Coal pulverizing and dedusting plant

Abstract

The application discloses a coal grinding and blowing equipment. The application comprises a crushing component, a sleeve coaxially sleeved outside a feeding pipe and rotatably inserted into a coal mill body, a cavity being formed in the sleeve; a grinding ring arranged in a conical barrel and sleeved outside the sleeve; a driving assembly arranged on the coal mill body and connected with the sleeve at one end; and a conveying component arranged at the bottom of the sleeve and communicated with the cavity. When coarse coal moves towards the outlet of the conical barrel, the coarse coal falls onto the guide section and moves towards the grinding gap. At this time, the driving assembly drives the grinding ring to rotate through the sleeve, so that the grinding ring crushes the coarse coal located at the grinding gap. When the coarse coal is crushed to a qualified particle size, the conveying component blows air flow upward from the bottom of the barrel, so that the qualified coal powder is blown out of the coal mill body through the sieve holes, the separation efficiency is improved, and the flow of the coal powder falling into the grinding component is reduced, thereby reducing the grinding energy consumption.

Description

Technical Field

[0001] This invention relates to the field of coal mill technology, and more particularly to a coal mill blowing device. Background Technology

[0002] A coal mill is an important piece of equipment that grinds raw coal to reduce the size of coal particles, increase their surface area, and thus improve the combustion efficiency of coal. It is commonly used in the power industry, metallurgical industry and other fields.

[0003] During operation, the air conveying unit transports the ground coal powder from the coal mill to the separation unit. The separation unit separates the coal powder using the principle of a cyclone separator. Qualified coal powder is blown out of the coal mill with the airflow, while unqualified coal powder falls back into the grinding unit for further crushing under the action of gravity. However, in actual operation, the centrifugal force and airflow generated by the separation unit alone have limited effect on the separation of coal powder. Some qualified coal powder is still difficult to blow out, and the coarse coal falling into the grinding unit will increase its grinding energy consumption.

[0004] Therefore, a coal mill blowing device that can improve the separation efficiency of pulverized coal is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a coal pulverizing equipment that improves the separation efficiency of pulverized coal.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: a coal pulverizing and blowing device, including a crushing component, including a sleeve, which is coaxially sleeved on the outside of the feed pipe and rotatably inserted into the coal mill body, wherein the sleeve has a chamber for conveying airflow;

[0007] A grinding ring is set inside the conical barrel and sleeved on the outer periphery of the sleeve. Multiple sieve holes are evenly distributed on its surface, and a grinding gap is left between the grinding surface and the inner wall of the conical barrel.

[0008] A drive assembly is mounted on the coal mill body, with one end connected to the sleeve, for driving the sleeve to rotate.

[0009] A conveying component, disposed at the bottom of the sleeve and communicating with the chamber, is used to convey airflow upward from the bottom of the cone.

[0010] Furthermore, the cone includes a first fixed section and a second fixed section respectively disposed in the coal mill body, and a crushing section corresponding to the grinding ring is rotatably disposed between the two fixed sections;

[0011] The second fixed section is also provided with a transmission component that is connected to the grinding ring and the crushing section respectively. When the grinding ring rotates, the transmission component drives the crushing section to rotate relative to the rotation direction of the grinding ring.

[0012] Furthermore, the grinding ring is provided with an outer toothed ring at its bottom, and the inner wall of the crushing section is provided with an inner toothed ring;

[0013] The transmission component includes a transmission rod rotatably connected to the second fixed section, and the transmission rod is provided with two first gears that mesh with the outer gear ring and the inner gear ring respectively.

[0014] Furthermore, the sleeve is composed of an external air conveying section connected to the coal mill body and a working section rotatably inserted into the coal mill body, and the inner wall of the air conveying section is fixedly connected to the feed pipe.

[0015] An air inlet is provided on one side of the air conveying section, and the chamber is composed of cavities that are both opened in the air conveying section and the working section and are interconnected.

[0016] The conveying component includes a plurality of air nozzles evenly distributed circumferentially at the bottom of the working section, and each air nozzle is connected to the chamber.

[0017] Furthermore, the grinding ring has a plurality of first protrusions evenly distributed circumferentially;

[0018] The cone barrel is also provided with a cleaning component, including a scraper pivotally connected to the inner wall of the first fixed section, the working surface of which is parallel to the surface of the grinding ring, and a torsion spring is provided at the pivot point of the scraper to apply an upward rotational elastic force to the scraper.

[0019] The scraper has a second protrusion at its top that is adapted to the movement trajectory of the first protrusion. When the first protrusion contacts the second protrusion, the first protrusion applies downward pressure to it.

