Roller mill screening system and process

Abstract

This invention relates to the field of mineral processing technology, and provides a roller mill screening system and process, comprising a roller mill with a feed inlet and a discharge outlet; a housing located at the bottom of the roller mill, with an undersize material outlet at the bottom of the housing; a screen cylinder inclinedly disposed within the housing, with a material inlet at the high end of the screen cylinder communicating with the discharge outlet to allow material falling from the roller mill to enter the screen cylinder, and an oversize material outlet at the low end of the screen cylinder; a rotating shaft rotatably disposed within the housing, coaxially with the screen cylinder, and equipped with several radially extending dispersing rods, one end of which can fit against the inner wall of the screen cylinder, for dispersing the material cake within the screen cylinder. This invention solves the technical problem in the prior art where the material cake crushing device is repeatedly damaged by impact with uncrushed stone.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically to a roller mill screening system and process. Background Technology

[0002] A roller mill screening system is a mineral processing system consisting of a high-pressure roller mill and a screening device. During the mineral processing, pre-treated minerals enter the roller mill and are squeezed by the pressure rollers, causing internal crushing of the ore. After being squeezed by the high-pressure roller mill, the material may not be completely crushed due to uneven feeding or the presence of large stones. Therefore, it needs to pass through the screening device again to screen the material. Minerals that do not meet the particle size requirements are fed back to the feed inlet of the high-pressure roller mill for further crushing.

[0003] Currently, roller screens or linear vibrating screens are commonly used to screen materials crushed by roller mills. However, in actual use, due to the presence of moisture in some minerals, they tend to stick together to form a cake after being processed by roller mills. This cake is easily screened into minerals with inconsistent particle sizes. Re-introducing it into the roller mill not only increases the burden on the roller mill, but the cake also tends to stick together with other minerals to form an even larger cake.

[0004] In existing technologies, a dispersing device is often used to disperse the material cake. One common method is to add a mixing box at the outlet of the roller mill. The mixing box contains a rotating stirring rod, which disperses the material cake by rotating. The dispersed material can fall through an arc-shaped screen. However, the above method does not have the function of discharging the material on the screen. If the material is not crushed due to uneven feeding or the presence of large stones, the uncrushed stones will not only accumulate above the screen, but the repeated collision between the stirring rod and the stones will also reduce the service life of the stirring rod. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a roller mill screening system and process, which solves the technical problem of damage caused by repeated impacts between the cake crushing device and the uncrushed stone material in the prior art.

[0006] A roller mill screening system includes:

[0007] The box body has an outlet for under-screened materials at its bottom;

[0008] A roller mill is disposed above the housing, and the roller mill has a feed inlet and a discharge outlet communicating with the housing;

[0009] A screen cylinder is inclinedly disposed inside the box. The high end of the screen cylinder has a material inlet that communicates with the discharge port. The screen cylinder is used to receive the material falling from the roller mill. The low end of the screen cylinder has an outlet for the material on the screen.

[0010] A rotating shaft is rotatably disposed inside the box and coaxially disposed with the screen cylinder. A plurality of dispersing rods extending to the inner wall of the screen cylinder are disposed on the outer periphery of the rotating shaft. The dispersing rods are used to disperse the material cake inside the screen cylinder.

[0011] As a further technical solution, it also includes:

[0012] A plurality of reciprocating sliding rings are slidably disposed on the rotating shaft and spaced apart along the axial direction of the rotating shaft. The reciprocating sliding rings can slide back and forth along the axial direction of the rotating shaft. A plurality of dispersing rods are disposed one-to-one on the plurality of reciprocating sliding rings. The reciprocating sliding rings can drive the dispersing rods to slide back and forth along the axial direction of the rotating shaft.

[0013] As a further technical solution, the screen cylinder includes a sliding section and a screening section connected to the discharge end of the sliding section. The material inlet is located in the sliding section. The peripheral wall of the screening section has a plurality of screen holes for screening materials, and a plurality of the dispersing rods are located inside the screening section. The inner wall of the sliding section is a smooth plane, which allows the material falling from the discharge port to slide into the screening section under the action of gravity.

