Constant coal feeder capable of screening coal in real time
By adjusting the inner diameter of the screen cage through the synchronous counter-rotating screening rollers, the problem of frequent disassembly and replacement of existing coal screening equipment is solved, and the rapid screening of coal of multiple specifications is achieved, the screening efficiency and the adaptability of the production line are improved, and the cost is reduced.
Patent Information
- Application Number
- CN202511205409.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2025-10-10
AI Technical Summary
The screen cage of existing coal screening equipment has a fixed-caliber structure, which requires frequent disassembly and replacement. It is inefficient, costly, and has poor adaptability, and cannot quickly respond to the needs of small-batch, multi-specification coal screening.
The inner diameter of the screen cage is dynamically adjusted by using synchronously counter-rotating screen rollers. The inner diameter of the screen cage can be continuously adjusted through the synchronous counter-rotation of the left and right screen cage bodies, forming a gradient screening structure and improving screening efficiency and adaptability.
It realizes dynamic adjustment of the screening process, improves the flexibility and efficiency of the production line, reduces downtime and inventory costs, and reduces the risk of equipment damage.
Smart Images
Figure CN120755089A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coal conveying and screening, in particular to a constant coal feeder for real-time coal screening. Background Art
[0002] In the coal washing process, screening is one of the key links, used to separate coal of different particle sizes to meet the needs of subsequent processes (such as thermal coal sorting, coking coal grading, etc.). At present, the screen cages widely used in existing screening equipment are mostly fixed-caliber structures, and their screening inner diameter is determined at the factory or during installation. When it is necessary to screen coal of different particle sizes (such as switching from 30mm to 50mm), the machine must be shut down and the original screen cage must be disassembled and replaced with a new screen cage of corresponding specifications. This operation has the following defects:
[0003] Low efficiency: Replacing the screen cage requires multiple processes such as stopping the machine, removing bolts, and hoisting the new cage. A single switch takes a long time, seriously affecting the continuity of the production line;
[0004] High cost: It is necessary to stockpile various specifications of screen cage spare parts, resulting in high inventory and management costs;
[0005] Poor adaptability: For small-batch, multi-specification coal screening needs (such as pilot production or customized orders), fixed-caliber screen cages cannot respond quickly, resulting in waste of resources. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to provide a constant coal feeder for real-time screening of coal. The inner diameter of the screen cage is dynamically adjusted by the synchronously counter-rotating screening rollers, thereby solving the problem that the existing fixed-caliber screen cage needs to be frequently disassembled and replaced and has poor adaptability, and realizing rapid screening of coal of multiple specifications.
[0007] To achieve the above object, the present invention adopts the following technical solutions:
[0008] A constant coal feeder for real-time coal screening comprises a coal feeder and a conveying screen cage fixed to the left end of the coal feeder; the coal feeder comprises a machine base, a driving roller and a driven roller respectively mounted on the left and right ends of the machine base for longitudinal rotation, a conveyor belt circulating around the driving roller and the driven roller, and a motor fixed to the left end of the machine base for driving the driving roller to rotate;
[0009] The conveying screen cage includes a cage top, a cage bottom fixed below the cage top and connected to the cage top, a left screen cage body fixed below the left bottom of the cage bottom and connected to the cage bottom, and a right screen cage body fixed below the right bottom of the cage bottom and connected to the cage bottom; an entrance is opened on the side of the cage top, and an exit is opened below the left and right screen cage bodies;
[0010] The inner part of the cage bottom is longitudinally provided with a rotatable conveying roller, the surface of the conveying roller is connected with a plurality of circumferentially arrayed conveying plates, and the outer part of the cage bottom is fixed with a motor two for driving the conveying roller to rotate;
[0011] The inner part of the left and right sieve cages is longitudinally provided with two rotatable screening rollers, each of the screening rollers is connected with two circumferentially arrayed screening plates, the rear ends of the two screening rollers are coaxially connected with gears located outside the sieve cages and meshing with each other, and the front ends of any one of the screening rollers in the left and right sieve cages are respectively driven to rotate by a motor three fixed outside the sieve cages;
[0012] The two screening rollers in the left and right sieve cages are synchronously and reversely rotated under the driving of the motor three and the gear transmission, and the minimum distance between the two screening rollers in the left and right sieve cages is the real-time caliber of the respective cage.
