A high-efficiency separation and screening device for calcium oxide raw material impurities

Abstract

The application relates to the field of screening separation technology and discloses a high-efficiency separation and screening device for calcium oxide raw materials with high impurities, which comprises a sorting frame, a support, a lower hopper, a magnetic roller, a discharge pipe, a waste pipe, a scraper, a screw conveyor and a linkage uniform material mechanism. A driving motor drives the magnetic roller to rotate at a low speed through a small pulley, a belt and a large pulley. After calcium oxide raw materials fall onto the surface of the magnetic roller, magnetic metal impurities are adsorbed by the magnetic roller and scraped into the waste pipe by the scraper, and qualified raw materials are discharged from the discharge pipe. The large pulley or the positioning shaft simultaneously links and adjusts the roller. The roller drives the push plate to reciprocate in the lower hopper through a guide groove, a sliding block and a sliding plate, so that the materials accumulated on both sides of the lower hopper are pushed to the central area, the center is prevented from being rapidly discharged to form a hollow, and the materials accumulated on both sides are prevented from forming a thick material layer. The discharged raw materials to be rescreened enter the screw conveyor through the return pipe and are lifted to the lower pipe. When the push plate moves, the sealing plug opens and closes the outlet of the lower pipe, so that the backflow materials are supplemented into the side gap left by the push plate.

Description

Technical Field

[0001] This invention belongs to the field of screening and separation technology, specifically, it relates to a high-efficiency screening and separation device for impurities in calcium oxide raw materials. Background Technology

[0002] During the crushing, transportation, storage, and feeding processes of calcium oxide raw materials, magnetic impurities such as iron filings, iron slag, and equipment wear particles can easily become mixed in. If these magnetic impurities are not removed in time, they will not only reduce the purity of the calcium oxide raw materials but may also cause abnormal wear on subsequent conveying, grinding, batching, or calcining equipment, affecting the stability of continuous production.

[0003] Currently, impurity removal from calcium oxide raw materials is typically carried out using methods such as vibrating screens, magnetic separators, or manual sampling. Vibrating screens are mainly used for particle size classification, but their ability to separate impurities such as iron filings and iron slag with particle sizes close to calcium oxide particles is limited. Although ordinary magnetic separators can adsorb magnetic impurities, their feeding often relies on the natural fall of the hopper. The material discharge speed in the center of the hopper is fast, while the material on the sides and edges is prone to stagnation, which can easily lead to problems such as central voids, side accumulation, and sudden thick material layers falling.

[0004] When calcium oxide raw material falls onto the surface of the magnetic roller in a thick or uneven layer, the fine iron filings and magnetic slag in the inner layer cannot fully approach the magnetic field adsorption area, resulting in missed screening. Furthermore, if the material after the initial magnetic separation needs to be screened again, a separate lifting and manual return process is often required. This not only occupies space, but the return location also cannot be matched with the material distribution in the hopper, easily causing uneven material distribution again. Calcium oxide is hygroscopic and produces a lot of dust; long-term exposure of the transmission structure can lead to problems such as dust entering the transmission gaps, increased wear, and jamming.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A high-efficiency separation and screening device for impurities in calcium oxide raw materials includes a sorting frame and a support for supporting the sorting frame. A hopper is provided at the upper end of the sorting frame. A magnetic roller is rotatably mounted inside the sorting frame, and a positioning shaft is fixedly connected to the magnetic roller. A discharge pipe is provided at the lower part of the sorting frame. A waste pipe and a scraper corresponding to the outer circumference of the magnetic roller are provided on one side of the sorting frame. One end of the positioning shaft extends out of the sorting frame and is connected to a large pulley. A drive motor is provided on the outer side of the sorting frame. The output end of the drive motor is connected to a mounting shaft. A small pulley is mounted on the mounting shaft, and a belt is fitted between the small pulley and the large pulley.

[0008] An adjusting roller is provided at one end of the positioning shaft extending out of the sorting frame. A guide groove is provided on the adjusting roller, and a slider is provided in the guide groove. The slider is connected to a sliding plate, and the sliding plate is connected to a push plate located in the hopper through a connecting plate. The sliding plate moves back and forth along the outside of the sorting frame under the rotation of the adjusting roller, so that the push plate pushes the calcium oxide raw material back and forth in the hopper.