[0014] As a further technical solution, it also includes:

[0015] A fixed sleeve is disposed inside the screen cylinder. The reciprocating sliding ring and the rotating shaft are both located inside the fixed sleeve. The peripheral wall of the fixed sleeve has several circumferentially closed guide grooves. The number of guide grooves is the same as the number of reciprocating sliding rings, and they are arranged in a one-to-one correspondence.

[0016] A guide post is connected to the outer periphery of the reciprocating sliding ring and extends through the guide groove. When the guide post rotates with the reciprocating sliding ring, it can slide axially along the rotation axis under the action of the guide groove and provide the force for the reciprocating sliding ring to slide.

[0017] As a further technical solution, the guide groove includes a forward section and a backward section connected end to end. The forward section is located below the backward section. When the guide post is located in the forward section, the guide post can move away from the material inlet under the rotation of the reciprocating sliding ring. When the guide post is located in the backward section, the guide post can move closer to the material inlet under the rotation of the reciprocating sliding ring.

[0018] As a further technical solution, the disintegration rod includes:

[0019] The connecting part is provided through the guide groove, and one end is connected to the reciprocating sliding ring;

[0020] A dispersing part is rotatably disposed at the other end of the connecting part. The rotation axis of the dispersing part is parallel to the axis of the sieve cylinder. When the dispersing part rotates relative to the connecting part, the outer end of the dispersing part can contact the inner wall of the sieve cylinder.

[0021] An elastic element is sleeved on the rotating shaft of the dispersing part, and its two ends act on the dispersing part and the connecting part respectively. The elastic element is used to provide a force for the dispersing part to rotate closer to the inner wall of the screen cylinder.

[0022] As a further technical solution, the end of the dispersing part away from the connecting part is in the shape of an inclined plate, and the dispersing part can push the material at the bottom of the screen cylinder to the screen material outlet along the axial direction of the screen cylinder.

[0023] As a further technical solution, the inner wall of the reciprocating sliding ring has several axial ventilation holes, and the housing is provided with an air inlet for connecting to a compressor. The air inlet communicates with the gap between the fixed sleeve and the rotating shaft, so that the gap between the fixed sleeve and the rotating shaft forms a positive pressure environment.

[0024] As a further technical solution, it also includes:

[0025] A cleaning component is rotatably disposed within the housing and located below the roller mill. The cleaning component has bristles extending outwards, which are used to remove residual ore from the roller shaft of the roller mill.

[0026] A roller mill screening process, utilizing the roller mill screening system for screening mineral materials, includes:

[0027] S10: After coarse crushing, the raw ore is transferred to the medium crushing workshop for medium crushing and screening to obtain medium crushed ore and fine crushed ore. The medium crushed ore is then finely crushed and screened again until fine crushed ore is obtained.

[0028] S20 involves dry screening of finely crushed ore to obtain concentrate and waste rock;

[0029] S30, the concentrate is subjected to roller mill screening. The ore that does not meet the particle size requirements after screening is subjected to roller mill screening again until fine ore is obtained.

[0030] S40 involves grinding and separating fine mineral materials to obtain concentrate powder.

[0031] The beneficial effects of this invention are as follows:

[0032] In this invention, a rotating shaft and a dispersing rod, coaxially rotating within the screen cylinder, are installed inside the screen cylinder. The rotating shaft drives the dispersing rod to rotate, thus dispersing the material cake inside the screen cylinder. This effectively prevents the material cake from being mistakenly screened as unqualified mineral material, ensuring that only materials that truly do not meet the particle size requirements are discharged for re-grinding, thereby improving the accuracy of screening. The screen cylinder is inclined and divided into a sliding section and a screening section. The smooth inner wall of the sliding section facilitates the downward movement of materials, while the screen holes in the screening section can accurately screen out materials that meet the particle size requirements, allowing them to pass through the screen holes and be discharged from the undersize material outlet. Unqualified materials are discharged from the oversize material outlet, effectively achieving graded screening of materials. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0036] Figure 3 This is a schematic diagram of the overall structure of the present invention from another angle;

[0037] Figure 4 This is a schematic cross-sectional view of the present invention;