[0013] By adopting the above scheme, the conveying sieve cage of the constant coal feeder adjusts the minimum distance through the two synchronously and reversely rotating screening rollers, realizes the continuous adjustment of the inner diameter of the sieve cage, does not need to be disassembled in the whole adjustment process, has shorter single switching time, and has higher production line adaptability.
[0014] As an optimal implementation manner of the constant coal feeder for real-time coal screening, the motor two drives the conveying roller to unidirectionally rotate from the left sieve cage to the right sieve cage, the real-time caliber in the left sieve cage is always smaller than that in the right sieve cage, a gradient screening structure of “preliminary screening → fine screening” is formed, the left sieve cage separates smaller size coal first, the right sieve cage further separates larger size coal, and thus the smaller size coal and the larger size coal are screened out, and the screening efficiency can be improved.
[0015] As an optimal implementation manner of the constant coal feeder for real-time coal screening, the inner part of the cage bottom is further fixed with two guide plates located on the left and right sides and simultaneously inclined and lowered towards the middle, the coal conveyed by the conveying roller can be concentrated and guided between the adjacent two screening plates of the screening roller, and thus the conveying efficiency is improved.
[0016] As an optimal implementation manner of the constant coal feeder for real-time coal screening, a plurality of reinforcing ribs are further connected between each adjacent two conveying plates and linearly arrayed along the axial direction of the conveying roller, the structural strength of the conveying plate is enhanced, and deformation or fracture caused by coal impact is prevented (especially suitable for large size coal screening scenes).
[0017] As an optimal implementation manner of the constant coal feeder for real-time coal screening, the thickness of the conveying plate and the screening plate gradually increases from the end part to the root part, a structure of “thin end part and thick root part” is formed, and the impact resistance of the root part is fully improved.
[0018] As a preferred embodiment of the constant coal feeder for real-time screening of coal, the coal feeder further comprises a plurality of supporting rollers which are longitudinally rotationally connected above the base and linearly arrayed along the conveying direction of the conveying belt; the upper surfaces of the supporting rollers are flush with the upper surfaces of the driving rollers and the driven rollers; this can effectively prevent the conveying belt from sagging due to the weight of coal, ensure smooth operation of the conveying belt, and avoid material scattering.
[0019] As a preferred embodiment of the constant coal feeder for real-time screening of coal, the coal feeder further comprises a tensioning assembly located below the base; the tensioning assembly comprises a tensioning roller one rotationally installed below the base, a tensioning roller two rotationally installed below the base, and a tensioning spring for pushing the tensioning roller two as a whole downward; the upper surface of the tensioning roller one is in contact with the conveying belt, and the lower surface of the tensioning roller two is in contact with the conveying belt; the spring elastic force is used to automatically compensate for the relaxation of the conveying belt, maintain constant tension, and prevent slipping.
[0020] As a preferred embodiment of the constant coal feeder for real-time screening of coal, the tensioning assembly further comprises two groups of anti-deviation rollers which are vertically arranged and rotationally installed on the base; the two groups of anti-deviation rollers are respectively located on the front and rear sides of the conveying belt and always limit the conveying belt between the two groups of anti-deviation rollers, so as to prevent the conveying belt from causing material jamming, screen cage blockage, or equipment damage due to deviation.
[0021] The beneficial effects of the present application are as follows:
[0022] 1. Dynamic adjustment with high flexibility: the conveying screen cage adjusts the minimum distance through two synchronously and reversely rotating screening rollers, realizes continuous adjustment of the inner diameter of the screen cage, does not need to be disassembled during the whole adjustment process, has shorter single switching time, and has higher production line adaptability.
[0023] 2. Gradient screening with improved efficiency: the conveying rollers cooperate with the "small inner diameter to large inner diameter" gradient structure of the left and right screen cage bodies to realize pre-screening and fine-screening classification of coal, so that smaller and larger size coal can be screened out, and the screening efficiency can be improved.
