0039] Figure 13 A diagram of the adjusting state of the adjusting grate of Embodiment 3 of the present application;

[0040] Figure 14 A structure diagram of the detachable slit grate of Embodiment 4 of the present application;

[0041] Figure 15 A diagram of the tangential distribution state of mixed particles using the equal-thickness screening drum screen of the present application;

[0042] Figure 16 A diagram of the tangential distribution state of mixed particles using a conventional drum screen;

[0043] Figure 17 A diagram of the relationship between the screening efficiency of the drum screen and the structure of the built-in member.

[0044] Reference numerals:

[0045] 1-Feeding bin; 2-Outer shell; 3-Motor; 4-Belt; 5-Bearing; 6-Frame; 7-Collection hopper; 8-Rotating shaft; 9-Screw cylinder; 10-Circular spacer; 11-Slotted grate; 12-Curved guide plate; 13-Adjusting grate; 14-Adjusting screw sleeve; 15-Slotted connecting rod; 16-First mounting hole; 17-Second mounting hole;

[0046] 801 - Strip groove; 802 - External thread;

[0047] 1001 - First spacer ring; 1002 - Second spacer ring; 1003 - Third spacer ring;

[0048] 1301 - Adjusting teeth; 1302 - Grate base plate. Detailed Implementation

[0049] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0050] Example 1

[0051] A specific embodiment of the present invention, such as Figure 1 As shown, a uniform thickness screening drum screen with a built-in slotted grate is disclosed, comprising: a feed bin 1, a motor 3, a screening assembly, and a receiving hopper 7; the feed bin 1 is used to convey materials into the screening assembly; two motors 3 are provided; the screening assembly includes: a screen cylinder 9, a rotating shaft 8, and a slotted grate 11; the rotating shaft 8 and the screen cylinder 9 are driven to rotate by the two motors 3 respectively; the slotted grate 11 is fixedly installed outside the rotating shaft 8 and rotates synchronously with the rotating shaft 8; the receiving hopper 7 is located below the screening assembly and is used to receive the screened material. The material to be screened is fed into the screen cylinder 9 from the feed bin 1. Due to the rotation of the screen cylinder 9, the material slides along the inner wall (i.e., the screen surface) of the screen cylinder 9. Fine material passes through the screen holes and falls into the receiving hopper 7, while coarse material is discharged from the other end of the screen cylinder 9, realizing the screening and grading of the material.

[0052] Furthermore, the electric motor 3 includes: a first electric motor and a second electric motor.

[0053] The first motor drives the screen cylinder 9 to rotate via the first belt drive mechanism; the second motor drives the rotating shaft 8 to rotate via the second belt drive mechanism.

[0054] Specifically, the screen cylinder 9 is fixedly connected to the outer shell 2, and a first belt drive mechanism is sleeved on the outside of the outer shell 2. The first motor drives the outer shell 2 and the screen cylinder 9 to rotate through the first belt drive mechanism.

[0055] Specifically, the two ends of the rotating shaft 8 are rotatably installed on the frame 6 through bearings 5 and are driven to rotate by a second motor. The second motor drives the rotating shaft 8 to rotate through a second belt transmission mechanism, and in turn drives the slot riffle 11 to rotate.

[0056] In the present application, in view of the problem of back mixing of large particles in the easy-to-screen particle distribution area, a slot riffle 11 is designed on the guide plate with uniformly distributed slots. During the rotation of the slot riffle 11, the slot riffle 11 can scrape off the blocking particles and non-screening particles, reduce their contact with the screen surface, and at the same time reduce the back mixing of the blocking particles and non-screening particles with the screening particles when they return to the easy-to-screen particle distribution area, thereby ensuring the separation of large and small particles and increasing the screening efficiency of the easy-to-screen particles.

[0057] Further, a plurality of slot riddles 11 are uniformly arranged along the circumferential direction of the rotating shaft 8; and the slot riffle 11 is provided with a plurality of uniformly arranged slots.

[0058] Specifically, as shown in Figure 4 , the slot riffle 11 is provided with three slot riddles 11, and the angle between any two adjacent slot riddles 11 is 120°.