[0009] A screw conveyor is provided on the outside of the support frame. The feed end of the screw conveyor is connected to the discharge pipe through a return pipe. The discharge end of the screw conveyor is connected to a discharge pipe facing the hopper. The push plate is connected to a sealing plug for opening and closing the outlet of the discharge pipe.

[0010] In a preferred embodiment of the present invention, a guide plate is provided in the sorting frame, the guide plate is located between the hopper and the magnetic roller, and the lower end of the guide plate is arranged facing the upper outer circumferential surface of the magnetic roller; the discharge pipe is located below the magnetic roller, and the waste pipe is located below the scraper.

[0011] In a preferred embodiment of the present invention, the scraper is fixedly disposed within the sorting frame, with the scraping end of the scraper facing the outer peripheral surface of the magnetic roller, and the scraper is disposed on the rotation path of the magnetic roller at a position after the discharge pipe and before the waste pipe.

[0012] In a preferred embodiment of the present invention, the adjusting roller is coaxially fixed with the positioning shaft, the guide groove is an eccentric guide groove extending circumferentially along the end face of the adjusting roller, an inner groove is formed in the guide groove, one end of the slider is embedded in the guide groove or the inner groove, and the other end of the slider is connected to the slide plate.

[0013] In a preferred embodiment of the present invention, a limiting rod and a limiting plate are provided on the outer side of the sorting frame, the sliding plate is slidably sleeved or slidably attached to the limiting rod, and the limiting plate is located on the side of the sliding plate away from the sorting frame to limit the swing of the sliding plate.

[0014] In a preferred embodiment of the present invention, the connecting plate extends into the hopper through the side wall or the upper edge of the hopper, the push plate is fixed to the lower end of the connecting plate, the lower end of the push plate is spaced apart from the inner wall of the hopper, and the side of the push plate faces the central area of ​​the hopper.

[0015] In a preferred embodiment of the present invention, a positioning frame is provided at the upper end of the push plate, an insertion rod is provided on the positioning frame, an insertion plate is provided on the insertion rod, an insertion sleeve is sleeved on the outside of the insertion rod, and the insertion sleeve is connected to the sealing plug; a fixing frame is provided on the screw conveyor or the bracket, a guide rod is provided on the fixing frame, and the sealing plug is slidably disposed on the guide rod and opposite to the outlet of the feed pipe.

[0016] In a preferred embodiment of the present invention, when the push plate moves toward the center area of ​​the hopper, the insert rod drives the sealing plug away from the outlet of the discharge pipe along the guide rod via the insert sleeve; when the push plate resets toward the side wall of the hopper, the sealing plug approaches and blocks the outlet of the discharge pipe along the guide rod.

[0017] In a preferred embodiment of the present invention, there are two screw conveyors, which are respectively arranged on opposite sides of the sorting frame; the upper end of each screw conveyor is connected to a discharge pipe, and the outlets of the two discharge pipes are respectively facing the two sides of the discharge hopper.

[0018] In a preferred embodiment of the present invention, a protective cover is provided on the outside of the sorting frame, and the large pulley, the belt, the small pulley, the adjusting roller and at least part of the slide plate are located inside the protective cover; the return pipe and the discharge pipe are detachably connected or communicated through a diversion port.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This invention utilizes a reciprocating pusher mechanism with a large pulley and coaxial linkage. This mechanism drives the pusher plate to move reciprocally towards the center of the hopper, pushing the accumulated calcium oxide material on both sides to the center. This promptly fills the voids and grooves created by the rapid central discharge. Simultaneously, as the pusher plate moves towards the center, gaps are created on its original sides. Combined with a sealing plug and discharge pipe structure mechanically linked to the pusher plate, the discharge pipe can open synchronously, precisely filling the gaps created by the pusher plate with the returned material awaiting rescreening. This structure balances the material storage in the entire hopper from two dimensions: central filling and side replenishment. It completely improves the uneven material distribution problem caused by excessively rapid central discharge and slow side discharge. This ensures that the material always falls onto the magnetic roller surface in a uniform, thin layer, avoiding the problem of fluctuating screening load caused by thick material layers. It stabilizes the working condition of the magnetic roller, prevents the leakage of inner impurities, and ensures continuous and stable operation of the magnetic separation and impurity removal process.