[0038] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0039] Figure 6 This is a schematic diagram of the hidden roller mill and the rear structure of the housing in this invention;

[0040] Figure 7 This is a schematic diagram of the internal structure of the sieve cylinder;

[0041] Figure 8 This is a schematic diagram of the overall structure of the fixing sleeve;

[0042] Figure 9 A schematic diagram of a rotating shaft and a reciprocating sliding sleeve;

[0043] Figure 10 This is a schematic diagram of the overall structure of the disintegration rod;

[0044] Figure 11 This is a top view of the structure of the disintegration rod;

[0045] Figure 12 This is a flowchart of the overall process of roller mill screening;

[0046] Figure 13 This is a schematic diagram of the overall process of the roller mill screening system;

[0047] In the diagram: 100, roller mill; 110, feed inlet; 120, discharge outlet; 200, housing; 210, undersize material outlet; 300, screen cylinder; 311, material inlet; 312, oversize material outlet; 400, rotating shaft; 500, dispersing rod; 600, reciprocating sliding ring; 320, material sliding section; 330, screening section; 340, screen hole; 700, fixed sleeve; 710, guide groove; 610, guide column; 711, forward section; 712, backward section; 510, connecting part; 520, dispersing part; 530, elastic element; 620, axial ventilation port; 130, air inlet; 800, cleaning part. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0049] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0050] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0053] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] like Figures 1-7 The diagram illustrates a roller mill screening system according to an embodiment of the present invention, including a roller mill 100, a housing 200, a screen cylinder 300, a rotating shaft 400, and a dispersing rod 500. The roller mill 100 typically consists of a machine body, a drive unit, pressure rollers, and other main components. The feed inlet 110 is located at the upper part of the machine body to ensure that the raw ore can smoothly enter the roller mill 100. The discharge outlet 120 is located on one side of the lower part of the machine body and connects to subsequent processing equipment. The specific structure of the roller mill 100 can be achieved using existing technology and will not be described in detail here.

[0055] The housing 200 is welded from steel plates, possessing sufficient strength and sealing performance, and is sealed to the bottom of the roller mill 100 to prevent material leakage. The bottom of the housing 200 has an undersize material outlet 210, which can be connected to a conveying pipe or chute to transport materials meeting the particle size requirements to the next process. The interior of the housing 200 is smoothed to reduce material adhesion and accumulation within it.

[0056] The screen cylinder 300 is made of metal to accommodate the abrasion of the ore. The screen cylinder 300 includes a sliding section 320 and a screening section 330, which can be welded or bolted together. The inner wall of the sliding section 320 is polished to form a smooth surface, facilitating rapid material descent. The screen holes 340 of the screening section 330 are machined according to the required particle size, and can be formed by punching, drilling, or weaving. The screen cylinder 300 is installed at an angle inside the housing 200 via a bracket or bearings. Its inclination angle can be adjusted according to the material characteristics and screening efficiency, generally between 15° and 30°.

[0057] The inclined design of the screen cylinder 300 allows the material to move towards the oversize material outlet 312 under the influence of gravity after entering the screen cylinder 300. In particular, the smooth treatment of the inner wall of the sliding section 320 prevents material accumulation in the sliding section 320. The screen apertures 340 of the screening section 330 can accurately screen out materials that meet the particle size requirements, allowing the qualified materials to pass through the screen apertures 340 into the space between the housing 200 and the screen cylinder 300 and exit from the undersize material outlet 210. The oversize material outlet 312 discharges unqualified materials, effectively achieving material grading and screening.

[0058] The rotating shaft 400 is made of metal and is mounted on the housing 200 via bearings at both ends to ensure smooth rotation. One end of the rotating shaft 400 extends through the housing 200 and is connected to the rotation drive device, enabling it to drive the rotating shaft 400 to rotate. The number of dispersing rods 500 is determined according to the size and processing capacity of the screen cylinder 300, and they are evenly distributed along the axial direction of the rotating shaft 400. One end of each dispersing rod 500 can be welded or bolted to the rotating shaft 400, while the other end is arc-shaped to fit against the inner wall of the screen cylinder 300. The rotating shaft 400 drives the dispersing rods 500 to rotate, dispersing the material cake inside the screen cylinder 300, preventing the material cake from being mistakenly screened as unqualified minerals, improving the accuracy of screening, and ensuring that only materials that truly do not meet the particle size requirements are discharged for re-grinding.