[0024] 3. Strong structure with high durability: the thickness gradient design and reinforcing rib arrangement of the material conveying plate and the screening plate effectively reduce the risk of component damage caused by high-density coal impact; the tensioning assembly and the anti-deviation rollers ensure long-term reliable operation of the conveying belt.
[0025] 4. Cost saving: no need to reserve multiple specifications of screen cage spare parts, reduce inventory cost, reduce downtime maintenance time, and indirectly improve economic benefits. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0027] Figure 1 A three-dimensional structural diagram of a constant coal feeder for real-time coal screening;
[0028] Figure 2 for Figure 1 The three-dimensional structure of the middle coal feeder Figure 1 ;
[0029] Figure 3 for Figure 1 The three-dimensional structure of the middle coal feeder Figure 2 ;
[0030] Figure 4 for Figure 1 Internal structure diagram of the middle coal feeder;
[0031] Figure 5 for Figure 1 Three-dimensional structure of the middle conveying screen cage Figure 1 ;
[0032] Figure 6 for Figure 1 Three-dimensional structure of the middle conveying screen cage Figure 2 ;
[0033] Figure 7 for Figure 1 Internal structure diagram of the middle conveying screen cage;
[0034] Figure 8 It is a three-dimensional structural diagram of the conveyor roller;
[0035] Figure 9 This is a three-dimensional structural diagram of the screening roller.
[0036] Figure markings: 1-coal feeder; 2-conveying screen cage; 3-machine base; 4-driving roller; 5-driven roller; 6-conveyor belt; 7-motor 1; 6-cage top; 7-cage bottom; 8-support roller; 9-tensioning assembly; 91-tensioning roller 1; 92-tensioning roller 2; 93-tensioning spring; 94-anti-skew roller; 10-cage top; 11-cage bottom; 12-left screen cage body; 13-right screen cage body; 14-conveying roller; 15-feeding plate; 16-motor 2; 17-screening roller; 18-screening plate; 19-gear; 20-motor 3; 21-guide plate; 22-reinforcement rib. DETAILED DESCRIPTION
[0037] With reference to the accompanying drawings: the specific embodiments of the present application will be described clearly and completely, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.
[0038] As shown in Figures 1 to 9 A constant coal feeder for real-time coal screening, which comprises a coal feeder 1 and a conveying sieve cage 2 fixed to the left end of the coal feeder 1; the coal feeder 1 comprises a base 3, a driving roller 4 and a driven roller 5 respectively longitudinally rotatably installed on the left and right ends of the base 3, a conveying belt 6 circulating around the driving roller 4 and the driven roller 5, and a motor one 7 fixed to the left end of the base 3 and driving the driving roller 4 to rotate; the conveying sieve cage 2 comprises a cage top 10, a cage bottom 11 fixed below the cage top 10 and communicating with the cage top 10, a left sieve cage body 12 fixed below the left end of the cage bottom 11 and communicating with the cage bottom 11, and a right sieve cage body 13 fixed below the right end of the cage bottom 11 and communicating with the cage bottom 11; the side of the cage top 10 is provided with an inlet, and the lower part of the left sieve cage body 12 and the right sieve cage body 13 are both provided with an outlet; the inside of the cage bottom 11 is longitudinally provided with a conveying roller 14 capable of rotating, the surface of the conveying roller 14 is connected with a plurality of circumferentially arrayed conveying plates 15, and the outside of the cage bottom 11 is fixed with a motor two 16 driving the conveying roller 14 to rotate; the inside of the left sieve cage body 12 and the right sieve cage body 13 are both longitudinally provided with two sieve rollers capable of rotating, each sieve roller is connected with two circumferentially arrayed sieve plates 18, the rear ends of the two sieve rollers are coaxially connected with gear wheels 19 located outside the sieve cage body and meshing with each other, and the front ends of any one of the sieve rollers in the left sieve cage body 12 and the right sieve cage body 13 are driven to rotate by a motor three 20 fixed outside the sieve cage body; the two sieve rollers in the left sieve cage body 12 and the right sieve cage body 13 are synchronously and reversely rotated under the driving of the motor three 20 and the transmission of the gear wheels 19; the minimum distance between the two sieve rollers in the left sieve cage body 12 and the right sieve cage body 13 is the real-time diameter of the respective cage body. The conveying sieve cage 2 of the constant coal feeder 1 adjusts the minimum distance through the two synchronously and reversely rotating sieve rollers, realizes the continuous adjustment of the sieve cage diameter, the whole adjustment process does not need to be disassembled, the single switching time is shorter, and the production line adaptability is higher.
