Pulverized coal refining device
By designing a coal powder refining device with a rotary screen and a cleaning device, the problem of insufficient self-cleaning ability of the ball mill was solved, the screen holes were cleared and the coal powder particles were smoothly discharged, the risk of equipment failure was reduced, and the structure was simple and the cost was low.
Patent Information
- Application Number
- CN202520388801.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Existing ball mills have poor self-cleaning ability during the coal powder refining process, which leads to screen hole blockage and coal powder particle accumulation in the screen cylinder, increasing rotation resistance and even causing motor overload damage.
A coal powder refining device was designed, which uses a rotary screen cylinder and a cleaning device. The rotation of the rotary screen cylinder drives the grinding balls to move and the material is discharged by a screw conveyor. Combined with the electric push rod-driven steel wire brush, the rotary screen cylinder is cleaned to ensure that the screen holes are unobstructed.
It achieves self-cleaning of the rotary screen cylinder, avoids screen hole clogging, ensures smooth discharge of coal powder particles, reduces equipment failure risk, and has a simple structure and low cost.
Smart Images
Figure CN223931523U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a coal powder refining device. Background Technology
[0002] Coal, as an important energy resource, is widely used in industries such as power generation, metallurgy, and chemicals. To improve coal utilization efficiency and reduce environmental pollution, the refining of pulverized coal has become a crucial step. The particle size of pulverized coal directly affects its combustion efficiency, gasification reaction rate, and the effectiveness of subsequent processes. Therefore, developing efficient and energy-saving pulverized coal refining equipment is of significant practical importance.
[0003] Currently, coal powder refining mainly relies on traditional crushing equipment, with ball mills being the most common coal powder refining equipment.
[0004] However, existing ball mills have poor self-cleaning capabilities, which leads to screen hole blockage, affecting normal screening, and causing coal powder particles to accumulate inside the screen cylinder, increasing the screen cylinder's rotational resistance and even causing motor overload and damage.
[0005] Based on the above problems, we designed a coal powder refining device that can achieve self-cleaning. Utility Model Content
[0006] The technical problem to be solved by this utility model is to provide a coal powder refining device that can achieve self-cleaning.
[0007] To solve the above problems, the present invention adopts the following technical solution:
[0008] A coal powder refining device includes a body and a rotary screen cylinder rotatably installed inside the body. Grinding balls are filled inside the rotary screen cylinder. A discharge device is installed at the bottom of the body, and a feeding device is installed on the left side of the body, the feeding device being inserted into the rotary screen cylinder. A base plate is welded to the bottom of the body, and a drive device for rotating the rotary screen cylinder is installed on the top of the base plate. A cleaning device for cleaning the rotary screen cylinder is installed on the top of the body.
[0009] Preferably, the diameter of the machine body gradually decreases from the middle to both ends, causing the coal powder particles inside the machine body to gather towards the middle of the machine body, and the discharge device is located at the bottom middle position of the machine body.
[0010] Preferably, the discharge device is a screw conveyor.
[0011] Preferably, the feeding device is also a screw conveyor.
[0012] Preferably, the rotary screen cylinder includes a screen cylinder, a side cover welded to the left end of the screen cylinder, a first side cover welded to the right side of the screen cylinder, a rotary tube disposed at the axial center of the side cover, a bearing and a shaft seal fitting between the rotary tube and the machine body, the shaft seal sealing the inner side of the bearing, a drive shaft mounted at the axial center of the first side cover, a first bearing and a first shaft seal fitting between the drive shaft and the machine body, belt drive between the drive shaft and the drive device, the grinding balls located inside the screen cylinder, the feeding device inserted into the rotary tube, a sealing ring provided at the opening of the rotary tube, the distance between the sealing ring and the feeding device being less than 0.5 mm.
[0013] Preferably, the inner radial direction of the rotary tube gradually increases towards the screen cylinder.
[0014] Preferably, the inside of the screen cylinder is welded with multiple reinforcing rings.
[0015] Preferably, the cleaning device includes a sliding plate and an electric push rod. A first bracket and a second bracket are welded to the top of the machine body. A sliding shaft is welded to the top of the sliding plate. The sliding shaft passes through the first bracket and engages with a limiting nut. A spring is sleeved on the sliding shaft, and the spring acts between the limiting nut and the first bracket. The electric push rod is fixedly installed through the second bracket. The telescopic end of the electric push rod passes through the second bracket and acts on the top of the sliding plate. A strip groove is provided on the top of the machine body, and the sliding plate is inserted through the strip groove. An assembly plate is detachably installed on the top of the sliding plate. Steel wire bristles are embedded in the bottom of the assembly plate. As the sliding plate descends, the steel wire bristles act on the rotary screen cylinder.