[0059] Furthermore, to enhance the dispersing effect of the dispersing rod 500 and the material flowability within the screening section 330, a reciprocating sliding ring 600 is also included. The reciprocating sliding ring 600 is made of metal, and its inner diameter is tightly fitted to the rotating shaft 400 while ensuring free axial sliding. Multiple reciprocating sliding rings 600 are evenly distributed along the axial direction of the rotating shaft 400 and connected to the rotating shaft 400 via keys or splines, ensuring synchronous rotation during rotation while simultaneously allowing relative sliding along the axial direction of the rotating shaft 400.

[0060] The reciprocating sliding ring 600 drives the dispersing rod 500 to slide axially back and forth along the rotating shaft 400. On the one hand, this expands the range of action of the dispersing rod 500, enhances the dispersing effect on the material cake, and allows the material cake to be more fully dispersed, reducing mis-screening caused by the presence of material cake. On the other hand, it can apply an axial thrust to the lumpy material stuck in the screen hole 340, which is conducive to the material leaving the screen hole 340.

[0061] Furthermore, such as Figures 7-9 As shown, the reciprocating sliding of the reciprocating sliding ring 600 is specifically implemented by including a fixed sleeve 700 and a guide post 610. The fixed sleeve 700 is also made of metal and is fixed inside the screen cylinder 300 by welding or bolting with a support rod. To avoid affecting the movement of the material at the bottom of the screen cylinder 300, the fixed sleeve 700 can be suspended from the top of the screen cylinder 300. The guide groove 710 is made on the fixed sleeve 700 by milling or EDM, and its axial width matches that of the guide post 610. The guide groove 710 radially penetrates the fixed sleeve 700 and is arranged around the circumference. The guide groove 710 divides the fixed sleeve 700 into several segments, and each segment of the fixed sleeve 700 is independently fixedly connected to the screen cylinder 300. The guide groove 710 is a circumferential curve, which allows the guide post 610 to slide axially back and forth under the constraint of the guide groove 710 while rotating. The guide post 610 is made of cylindrical pin or bolt, with one end fixed to the reciprocating sliding ring 600 and the other end inserted into the guide groove 710. This allows the guide groove 710 to push the guide post 610 to transmit the axial sliding force to the reciprocating sliding ring 600, so that the reciprocating sliding ring 600 can slide axially while rotating.

[0062] The cooperation between the fixed sleeve 700 and the guide column 610 utilizes the rotational motion of the rotating shaft 400 to convert it into the axial reciprocating motion of the reciprocating sliding ring 600. No additional power unit is required, resulting in a simple structure and high reliability. This method allows the dispersing rod 500 to reciprocate axially within the screen cylinder 300, more thoroughly dispersing the material cake. Simultaneously, the dispersing rod 500 provides axial thrust to the lumpy material stuck in the screen cylinder 300, making it easier for the lumpy material to detach from the screen holes 340.

[0063] See in some examples Figure 10 , Figure 11The dispersing rod 500 consists of a connecting part 510, a dispersing part 520, and an elastic element 530. The connecting part 510 is a metal rod, one end of which is connected to the guide post 610 on the reciprocating sliding ring 600 by a threaded connection, and the other end is rotatably connected to the dispersing part 520 by a pin or bearing. The elastic element 530 can be a torsion spring, which is sleeved on the rotating shaft of the dispersing part 520, and its two ends are fixed to the dispersing part 520 and the connecting part 510 respectively by a nut or a retaining ring. The end of the dispersing part 520 away from the connecting part 510 is processed into an inclined plate shape, which is inclined along the axis of the screen cylinder 300, so that after the dispersing part 520 moves to the bottom of the screen, it can give the material a force to move towards the material outlet 312 on the screen, thus preventing the material from accumulating inside the screen.

