A material screening device for coal mines

Abstract

This invention relates to the field of screening device manufacturing technology, and more particularly to a material screening device for coal mines. A material screening device for coal mines includes a feeding device, a screening device, a conveying device, and a casing. The screening device and the conveying device are arranged vertically within the housing space of the casing. One end of the casing has a screening inlet, and the other end has a screening outlet and a conveying outlet arranged vertically. The outlet of the feeding device is connected and communicates with the screening inlet, and the feeding port of the feeding device is located away from the casing. The screening device receives the material to be screened input from the screening inlet, and the material to be screened includes a first material and a second material, wherein the particle size of the first material is larger than that of the second material. By installing the feeding device on the casing and integrating the screening device and the conveying device within the casing, the functions of feeding, screening, and conveying are integrated into one unit, improving space utilization.

Description

Technical Field

[0001] This invention relates to the field of screening device manufacturing technology, and in particular to a material screening device for coal mines. Background Technology

[0002] Screening is an indispensable and crucial step in mining and processing. Its core function is to classify the mined lumpy materials according to particle size, providing qualified materials for subsequent crushing, washing, and transportation processes, while removing unqualified materials (such as large pieces of gangue), ensuring the normal operation of subsequent processes. Roller screens, as a commonly used screening equipment, are widely used in the mining industry due to their advantages such as high screening efficiency, low material breakage rate, stable operation, and convenient maintenance.

[0003] Currently, the common operating mode of existing roller screens used in mines is a combination of "independent feeder + independent roller screen + independent conveyor". That is, the material to be screened is transported to the feed end of the roller screen by a separately configured feeder. After being classified by the roller screen, the material of different particle size grades is then transported to the designated location by the subsequent conveyor.

[0004] However, existing screening methods require separate configuration of auxiliary equipment such as feeders and conveyors. Sufficient installation space and material conveying channels need to be reserved between each piece of equipment, resulting in a large footprint for the entire screening system. This is especially problematic in confined spaces such as underground coal mine chambers, where equipment layout becomes extremely difficult and may even fail to meet installation requirements. Furthermore, the connections between different pieces of equipment require additional laying of conveying pipelines or tracks, further increasing the complexity and workload of equipment installation. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a material screening equipment for coal mines, which solves the technical problems of existing material screening methods that use independent auxiliary equipment such as feeders, roller screens, and conveyors, which occupy a large space, are cumbersome and complicated to install, and increase the amount of installation work.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] This invention provides a material screening device for coal mines, including a feeding device, a screening device, a conveying device, and a casing. The casing has a receiving space, within which the screening device and the conveying device are arranged vertically. One end of the casing has a screening inlet, and the other end has a screening outlet and a conveying outlet arranged vertically. The outlet of the feeding device is connected to and communicates with the screening inlet, and the feeding outlet is located away from the casing. The screening device receives the material to be screened from the screening inlet, and the material to be screened includes a first material and a second material. The particle size of the first material is larger than that of the second material. The screening device can transport the first material from the end near the feeding device to the screening outlet, and the screening device can screen the second material onto the conveying device. The conveying device transports the second material from the end near the feeding device to the conveying outlet.

[0010] Preferably, the screening device includes a drive component, a first transmission mechanism, and multiple rollers; the multiple rollers extend horizontally along the width direction of the housing and are arranged horizontally at intervals along the length direction of the housing, and the two ends of the multiple rollers are rotatably connected to the two sides of the housing respectively; each roller has helical screen teeth on its outer wall, the helical direction of the multiple screen teeth is consistent, the screen teeth are coaxial with the roller, and the screen teeth on adjacent rollers are staggered and have gaps; the first transmission mechanism is installed at the same end of the multiple rollers, the fixed end of the drive component is fixedly installed on the outer wall of the housing, and the driving end of the drive component is connected to the multiple rollers through the first transmission mechanism; the driving end of the drive component can drive the multiple rollers to rotate synchronously around their own axis through the first transmission mechanism to screen the material to be screened.

[0011] Preferably, the first transmission mechanism includes a first driving wheel, a first transmission belt, and a plurality of first driven wheels; the first driving wheel is fixedly connected to one end of the roller near the feeding device, and the first driving wheel is coaxial with the roller; the driving end of the driving member is connected to the first driving wheel; the plurality of first driven wheels are respectively connected to the ends of the plurality of other rollers facing the first driving wheel, and each first driven wheel is coaxial with the corresponding roller; the first transmission belt is sleeved on the outer wall of the first driving wheel and the plurality of first driven wheels; the driving member can drive the first driving wheel to rotate, so as to drive the plurality of first driven wheels to rotate synchronously through the first transmission belt, thereby driving the plurality of rollers to rotate synchronously.

[0012] Preferably, each of the sieve teeth has multiple grooves on its outer wall, and the multiple grooves are spaced apart along the spiral line of the sieve teeth.