[0059] In one specific embodiment of the present application, as shown in Figure 2 , the drum assembly comprises a screen drum 9 and an internal component; the screen drum 9 is provided with screen holes, and when the screen drum 9 rotates, the material will slide relative to the screen drum 9, and the small particle material will be exposed from the screen holes and enter the material collecting hopper 7.

[0060] As shown in Figure 4 , the internal component comprises a rotating shaft 8, a slot riffle 11 and a curved guide plate 12; the internal component is designed to rotate the slot riffle 11 by the rotating shaft 8.

[0061] The slot riffle 11 is formed by arranging uniformly distributed slots on the guide plate.

[0062] Specifically, the width of the slot is 1-2 times the size of the screen hole on the screen drum 9.

[0063] Preferably, the width of the slot is 1.5 times the size of the screen hole on the screen drum 9.

[0064] In the present application, in view of the problems of small particle group lifting angle, poor tangential particle size separation effect and weak screening ability of small particles at the maximum lifting angle, the curved guide plate 12 is provided. When the rotating shaft 8 drives the curved guide plate 12 to rotate, the maximum lifting angle of the particle group is increased through the paving effect of the curved guide plate 12, which can significantly improve the utilization rate of the tangential screen surface; through the selective scraping behavior of the curved guide plate 12, the particles in the fine particle material along the screen drum 9 wall are not uniformly distributed according to the particle size, which realizes the separation of mixed particles according to the particle size in the tangential direction and strengthens the screening ability of the easy-to-screen particles.

[0065] Further, as shown inFigure 4 As shown, the curved guide plate 12 is an arc-shaped plate structure; the curved guide plate 12 is located at the end of the slotted grate 11 and is fixedly connected to the slotted grate 11.

[0066] Specifically, such as Figure 5 As shown, the slotted grate 11 is arranged radially along the screen cylinder 9.

[0067] In one specific embodiment of the present invention, such as Figure 5 As shown, there is a certain gap between the curved guide plate 12 and the screen cylinder 9, and the gap size is 0.75 times the screen hole size.

[0068] In this invention, the large angle between gravity and the normal of the sieve hole is overcome by the squeezing action of the curved guide plate 12 on the small particles, so that the small particles are subjected to force perpendicular to the normal of the sieve hole during the entire lifting process (especially at larger lifting angles), thereby enhancing the particle's ability to pass through the sieve.

[0069] In one specific embodiment of the present invention, such as Figure 3 As shown, multiple circular spacers 10 are evenly arranged on the inner wall of the screen cylinder 9 as baffles. To address the problem of material accumulation at the feed end and the inability to separate axial particles, circular spacers 10 are designed as baffles on the inner side of the screen cylinder 9 to achieve axial equal thickness screening of the material.

[0070] Specifically, the annular spacers 10 are fixedly disposed on the inner side of the sieve cylinder 9 and are evenly distributed along the axial direction of the sieve cylinder 9.

[0071] Furthermore, such as Figure 2 , Figure 5 As shown. The height of the circular spacer 10 is greater than the gap between the slotted grate 11 and the sieve cylinder 9.

[0072] like Figure 3 As shown, the annular spacer 10 is a circular plate; the annular spacer 10 can realize the axial separation of materials, so that the materials are evenly spread in the axial direction of the screen cylinder 9, thereby improving the screening efficiency.

[0073] Specifically, in order to achieve better equal thickness screening of the screening cylinder, the cross-section of the ring-shaped spacer 10 is a right-angled trapezoid, one side of the ring-shaped spacer 10 is an inclined surface, the other side is perpendicular to the inner side of the screen cylinder 9, and the inclined surface of the ring-shaped spacer 10 faces the feed end of the screen cylinder 9.

[0074] Furthermore, the slotted grate 11 and the curved guide plate 12 are provided with clearance openings at the annular spacers 10, allowing the slotted grate 11 to rotate relative to the screen cylinder 9.

[0075] Furthermore, from the feed end to the discharge end of the screen cylinder 9, the height of the annular spacers 10 gradually increases, while the spacing between them gradually decreases. That is, the annular spacers 10 near the feed end of the screen cylinder 9 protrude less from the inner wall of the screen cylinder 9, while the annular spacers 10 near the discharge end protrude more from the inner wall of the screen cylinder 9. This allows the material to quickly reach the discharge end, reducing material accumulation at the feed end and ensuring uniform spreading in the material flow direction, achieving equal-thickness screening and enhancing the utilization rate of the screen surface.