[0064] Preferably, to enhance the dispersing effect of the dispersing rod 500, the connecting part 510 is provided with a connecting rod parallel to the axial direction of the screen cylinder 300 in a direction away from the reciprocating sliding ring 600. Several spaced-apart dispersing parts 520 are connected to the connecting rod, thereby increasing the dispersing area. Furthermore, the guide posts 610 on adjacent reciprocating sliding rings 600 have an included angle in their cross-section along the axial direction of the screen cylinder 300, which further enhances the dispersing effect.

[0065] This structure of the dispersing rod 500 allows the dispersing section 520 to rotate under the action of the elastic element 530 when encountering significant resistance, avoiding hard collisions with unbroken stones and effectively protecting the dispersing rod 500. Simultaneously, the inclined plate-shaped dispersing section 520, during the dispersing process, can also push the material at the bottom of the screen cylinder 300 towards the oversize material outlet 312, preventing material accumulation within the screen cylinder 300 and further improving screening efficiency.

[0066] Furthermore, to facilitate the dispersing unit 520 in pushing the material at the bottom of the screen, the guide groove 710 is divided into a forward section 711 and a backward section 712, which are connected end-to-end. The forward section 711 refers to the guide column 610 gradually moving towards the end closer to the material outlet 312 as it rotates after entering the forward section 711. The backward section 712 is where the guide column 610 gradually moves away from the material outlet 312 as it rotates after entering the backward section 712. Specifically, the guide groove 710 is positioned such that the backward section 712 is located above the forward section 711. This arrangement ensures that the dispersing unit 520 always moves towards the material outlet 312 when it reaches the lower half of the screen, thus effectively propelling the material.

[0067] See in some examples Figure 2 , Figure 9A through-hole is provided on the reciprocating sliding ring 600. The ventilation openings are made by drilling or stamping, and their number and size are selected according to the required ventilation volume. An air inlet 130 is also provided at the end of the housing 200 away from the roller mill 100. Specifically, one end of the housing 200 has a mounting hole for fixing the lower end of the screen cylinder 300. A bearing seat for supporting the rotating shaft 400 extends downward from the top of the housing 200. On the side of the bearing seat near the upper end of the screen cylinder 300, a baffle that can block the end face of the fixing sleeve 700 is fitted on the rotating shaft 400, or a baffle is fitted on the outer wall of the bearing. Ventilation holes are provided on the baffle. One end of the ventilation hole is connected to a compressed air fan through a gas pipeline, and the other end is connected to the gap between the fixing sleeve 700 and the rotating shaft 400. When material is introduced into the screen cylinder 300, gas can be introduced between the fixed sleeve 700 and the rotating shaft 400 at the same time, so that the fixed sleeve 700 and the rotating shaft 400 are always in a positive pressure environment. In this way, material can be prevented from entering the sleeve of the rotating shaft 400, thereby affecting the use of the reciprocating sliding sleeve and the rotating shaft 400.

[0068] The positive pressure environment created by the ventilation structure effectively prevents material particles from entering the gap between the fixed sleeve 700 and the rotating shaft 400, avoiding equipment failure caused by material accumulation, ensuring the normal operation of the rotating shaft 400 and the reciprocating sliding ring 600, and extending the service life of the equipment.

[0069] refer to Figure 6 and Figure 7 In some embodiments, a roller mill screening system further includes a cleaning component 800, which may be in the form of a rotary brush or a scraper. If a rotary brush is used, the brush body consists of wear-resistant bristles and a brush shaft, which is mounted on the housing 200 via bearings and rotated by a motor or other drive device. The bristles are in close contact with the roller surface of the roller mill 100, effectively removing residual ore. If a scraper is used, the scraper is generally made of high-strength wear-resistant material and is mounted on the housing 200 via a bracket. The cutting edge of the scraper is in contact with the roller surface, scraping off residual ore as the roller mill 100 rotates.

[0070] The cleaning component 800 can promptly remove residual ore on the roller shaft of the roller mill 100, preventing ore accumulation from affecting the normal operation and crushing effect of the roller mill 100, and ensuring the efficient and stable operation of the roller mill 100.