[0013] Preferably, the feeding device includes a housing, a second transmission mechanism, and multiple spiral feed rods; the housing includes an inclined section and a vertical section, one end of the inclined section is a discharge port connected to and communicating with the screening inlet, the other end of the inclined section is inclined upward away from the housing, one end of the vertical section is connected to the end of the inclined section away from the housing, and the other end of the vertical section is the feed port; the multiple spiral feed rods extend inclinedly along the inclined direction of the inclined section, and the multiple spiral feed rods are arranged horizontally at intervals along the width of the inclined section, and both ends of each spiral feed rod are rotatably installed in the inclined section through a connecting plate; the second transmission mechanism is installed in the housing, and the driving end of the driving member is connected to the multiple spiral feed rods through the second transmission mechanism to drive the multiple spiral feed rods to rotate synchronously around their own axis, so as to convey the material to be screened to the screening device.

[0014] Preferably, the second transmission mechanism includes a second driven wheel, a rotating rod, a second transmission belt, a plurality of first bevel gears, and a plurality of second bevel gears; the rotating rod extends along the width direction of the housing, with both ends rotatably connected to the housing, and the end of the rotating rod facing the driving member is connected to the second driven wheel; a second driving wheel is also connected between the driving member and the first driving wheel, and the second driving wheel is coaxially arranged with the first driving wheel; the second transmission belt is sleeved on the outer wall of the second driving wheel and the second driven wheel; the plurality of first bevel gears correspond one-to-one with the ends of the plurality of spiral feed rods facing the discharge port. The connection is as follows: each of the first bevel gears is aligned with the axis of its corresponding spiral feed rod; multiple second bevel gears are fixedly sleeved on the rotating rod and arranged at intervals along the axis of the rotating rod, the axis of the first bevel gear is perpendicular to the axis of the second bevel gear, and the multiple second bevel gears mesh with the multiple first bevel gears in a one-to-one correspondence; the driving end of the driving member can drive the second driving wheel to rotate, so as to drive the second driven wheel, the rotating rod and the multiple second bevel gears to rotate synchronously on their own axes through the second transmission belt, thereby driving the multiple first bevel gears and the multiple spiral feed rods to rotate synchronously on their own axes.

[0015] Preferably, the pitch of the screw feeder from the middle to the end facing the feed port is smaller than the pitch of the screw feeder from the middle to the end facing the discharge port, so as to slow down the speed of the material to be screened entering from the feed port.

[0016] Preferably, a grid is horizontally installed at the feed inlet for screening the material to be screened entering the feed inlet.

[0017] Preferably, the material screening equipment further includes a cleaning device, which includes a lifting mechanism and a cleaning mechanism; the cleaning mechanism is horizontally placed inside the casing and located above the screening device; the lifting mechanism is vertically arranged, and the fixed end of the lifting mechanism is fixedly installed on the top of the casing, and the lifting end of the lifting mechanism passes through the top of the casing and connects to the cleaning mechanism; the lifting end of the lifting mechanism can drive the cleaning mechanism to descend vertically to contact the rollers, so as to clean the multiple rollers and the multiple screen teeth.

[0018] Preferably, the lifting mechanism includes multiple hydraulic cylinders; the cleaning mechanism includes a mounting frame and multiple brushes, the mounting frame is horizontally arranged, the multiple brushes are fixedly connected to the mounting frame, the multiple brushes are horizontally spaced along the length of the housing and correspond one-to-one with the multiple rollers, and each brush extends along the width of the housing; the multiple hydraulic cylinders are vertically arranged and extend along the length of the housing, the fixed end of each hydraulic cylinder is connected to the top of the housing, and the telescopic end of each hydraulic cylinder passes through the top of the housing and connects to the mounting frame; the fixed end of the hydraulic cylinder is the fixed end of the lifting mechanism, and the telescopic end of the hydraulic cylinder is the lifting end of the lifting mechanism; during cleaning, the telescopic ends of the multiple hydraulic cylinders are driven to extend synchronously, so as to drive the mounting frame and the multiple brushes to move synchronously toward the multiple rollers until they contact each other one-to-one, and the multiple rollers can rotate simultaneously, so that the brushes clean the rollers and the screen teeth.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this invention are:

[0021] This invention discloses a material screening device for coal mines. By installing a feeding device on the machine casing, the screening device and conveying device are integrated and installed within the casing's accommodating space, with the screening device positioned above the conveying device. The material to be screened enters through the feeding port, is released from the discharge port by the feeding device, and is received by the screening device through the screening inlet. The screening device then screens the material to be screened, allowing the second material to be screened onto the conveying device and output from the conveying outlet to other equipment for further processing. The first material is conveyed from the screening outlet by the screening device to other equipment for further processing. This achieves integrated feeding, screening, and conveying functions, effectively integrating the feeder, roller screen, and conveyor into one unit. Compared to the separate feeder, roller screen, and conveyor in existing technologies, this invention prevents space waste caused by the dispersed arrangement of equipment, significantly improves space utilization, and greatly reduces the footprint of the entire material screening equipment, making it particularly suitable for the confined spaces of underground coal mines. At the same time, it can eliminate the need for additional conveying pipelines or tracks between various devices, which not only reduces the complexity and workload of equipment installation, but also reduces the time and cost of installation and construction. It also avoids potential hazards such as material leakage and loose equipment connections caused by improper pipeline or track laying, reduces the difficulty of maintenance after equipment installation, and improves the installation convenience and operational stability of the entire screening equipment. This ensures that subsequent crushing, washing and other processes can obtain materials with qualified particle sizes, and guarantees the normal operation of subsequent processes. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a material screening device for coal mines according to the present invention;

[0023] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the splitter shell and outer shell of a material screening device for coal mines according to the present invention.

