Secondary screening and recycling device for sintering return mine

Abstract

The utility model discloses a sintering return mine secondary screening recovery device which comprises supporting legs and a screening frame, a flat plate and a vibrating screen are sequentially arranged in the screening frame from top to bottom, an inverted-V-shaped material distribution plate is arranged on the portion, above the flat plate, of the screening frame, and a material passing channel is reserved between the lower end of the material distribution plate and the flat plate. L-shaped through holes are correspondingly machined in the two sides of the screening frame above the vibrating screen, sliding blocks are arranged in the L-shaped through holes in a sliding mode, a rotating shaft is arranged between the two sliding blocks, a steel brush is arranged on the rotating shaft, one end of the rotating shaft is in transmission connection with a cleaning motor, air cylinders are arranged on the screening frame on the two sides above each L-shaped through hole, and supporting blocks are connected to the ends of piston rods of the air cylinders. A screw is rotationally connected between the two supporting blocks, one end of the screw is in transmission connection with a transverse moving motor, the screw is connected with a connecting block through threads, and the lower end of the connecting block is connected with the corresponding sliding block. In conclusion, the rotary screen has the advantages of being capable of automatically cleaning return mine, high in screening efficiency and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary screening of returned ore, in particular to a secondary screening and recovery device for sintered returned ore. Background Art

[0002] Before blast furnace ironmaking, the raw materials need to be sintered. Sintering is the process of mixing various powdered iron-containing raw materials with appropriate amounts of fuel and solvent, adding an appropriate amount of water, and then sintering them into blocks through a series of physical and chemical changes on sintering equipment after mixing and pelletizing. During the production process, in order to ensure the smooth operation of the blast furnace, there are very strict requirements on the particle size of the sintered ore entering the blast furnace. The sintered ore needs to be screened once, and the oversize material is sent to the furnace for smelting. The undersize material is called return ore, which is mainly returned to the raw material yard and mixed with the raw materials for re-roasting. At present, the particle size of the return ore from the under-trough vibrating screen is generally 6-8mm. Among them, the return ore with a particle size greater than 5mm can be recycled for secondary use, and the amount of this return ore is 30-40%. After recycling, it is transported to the blast furnace for continued use according to the material ratio, which can improve the utilization rate of the sintered ore and reduce production costs.

[0003] In order to recover the large particles of sintered return ore in the primary screening, a corresponding screening device is required for secondary screening. However, the following problems still exist in the secondary screening process: First, due to the irregular shape of the return ore, it is very easy to clog the vibrating screen holes. The cleaning and unblocking of the vibrating screen holes requires downtime, which takes a long time and affects the efficiency of the secondary screening of the return ore; second, the return ore is unevenly distributed on the vibrating screen. The return ore is often concentrated in the middle of the vibrating screen, with less or even no return ore distributed on both sides, which reduces the effective utilization area of ​​the vibrating screen surface, which not only reduces the screening efficiency of the return ore, but also causes the screen bars in the middle of the vibrating screen to wear heavily, while the screen bars on both sides wear less or are almost intact, reducing the service life of the vibrating screen. Therefore, it is an objective need to develop a sintered return ore secondary screening recovery device that can automatically clean the return ore, has high screening efficiency, and has a long service life. Utility Model Content

[0004] The utility model aims to provide a sintered return ore secondary screening and recovery device which can automatically clean the return ore, has high screening efficiency and long service life.

[0005] The purpose of the present utility model is achieved in this way, comprising a support leg and a screening frame obliquely arranged on the support leg, a flat plate and a vibrating screen are arranged in sequence inside the screening frame from high to low, an inverted V-shaped cloth plate is provided on the screening frame above the flat plate, and a feeding channel is left between the lower end of the cloth plate and the flat plate, L-shaped through holes are processed on both sides of the screening frame above the vibrating screen, a slider is slidingly arranged in the L-shaped through hole, a rotating shaft is provided between the two sliders, a steel brush is provided on the rotating shaft, one end of the rotating shaft is connected to a cleaning motor for transmission, a cylinder is provided on the screening frames on both sides above each L-shaped through hole, the piston rod end of the cylinder is connected to a support block, a screw is rotatably connected between the two support blocks, one end of the screw is connected to a transverse motor for transmission, a connecting block is threadedly connected to the screw, and the lower end of the connecting block is connected to the corresponding slider.

[0006] Furthermore, gaps are left between both sides of the distribution plate and the screening frame, a V-shaped material distribution plate is provided on the screening frame on the lower side of the distribution plate, and a material passing channel is left between the material distribution plate and the flat plate.

[0007] Furthermore, the distribution plate can slide up and down on the screening frame.

[0008] Furthermore, sealing plates are provided on the top and both ends of the screening frame, a dust exhaust pipe is provided on the sealing plate on the top of the screening frame, and an exhaust fan is provided on the dust exhaust pipe.