[0016] Preferably, a sealing strip is glued to the inner wall of the strip groove.
[0017] The beneficial effects of this utility model are:
[0018] This device utilizes the rotation of the rotary screen cylinder to actively contact the cleaning device, thereby cleaning the rotary screen cylinder, ensuring the screen holes are unobstructed, and allowing fine coal powder particles to pass smoothly through the screen holes, avoiding material accumulation. This device has a simple structure, low cost, and is suitable for widespread use. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 This is a sectional view at point A;
[0022] Figure 3 This is a sectional view at point B;
[0023] Figure 4 This is a cross-sectional view of the skateboard. Detailed Implementation
[0024] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.
[0025] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.
[0026] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] See Figure 1 , Figure 2 and Figure 3The pulverized coal refining device shown includes a body 1 and a rotary screen cylinder rotatably installed inside the body 1. Grinding balls 3 are filled inside the rotary screen cylinder. A discharge device 4 is installed at the bottom of the body. A feeding device 5 is installed on the left side of the body 1 and is inserted into the rotary screen cylinder. A base plate 6 is welded to the bottom of the body 1. A drive device 7 for driving the rotary screen cylinder to rotate is installed on the top of the base plate 6. A cleaning device 8 for cleaning the rotary screen cylinder is installed on the top of the body 1.
[0030] In the above technical solution, the rotation of the rotary screen cylinder drives the movement of the grinding balls 3. The coal powder particles conveyed to the rotary screen cylinder by the feeding device 5 are crushed and refined by the rolling grinding balls 3. The coal powder particles with qualified particle size pass through the rotary screen cylinder and are discharged through the discharge device 4.
[0031] The rotary screen cylinder is cleaned by the cleaning device 8 to ensure that the screen holes of the rotary screen cylinder are always unobstructed.
[0032] Preferably, the diameter of the machine body 1 gradually decreases from the middle to both ends, so that the coal powder particles inside the machine body 1 gather towards the middle of the machine body 1, and the discharge device 4 is located at the bottom middle position of the machine body 1.
[0033] In the above technical solution, the specially designed body 1 can gather coal powder particles, which facilitates the export of refined coal powder particles.
[0034] The discharge device 4 is a screw conveyor.
[0035] The feeding device 5 is also a screw conveyor.
[0036] Preferably, the rotary screen cylinder includes a screen cylinder 21, a side cover 22 welded to the left end of the screen cylinder 21, a first side cover welded to the right side of the screen cylinder 21, a rotary tube 23 disposed at the axis of the side cover 22, a bearing 24 and a shaft seal 25 cooperating between the rotary tube 23 and the machine body 1, the shaft seal 25 sealing the inner side of the bearing 24, a drive shaft 26 installed at the axis of the first side cover, a first bearing and a first shaft seal cooperating between the drive shaft 26 and the machine body 1, belt drive between the drive shaft 26 and the drive device 7, the grinding ball 3 located inside the screen cylinder 21, the feeding device 5 inserted into the rotary tube 23, a sealing ring 27 provided at the opening of the rotary tube 23, the distance between the sealing ring 27 and the feeding device 5 being less than 0.5mm.
[0037] In the above technical solution, the feeding device 5 is inserted into the rotary tube 23 to avoid spillage during feeding.
[0038] With belt drive, the belt will slip when the rotational resistance of the screen cylinder 21 is too high, thus protecting the drive device 7 from overload.
[0039] The drive unit 7 is a motor.
[0040] See Figure 2 As shown, the inner radial direction of the rotary tube 23 gradually increases towards the screen cylinder 21.
[0041] This structure can prevent coal powder particles from accumulating inside the rotary tube 23.
[0042] See Figure 3 As shown, multiple reinforcing rings 221 are welded inside the sieve cylinder 21.
[0043] The purpose of reinforcing ring 221 is to increase the structural rigidity of screen cylinder 21 and reduce deformation.