[0025] Figure 4 This is a schematic diagram of the overall three-dimensional disassembly structure of the feeding device of a material screening equipment for coal mines according to the present invention;

[0026] Figure 5 This is a schematic diagram of the overall three-dimensional structure of the screening device of a coal mine material screening equipment according to the present invention;

[0027] Figure 6 This is a schematic diagram of the overall three-dimensional structure of the roller, screen teeth and first driven wheel of a material screening device for coal mines according to the present invention.

[0028] Figure 7This is a schematic diagram of the overall three-dimensional structure of the conveying device of a material screening equipment for coal mines according to the present invention;

[0029] Figure 8 This is a schematic cross-sectional view of a material screening device for coal mines according to the present invention.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Feeding device; 11: Outer casing; 111: Inclined section; 112: Vertical section; 12: Second transmission mechanism; 121: Second driven wheel; 122: Rotating rod; 123: Second transmission belt; 124: First bevel gear; 125: Second bevel gear; 126: Second driving wheel; 13: Spiral feed rod; 2: Screening device; 21: Driving component; 22: First transmission mechanism; 221: First driving wheel; 222: First transmission belt; 223: First driven wheel; 23: Roller; 24: Screen teeth; 241: Tooth groove; 3: Conveying device; 4: Machine casing; 41: Screening inlet; 42: Screening outlet; 43: Conveying outlet; 5: Grille; 6: Cleaning device; 61: Lifting mechanism; 611: Hydraulic cylinder; 62: Cleaning mechanism; 621: Mounting frame; 622: Brush; 7: Inclined plate; a: Discharge port; b: Feed port. Detailed Implementation

[0032] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0033] Example

[0034] This embodiment of a material screening equipment for coal mines includes a feeding device 1, a screening device 2, a conveying device 3, and a casing 4.

[0035] Specifically, the casing 4 has a receiving space, within which the screening device 2 and the conveying device 3 are arranged vertically. One end of the casing 4 has a screening inlet 41, and the other end has a screening outlet 42 and a conveying outlet 43 arranged vertically. The discharge port a of the feeding device 1 is connected to and communicates with the screening inlet 41, while the feed port b of the feeding device 1 is away from the casing 4. The screening device 2 receives the material to be screened from the screening inlet 41, and the material to be screened includes a first material and a second material. The particle size of the first material is larger than that of the second material. The screening device 2 can transport the first material from the end near the feeding device 1 to the screening outlet 42, and the screening device 2 can screen the second material onto the conveying device 3. The conveying device 3 is used to convey the second material from the end near the feeding device 1 to the conveying outlet 43.

[0036] By installing the feeding device 1 on the housing 4, the screening device 2 and the conveying device 3 are integrated and installed within the housing 4's accommodating space, with the screening device 2 positioned above the conveying device 3. The material to be screened enters through the feeding port b, is released from the discharge port a via the feeding device 1, and is received by the screening device 2 through the screening inlet 41. The screening device 2 then screens the material to be screened, allowing the second material to be screened onto the conveying device 3 and output from the conveying outlet 43 to other equipment for further processing. The first material is conveyed by the screening device 2 and output from the screening outlet 42 to other equipment for further processing. This achieves integrated feeding, screening, and conveying functions, effectively integrating the feeder, roller screen 23, and conveyor into one unit. Compared to the separate feeder, roller screen 23, and conveyor in existing technologies, the material screening equipment in this embodiment prevents space waste caused by the dispersed arrangement of various devices, significantly improves space utilization, and greatly reduces the overall footprint of the material screening equipment, making it particularly suitable for the confined spaces of underground coal mines. At the same time, it can eliminate the need for additional conveying pipelines or tracks between various devices, which not only reduces the complexity and workload of equipment installation, but also reduces the time and cost of installation and construction. It also avoids potential hazards such as material leakage and loose equipment connections caused by improper pipeline or track laying, reduces the difficulty of maintenance after equipment installation, and improves the installation convenience and operational stability of the entire screening equipment. This ensures that subsequent crushing, washing and other processes can obtain materials with qualified particle sizes, and guarantees the normal operation of subsequent processes.

[0037] Furthermore, the screening device 2 includes a drive component 21, a first transmission mechanism 22, and multiple rollers 23. The multiple rollers 23 extend horizontally along the width direction of the housing 4 and are arranged horizontally at intervals along the length direction of the housing 4. Both ends of the multiple rollers 23 are rotatably connected to the two sides of the housing 4. Each roller 23 has helical screen teeth 24 on its outer wall. The helical direction of the multiple screen teeth 24 is consistent, and the screen teeth 24 are coaxial with the roller 23. The screen teeth 24 on adjacent rollers 23 are staggered and have gaps, so that the second material meeting the specifications can fall from the gaps onto the conveying device 3. The first transmission mechanism 22 is installed at the same end of the multiple rollers 23. The fixed end of the drive component 21 is fixedly installed on the outer wall of the housing 4, and the driving end of the drive component 21 is connected to the multiple rollers 23 via the first transmission mechanism 22. The driving end of the drive component 21 can drive the multiple rollers 23 to rotate synchronously around their own axes through the first transmission mechanism 22 to screen the material to be screened.