[0009] Furthermore, a spring is provided between the upper end of the support leg and the screening frame.

[0010] Furthermore, slide rails are provided on two side surfaces of the screening frame, and the support blocks are slidably mounted on the slide rails.

[0011] Furthermore, the rotating shaft includes a middle shaft and two end shafts at both ends thereof, and the middle shaft and the end shafts are connected by flanges.

[0012] The return ore is fed into the sieve and then sent to the middle area of ​​the higher end of the flat plate. The return ore moves down along the flat plate under the action of its own gravity and vibration. When passing through the distribution plate, on the one hand, the distribution plate diverts the return ore, and the return ore is divided into two parts and moves to both sides respectively. On the other hand, a feeding channel is left between the distribution plate and the flat plate. The height of the feeding channel determines the thickness of the return ore spread on the flat plate. After the above steps, the return ore is evenly spread on the flat plate, and the accumulation thickness of the return ore at each part is consistent. Then the return ore enters the vibrating screen, and the return ore particles with smaller particle size are undersize, which pass through the vibrating screen and fall to the bottom of the screening frame and are discharged. They return to the raw material field and are mixed with the raw materials for re-roasting. The return ore particles with larger particle size are oversize, which continuously move downward along the vibrating screen under the action of vibration until they are discharged from the lower end of the vibrating screen, thereby completing the secondary screening and recovery of the sintered return ore. After recovery, the ore is transported to the blast furnace for continued use according to the material ratio. The utility model is used in the process of using, and after a period of use, the screen holes of the vibrating screen are partially blocked. At this time, the cleaning motor is started, and the cleaning motor drives the rotating shaft and the steel brush to rotate in sequence, and the transverse motor is started at the same time. The transverse motor drives the screw to rotate, and then drives the connecting block to move, and the connecting block drives the slider to slide downward in the L-shaped through-hole, and the rotating steel brush is used to clean the vibrating screen, and the sintered return ore blocking the screen holes of the vibrating screen is cleaned out. After the cleaning of the sintered return ore is completed, the steel brush is driven to move up to the higher end of the L-shaped through-hole by the reverse rotation of the transverse motor, and then the cylinder is started to drive the supporting block, screw, supporting block, connecting block, slider and rotating shaft and other components to move up and reset along the vertical part of the L-shaped through-hole. The above method can complete the cleaning process. The cleaning of the vibrating screen ensures the screening efficiency of the vibrating screen. Compared with the manual cleaning method, this device can be carried out automatically, with high cleaning efficiency and short time consumption. It can put the vibrating screen into use quickly and improve the screening efficiency of the sintered return ore. Secondly, before the return ore enters the vibrating screen, the device is equipped with a flat plate and a distribution plate so that the return material is evenly spread on the flat plate, and the stacking thickness of the return material in each part is consistent. In this way, when the return ore enters the vibrating screen, it can be more evenly distributed in various parts of the vibrating screen, thereby increasing the effective utilization area of ​​the vibrating screen surface, thereby increasing the screening efficiency of the return ore. At the same time, it avoids the problem of concentrated wear of the screen bars in the middle area of ​​the vibrating screen by the return ore. When processing the same amount of return ore, it can effectively increase the service life of the vibrating screen. In summary, the utility model has the advantages of automatic cleaning of return ore, high screening efficiency and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0015] In the figure: 1-support leg, 2-screening frame, 3-flat plate, 4-vibrating screen, 5-distributing plate, 6-L-shaped through hole, 7-slider, 8-rotating shaft, 9-steel brush, 10-cleaning motor, 11-cylinder, 12-support block, 13-screw, 14-traverse motor, 15-connecting block, 16-equalizing plate, 17-sealing plate, 18-exhaust fan, 19-spring, 20-slide rail, 21-flange. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements based on the present invention fall within the scope of protection of the present invention.

[0017] like Figures 1-2 As shown, the utility model includes a support leg 1 and a screening frame 2 obliquely arranged on the support leg 1, and a flat plate 3 and a vibrating screen 4 are arranged in sequence inside the screening frame 2 from high to low. An inverted V-shaped cloth plate 5 is provided on the screening frame 2 above the flat plate 3, and a passing channel is left between the lower end of the cloth plate 5 and the flat plate 3. L-shaped through holes 6 are correspondingly processed on both sides of the screening frame 2 above the vibrating screen 4, and a slider 7 is slidingly arranged in the L-shaped through hole 6. A rotating shaft 8 is provided between the two sliders 7, and a steel brush 9 is provided on the rotating shaft 8. One end of the rotating shaft 8 is connected to a cleaning motor 10 for transmission. A cylinder 11 is provided on the screening frame 2 on both sides above each L-shaped through hole 6, and the piston rod end of the cylinder 11 is connected to a support block 12. A screw 13 is rotatably connected between the two support blocks 12, and one end of the screw 13 is connected to a transverse motor 14 for transmission. A connecting block 15 is threadedly connected to the screw 13, and the lower end of the connecting block 15 is connected to the corresponding slider 7. The cleaning motor 10, the cylinder 11 and the traverse motor 14 are all existing equipment and can be purchased and installed on the market according to actual needs when used.