[0021] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency separation and screening device for impurities in calcium oxide raw materials according to the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of a high-efficiency separation and screening device for impurities in calcium oxide raw materials according to the present invention from another perspective;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0026] Figure 4 This is a schematic diagram of the internal structure of a high-efficiency separation and screening device for calcium oxide raw material impurities after removing part of the outer shell, according to the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of a high-efficiency separation and screening device for impurities in calcium oxide raw materials according to the present invention, viewed from an inclined perspective.

[0028] Figure 6 for Figure 5 A magnified view of the structure at point B in the middle;

[0029] Figure 7 This is a schematic diagram of the structure of a high-efficiency separation and screening device for impurities in calcium oxide raw materials according to the present invention, viewed from the rear side.

[0030] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point C.

[0031] In the diagram: 1. Sorting frame; 2. Support; 3. Feed hopper; 4. Protective cover; 5. Discharge pipe; 6. Waste pipe; 7. Scraper; 8. Magnetic roller; 9. Positioning shaft; 10. Large pulley; 11. Belt; 12. Small pulley; 13. Drive motor; 14. L-shaped frame; 15. Mounting shaft; 16. Screw conveyor; 17. Return pipe; 18. Feed pipe; 19. Adjusting roller; 20. Guide groove; 21. Inner groove; 22. Slider; 23. Slide plate; 24. Limiting rod; 25. Limiting plate; 26. Connecting plate; 27. Push plate; 28. Positioning frame; 29. ​​Insert rod; 30. Insert plate; 31. Insert sleeve; 32. Sealing plug; 33. Guide rod; 34. Fixing frame; 35. Guide plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0033] like Figures 1 to 8As shown, this embodiment provides a high-efficiency separation and screening device for impurities in calcium oxide raw materials, which includes a sorting frame 1, a support 2, a feeding hopper 3, a protective cover 4, a discharge pipe 5, a waste pipe 6, a scraper 7, a magnetic roller 8, a positioning shaft 9, a large pulley 10, a belt 11, a small pulley 12, a drive motor 13, an L-shaped frame 14, a mounting shaft 15, a screw conveyor 16, a return pipe 17, a feeding pipe 18, an adjusting roller 19, a guide groove 20, an inner groove 21, a slider 22, a sliding plate 23, a limiting rod 24, a limiting plate 25, a connecting plate 26, a push plate 27, a positioning frame 28, an insertion rod 29, an insertion plate 30, an insertion sleeve 31, a sealing plug 32, a guide rod 33, a fixing frame 34, and a guide plate 35.

[0034] The sorting frame 1 is mounted on the bracket 2. The hopper 3 is located at the upper end of the sorting frame 1, the discharge pipe 5 is located at the lower part of the sorting frame 1, and the waste pipe 6 is located at the lower part of one side of the sorting frame 1. The magnetic roller 8 is rotatably mounted inside the sorting frame 1 via the positioning shaft 9. The magnetic roller 8 is preferably a magnetic separator with a permanent magnet inside or a magnetic field adsorption zone formed on its outer periphery. The guide plate 35 is located between the hopper 3 and the magnetic roller 8. Its upper end receives the calcium oxide raw material falling from the hopper 3, and its lower end faces the upper outer periphery of the magnetic roller 8, so that the raw material can fall onto the surface of the magnetic roller 8 in a predetermined direction.

[0035] The scraper 7 is fixedly installed inside the sorting frame 1 and close to the outer circumference of the magnetic roller 8, with the waste pipe 6 below the scraper 7. When the magnetic roller 8 rotates, the non-magnetic calcium oxide raw material slides off the surface of the magnetic roller 8 by gravity and enters the discharge pipe 5; the magnetic impurities such as iron filings and iron slag adsorbed by the magnetic roller 8 rotate with the magnetic roller 8 to the scraper 7, and are scraped off the outer circumference of the magnetic roller 8 by the scraper 7 and fall into the waste pipe 6.

[0036] One end of the positioning shaft 9 extends out of the sorting frame 1 and connects to the large pulley 10. The drive motor 13 is mounted on the outside of the L-shaped frame 14 or the sorting frame 1. The output end of the drive motor 13 is connected to the mounting shaft 15. The small pulley 12 is fixed on the mounting shaft 15, and a belt 11 is fitted between the small pulley 12 and the large pulley 10. Because the diameter of the small pulley 12 is smaller than that of the large pulley 10, the speed output of the drive motor 13 is reduced after belt transmission, causing the magnetic roller 8 to rotate at a low and stable speed. A protective cover 4 is installed on the outside of the sorting frame 1 to cover at least part of the structure of the large pulley 10, belt 11, small pulley 12, adjusting roller 19, and slide plate 23.