[0038] By designing the screen teeth 24 as a spiral shape and extending along the axis of the roller 23, the first material can smoothly roll along the length of the casing 4 towards the screening outlet 42 when the roller 23 rotates. This reduces the risk of equipment jamming and shutdown due to the first material getting stuck between the teeth, thus reducing the risk of material jamming. It also avoids the situation in existing roller 23 screens where disc teeth or straight teeth perpendicular to the roller 23 axis cause material to easily get stuck between adjacent teeth. Simultaneously, the staggered arrangement of adjacent screen teeth 24 forms a continuous screening space without obvious dead angles. Even if large pieces of gangue or other first materials enter, they can be pushed to the screening outlet 42 under the guidance of the spiral screen teeth 24, preventing the first material from getting stuck between adjacent screen teeth 24 and causing blockage, thereby improving screening efficiency and stability. Furthermore, the surface of the screen teeth 24 can be provided with anti-slip textures, which can increase the friction between the material to be screened and the screen teeth 24, reducing the probability of the material slipping during screening and improving screening efficiency.

[0039] Furthermore, each screen tooth 24 has multiple grooves 241 on its outer wall. These grooves 241 are spaced apart along the spiral line of the screen tooth 24. This enhances the gripping and combing effect of the screen tooth 24 on the material, enabling rapid screening and conveying of the material to be screened. It also prevents the material from slipping and accumulating on the surface of the screen tooth 24, thus avoiding a decrease in screening efficiency. Furthermore, it prevents the first material from getting stuck on the screen tooth 24 and affecting the normal operation of the equipment, reducing the probability of the first material clogging the screen tooth 24. At the same time, it further improves the separation effect between the second material and the first material, ensuring screening accuracy.

[0040] Furthermore, the first transmission mechanism 22 includes a first driving wheel 221, a first transmission belt 222, and a plurality of first driven wheels 223. The first driving wheel 221 is fixedly connected to one end of the roller 23 near the feeding device 1 via a coupling, and the first driving wheel 221 is coaxial with the roller 23. The driving end of the driving member 21 is connected to the first driving wheel 221. The plurality of first driven wheels 223 are respectively connected to the ends of the plurality of other rollers 23 facing the first driving wheel 221 via couplings, and each first driven wheel 223 is coaxial with the corresponding roller 23. The first transmission belt 222 is sleeved on the outer wall of the first driving wheel 221 and the plurality of first driven wheels 223. The driving component 21 can drive the first driving wheel 221 to rotate, so that the first driving belt 222 drives multiple first driven wheels 223 to rotate synchronously, thereby driving multiple rollers 23 to rotate synchronously. This ensures that the rotation speed of each roller 23 is consistent during the screening process, avoiding problems such as the first material conveying deviation and uneven screening effect of the material to be screened caused by the different rotation speeds of individual rollers 23. It also prevents the first transmission mechanism 22 from jamming and affecting the operation of the material screening equipment, and reduces the failure rate of the first transmission mechanism 22.

[0041] Furthermore, the feeding device 1 includes a housing 11, a second transmission mechanism 12, and a plurality of screw feed rods 13. The housing 11 includes an inclined section 111 and a vertical section 112. One end of the inclined section 111 is a discharge port a, which is connected and communicates with the screening inlet 41. The other end of the inclined section 111 is inclined upward in a direction away from the housing 4. One end of the vertical section 112 is connected and communicates with the end of the inclined section 111 away from the housing 4, and the other end of the vertical section 112 is a feed port b. The plurality of screw feed rods 13 extend inclinedly along the inclined direction of the inclined section 111, and the plurality of screw feed rods 13 are arranged horizontally at intervals along the width of the inclined section 111. Both ends of each screw feed rod 13 are rotatably installed in the inclined section 111 through a connecting plate. The second transmission mechanism 12 is installed inside the housing 4. The driving end of the drive component 21 is connected to multiple screw feed rods 13 through the second transmission mechanism 12, so as to drive the multiple screw feed rods 13 to rotate synchronously around their own axes, thereby conveying the material to be screened to the screening device 2. This achieves stable and uniform feeding of the material to be screened, allowing the material to enter the screening device 2 in an orderly manner. It avoids overloading of the screening device 2 and incomplete screening caused by feeding too fast, and prevents the material to be screened from spilling and accumulating during the feeding process, reducing material waste and equipment failure risk. At the same time, using the same drive component 21 to drive the feeding device 1 and the screening device 2 simplifies the equipment structure and reduces equipment energy consumption and manufacturing costs.

[0042] Furthermore, both the inner walls of the housing 4 and the outer shell 11 are provided with anti-stick and wear-resistant liners. The anti-stick and wear-resistant liners can be made of a composite material of polytetrafluoroethylene and wear-resistant rubber with a thickness of 10mm-15mm. They can prevent the material to be screened from adhering to the inner walls of the housing 4 and the outer shell 11, avoiding material blockage, and can also enhance the wear resistance of the housing 4 and the outer shell 11, extending their service life.