[0020] Furthermore, a first bevel gear is provided on the extended end of the working section;

[0021] The drive assembly includes a power unit disposed on the top of the coal mill body, and the moving end of the power unit is provided with a second bevel gear that meshes with the first bevel gear.

[0022] The beneficial effects of this invention are reflected in:

[0023] In this invention, when the coarse coal moves towards the outlet of the cone barrel through the operation of the crushing component, it falls onto the guide section and moves towards the grinding gap. At this time, the drive component drives the grinding ring to rotate through the sleeve, thereby causing the grinding ring to further crush the coarse coal located in the grinding gap. After the coarse coal is crushed to a qualified particle size, the conveying component blows air upward from the bottom of the barrel, thereby causing the qualified coal powder to be blown out of the coal mill body through the screen holes, improving the separation efficiency and reducing the flow rate of coal powder falling into the grinding component, thus reducing its grinding energy consumption. Attached Figure Description

[0024] Figure 1 This is a perspective view of the coal pulverizing and blowing equipment described in this invention;

[0025] Figure 2 This is a first cross-sectional view of the coal pulverizing and blowing equipment described in this invention;

[0026] Figure 3 for Figure 2 Enlarged view at point A in the middle;

[0027] Figure 4 This is a second cross-sectional view of the coal pulverizing and blowing equipment described in this invention;

[0028] Figure 5 for Figure 4 A magnified view of point B in the middle.

[0029] In the picture:

[0030] 01. Coal mill body; 011. Conical barrel; 0111. First fixed section; 0112. Second fixed section; 0113. Crushing section; 012. Feed pipe; 1. Crushing component; 11. Sleeve; 111. Chamber; 112. Air conveying section; 113. Working section; 114. Air inlet; 12. Grinding ring; 121. Guide section; 122. Grinding section; 123. Screen hole; 125. First boss; 13. Drive assembly; 131. Power unit; 132. Second bevel gear; 14. External gear ring; 2. Conveying component; 21. Air nozzle; 3. Transmission component; 31. Transmission rod; 32. First gear; 4. Internal gear ring; 5. Cleaning component; 51. Scraper; 52. Second boss; 6. First bevel gear. Detailed Implementation

[0031] 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 a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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.

[0032] Please see Figures 1-5 The present invention discloses a coal pulverizing device, including a crushing component 1, including a sleeve 11, which is coaxially sleeved on the outside of the feed pipe 012 and rotatably inserted into the coal mill body 01. The sleeve 11 has a chamber 111 and communicates with an external gas conveying component (not shown in the figure). The gas conveying component is used to convey airflow into the chamber 111.

[0033] Grinding ring 12 is disposed inside cone barrel 011. Grinding ring 12 consists of guide section 121 which is sleeved on the outside of sleeve 11 and is cone-shaped, and grinding section 122 which is connected to guide section 121 and corresponds to the inner wall of cone barrel 011. A grinding gap is left between the grinding surface of grinding section 122 and the inner wall of cone barrel 011. Grinding ring 12 is used to guide unqualified coal powder (hereinafter referred to as coarse coal) to move towards the grinding gap and crush it.

[0034] The grinding section 122 is also circumferentially distributed with multiple sieve holes 123, and the diameter of each sieve hole 123 corresponds to the qualified coal powder particle size.

[0035] The drive assembly 13 is mounted on the coal mill body 01, with one end connected to the sleeve 11, and is used to drive the sleeve 11 to rotate.

[0036] The conveying component 2 is located at the bottom of the sleeve 11 and communicates with the chamber 111, and is used to convey airflow upward from the bottom of the cone 011.

[0037] In practice, when the coal powder enters the cone 011, the coal powder with qualified particle size is blown out of the coal mill body 01 by the airflow. The coarse coal falls onto the guide surface of the grinding ring 12 under the action of gravity and moves towards the grinding gap through the guide. At this time, the drive component 13 drives the grinding ring 12 to rotate through the sleeve 11, so that the grinding ring 12 crushes the coal powder located in the grinding gap. At the same time, the gas conveying component conveys airflow into the conveying component 2 through the chamber 111, so that the airflow blows upward from the bottom of the cone 011, and blows the coal powder crushed by the grinding ring 12 out of the coal mill body 01 through the screen hole 123.

[0038] In this invention, when the coarse coal moves toward the outlet of the cone 011 through the operation of the crushing component 1, it falls onto the guide section 121 and moves toward the grinding gap. At this time, the drive component 13 drives the grinding ring 12 to rotate through the sleeve 11, thereby causing the grinding ring 12 to further crush the coarse coal located in the grinding gap. After the coarse coal is crushed to a qualified particle size, the conveying component 2 blows air upward from the bottom of the barrel, thereby causing qualified coal powder to be blown out of the coal mill body 01 through the screen holes 123, improving the separation efficiency and reducing the flow rate of coal powder falling into the grinding component, thereby reducing its grinding energy consumption.