[0076] In this invention, by setting the height variation of the ring-shaped partition 10, when the particle size structure of the material changes due to the screening of fine particles, it is always possible to ensure that the particle group overflows in the axial direction (material flow direction) based on particle size selectivity, so that the mixed particles are separated in the axial direction according to particle size, thereby increasing the contact time between fine particles (especially difficult-to-screen particles) and the screen surface and reducing the screening time of coarse particles.

[0077] During implementation, firstly, the distance between the built-in components and the screen cylinder 9 was adjusted, and then slotted grates 11, circular spacers 10, and curved guide plates 12 were added sequentially to the built-in components; the results showed that the screening efficiency of the drum screen continuously increased, such as... Figure 8 As shown.

[0078] Example 2

[0079] In one specific embodiment of the present invention, based on embodiment 1, the height of the circular spacer 10 is adjustable.

[0080] like Figures 6-9 As shown, the circular spacer 10 is composed of multiple layers of spacer rings. The height of the circular spacer 10 can be changed by increasing or decreasing the number of spacer rings.

[0081] In one specific implementation of this embodiment, such as Figure 7 As shown, the annular spacer 10 includes a first spacer ring 1001, a second spacer ring 1002, and a third spacer ring 1003. The diameters of the first spacer ring 1001, the second spacer ring 1002, and the third spacer ring 1003 decrease sequentially and are interlocked. When the material to be screened is thick, the three spacer rings are joined together. When the material to be screened is thin, the third spacer ring 1003 or the second spacer ring 1002 can be disassembled to adjust the height of the annular spacer 10, thus adapting to the screening of different materials or different screening requirements.

[0082] Specifically, the first spacer ring 1001 is attached to the inner wall of the sieve cylinder 9 and is fixedly connected by adhesive or snap-fit.

[0083] Specifically, such as Figure 7 , Figure 8 , Figure 9As shown, the inner ring of the first partition strip ring 1001 is provided with a first clamping part with a triangular cross section; the outer ring of the second partition strip ring 1002 is provided with a first annular clamping groove with a triangular cross section, and the second partition strip ring 1002 is clamped with the first partition strip ring 1001 as a whole by clamping the first annular clamping groove with the first clamping part.

[0084] Specifically, the cross-sectional shape and size of the first annular clamping groove and the first clamping part are the same. Since the second partition strip ring 1002 and the first partition strip ring 1001 are both annular and clamped with each other, they will not be displaced relative to each other.

[0085] Further, the inner ring of the second partition strip ring 1002 is provided with a second clamping part with a triangular cross section; the outer ring of the third partition strip ring 1003 is provided with a second clamping groove with a triangular cross section; and the third partition strip ring 1003 and the second partition strip ring 1002 are connected as a whole by clamping the second clamping part with the second clamping groove.

[0086] Specifically, the cross-sectional shape and size of the second annular clamping groove and the second clamping part are the same.

[0087] Specifically, the plurality of partition strip rings constituting the ring-shaped partition strip 10 are all of rubber material capable of elastic deformation.

[0088] Embodiment 3

[0089] In one specific embodiment of the present application, the slotted screen 11 is improved on the basis of Embodiment 1 or Embodiment 2, and specifically, the width of the slotted screen 11 is adjustable.

[0090] As shown in the drawings, Figures 10-13 In this embodiment, a plurality of wire grooves 801 are uniformly arranged on the circumferential surface of the rotating shaft 8; the adjusting screen 13 is slidingly installed in the wire groove 801, and by adjusting the sliding of the adjusting screen 13 in the wire groove 801, the slotted screen 11 and the adjusting screen 13 are overlapped or misaligned with each other, and by changing the width of the overlapping part of the slotted screen 11 and the adjusting screen 13, the width of the "slotted" capable of leaking material is adjusted.