[0043] Furthermore, the second transmission mechanism 12 includes a second driven wheel 121, a rotating rod 122, a second transmission belt 123, a plurality of first bevel gears 124, and a plurality of second bevel gears 125. The rotating rod 122 extends along the width direction of the housing 4, and its two ends are rotatably connected to the housing 4. The end of the rotating rod 122 facing the driving member 21 is connected to the second driven wheel 121. A second driving wheel 126 is also connected between the driving member 21 and the first driving wheel 221. The second driving wheel 126 is coaxially arranged with the first driving wheel 221. The second transmission belt 123 is sleeved on the outer wall of the second driving wheel 126 and the second driven wheel 121. The plurality of first bevel gears 124 are respectively connected one-to-one to the ends of the plurality of screw feed rods 13 facing the discharge port a, and the axis of each first bevel gear 124 is aligned with the axis of its corresponding screw feed rod 13. Multiple second bevel gears 125 are fixedly sleeved on the rotating rod 122 and arranged at intervals along the axis of the rotating rod 122. The axis of the first bevel gear 124 is perpendicular to the axis of the second bevel gear 125, and the multiple second bevel gears 125 mesh with the multiple first bevel gears 124 in a one-to-one correspondence. The driving end of the driving member 21 can drive the second driving wheel 126 to rotate, so as to drive the second driven wheel 121, the rotating rod 122 and the multiple second bevel gears 125 to rotate synchronously around their own axes through the second transmission belt 123, thereby driving the multiple first bevel gears 124 and the multiple screw feed rods 13 to rotate synchronously around their own axes. This ensures that the multiple screw feed rods 13 and the multiple rollers 23 rotate synchronously, reducing energy consumption and energy waste, and making the structure of the material screening equipment more compact, further saving installation space.

[0044] Furthermore, the pitch of the screw feeder 13 from its middle section to the end facing the feed inlet b is smaller than the pitch from its middle section to the end facing the discharge outlet a. This slows down the speed of the material to be screened entering from the feed inlet b, achieving buffered feeding of the material and preventing a decrease in screening accuracy caused by the rapid entry of the material into the screening device 2, thus further improving screening efficiency and effect. Simultaneously, it also prevents the material to be screened from rapidly entering from the screening inlet 41 and damaging the roller 23 and screen teeth 24, reducing the wear rate of the screen teeth 24 and roller 23. Additionally, the spiral blades of the screw feeder 13 can be made of wear-resistant alloy material, with a wear-resistant ceramic coating on the surface of the blades, with a thickness of 0.8mm-1.2mm. This effectively enhances the wear resistance of the blades, extends the service life of the screw feeder 13, and is suitable for conveying high-hardness, large-piece materials in mines.

[0045] It should be noted that the drive component 21 in this embodiment can be a variable frequency speed control motor of model YVP225M-4 with a power of 37kW and a speed adjustable between 0r / min and 1480r / min. It is electrically connected to the control system through a frequency converter. The control system can adjust the speed of the main motor according to the feeding and screening requirements, thereby adjusting the rotation speed of the roller 23 and the conveying speed of the screw feed rod 13, so as to achieve precise matching between the feeding amount and the screening capacity, and achieve the purpose of energy saving and consumption reduction.

[0046] Furthermore, a grid 5 is horizontally installed at feed port b to screen the material to be screened before it enters feed port b. This preliminary screening removes oversized materials before they enter feed device 1, preventing jamming and damage caused by oversized materials entering feed device 1 and screening device 2. This ensures the normal and stable operation of the material screening equipment and reduces wear and maintenance costs. Of course, if oversized materials are blocked by grid 5 and remain on it, to ensure that compliant materials can enter feed port b, the oversized materials can be pushed off grid 5 using rollers or other equipment to prevent blockage.

[0047] Furthermore, the material screening equipment also includes a cleaning device 6, which comprises a lifting mechanism 61 and a cleaning mechanism 62. The cleaning mechanism 62 is horizontally positioned inside the casing 4 and above the screening device 2. The lifting mechanism 61 is vertically positioned, with its fixed end fixedly installed on the top of the casing 4. The lifting end of the lifting mechanism 61 passes through the top of the casing 4 and connects to the cleaning mechanism 62. The lifting end of the lifting mechanism 61 can drive the cleaning mechanism 62 to descend vertically to contact the rollers 23, thereby cleaning the multiple rollers 23 and multiple screen teeth 24. This prevents secondary material residue from adhering to the surfaces of the rollers 23 and screen teeth 24, thus avoiding a decrease in screening accuracy. It also prevents secondary material from agglomerating and adhering to the surfaces of the rollers 23 and screen teeth 24, affecting the operational stability of the screening device 2. Furthermore, it reduces the labor intensity of manual cleaning and extends the service life of the rollers 23 and screen teeth 24.