[0037] An adjusting roller 19 is positioned at the end of the positioning shaft 9 extending out of the sorting frame 1, preferably coaxially fixed with the positioning shaft 9. A guide groove 20 is provided on the end face of the adjusting roller 19. The guide groove 20 can be an eccentric annular groove, a wavy groove, or a closed groove with radial undulations, and a recessed groove 21 is partially formed within the guide groove 20. One end of the slider 22 is embedded in the guide groove 20, and the other end is connected to the slide plate 23. A limiting rod 24 and a limiting plate 25 are provided on the outer side of the sorting frame 1. The slide plate 23 slides back and forth along the direction of the limiting rod 24, and the limiting plate 25 restricts the swaying of the slide plate 23. Thus, when the positioning shaft 9 drives the magnetic roller 8 to rotate, the adjusting roller 19 rotates synchronously, and the slider 22 drives the slide plate 23 to move back and forth under the action of the guide groove 20.

[0038] The slide plate 23 is connected to the push plate 27 via the connecting plate 26. The connecting plate 26 passes through the side wall of the hopper 3 to make way or extends into the hopper 3 from the top edge of the hopper 3. The push plate 27 is fixed to the lower end of the connecting plate 26 and is located inside the hopper 3. The pushing surface of the push plate 27 faces the center area of ​​the hopper 3. When the slide plate 23 moves back and forth, the connecting plate 26 drives the push plate 27 to move towards the center or back to the side wall inside the hopper 3, so as to periodically push the calcium oxide raw material retained on the side of the hopper 3.

[0039] Screw conveyors 16 are positioned outside the sorting frame 1, preferably two, located on the left and right sides of the sorting frame 1 respectively. The lower feed end of the screw conveyor 16 is connected to the discharge pipe 5 via a return pipe 17, which is used to guide the calcium oxide raw material requiring re-screening into the screw conveyor 16. The return pipe 17 can be detachably connected to the discharge pipe 5, or connected via a branch port at the lower end of the discharge pipe 5; when re-screening is not required, the discharge pipe 5 can be directly connected to the finished product collection container. The upper discharge end of the screw conveyor 16 is connected to the discharge pipe 18, with the outlet of the discharge pipe 18 facing the side area of ​​the discharge hopper 3.

[0040] A positioning frame 28 is provided on the upper end of the push plate 27. An insertion rod 29 is mounted on the positioning frame 28, and an insertion plate 30 is mounted on the insertion rod 29. A sleeve 31 is fitted over the outside of the insertion rod 29. The sleeve 31 is connected to the sealing plug 32. A fixing frame 34 is mounted on the screw conveyor 16 or the support 2. A guide rod 33 is provided on the fixing frame 34. The extension direction of the guide rod 33 is consistent with the opening and closing movement direction of the sealing plug 32. The sealing plug 32 is slidably fitted onto the guide rod 33 and is opposite to the outlet of the discharge pipe 18. The insertion rod 29 and the sleeve 31 cooperate to transmit movement between the push plate 27 and the sealing plug 32, while the insertion plate 30 prevents disengagement.

[0041] As the pusher plate 27 moves towards the center of the lower hopper 3, it moves away from the area near the side wall of the hopper 3, creating a gap on that side that can receive the returned material. Simultaneously, the positioning frame 28, the insert rod 29, and the insert sleeve 31 move the sealing plug 32 away from the outlet of the discharge pipe 18 along the guide rod 33, opening the discharge pipe 18 and allowing the raw material to be re-screened from the screw conveyor 16 to fall into the aforementioned side gap. When the pusher plate 27 returns to its original position towards the side wall, the sealing plug 32 simultaneously approaches and blocks the outlet of the discharge pipe 18, stopping the feeding action, thus ensuring that the feeding action and the pusher plate's repositioning action are mechanically synchronized.

[0042] In operation, the operator feeds the crushed calcium oxide raw material into the hopper 3. The raw material falls onto the surface of the magnetic roller 8 via the guide plate 35. The drive motor 13 drives the positioning shaft 9 and the magnetic roller 8 to rotate at low speed via the small pulley 12, belt 11, and large pulley 10. Magnetic impurities such as iron filings and iron slag in the calcium oxide raw material are attracted by the magnetic roller 8, while non-magnetic calcium oxide raw material is discharged from the discharge pipe 5. Magnetic impurities are scraped off by the scraper 7 as the magnetic roller 8 rotates and are discharged from the waste pipe 6.

