A constant coal feeder for real-time screening of coal

Abstract

The application discloses a constant coal feeder for real-time coal screening and belongs to the technical field of coal conveying and screening. The constant coal feeder comprises a coal feeder and a conveying cage top. The conveying cage top comprises a cage top, a cage bottom, a left screening cage body and a right screening cage body. The cage bottom is fixed below the cage top and communicates with the cage top. The left and right screening cage bodies are respectively fixed below the left and right sides of the cage bottom and communicate with the cage bottom. A conveying roller is longitudinally arranged in the cage bottom. The surface of the conveying roller is connected with 4-6 circumferential conveying plates. The conveying roller is driven by a second motor. Two longitudinal screening rollers are arranged in each of the left and right screening cage bodies. Each screening roller is connected with two circumferential screening plates. The rear ends of the two screening rollers are driven by meshing gears. The front ends of the two screening rollers are driven by a third motor. The two screening rollers are synchronously and reversely rotated. The minimum distance between the two screening rollers is the real-time diameter of the cage body. The constant coal feeder for real-time coal screening adjusts the minimum distance between the two synchronously and reversely rotated screening rollers, realizes the continuous adjustment of the diameters of the screening cages, does not need to be disassembled during the whole adjustment process, has shorter single switching time and has higher production line adaptability.

Description

Technical Field

[0001] This invention relates to the field of coal conveying and screening technology, specifically to a constant coal feeder for real-time coal screening. Background Technology

[0002] Screening is a crucial step in coal washing and processing, used to separate coal of different particle sizes to meet the requirements of subsequent processes (such as thermal coal separation and coking coal grading). Currently, most screening equipment uses screens with fixed diameters, whose inner diameter is determined at the factory or during installation. When it is necessary to screen coal of different particle sizes (e.g., switching from 30mm to 50mm), the machine must be stopped, the existing screens disassembled, and replaced with new screens of the corresponding specifications. This operation has the following drawbacks:

[0003] Inefficient: Replacing the screen cage requires multiple steps, such as stopping the machine, removing bolts, and hoisting the new cage. Each changeover takes a long time and seriously affects the continuity of the production line.

[0004] High cost: It is necessary to keep spare parts for various specifications of screen cages, resulting in high inventory and management costs;

[0005] Poor adaptability: For small-batch, multi-specification coal screening needs (such as trial production or customized orders), fixed-diameter screen cages cannot respond quickly, resulting in resource waste. 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 coal screening. By dynamically adjusting the inner diameter of the screen cage through synchronously rotating and reverse-rotating screening rollers, the problem of the existing fixed-diameter screen cages requiring frequent disassembly and replacement and having poor adaptability is solved, thereby realizing rapid screening of coal of various specifications.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A constant coal feeder for real-time coal screening includes a coal feeder and a conveying screen cage fixed to the left end of the coal feeder; the coal feeder includes a base, an active roller and a driven roller that are respectively longitudinally rotatably installed at the left and right ends of the base, a conveyor belt that circulates around the active roller and the driven roller, and a motor fixed to the left end of the base and driving the active roller to rotate.

[0009] The conveying screen cage includes a cage top, a cage bottom fixed below the cage top and communicating with the cage top, a left screen cage body fixed to the lower left of the cage bottom and communicating with the cage bottom, and a right screen cage body fixed to the lower right of the cage bottom and communicating with the cage bottom; an inlet is provided on the side of the cage top, and an outlet is provided at the bottom of both the left and right screen cage bodies.

[0010] The cage bottom has a longitudinally rotatable conveyor roller inside, and multiple circumferentially arrayed feeding plates are connected to the surface of the conveyor roller. A motor that drives the conveyor roller to rotate is fixed outside the cage bottom.

[0011] The left and right screen cages each have two rotatable screening rollers inside. Each screening roller is connected to two screen plates arranged in a circumferential array. The rear ends of the two screening rollers are coaxially connected to gears located outside the screen cage and meshing with each other. The front end of any screening roller in the left and right screen cages is driven by a motor fixed outside the screen cage.

[0012] The two screening rollers inside the left and right screen cages rotate synchronously in opposite directions under the three-drive motor and gear transmission; the minimum distance between the two screening rollers inside the left and right screen cages is the real-time diameter of their respective cages.

[0013] By adopting the above scheme, the conveying screen cage of the constant coal feeder can adjust the minimum gap through two synchronously rotating screen rollers, so as to achieve continuous adjustment of the inner diameter of the screen cage. The entire adjustment process does not require disassembly, the single switching time is shorter, and the production line adaptability is higher.