[0048] Furthermore, the lifting mechanism 61 includes multiple hydraulic cylinders 611. The cleaning mechanism 62 includes a mounting frame 621 and multiple brushes 622. The mounting frame 621 is horizontally arranged, and the multiple brushes 622 are all fixedly connected to the mounting frame 621. The multiple brushes 622 are arranged horizontally at intervals along the length of the housing 4 and correspond one-to-one with the multiple rollers 23. Each brush 622 extends along the width of the housing 4, thereby enabling simultaneous cleaning of the multiple rollers 23 and the screen teeth 24 on them. The multiple hydraulic cylinders 611 are all vertically arranged and extend along the length of the housing 4. The fixed end of each hydraulic cylinder 611 is connected to the top of the housing 4, and the telescopic end of each hydraulic cylinder 611 passes through the top of the housing 4 and connects to the mounting frame 621. The fixed end of the hydraulic cylinder 611 is the fixed end of the lifting mechanism 61, and the telescopic end of the hydraulic cylinder 611 is the lifting end of the lifting mechanism 61. During cleaning, the telescopic ends of multiple hydraulic cylinders 611 extend synchronously, driving the mounting frame 621 and multiple brushes 622 to move synchronously towards the multiple rollers 23 until they contact each other in a one-to-one manner. The multiple rollers 23 rotate simultaneously, allowing the brushes 622 to clean the rollers 23 and the screen teeth 24. By setting up multiple hydraulic cylinders 611, mounting frames 621, and multiple brushes 622, with each brush corresponding to one of the rollers 23, and the hydraulic cylinders 611 driving the mounting frame 621 and brushes 622 to contact the rollers 23, the cleaning is completed in coordination with the rotation of the rollers 23. This achieves synchronous and comprehensive cleaning of the multiple rollers 23 and the screen teeth 24, avoiding secondary material residue caused by incomplete cleaning, preventing a single roller 23 from being insufficiently cleaned and affecting the overall screening effect, thus improving cleaning efficiency.

[0049] It should be noted that the brush 622 in this embodiment uses hard material bristles, such as high-hardness nylon filaments, with moderate hardness (Shore hardness 75-85D), wear-resistant, anti-aging, and not easy to break. It can effectively clean coal slime and small gangue residues in the gaps between the screen teeth 24 without damaging the roller 23 and the surface of the screen teeth 24. At the same time, it has a certain degree of antistatic properties to avoid dust accumulation and is suitable for the dusty environment in underground coal mines.

[0050] Furthermore, the conveying device 3 adopts a conveyor belt as in the prior art. It drives the active roller to rotate via a motor, thereby driving multiple driven rollers to rotate simultaneously via a transmission belt, thus realizing the conveying of the conveyor belt. Of course, in this embodiment, the transmission of the first transmission mechanism 22, the second active wheel 126 and the second driven wheel 121 and the conveying of the conveyor belt can also be achieved by using sprockets and chains, which is the prior art. Plate chains can be used, and the sprockets are made of wear-resistant cast steel with surface quenching treatment to achieve a hardness of HRC45-50, which can effectively extend the service life of the first transmission mechanism 22 and the second transmission mechanism 12. This will not be elaborated here.

[0051] Based on the above structure, the working principle of a coal mine material screening device in this embodiment is as follows:

[0052] First, the drive unit 21 is activated. The drive end of the drive unit 21 drives the first drive wheel 221 and the second drive wheel 126 connected to it to rotate synchronously. This, in turn, drives multiple first driven wheels 223 and rotating rods 122 to rotate synchronously via the first transmission belt 222 and the second transmission belt 123, causing multiple rollers 23, multiple second bevel gears 125, multiple first bevel gears 124, and multiple spiral feed rods 13 to rotate synchronously. The first transmission belt 222 is fitted onto the outer wall of the first drive wheel 221 and the multiple first driven wheels 223. The first drive wheel 221 drives the multiple first driven wheels 223 to rotate synchronously via the first transmission belt 222, which in turn drives the multiple rollers 23 to rotate synchronously around their own axes, with the rotation direction and speed of the multiple rollers 23 being consistent. Simultaneously, the second transmission belt 123 is fitted onto the outer wall of the second drive wheel 126 and the second driven wheel 121. The second drive wheel 126 drives the second driven wheel 121 to rotate synchronously via the second transmission belt 123, which in turn drives the rotating rods 122 to rotate synchronously. Because multiple second bevel gears 125 are fixedly sleeved on the outer wall of the rotating rod 122, and each of the multiple second bevel gears 125 meshes with a corresponding multiple first bevel gears 124, and the first bevel gears 124 are correspondingly connected to the end of the screw feed rod 13 facing the discharge port a and keep their axes aligned, the rotating rod 122 drives the multiple second bevel gears 125 to rotate synchronously, and the second bevel gears 125 in turn drive the corresponding first bevel gears 124 to rotate synchronously, ultimately driving the multiple screw feed rods 13 to rotate synchronously around their own axes. Simultaneously with starting the driving component 21, the conveying device 3 is also started.