[0091] As shown in the drawings, Figure 11 Three wire grooves 801 are arranged on the cylindrical side surface of the rotating shaft 8. The side surface of the wire groove 801 is in contact with the side surface of the slotted screen 11; the adjusting screen 13 is installed in the wire groove 801, and the adjusting screen 13 is in contact with the side surface of the slotted screen 11.

[0092] As shown in the drawings, Figure 12 The shape of the adjusting screen 13 is the same as that of the slotted screen 11.

[0093] Specifically, the adjusting grate 13 includes: adjusting teeth 1301 and a grate base plate 1302; multiple adjusting teeth 1031 are provided and fixed at equal intervals on the grate base plate 1302; the adjusting teeth 1301 are perpendicular to the grate base plate 1302; by adjusting the grate 13 sliding in the groove 801, the adjusting teeth 1301 can block the grooves of the slotted grate 11, and by adjusting the sliding of the grate 13, the width of the blocked part can be changed, thereby changing the width of the material leakage groove of the slotted grate 11.

[0094] Furthermore, the thickness of the grate base plate 1302 is the same as the width of the wire groove 801.

[0095] Furthermore, both ends of the grate base plate 1302 protrude from the adjusting teeth 1301, such as... Figure 12 As shown.

[0096] Furthermore, two sets of external threads 802 are provided on the outer surface of the rotating shaft 8, and the two sets of external threads 802 are located on the outside of the slotted grate 11; the rotating shaft 8 is threadedly coupled to the internal thread of the adjusting sleeve 14 through the external threads 802.

[0097] Specifically, such as Figure 13 As shown, the sides of the two adjusting sleeves 14 respectively abut against the two end faces of the grate base plate 1302. By rotating the adjusting sleeves 14, the adjusting sleeves 14 can be displaced along the axis of the rotation shaft 8. By rotating the two adjusting sleeves 14, the adjusting grate 13 can be pushed to slide left and right in the groove 801.

[0098] When the adjusting grate 13 slides in the groove 801, the adjusting teeth 1301 relative to the slot displacement of the slotted grate 11 achieve partial obstruction of the slots and adjust the width of the slots of the slotted grate 11.

[0099] Furthermore, in order to enhance the installation stability of the adjustable grate 13, a linear groove is provided at the connection between the curved guide plate 12 and the slotted grate 11. The adjusting teeth 1301 at the upper end of the adjustable grate 13 are slidably engaged in the linear groove of the curved guide plate 12, and the grate bottom plate 1302 at the lower end is slidably engaged in the groove 801 of the rotating shaft 8.

[0100] Example 4

[0101] In a specific embodiment of the present invention, an improvement is made based on embodiment 1 or embodiment 2, specifically: the slotted comb 11 is configured as a detachable structure.

[0102] Specifically, three rows of first mounting holes 16 are arranged on the rotating shaft 8, and the first mounting holes 16 in each row are evenly distributed. Correspondingly, the two ends of the curved guide plate 12 are fixedly connected with the rotating shaft 8 through two fixing rods; a plurality of strip gap connecting rods 15 are arranged between the two fixing rods, and the strip gap width of the strip gap grate 11 can be adjusted by adjusting the number and spacing of the strip gap connecting rods 15.

[0103] Correspondingly, second mounting holes 17 corresponding in number and position to the first mounting holes 16 are arranged on the curved guide plate 12, and the two ends of the strip gap connecting rod 15 are clamped in the first mounting hole 16 and the second mounting hole 17.

[0104] Since the first mounting hole 16 and the second mounting hole 17 are arranged in multiple groups to form a row, the strip gap width of the strip gap grate 11 can be adjusted by adjusting the number of strip gap connecting rods 15 and the number of first mounting holes 16 between adjacent two strip gap connecting rods 15.

[0105] Specifically, the three rows of first mounting holes 16 are evenly distributed in the circumferential direction on the rotating shaft 8, and the circumferential offset angle of adjacent two rows is 120°.

[0106] Specifically, as shown in Figure 14 each row of first mounting holes 16 is arranged n*m; the number of strip gap connecting rods 15 is arranged as m, 2m, 3m, 4m…n*m (where n is an integer greater than 1, and m is an integer greater than 10), and the number of strip gap connecting rods 15 is increased or decreased to realize multiple increase or decrease of the strip gap width of the strip gap grate 11.