[0014] As a preferred implementation of a constant coal feeder for real-time coal screening, the motor drives the conveying rollers to rotate unidirectionally from the left screen cage to the right screen cage. The real-time diameter of the left screen cage is always smaller than that of the right screen cage, forming a gradient screening structure of "pre-screening → fine screening": the left screen cage first separates smaller coal particles, and the right screen cage further separates larger coal particles, thereby separating the smaller and larger coal particles and improving screening efficiency.

[0015] As a preferred embodiment of a constant coal feeder for real-time coal screening, the bottom of the cage is also fixed with two guide plates located on the left and right sides and simultaneously tilted and lowered towards the middle. These guide plates can concentrate the coal transported by the conveying rollers between the two adjacent screen plates of the screen rollers, thereby improving the conveying efficiency.

[0016] As a preferred embodiment of a constant coal feeder for real-time coal screening, multiple reinforcing ribs are connected between each pair of adjacent conveyor plates in a linear array along the axial direction of the conveyor rollers to enhance the structural strength of the conveyor plates and prevent deformation or breakage caused by coal impact (especially suitable for large-particle coal screening scenarios).

[0017] As a preferred implementation of a constant coal feeder for real-time coal screening, the thickness of both the conveying plate and the screen plate gradually increases from their ends to their roots, forming a structure that is "thin at the ends and thick at the roots," which fully enhances the impact resistance of the roots.

[0018] As a preferred embodiment of a constant coal feeder for real-time coal screening, the coal feeder also includes multiple longitudinally rotatably connected to the upper part of the machine base and arranged linearly along the conveyor belt conveying direction; the upper surface of the support rollers is flush with the upper surfaces of the driving roller and the driven roller; the above can effectively prevent the conveyor belt from sagging due to the weight of the coal, ensure the smooth operation of the conveyor belt, and avoid material spillage.

[0019] As a preferred embodiment of a constant coal feeder for real-time coal screening, the feeder also includes a tensioning assembly located below the base; the tensioning assembly includes a tensioning roller one rotatably mounted below the base, a tensioning roller two rotatably mounted below the base, and a tensioning spring that pushes the tensioning roller two downwards as a whole; the upper surface of the tensioning roller one abuts against the conveyor belt, and the lower surface of the tensioning roller two abuts against the conveyor belt, and the spring force automatically compensates for the slack of the conveyor belt, maintains constant tension, and prevents slippage.

[0020] As a preferred embodiment of a constant coal feeder for real-time coal screening, the tensioning assembly also includes two sets of anti-deviation rollers that are vertically arranged and rotatably installed on the machine base. The two sets of anti-deviation rollers are located on the front and rear sides of the conveyor belt respectively and keep the conveyor belt between the two sets of anti-deviation rollers at all times to prevent the conveyor belt from running off-center, causing material jamming, screen cage blockage or equipment damage.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. Dynamically adjustable and highly flexible: The conveyor screen cage adjusts the minimum gap through two synchronously rotating screen rollers, realizing continuous adjustment of the inner diameter of the screen cage. The entire adjustment process does not require disassembly, the single switching time is shorter, and the production line adaptability is higher.

[0023] 2. Gradient screening for improved efficiency: The conveyor rollers, in conjunction with the gradient structure of the left and right screen cages ("small inner diameter → large inner diameter"), enable pre-screening and fine screening of coal, thereby separating smaller and larger particles and improving screening efficiency.

[0024] 3. Reinforced structure and high durability: The gradual thickness design of the conveyor plate and screen plate and the configuration of reinforcing ribs effectively reduce the risk of component damage caused by high-density coal impact; the tensioning components and anti-deviation rollers ensure the long-term reliable operation of the conveyor belt.

[0025] 4. Cost savings: There is no need to stock spare parts for multiple specifications of screen cages, reducing inventory costs and downtime for maintenance, which indirectly improves economic efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A three-dimensional structural diagram of a constant coal feeder for real-time coal screening;

[0028] Figure 2 for Figure 1 Three-dimensional structure of the coal feeder Figure 1 ;

[0029] Figure 3 for Figure 1 Three-dimensional structure of the coal feeder Figure 2 ;

[0030] Figure 4 for Figure 1 Internal structure diagram of the coal feeder;

[0031] Figure 5 for Figure 1 Three-dimensional structure of the conveyor screen cage Figure 1 ;

[0032] Figure 6 for Figure 1 Three-dimensional structure of the conveyor screen cage Figure 2 ;

[0033] Figure 7 for Figure 1 Internal structure diagram of the conveyor screen cage;