[0039] As shown in Figures 2 to 4 The coal feeder 1 further comprises a plurality of supporting rollers 8 longitudinally rotatably connected above the base 3 and linearly arrayed along the conveying direction of the conveying belt 6; the upper surface of the supporting roller 8 is flush with the upper surface of the driving roller 4 and the driven roller 5; the above can effectively prevent the conveying belt 6 from sagging due to the weight of coal, ensure the stable operation of the conveying belt 6, and avoid material scattering.
[0040] Continuing as Figures 2 to 4As shown, the coal feeder 1 further comprises a tensioning assembly 9 located below the base 3; the tensioning assembly 9 comprises a tensioning roller one 91 rotatably mounted below the base 3, a tensioning roller two 92 rotatably mounted below the base 3, and a tensioning spring 93 pushing the tensioning roller two 92 as a whole downward; the upper surface of the tensioning roller one 91 is in contact with the conveying belt 6, and the lower surface of the tensioning roller two 92 is in contact with the conveying belt 6, which automatically compensates for the slack of the conveying belt 6 through the spring force, maintains constant tension, and prevents slipping. The tensioning assembly 9 further comprises two groups of anti-deviation rollers 94 vertically arranged and rotatably mounted on the base 3, which are respectively located on the front and rear sides of the conveying belt 6 and always limit the conveying belt 6 between the two groups of anti-deviation rollers 94, preventing the conveying belt 6 from causing material jamming, screen cage blockage, or equipment damage due to deviation.
[0041] As shown in Figure 7 , the motor two 16 drives the conveying roller 14 to rotate unidirectionally from the left screen cage body 12 to the right screen cage body 13, wherein the real-time caliber in the left screen cage body 12 is always smaller than the real-time caliber in the right screen cage body 13, forming a gradient screening structure of "pre-screening → fine screening": the left screen cage body 12 separates smaller size coal first, and the right screen cage body 13 further separates larger size coal, thereby screening out smaller size and larger size coal, which can improve the screening efficiency.
[0042] As shown in Figure 7 , the inside of the cage bottom 11 is also fixed with two guide plates 21 located on the left and right sides and inclined downward to the middle, which can concentrate and guide the coal transported by the conveying roller 14 between the adjacent two screening plates 18 of the screening roller, thereby improving the conveying efficiency.
[0043] As shown in Figure 8 , between each adjacent two conveying plates 15, there are multiple reinforcing ribs 22 linearly arrayed along the axial direction of the conveying roller 14, which enhance the structural strength of the conveying plate 15 and prevent deformation or fracture caused by coal impact (especially suitable for large size coal screening scenarios).
[0044] As shown in Figures 8 to 9 , the thickness of the conveying plate 15 and the screening plate 18 gradually increases from the end to the root, forming a structure of "thin end and thick root", which fully improves the impact resistance of the root.
[0045] As shown in Figure 7The working principle of the present application is shown: the motor 7 drives the driving roller 4 to rotate, so that the conveying belt 6 conveys to the cage top 10, the coal on the conveying belt 6 falls into the cage bottom 11 through the cage top 10 entrance under the conveying of the conveying belt 6, the motor 16 drives the conveying roller 14 to rotate unidirectionally from the left screen cage body 12 to the right screen cage body 13, wherein the real-time caliber in the left screen cage body 12 is always smaller than the real-time caliber in the right screen cage body 13, forming a gradient screening structure of “pre-screening→fine screening”: the left screen cage body 12 separates the smaller size coal first, and the right screen cage body 13 further separates the larger size coal, so as to separate the smaller size coal and the larger size coal, which can improve the screening efficiency. When it is necessary to adjust the real-time caliber in the left screen cage body 12 or the right screen cage body 13, the motor 20 drives one of the screening rollers to rotate, under the meshing transmission of the two gears 19, the two screening rollers are synchronously and reversely rotated to adjust the minimum distance, so as to realize the continuous adjustment of the caliber of the screen cage, the whole adjustment process does not need to be disassembled, the single switching time is shorter, and the production line adaptability is higher.