[0018] The return material is then fed to the sieve 3 and the sieve is fed to the sieve 4. The sieve is fed to the sieve 5 and the sieve is fed to the sieve 6. The sieve is fed to the sieve 7 and the sieve is fed to the sieve 8. The sieve is fed to the sieve 9 and the sieve is fed to the sieve 10. During the use of the present invention, after a period of time, the screen holes of the vibrating screen 4 are partially blocked. At this time, the cleaning motor 10 is started, and the cleaning motor 10 drives the rotating shaft 8 and the steel brush 9 to rotate together in sequence, and the transverse motor 14 is started at the same time. The transverse motor 14 drives the screw 13 to rotate, and then drives the connecting block 15 to move. The connecting block 15 drives the slider 7 to slide downward in the L-shaped through hole 6, and the rotating steel brush 9 is used to clean the vibrating screen 4, and the sintered return ore blocked on the screen holes of the vibrating screen 4 is cleaned out. After the cleaning of the sintered return ore is completed, the steel brush 9 is driven to move up to the higher end of the L-shaped through hole 6 by the reverse rotation of the transverse motor 14, and then the cylinder 11 is started to drive the supporting block 12, the screw 13, the connecting block 15, the slider 7 and the rotating shaft 8 and other components to move up along the vertical part of the L-shaped through hole 6 for cleaning. In this way, the cleaning of the vibrating screen 4 is completed, and the screening efficiency of the vibrating screen 4 is ensured. Compared with the manual cleaning method, the present device can be automatically carried out, with high cleaning efficiency and short time consumption, so that the vibrating screen 4 can be put into use quickly, thereby improving the screening efficiency of the sintered return ore; secondly, before the return ore enters the vibrating screen 4, the present device is provided with a flat plate 3 and a distribution plate 5, so that the return material is evenly spread on the flat plate 3, and the stacking thickness of the return material in each part is consistent. In this way, when the return ore enters the vibrating screen 4, it can be more evenly distributed in various parts of the vibrating screen 4, thereby improving the effective utilization area of ​​the screen surface of the vibrating screen 4, thereby improving the screening efficiency of the return ore, and at the same time, avoiding the problem of concentrated wear of the screen bars in the middle area of ​​the vibrating screen 4 by the return ore. When processing the same amount of return ore, the service life of the vibrating screen 4 can be effectively improved.

[0019] There is a gap between both sides of the distribution plate 5 and the screening frame 2. A V-shaped equalizing plate 16 is provided on the screening frame 2 on the lower side of the distribution plate 5. A equalizing channel is left between the equalizing plate 16 and the flat plate 3. The height of the equalizing channel is greater than the height of the feeding channel. In actual use of this device, it is found that when there is an abnormal feeding or a large amount of returned ore, a large amount of returned ore will fall on the flat plate 3. Due to the limitation of the size of the feeding channel, the returned ore cannot all pass through the feeding channel in time, which will cause a large amount of returned ore to accumulate, which is not conducive to the normal screening of the returned ore. In order to solve this problem, an equalizing plate 16 is provided, and there is a gap between both sides of the distribution plate 5 and the screening frame 2. During operation, the excess returned ore will fall from the gap to both sides of the equalizing plate 16 for the returned ore to be distributed again. Since the height of the equalizing channel is greater than the height of the feeding channel, the thickness of the returned ore can be evenly increased by the equalizing plate 16, thereby meeting the requirements for the passage of the returned ore and avoiding the problem of return ore accumulation.

[0020] The distribution plate 5 can slide up and down on the screening frame 2. In this device, a feeding channel is left between the distribution plate 5 and the flat plate 3, and the return ore passes through the feeding channel. It can be seen that the height of the feeding channel determines the stacking thickness of the return ore. In order to achieve the adjustment of the stacking thickness of the return ore, adapt to the screening of various return ore particle sizes, and meet the screening requirements of various vibrating screens, the distribution plate 5 can move up and down on the screening frame 2. The moving method can select existing structures such as rails, slides and corresponding lifting devices. It is only necessary to ensure that the distribution plate 5 can move up and down.