[0034] Figure 8 This 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] Reference numerals in the attached diagram: 1-Coal feeder; 2-Conveying screen cage; 3-Base; 4-Drive roller; 5-Driven roller; 6-Conveyor belt; 7-Motor 1; 8-Support roller; 9-Tensioning assembly; 91-Tensioning roller 1; 92-Tensioning roller 2; 93-Tensioning spring; 94-Anti-deviation roller; 10-Cage top; 11-Cage bottom; 12-Left screen cage; 13-Right screen cage; 14-Conveying roller; 15-Feeding plate; 16-Motor 2; 17-Screening roller; 18-Screening plate; 19-Gear; 20-Motor 3; 21-Guide plate; 22-Reinforcing rib. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1 to 9 As shown, a constant coal feeder for real-time coal screening includes a coal feeder 1 and a conveying screen cage 2 fixed to the left end of the coal feeder 1. The coal feeder 1 includes a base 3, a drive roller 4 and a driven roller 5 respectively mounted longitudinally on the left and right ends of the base 3, a conveyor belt 6 that circulates around the drive roller 4 and the driven roller 5, and a motor 7 fixed to the left end of the base 3 and driving the drive roller 4 to rotate. The conveying screen cage 2 includes a cage top 10, a cage bottom 11 fixed below and communicating with the cage top 10, a left screen cage body 12 fixed to the lower left of the cage bottom 11 and communicating with the cage bottom 11, and a right screen cage body 13 fixed to the lower right of the cage bottom 11 and communicating with the cage bottom 11. An inlet is opened on the side of the cage top 10, and an outlet is opened below the left screen cage body 12 and the right screen cage body 13. A rotatable conveying roller is arranged longitudinally inside the cage bottom 11. 14. The surface of the conveying roller 14 is connected to multiple circumferentially arrayed conveying plates 15. The outside of the cage bottom 11 is fixed with a motor 2 16 that drives the conveying roller 14 to rotate. The interior of the left screen cage 12 and the right screen cage 13 are each longitudinally provided with two rotatable screening rollers. Each screening roller is connected to two circumferentially arrayed screening plates 18. The rear ends of the two screening rollers are coaxially connected to gears 19 located outside the screen cage and meshing with each other. The front end of any screening roller in the left screen cage 12 and the right screen cage 13 is driven to rotate by a motor 3 20 fixed outside the screen cage. The two screening rollers in the left screen cage 12 and the right screen cage 13 rotate synchronously in opposite directions under the drive of the motor 3 20 and the transmission of the gear 19. The minimum distance between the two screening rollers in the left screen cage 12 and the right screen cage 13 is the real-time diameter of their respective cages. The conveying screen 2 of the constant coal feeder 1 adjusts the minimum spacing through two synchronously rotating screen rollers, so that the inner diameter of the screen cage can be continuously adjusted. The entire adjustment process does not require disassembly, the single switching time is shorter, and the production line adaptability is higher.

[0039] like Figures 2 to 4 As shown, the coal feeder 1 also includes multiple longitudinally rotatably connected to the base 3 and arranged linearly along the conveying direction of the conveyor belt 6. The upper surface of the support roller 8 is flush with the upper surface of the drive roller 4 and the driven roller 5. This can effectively prevent the conveyor belt 6 from sagging due to the weight of the coal, ensure the smooth operation of the conveyor belt 6, and avoid material spillage.

[0040] Continue as Figures 2 to 4As shown, the coal feeder 1 also includes a tensioning assembly 9 located below the base 3. The tensioning assembly 9 includes a tensioning roller 91 rotatably mounted below the base 3, a tensioning roller 92 rotatably mounted below the base 3, and a tensioning spring 93 that pushes the tensioning roller 92 downwards. The upper surface of the tensioning roller 91 abuts against the conveyor belt 6, and the lower surface of the tensioning roller 92 abuts against the conveyor belt 6. The spring force automatically compensates for the slack of the conveyor belt 6, maintaining a constant tension and preventing slippage. The tensioning assembly 9 also includes two sets of anti-deviation rollers 94 vertically arranged and rotatably mounted on the base 3. The two sets of anti-deviation rollers 94 are located on the front and rear sides of the conveyor belt 6 respectively and always confine the conveyor belt 6 between the two sets of anti-deviation rollers 94 to prevent the conveyor belt 6 from running off-center, causing material jamming, screen blockage, or equipment damage.

[0041] like Figure 7 As shown, motor 2 16 drives the conveyor roller 14 to rotate unidirectionally from the left screen cage 12 to the right screen cage 13. The real-time diameter inside the left screen cage 12 is always smaller than the real-time diameter inside the right screen cage 13, forming a gradient screening structure of "pre-screening → fine screening": the left screen cage 12 first separates smaller particles of coal, and the right screen cage 13 further separates larger particles of coal, thereby separating the smaller and larger particles of coal and improving screening efficiency.

[0042] Continue as Figure 7 As shown, inside the cage bottom 11, there are also two guide plates 21 located on the left and right sides and tilted and lowered towards the middle at the same time. These guide plates 21 can concentrate the coal transported by the conveying roller 14 between the two adjacent screen plates 18 of the screen roller, thereby improving the conveying efficiency.