[0039] It should be noted that the grinding machine body and the cone barrel 011 are common knowledge to those skilled in the art, so their structure and function will not be described in detail here.

[0040] It should be noted that a conical surface is provided at the connection between the grinding section 122 and the guide section 121 to guide coarse coal into the grinding gap and avoid gap blockage.

[0041] In one embodiment, the cone 011 includes a first fixed section 0111 and a second fixed section 0112 respectively disposed in the coal mill body 01, and a crushing section 0113 corresponding to the grinding ring 12 is rotatably disposed between the two fixed sections;

[0042] The second fixed section 0112 is also provided with a transmission component 3 that is connected to the grinding ring 12 and the crushing section 0113 respectively. When the grinding ring 12 rotates, the transmission component 3 drives the crushing section 0113 to rotate relative to the rotation direction of the grinding ring 12.

[0043] With this design, when the grinding ring 12 rotates, the grinding ring 12 drives the crushing section 0113 to rotate relative to the rotation direction of the grinding ring 12 through the transmission component 3, thereby further improving the crushing efficiency of coal powder in the grinding gap.

[0044] In one embodiment, an outer toothed ring 14 is provided at the bottom of the inclined top of the guide section 121, and the outer toothed ring 14 is coaxially arranged around the sleeve 11. An inner toothed ring 4 is provided on the inner wall of the crushing section 0113.

[0045] The transmission component 3 includes a transmission rod 31 that is vertically arranged on one side of the second fixed section 0112 and rotatably connected thereto. The transmission rod 31 is provided with two first gears 32 that mesh with the outer gear ring 14 and the inner gear ring 4 respectively.

[0046] With this design, when the grinding ring 12 rotates, the outer gear ring 14 meshes with the corresponding first gear 32 and, through the transmission rod 31, meshes with another first gear 32 and the inner gear ring 4, thereby driving the crushing section 0113 to rotate relative to the rotation direction of the grinding ring 12, thus realizing the relative rotation of the crushing section 0113 and the grinding section 122.

[0047] In one embodiment, the sleeve 11 is composed of an external air conveying section 112 connected to the coal mill body 01 and a working section 113 rotatably inserted into the coal mill body 01. The inner wall of the air conveying section 112 is fixedly connected to the feed pipe 012, and the working section 113 is dynamically sealed to the coal mill body 01 and the air conveying section 112 respectively.

[0048] The air supply section 112 has an air inlet 114 on one side that is connected to the air supply component. The chamber 111 is composed of cavities that are opened in both the air supply section 112 and the working section 113 and are interconnected.

[0049] The conveying component 2 includes multiple air nozzles 21 that are circumferentially distributed at the bottom of the working section 113 and communicate with the chamber 111. When the air conveying component delivers airflow into the cavity, the airflow is blown upward from the bottom of the cone 011 through each air nozzle 21.

[0050] With this design, when the coal powder is crushed by the grinding disc and passes through the grinding gap, the air conveying component delivers airflow into the chamber 111 through the air inlet 114. The airflow is blown upward from the bottom of the cone 011 through each air nozzle 21, thereby blowing the crushed qualified coal powder out of the coal mill body 01. At the same time, the driving component drives the working section 113 to rotate, and each air nozzle 21 moves and rotates with it to make the airflow more uniform.

[0051] It should be noted that the height of each air nozzle 21 is lower than the height of the transmission rod 31, so that the airflow can blow away the coal dust attached to the transmission component 3 without interfering with the operation of the transmission rod 31, thereby reducing coal dust adhesion.

[0052] In one embodiment, a plurality of first protrusions 125 are evenly distributed circumferentially on the top edge of the inclined surface of the guide segment 121;

[0053] The cone barrel 011 is also provided with a cleaning component 5, including a scraper 51 pivotally connected to the inner wall of the first fixed section 0111, the working surface of which is parallel to the surface of the guide section 121. The pivot of the scraper 51 is provided with a torsion spring (not shown in the figure) to apply an upward rotational torque to the scraper 51.

[0054] The top of the scraper 51 is also provided with a second protrusion 52 that is adapted to the movement trajectory of the first protrusion 125. When the first protrusion 125 contacts the second protrusion 52, the first protrusion 125 applies a downward rotating squeezing force to the scraper 51.

[0055] With this design, when the grinding ring 12 rotates, each first protrusion rotates together with the grinding ring 12 until the corresponding first protrusion contacts the second protrusion 52 and applies downward squeezing force to it. The scraper 51 rotates downward, and its working surface contacts the surface of the guide section 121 and cleans the screen holes 123, thereby preventing the screen holes 123 from being blocked and scraping the coal powder accumulated on the guide section 121, further improving the guiding efficiency of coal powder.