[0071] Preferably, the number of cleaning components 800 is set to two, with each of the two cleaning components 800 corresponding to one of the two rollers. The two cleaning components 800 rotate in opposite directions and are located at the material inlet 311. The rotation of the two cleaning components 800 can also guide the material, so that the material can fall stably into the bottom of the screen cylinder 300 after falling from the discharge port 120.

[0072] Installation method: During installation, first install the fixing sleeve 700 and the reciprocating sliding ring 600 inside the screen cylinder 300, specifically, as follows: Figure 8 As shown, each segment of the fixing sleeve 700 is sequentially welded to the top of the screen cylinder 300 via a fixing rod at the top. During installation, a reciprocating sliding ring 600 is added between every two segments of the fixing sleeve 700. The outer wall of the reciprocating sliding ring 600 slides against the inner wall of the fixing sleeve 700, and the guide post 610 on the reciprocating sliding ring 600 is clamped between the two fixing sleeves 700, that is, the guide post 610 is located in the guide groove 710. Finally, the rotating shaft 400 is inserted into the reciprocating sliding ring 600 and rotatably connected to the housing 200.

[0073] Working principle: The raw ore enters the roller mill 100 through the feed port 110 at the top of the roller mill 100. Inside the roller mill 100, the pressure roller is driven by the drive device to squeeze and crush the raw ore. The crushed material is discharged from the discharge port 120 on the lower side of the machine body and falls into the screen cylinder 300 inside the box 200 which is sealed to the bottom of the roller mill 100.

[0074] The screen cylinder 300 is installed at an incline inside the housing 200. After the material enters the screen cylinder 300, it first slides rapidly down the sliding section 320 under the action of gravity to prevent the material from accumulating in the sliding section 320. Then the material enters the screening section 330. The material that meets the particle size requirements falls through the screen holes 340 of the screening section 330 into the space between the housing 200 and the screen cylinder 300, and is discharged from the undersize material outlet 210 at the bottom of the housing 200, thus completing the screening of qualified material.

[0075] Meanwhile, the rotating shaft 400 is mounted on the housing 200 via bearings at both ends and is driven to rotate by a rotation drive device, which in turn drives the dispersing rods 500, which are evenly distributed along the axial direction of the rotating shaft 400, to rotate synchronously. The dispersing rods 500 disperse the material cake inside the screen cylinder 300, preventing the material cake from being mis-screened. Furthermore, by setting up a reciprocating sliding ring 600, a fixed sleeve 700, and a guide post 610, the dispersing rods 500 can also slide back and forth along the axial direction of the rotating shaft 400 while rotating, expanding the dispersing range, enhancing the dispersing effect, further reducing mis-screening caused by the material cake, and simultaneously applying axial thrust to the lumpy material stuck in the screen holes 340, making it easier for them to detach from the screen holes 340.

[0076] The dispersing rod 500 adopts a structure consisting of a connecting part 510, a dispersing part 520, and an elastic element 530. When the dispersing part 520 encounters significant resistance (such as unbroken stone), it can rotate under the action of the elastic element 530 to avoid hard collision with the stone and protect the dispersing rod 500. During the dispersing process, the inclined plate-shaped dispersing part 520 can also push the material at the bottom of the screen cylinder 300 towards the oversize material outlet 312, preventing material accumulation inside the screen cylinder 300. Furthermore, the inclined plate-shaped structure can drive the material at the bottom of the screen to move upwards a certain distance along the inside of the screen cylinder 300, creating a lifting effect and preventing the layering of material at the bottom of the screen from affecting the screening effect. In conjunction with the negative pressure adsorption device connected inside the housing 200, any loose material dust can be adsorbed and collected. The retracting section 712 of the guide groove 710 is located above the forward section 711, which makes the dispersing part 520 always move towards the material outlet 312 when it moves to the lower half of the screen, further promoting the material movement.