[0043] During the rotation of the magnetic roller 8, the adjusting roller 19 synchronously drives the slide plate 23 to move back and forth. The slide plate 23 drives the push plate 27 to push the material back and forth in the hopper 3 via the connecting plate 26. The push plate 27 pushes the material stuck on both sides of the hopper 3 toward the central area, filling the void formed by the rapid material discharge in the center, making the material layer thickness on the surface of the magnetic roller 8 more uniform.

[0044] When the calcium oxide raw material discharged from the discharge pipe 5 needs further screening, the material enters the screw conveyor 16 through the return pipe 17 and is lifted by the screw conveyor 16 to the discharge pipe 18. When the push plate 27 pushes the material towards the center and makes room on the side, the sealing plug 32 simultaneously opens the outlet of the discharge pipe 18, and the returned material fills the side gap; when the push plate 27 resets, the sealing plug 32 closes the outlet of the discharge pipe 18. The returned material then falls again onto the surface of the magnetic roller 8 through the guide plate 35 along with the raw material in the discharge hopper 3, realizing secondary or multiple magnetic separation.

[0045] In this embodiment, the return pipe 17 is used to transport qualified raw materials that need to be screened again or raw materials to be screened again, and the waste pipe 6 is used to discharge magnetic impurities. The names and discharge paths of the two are distinct, which can avoid confusion between qualified raw materials and impurities in the structural description. In practical applications, one-time screening or multiple-cycle screening can be set according to the impurity content of the calcium oxide raw material.

[0046] The implementation principle of the calcium oxide raw material impurity high-efficiency separation and screening device of the present invention is as follows:

[0047] The operator first puts a large amount of crushed calcium oxide into the feeding hopper 3, and the raw material in the feeding hopper 3 falls into the sorting frame 1. Through the guiding action of the guide plate 35, the raw material can finally fall onto the surface of the magnetic roller 8.

[0048] At the same time, the operator needs to start the drive motor 13, which drives the mounting shaft 15 to rotate, and the mounting shaft 15 drives the small pulley 12 to rotate synchronously. The small pulley 12 drives the large pulley 10 to rotate synchronously through the belt 11. By limiting the size of the small pulley 12 and the large pulley 10, the rotation speed of the large pulley 10 is slowed down synchronously, so that the magnetic roller 8 rotates at a low speed and smoothly, avoiding the calcium oxide raw material from splashing and incomplete screening due to excessive speed. The large pulley 10 drives the magnetic roller 8 to rotate synchronously through the positioning shaft 9.

[0049] The crushed calcium oxide raw material contains a large amount of magnetic metal impurities such as iron slag and iron filings. Under the adsorption of the permanent magnetic field inside the magnetic roller 8, the magnetic impurities in the raw material are firmly adsorbed and fixed on the outer surface of the magnetic roller 8. The non-magnetic qualified calcium oxide raw material is not affected by the magnetic field adsorption force and slides down naturally along the surface of the rotating magnetic roller 8 by its own gravity. Finally, it is smoothly discharged from the discharge pipe 5 connected to the bottom of the equipment, completing the automatic collection and discharge of qualified calcium oxide raw material.

[0050] As the magnetic roller 8 rotates at a constant speed, when the roller area adsorbed with magnetic impurities rotates to the corresponding position of the scraper 7, the fixed hard scraper 7 closely adheres to the outer wall of the magnetic roller 8, hard scraping away all the metallic magnetic impurities adsorbed on the outer wall. The scraped-off impurities are uniformly collected downwards and finally discharged outwards through the waste pipe 6 installed on the side, thus achieving complete separation of impurities and qualified raw materials.

[0051] The entire transmission structure is sealed with a protective cover 4 on the outside, which can completely enclose and cover the transmission components such as belt 11, large pulley 10, and small pulley 12. On the one hand, it prevents calcium oxide dust from entering the transmission gap and causing jamming and wear, thus extending the service life of the transmission components; on the other hand, it prevents the transmission structure from being exposed and causing safety hazards, while also blocking the overflow of production dust and optimizing the workshop production environment.