[0021] The top and both ends of the screening frame 2 are provided with sealing plates 17. The sealing plates 17 and the screening frame 2 are closed together to form a sealed space. The sealing plate 17 on the top of the screening frame 2 is provided with a dust exhaust pipe, and the dust exhaust pipe is provided with an exhaust fan 18. When the device is in operation, a large amount of dust will be generated, and the discharge thereof will cause pollution to the surrounding environment. For this reason, an exhaust fan 18 is provided to extract the dust through the exhaust fan 18. Generally, the dust will be sent to the dust removal equipment for dust removal and purification to prevent the environment from being polluted. Secondly, during the vibration screening process of the device, and when the steel brush 9 is used to process the blocked return ore, the return ore may fly out of the screening frame 2, which poses a certain safety hazard. After the sealing plate 17 is provided, the return ore can be prevented from flying out of the screening frame 2, thereby improving the safety of the device during operation.

[0022] A spring 19 is provided between the upper end of the support leg 1 and the screening frame 2. During use, the device will generate large vibrations. The spring 19 is provided to buffer the vibrations. In actual use, a telescopic rod can be provided inside the spring 19 to prevent the spring 19 from tilting.

[0023] Slide rails 20 are provided on both sides of the screening frame 2, and the support block 12 is slidably installed on the slide rails 20. The slide rails 20 can guide and limit the up and down movement of the support block 12 to prevent the support block 12 from tilting. In actual use, a T-shaped or dovetail-shaped sliding connection structure can be selected between the slide rails 20 and the support block 12 to prevent the support block 12 from falling off the slide rails 20 and improve the stability of the support block 12 when it moves up and down.

[0024] The rotating shaft 8 includes a middle shaft and two end shafts at both ends thereof, and the middle shaft and the end shafts are connected by flanges 21. During use of the device, the sintered return ore that is blocked on the sieve holes of the vibrating screen 4 is cleaned by the steel brush 9. As the use time increases, the steel brush 9 will continue to wear and shorten. After reaching a certain extent, the steel brush 9 will become ineffective and need to be replaced. In order to facilitate the replacement and disassembly of the steel brush 9, the rotating shaft 8 is set as a three-section structure, which is a middle shaft and two end shafts. The steel brush 9 is set on the middle middle shaft. When the steel brush 9 needs to be replaced, it is only necessary to loosen the flange between the middle shaft and the end shaft to take out the steel brush 9 connected to the middle shaft.

Claims

1. A secondary screening and recovery device for sintered return ore, comprising a support leg (1) and a screening frame (2) obliquely arranged on the support leg (1), characterized in that The inside of the screening frame (2) is provided with a flat plate (3) and a vibrating screen (4) in order from high to low. The screening frame (2) above the flat plate (3) is provided with an inverted V-shaped distribution plate (5). A material passage is left between the lower end of the distribution plate (5) and the flat plate (3). L-shaped through holes (6) are processed on both sides of the screening frame (2) above the vibrating screen (4). A slider (7) is provided in the L-shaped through hole (6). A rotating shaft (8) is provided between the two sliders (7). A steel brush (9) is provided on the rotating shaft (8). One end of the rotating shaft (8) is connected to a cleaning motor (10) in a transmission manner. A cylinder (11) is provided on the screening frame (2) on both sides above each L-shaped through hole (6). The piston rod end of the cylinder (11) is connected to a support block (12). A screw (13) is rotatably connected between the two support blocks (12). One end of the screw (13) is connected to a transverse motor (14). A connecting block (15) is connected to the screw (13) through a thread. The lower end of the connecting block (15) is connected to the corresponding slider (7).

2. The sintered ore secondary screening and recovery device according to claim 1, characterized in that Gaps are left between both sides of the distribution plate (5) and the screening frame (2), and a V-shaped material distribution plate (16) is provided on the screening frame (2) on the lower side of the distribution plate (5). A material distribution channel is left between the material distribution plate (16) and the flat plate (3), and the height of the material distribution channel is greater than the height of the material passing channel.

3. The sintered ore secondary screening and recovery device according to claim 1, characterized in that The material distribution plate (5) can slide up and down on the screening frame (2).

4. The sintered ore secondary screening and recovery device according to claim 1, characterized in that The top and both ends of the screening frame (2) are provided with sealing plates (17), the sealing plate (17) at the top of the screening frame (2) is provided with a dust exhaust pipe, and the dust exhaust pipe is provided with an exhaust fan (18).

5. The sintered ore secondary screening and recovery device according to claim 1, characterized in that A spring (19) is provided between the upper end of the support leg (1) and the screening frame (2).

6. The sintered ore secondary screening and recovery device according to claim 1, characterized in that Slide rails (20) are provided on two side surfaces of the screening frame (2), and the support block (12) is slidably mounted on the slide rails (20).

7. The sintered ore secondary screening and recovery device according to claim 1, characterized in that The rotating shaft (8) includes a middle shaft and two end shafts at both ends thereof, and the middle shaft and the end shafts are connected via flanges (21).

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