[0043] like Figure 8 As shown, there are also multiple reinforcing ribs 22 arranged linearly along the axial direction of the conveying roller 14 between each two adjacent conveying plates 15, which enhance the structural strength of the conveying plates 15 and prevent deformation or breakage caused by coal impact (especially suitable for large-particle coal screening scenarios).

[0044] like Figures 8 to 9 As shown, the thickness of both the conveying plate 15 and the screen plate 18 gradually increases from their ends to their roots, forming a structure that is "thin at the ends and thick at the roots," which fully enhances the impact resistance of the roots.

[0045] like Figure 7As shown, the working principle of this invention is as follows: Motor 7 drives the active roller 4 to rotate, causing the conveyor belt 6 to transport the coal to the top of the cage 10. The coal on the conveyor belt 6 falls into the bottom of the cage 11 through the inlet of the top of the cage 10. Motor 16 drives the conveyor roller 14 to rotate unidirectionally from the left screen cage 12 to the right screen cage 13. The real-time diameter of the left screen cage 12 is always smaller than the real-time diameter of the right screen cage 13, forming a gradient screening structure of "pre-screening → fine screening". The left screen cage 12 first separates smaller particles of coal, and the right screen cage 13 further separates larger particles of coal, thereby separating the smaller and larger particles of coal and improving the screening efficiency. When it is necessary to adjust the real-time diameter of the left screen cage 12 or the right screen cage 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 rotate synchronously in opposite directions to adjust the minimum gap, thereby realizing the continuous adjustment of the inner diameter of the screen cage. The entire adjustment process does not require disassembly, the single switching time is shorter, and the production line adaptability is higher.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 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, an active roller and a driven roller respectively longitudinally rotatably mounted at the left and right ends of the base, a conveyor belt that circulates around the active roller and the driven roller, and a motor fixed to the left end of the base and driving the active roller to rotate. Its features are: The conveying screen cage includes a cage top, a cage bottom fixed below the cage top and communicating with the cage top, a left screen cage body fixed to the lower left of the cage bottom and communicating with the cage bottom, and a right screen cage body fixed to the lower right of the cage bottom and communicating with the cage bottom; an inlet is provided on the side of the cage top, and an outlet is provided at the bottom of the left and right screen cage bodies. The cage bottom has a longitudinally rotatable conveyor roller inside, and multiple circumferentially arrayed conveyor plates are connected to the surface of the conveyor roller. A motor that drives the conveyor roller to rotate is fixed outside the cage bottom. The left and right screen cages each have two rotatable screening rollers arranged longitudinally inside. Each screening roller is connected to two screen plates arranged in a circumferential array. The rear ends of the two screening rollers are coaxially connected to gears located outside the screen cage and meshing with each other. The front end of any screening roller in the left and right screen cages is driven to rotate by a motor fixed outside the screen cage. The two screening rollers inside the left and right screen cages rotate synchronously in opposite directions under the three-drive motor and gear transmission; the minimum distance between the two screening rollers inside the left and right screen cages is the real-time diameter of their respective cages.

2. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The motor drives the conveyor roller to rotate unidirectionally from the left screen cage to the right screen cage, wherein the real-time diameter inside the left screen cage is always smaller than the real-time diameter inside the right screen cage.

3. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: Inside the cage bottom, there are two guide plates located on the left and right sides, which simultaneously tilt and lower towards the center.

4. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: Between each pair of adjacent conveyor plates, there are multiple reinforcing ribs arranged in a linear array along the axial direction of the conveyor roller.

5. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The number of 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 1-5, characterized in that: The thickness of the feed plate gradually increases from its end to its root.

7. The constant coal feeder for real-time coal screening according to any one of claims 1-5, characterized in that: The thickness of the screen plate gradually increases from its end to its root.

8. The constant coal feeder for real-time coal screening according to claim 1, characterized in that: The coal feeder also includes multiple longitudinally rotatably connected to the upper part of the machine base and arranged linearly along the conveyor belt conveying direction; the upper surface of the support roller is flush with the upper surface of the driving 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 base; the tensioning assembly includes a tensioning roller one rotatably mounted below the base, a tensioning roller two rotatably mounted below the base, and a tensioning spring that pushes the tensioning roller two downward as a whole; the upper surface of the tensioning roller one abuts against the conveyor belt, and the lower surface of the tensioning roller two abuts against 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 sets of anti-deviation rollers that are vertically arranged and rotatably mounted on the machine base. The two sets of anti-deviation rollers are located on the front and rear sides of the conveyor belt respectively and keep the conveyor belt between the two sets of anti-deviation rollers at all times.

Images