[0052] When the qualified raw material discharged from the discharge pipe 5 is transported to the inside of the screw conveyor 16 through the external waste pipe 17, the calcium oxide raw material after preliminary screening is transported vertically upward with the continuous lifting action of the screw blades of the screw conveyor 16 until the raw material is transported to the discharge pipe 18 at the top of the screw conveyor 16 to complete temporary storage, thereby realizing the automatic return circulation of the secondary screening raw material.

[0053] During the sliding process of the slide plate 23, the connecting plate 26 fixed on the outside is moved in the same direction, which eventually drives the push plate 27 connected to the bottom of the connecting plate 26 to move back and forth towards and separate from the center of the hopper 3. In response to the common problems in the use of the hopper 3, such as the excessively fast central discharge flow rate, the concentrated falling of raw materials forming empty grooves, the accumulation of raw materials on both sides of the hopper edge, the slow discharge flow rate, and the uneven overall material distribution, which leads to the inconsistent screening load of the magnetic roller 8 and the reduced impurity removal effect, the push plates 27 on both sides alternately push the material towards the center, continuously pushing the calcium oxide raw material that is stuck and accumulated at the edge of the hopper 3 to the center of the hopper, filling the grooves formed by the central discharge, balancing the discharge speed of the entire hopper, and allowing the raw material to be evenly and thinly spread on the surface of the magnetic roller 8. This avoids the problem of the raw material being piled up in a thick layer, which would prevent the internal magnetic impurities from being fully adsorbed by the magnetic field, and further improves the overall impurity separation accuracy.

[0054] As the push plate 27 moves, the positioning frame 28 and the insertion rod 29 on the push plate 27 move synchronously. The insertion sleeve 31 slidably set on the insertion rod 29 drives the sealing plug 32 to move synchronously. The sealing plug 32 slides synchronously along the guide rod 33, eventually separating the sealing plug 32 from the opening of the discharge pipe 18 at the top of the screw conveyor 16. The raw material temporarily stored inside the discharge pipe 18, which is to be screened again, falls accurately into the side gap vacated after the push plate is moved. This fills the side material gaps that were originally too small on both sides and appeared after the push plate was moved, balancing the raw material storage on the side and center of the hopper, and eliminating the problem of fast discharge in the center of the hopper and poor discharge on the side due to the push plate occupying space. When the push plate 27 returns to its initial position on both sides and seals the side gaps, the sealing plug 32 synchronously resets and re-seals the opening of the discharge pipe 18, automatically cutting off the material supply.

[0055] The returned raw material falling into the side gaps will later slide down along with the overall material inside the hopper, and after being guided again by the guide plate 35, it will be spread flat on the surface of the magnetic roller 8, thus completing the secondary magnetic separation operation. During the initial screening process, some fine magnetic impurities are wrapped inside the calcium oxide raw material and cannot fully contact the magnetic roller 8, resulting in missed screening. When passing through the magnetic roller 8 for the second time, the trace iron filings and magnetic slag remaining inside can be completely adsorbed and intercepted by the magnetic field. The adsorbed impurities still follow the rotation of the magnetic roller to the scraper position for scraping and are finally discharged from the waste pipe 6. The qualified calcium oxide raw material after the secondary deep impurity removal is discharged again through the discharge pipe 5. If there are still impurities remaining in the raw material, it can be returned to the screen again by the screw conveyor to achieve multiple cycles of magnetic separation.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency separation and screening device for impurities in calcium oxide raw materials, comprising a sorting frame (1) and a support (2) for supporting the sorting frame (1), wherein a hopper (3) is provided at the upper end of the sorting frame (1), a magnetic roller (8) is rotatably arranged inside the sorting frame (1), the magnetic roller (8) is fixedly connected to a positioning shaft (9), a discharge pipe (5) is provided at the lower part of the sorting frame (1), and a waste pipe (6) and a scraper (7) corresponding to the outer circumferential surface of the magnetic roller (8) are provided on one side of the sorting frame (1), characterized in that: One end of the positioning shaft (9) extends out of the sorting frame (1) and is connected to a large pulley (10). A drive motor (13) is provided on the outside of the sorting frame (1). The output end of the drive motor (13) is connected to the mounting shaft (15). A small pulley (12) is provided on the mounting shaft (15). A belt (11) is sleeved between the small pulley (12) and the large pulley (10). The positioning shaft (9) extends out of the sorting frame (1) and is also provided with an adjusting roller (19). The adjusting roller (19) is provided with a guide groove (20). A slider (22) is provided in the guide groove (20). The slider (22) is connected to a sliding plate (23). The sliding plate (23) is connected to a push plate (27) located in the hopper (3) through a connecting plate (26). The sliding plate (23) moves back and forth along the outside of the sorting frame (1) under the rotation of the adjusting roller (19) so that the push plate (27) pushes the calcium oxide raw material back and forth in the hopper (3). A screw conveyor (16) is provided on the outside of the bracket (2). The feed end of the screw conveyor (16) is connected to the discharge pipe (5) through the return pipe (17). The discharge end of the screw conveyor (16) is connected to the discharge pipe (18) facing the discharge hopper (3). The push plate (27) is connected to a sealing plug (32) for opening and closing the outlet of the discharge pipe (18).

2. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 1, characterized in that: The sorting frame (1) is provided with a guide plate (35), which is located between the hopper (3) and the magnetic roller (8). The lower end of the guide plate (35) is arranged facing the upper outer circumference of the magnetic roller (8). The discharge pipe (5) is located below the magnetic roller (8), and the waste pipe (6) is located below the scraper (7).

3. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 2, characterized in that: The scraper (7) is fixedly installed inside the sorting frame (1). The scraping end of the scraper (7) faces the outer circumferential surface of the magnetic roller (8), and the scraper (7) is located on the rotation path of the magnetic roller (8) after the discharge pipe (5) and before the waste pipe (6).

4. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 1, characterized in that: The adjusting roller (19) is fixed coaxially with the positioning shaft (9). The guide groove (20) is an eccentric guide groove extending circumferentially along the end face of the adjusting roller (19). An inner groove (21) is formed in the guide groove (20). One end of the slider (22) is embedded in the guide groove (20) or the inner groove (21). The other end of the slider (22) is connected to the slide plate (23).

5. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 4, characterized in that: The outer side of the sorting frame (1) is provided with a limiting rod (24) and a limiting plate (25). The sliding plate (23) is slidably sleeved or slidably attached to the limiting rod (24). The limiting plate (25) is located on the side of the sliding plate (23) away from the sorting frame (1) to limit the swing of the sliding plate (23).

6. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 5, characterized in that: The connecting plate (26) extends into the hopper (3) through the side wall or upper edge of the hopper (3), the push plate (27) is fixed to the lower end of the connecting plate (26), the lower end of the push plate (27) is spaced apart from the inner wall of the hopper (3), and the side of the push plate (27) faces the central area of ​​the hopper (3).

7. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 6, characterized in that: The upper end of the push plate (27) is provided with a positioning frame (28), the positioning frame (28) is provided with a plug rod (29), the plug rod (29) is provided with a plug plate (30), the plug rod (29) is provided with a plug sleeve (31) on the outside of the plug sleeve (29), the plug sleeve (31) is connected to the sealing plug (32); the screw conveyor (16) or the bracket (2) is provided with a fixing frame (34), the fixing frame (34) is provided with a guide rod (33), the sealing plug (32) is slidably disposed on the guide rod (33) and is opposite to the outlet of the feed pipe (18).

8. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 7, characterized in that: When the push plate (27) moves toward the center area of ​​the hopper (3), the insert rod (29) drives the sealing plug (32) away from the outlet of the discharge pipe (18) along the guide rod (33) through the insert sleeve (31); when the push plate (27) resets toward the side wall of the hopper (3), the sealing plug (32) approaches and blocks the outlet of the discharge pipe (18) along the guide rod (33).

9. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 1, characterized in that: There are two screw conveyors (16), which are respectively located on opposite sides of the sorting frame (1); the upper end of each screw conveyor (16) is connected to a feed pipe (18), and the outlets of the two feed pipes (18) are respectively facing the two sides of the feed hopper (3).

10. The high-efficiency separation and screening equipment for impurities in calcium oxide raw materials according to claim 1, characterized in that: The outer side of the sorting frame (1) is provided with a protective cover (4), the large pulley (10), the belt (11), the small pulley (12), the adjusting roller (19) and at least part of the sliding plate (23) are located inside the protective cover (4); the return pipe (17) is detachably connected to the discharge pipe (5) or connected through the diversion port.

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