[0053] After all devices reach a stable operating state, the material to be screened is fed into the feed port b of the feeding device 1. The material first passes through the grid 5 at the feed port b, completing the preliminary screening, and then enters the outer shell 11 of the feeding device 1. The material entering the outer shell 11 falls onto multiple screw feed rods 13 and is conveyed as the screw feed rods 13 rotate. Since the pitch from the middle of the screw feed rod 13 to the end of the feed port b is smaller than the pitch from the middle to the end of the discharge port a, the material to be screened is slowly conveyed to the discharge port a of the feeding device 1, and then falls onto the screening device 2 through the screening inlet 41 of the casing 4. The material falling onto the screening device 2 comes into contact with the synchronously rotating roller 23 and the spiral screen teeth 24 on the outer wall of the roller 23. When roller 23 rotates, screen teeth 24 rotate synchronously with roller 23. The first material rolls along the length of the casing 4 under the action of screen teeth 24 (of course, some of the first material will roll towards one side of the casing 4 due to the spiral shape of screen teeth 24, but the limiting effect of casing 4 and the rotation of multiple rollers 23 and screen teeth 24 will also cause the material to roll along the length of casing 4). The second material falls onto the conveying device 3 below through the gap between adjacent screen teeth 24. The first material continues to move along screen teeth 24 to the screening outlet 42 of casing 4 and is output to other equipment. The second material falling onto the conveying device 3 is conveyed to the conveying outlet 43 of casing 4 by the conveying device 3 and output to other equipment, completing the grading and screening of the material to be screened. After the material screening equipment has been running for a period of time, the material to be screened is stopped from being fed into the feed port b. The cleaning device 6 is started, which drives multiple hydraulic cylinders 611 to extend synchronously, driving the mounting frame 621 and multiple brushes 622 on the mounting frame 621 to descend synchronously, so that multiple brushes 622 contact multiple rollers 23 one by one. At this time, the rollers 23 continue to rotate, and the brushes 622 clean the second material residue on the surface of the rollers 23 and in the gap between the screen teeth 24.

[0054] After cleaning is completed, multiple hydraulic cylinders 611 retract synchronously, driving the mounting frame 621 and brush 622 to rise and reset, allowing the material screening equipment to continue screening operations.

[0055] Furthermore, inclined plates 7 extending along the width direction of the casing 4 are provided at both the screening outlet 42 and the conveying outlet 43. Both inclined plates 7 are inclined downward in a direction away from the screening device 2, thereby guiding the first material and the second material output from the screening outlet 42 and the conveying outlet 43, so that the first material and the second material can be output to other equipment respectively.

[0056] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is 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," or "beneath" the second feature can mean that the first feature is 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.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A material screening device for coal mines, characterized in that, It includes a feeding device (1), a screening device (2), a conveying device (3), and a casing (4); The housing (4) has a receiving space inside. The screening device (2) and the conveying device (3) are arranged vertically in the receiving space of the housing (4). One end of the housing (4) is provided with a screening inlet (41), and the other end is provided with a screening outlet (42) and a conveying outlet (43) arranged vertically. The discharge port (a) of the feeding device (1) is connected and communicates with the screening inlet (41), and the feeding port (b) of the feeding device (1) is away from the casing (4). The screening device (2) is used to receive the material to be screened input from the screening inlet (41), and the material to be screened includes a first material and a second material. The particle size of the first material is larger than that of the second material. The screening device (2) can transport the first material from one end close to the feeding device (1) to the screening outlet (42). The screening device (2) can screen the second material onto the conveying device (3). The conveying device (3) is used to convey the second material from one end near the feeding device (1) to the conveying outlet (43).

2. The coal mine material screening equipment as described in claim 1, characterized in that: The screening device (2) includes a drive unit (21), a first transmission mechanism (22) and multiple rollers (23); The plurality of rollers (23) extend horizontally along the width direction of the housing (4) and are arranged horizontally at intervals along the length direction of the housing (4), and the two ends of the plurality of rollers (23) are rotatably connected to the two sides of the housing (4); Each roller (23) has a spiral sieve tooth (24) on its outer wall. The spiral direction of the multiple sieve teeth (24) is consistent. The sieve teeth (24) are coaxial with the roller (23), and the sieve teeth (24) on two adjacent rollers (23) are staggered and have gaps. The first transmission mechanism (22) is installed at the same end of the plurality of rollers (23), and the fixed end of the driving member (21) is fixedly installed on the outer wall of the housing (4). The driving end of the driving member (21) is connected to the plurality of rollers (23) through the first transmission mechanism (22). The driving end of the driving component (21) can drive multiple rollers (23) to rotate synchronously around their own axis through the first transmission mechanism (22) to screen the material to be screened.

3. The coal mine material screening equipment as described in claim 2, characterized in that: The first transmission mechanism (22) includes a first driving pulley (221), a first transmission belt (222) and a plurality of first driven pulleys (223); The first drive wheel (221) is fixedly connected to one end of the roller (23) near the feeding device (1), and the first drive wheel (221) is coaxial with the roller (23). The drive end of the drive member (21) is connected to the first drive wheel (221). Multiple first driven wheels (223) are respectively connected to one end of multiple other rollers (23) facing the first driving wheel (221), and each first driven wheel (223) is coaxial with the corresponding roller (23); The first transmission belt (222) is sleeved on the outer wall of the first driving pulley (221) and the plurality of first driven pulleys (223); The driving component (21) can drive the first driving wheel (221) to rotate, thereby driving multiple first driven wheels (223) to rotate synchronously via the first transmission belt (222), thereby driving multiple rollers (23) to rotate synchronously.

4. The coal mine material screening equipment as described in claim 2, characterized in that: Each of the sieve teeth (24) has multiple grooves (241) on its outer wall, and the multiple grooves (241) are spaced apart along the spiral line of the sieve teeth (24).