[0107] Further, the hole diameter of the first mounting hole 16 and the second mounting hole 17 is greater than the diameter of the strip gap connecting rod 15; the strip gap connecting rod 15 can be floatingly displaced in the first mounting hole 16, so that the strip gap width of the strip gap grate 11 can be slightly floating during the screening work, and the condition of the material being stuck in the strip gap is reduced.

[0108] Embodiment 5

[0109] The embodiment provides a screening method, which adopts the equal-thickness screening drum screen with the built-in strip gap grate according to any one of embodiments 1-4 to screen the material; the screening method comprises the following steps:

[0110] Step S1: delivering the material to the inside of the screening assembly through the feeding bin 1;

[0111] Step S2: driving the screen drum 9 and the rotating shaft 8 to rotate through the first motor and the second motor; the rotating shaft drives the strip gap grate 11 and the curved guide plate 12 to rotate;

[0112] Step S3: the material slides along the inner wall of the screen cylinder 9, the material smaller than the screen hole falls into the material collecting hopper through the screen hole, and the material larger than the screen hole is discharged from the other end of the screen cylinder 9, so as to realize the screening and grading of the material.

[0113] In the step S1, the feeding bin 1 is arranged outside the screen cylinder 9 and communicates with one end of the screen cylinder 9. The end of the screen cylinder 9 communicating with the feeding bin 1 is the material inlet end, and the end of the screen cylinder 9 away from the feeding bin 1 is the material outlet end.

[0114] Specifically, in the step S1, the rotation directions of the first motor and the second motor are opposite, that is, the screen cylinder 9 and the built-in component can rotate relatively.

[0115] In the step S2, the annular partition strip 10 is arranged vertically to the inner wall surface of the screen cylinder 9, and the height of the annular partition strip 10 increases from the material inlet end to the material outlet end. The plurality of annular partition strips 10 separate the screen cylinder 9 into a plurality of annular groove spaces with increasing depths. After the material enters the screen cylinder 9, the material gradually overflows from the material inlet end to the material outlet end, and the material spreads in the axial direction of the screen cylinder 9, so as to realize the equal-thickness screening of the material.

[0116] In the screening process of the drum screen, by setting the height and spacing of the annular partition strip 10, the material has a short action time at the material inlet end and a long action time at the material discharge end, so that the material cannot accumulate at the material inlet end, and the equal-thickness distribution is realized.

[0117] In the step S2, the rotating shaft 8 drives the curved guide plate 12 to rotate, so as to realize the paving of the material accumulated at the bottom of the inner wall of the screen cylinder 9 of the drum screen, and make the material spread in a U shape on the annular inner wall of the screen cylinder 9, thereby reducing the material accumulation in the middle part.

[0118] In the step S3, the gap between the curved guide plate 12 and the screen cylinder 9 is smaller than the diameter of the screen hole. When the curved guide plate 12 rotates, part of the material particles are extruded between the curved guide plate 12 and the screen cylinder 9. When the curved guide plate 12 and the screen cylinder 9 rotate relatively, the particles are extruded, so that the particles leak out of the screen hole, and the screening efficiency of the particles is enhanced through the extrusion of the two.

[0119] In the step S3, the rotating shaft 8 drives the slotted grate 11 to rotate, and the slits of the slotted grate 11 are used for vertical separation and pre-classification of the large and small particles in the direction perpendicular to the flow direction.

[0120] As Figure 6As shown, when the slit grate 11 rotates relative to the screen cylinder 9, the slit structure of the slit grate 11 selectively scrapes off the blocking particles and difficult-to-screen particles, and the continuous movement of the slit grate 11 enables the blocking particles to continuously follow the rotational movement of the slit grate 11, so that the difficult-to-screen particles and the easy-to-screen particles gradually leak out of the slit and stop following the movement of the slit grate 11, so that the material particles are divided into an easy-to-screen particle distribution area C, a difficult-to-screen particle distribution area B and a blocking particle distribution area A along the rotation direction, and then the difficult-to-screen particles and the easy-to-screen particles are screened through the screen cylinder 9.