[0077] An axial ventilation port 620 is provided on the reciprocating sliding ring 600, and an air inlet 130 is provided at one end of the housing 200. The air inlet is connected to the compressed air fan through a gas pipeline, so that a positive pressure environment is formed between the fixed sleeve 700 and the rotating shaft 400 to prevent material particles from entering the gap and avoid the normal operation of the rotating shaft 400 and the reciprocating sliding ring 600 due to material accumulation, thus ensuring the stable operation of the equipment.

[0078] like Figure 12 and Figure 13 As shown, a roller mill screening process utilizes a roller mill screening system for screening mineral materials, including:

[0079] In S10, the raw ore is first coarsely crushed using jaw crushers, cone crushers, and other coarse crushing equipment to break large pieces of ore into a certain particle size range. Then, it is transferred to the intermediate crushing workshop via conveyor belts and other conveying equipment, where it undergoes intermediate crushing using impact crushers, hammer crushers, and other intermediate crushing equipment. The crushed ore is then screened using vibrating screens or circular vibrating screens to separate the intermediate crushed ore from the fine crushed ore. The intermediate crushed ore is then fed into fine crushing equipment, such as cone crushers and sand making machines, for further fine crushing, and then screened again until all the ore is obtained as fine crushed ore.

[0080] The gradual crushing and screening process allows for the selection of appropriate equipment based on the characteristics of the ore at different stages, improving crushing efficiency and ensuring that the ore particle size gradually decreases and becomes uniform, thus providing qualified raw materials for subsequent dry separation and roller mill screening.

[0081] S20 involves feeding finely crushed ore into dry separation equipment, such as magnetic separators and gravity separators, for dry screening. Magnetic separators utilize the differences in magnetic properties between different minerals to separate magnetic and non-magnetic minerals; gravity separators separate minerals based on differences in density. Through the processing of these dry separation devices, the finely crushed ore is separated into concentrate and waste rock.

[0082] Dry screening can initially purify ore, remove most of the waste rock, improve the grade of concentrate, reduce the amount of ineffective processing in subsequent processes, and improve the efficiency of the entire ore processing system. Waste rock can also be further screened into sand making plants and construction ballast, further improving the utilization rate of waste rock.

[0083] S30, the concentrate is subjected to roller mill screening. Through the roller mill screening system of the present invention, the concentrate is fed into the roller mill 100 for further crushing, and then enters the screen cylinder 300 for screening. For the ore material whose particle size does not meet the requirements after screening, it is sent back to the feed port 110 of the roller mill 100 by the conveying equipment for roller mill screening again. The operation is repeated until fine ore material that meets the particle size requirements is obtained.

[0084] S40 involves feeding fine ore into grinding equipment such as ball mills and rod mills for further grinding to refine the ore particles to a size more suitable for beneficiation. Then, based on the properties of the ore, beneficiation processes such as flotation, magnetic separation, and gravity separation are used to separate the valuable minerals, ultimately yielding concentrate powder.

[0085] 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 it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A roller mill screening system, characterized in that, include: The box body (200) has a screened material outlet (210) at the bottom; A roller mill (100) is disposed above the housing (200), the roller mill (100) having a feed inlet (110) and a discharge outlet (120) communicating with the housing. A screen cylinder (300) is inclinedly disposed inside the housing (200). The high end of the screen cylinder (300) has a material inlet (311) communicating with the discharge port (120). The screen cylinder (300) is used to receive the material falling from the roller mill (100). The low end of the screen cylinder (300) has an oversize material outlet (312). A rotating shaft (400) is rotatably disposed inside the housing (200) and coaxially disposed with the screen cylinder (300). A plurality of dispersing rods (500) extending to the inner wall of the screen cylinder (300) are provided on the outer periphery of the rotating shaft (400). The dispersing rods (500) are used to disperse the material cake inside the screen cylinder (300). A plurality of reciprocating sliding rings (600) are slidably disposed on the rotating shaft (400) and spaced apart along the axial direction of the rotating shaft (400). The reciprocating sliding rings (600) are capable of reciprocating along the axial direction of the rotating shaft (400). A plurality of dispersing rods (500) are disposed one-to-one on the plurality of reciprocating sliding rings (600). The reciprocating sliding rings (600) are capable of driving the dispersing rods (500) to reciprocate along the axial direction of the rotating shaft (400). A fixed sleeve (700) is disposed inside the sieve cylinder (300). The reciprocating sliding ring (600) and the rotating shaft (400) are both located inside the fixed sleeve (700). The fixed sleeve (700) has a plurality of circumferentially closed guide grooves (710) on its peripheral wall. The number of guide grooves (710) is the same as the number of reciprocating sliding rings (600), and they are arranged in a one-to-one correspondence. The guide post (610) is connected to the outer periphery of the reciprocating sliding ring (600) and is disposed through the guide groove (710). When the guide post (610) rotates with the reciprocating sliding ring (600), it can slide axially along the rotation axis (400) under the action of the guide groove (710) and provide the force for the reciprocating sliding ring (600) to slide.