[0044] See Figure 1 and Figure 4 As shown, the cleaning device 8 includes a sliding plate 81 and an electric push rod 82. A first bracket 83 and a second bracket 84 are welded to the top of the body 1. A sliding shaft 85 is welded to the top of the sliding plate 81. The sliding shaft 85 passes through the first bracket 83 and engages with a limiting nut 86. A spring 87 is sleeved on the sliding shaft 85. The spring 87 acts between the limiting nut 86 and the first bracket 83. The electric push rod 82 is fixedly installed through the second bracket 84. The telescopic end of the electric push rod 82 passes through the second bracket 84 and acts on the top of the sliding plate 81. A strip groove 121 is provided on the top of the body 1, and the sliding plate 81 is inserted through the strip groove 121. An assembly plate 881 is detachably installed on the top of the sliding plate 81. Steel wire bristles 882 are embedded in the bottom of the assembly plate 881. As the sliding plate 81 moves downward, the steel wire bristles 882 act on the rotary screen cylinder.
[0045] A sealing strip 131 is glued to the inner wall of the strip groove 121.
[0046] In the above technical solution, when the electric push rod 82 retracts, the spring resets, causing the slide plate 81 to move upward, thus separating the wire brush bristles 882 from the rotary screen cylinder.
[0047] When the rotary screen cylinder needs to be cleaned, the electric push rod 82 is pushed out, causing the slide plate 81 to be pressed down and allowing the wire brush bristles 882 to contact the rotary screen cylinder, thus completing the cleaning of the rotary screen cylinder.
[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A coal powder refining device, characterized in that: The machine includes a body (1) and a rotary screen cylinder rotatably installed inside the body (1). Grinding balls (3) are filled inside the rotary screen cylinder. A discharge device (4) is installed at the bottom of the body. A feeding device (5) is installed on the left side of the body (1). The feeding device (5) is inserted into the rotary screen cylinder. A base plate (6) is welded to the bottom of the body (1). A drive device (7) for driving the rotary screen cylinder to rotate is installed on the top of the base plate (6). A cleaning device (8) for cleaning the rotary screen cylinder is installed on the top of the body (1).
2. The coal powder refining device according to claim 1, characterized in that: The diameter of the machine body (1) gradually decreases from the middle to both ends, causing the coal powder particles inside the machine body (1) to gather towards the middle of the machine body (1). The discharge device (4) is located at the middle position of the bottom of the machine body (1).
3. The coal powder refining device according to claim 2, characterized in that: The discharge device (4) is a screw conveyor.
4. The coal powder refining device according to claim 1, characterized in that: The feeding device (5) is also a screw conveyor.
5. The coal powder refining device according to claim 1, characterized in that: The rotary screen cylinder includes a screen cylinder (21). A side cover (22) is welded to the left end of the screen cylinder (21), and a first side cover is welded to the right side of the screen cylinder (21). A rotary tube (23) is provided at the axial center of the side cover (22). A bearing (24) and a shaft seal (25) are fitted between the rotary tube (23) and the machine body (1). The shaft seal (25) seals the inside of the bearing (24). A drive shaft (26) is installed at the axial center of the first side cover. The transmission shaft (26) and the machine body (1) are fitted with a first bearing and a first shaft seal. The transmission shaft (26) and the drive device (7) are connected by belt drive. The grinding ball (3) is located inside the screen cylinder (21). The feeding device (5) is inserted into the rotary tube (23). A sealing ring (27) is provided at the opening of the rotary tube (23). The distance between the sealing ring (27) and the feeding device (5) is less than 0.5 mm.
6. The coal powder refining device according to claim 5, characterized in that: The inner radial direction of the rotary tube (23) gradually increases towards the screen cylinder (21).
7. The coal powder refining device according to claim 5, characterized in that: The screen cylinder (21) has multiple reinforcing rings (221) welded inside.
8. The coal powder refining device according to claim 1, characterized in that: The cleaning device (8) includes a sliding plate (81) and an electric push rod (82). A first bracket (83) and a second bracket (84) are welded to the top of the body (1). A sliding shaft (85) is welded to the top of the sliding plate (81). The sliding shaft (85) passes through the first bracket (83) and engages with a limiting nut (86). A spring (87) is sleeved on the sliding shaft (85). The spring (87) acts between the limiting nut (86) and the first bracket (83). The electric push rod (82) passes through the first bracket (83). The second bracket (84) is fixedly installed. The telescopic end of the electric push rod (82) passes through the second bracket (84) and acts on the top of the slide plate (81). A strip groove (121) is provided on the top of the machine body (1). The slide plate (81) is inserted through the strip groove (121). An assembly plate (881) is detachably installed on the top of the slide plate (81). A wire brush (882) is implanted at the bottom of the assembly plate (881). As the slide plate (81) moves downward, the wire brush (882) acts on the rotary screen cylinder.
9. The coal powder refining device according to claim 8, characterized in that: A sealing strip (131) is glued to the inner wall of the strip groove (121).