[0121] Specifically, the blocking particles are particles with a diameter greater than the screen hole; the difficult-to-screen particles are particles with a diameter less than the screen hole and greater than 0.6 times the screen hole; and the easy-to-screen particles are particles with a diameter less than 0.6 times the screen hole.

[0122] Compared with the prior art, the technical scheme provided by the embodiment has at least one of the following beneficial effects:

[0123] 1. The equal-thickness screening drum screen of the present application realizes equal-thickness screening with large processing capacity and high screening efficiency by arranging the curved guide plate 12, the ring-shaped partition strip 10 and the slit grate 11, and is suitable for screening of minerals and solid waste.

[0124] 2. The curved guide plate 12 of the present application increases the maximum lifting angle a of the particle group through paving action, significantly improves the utilization rate of the tangential screen surface, and realizes the segregation of mixed particles in the tangential direction according to particle size through selective scraping behavior, as shown in Figure 4 ; through the extrusion action of the curved surface, the angle between the gravity direction and the normal line of the screen hole of the small particles is reduced during the entire lifting process (especially at a larger lifting angle), and the screening ability of the particles at this position is strengthened.

[0125] 3. Compared with the existing screening methods, as shown in Figure 15 , Figure 16 , the slit grate 11 of the present application selectively scrapes off large particles during rotation, and the continuous movement of the guide plate enables the large particles to continuously follow the rotational movement of the guide plate, reduces the back mixing of the large particles with the easy-to-screen particles when they return to the easy-to-screen particle distribution area, significantly reduces the content of large particles in the easy-to-screen particle distribution area, as shown in Figure 17 , and increases the screening efficiency of the easy-to-screen particles.

[0126] 4. The equal-thickness screening drum screen of the present application enables the particle group to pass through based on particle size in the axial direction under the action of the ring-shaped partition strip 10 at different heights, so that the particles are unevenly distributed along the material flow direction, the segregation of mixed particles in the axial direction according to particle size is realized, and the large particles move towards the discharge port and the small particles are retained for screening.

[0127] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An equal thickness screen drum sieve with built-in slatted grates, characterized in that, The utility model relates to a kind of material screening device, including: Feed bin (1), motor (3), screening assembly and receiving hopper (7); The feed bin (1) is used to transport material to screening assembly;The motor (3) includes: first motor and second motor;The screening assembly includes: screen cylinder (9), rotating shaft (8) and slot grate (11);The screen cylinder (9) and rotating shaft (8) are rotated by first motor and second motor respectively;The slot grate (11) is fixedly arranged outside rotating shaft (8), and rotates synchronously with rotating shaft (8);The receiving hopper (7) is arranged below the screening assembly, for receiving screened material; Curved guide plate (12) is arranged at the end of slot grate (11), and curved guide plate (12) is fixedly connected with slot grate (11);Curved guide plate (12) and screen cylinder (9) are left with gap; Multiple ring-shaped partitions (10) are evenly arranged on the inner wall of screen cylinder (9) as baffle;From the material inlet end of screen cylinder (9) to the material outlet end, the height of ring-shaped partition (10) gradually increases; Ring-shaped partition (10) is made of multiple layers of partition ring, and the height of ring-shaped partition (10) can be changed by increasing or decreasing the number of partition rings; Multiple slot grates (11) are evenly arranged along the circumferential direction of rotating shaft (8); Slot grate (11) is provided with multiple slots arranged uniformly; Curved guide plate (12) is arc-shaped plate structure.

2. The equal-thickness sifting drum screen with built-in slat grates according to claim 1, characterized in that The first motor drives screen cylinder (9) to rotate through first belt transmission mechanism;The second motor drives rotating shaft (8) to rotate through second belt transmission mechanism.

3. An equal-thickness sifting drum screen with built-in slat grates according to claim 1 or 2, characterized in that The size of gap is 0.75 times of the diameter of screen hole.

4. The equal-thickness sifting drum screen with built-in slat grates of claim 1, wherein, The width of slot is 1.5-2 times of the diameter of screen hole on screen cylinder (9).

5. A method of sieving, characterized in that, The material is screened by using the equal-thickness screening drum screen with built-in slot grate according to any one of claims 1-4.

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