5. The coal mine material screening equipment as described in claim 3, characterized in that: The feeding device (1) includes a housing (11), a second transmission mechanism (12), and multiple screw feed rods (13). The outer casing (11) includes an inclined section (111) and a vertical section (112). One end of the inclined section (111) is a discharge port (a), which is connected and communicates with the screening inlet (41). The other end of the inclined section (111) is inclined upward in a direction away from the casing (4). One end of the vertical section (112) is connected to the end of the inclined section (111) away from the casing (4). The other end of the vertical section (112) is the feed port (b). The plurality of the spiral feed rods (13) extend obliquely along the oblique direction of the inclined section (111), and the plurality of the spiral feed rods (13) are arranged horizontally at intervals along the width of the inclined section (111). Both ends of each spiral feed rod (13) are rotatably installed in the inclined section (111) through a connecting plate. The second transmission mechanism (12) is installed inside the housing (4). The driving end of the driving member (21) is connected to the multiple screw feed rods (13) through the second transmission mechanism (12) to drive the multiple screw feed rods (13) to rotate synchronously around their own axis, so as to transport the material to be screened to the screening device (2).

6. The coal mine material screening equipment as described in claim 5, characterized in that: The second transmission mechanism (12) includes a second driven wheel (121), a rotating rod (122), a second transmission belt (123), a plurality of first bevel gears (124) and a plurality of second bevel gears (125). The rotating rod (122) extends along the width direction of the housing (4), and its two ends are rotatably connected to the housing (4). The end of the rotating rod (122) facing the driving member (21) is connected to the second driven wheel (121). A second driving wheel (126) is also connected between the driving member (21) and the first driving wheel (221). The second driving wheel (126) is coaxially arranged with the first driving wheel (221). The second transmission belt (123) is sleeved on the outer wall of the second driving wheel (126) and the second driven wheel (121). Multiple first bevel gears (124) are respectively connected to one end of multiple spiral feed rods (13) facing the discharge port (a), and each first bevel gear (124) is aligned with the axis of its corresponding spiral feed rod (13); Multiple second bevel gears (125) are fixedly sleeved on the rotating rod (122) and arranged at intervals along the axis of the rotating rod (122). The axis of the first bevel gear (124) is perpendicular to the axis of the second bevel gear (125), and multiple second bevel gears (125) mesh with multiple first bevel gears (124) in a one-to-one correspondence. The driving end of the driving member (21) can drive the second driving wheel (126) to rotate, so as to drive the second driven wheel (121), the rotating rod (122) and the multiple second bevel gears (125) to rotate synchronously on their own axes through the second transmission belt (123), thereby driving the multiple first bevel gears (124) and the multiple spiral feed rods (13) to rotate synchronously on their own axes.

7. The coal mine material screening equipment as described in claim 5, characterized in that: The pitch of the screw feed rod (13) from the middle to the end facing the feed port (b) is smaller than the pitch of the screw feed rod (13) from the middle to the end facing the discharge port (a) to slow down the speed of the material to be screened entering from the feed port (b).

8. The coal mine material screening equipment as described in claim 3, characterized in that: A grid (5) is horizontally installed at the feed port (b) for screening the material to be screened that enters the feed port (b).

9. The coal mine material screening equipment as described in claim 2, characterized in that: The material screening equipment also includes a cleaning device (6), which includes a lifting mechanism (61) and a cleaning mechanism (62). The cleaning mechanism (62) is horizontally placed inside the housing (4) and above the screening device (2); The lifting mechanism (61) is vertically arranged, and the fixed end of the lifting mechanism (61) is fixedly installed on the top of the housing (4). The lifting end of the lifting mechanism (61) passes through the top of the housing (4) and is connected to the cleaning mechanism (62). The lifting end of the lifting mechanism (61) can drive the cleaning mechanism (62) to descend vertically to contact the roller (23) in order to clean the multiple rollers (23) and the multiple sieve teeth (24).

10. The coal mine material screening equipment as described in claim 9, characterized in that: The lifting mechanism (61) includes multiple hydraulic cylinders (611). The cleaning mechanism (62) includes a mounting frame (621) and a plurality of brushes (622). The mounting frame (621) is horizontally arranged, and the plurality of brushes (622) are fixedly connected to the mounting frame (621). The plurality of brushes (622) are arranged horizontally at intervals along the length direction of the housing (4) and correspond one-to-one with the plurality of rollers (23). Each brush (622) extends along the width direction of the housing (4). The plurality of hydraulic cylinders (611) are all vertically arranged and extend along the length of the housing (4). The fixed end of each hydraulic cylinder (611) is connected to the top of the housing (4), and the telescopic end of each hydraulic cylinder (611) passes through the top of the housing (4) and is connected to the mounting bracket (621). The fixed end of the hydraulic cylinder (611) is the fixed end of the lifting mechanism (61), and the telescopic end of the hydraulic cylinder (611) is the lifting end of the lifting mechanism (61). During cleaning, the telescopic ends of the multiple hydraulic cylinders (611) can extend synchronously to drive the mounting bracket (621) and the multiple brushes (622) to move synchronously toward the multiple rollers (23) to contact each of the multiple rollers (23) in a one-to-one correspondence, and the multiple rollers (23) can rotate simultaneously so that the brushes (622) clean the rollers (23) and the sieve teeth (24).

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