2. The roller mill screening system according to claim 1, characterized in that, The screen cylinder (300) includes a sliding section (320) and a screening section (330) connected to the discharge end of the sliding section (320). The material inlet (311) is located in the sliding section (320). The screening section (330) has a plurality of screen holes (340) for screening materials on its peripheral wall. A plurality of the dispersing rods (500) are located in the screening section (330). The inner wall of the sliding section (320) is a smooth plane, which allows the material falling from the discharge port (120) to slide into the screening section (330) under the action of gravity.

3. The roller mill screening system according to claim 1, characterized in that, The guide groove (710) includes a forward section (711) and a backward section (712) connected end to end. The forward section (711) is located below the backward section (712). When the guide post (610) is located in the forward section (711), the guide post (610) can move away from the material inlet (311) under the rotation of the reciprocating sliding ring (600). When the guide post (610) is located in the backward section (712), the guide post (610) can move closer to the material inlet (311) under the rotation of the reciprocating sliding ring (600).

4. The roller mill screening system according to claim 3, characterized in that, The disintegrating lever (500) includes: The connecting part (510) is provided through the guide groove (710), and one end is connected to the reciprocating sliding ring (600); The dispersing part (520) is rotatably disposed at the other end of the connecting part (510). The rotation axis (400) of the dispersing part (520) is parallel to the axis of the sieve cylinder (300). When the dispersing part (520) rotates relative to the connecting part (510), the outer end of the dispersing part (520) can contact the inner wall of the sieve cylinder (300). An elastic element (530) is sleeved on the rotating shaft of the dispersing part (520), and its two ends act on the dispersing part (520) and the connecting part (510) respectively. The elastic element (530) is used to provide the force for the dispersing part (520) to rotate close to the inner wall of the screen cylinder (300).

5. A roller mill screening system according to claim 4, characterized in that, The end of the dispersing part (520) away from the connecting part (510) is an inclined plate. The dispersing part (520) can push the material at the bottom of the screen cylinder (300) along the axial direction of the screen cylinder (300) towards the screen material outlet (312).

6. The roller mill screening system according to claim 1, characterized in that, The reciprocating sliding ring (600) has several axial ventilation openings (620) on its inner wall. The housing (200) is provided with an air inlet (130) for connection with a compressor. The air inlet (130) communicates with the gap between the fixed sleeve (700) and the rotating shaft (400) so that the gap between the fixed sleeve (700) and the rotating shaft (400) forms a positive pressure environment.

7. A roller mill screening system according to claim 1, characterized in that, Also includes: A cleaning component (800) is rotatably disposed within the housing (200) and located below the roller mill (100). The cleaning component (800) has bristles extending outward for sweeping away residual ore on the roller shaft of the roller mill (100).

8. A roller mill screening process, using the roller mill screening system according to any one of claims 1 to 7 for screening mineral materials, characterized in that, include: S10: After coarse crushing, the raw ore is transferred to the medium crushing workshop for medium crushing and screening to obtain medium crushed ore and fine crushed ore. The medium crushed ore is then finely crushed and screened again until fine crushed ore is obtained. S20 involves dry screening of finely crushed ore to obtain concentrate and waste rock; S30, the concentrate is subjected to roller mill screening. The ore that does not meet the particle size requirements after screening is subjected to roller mill screening again until fine ore is obtained. S40 involves grinding and separating fine mineral materials to obtain concentrate powder.

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