[0046] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A constant coal feeder for real-time coal screening, comprising a coal feeder and a conveying screen cage fixed to the left end of the coal feeder; the coal feeder comprises a base, a driving roller and a driven roller mounted longitudinally on the left and right ends of the base, respectively, a conveyor belt circulating around the driving roller and the driven roller, and a motor fixed to the left end of the base for driving the driving roller; Its characteristics are: The conveying screen cage includes a cage top, a cage bottom fixed below the cage top and connected to the cage top, a left screen cage body fixed to the lower left of the cage bottom and connected to the cage bottom, and a right screen cage body fixed to the lower right of the cage bottom and connected to the cage bottom; an entrance is opened on the side of the cage top, and an outlet is opened below the left and right screen cage bodies; A rotatable conveying roller is longitudinally provided inside the cage bottom, and a plurality of conveying plates distributed in a circumferential array are connected to the surface of the conveying roller. A second motor for driving the conveying roller to rotate is fixed to the outside of the cage bottom; The left and right screen cages are each longitudinally provided with two rotatable screening rollers, each of which is connected to two screening plates distributed in a circumferential array, and the rear ends of the two screening rollers are coaxially connected to gears located outside the screen cage and meshing with each other, and the front ends of any one of the screening rollers in the left and right screen cages are respectively driven to rotate by motors fixed to the outside of the screen cage; The two screening rollers in the left and right screen cages rotate synchronously in opposite directions under the drive of motor 3 and gear transmission; the minimum spacing between the two screening rollers in the left and right screen cages is the real-time caliber of their respective cages.
2. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The second motor drives the conveying roller to rotate unidirectionally from the left screen cage body to the right screen cage body, wherein the real-time caliber in the left screen cage body is always smaller than the real-time caliber in the right screen cage body.
3. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: Two material guide plates are fixed inside the cage bottom and are located on the left and right sides and are inclined downward toward the middle at the same time.
4. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: A plurality of reinforcing ribs distributed in a linear array along the axial direction of the conveying roller are connected between every two adjacent conveying plates.
5. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The number of the conveying plates on the conveying roller is 4-6.
6. The constant coal feeder for real-time coal screening according to any one of claims 1 to 5, characterized in that: The thickness of the conveying plate gradually increases from its end portion to its root portion.
7. The constant coal feeder for real-time coal screening according to any one of claims 1 to 5, characterized in that: The thickness of the sieve plate gradually increases from its end portion to its root portion.
8. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The coal feeder also includes a plurality of supporting rollers which are longitudinally connected to the machine base and arranged in a linear array along the conveying direction of the conveyor belt; the upper surfaces of the supporting rollers are flush with the upper surfaces of the active roller and the driven roller.
9. The constant coal feeder for real-time coal screening according to claim 8, characterized in that: The coal feeder also includes a tensioning assembly located below the machine base; the tensioning assembly includes a tensioning roller 1 rotatably installed below the machine base, a tensioning roller 2 rotatably installed below the machine base, and a tensioning spring that pushes the tensioning roller 2 as a whole downward; the upper surface of the tensioning roller 1 is in contact with the conveyor belt, and the lower surface of the tensioning roller 2 is in contact with the conveyor belt.
10. The constant coal feeder for real-time coal screening according to claim 9, characterized in that: The tensioning assembly also includes two groups of anti-deviation rollers vertically arranged and rotatably mounted on the machine base. The two groups of anti-deviation rollers are respectively located on the front and rear sides of the conveyor belt and always confine the conveyor belt between the two groups of anti-deviation rollers.