[0056] It should be noted that multiple scrapers 51 can be circumferentially distributed on the inner wall of the first fixed section 0111. Each scraper 51 is pivotally connected to it and is provided with a torsion spring. The second protrusion 52 on each scraper 51 corresponds to the rotation trajectory of the first protrusion 125, thereby improving the cleaning efficiency of the grinding ring 12.

[0057] In one embodiment, a first bevel gear 6 is provided on the extended end of the working section 113;

[0058] The drive assembly 13 includes a power unit 131 disposed on the top of the coal mill body 01, and a second bevel gear 132 that meshes with the first bevel gear 6 is provided on the moving end of the power unit 131.

[0059] With this design, when it is necessary to crush coarse coal, the power unit 131 drives the second bevel gear 132 to rotate and mesh with the first bevel gear 6, thereby driving the sleeve 11 to rotate.

[0060] It should be noted that the main body 01 of the coal mill may be equipped with a protective cover (not shown in the figure) to protect the drive component 13, so as to reduce the impact of the external environment on the drive component 13.

[0061] Preferably, the power unit 131 can be an electric motor as used in the prior art.

[0062] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0063] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0064] Additionally, "multiple" refers to two or more.

[0065] The above description is merely a preferred embodiment of the present invention and is 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 coal pulverizing and blowing device, characterized in that, include: The crushing component (1) includes a sleeve (11), which is coaxially sleeved outside the feed pipe (012) and rotatably inserted inside the coal mill body (01). The sleeve (11) has a chamber (111) for conveying airflow. The grinding ring (12) is set inside the cone barrel (011) and sleeved on the outer periphery of the sleeve (11). Multiple sieve holes (123) are evenly distributed on its surface in the circumferential direction, and a grinding gap is left between the grinding surface and the inner wall of the cone barrel (011). A drive assembly (13) is mounted on the main body (01) of the coal mill, one end of which is connected to the sleeve (11) for driving the sleeve (11) to rotate. A conveying component (2) is disposed at the bottom of the sleeve (11) and communicates with the chamber (111) for conveying airflow upward from the bottom of the cone (011); The cone (011) includes a first fixed section (0111) and a second fixed section (0112) respectively disposed in the coal mill body (01), and a crushing section (0113) corresponding to the grinding ring (12) is rotatably provided between the two fixed sections; The second fixed section (0112) is also provided with a transmission component (3) that is connected to the grinding ring (12) and the crushing section (0113) respectively. When the grinding ring (12) rotates, the transmission component (3) drives the crushing section (0113) to rotate relative to the rotation direction of the grinding ring (12).

2. The pulverized coal blowing equipment according to claim 1, characterized in that: The grinding ring (12) is provided with an outer toothed ring (14) at the bottom, and the inner wall of the crushing section (0113) is provided with an inner toothed ring (4); The transmission component (3) includes a transmission rod (31) rotatably connected to the second fixed section (0112), and the transmission rod (31) is provided with two first gears (32) that mesh with the outer gear ring (14) and the inner gear ring (4) respectively.

3. The pulverized coal blowing equipment according to claim 1, characterized in that: The sleeve (11) consists of an external air conveying section (112) connected to the coal mill body (01) and a working section (113) rotatably inserted into the coal mill body (01), and the inner wall of the air conveying section (112) is fixedly connected to the feed pipe (012). An air inlet (114) is provided on one side of the air conveying section (112), and the chamber (111) is composed of cavities that are opened in both the air conveying section (112) and the working section (113) and are interconnected. The conveying component (2) includes a plurality of air nozzles (21) evenly distributed around the bottom of the working section (113), and each air nozzle (21) is connected to the chamber (111).

4. The pulverized coal blowing equipment according to claim 1, characterized in that: The grinding ring (12) has a plurality of first protrusions (125) evenly distributed in the circumferential direction; The cone barrel (011) is also provided with a cleaning component (5), including a scraper (51) pivotally connected to the inner wall of the first fixed section (0111), whose working surface is parallel to the surface of the grinding ring (12), and a torsion spring is provided at the pivot point of the scraper (51) to apply an upward rotational elastic force to the scraper (51). The scraper (51) has a second protrusion (52) at its top end that is adapted to the movement trajectory of the first protrusion (125). When the first protrusion (125) contacts the second protrusion (52), the first protrusion (125) applies downward pressure to it.

5. The pulverized coal blowing equipment according to claim 3, characterized in that: The working section (113) is provided with a first bevel gear (6) at its extended end; The drive assembly (13) includes a power unit (131) disposed on the top of the coal mill body (01), and the moving end of the power unit (131) is provided with a second bevel gear (132) that meshes with the first bevel gear (6).

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